def test_cli_driver_changes_args(self):
emitter = HierarchicalEmitter()
emitter.register("process-cli-arg.s3.list-objects", self.serialize_param)
self.session.emitter = emitter
driver = CLIDriver(session=self.session)
driver.main("s3 list-objects --bucket foo".split())
self.assertIn(mock.call.paginate(mock.ANY, bucket="foo-altered!"), self.session.operation.method_calls)
def test_cli_driver_changes_args(self):
emitter = HierarchicalEmitter()
emitter.register('process-cli-arg.s3.list-objects', self.serialize_param)
self.session.emitter = emitter
driver = CLIDriver(session=self.session)
driver.main('s3 list-objects --bucket foo'.split())
self.assertIn(mock.call.paginate(mock.ANY, Bucket='foo-altered!'),
self.session.operation.method_calls)
def test_emitter_can_be_passed_in(self):
events = HierarchicalEmitter()
session = create_session(event_hooks=events)
calls = []
handler = lambda **kwargs: calls.append(kwargs)
events.register('foo', handler)
session.emit('foo')
self.assertEqual(len(calls), 1)
def test_emitter_can_be_passed_in(self):
events = HierarchicalEmitter()
session = create_session(event_hooks=events)
calls = []
handler = lambda **kwargs: calls.append(kwargs)
events.register('foo', handler)
session.emit('foo')
self.assertEqual(len(calls), 1)
class TestStopProcessing(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook1(self, **kwargs):
self.hook_calls.append('hook1')
def hook2(self, **kwargs):
self.hook_calls.append('hook2')
return 'hook2-response'
def hook3(self, **kwargs):
self.hook_calls.append('hook3')
return 'hook3-response'
def test_all_hooks(self):
# Here we register three hooks and sanity check
# that all three would be called by a normal emit.
# This ensures our hook calls are setup properly for
# later tests.
self.emitter.register('foo', self.hook1)
self.emitter.register('foo', self.hook2)
self.emitter.register('foo', self.hook3)
self.emitter.emit('foo')
self.assertEqual(self.hook_calls, ['hook1', 'hook2', 'hook3'])
def test_stop_processing_after_first_response(self):
# Here we register three hooks, but only the first
# two should ever execute.
self.emitter.register('foo', self.hook1)
self.emitter.register('foo', self.hook2)
self.emitter.register('foo', self.hook3)
handler, response = self.emitter.emit_until_response('foo')
self.assertEqual(response, 'hook2-response')
self.assertEqual(self.hook_calls, ['hook1', 'hook2'])
def test_no_responses(self):
# Here we register a handler that will not return a response
# and ensure we get back proper values.
self.emitter.register('foo', self.hook1)
responses = self.emitter.emit('foo')
self.assertEqual(self.hook_calls, ['hook1'])
self.assertEqual(responses, [(self.hook1, None)])
def test_no_handlers(self):
# Here we have no handlers, but still expect a tuple of return
# values.
handler, response = self.emitter.emit_until_response('foo')
self.assertIsNone(handler)
self.assertIsNone(response)
class TestStopProcessing(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook1(self, **kwargs):
self.hook_calls.append('hook1')
def hook2(self, **kwargs):
self.hook_calls.append('hook2')
return 'hook2-response'
def hook3(self, **kwargs):
self.hook_calls.append('hook3')
return 'hook3-response'
def test_all_hooks(self):
# Here we register three hooks and sanity check
# that all three would be called by a normal emit.
# This ensures our hook calls are setup properly for
# later tests.
self.emitter.register('foo', self.hook1)
self.emitter.register('foo', self.hook2)
self.emitter.register('foo', self.hook3)
self.emitter.emit('foo')
self.assertEqual(self.hook_calls, ['hook1', 'hook2', 'hook3'])
def test_stop_processing_after_first_response(self):
# Here we register three hooks, but only the first
# two should ever execute.
self.emitter.register('foo', self.hook1)
self.emitter.register('foo', self.hook2)
self.emitter.register('foo', self.hook3)
handler, response = self.emitter.emit_until_response('foo')
self.assertEqual(response, 'hook2-response')
self.assertEqual(self.hook_calls, ['hook1', 'hook2'])
def test_no_responses(self):
# Here we register a handler that will not return a response
# and ensure we get back proper values.
self.emitter.register('foo', self.hook1)
responses = self.emitter.emit('foo')
self.assertEqual(self.hook_calls, ['hook1'])
self.assertEqual(responses, [(self.hook1, None)])
def test_no_handlers(self):
# Here we have no handlers, but still expect a tuple of return
# values.
handler, response = self.emitter.emit_until_response('foo')
self.assertIsNone(handler)
self.assertIsNone(response)
def getEnvironment(self, profile=None):
"""Return environment variables that should be set for the profile."""
eventHooks = HierarchicalEmitter()
session = Session(event_hooks=eventHooks)
if profile:
session.set_config_variable('profile', profile)
eventHooks.register('session-initialized',
inject_assume_role_provider_cache,
unique_id='inject_assume_role_cred_provider_cache')
session.emit('session-initialized', session=session)
creds = session.get_credentials()
env = {}
def set(key, value):
if value:
env[key] = value
if profile:
set('AWS_PROFILE', profile)
set('AWS_ACCESS_KEY_ID', creds.access_key)
set('AWS_SECRET_ACCESS_KEY', creds.secret_key)
# AWS_SESSION_TOKEN is the ostensibly the standard:
# http://blogs.aws.amazon.com/security/post/Tx3D6U6WSFGOK2H/A-New-and-Standardized-Way-to-Manage-Credentials-in-the-AWS-SDKs
# http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html#cli-environment
set('AWS_SESSION_TOKEN', creds.token)
# ...but boto expects AWS_SECURITY_TOKEN. Set both for compatibility.
# https://github.com/boto/boto/blob/b016c07d834df5bce75141c4b9d2f3d30352e1b8/boto/connection.py#L438
set('AWS_SECURITY_TOKEN', creds.token)
set('AWS_DEFAULT_REGION', session.get_config_variable('region'))
return env
def getEnvironment(self, profile=None):
"""Return environment variables that should be set for the profile."""
eventHooks = HierarchicalEmitter()
session = Session(event_hooks=eventHooks)
if profile:
session.set_config_variable('profile', profile)
eventHooks.register('session-initialized',
inject_assume_role_provider_cache,
unique_id='inject_assume_role_cred_provider_cache')
session.emit('session-initialized', session=session)
creds = session.get_credentials()
env = {}
def set(key, value):
if value:
env[key] = value
set('AWS_ACCESS_KEY_ID', creds.access_key)
set('AWS_SECRET_ACCESS_KEY', creds.secret_key)
# AWS_SESSION_TOKEN is the ostensibly the standard:
# http://blogs.aws.amazon.com/security/post/Tx3D6U6WSFGOK2H/A-New-and-Standardized-Way-to-Manage-Credentials-in-the-AWS-SDKs
# http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html#cli-environment
set('AWS_SESSION_TOKEN', creds.token)
# ...but boto expects AWS_SECURITY_TOKEN. Set both for compatibility.
# https://github.com/boto/boto/blob/b016c07d834df5bce75141c4b9d2f3d30352e1b8/boto/connection.py#L438
set('AWS_SECURITY_TOKEN', creds.token)
set('AWS_DEFAULT_REGION', session.get_config_variable('region'))
return env
class Session(object):
"""
The Session object collects together useful functionality
from `botocore` as well as important data such as configuration
information and credentials into a single, easy-to-use object.
:ivar available_profiles: A list of profiles defined in the config
file associated with this session.
:ivar profile: The current profile.
"""
#: A default dictionary that maps the logical names for session variables
#: to the specific environment variables and configuration file names
#: that contain the values for these variables.
#: When creating a new Session object, you can pass in your own dictionary
#: to remap the logical names or to add new logical names. You can then
#: get the current value for these variables by using the
#: ``get_config_variable`` method of the :class:`botocore.session.Session`
#: class.
#: These form the keys of the dictionary. The values in the dictionary
#: are tuples of (<config_name>, <environment variable>, <default value>,
#: <conversion func>).
#: The conversion func is a function that takes the configuration value
#: as an arugment and returns the converted value. If this value is
#: None, then the configuration value is returned unmodified. This
#: conversion function that be used to type convert config values to
#: values other than the default values of strings.
#: The ``profile`` and ``config_file`` variables should always have a
#: None value for the first entry in the tuple because it doesn't make
#: sense to look inside the config file for the location of the config
#: file or for the default profile to use.
#: The ``config_name`` is the name to look for in the configuration file,
#: the ``env var`` is the OS environment variable (``os.environ``) to
#: use, and ``default_value`` is the value to use if no value is otherwise
#: found.
SESSION_VARIABLES = {
# logical: config_file, env_var, default_value, conversion_func
"profile": (None, ["AWS_DEFAULT_PROFILE", "AWS_PROFILE"], None, None),
"region": ("region", "AWS_DEFAULT_REGION", None, None),
"data_path": ("data_path", "AWS_DATA_PATH", None, None),
"config_file": (None, "AWS_CONFIG_FILE", "~/.aws/config", None),
"ca_bundle": ("ca_bundle", "AWS_CA_BUNDLE", None, None),
# This is the shared credentials file amongst sdks.
"credentials_file": (None, "AWS_SHARED_CREDENTIALS_FILE", "~/.aws/credentials", None),
# These variables only exist in the config file.
# This is the number of seconds until we time out a request to
# the instance metadata service.
"metadata_service_timeout": ("metadata_service_timeout", "AWS_METADATA_SERVICE_TIMEOUT", 1, int),
# This is the number of request attempts we make until we give
# up trying to retrieve data from the instance metadata service.
"metadata_service_num_attempts": ("metadata_service_num_attempts", "AWS_METADATA_SERVICE_NUM_ATTEMPTS", 1, int),
}
#: The default format string to use when configuring the botocore logger.
LOG_FORMAT = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
def __init__(self, session_vars=None, event_hooks=None, include_builtin_handlers=True, profile=None):
"""
Create a new Session object.
:type session_vars: dict
:param session_vars: A dictionary that is used to override some or all
of the environment variables associated with this session. The
key/value pairs defined in this dictionary will override the
corresponding variables defined in ``SESSION_VARIABLES``.
:type event_hooks: BaseEventHooks
:param event_hooks: The event hooks object to use. If one is not
provided, an event hooks object will be automatically created
for you.
:type include_builtin_handlers: bool
:param include_builtin_handlers: Indicates whether or not to
automatically register builtin handlers.
:type profile: str
:param profile: The name of the profile to use for this
session. Note that the profile can only be set when
the session is created.
"""
self.session_var_map = copy.copy(self.SESSION_VARIABLES)
if session_vars:
self.session_var_map.update(session_vars)
if event_hooks is None:
self._events = HierarchicalEmitter()
else:
self._events = event_hooks
if include_builtin_handlers:
self._register_builtin_handlers(self._events)
self.user_agent_name = "Botocore"
self.user_agent_version = __version__
self.user_agent_extra = ""
# The _profile attribute is just used to cache the value
# of the current profile to avoid going through the normal
# config lookup process each access time.
self._profile = None
self._config = None
self._credentials = None
self._profile_map = None
# This is a dict that stores per session specific config variable
# overrides via set_config_variable().
self._session_instance_vars = {}
if profile is not None:
self._session_instance_vars["profile"] = profile
self._components = ComponentLocator()
self._register_components()
def _register_components(self):
self._register_credential_provider()
self._register_data_loader()
self._register_endpoint_resolver()
self._register_event_emitter()
self._register_response_parser_factory()
def _register_event_emitter(self):
self._components.register_component("event_emitter", self._events)
def _register_credential_provider(self):
self._components.lazy_register_component(
"credential_provider", lambda: botocore.credentials.create_credential_resolver(self)
)
def _register_data_loader(self):
self._components.lazy_register_component(
"data_loader", lambda: create_loader(self.get_config_variable("data_path"))
)
def _register_endpoint_resolver(self):
self._components.lazy_register_component(
"endpoint_resolver", lambda: regions.EndpointResolver(self.get_data("_endpoints"))
)
def _register_response_parser_factory(self):
self._components.register_component("response_parser_factory", ResponseParserFactory())
def _register_builtin_handlers(self, events):
for spec in handlers.BUILTIN_HANDLERS:
if len(spec) == 2:
event_name, handler = spec
self.register(event_name, handler)
else:
event_name, handler, register_type = spec
if register_type is handlers.REGISTER_FIRST:
self._events.register_first(event_name, handler)
elif register_type is handlers.REGISTER_LAST:
self._events.register_last(event_name, handler)
@property
def available_profiles(self):
return list(self._build_profile_map().keys())
def _build_profile_map(self):
# This will build the profile map if it has not been created,
# otherwise it will return the cached value. The profile map
# is a list of profile names, to the config values for the profile.
if self._profile_map is None:
self._profile_map = self.full_config["profiles"]
return self._profile_map
@property
def profile(self):
if self._profile is None:
profile = self.get_config_variable("profile")
self._profile = profile
return self._profile
def get_config_variable(self, logical_name, methods=("instance", "env", "config")):
"""
Retrieve the value associated with the specified logical_name
from the environment or the config file. Values found in the
environment variable take precedence of values found in the
config file. If no value can be found, a None will be returned.
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to retrieve. This name will be mapped to the
appropriate environment variable name for this session as
well as the appropriate config file entry.
:type method: tuple
:param method: Defines which methods will be used to find
the variable value. By default, all available methods
are tried but you can limit which methods are used
by supplying a different value to this parameter.
Valid choices are: instance|env|config
:returns: value of variable or None if not defined.
"""
# Handle all the short circuit special cases first.
if logical_name not in self.session_var_map:
return
# Do the actual lookups. We need to handle
# 'instance', 'env', and 'config' locations, in that order.
value = None
var_config = self.session_var_map[logical_name]
if self._found_in_instance_vars(methods, logical_name):
return self._session_instance_vars[logical_name]
elif self._found_in_env(methods, var_config):
value = self._retrieve_from_env(var_config[1], os.environ)
elif self._found_in_config_file(methods, var_config):
value = self.get_scoped_config()[var_config[0]]
if value is None:
value = var_config[2]
if var_config[3] is not None:
value = var_config[3](value)
return value
def _found_in_instance_vars(self, methods, logical_name):
if "instance" in methods:
return logical_name in self._session_instance_vars
return False
def _found_in_env(self, methods, var_config):
return (
"env" in methods
and var_config[1] is not None
and self._retrieve_from_env(var_config[1], os.environ) is not None
)
def _found_in_config_file(self, methods, var_config):
if "config" in methods and var_config[0] is not None:
return var_config[0] in self.get_scoped_config()
return False
def _retrieve_from_env(self, names, environ):
# We need to handle the case where names is either
# a single value or a list of variables.
if not isinstance(names, list):
names = [names]
for name in names:
if name in environ:
return environ[name]
return None
def set_config_variable(self, logical_name, value):
"""Set a configuration variable to a specific value.
By using this method, you can override the normal lookup
process used in ``get_config_variable`` by explicitly setting
a value. Subsequent calls to ``get_config_variable`` will
use the ``value``. This gives you per-session specific
configuration values.
::
>>> # Assume logical name 'foo' maps to env var 'FOO'
>>> os.environ['FOO'] = 'myvalue'
>>> s.get_config_variable('foo')
'myvalue'
>>> s.set_config_variable('foo', 'othervalue')
>>> s.get_config_variable('foo')
'othervalue'
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to set. These are the keys in ``SESSION_VARIABLES``.
:param value: The value to associate with the config variable.
"""
self._session_instance_vars[logical_name] = value
def get_scoped_config(self):
"""
Returns the config values from the config file scoped to the current
profile.
The configuration data is loaded **only** from the config file.
It does not resolve variables based on different locations
(e.g. first from the session instance, then from environment
variables, then from the config file). If you want this lookup
behavior, use the ``get_config_variable`` method instead.
Note that this configuration is specific to a single profile (the
``profile`` session variable).
If the ``profile`` session variable is set and the profile does
not exist in the config file, a ``ProfileNotFound`` exception
will be raised.
:raises: ConfigNotFound, ConfigParseError, ProfileNotFound
:rtype: dict
"""
profile_name = self.get_config_variable("profile")
profile_map = self._build_profile_map()
# If a profile is not explicitly set return the default
# profile config or an empty config dict if we don't have
# a default profile.
if profile_name is None:
return profile_map.get("default", {})
elif profile_name not in profile_map:
# Otherwise if they specified a profile, it has to
# exist (even if it's the default profile) otherwise
# we complain.
raise ProfileNotFound(profile=profile_name)
else:
return profile_map[profile_name]
@property
def full_config(self):
"""Return the parsed config file.
The ``get_config`` method returns the config associated with the
specified profile. This property returns the contents of the
**entire** config file.
:rtype: dict
"""
if self._config is None:
try:
config_file = self.get_config_variable("config_file")
self._config = botocore.config.load_config(config_file)
except ConfigNotFound:
self._config = {"profiles": {}}
try:
# Now we need to inject the profiles from the
# credentials file. We don't actually need the values
# in the creds file, only the profile names so that we
# can validate the user is not referring to a nonexistent
# profile.
cred_file = self.get_config_variable("credentials_file")
cred_profiles = botocore.config.raw_config_parse(cred_file)
for profile in cred_profiles:
cred_vars = cred_profiles[profile]
if profile not in self._config["profiles"]:
self._config["profiles"][profile] = cred_vars
else:
self._config["profiles"][profile].update(cred_vars)
except ConfigNotFound:
pass
return self._config
def set_credentials(self, access_key, secret_key, token=None):
"""
Manually create credentials for this session. If you would
prefer to use botocore without a config file, environment variables,
or IAM roles, you can pass explicit credentials into this
method to establish credentials for this session.
:type access_key: str
:param access_key: The access key part of the credentials.
:type secret_key: str
:param secret_key: The secret key part of the credentials.
:type token: str
:param token: An option session token used by STS session
credentials.
"""
self._credentials = botocore.credentials.Credentials(access_key, secret_key, token)
def get_credentials(self):
"""
Return the :class:`botocore.credential.Credential` object
associated with this session. If the credentials have not
yet been loaded, this will attempt to load them. If they
have already been loaded, this will return the cached
credentials.
"""
if self._credentials is None:
self._credentials = self._components.get_component("credential_provider").load_credentials()
return self._credentials
def user_agent(self):
"""
Return a string suitable for use as a User-Agent header.
The string will be of the form:
<agent_name>/<agent_version> Python/<py_ver> <plat_name>/<plat_ver>
Where:
- agent_name is the value of the `user_agent_name` attribute
of the session object (`Boto` by default).
- agent_version is the value of the `user_agent_version`
attribute of the session object (the botocore version by default).
by default.
- py_ver is the version of the Python interpreter beng used.
- plat_name is the name of the platform (e.g. Darwin)
- plat_ver is the version of the platform
If ``user_agent_extra`` is not empty, then this value will be
appended to the end of the user agent string.
"""
base = "%s/%s Python/%s %s/%s" % (
self.user_agent_name,
self.user_agent_version,
platform.python_version(),
platform.system(),
platform.release(),
)
if self.user_agent_extra:
base += " %s" % self.user_agent_extra
return base
def get_data(self, data_path):
"""
Retrieve the data associated with `data_path`.
:type data_path: str
:param data_path: The path to the data you wish to retrieve.
"""
return self.get_component("data_loader").load_data(data_path)
def get_service_model(self, service_name, api_version=None):
"""Get the service model object.
:type service_name: string
:param service_name: The service name
:type api_version: string
:param api_version: The API version of the service. If none is
provided, then the latest API version will be used.
:rtype: L{botocore.model.ServiceModel}
:return: The botocore service model for the service.
"""
service_description = self.get_service_data(service_name, api_version)
return ServiceModel(service_description, service_name=service_name)
def get_waiter_model(self, service_name, api_version=None):
loader = self.get_component("data_loader")
waiter_config = loader.load_service_model(service_name, "waiters-2", api_version)
return waiter.WaiterModel(waiter_config)
def get_paginator_model(self, service_name, api_version=None):
loader = self.get_component("data_loader")
paginator_config = loader.load_service_model(service_name, "paginators-1", api_version)
return paginate.PaginatorModel(paginator_config)
def get_service_data(self, service_name, api_version=None):
"""
Retrieve the fully merged data associated with a service.
"""
data_path = service_name
service_data = self.get_component("data_loader").load_service_model(
data_path, type_name="service-2", api_version=api_version
)
self._events.emit(
"service-data-loaded.%s" % service_name, service_data=service_data, service_name=service_name, session=self
)
return service_data
def get_available_services(self):
"""
Return a list of names of available services.
"""
return self.get_component("data_loader").list_available_services(type_name="service-2")
def set_debug_logger(self, logger_name="botocore"):
"""
Convenience function to quickly configure full debug output
to go to the console.
"""
self.set_stream_logger(logger_name, logging.DEBUG)
def set_stream_logger(self, logger_name, log_level, stream=None, format_string=None):
"""
Convenience method to configure a stream logger.
:type logger_name: str
:param logger_name: The name of the logger to configure
:type log_level: str
:param log_level: The log level to set for the logger. This
is any param supported by the ``.setLevel()`` method of
a ``Log`` object.
:type stream: file
:param stream: A file like object to log to. If none is provided
then sys.stderr will be used.
:type format_string: str
:param format_string: The format string to use for the log
formatter. If none is provided this will default to
``self.LOG_FORMAT``.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
ch = logging.StreamHandler(stream)
ch.setLevel(log_level)
# create formatter
if format_string is None:
format_string = self.LOG_FORMAT
formatter = logging.Formatter(format_string)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def set_file_logger(self, log_level, path, logger_name="botocore"):
"""
Convenience function to quickly configure any level of logging
to a file.
:type log_level: int
:param log_level: A log level as specified in the `logging` module
:type path: string
:param path: Path to the log file. The file will be created
if it doesn't already exist.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
# create console handler and set level to debug
ch = logging.FileHandler(path)
ch.setLevel(log_level)
# create formatter
formatter = logging.Formatter(self.LOG_FORMAT)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def register(self, event_name, handler, unique_id=None, unique_id_uses_count=False):
"""Register a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to invoke when the event
is emitted. This object must be callable, and must
accept ``**kwargs``. If either of these preconditions are
not met, a ``ValueError`` will be raised.
:type unique_id: str
:param unique_id: An optional identifier to associate with the
registration. A unique_id can only be used once for
the entire session registration (unless it is unregistered).
This can be used to prevent an event handler from being
registered twice.
:param unique_id_uses_count: boolean
:param unique_id_uses_count: Specifies if the event should maintain
a count when a ``unique_id`` is registered and unregisted. The
event can only be completely unregistered once every register call
using the unique id has been matched by an ``unregister`` call.
If ``unique_id`` is specified, subsequent ``register``
calls must use the same value for ``unique_id_uses_count``
as the ``register`` call that first registered the event.
:raises ValueError: If the call to ``register`` uses ``unique_id``
but the value for ``unique_id_uses_count`` differs from the
``unique_id_uses_count`` value declared by the very first
``register`` call for that ``unique_id``.
"""
self._events.register(event_name, handler, unique_id, unique_id_uses_count=unique_id_uses_count)
def unregister(self, event_name, handler=None, unique_id=None, unique_id_uses_count=False):
"""Unregister a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to unregister.
:type unique_id: str
:param unique_id: A unique identifier identifying the callback
to unregister. You can provide either the handler or the
unique_id, you do not have to provide both.
:param unique_id_uses_count: boolean
:param unique_id_uses_count: Specifies if the event should maintain
a count when a ``unique_id`` is registered and unregisted. The
event can only be completely unregistered once every ``register``
call using the ``unique_id`` has been matched by an ``unregister``
call. If the ``unique_id`` is specified, subsequent
``unregister`` calls must use the same value for
``unique_id_uses_count`` as the ``register`` call that first
registered the event.
:raises ValueError: If the call to ``unregister`` uses ``unique_id``
but the value for ``unique_id_uses_count`` differs from the
``unique_id_uses_count`` value declared by the very first
``register`` call for that ``unique_id``.
"""
self._events.unregister(
event_name, handler=handler, unique_id=unique_id, unique_id_uses_count=unique_id_uses_count
)
def emit(self, event_name, **kwargs):
return self._events.emit(event_name, **kwargs)
def emit_first_non_none_response(self, event_name, **kwargs):
responses = self._events.emit(event_name, **kwargs)
return first_non_none_response(responses)
def get_component(self, name):
return self._components.get_component(name)
def register_component(self, name, component):
self._components.register_component(name, component)
def lazy_register_component(self, name, component):
self._components.lazy_register_component(name, component)
def create_client(
self,
service_name,
region_name=None,
api_version=None,
use_ssl=True,
verify=None,
endpoint_url=None,
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None,
config=None,
):
"""Create a botocore client.
:type service_name: string
:param service_name: The name of the service for which a client will
be created. You can use the ``Sesssion.get_available_services()``
method to get a list of all available service names.
:type region_name: string
:param region_name: The name of the region associated with the client.
A client is associated with a single region.
:type api_version: string
:param api_version: The API version to use. By default, botocore will
use the latest API version when creating a client. You only need
to specify this parameter if you want to use a previous API version
of the client.
:type use_ssl: boolean
:param use_ssl: Whether or not to use SSL. By default, SSL is used.
Note that not all services support non-ssl connections.
:type verify: boolean/string
:param verify: Whether or not to verify SSL certificates.
By default SSL certificates are verified. You can provide the
following values:
* False - do not validate SSL certificates. SSL will still be
used (unless use_ssl is False), but SSL certificates
will not be verified.
* path/to/cert/bundle.pem - A filename of the CA cert bundle to
uses. You can specify this argument if you want to use a
different CA cert bundle than the one used by botocore.
:type endpoint_url: string
:param endpoint_url: The complete URL to use for the constructed
client. Normally, botocore will automatically construct the
appropriate URL to use when communicating with a service. You can
specify a complete URL (including the "http/https" scheme) to
override this behavior. If this value is provided, then
``use_ssl`` is ignored.
:type aws_access_key_id: string
:param aws_access_key_id: The access key to use when creating
the client. This is entirely optional, and if not provided,
the credentials configured for the session will automatically
be used. You only need to provide this argument if you want
to override the credentials used for this specific client.
:type aws_secret_access_key: string
:param aws_secret_access_key: The secret key to use when creating
the client. Same semantics as aws_access_key_id above.
:type aws_session_token: string
:param aws_session_token: The session token to use when creating
the client. Same semantics as aws_access_key_id above.
:type config: botocore.client.Config
:param config: Advanced client configuration options. If region_name
is specified in the client config, its value will take precedence
over environment variables and configuration values, but not over
a region_name value passed explicitly to the method.
:rtype: botocore.client.BaseClient
:return: A botocore client instance
"""
if region_name is None:
if config and config.region_name is not None:
region_name = config.region_name
else:
region_name = self.get_config_variable("region")
loader = self.get_component("data_loader")
event_emitter = self.get_component("event_emitter")
response_parser_factory = self.get_component("response_parser_factory")
if aws_secret_access_key is not None:
credentials = botocore.credentials.Credentials(
access_key=aws_access_key_id, secret_key=aws_secret_access_key, token=aws_session_token
)
else:
credentials = self.get_credentials()
endpoint_resolver = self.get_component("endpoint_resolver")
client_creator = botocore.client.ClientCreator(
loader,
endpoint_resolver,
self.user_agent(),
event_emitter,
retryhandler,
translate,
response_parser_factory,
)
client = client_creator.create_client(
service_name,
region_name,
use_ssl,
endpoint_url,
verify,
credentials,
scoped_config=self.get_scoped_config(),
client_config=config,
api_version=api_version,
)
return client
class TestHierarchicalEventEmitter(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook(self, **kwargs):
self.hook_calls.append(kwargs)
def test_non_dot_behavior(self):
self.emitter.register('no-dot', self.hook)
self.emitter.emit('no-dot')
self.assertEqual(len(self.hook_calls), 1)
def test_with_dots(self):
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
def test_catch_all_hook(self):
self.emitter.register('foo', self.hook)
self.emitter.register('foo.bar', self.hook)
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 3, self.hook_calls)
# The hook is called with the same event name three times.
self.assertEqual([e['event_name'] for e in self.hook_calls],
['foo.bar.baz', 'foo.bar.baz', 'foo.bar.baz'])
def test_hook_called_in_proper_order(self):
# We should call the hooks from most specific to least
# specific.
calls = []
self.emitter.register('foo', lambda **kwargs: calls.append('foo'))
self.emitter.register('foo.bar',
lambda **kwargs: calls.append('foo.bar'))
self.emitter.register('foo.bar.baz',
lambda **kwargs: calls.append('foo.bar.baz'))
self.emitter.emit('foo.bar.baz')
self.assertEqual(calls, ['foo.bar.baz', 'foo.bar', 'foo'])
class TestWildcardHandlers(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook(self, **kwargs):
self.hook_calls.append(kwargs)
def register(self, event_name):
func = partial(self.hook, registered_with=event_name)
self.emitter.register(event_name, func)
return func
def assert_hook_is_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after > starting:
self.fail("Handler was not called for event: %s" % event)
self.assertEqual(self.hook_calls[-1]['event_name'], event)
def assert_hook_is_not_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after == starting:
self.fail("Handler was called for event but was not "
"suppose to be called: %s, last_event: %s" %
(event, self.hook_calls[-1]))
def test_one_level_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
# Also register for a number of other events to check
# for false positives.
self.emitter.register('other.bar.baz', self.hook)
self.emitter.register('qqq.baz', self.hook)
self.emitter.register('dont.call.me', self.hook)
self.emitter.register('dont', self.hook)
# These calls should trigger our hook.
self.assert_hook_is_called_given_event('foo.bar.baz')
self.assert_hook_is_called_given_event('foo.qux.baz')
self.assert_hook_is_called_given_event('foo.anything.baz')
# These calls should not match our hook.
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('bar.qux.baz')
self.assert_hook_is_not_called_given_event('foo-bar')
def test_hierarchical_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_called_given_event('foo.bar.baz.qux.foo')
self.assert_hook_is_called_given_event('foo.qux.baz.qux')
self.assert_hook_is_called_given_event('foo.qux.baz.qux.foo')
self.assert_hook_is_not_called_given_event('bar.qux.baz.foo')
def test_multiple_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.ANY.THING.baz')
self.assert_hook_is_called_given_event('foo.AT.ALL.baz')
# More specific than what we registered for.
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra')
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra.stuff')
# Too short:
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
# Bad ending segment.
self.assert_hook_is_not_called_given_event('foo.ANY.THING.notbaz')
self.assert_hook_is_not_called_given_event('foo.ANY.THING.stillnotbaz')
def test_can_unregister_for_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
# Call multiple times to verify caching behavior.
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
def test_unregister_does_not_exist(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_cache_cleared_properly(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.bar', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_complicated_register_unregister(self):
r = self.emitter.register
u = partial(self.emitter.unregister, handler=self.hook)
r('foo.bar.baz.qux', self.hook)
r('foo.bar.baz', self.hook)
r('foo.bar', self.hook)
r('foo', self.hook)
u('foo.bar.baz')
u('foo')
u('foo.bar')
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo')
def test_register_multiple_handlers_for_same_event(self):
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
def test_register_with_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# Since we're using the same unique_id, this registration is ignored.
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# This also works across event names, so this registration is ignored
# as well.
self.emitter.register('foo.other', self.hook, unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.emit('foo.other')
self.assertEqual(len(self.hook_calls), 0)
def test_remove_handler_with_unique_id(self):
hook2 = lambda **kwargs: self.hook_calls.append(kwargs)
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
# Reset the hook calls.
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
# Can provide the unique_id to unregister.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
# Same as with not specifying a unique_id, you can call
# unregister multiple times and not get an exception.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
def test_remove_handler_with_and_without_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
def test_register_with_uses_count_initially(self):
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Subsequent calls must set ``unique_id_uses_count`` to True.
with self.assertRaises(ValueError):
self.emitter.register('foo', self.hook, unique_id='foo')
def test_register_with_uses_count_not_initially(self):
self.emitter.register('foo', self.hook, unique_id='foo')
# Subsequent calls must set ``unique_id_uses_count`` to False.
with self.assertRaises(ValueError):
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
def test_register_with_uses_count_unregister(self):
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Event was registered to use a count so it must be specified
# that a count is used when unregistering
with self.assertRaises(ValueError):
self.emitter.unregister('foo', self.hook, unique_id='foo')
# Event should not have been unregistered.
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 1)
self.emitter.unregister('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Event still should not be unregistered.
self.hook_calls = []
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 1)
self.emitter.unregister('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Now the event should be unregistered.
self.hook_calls = []
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 0)
def test_register_with_no_uses_count_unregister(self):
self.emitter.register('foo', self.hook, unique_id='foo')
# The event was not registered to use a count initially
with self.assertRaises(ValueError):
self.emitter.unregister('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
def test_handlers_called_in_order(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register('foo', partial(handler, call_number=1))
self.emitter.register('foo', partial(handler, call_number=2))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2])
def test_handler_call_order_with_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
# We go from most specific to least specific, and each level is called
# in the order they were registered for that particular hierarchy
# level.
self.emitter.register('foo.bar.baz', partial(handler, call_number=1))
self.emitter.register('foo.bar', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.register('foo.bar.baz', partial(handler, call_number=2))
self.emitter.register('foo.bar', partial(handler, call_number=4))
self.emitter.register('foo', partial(handler, call_number=6))
self.emitter.emit('foo.bar.baz')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5, 6])
def test_register_first_single_level(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
# Handlers registered through register_first() are always called
# before handlers registered with register().
self.emitter.register('foo', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=4))
self.emitter.register_first('foo', partial(handler, call_number=1))
self.emitter.register_first('foo', partial(handler, call_number=2))
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5])
def test_register_first_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.register('foo.bar', partial(handler, call_number=2))
self.emitter.register_first('foo', partial(handler, call_number=4))
self.emitter.register_first('foo.bar', partial(handler, call_number=1))
self.emitter.register('foo', partial(handler, call_number=6))
self.emitter.register('foo.bar', partial(handler, call_number=3))
self.emitter.emit('foo.bar')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5, 6])
def test_register_last_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register_last('foo', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=2))
self.emitter.register_first('foo', partial(handler, call_number=1))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3])
def test_register_unregister_first_last(self):
self.emitter.register('foo', self.hook)
self.emitter.register_last('foo.bar', self.hook)
self.emitter.register_first('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar', self.hook)
self.emitter.unregister('foo', self.hook)
self.emitter.emit('foo')
self.assertEqual(self.hook_calls, [])
def test_copy_emitter(self):
# Here we're not testing copy directly, we're testing
# the observable behavior from copying an event emitter.
first = []
def first_handler(id_name, **kwargs):
first.append(id_name)
second = []
def second_handler(id_name, **kwargs):
second.append(id_name)
self.emitter.register('foo.bar.baz', first_handler)
# First time we emit, only the first handler should be called.
self.emitter.emit('foo.bar.baz', id_name='first-time')
self.assertEqual(first, ['first-time'])
self.assertEqual(second, [])
copied_emitter = copy.copy(self.emitter)
# If we emit from the copied emitter, we should still
# only see the first handler called.
copied_emitter.emit('foo.bar.baz', id_name='second-time')
self.assertEqual(first, ['first-time', 'second-time'])
self.assertEqual(second, [])
# However, if we register an event handler with the copied
# emitter, the first emitter will not see this.
copied_emitter.register('foo.bar.baz', second_handler)
copied_emitter.emit('foo.bar.baz', id_name='third-time')
self.assertEqual(first, ['first-time', 'second-time', 'third-time'])
# And now the second handler is called.
self.assertEqual(second, ['third-time'])
# And vice-versa, emitting from the original emitter
# will not trigger the second_handler.
# We'll double check this by unregistering/re-registering
# the event handler.
self.emitter.unregister('foo.bar.baz', first_handler)
self.emitter.register('foo.bar.baz', first_handler)
self.emitter.emit('foo.bar.baz', id_name='last-time')
self.assertEqual(second, ['third-time'])
def test_copy_emitter_with_unique_id_event(self):
# Here we're not testing copy directly, we're testing
# the observable behavior from copying an event emitter.
first = []
def first_handler(id_name, **kwargs):
first.append(id_name)
second = []
def second_handler(id_name, **kwargs):
second.append(id_name)
self.emitter.register('foo', first_handler, 'bar')
self.emitter.emit('foo', id_name='first-time')
self.assertEqual(first, ['first-time'])
self.assertEqual(second, [])
copied_emitter = copy.copy(self.emitter)
# If we register an event handler with the copied
# emitter, the event should not get registered again
# because the unique id was already used.
copied_emitter.register('foo', second_handler, 'bar')
copied_emitter.emit('foo', id_name='second-time')
self.assertEqual(first, ['first-time', 'second-time'])
self.assertEqual(second, [])
# If we unregister the first event from the copied emitter,
# We should be able to register the second handler.
copied_emitter.unregister('foo', first_handler, 'bar')
copied_emitter.register('foo', second_handler, 'bar')
copied_emitter.emit('foo', id_name='third-time')
self.assertEqual(first, ['first-time', 'second-time'])
self.assertEqual(second, ['third-time'])
# The original event emitter should have the unique id event still
# registered though.
self.emitter.emit('foo', id_name='fourth-time')
self.assertEqual(first, ['first-time', 'second-time', 'fourth-time'])
self.assertEqual(second, ['third-time'])
def test_copy_events_with_partials(self):
# There's a bug in python2.6 where you can't deepcopy
# a partial object. We want to ensure that doesn't
# break when a partial is hooked up as an event handler.
def handler(a, b, **kwargs):
return b
f = functools.partial(handler, 1)
self.emitter.register('a.b', f)
copied = copy.copy(self.emitter)
self.assertEqual(copied.emit_until_response(
'a.b', b='return-val')[1], 'return-val')
class Session(object):
"""
The Session object collects together useful functionality
from `botocore` as well as important data such as configuration
information and credentials into a single, easy-to-use object.
:ivar available_profiles: A list of profiles defined in the config
file associated with this session.
:ivar profile: The current profile.
"""
AllEvents = {
'after-call': '.%s.%s',
'after-parsed': '.%s.%s.%s.%s',
'before-parameter-build': '.%s.%s',
'before-call': '.%s.%s',
'service-created': '',
'creating-endpoint': '.%s',
'before-auth': '.%s',
'needs-retry': '.%s.%s',
}
"""
A dictionary where each key is an event name and the value
is the formatting string used to construct a new event.
"""
SessionVariables = {
# logical: config_file, env_var, default_value
'profile': (None, 'BOTO_DEFAULT_PROFILE', None),
'region': ('region', 'BOTO_DEFAULT_REGION', None),
'data_path': ('data_path', 'BOTO_DATA_PATH', None),
'config_file': (None, 'AWS_CONFIG_FILE', '~/.aws/config'),
'access_key': ('aws_access_key_id', 'AWS_ACCESS_KEY_ID', None),
'secret_key': ('aws_secret_access_key', 'AWS_SECRET_ACCESS_KEY', None),
'token': ('aws_security_token', 'AWS_SECURITY_TOKEN', None),
'provider': ('provider', 'BOTO_PROVIDER_NAME', 'aws'),
# These variables only exist in the config file.
# This is the number of seconds until we time out a request to
# the instance metadata service.
'metadata_service_timeout': ('metadata_service_timeout', None, None),
# This is the number of request attempts we make until we give
# up trying to retrieve data from the instance metadata service.
'metadata_service_num_attempts':
('metadata_service_num_attempts', None, None),
}
"""
A default dictionary that maps the logical names for session variables
to the specific environment variables and configuration file names
that contain the values for these variables.
When creating a new Session object, you can pass in your own dictionary to
remap the logical names or to add new logical names. You can then get the
current value for these variables by using the ``get_config_variable``
method of the :class:`botocore.session.Session` class.
The default set of logical variable names are:
* profile - Default profile name you want to use.
* region - Default region name to use, if not otherwise specified.
* data_path - Additional directories to search for data files.
* config_file - Location of a Boto config file.
* access_key - The AWS access key part of your credentials.
* secret_key - The AWS secret key part of your credentials.
* token - The security token part of your credentials (session tokens only)
* provider - The name of the service provider (e.g. aws)
These form the keys of the dictionary. The values in the dictionary
are tuples of (<config_name>, <environment variable>, <default value).
The ``profile`` and ``config_file`` variables should always have a
None value for the first entry in the tuple because it doesn't make
sense to look inside the config file for the location of the config
file or for the default profile to use.
The ``config_name`` is the name to look for in the configuration file,
the ``env var`` is the OS environment variable (``os.environ``) to
use, and ``default_value`` is the value to use if no value is otherwise
found.
"""
FmtString = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
def __init__(self,
session_vars=None,
event_hooks=None,
include_builtin_handlers=True):
"""
Create a new Session object.
:type session_vars: dict
:param session_vars: A dictionary that is used to override some or all
of the environment variables associated with this session. The
key/value pairs defined in this dictionary will override the
corresponding variables defined in ``SessionVariables``.
:type event_hooks: BaseEventHooks
:param event_hooks: The event hooks object to use. If one is not
provided, an event hooks object will be automatically created
for you.
:type include_builtin_handlers: bool
:param include_builtin_handlers: Indicates whether or not to
automatically register builtin handlers.
"""
self.session_var_map = copy.copy(self.SessionVariables)
if session_vars:
self.session_var_map.update(session_vars)
if event_hooks is None:
self._events = HierarchicalEmitter()
else:
self._events = event_hooks
if include_builtin_handlers:
self._register_builtin_handlers(self._events)
self.user_agent_name = 'Botocore'
self.user_agent_version = __version__
self._profile = None
self._config = None
self._credentials = None
self._profile_map = None
self._provider = None
# This is a dict that stores per session specific config variable
# overrides via set_config_variable().
self._session_instance_vars = {}
def _register_builtin_handlers(self, events):
for event_name, handler in handlers.BUILTIN_HANDLERS:
self.register(event_name, handler)
@property
def provider(self):
if self._provider is None:
self._provider = get_provider(self,
self.get_config_variable('provider'))
return self._provider
@property
def available_profiles(self):
return list(self._build_profile_map().keys())
def _build_profile_map(self):
# This will build the profile map if it has not been created,
# otherwise it will return the cached value. The profile map
# is a list of profile names, to the config values for the profile.
if self._profile_map is None:
profile_map = {}
for key, values in self.full_config.items():
if key.startswith("profile"):
try:
parts = shlex.split(key)
except ValueError:
continue
if len(parts) == 2:
profile_map[parts[1]] = values
elif key == 'default':
# default section is special and is considered a profile
# name but we don't require you use 'profile "default"'
# as a section.
profile_map[key] = values
self._profile_map = profile_map
return self._profile_map
@property
def profile(self):
return self._profile
@profile.setter
def profile(self, profile):
# Since provider can be specified in profile, changing the
# profile should reset the provider.
self._provider = None
self._profile = profile
def get_config_variable(self,
logical_name,
methods=('instance', 'env', 'config'),
default=None):
"""
Retrieve the value associated with the specified logical_name
from the environment or the config file. Values found in the
environment variable take precedence of values found in the
config file. If no value can be found, a None will be returned.
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to retrieve. This name will be mapped to the
appropriate environment variable name for this session as
well as the appropriate config file entry.
:type method: tuple
:param method: Defines which methods will be used to find
the variable value. By default, all available methods
are tried but you can limit which methods are used
by supplying a different value to this parameter.
Valid choices are: instance|env|config
:param default: The default value to return if there is no
value associated with the config file. This value will
override any default value specified in ``SessionVariables``.
:returns: str value of variable of None if not defined.
"""
value = None
# There's two types of defaults here. One if the
# default value specified in the SessionVariables.
# The second is an explicit default value passed into this
# function (the default parameter).
# config_default is tracking the default value specified
# in the SessionVariables.
config_default = None
if logical_name in self.session_var_map:
# Short circuit case, check if the var has been explicitly
# overriden via set_config_variable.
if 'instance' in methods and \
logical_name in self._session_instance_vars:
return self._session_instance_vars[logical_name]
config_name, envvar_name, config_default = self.session_var_map[
logical_name]
if logical_name in ('config_file', 'profile'):
config_name = None
if logical_name == 'profile' and self._profile:
value = self._profile
elif 'env' in methods and envvar_name and envvar_name in os.environ:
value = os.environ[envvar_name]
elif 'config' in methods:
if config_name:
config = self.get_config()
value = config.get(config_name)
# If we don't have a value at this point, we need to try to assign
# a default value. An explicit default argument will win over the
# default value from SessionVariables.
if value is None and default is not None:
value = default
if value is None and config_default is not None:
value = config_default
return value
# Alias to get_variable for backwards compatability.
get_variable = get_config_variable
def set_config_variable(self, logical_name, value):
"""Set a configuration variable to a specific value.
By using this method, you can override the normal lookup
process used in ``get_config_variable`` by explicitly setting
a value. Subsequent calls to ``get_config_variable`` will
use the ``value``. This gives you per-session specific
configuration values.
::
>>> # Assume logical name 'foo' maps to env var 'FOO'
>>> os.environ['FOO'] = 'myvalue'
>>> s.get_config_variable('foo')
'myvalue'
>>> s.set_config_variable('foo', 'othervalue')
>>> s.get_config_variable('foo')
'othervalue'
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to set. These are the keys in ``SessionVariables``.
:param value: The value to associate with the config variable.
"""
self._session_instance_vars[logical_name] = value
def get_config(self):
"""
Returns the configuration associated with this session. If
the configuration has not yet been loaded, it will be loaded
using the default ``profile`` session variable. If it has already been
loaded, the cached configuration will be returned.
Note that this configuration is specific to a single profile (the
``profile`` session variable).
If the ``profile`` session variable is set and the profile does
not exist in the config file, a ``ProfileNotFound`` exception
will be raised.
:raises: ConfigNotFound, ConfigParseError, ProfileNotFound
:rtype: dict
"""
profile_name = self.get_config_variable('profile')
profile_map = self._build_profile_map()
# If a profile is not explicitly set return the default
# profile config or an empty config dict if we don't have
# a default profile.
if profile_name is None:
return profile_map.get('default', {})
elif profile_name not in profile_map:
# Otherwise if they specified a profile, it has to
# exist (even if it's the default profile) otherwise
# we complain.
raise ProfileNotFound(profile=profile_name)
else:
return profile_map[profile_name]
@property
def full_config(self):
"""Return the parsed config file.
The ``get_config`` method returns the config associated with the
specified profile. This property returns the contents of the
**entire** config file.
:rtype: dict
"""
if self._config is None:
try:
self._config = botocore.config.get_config(self)
except ConfigNotFound:
self._config = {}
return self._config
def set_credentials(self, access_key, secret_key, token=None):
"""
Manually create credentials for this session. If you would
prefer to use botocore without a config file, environment variables,
or IAM roles, you can pass explicit credentials into this
method to establish credentials for this session.
:type access_key: str
:param access_key: The access key part of the credentials.
:type secret_key: str
:param secret_key: The secret key part of the credentials.
:type token: str
:param token: An option session token used by STS session
credentials.
"""
self._credentials = botocore.credentials.Credentials(
access_key, secret_key, token)
self._credentials.method = 'explicit'
def get_credentials(self):
"""
Return the :class:`botocore.credential.Credential` object
associated with this session. If the credentials have not
yet been loaded, this will attempt to load them. If they
have already been loaded, this will return the cached
credentials.
"""
if self._credentials is None:
self._credentials = botocore.credentials.get_credentials(self)
return self._credentials
def user_agent(self):
"""
Return a string suitable for use as a User-Agent header.
The string will be of the form:
<agent_name>/<agent_version> Python/<py_ver> <plat_name>/<plat_ver>
Where:
- agent_name is the value of the `user_agent_name` attribute
of the session object (`Boto` by default).
- agent_version is the value of the `user_agent_version`
attribute of the session object (the botocore version by default).
by default.
- py_ver is the version of the Python interpreter beng used.
- plat_name is the name of the platform (e.g. Darwin)
- plat_ver is the version of the platform
"""
return '%s/%s Python/%s %s/%s' % (
self.user_agent_name, self.user_agent_version,
platform.python_version(), platform.system(), platform.release())
def get_data(self, data_path):
"""
Retrieve the data associated with `data_path`.
:type data_path: str
:param data_path: The path to the data you wish to retrieve.
"""
return botocore.base.get_data(self, data_path)
def get_service_data(self, service_name):
"""
Retrieve the fully merged data associated with a service.
"""
data_path = '%s/%s' % (self.provider.name, service_name)
service_data = self.get_data(data_path)
return service_data
def get_available_services(self):
"""
Return a list of names of available services.
"""
data_path = '%s' % self.provider.name
return self.get_data(data_path)
def get_service(self, service_name):
"""
Get information about a service.
:type service_name: str
:param service_name: The name of the service (e.g. 'ec2')
:returns: :class:`botocore.service.Service`
"""
service = botocore.service.get_service(self, service_name,
self.provider)
event = self.create_event('service-created')
self._events.emit(event, service=service)
return service
def set_debug_logger(self, logger_name='botocore'):
"""
Convenience function to quickly configure full debug output
to go to the console.
"""
self.set_stream_logger(logger_name, logging.DEBUG)
def set_stream_logger(self,
logger_name,
log_level,
stream=None,
format_string=None):
"""
Convenience method to configure a stream logger.
:type logger_name: str
:param logger_name: The name of the logger to configure
:type log_level: str
:param log_level: The log level to set for the logger. This
is any param supported by the ``.setLevel()`` method of
a ``Log`` object.
:type stream: file
:param stream: A file like object to log to. If none is provided
then sys.stderr will be used.
:type format_string: str
:param format_string: The format string to use for the log
formatter. If none is provided this will default to
``self.FmtString``.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
ch = logging.StreamHandler(stream)
ch.setLevel(log_level)
# create formatter
if format_string is None:
format_string = self.FmtString
formatter = logging.Formatter(format_string)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def set_file_logger(self, log_level, path, logger_name='botocore'):
"""
Convenience function to quickly configure any level of logging
to a file.
:type log_level: int
:param log_level: A log level as specified in the `logging` module
:type path: string
:param path: Path to the log file. The file will be created
if it doesn't already exist.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
# create console handler and set level to debug
ch = logging.FileHandler(path)
ch.setLevel(log_level)
# create formatter
formatter = logging.Formatter(self.FmtString)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def register(self, event_name, handler, unique_id=None):
"""Register a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to invoke when the event
is emitted. This object must be callable, and must
accept ``**kwargs``. If either of these preconditions are
not met, a ``ValueError`` will be raised.
:type unique_id: str
:param unique_id: An optional identifier to associate with the
registration. A unique_id can only be used once for
the entire session registration (unless it is unregistered).
This can be used to prevent an event handler from being
registered twice.
"""
self._events.register(event_name, handler, unique_id)
def unregister(self, event_name, handler=None, unique_id=None):
"""Unregister a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to unregister.
:type unique_id: str
:param unique_id: A unique identifier identifying the callback
to unregister. You can provide either the handler or the
unique_id, you do not have to provide both.
"""
self._events.unregister(event_name,
handler=handler,
unique_id=unique_id)
def register_event(self, event_name, fmtstr):
"""
Register a new event. The event will be added to ``AllEvents``
and will then be able to be created using ``create_event``.
:type event_name: str
:param event_name: The base name of the event.
:type fmtstr: str
:param fmtstr: The formatting string for the event.
"""
if event_name not in self.AllEvents:
self.AllEvents[event_name] = fmtstr
def create_event(self, event_name, *fmtargs):
"""
Creates a new event string that can then be emitted.
You could just create it manually, since it's just
a string but this helps to define the range of known events.
:type event_name: str
:param event_name: The base name of the new event.
:type fmtargs: tuple
:param fmtargs: A tuple of values that will be used as the
arguments pass to the string formatting operation. The
actual values passed depend on the type of event you
are creating.
"""
if event_name in self.AllEvents:
fmt_string = self.AllEvents[event_name]
if fmt_string:
event = event_name + (fmt_string % fmtargs)
else:
event = event_name
return event
raise EventNotFound(event_name=event_name)
def emit(self, event_name, **kwargs):
return self._events.emit(event_name, **kwargs)
def emit_first_non_none_response(self, event_name, **kwargs):
responses = self._events.emit(event_name, **kwargs)
return first_non_none_response(responses)
class TestWildcardHandlers(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook(self, **kwargs):
self.hook_calls.append(kwargs)
def register(self, event_name):
func = partial(self.hook, registered_with=event_name)
self.emitter.register(event_name, func)
return func
def assert_hook_is_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after > starting:
self.fail("Handler was not called for event: %s" % event)
self.assertEqual(self.hook_calls[-1]['event_name'], event)
def assert_hook_is_not_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after == starting:
self.fail("Handler was called for event but was not "
"suppose to be called: %s, last_event: %s" %
(event, self.hook_calls[-1]))
def test_one_level_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
# Also register for a number of other events to check
# for false positives.
self.emitter.register('other.bar.baz', self.hook)
self.emitter.register('qqq.baz', self.hook)
self.emitter.register('dont.call.me', self.hook)
self.emitter.register('dont', self.hook)
# These calls should trigger our hook.
self.assert_hook_is_called_given_event('foo.bar.baz')
self.assert_hook_is_called_given_event('foo.qux.baz')
self.assert_hook_is_called_given_event('foo.anything.baz')
# These calls should not match our hook.
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('bar.qux.baz')
self.assert_hook_is_not_called_given_event('foo-bar')
def test_hierarchical_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_called_given_event('foo.bar.baz.qux.foo')
self.assert_hook_is_called_given_event('foo.qux.baz.qux')
self.assert_hook_is_called_given_event('foo.qux.baz.qux.foo')
self.assert_hook_is_not_called_given_event('bar.qux.baz.foo')
def test_multiple_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.ANY.THING.baz')
self.assert_hook_is_called_given_event('foo.AT.ALL.baz')
# More specific than what we registered for.
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra')
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra.stuff')
# Too short:
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
# Bad ending segment.
self.assert_hook_is_not_called_given_event('foo.ANY.THING.notbaz')
self.assert_hook_is_not_called_given_event('foo.ANY.THING.stillnotbaz')
def test_can_unregister_for_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
# Call multiple times to verify caching behavior.
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
def test_unregister_does_not_exist(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_cache_cleared_properly(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.bar', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_complicated_register_unregister(self):
r = self.emitter.register
u = partial(self.emitter.unregister, handler=self.hook)
r('foo.bar.baz.qux', self.hook)
r('foo.bar.baz', self.hook)
r('foo.bar', self.hook)
r('foo', self.hook)
u('foo.bar.baz')
u('foo')
u('foo.bar')
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo')
def test_register_multiple_handlers_for_same_event(self):
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
def test_register_with_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# Since we're using the same unique_id, this registration is ignored.
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# This also works across event names, so this registration is ignored
# as well.
self.emitter.register('foo.other', self.hook, unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.emit('foo.other')
self.assertEqual(len(self.hook_calls), 0)
def test_remove_handler_with_unique_id(self):
hook2 = lambda **kwargs: self.hook_calls.append(kwargs)
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
# Reset the hook calls.
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
# Can provide the unique_id to unregister.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
# Same as with not specifying a unique_id, you can call
# unregister multiple times and not get an exception.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
def test_remove_handler_with_and_without_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
def test_register_with_uses_count_initially(self):
self.emitter.register('foo',
self.hook,
unique_id='foo',
unique_id_uses_count=True)
# Subsequent calls must set ``unique_id_uses_count`` to True.
with self.assertRaises(ValueError):
self.emitter.register('foo', self.hook, unique_id='foo')
def test_register_with_uses_count_not_initially(self):
self.emitter.register('foo', self.hook, unique_id='foo')
# Subsequent calls must set ``unique_id_uses_count`` to False.
with self.assertRaises(ValueError):
self.emitter.register('foo',
self.hook,
unique_id='foo',
unique_id_uses_count=True)
def test_register_with_uses_count_unregister(self):
self.emitter.register('foo',
self.hook,
unique_id='foo',
unique_id_uses_count=True)
self.emitter.register('foo',
self.hook,
unique_id='foo',
unique_id_uses_count=True)
# Event was registered to use a count so it must be specified
# that a count is used when unregistering
with self.assertRaises(ValueError):
self.emitter.unregister('foo', self.hook, unique_id='foo')
# Event should not have been unregistered.
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 1)
self.emitter.unregister('foo',
self.hook,
unique_id='foo',
unique_id_uses_count=True)
# Event still should not be unregistered.
self.hook_calls = []
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 1)
self.emitter.unregister('foo',
self.hook,
unique_id='foo',
unique_id_uses_count=True)
# Now the event should be unregistered.
self.hook_calls = []
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 0)
def test_register_with_no_uses_count_unregister(self):
self.emitter.register('foo', self.hook, unique_id='foo')
# The event was not registered to use a count initially
with self.assertRaises(ValueError):
self.emitter.unregister('foo',
self.hook,
unique_id='foo',
unique_id_uses_count=True)
def test_handlers_called_in_order(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register('foo', partial(handler, call_number=1))
self.emitter.register('foo', partial(handler, call_number=2))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls], [1, 2])
def test_handler_call_order_with_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
# We go from most specific to least specific, and each level is called
# in the order they were registered for that particular hierarchy
# level.
self.emitter.register('foo.bar.baz', partial(handler, call_number=1))
self.emitter.register('foo.bar', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.register('foo.bar.baz', partial(handler, call_number=2))
self.emitter.register('foo.bar', partial(handler, call_number=4))
self.emitter.register('foo', partial(handler, call_number=6))
self.emitter.emit('foo.bar.baz')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5, 6])
def test_register_first_single_level(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
# Handlers registered through register_first() are always called
# before handlers registered with register().
self.emitter.register('foo', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=4))
self.emitter.register_first('foo', partial(handler, call_number=1))
self.emitter.register_first('foo', partial(handler, call_number=2))
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5])
def test_register_first_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.register('foo.bar', partial(handler, call_number=2))
self.emitter.register_first('foo', partial(handler, call_number=4))
self.emitter.register_first('foo.bar', partial(handler, call_number=1))
self.emitter.register('foo', partial(handler, call_number=6))
self.emitter.register('foo.bar', partial(handler, call_number=3))
self.emitter.emit('foo.bar')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5, 6])
def test_register_last_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register_last('foo', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=2))
self.emitter.register_first('foo', partial(handler, call_number=1))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3])
def test_register_unregister_first_last(self):
self.emitter.register('foo', self.hook)
self.emitter.register_last('foo.bar', self.hook)
self.emitter.register_first('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar', self.hook)
self.emitter.unregister('foo', self.hook)
self.emitter.emit('foo')
self.assertEqual(self.hook_calls, [])
class Session(object):
"""
The Session object collects together useful functionality
from `botocore` as well as important data such as configuration
information and credentials into a single, easy-to-use object.
:ivar available_profiles: A list of profiles defined in the config
file associated with this session.
:ivar profile: The current profile.
"""
FmtString = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
def __init__(self, env_vars=None, event_hooks=None,
include_builtin_handlers=True):
"""
Create a new Session object.
:type env_vars: dict
:param env_vars: A dictionary that is used to override some or all
of the environment variables associated with this session. The
key/value pairs defined in this dictionary will override the
corresponding variables defined in ``EnvironmentVariables``.
:type event_hooks: BaseEventHooks
:param event_hooks: The event hooks object to use. If one is not
provided, an event hooks object will be automatically created
for you.
:type include_builtin_handlers: bool
:param include_builtin_handlers: Indicates whether or not to
automatically register builtin handlers.
"""
self.env_vars = copy.copy(EnvironmentVariables)
if env_vars:
self.env_vars.update(env_vars)
if event_hooks is None:
self._events = HierarchicalEmitter()
else:
self._events = event_hooks
if include_builtin_handlers:
self._register_builtin_handlers(self._events)
self.user_agent_name = 'Botocore'
self.user_agent_version = __version__
self._profile = None
self._config = None
self._credentials = None
self._profile_map = None
def _register_builtin_handlers(self, events):
for event_name, handler in handlers.BUILTIN_HANDLERS:
self.register(event_name, handler)
@property
def available_profiles(self):
return list(self._build_profile_map().keys())
def _build_profile_map(self):
# This will build the profile map if it has not been created,
# otherwise it will return the cached value. The profile map
# is a list of profile names, to the config values for the profile.
if self._profile_map is None:
profile_map = {}
for key, values in self.full_config.items():
if key.startswith("profile"):
try:
parts = shlex.split(key)
except ValueError:
continue
if len(parts) == 2:
profile_map[parts[1]] = values
elif key == 'default':
# default section is special and is considered a profile
# name but we don't require you use 'profile "default"'
# as a section.
profile_map[key] = values
self._profile_map = profile_map
return self._profile_map
@property
def profile(self):
return self._profile
@profile.setter
def profile(self, profile):
self._profile = profile
def get_variable(self, logical_name, methods=('env', 'config')):
"""
Retrieve the value associated with the specified logical_name
from the environment or the config file. Values found in the
environment variable take precedence of values found in the
config file. If no value can be found, a None will be returned.
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to retrieve. This name will be mapped to the
appropriate environment variable name for this session as
well as the appropriate config file entry.
:type method: tuple
:param method: Defines which methods will be used to find
the variable value. By default, all available methods
are tried but you can limit which methods are used
by supplying a different value to this parameter.
Valid choices are: both|env|config
:returns: str value of variable of None if not defined.
"""
value = None
if logical_name in self.env_vars:
config_name, envvar_name, default = self.env_vars[logical_name]
if logical_name in ('config_file', 'profile'):
config_name = None
if logical_name == 'profile' and self._profile:
value = self._profile
elif 'env' in methods and envvar_name and envvar_name in os.environ:
value = os.environ[envvar_name]
elif 'config' in methods:
if config_name:
config = self.get_config()
value = config.get(config_name, default)
if value is None and default is not None:
value = default
return value
def get_config(self):
"""
Returns the configuration associated with this session. If
the configuration has not yet been loaded, it will be loaded
using the default ``profile`` session variable. If it has already been
loaded, the cached configuration will be returned.
Note that this configuration is specific to a single profile (the
``profile`` session variable).
If the ``profile`` session variable is set and the profile does
not exist in the config file, a ``ProfileNotFound`` exception
will be raised.
:raises: ConfigNotFound, ConfigParseError, ProfileNotFound
:rtype: dict
"""
config = self.full_config
profile_name = self.get_variable('profile')
profile_map = self._build_profile_map()
# If a profile is not explicitly set return the default
# profile config or an empty config dict if we don't have
# a default profile.
if profile_name is None:
return profile_map.get('default', {})
elif profile_name not in profile_map:
# Otherwise if they specified a profile, it has to
# exist (even if it's the default profile) otherwise
# we complain.
raise ProfileNotFound(profile=profile_name)
else:
return profile_map[profile_name]
@property
def full_config(self):
"""Return the parsed config file.
The ``get_config`` method returns the config associated with the
specified profile. This property returns the contents of the
**entire** config file.
:rtype: dict
"""
if self._config is None:
try:
self._config = botocore.config.get_config(self)
except ConfigNotFound:
self._config = {}
return self._config
def set_credentials(self, access_key, secret_key, token=None):
"""
Manually create credentials for this session. If you would
prefer to use botocore without a config file, environment variables,
or IAM roles, you can pass explicit credentials into this
method to establish credentials for this session.
:type access_key: str
:param access_key: The access key part of the credentials.
:type secret_key: str
:param secret_key: The secret key part of the credentials.
:type token: str
:param token: An option session token used by STS session
credentials.
"""
self._credentials = botocore.credentials.Credentials(access_key,
secret_key,
token)
self._credentials.method = 'explicit'
def get_credentials(self, metadata=None):
"""
Return the :class:`botocore.credential.Credential` object
associated with this session. If the credentials have not
yet been loaded, this will attempt to load them. If they
have already been loaded, this will return the cached
credentials.
:type metadata: dict
:param metadata: This parameter allows you to pass in
EC2 instance metadata containing IAM Role credentials.
This metadata will be used rather than retrieving the
metadata from the metadata service. This is mainly used
for unit testing.
"""
if self._credentials is None:
self._credentials = botocore.credentials.get_credentials(self,
metadata)
return self._credentials
def user_agent(self):
"""
Return a string suitable for use as a User-Agent header.
The string will be of the form:
<agent_name>/<agent_version> Python/<py_ver> <plat_name>/<plat_ver>
Where:
- agent_name is the value of the `user_agent_name` attribute
of the session object (`Boto` by default).
- agent_version is the value of the `user_agent_version`
attribute of the session object (the botocore version by default).
by default.
- py_ver is the version of the Python interpreter beng used.
- plat_name is the name of the platform (e.g. Darwin)
- plat_ver is the version of the platform
"""
return '%s/%s Python/%s %s/%s' % (self.user_agent_name,
self.user_agent_version,
platform.python_version(),
platform.system(),
platform.release())
def get_data(self, data_path):
"""
Retrieve the data associated with `data_path`.
:type data_path: str
:param data_path: The path to the data you wish to retrieve.
"""
return botocore.base.get_data(self, data_path)
def get_service_data(self, service_name, provider_name='aws'):
"""
Retrieve the fully merged data associated with a service.
"""
data_path = '%s/%s' % (provider_name, service_name)
service_data = self.get_data(data_path)
return service_data
def get_available_services(self, provider_name='aws'):
"""
Return a list of names of available services.
"""
data_path = '%s' % provider_name
return self.get_data(data_path)
def get_service(self, service_name, provider_name='aws'):
"""
Get information about a service.
:type service_name: str
:param service_name: The name of the service (e.g. 'ec2')
:type provider_name: str
:param provider_name: The name of the provider. Defaults
to 'aws'.
:returns: :class:`botocore.service.Service`
"""
service = botocore.service.get_service(self, service_name,
provider_name)
event = self.create_event('service-created')
self._events.emit(event, service=service)
return service
def set_debug_logger(self):
"""
Convenience function to quickly configure full debug output
to go to the console.
"""
log = logging.getLogger('botocore')
log.setLevel(logging.DEBUG)
# create console handler and set level to debug
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
# create formatter
formatter = logging.Formatter(self.FmtString)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def set_file_logger(self, log_level, path):
"""
Convenience function to quickly configure any level of logging
to a file.
:type log_level: int
:param log_level: A log level as specified in the `logging` module
:type path: string
:param path: Path to the log file. The file will be created
if it doesn't already exist.
"""
log = logging.getLogger('botocore')
log.setLevel(log_level)
# create console handler and set level to debug
ch = logging.FileHandler(path)
ch.setLevel(log_level)
# create formatter
formatter = logging.Formatter(self.FmtString)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def register(self, event_name, handler):
"""Register a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to invoke when the event
is emitted. This object must be callable, and must
accept ``**kwargs``. If either of these preconditions are
not met, a ``ValueError`` will be raised.
"""
self._events.register(event_name, handler)
def unregister(self, event_name, handler):
"""Unregister a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to unregister.
"""
self._events.unregister(event_name, handler)
def create_event(self, event_name, *fmtargs):
"""
Creates a new event string that can then be emitted.
You could just create it manually, since it's just
a string but this helps to define the range of known events.
:type event_name: str
:param event_name: The base name of the new event.
:type fmtargs: tuple
:param fmtargs: A tuple of values that will be used as the
arguments pass to the string formatting operation. The
actual values passed depend on the type of event you
are creating.
"""
if event_name in AllEvents:
fmt_string = AllEvents[event_name]
if fmt_string:
event = event_name + (fmt_string % fmtargs)
else:
event = event_name
return event
raise EventNotFound(event_name=event_name)
def emit(self, event_name, **kwargs):
return self._events.emit(event_name, **kwargs)
def emit_first_non_none_response(self, event_name, **kwargs):
responses = self._events.emit(event_name, **kwargs)
return first_non_none_response(responses)
class Session(object):
"""
The Session object collects together useful functionality
from `botocore` as well as important data such as configuration
information and credentials into a single, easy-to-use object.
:ivar available_profiles: A list of profiles defined in the config
file associated with this session.
:ivar profile: The current profile.
"""
AllEvents = {
'after-call': '.%s.%s',
'after-parsed': '.%s.%s.%s.%s',
'before-parameter-build': '.%s.%s',
'before-call': '.%s.%s',
'service-created': '',
'service-data-loaded': '.%s',
'creating-endpoint': '.%s',
'before-auth': '.%s',
'needs-retry': '.%s.%s',
}
"""
A dictionary where each key is an event name and the value
is the formatting string used to construct a new event.
"""
SessionVariables = {
# logical: config_file, env_var, default_value
'profile': (None, ['AWS_DEFAULT_PROFILE', 'AWS_PROFILE'], None),
'region': ('region', 'AWS_DEFAULT_REGION', None),
'data_path': ('data_path', 'AWS_DATA_PATH', None),
'config_file': (None, 'AWS_CONFIG_FILE', '~/.aws/config'),
'provider': ('provider', 'BOTO_PROVIDER_NAME', 'aws'),
# These variables are intended for internal use so don't have any
# user settable values.
# This is the shared credentials file amongst sdks.
'credentials_file': (None, None, '~/.aws/credentials'),
# These variables only exist in the config file.
# This is the number of seconds until we time out a request to
# the instance metadata service.
'metadata_service_timeout': ('metadata_service_timeout', None, 1),
# This is the number of request attempts we make until we give
# up trying to retrieve data from the instance metadata service.
'metadata_service_num_attempts': ('metadata_service_num_attempts',
None, 1),
}
"""
A default dictionary that maps the logical names for session variables
to the specific environment variables and configuration file names
that contain the values for these variables.
When creating a new Session object, you can pass in your own dictionary to
remap the logical names or to add new logical names. You can then get the
current value for these variables by using the ``get_config_variable``
method of the :class:`botocore.session.Session` class.
The default set of logical variable names are:
* profile - Default profile name you want to use.
* region - Default region name to use, if not otherwise specified.
* data_path - Additional directories to search for data files.
* config_file - Location of a Boto config file.
* provider - The name of the service provider (e.g. aws)
These form the keys of the dictionary. The values in the dictionary
are tuples of (<config_name>, <environment variable>, <default value).
The ``profile`` and ``config_file`` variables should always have a
None value for the first entry in the tuple because it doesn't make
sense to look inside the config file for the location of the config
file or for the default profile to use.
The ``config_name`` is the name to look for in the configuration file,
the ``env var`` is the OS environment variable (``os.environ``) to
use, and ``default_value`` is the value to use if no value is otherwise
found.
"""
FmtString = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
def __init__(self, session_vars=None, event_hooks=None,
include_builtin_handlers=True, loader=None):
"""
Create a new Session object.
:type session_vars: dict
:param session_vars: A dictionary that is used to override some or all
of the environment variables associated with this session. The
key/value pairs defined in this dictionary will override the
corresponding variables defined in ``SessionVariables``.
:type event_hooks: BaseEventHooks
:param event_hooks: The event hooks object to use. If one is not
provided, an event hooks object will be automatically created
for you.
:type include_builtin_handlers: bool
:param include_builtin_handlers: Indicates whether or not to
automatically register builtin handlers.
"""
self.session_var_map = copy.copy(self.SessionVariables)
if session_vars:
self.session_var_map.update(session_vars)
if event_hooks is None:
self._events = HierarchicalEmitter()
else:
self._events = event_hooks
if include_builtin_handlers:
self._register_builtin_handlers(self._events)
self.user_agent_name = 'Botocore'
self.user_agent_version = __version__
self.user_agent_extra = ''
self._profile = None
self._config = None
self._credentials = None
self._profile_map = None
self._provider = None
# This is a dict that stores per session specific config variable
# overrides via set_config_variable().
self._session_instance_vars = {}
# _data_paths_added is used to track whether or not we added
# extra paths to the loader. We will do this lazily
# only when we ask for the loader.
self._data_paths_added = False
self._components = ComponentLocator()
self._register_components()
def _register_components(self):
self._register_credential_provider()
self._register_data_loader()
self._register_endpoint_resolver()
self._register_event_emitter()
self._register_response_parser_factory()
def _register_event_emitter(self):
self._components.register_component('event_emitter', self._events)
def _register_credential_provider(self):
self._components.lazy_register_component(
'credential_provider',
lambda: botocore.credentials.create_credential_resolver(self))
def _register_data_loader(self):
self._components.lazy_register_component(
'data_loader',
lambda: create_loader(self.get_config_variable('data_path')))
def _register_endpoint_resolver(self):
self._components.lazy_register_component(
'endpoint_resolver',
lambda: regions.EndpointResolver(self.get_data('_endpoints')))
def _register_response_parser_factory(self):
self._components.register_component('response_parser_factory',
ResponseParserFactory())
def _reset_components(self):
self._register_components()
def _register_builtin_handlers(self, events):
for spec in handlers.BUILTIN_HANDLERS:
if len(spec) == 2:
event_name, handler = spec
self.register(event_name, handler)
else:
event_name, handler, register_type = spec
if register_type is handlers.REGISTER_FIRST:
self._events.register_first(event_name, handler)
elif register_first is handlers.REGISTER_LAST:
self._events.register_last(event_name, handler)
@property
def provider(self):
if self._provider is None:
self._provider = get_provider(
self, self.get_config_variable('provider'))
return self._provider
@property
def available_profiles(self):
return list(self._build_profile_map().keys())
def _build_profile_map(self):
# This will build the profile map if it has not been created,
# otherwise it will return the cached value. The profile map
# is a list of profile names, to the config values for the profile.
if self._profile_map is None:
self._profile_map = self.full_config['profiles']
return self._profile_map
@property
def profile(self):
return self._profile
@profile.setter
def profile(self, profile):
# Since provider can be specified in profile, changing the
# profile should reset the provider.
self._provider = None
self._profile = profile
# Need to potentially reload the config file/creds.
self._reset_components()
def get_config_variable(self, logical_name,
methods=('instance', 'env', 'config'),
default=None):
"""
Retrieve the value associated with the specified logical_name
from the environment or the config file. Values found in the
environment variable take precedence of values found in the
config file. If no value can be found, a None will be returned.
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to retrieve. This name will be mapped to the
appropriate environment variable name for this session as
well as the appropriate config file entry.
:type method: tuple
:param method: Defines which methods will be used to find
the variable value. By default, all available methods
are tried but you can limit which methods are used
by supplying a different value to this parameter.
Valid choices are: instance|env|config
:param default: The default value to return if there is no
value associated with the config file. This value will
override any default value specified in ``SessionVariables``.
:returns: str value of variable of None if not defined.
"""
value = None
# There's two types of defaults here. One if the
# default value specified in the SessionVariables.
# The second is an explicit default value passed into this
# function (the default parameter).
# config_default is tracking the default value specified
# in the SessionVariables.
config_default = None
if logical_name in self.session_var_map:
# Short circuit case, check if the var has been explicitly
# overriden via set_config_variable.
if 'instance' in methods and \
logical_name in self._session_instance_vars:
return self._session_instance_vars[logical_name]
config_name, envvar_name, config_default = self.session_var_map[
logical_name]
if logical_name in ('config_file', 'profile'):
config_name = None
if logical_name == 'profile' and self._profile:
value = self._profile
elif 'env' in methods and envvar_name and self._handle_env_vars(
envvar_name, os.environ) is not None:
value = self._handle_env_vars(envvar_name, os.environ)
elif 'config' in methods:
if config_name:
config = self.get_scoped_config()
value = config.get(config_name)
# If we don't have a value at this point, we need to try to assign
# a default value. An explicit default argument will win over the
# default value from SessionVariables.
if value is None and default is not None:
value = default
if value is None and config_default is not None:
value = config_default
return value
def _handle_env_vars(self, names, environ):
# We need to handle the case where names is either
# a single value or a list of variables.
if not isinstance(names, list):
names = [names]
for name in names:
if name in environ:
return environ[name]
return None
def set_config_variable(self, logical_name, value):
"""Set a configuration variable to a specific value.
By using this method, you can override the normal lookup
process used in ``get_config_variable`` by explicitly setting
a value. Subsequent calls to ``get_config_variable`` will
use the ``value``. This gives you per-session specific
configuration values.
::
>>> # Assume logical name 'foo' maps to env var 'FOO'
>>> os.environ['FOO'] = 'myvalue'
>>> s.get_config_variable('foo')
'myvalue'
>>> s.set_config_variable('foo', 'othervalue')
>>> s.get_config_variable('foo')
'othervalue'
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to set. These are the keys in ``SessionVariables``.
:param value: The value to associate with the config variable.
"""
self._session_instance_vars[logical_name] = value
def get_scoped_config(self):
"""
Returns the config values from the config file scoped to the current
profile.
The configuration data is loaded **only** from the config file.
It does not resolve variables based on different locations
(e.g. first from the session instance, then from environment
variables, then from the config file). If you want this lookup
behavior, use the ``get_config_variable`` method instead.
Note that this configuration is specific to a single profile (the
``profile`` session variable).
If the ``profile`` session variable is set and the profile does
not exist in the config file, a ``ProfileNotFound`` exception
will be raised.
:raises: ConfigNotFound, ConfigParseError, ProfileNotFound
:rtype: dict
"""
profile_name = self.get_config_variable('profile')
profile_map = self._build_profile_map()
# If a profile is not explicitly set return the default
# profile config or an empty config dict if we don't have
# a default profile.
if profile_name is None:
return profile_map.get('default', {})
elif profile_name not in profile_map:
# Otherwise if they specified a profile, it has to
# exist (even if it's the default profile) otherwise
# we complain.
raise ProfileNotFound(profile=profile_name)
else:
return profile_map[profile_name]
@property
def full_config(self):
"""Return the parsed config file.
The ``get_config`` method returns the config associated with the
specified profile. This property returns the contents of the
**entire** config file.
:rtype: dict
"""
if self._config is None:
try:
config_file = self.get_config_variable('config_file')
self._config = botocore.config.load_config(config_file)
except ConfigNotFound:
self._config = {'profiles': {}}
try:
# Now we need to inject the profiles from the
# credentials file. We don't actually need the values
# in the creds file, only the profile names so that we
# can validate the user is not referring to a nonexistent
# profile.
cred_file = self.get_config_variable('credentials_file')
cred_profiles = botocore.config.raw_config_parse(cred_file)
for profile in cred_profiles:
cred_vars = cred_profiles[profile]
if profile not in self._config['profiles']:
self._config['profiles'][profile] = cred_vars
else:
self._config['profiles'][profile].update(cred_vars)
except ConfigNotFound:
pass
return self._config
def set_credentials(self, access_key, secret_key, token=None):
"""
Manually create credentials for this session. If you would
prefer to use botocore without a config file, environment variables,
or IAM roles, you can pass explicit credentials into this
method to establish credentials for this session.
:type access_key: str
:param access_key: The access key part of the credentials.
:type secret_key: str
:param secret_key: The secret key part of the credentials.
:type token: str
:param token: An option session token used by STS session
credentials.
"""
self._credentials = botocore.credentials.Credentials(access_key,
secret_key,
token)
def get_credentials(self):
"""
Return the :class:`botocore.credential.Credential` object
associated with this session. If the credentials have not
yet been loaded, this will attempt to load them. If they
have already been loaded, this will return the cached
credentials.
"""
if self._credentials is None:
self._credentials = self._components.get_component(
'credential_provider').load_credentials()
return self._credentials
def user_agent(self):
"""
Return a string suitable for use as a User-Agent header.
The string will be of the form:
<agent_name>/<agent_version> Python/<py_ver> <plat_name>/<plat_ver>
Where:
- agent_name is the value of the `user_agent_name` attribute
of the session object (`Boto` by default).
- agent_version is the value of the `user_agent_version`
attribute of the session object (the botocore version by default).
by default.
- py_ver is the version of the Python interpreter beng used.
- plat_name is the name of the platform (e.g. Darwin)
- plat_ver is the version of the platform
If ``user_agent_extra`` is not empty, then this value will be
appended to the end of the user agent string.
"""
base = '%s/%s Python/%s %s/%s' % (self.user_agent_name,
self.user_agent_version,
platform.python_version(),
platform.system(),
platform.release())
if self.user_agent_extra:
base += ' %s' % self.user_agent_extra
return base
def get_data(self, data_path):
"""
Retrieve the data associated with `data_path`.
:type data_path: str
:param data_path: The path to the data you wish to retrieve.
"""
return self.get_component('data_loader').load_data(data_path)
def get_service_model(self, service_name, api_version=None):
"""Get the service model object.
:type service_name: string
:param service_name: The service name
:type api_version: string
:param api_version: The API version of the service. If none is
provided, then the latest API version will be used.
:rtype: L{botocore.model.ServiceModel}
:return: The botocore service model for the service.
"""
service_description = self.get_service_data(service_name, api_version)
return ServiceModel(service_description, service_name=service_name)
def get_waiter_model(self, service_name, api_version=None):
loader = self.get_component('data_loader')
waiter_config = loader.load_service_model(
service_name, 'waiters-2', api_version)
return waiter.WaiterModel(waiter_config)
def get_paginator_model(self, service_name, api_version=None):
loader = self.get_component('data_loader')
paginator_config = loader.load_service_model(
service_name, 'paginators-1', api_version)
return paginate.PaginatorModel(paginator_config)
def get_service_data(self, service_name, api_version=None):
"""
Retrieve the fully merged data associated with a service.
"""
data_path = service_name
service_data = self.get_component('data_loader').load_service_model(
data_path,
type_name='service-2',
api_version=api_version
)
event_name = self.create_event('service-data-loaded', service_name)
self._events.emit(event_name, service_data=service_data,
service_name=service_name, session=self)
return service_data
def get_available_services(self):
"""
Return a list of names of available services.
"""
return self.get_component('data_loader')\
.list_available_services(type_name='service-2')
def get_service(self, service_name, api_version=None):
"""
Get information about a service.
.. warning::
This method is deprecated and will be removed in the
near future. Use ``session.create_client`` instead.
:type service_name: str
:param service_name: The name of the service (e.g. 'ec2')
:returns: :class:`botocore.service.Service`
"""
warnings.warn("get_service is deprecated and will be removed. "
"Use create_client instead.", ImminentRemovalWarning)
service = botocore.service.get_service(self, service_name,
self.provider,
api_version=api_version)
event = self.create_event('service-created')
self._events.emit(event, service=service)
return service
def set_debug_logger(self, logger_name='botocore'):
"""
Convenience function to quickly configure full debug output
to go to the console.
"""
self.set_stream_logger(logger_name, logging.DEBUG)
def set_stream_logger(self, logger_name, log_level, stream=None,
format_string=None):
"""
Convenience method to configure a stream logger.
:type logger_name: str
:param logger_name: The name of the logger to configure
:type log_level: str
:param log_level: The log level to set for the logger. This
is any param supported by the ``.setLevel()`` method of
a ``Log`` object.
:type stream: file
:param stream: A file like object to log to. If none is provided
then sys.stderr will be used.
:type format_string: str
:param format_string: The format string to use for the log
formatter. If none is provided this will default to
``self.FmtString``.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
ch = logging.StreamHandler(stream)
ch.setLevel(log_level)
# create formatter
if format_string is None:
format_string = self.FmtString
formatter = logging.Formatter(format_string)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def set_file_logger(self, log_level, path, logger_name='botocore'):
"""
Convenience function to quickly configure any level of logging
to a file.
:type log_level: int
:param log_level: A log level as specified in the `logging` module
:type path: string
:param path: Path to the log file. The file will be created
if it doesn't already exist.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
# create console handler and set level to debug
ch = logging.FileHandler(path)
ch.setLevel(log_level)
# create formatter
formatter = logging.Formatter(self.FmtString)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def register(self, event_name, handler, unique_id=None,
unique_id_uses_count=False):
"""Register a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to invoke when the event
is emitted. This object must be callable, and must
accept ``**kwargs``. If either of these preconditions are
not met, a ``ValueError`` will be raised.
:type unique_id: str
:param unique_id: An optional identifier to associate with the
registration. A unique_id can only be used once for
the entire session registration (unless it is unregistered).
This can be used to prevent an event handler from being
registered twice.
:param unique_id_uses_count: boolean
:param unique_id_uses_count: Specifies if the event should maintain
a count when a ``unique_id`` is registered and unregisted. The
event can only be completely unregistered once every register call
using the unique id has been matched by an ``unregister`` call.
If ``unique_id`` is specified, subsequent ``register``
calls must use the same value for ``unique_id_uses_count``
as the ``register`` call that first registered the event.
:raises ValueError: If the call to ``register`` uses ``unique_id``
but the value for ``unique_id_uses_count`` differs from the
``unique_id_uses_count`` value declared by the very first
``register`` call for that ``unique_id``.
"""
self._events.register(event_name, handler, unique_id,
unique_id_uses_count=unique_id_uses_count)
def unregister(self, event_name, handler=None, unique_id=None,
unique_id_uses_count=False):
"""Unregister a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to unregister.
:type unique_id: str
:param unique_id: A unique identifier identifying the callback
to unregister. You can provide either the handler or the
unique_id, you do not have to provide both.
:param unique_id_uses_count: boolean
:param unique_id_uses_count: Specifies if the event should maintain
a count when a ``unique_id`` is registered and unregisted. The
event can only be completely unregistered once every ``register``
call using the ``unique_id`` has been matched by an ``unregister``
call. If the ``unique_id`` is specified, subsequent
``unregister`` calls must use the same value for
``unique_id_uses_count`` as the ``register`` call that first
registered the event.
:raises ValueError: If the call to ``unregister`` uses ``unique_id``
but the value for ``unique_id_uses_count`` differs from the
``unique_id_uses_count`` value declared by the very first
``register`` call for that ``unique_id``.
"""
self._events.unregister(event_name, handler=handler,
unique_id=unique_id,
unique_id_uses_count=unique_id_uses_count)
def register_event(self, event_name, fmtstr):
"""
Register a new event. The event will be added to ``AllEvents``
and will then be able to be created using ``create_event``.
:type event_name: str
:param event_name: The base name of the event.
:type fmtstr: str
:param fmtstr: The formatting string for the event.
"""
if event_name not in self.AllEvents:
self.AllEvents[event_name] = fmtstr
def create_event(self, event_name, *fmtargs):
"""
Creates a new event string that can then be emitted.
You could just create it manually, since it's just
a string but this helps to define the range of known events.
:type event_name: str
:param event_name: The base name of the new event.
:type fmtargs: tuple
:param fmtargs: A tuple of values that will be used as the
arguments pass to the string formatting operation. The
actual values passed depend on the type of event you
are creating.
"""
if event_name in self.AllEvents:
fmt_string = self.AllEvents[event_name]
if fmt_string:
event = event_name + (fmt_string % fmtargs)
else:
event = event_name
return event
raise EventNotFound(event_name=event_name)
def emit(self, event_name, **kwargs):
return self._events.emit(event_name, **kwargs)
def emit_first_non_none_response(self, event_name, **kwargs):
responses = self._events.emit(event_name, **kwargs)
return first_non_none_response(responses)
def get_component(self, name):
return self._components.get_component(name)
def register_component(self, name, component):
self._components.register_component(name, component)
def lazy_register_component(self, name, component):
self._components.lazy_register_component(name, component)
def create_client(self, service_name, region_name=None, api_version=None,
use_ssl=True, verify=None, endpoint_url=None,
aws_access_key_id=None, aws_secret_access_key=None,
aws_session_token=None, config=None):
"""Create a botocore client.
:type service_name: string
:param service_name: The name of the service for which a client will
be created. You can use the ``Sesssion.get_available_services()``
method to get a list of all available service names.
:type region_name: string
:param region_name: The name of the region associated with the client.
A client is associated with a single region.
:type api_version: string
:param api_version: The API version to use. By default, botocore will
use the latest API version when creating a client. You only need
to specify this parameter if you want to use a previous API version
of the client.
:type use_ssl: boolean
:param use_ssl: Whether or not to use SSL. By default, SSL is used. Note that
not all services support non-ssl connections.
:type verify: boolean/string
:param verify: Whether or not to verify SSL certificates. By default SSL certificates
are verified. You can provide the following values:
* False - do not validate SSL certificates. SSL will still be
used (unless use_ssl is False), but SSL certificates
will not be verified.
* path/to/cert/bundle.pem - A filename of the CA cert bundle to
uses. You can specify this argument if you want to use a different
CA cert bundle than the one used by botocore.
:type endpoint_url: string
:param endpoint_url: The complete URL to use for the constructed client.
Normally, botocore will automatically construct the appropriate URL
to use when communicating with a service. You can specify a
complete URL (including the "http/https" scheme) to override this
behavior. If this value is provided, then ``use_ssl`` is ignored.
:type aws_access_key_id: string
:param aws_access_key_id: The access key to use when creating
the client. This is entirely optional, and if not provided,
the credentials configured for the session will automatically
be used. You only need to provide this argument if you want
to override the credentials used for this specific client.
:type aws_secret_access_key: string
:param aws_secret_access_key: The secret key to use when creating
the client. Same semantics as aws_access_key_id above.
:type aws_session_token: string
:param aws_session_token: The session token to use when creating
the client. Same semantics as aws_access_key_id above.
:type config: botocore.client.Config
:param config: Advanced client configuration options.
:rtype: botocore.client.BaseClient
:return: A botocore client instance
"""
if region_name is None:
region_name = self.get_config_variable('region')
loader = self.get_component('data_loader')
event_emitter = self.get_component('event_emitter')
response_parser_factory = self.get_component(
'response_parser_factory')
if aws_secret_access_key is not None:
credentials = botocore.credentials.Credentials(
access_key=aws_access_key_id,
secret_key=aws_secret_access_key,
token=aws_session_token)
else:
credentials = self.get_credentials()
endpoint_resolver = self.get_component('endpoint_resolver')
client_creator = botocore.client.ClientCreator(
loader, endpoint_resolver, self.user_agent(), event_emitter,
retryhandler, translate, response_parser_factory)
client = client_creator.create_client(
service_name, region_name, use_ssl, endpoint_url, verify,
credentials, scoped_config=self.get_scoped_config(),
client_config=config)
return client
class TestWildcardHandlers(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook(self, **kwargs):
self.hook_calls.append(kwargs)
def register(self, event_name):
func = partial(self.hook, registered_with=event_name)
self.emitter.register(event_name, func)
return func
def assert_hook_is_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after > starting:
self.fail("Handler was not called for event: %s" % event)
self.assertEqual(self.hook_calls[-1]['event_name'], event)
def assert_hook_is_not_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after == starting:
self.fail("Handler was called for event but was not "
"suppose to be called: %s, last_event: %s" %
(event, self.hook_calls[-1]))
def test_one_level_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
# Also register for a number of other events to check
# for false positives.
self.emitter.register('other.bar.baz', self.hook)
self.emitter.register('qqq.baz', self.hook)
self.emitter.register('dont.call.me', self.hook)
self.emitter.register('dont', self.hook)
# These calls should trigger our hook.
self.assert_hook_is_called_given_event('foo.bar.baz')
self.assert_hook_is_called_given_event('foo.qux.baz')
self.assert_hook_is_called_given_event('foo.anything.baz')
# These calls should not match our hook.
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('bar.qux.baz')
self.assert_hook_is_not_called_given_event('foo-bar')
def test_hierarchical_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_called_given_event('foo.bar.baz.qux.foo')
self.assert_hook_is_called_given_event('foo.qux.baz.qux')
self.assert_hook_is_called_given_event('foo.qux.baz.qux.foo')
self.assert_hook_is_not_called_given_event('bar.qux.baz.foo')
def test_multiple_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.ANY.THING.baz')
self.assert_hook_is_called_given_event('foo.AT.ALL.baz')
# More specific than what we registered for.
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra')
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra.stuff')
# Too short:
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
# Bad ending segment.
self.assert_hook_is_not_called_given_event('foo.ANY.THING.notbaz')
self.assert_hook_is_not_called_given_event('foo.ANY.THING.stillnotbaz')
def test_can_unregister_for_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
# Call multiple times to verify caching behavior.
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
def test_unregister_does_not_exist(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_cache_cleared_properly(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.bar', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_complicated_register_unregister(self):
r = self.emitter.register
u = partial(self.emitter.unregister, handler=self.hook)
r('foo.bar.baz.qux', self.hook)
r('foo.bar.baz', self.hook)
r('foo.bar', self.hook)
r('foo', self.hook)
u('foo.bar.baz')
u('foo')
u('foo.bar')
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo')
def test_register_multiple_handlers_for_same_event(self):
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
def test_register_with_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# Since we're using the same unique_id, this registration is ignored.
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# This also works across event names, so this registration is ignored
# as well.
self.emitter.register('foo.other', self.hook, unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.emit('foo.other')
self.assertEqual(len(self.hook_calls), 0)
def test_remove_handler_with_unique_id(self):
hook2 = lambda **kwargs: self.hook_calls.append(kwargs)
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
# Reset the hook calls.
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
# Can provide the unique_id to unregister.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
# Same as with not specifying a unique_id, you can call
# unregister multiple times and not get an exception.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
def test_remove_handler_with_and_without_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
def test_register_with_uses_count_initially(self):
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Subsequent calls must set ``unique_id_uses_count`` to True.
with self.assertRaises(ValueError):
self.emitter.register('foo', self.hook, unique_id='foo')
def test_register_with_uses_count_not_initially(self):
self.emitter.register('foo', self.hook, unique_id='foo')
# Subsequent calls must set ``unique_id_uses_count`` to False.
with self.assertRaises(ValueError):
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
def test_register_with_uses_count_unregister(self):
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Event was registered to use a count so it must be specified
# that a count is used when unregistering
with self.assertRaises(ValueError):
self.emitter.unregister('foo', self.hook, unique_id='foo')
# Event should not have been unregistered.
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 1)
self.emitter.unregister('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Event still should not be unregistered.
self.hook_calls = []
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 1)
self.emitter.unregister('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Now the event should be unregistered.
self.hook_calls = []
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 0)
def test_register_with_no_uses_count_unregister(self):
self.emitter.register('foo', self.hook, unique_id='foo')
# The event was not registered to use a count initially
with self.assertRaises(ValueError):
self.emitter.unregister('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
def test_handlers_called_in_order(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register('foo', partial(handler, call_number=1))
self.emitter.register('foo', partial(handler, call_number=2))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2])
def test_handler_call_order_with_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
# We go from most specific to least specific, and each level is called
# in the order they were registered for that particular hierarchy
# level.
self.emitter.register('foo.bar.baz', partial(handler, call_number=1))
self.emitter.register('foo.bar', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.register('foo.bar.baz', partial(handler, call_number=2))
self.emitter.register('foo.bar', partial(handler, call_number=4))
self.emitter.register('foo', partial(handler, call_number=6))
self.emitter.emit('foo.bar.baz')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5, 6])
def test_register_first_single_level(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
# Handlers registered through register_first() are always called
# before handlers registered with register().
self.emitter.register('foo', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=4))
self.emitter.register_first('foo', partial(handler, call_number=1))
self.emitter.register_first('foo', partial(handler, call_number=2))
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5])
def test_register_first_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.register('foo.bar', partial(handler, call_number=2))
self.emitter.register_first('foo', partial(handler, call_number=4))
self.emitter.register_first('foo.bar', partial(handler, call_number=1))
self.emitter.register('foo', partial(handler, call_number=6))
self.emitter.register('foo.bar', partial(handler, call_number=3))
self.emitter.emit('foo.bar')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5, 6])
def test_register_last_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register_last('foo', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=2))
self.emitter.register_first('foo', partial(handler, call_number=1))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3])
def test_register_unregister_first_last(self):
self.emitter.register('foo', self.hook)
self.emitter.register_last('foo.bar', self.hook)
self.emitter.register_first('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar', self.hook)
self.emitter.unregister('foo', self.hook)
self.emitter.emit('foo')
self.assertEqual(self.hook_calls, [])
class Session(object):
"""
The Session object collects together useful functionality
from `botocore` as well as important data such as configuration
information and credentials into a single, easy-to-use object.
:ivar available_profiles: A list of profiles defined in the config
file associated with this session.
:ivar profile: The current profile.
"""
FmtString = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
def __init__(self, env_vars=None, event_hooks=None,
include_builtin_handlers=True):
"""
Create a new Session object.
:type env_vars: dict
:param env_vars: A dictionary that is used to override some or all
of the environment variables associated with this session. The
key/value pairs defined in this dictionary will override the
corresponding variables defined in ``EnvironmentVariables``.
:type event_hooks: BaseEventHooks
:param event_hooks: The event hooks object to use. If one is not
provided, an event hooks object will be automatically created
for you.
:type include_builtin_handlers: bool
:param include_builtin_handlers: Indicates whether or not to
automatically register builtin handlers.
"""
self.env_vars = copy.copy(EnvironmentVariables)
if env_vars:
self.env_vars.update(env_vars)
if event_hooks is None:
self._events = HierarchicalEmitter()
else:
self._events = event_hooks
if include_builtin_handlers:
self._register_builtin_handlers(self._events)
self.user_agent_name = 'Botocore'
self.user_agent_version = __version__
self._profile = None
self._config = None
self._credentials = None
self._profile_map = None
self._provider = None
def _register_builtin_handlers(self, events):
for event_name, handler in handlers.BUILTIN_HANDLERS:
self.register(event_name, handler)
@property
def provider(self):
if self._provider is None:
self._provider = get_provider(self, self.get_variable('provider'))
return self._provider
@property
def available_profiles(self):
return list(self._build_profile_map().keys())
def _build_profile_map(self):
# This will build the profile map if it has not been created,
# otherwise it will return the cached value. The profile map
# is a list of profile names, to the config values for the profile.
if self._profile_map is None:
profile_map = {}
for key, values in self.full_config.items():
if key.startswith("profile"):
try:
parts = shlex.split(key)
except ValueError:
continue
if len(parts) == 2:
profile_map[parts[1]] = values
elif key == 'default':
# default section is special and is considered a profile
# name but we don't require you use 'profile "default"'
# as a section.
profile_map[key] = values
self._profile_map = profile_map
return self._profile_map
@property
def profile(self):
return self._profile
@profile.setter
def profile(self, profile):
# Since provider can be specified in profile, changing the
# profile should reset the provider.
self._provider = None
self._profile = profile
def get_variable(self, logical_name, methods=('env', 'config')):
"""
Retrieve the value associated with the specified logical_name
from the environment or the config file. Values found in the
environment variable take precedence of values found in the
config file. If no value can be found, a None will be returned.
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to retrieve. This name will be mapped to the
appropriate environment variable name for this session as
well as the appropriate config file entry.
:type method: tuple
:param method: Defines which methods will be used to find
the variable value. By default, all available methods
are tried but you can limit which methods are used
by supplying a different value to this parameter.
Valid choices are: both|env|config
:returns: str value of variable of None if not defined.
"""
value = None
default = None
if logical_name in self.env_vars:
config_name, envvar_name, default = self.env_vars[logical_name]
if logical_name in ('config_file', 'profile'):
config_name = None
if logical_name == 'profile' and self._profile:
value = self._profile
elif 'env' in methods and envvar_name and envvar_name in os.environ:
value = os.environ[envvar_name]
elif 'config' in methods:
if config_name:
config = self.get_config()
value = config.get(config_name, default)
if value is None and default is not None:
value = default
return value
def get_config(self):
"""
Returns the configuration associated with this session. If
the configuration has not yet been loaded, it will be loaded
using the default ``profile`` session variable. If it has already been
loaded, the cached configuration will be returned.
Note that this configuration is specific to a single profile (the
``profile`` session variable).
If the ``profile`` session variable is set and the profile does
not exist in the config file, a ``ProfileNotFound`` exception
will be raised.
:raises: ConfigNotFound, ConfigParseError, ProfileNotFound
:rtype: dict
"""
profile_name = self.get_variable('profile')
profile_map = self._build_profile_map()
# If a profile is not explicitly set return the default
# profile config or an empty config dict if we don't have
# a default profile.
if profile_name is None:
return profile_map.get('default', {})
elif profile_name not in profile_map:
# Otherwise if they specified a profile, it has to
# exist (even if it's the default profile) otherwise
# we complain.
raise ProfileNotFound(profile=profile_name)
else:
return profile_map[profile_name]
@property
def full_config(self):
"""Return the parsed config file.
The ``get_config`` method returns the config associated with the
specified profile. This property returns the contents of the
**entire** config file.
:rtype: dict
"""
if self._config is None:
try:
self._config = botocore.config.get_config(self)
except ConfigNotFound:
self._config = {}
return self._config
def set_credentials(self, access_key, secret_key, token=None):
"""
Manually create credentials for this session. If you would
prefer to use botocore without a config file, environment variables,
or IAM roles, you can pass explicit credentials into this
method to establish credentials for this session.
:type access_key: str
:param access_key: The access key part of the credentials.
:type secret_key: str
:param secret_key: The secret key part of the credentials.
:type token: str
:param token: An option session token used by STS session
credentials.
"""
self._credentials = botocore.credentials.Credentials(access_key,
secret_key,
token)
self._credentials.method = 'explicit'
def get_credentials(self, metadata=None):
"""
Return the :class:`botocore.credential.Credential` object
associated with this session. If the credentials have not
yet been loaded, this will attempt to load them. If they
have already been loaded, this will return the cached
credentials.
:type metadata: dict
:param metadata: This parameter allows you to pass in
EC2 instance metadata containing IAM Role credentials.
This metadata will be used rather than retrieving the
metadata from the metadata service. This is mainly used
for unit testing.
"""
if self._credentials is None:
self._credentials = botocore.credentials.get_credentials(self,
metadata)
return self._credentials
def user_agent(self):
"""
Return a string suitable for use as a User-Agent header.
The string will be of the form:
<agent_name>/<agent_version> Python/<py_ver> <plat_name>/<plat_ver>
Where:
- agent_name is the value of the `user_agent_name` attribute
of the session object (`Boto` by default).
- agent_version is the value of the `user_agent_version`
attribute of the session object (the botocore version by default).
by default.
- py_ver is the version of the Python interpreter beng used.
- plat_name is the name of the platform (e.g. Darwin)
- plat_ver is the version of the platform
"""
return '%s/%s Python/%s %s/%s' % (self.user_agent_name,
self.user_agent_version,
platform.python_version(),
platform.system(),
platform.release())
def get_data(self, data_path):
"""
Retrieve the data associated with `data_path`.
:type data_path: str
:param data_path: The path to the data you wish to retrieve.
"""
return botocore.base.get_data(self, data_path)
def get_service_data(self, service_name):
"""
Retrieve the fully merged data associated with a service.
"""
data_path = '%s/%s' % (self.provider.name, service_name)
service_data = self.get_data(data_path)
return service_data
def get_available_services(self):
"""
Return a list of names of available services.
"""
data_path = '%s' % self.provider.name
return self.get_data(data_path)
def get_service(self, service_name):
"""
Get information about a service.
:type service_name: str
:param service_name: The name of the service (e.g. 'ec2')
:returns: :class:`botocore.service.Service`
"""
service = botocore.service.get_service(self, service_name,
self.provider)
event = self.create_event('service-created')
self._events.emit(event, service=service)
return service
def set_debug_logger(self, logger_name='botocore'):
"""
Convenience function to quickly configure full debug output
to go to the console.
"""
self.set_stream_logger(logger_name, logging.DEBUG)
def set_stream_logger(self, logger_name, log_level, stream=None,
format_string=None):
"""
Convenience method to configure a stream logger.
:type logger_name: str
:param logger_name: The name of the logger to configure
:type log_level: str
:param log_level: The log level to set for the logger. This
is any param supported by the ``.setLevel()`` method of
a ``Log`` object.
:type stream: file
:param stream: A file like object to log to. If none is provided
then sys.stderr will be used.
:type format_string: str
:param format_string: The format string to use for the log
formatter. If none is provided this will default to
``self.FmtString``.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
ch = logging.StreamHandler(stream)
ch.setLevel(log_level)
# create formatter
if format_string is None:
format_string = self.FmtString
formatter = logging.Formatter(format_string)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def set_file_logger(self, log_level, path, logger_name='botocore'):
"""
Convenience function to quickly configure any level of logging
to a file.
:type log_level: int
:param log_level: A log level as specified in the `logging` module
:type path: string
:param path: Path to the log file. The file will be created
if it doesn't already exist.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
# create console handler and set level to debug
ch = logging.FileHandler(path)
ch.setLevel(log_level)
# create formatter
formatter = logging.Formatter(self.FmtString)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def register(self, event_name, handler, unique_id=None):
"""Register a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to invoke when the event
is emitted. This object must be callable, and must
accept ``**kwargs``. If either of these preconditions are
not met, a ``ValueError`` will be raised.
:type unique_id: str
:param unique_id: An optional identifier to associate with the
registration. A unique_id can only be used once for
the entire session registration (unless it is unregistered).
This can be used to prevent an event handler from being
registered twice.
"""
self._events.register(event_name, handler, unique_id)
def unregister(self, event_name, handler=None, unique_id=None):
"""Unregister a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to unregister.
:type unique_id: str
:param unique_id: A unique identifier identifying the callback
to unregister. You can provide either the handler or the
unique_id, you do not have to provide both.
"""
self._events.unregister(event_name, handler=handler,
unique_id=unique_id)
def register_event(self, event_name, fmtstr):
"""
Register a new event. The event will be added to ``AllEvents``
and will then be able to be created using ``create_event``.
:type event_name: str
:param event_name: The base name of the event.
:type fmtstr: str
:param fmtstr: The formatting string for the event.
"""
if event_name not in AllEvents:
AllEvents[event_name] = fmtstr
def create_event(self, event_name, *fmtargs):
"""
Creates a new event string that can then be emitted.
You could just create it manually, since it's just
a string but this helps to define the range of known events.
:type event_name: str
:param event_name: The base name of the new event.
:type fmtargs: tuple
:param fmtargs: A tuple of values that will be used as the
arguments pass to the string formatting operation. The
actual values passed depend on the type of event you
are creating.
"""
if event_name in AllEvents:
fmt_string = AllEvents[event_name]
if fmt_string:
event = event_name + (fmt_string % fmtargs)
else:
event = event_name
return event
raise EventNotFound(event_name=event_name)
def emit(self, event_name, **kwargs):
return self._events.emit(event_name, **kwargs)
def emit_first_non_none_response(self, event_name, **kwargs):
responses = self._events.emit(event_name, **kwargs)
return first_non_none_response(responses)
class TestHierarchicalEventEmitter(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook(self, **kwargs):
self.hook_calls.append(kwargs)
def test_non_dot_behavior(self):
self.emitter.register('no-dot', self.hook)
self.emitter.emit('no-dot')
self.assertEqual(len(self.hook_calls), 1)
def test_with_dots(self):
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
def test_catch_all_hook(self):
self.emitter.register('foo', self.hook)
self.emitter.register('foo.bar', self.hook)
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 3, self.hook_calls)
# The hook is called with the same event name three times.
self.assertEqual([e['event_name'] for e in self.hook_calls],
['foo.bar.baz', 'foo.bar.baz', 'foo.bar.baz'])
def test_hook_called_in_proper_order(self):
# We should call the hooks from most specific to least
# specific.
calls = []
self.emitter.register('foo', lambda **kwargs: calls.append('foo'))
self.emitter.register('foo.bar',
lambda **kwargs: calls.append('foo.bar'))
self.emitter.register('foo.bar.baz',
lambda **kwargs: calls.append('foo.bar.baz'))
self.emitter.emit('foo.bar.baz')
self.assertEqual(calls, ['foo.bar.baz', 'foo.bar', 'foo'])
class Session(object):
"""
The Session object collects together useful functionality
from `botocore` as well as important data such as configuration
information and credentials into a single, easy-to-use object.
:ivar available_profiles: A list of profiles defined in the config
file associated with this session.
:ivar profile: The current profile.
"""
#: A default dictionary that maps the logical names for session variables
#: to the specific environment variables and configuration file names
#: that contain the values for these variables.
#: When creating a new Session object, you can pass in your own dictionary
#: to remap the logical names or to add new logical names. You can then
#: get the current value for these variables by using the
#: ``get_config_variable`` method of the :class:`botocore.session.Session`
#: class.
#: These form the keys of the dictionary. The values in the dictionary
#: are tuples of (<config_name>, <environment variable>, <default value>,
#: <conversion func>).
#: The conversion func is a function that takes the configuration value
#: as an argument and returns the converted value. If this value is
#: None, then the configuration value is returned unmodified. This
#: conversion function can be used to type convert config values to
#: values other than the default values of strings.
#: The ``profile`` and ``config_file`` variables should always have a
#: None value for the first entry in the tuple because it doesn't make
#: sense to look inside the config file for the location of the config
#: file or for the default profile to use.
#: The ``config_name`` is the name to look for in the configuration file,
#: the ``env var`` is the OS environment variable (``os.environ``) to
#: use, and ``default_value`` is the value to use if no value is otherwise
#: found.
SESSION_VARIABLES = {
# logical: config_file, env_var, default_value, conversion_func
'profile': (None, ['AWS_DEFAULT_PROFILE', 'AWS_PROFILE'], None, None),
'region': ('region', 'AWS_DEFAULT_REGION', None, None),
'data_path': ('data_path', 'AWS_DATA_PATH', None, None),
'config_file': (None, 'AWS_CONFIG_FILE', '~/.aws/config', None),
'ca_bundle': ('ca_bundle', 'AWS_CA_BUNDLE', None, None),
# This is the shared credentials file amongst sdks.
'credentials_file':
(None, 'AWS_SHARED_CREDENTIALS_FILE', '~/.aws/credentials', None),
# These variables only exist in the config file.
# This is the number of seconds until we time out a request to
# the instance metadata service.
'metadata_service_timeout':
('metadata_service_timeout', 'AWS_METADATA_SERVICE_TIMEOUT', 1, int),
# This is the number of request attempts we make until we give
# up trying to retrieve data from the instance metadata service.
'metadata_service_num_attempts':
('metadata_service_num_attempts', 'AWS_METADATA_SERVICE_NUM_ATTEMPTS',
1, int),
}
#: The default format string to use when configuring the botocore logger.
LOG_FORMAT = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
def __init__(self,
session_vars=None,
event_hooks=None,
include_builtin_handlers=True,
profile=None):
"""
Create a new Session object.
:type session_vars: dict
:param session_vars: A dictionary that is used to override some or all
of the environment variables associated with this session. The
key/value pairs defined in this dictionary will override the
corresponding variables defined in ``SESSION_VARIABLES``.
:type event_hooks: BaseEventHooks
:param event_hooks: The event hooks object to use. If one is not
provided, an event hooks object will be automatically created
for you.
:type include_builtin_handlers: bool
:param include_builtin_handlers: Indicates whether or not to
automatically register builtin handlers.
:type profile: str
:param profile: The name of the profile to use for this
session. Note that the profile can only be set when
the session is created.
"""
self.session_var_map = copy.copy(self.SESSION_VARIABLES)
if session_vars:
self.session_var_map.update(session_vars)
if event_hooks is None:
self._events = HierarchicalEmitter()
else:
self._events = event_hooks
if include_builtin_handlers:
self._register_builtin_handlers(self._events)
self.user_agent_name = 'Botocore'
self.user_agent_version = __version__
self.user_agent_extra = ''
# The _profile attribute is just used to cache the value
# of the current profile to avoid going through the normal
# config lookup process each access time.
self._profile = None
self._config = None
self._credentials = None
self._profile_map = None
# This is a dict that stores per session specific config variable
# overrides via set_config_variable().
self._session_instance_vars = {}
if profile is not None:
self._session_instance_vars['profile'] = profile
self._client_config = None
self._components = ComponentLocator()
self._register_components()
def _register_components(self):
self._register_credential_provider()
self._register_data_loader()
self._register_endpoint_resolver()
self._register_event_emitter()
self._register_response_parser_factory()
def _register_event_emitter(self):
self._components.register_component('event_emitter', self._events)
def _register_credential_provider(self):
self._components.lazy_register_component(
'credential_provider',
lambda: botocore.credentials.create_credential_resolver(self))
def _register_data_loader(self):
self._components.lazy_register_component(
'data_loader',
lambda: create_loader(self.get_config_variable('data_path')))
def _register_endpoint_resolver(self):
self._components.lazy_register_component(
'endpoint_resolver',
lambda: regions.EndpointResolver(self.get_data('_endpoints')))
def _register_response_parser_factory(self):
self._components.register_component('response_parser_factory',
ResponseParserFactory())
def _register_builtin_handlers(self, events):
for spec in handlers.BUILTIN_HANDLERS:
if len(spec) == 2:
event_name, handler = spec
self.register(event_name, handler)
else:
event_name, handler, register_type = spec
if register_type is handlers.REGISTER_FIRST:
self._events.register_first(event_name, handler)
elif register_type is handlers.REGISTER_LAST:
self._events.register_last(event_name, handler)
@property
def available_profiles(self):
return list(self._build_profile_map().keys())
def _build_profile_map(self):
# This will build the profile map if it has not been created,
# otherwise it will return the cached value. The profile map
# is a list of profile names, to the config values for the profile.
if self._profile_map is None:
self._profile_map = self.full_config['profiles']
return self._profile_map
@property
def profile(self):
if self._profile is None:
profile = self.get_config_variable('profile')
self._profile = profile
return self._profile
def get_config_variable(self,
logical_name,
methods=('instance', 'env', 'config')):
"""
Retrieve the value associated with the specified logical_name
from the environment or the config file. Values found in the
environment variable take precedence of values found in the
config file. If no value can be found, a None will be returned.
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to retrieve. This name will be mapped to the
appropriate environment variable name for this session as
well as the appropriate config file entry.
:type method: tuple
:param method: Defines which methods will be used to find
the variable value. By default, all available methods
are tried but you can limit which methods are used
by supplying a different value to this parameter.
Valid choices are: instance|env|config
:returns: value of variable or None if not defined.
"""
# Handle all the short circuit special cases first.
if logical_name not in self.session_var_map:
return
# Do the actual lookups. We need to handle
# 'instance', 'env', and 'config' locations, in that order.
value = None
var_config = self.session_var_map[logical_name]
if self._found_in_instance_vars(methods, logical_name):
return self._session_instance_vars[logical_name]
elif self._found_in_env(methods, var_config):
value = self._retrieve_from_env(var_config[1], os.environ)
elif self._found_in_config_file(methods, var_config):
value = self.get_scoped_config()[var_config[0]]
if value is None:
value = var_config[2]
if var_config[3] is not None:
value = var_config[3](value)
return value
def _found_in_instance_vars(self, methods, logical_name):
if 'instance' in methods:
return logical_name in self._session_instance_vars
return False
def _found_in_env(self, methods, var_config):
return ('env' in methods
and var_config[1] is not None and self._retrieve_from_env(
var_config[1], os.environ) is not None)
def _found_in_config_file(self, methods, var_config):
if 'config' in methods and var_config[0] is not None:
return var_config[0] in self.get_scoped_config()
return False
def _retrieve_from_env(self, names, environ):
# We need to handle the case where names is either
# a single value or a list of variables.
if not isinstance(names, list):
names = [names]
for name in names:
if name in environ:
return environ[name]
return None
def set_config_variable(self, logical_name, value):
"""Set a configuration variable to a specific value.
By using this method, you can override the normal lookup
process used in ``get_config_variable`` by explicitly setting
a value. Subsequent calls to ``get_config_variable`` will
use the ``value``. This gives you per-session specific
configuration values.
::
>>> # Assume logical name 'foo' maps to env var 'FOO'
>>> os.environ['FOO'] = 'myvalue'
>>> s.get_config_variable('foo')
'myvalue'
>>> s.set_config_variable('foo', 'othervalue')
>>> s.get_config_variable('foo')
'othervalue'
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to set. These are the keys in ``SESSION_VARIABLES``.
:param value: The value to associate with the config variable.
"""
self._session_instance_vars[logical_name] = value
def get_scoped_config(self):
"""
Returns the config values from the config file scoped to the current
profile.
The configuration data is loaded **only** from the config file.
It does not resolve variables based on different locations
(e.g. first from the session instance, then from environment
variables, then from the config file). If you want this lookup
behavior, use the ``get_config_variable`` method instead.
Note that this configuration is specific to a single profile (the
``profile`` session variable).
If the ``profile`` session variable is set and the profile does
not exist in the config file, a ``ProfileNotFound`` exception
will be raised.
:raises: ConfigNotFound, ConfigParseError, ProfileNotFound
:rtype: dict
"""
profile_name = self.get_config_variable('profile')
profile_map = self._build_profile_map()
# If a profile is not explicitly set return the default
# profile config or an empty config dict if we don't have
# a default profile.
if profile_name is None:
return profile_map.get('default', {})
elif profile_name not in profile_map:
# Otherwise if they specified a profile, it has to
# exist (even if it's the default profile) otherwise
# we complain.
raise ProfileNotFound(profile=profile_name)
else:
return profile_map[profile_name]
@property
def full_config(self):
"""Return the parsed config file.
The ``get_config`` method returns the config associated with the
specified profile. This property returns the contents of the
**entire** config file.
:rtype: dict
"""
if self._config is None:
try:
config_file = self.get_config_variable('config_file')
self._config = botocore.config.load_config(config_file)
except ConfigNotFound:
self._config = {'profiles': {}}
try:
# Now we need to inject the profiles from the
# credentials file. We don't actually need the values
# in the creds file, only the profile names so that we
# can validate the user is not referring to a nonexistent
# profile.
cred_file = self.get_config_variable('credentials_file')
cred_profiles = botocore.config.raw_config_parse(cred_file)
for profile in cred_profiles:
cred_vars = cred_profiles[profile]
if profile not in self._config['profiles']:
self._config['profiles'][profile] = cred_vars
else:
self._config['profiles'][profile].update(cred_vars)
except ConfigNotFound:
pass
return self._config
def get_default_client_config(self):
"""Retrieves the default config for creating clients
:rtype: botocore.client.Config
:returns: The default client config object when creating clients. If
the value is ``None`` then there is no default config object
attached to the session.
"""
return self._client_config
def set_default_client_config(self, client_config):
"""Sets the default config for creating clients
:type client_config: botocore.client.Config
:param client_config: The default client config object when creating
clients. If the value is ``None`` then there is no default config
object attached to the session.
"""
self._client_config = client_config
def set_credentials(self, access_key, secret_key, token=None):
"""
Manually create credentials for this session. If you would
prefer to use botocore without a config file, environment variables,
or IAM roles, you can pass explicit credentials into this
method to establish credentials for this session.
:type access_key: str
:param access_key: The access key part of the credentials.
:type secret_key: str
:param secret_key: The secret key part of the credentials.
:type token: str
:param token: An option session token used by STS session
credentials.
"""
self._credentials = botocore.credentials.Credentials(
access_key, secret_key, token)
def get_credentials(self):
"""
Return the :class:`botocore.credential.Credential` object
associated with this session. If the credentials have not
yet been loaded, this will attempt to load them. If they
have already been loaded, this will return the cached
credentials.
"""
if self._credentials is None:
self._credentials = self._components.get_component(
'credential_provider').load_credentials()
return self._credentials
def user_agent(self):
"""
Return a string suitable for use as a User-Agent header.
The string will be of the form:
<agent_name>/<agent_version> Python/<py_ver> <plat_name>/<plat_ver>
Where:
- agent_name is the value of the `user_agent_name` attribute
of the session object (`Boto` by default).
- agent_version is the value of the `user_agent_version`
attribute of the session object (the botocore version by default).
by default.
- py_ver is the version of the Python interpreter beng used.
- plat_name is the name of the platform (e.g. Darwin)
- plat_ver is the version of the platform
If ``user_agent_extra`` is not empty, then this value will be
appended to the end of the user agent string.
"""
base = '%s/%s Python/%s %s/%s' % (
self.user_agent_name, self.user_agent_version,
platform.python_version(), platform.system(), platform.release())
if self.user_agent_extra:
base += ' %s' % self.user_agent_extra
return base
def get_data(self, data_path):
"""
Retrieve the data associated with `data_path`.
:type data_path: str
:param data_path: The path to the data you wish to retrieve.
"""
return self.get_component('data_loader').load_data(data_path)
def get_service_model(self, service_name, api_version=None):
"""Get the service model object.
:type service_name: string
:param service_name: The service name
:type api_version: string
:param api_version: The API version of the service. If none is
provided, then the latest API version will be used.
:rtype: L{botocore.model.ServiceModel}
:return: The botocore service model for the service.
"""
service_description = self.get_service_data(service_name, api_version)
return ServiceModel(service_description, service_name=service_name)
def get_waiter_model(self, service_name, api_version=None):
loader = self.get_component('data_loader')
waiter_config = loader.load_service_model(service_name, 'waiters-2',
api_version)
return waiter.WaiterModel(waiter_config)
def get_paginator_model(self, service_name, api_version=None):
loader = self.get_component('data_loader')
paginator_config = loader.load_service_model(service_name,
'paginators-1',
api_version)
return paginate.PaginatorModel(paginator_config)
def get_service_data(self, service_name, api_version=None):
"""
Retrieve the fully merged data associated with a service.
"""
data_path = service_name
service_data = self.get_component('data_loader').load_service_model(
data_path, type_name='service-2', api_version=api_version)
self._events.emit('service-data-loaded.%s' % service_name,
service_data=service_data,
service_name=service_name,
session=self)
return service_data
def get_available_services(self):
"""
Return a list of names of available services.
"""
return self.get_component('data_loader')\
.list_available_services(type_name='service-2')
def set_debug_logger(self, logger_name='botocore'):
"""
Convenience function to quickly configure full debug output
to go to the console.
"""
self.set_stream_logger(logger_name, logging.DEBUG)
def set_stream_logger(self,
logger_name,
log_level,
stream=None,
format_string=None):
"""
Convenience method to configure a stream logger.
:type logger_name: str
:param logger_name: The name of the logger to configure
:type log_level: str
:param log_level: The log level to set for the logger. This
is any param supported by the ``.setLevel()`` method of
a ``Log`` object.
:type stream: file
:param stream: A file like object to log to. If none is provided
then sys.stderr will be used.
:type format_string: str
:param format_string: The format string to use for the log
formatter. If none is provided this will default to
``self.LOG_FORMAT``.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
ch = logging.StreamHandler(stream)
ch.setLevel(log_level)
# create formatter
if format_string is None:
format_string = self.LOG_FORMAT
formatter = logging.Formatter(format_string)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def set_file_logger(self, log_level, path, logger_name='botocore'):
"""
Convenience function to quickly configure any level of logging
to a file.
:type log_level: int
:param log_level: A log level as specified in the `logging` module
:type path: string
:param path: Path to the log file. The file will be created
if it doesn't already exist.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
# create console handler and set level to debug
ch = logging.FileHandler(path)
ch.setLevel(log_level)
# create formatter
formatter = logging.Formatter(self.LOG_FORMAT)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def register(self,
event_name,
handler,
unique_id=None,
unique_id_uses_count=False):
"""Register a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to invoke when the event
is emitted. This object must be callable, and must
accept ``**kwargs``. If either of these preconditions are
not met, a ``ValueError`` will be raised.
:type unique_id: str
:param unique_id: An optional identifier to associate with the
registration. A unique_id can only be used once for
the entire session registration (unless it is unregistered).
This can be used to prevent an event handler from being
registered twice.
:param unique_id_uses_count: boolean
:param unique_id_uses_count: Specifies if the event should maintain
a count when a ``unique_id`` is registered and unregisted. The
event can only be completely unregistered once every register call
using the unique id has been matched by an ``unregister`` call.
If ``unique_id`` is specified, subsequent ``register``
calls must use the same value for ``unique_id_uses_count``
as the ``register`` call that first registered the event.
:raises ValueError: If the call to ``register`` uses ``unique_id``
but the value for ``unique_id_uses_count`` differs from the
``unique_id_uses_count`` value declared by the very first
``register`` call for that ``unique_id``.
"""
self._events.register(event_name,
handler,
unique_id,
unique_id_uses_count=unique_id_uses_count)
def unregister(self,
event_name,
handler=None,
unique_id=None,
unique_id_uses_count=False):
"""Unregister a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to unregister.
:type unique_id: str
:param unique_id: A unique identifier identifying the callback
to unregister. You can provide either the handler or the
unique_id, you do not have to provide both.
:param unique_id_uses_count: boolean
:param unique_id_uses_count: Specifies if the event should maintain
a count when a ``unique_id`` is registered and unregisted. The
event can only be completely unregistered once every ``register``
call using the ``unique_id`` has been matched by an ``unregister``
call. If the ``unique_id`` is specified, subsequent
``unregister`` calls must use the same value for
``unique_id_uses_count`` as the ``register`` call that first
registered the event.
:raises ValueError: If the call to ``unregister`` uses ``unique_id``
but the value for ``unique_id_uses_count`` differs from the
``unique_id_uses_count`` value declared by the very first
``register`` call for that ``unique_id``.
"""
self._events.unregister(event_name,
handler=handler,
unique_id=unique_id,
unique_id_uses_count=unique_id_uses_count)
def emit(self, event_name, **kwargs):
return self._events.emit(event_name, **kwargs)
def emit_first_non_none_response(self, event_name, **kwargs):
responses = self._events.emit(event_name, **kwargs)
return first_non_none_response(responses)
def get_component(self, name):
return self._components.get_component(name)
def register_component(self, name, component):
self._components.register_component(name, component)
def lazy_register_component(self, name, component):
self._components.lazy_register_component(name, component)
def create_client(self,
service_name,
region_name=None,
api_version=None,
use_ssl=True,
verify=None,
endpoint_url=None,
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None,
config=None):
"""Create a botocore client.
:type service_name: string
:param service_name: The name of the service for which a client will
be created. You can use the ``Sesssion.get_available_services()``
method to get a list of all available service names.
:type region_name: string
:param region_name: The name of the region associated with the client.
A client is associated with a single region.
:type api_version: string
:param api_version: The API version to use. By default, botocore will
use the latest API version when creating a client. You only need
to specify this parameter if you want to use a previous API version
of the client.
:type use_ssl: boolean
:param use_ssl: Whether or not to use SSL. By default, SSL is used.
Note that not all services support non-ssl connections.
:type verify: boolean/string
:param verify: Whether or not to verify SSL certificates.
By default SSL certificates are verified. You can provide the
following values:
* False - do not validate SSL certificates. SSL will still be
used (unless use_ssl is False), but SSL certificates
will not be verified.
* path/to/cert/bundle.pem - A filename of the CA cert bundle to
uses. You can specify this argument if you want to use a
different CA cert bundle than the one used by botocore.
:type endpoint_url: string
:param endpoint_url: The complete URL to use for the constructed
client. Normally, botocore will automatically construct the
appropriate URL to use when communicating with a service. You can
specify a complete URL (including the "http/https" scheme) to
override this behavior. If this value is provided, then
``use_ssl`` is ignored.
:type aws_access_key_id: string
:param aws_access_key_id: The access key to use when creating
the client. This is entirely optional, and if not provided,
the credentials configured for the session will automatically
be used. You only need to provide this argument if you want
to override the credentials used for this specific client.
:type aws_secret_access_key: string
:param aws_secret_access_key: The secret key to use when creating
the client. Same semantics as aws_access_key_id above.
:type aws_session_token: string
:param aws_session_token: The session token to use when creating
the client. Same semantics as aws_access_key_id above.
:type config: botocore.client.Config
:param config: Advanced client configuration options. If a value
is specified in the client config, its value will take precedence
over environment variables and configuration values, but not over
a value passed explicitly to the method. If a default config
object is set on the session, the config object used when creating
the client will be the result of calling ``merge()`` on the
default config with the config provided to this call.
:rtype: botocore.client.BaseClient
:return: A botocore client instance
"""
default_client_config = self.get_default_client_config()
# If a config is provided and a default config is set, then
# use the config resulting from merging the two.
if config is not None and default_client_config is not None:
config = default_client_config.merge(config)
# If a config was not provided then use the default
# client config from the session
elif default_client_config is not None:
config = default_client_config
# Figure out the user-provided region based on the various
# configuration options.
if region_name is None:
if config and config.region_name is not None:
region_name = config.region_name
else:
region_name = self.get_config_variable('region')
# Figure out the verify value base on the various
# configuration options.
if verify is None:
verify = self.get_config_variable('ca_bundle')
loader = self.get_component('data_loader')
event_emitter = self.get_component('event_emitter')
response_parser_factory = self.get_component('response_parser_factory')
if aws_secret_access_key is not None:
credentials = botocore.credentials.Credentials(
access_key=aws_access_key_id,
secret_key=aws_secret_access_key,
token=aws_session_token)
else:
credentials = self.get_credentials()
endpoint_resolver = self.get_component('endpoint_resolver')
client_creator = botocore.client.ClientCreator(
loader, endpoint_resolver, self.user_agent(), event_emitter,
retryhandler, translate, response_parser_factory)
client = client_creator.create_client(
service_name=service_name,
region_name=region_name,
is_secure=use_ssl,
endpoint_url=endpoint_url,
verify=verify,
credentials=credentials,
scoped_config=self.get_scoped_config(),
client_config=config,
api_version=api_version)
return client
class TestWildcardHandlers(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook(self, **kwargs):
self.hook_calls.append(kwargs)
def register(self, event_name):
func = partial(self.hook, registered_with=event_name)
self.emitter.register(event_name, func)
return func
def assert_hook_is_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after > starting:
self.fail("Handler was not called for event: %s" % event)
self.assertEqual(self.hook_calls[-1]['event_name'], event)
def assert_hook_is_not_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after == starting:
self.fail("Handler was called for event but was not "
"suppose to be called: %s, last_event: %s" %
(event, self.hook_calls[-1]))
def test_one_level_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
# Also register for a number of other events to check
# for false positives.
self.emitter.register('other.bar.baz', self.hook)
self.emitter.register('qqq.baz', self.hook)
self.emitter.register('dont.call.me', self.hook)
self.emitter.register('dont', self.hook)
# These calls should trigger our hook.
self.assert_hook_is_called_given_event('foo.bar.baz')
self.assert_hook_is_called_given_event('foo.qux.baz')
self.assert_hook_is_called_given_event('foo.anything.baz')
# These calls should not match our hook.
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('bar.qux.baz')
self.assert_hook_is_not_called_given_event('foo-bar')
def test_hierarchical_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_called_given_event('foo.bar.baz.qux.foo')
self.assert_hook_is_called_given_event('foo.qux.baz.qux')
self.assert_hook_is_called_given_event('foo.qux.baz.qux.foo')
self.assert_hook_is_not_called_given_event('bar.qux.baz.foo')
def test_multiple_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.ANY.THING.baz')
self.assert_hook_is_called_given_event('foo.AT.ALL.baz')
# More specific than what we registered for.
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra')
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra.stuff')
# Too short:
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
# Bad ending segment.
self.assert_hook_is_not_called_given_event('foo.ANY.THING.notbaz')
self.assert_hook_is_not_called_given_event('foo.ANY.THING.stillnotbaz')
def test_can_unregister_for_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
# Call multiple times to verify caching behavior.
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
def test_unregister_does_not_exist(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_cache_cleared_properly(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.bar', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_complicated_register_unregister(self):
r = self.emitter.register
u = partial(self.emitter.unregister, handler=self.hook)
r('foo.bar.baz.qux', self.hook)
r('foo.bar.baz', self.hook)
r('foo.bar', self.hook)
r('foo', self.hook)
u('foo.bar.baz')
u('foo')
u('foo.bar')
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo')
def test_register_multiple_handlers_for_same_event(self):
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
def test_register_with_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# Since we're using the same unique_id, this registration is ignored.
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# This also works across event names, so this registration is ignored
# as well.
self.emitter.register('foo.other', self.hook, unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.emit('foo.other')
self.assertEqual(len(self.hook_calls), 0)
def test_remove_handler_with_unique_id(self):
hook2 = lambda **kwargs: self.hook_calls.append(kwargs)
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
# Reset the hook calls.
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
# Can provide the unique_id to unregister.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
# Same as with not specifying a unique_id, you can call
# unregister multiple times and not get an exception.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
def test_remove_handler_with_and_without_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
class Session(object):
"""
The Session object collects together useful functionality
from `botocore` as well as important data such as configuration
information and credentials into a single, easy-to-use object.
:ivar available_profiles: A list of profiles defined in the config
file associated with this session.
:ivar profile: The current profile.
"""
AllEvents = {
'after-call': '.%s.%s',
'after-parsed': '.%s.%s.%s.%s',
'before-parameter-build': '.%s.%s',
'before-call': '.%s.%s',
'service-created': '',
'service-data-loaded': '.%s',
'creating-endpoint': '.%s',
'before-auth': '.%s',
'needs-retry': '.%s.%s',
}
"""
A dictionary where each key is an event name and the value
is the formatting string used to construct a new event.
"""
SessionVariables = {
# logical: config_file, env_var, default_value
'profile': (None, 'BOTO_DEFAULT_PROFILE', None),
'region': ('region', 'BOTO_DEFAULT_REGION', None),
'data_path': ('data_path', 'BOTO_DATA_PATH', None),
'config_file': (None, 'AWS_CONFIG_FILE', '~/.aws/config'),
'access_key': ('aws_access_key_id', 'AWS_ACCESS_KEY_ID', None),
'secret_key': ('aws_secret_access_key', 'AWS_SECRET_ACCESS_KEY', None),
'token': ('aws_security_token', 'AWS_SECURITY_TOKEN', None),
'provider': ('provider', 'BOTO_PROVIDER_NAME', 'aws'),
# These variables only exist in the config file.
# This is the number of seconds until we time out a request to
# the instance metadata service.
'metadata_service_timeout': ('metadata_service_timeout', None, None),
# This is the number of request attempts we make until we give
# up trying to retrieve data from the instance metadata service.
'metadata_service_num_attempts': ('metadata_service_num_attempts',
None, None),
}
"""
A default dictionary that maps the logical names for session variables
to the specific environment variables and configuration file names
that contain the values for these variables.
When creating a new Session object, you can pass in your own dictionary to
remap the logical names or to add new logical names. You can then get the
current value for these variables by using the ``get_config_variable``
method of the :class:`botocore.session.Session` class.
The default set of logical variable names are:
* profile - Default profile name you want to use.
* region - Default region name to use, if not otherwise specified.
* data_path - Additional directories to search for data files.
* config_file - Location of a Boto config file.
* access_key - The AWS access key part of your credentials.
* secret_key - The AWS secret key part of your credentials.
* token - The security token part of your credentials (session tokens only)
* provider - The name of the service provider (e.g. aws)
These form the keys of the dictionary. The values in the dictionary
are tuples of (<config_name>, <environment variable>, <default value).
The ``profile`` and ``config_file`` variables should always have a
None value for the first entry in the tuple because it doesn't make
sense to look inside the config file for the location of the config
file or for the default profile to use.
The ``config_name`` is the name to look for in the configuration file,
the ``env var`` is the OS environment variable (``os.environ``) to
use, and ``default_value`` is the value to use if no value is otherwise
found.
"""
FmtString = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
def __init__(self, session_vars=None, event_hooks=None,
include_builtin_handlers=True, loader=None):
"""
Create a new Session object.
:type session_vars: dict
:param session_vars: A dictionary that is used to override some or all
of the environment variables associated with this session. The
key/value pairs defined in this dictionary will override the
corresponding variables defined in ``SessionVariables``.
:type event_hooks: BaseEventHooks
:param event_hooks: The event hooks object to use. If one is not
provided, an event hooks object will be automatically created
for you.
:type include_builtin_handlers: bool
:param include_builtin_handlers: Indicates whether or not to
automatically register builtin handlers.
"""
self.session_var_map = copy.copy(self.SessionVariables)
if session_vars:
self.session_var_map.update(session_vars)
if event_hooks is None:
self._events = HierarchicalEmitter()
else:
self._events = event_hooks
if include_builtin_handlers:
self._register_builtin_handlers(self._events)
self.user_agent_name = 'Botocore'
self.user_agent_version = __version__
self.user_agent_extra = ''
self._profile = None
self._config = None
self._credentials = None
self._profile_map = None
self._provider = None
# This is a dict that stores per session specific config variable
# overrides via set_config_variable().
self._session_instance_vars = {}
if loader is None:
loader = Loader()
self._loader = loader
# _data_paths_added is used to track whether or not we added
# extra paths to the loader. We will do this lazily
# only when we ask for the loader.
self._data_paths_added = False
@property
def loader(self):
if not self._data_paths_added:
extra_paths = self.get_variable('data_path')
if extra_paths is not None:
self._loader.data_path = extra_paths
self._data_paths_added = True
return self._loader
def _register_builtin_handlers(self, events):
for event_name, handler in handlers.BUILTIN_HANDLERS:
self.register(event_name, handler)
@property
def provider(self):
if self._provider is None:
self._provider = get_provider(
self, self.get_config_variable('provider'))
return self._provider
@property
def available_profiles(self):
return list(self._build_profile_map().keys())
def _build_profile_map(self):
# This will build the profile map if it has not been created,
# otherwise it will return the cached value. The profile map
# is a list of profile names, to the config values for the profile.
if self._profile_map is None:
profile_map = {}
for key, values in self.full_config.items():
if key.startswith("profile"):
try:
parts = shlex.split(key)
except ValueError:
continue
if len(parts) == 2:
profile_map[parts[1]] = values
elif key == 'default':
# default section is special and is considered a profile
# name but we don't require you use 'profile "default"'
# as a section.
profile_map[key] = values
self._profile_map = profile_map
return self._profile_map
@property
def profile(self):
return self._profile
@profile.setter
def profile(self, profile):
# Since provider can be specified in profile, changing the
# profile should reset the provider.
self._provider = None
self._profile = profile
def get_config_variable(self, logical_name,
methods=('instance', 'env', 'config'),
default=None):
"""
Retrieve the value associated with the specified logical_name
from the environment or the config file. Values found in the
environment variable take precedence of values found in the
config file. If no value can be found, a None will be returned.
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to retrieve. This name will be mapped to the
appropriate environment variable name for this session as
well as the appropriate config file entry.
:type method: tuple
:param method: Defines which methods will be used to find
the variable value. By default, all available methods
are tried but you can limit which methods are used
by supplying a different value to this parameter.
Valid choices are: instance|env|config
:param default: The default value to return if there is no
value associated with the config file. This value will
override any default value specified in ``SessionVariables``.
:returns: str value of variable of None if not defined.
"""
value = None
# There's two types of defaults here. One if the
# default value specified in the SessionVariables.
# The second is an explicit default value passed into this
# function (the default parameter).
# config_default is tracking the default value specified
# in the SessionVariables.
config_default = None
if logical_name in self.session_var_map:
# Short circuit case, check if the var has been explicitly
# overriden via set_config_variable.
if 'instance' in methods and \
logical_name in self._session_instance_vars:
return self._session_instance_vars[logical_name]
config_name, envvar_name, config_default = self.session_var_map[
logical_name]
if logical_name in ('config_file', 'profile'):
config_name = None
if logical_name == 'profile' and self._profile:
value = self._profile
elif 'env' in methods and envvar_name and envvar_name in os.environ:
value = os.environ[envvar_name]
elif 'config' in methods:
if config_name:
config = self.get_config()
value = config.get(config_name)
# If we don't have a value at this point, we need to try to assign
# a default value. An explicit default argument will win over the
# default value from SessionVariables.
if value is None and default is not None:
value = default
if value is None and config_default is not None:
value = config_default
return value
# Alias to get_variable for backwards compatability.
get_variable = get_config_variable
def set_config_variable(self, logical_name, value):
"""Set a configuration variable to a specific value.
By using this method, you can override the normal lookup
process used in ``get_config_variable`` by explicitly setting
a value. Subsequent calls to ``get_config_variable`` will
use the ``value``. This gives you per-session specific
configuration values.
::
>>> # Assume logical name 'foo' maps to env var 'FOO'
>>> os.environ['FOO'] = 'myvalue'
>>> s.get_config_variable('foo')
'myvalue'
>>> s.set_config_variable('foo', 'othervalue')
>>> s.get_config_variable('foo')
'othervalue'
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to set. These are the keys in ``SessionVariables``.
:param value: The value to associate with the config variable.
"""
self._session_instance_vars[logical_name] = value
def get_config(self):
"""
Returns the configuration associated with this session. If
the configuration has not yet been loaded, it will be loaded
using the default ``profile`` session variable. If it has already been
loaded, the cached configuration will be returned.
The configuration data is loaded **only** from the config file.
It does not resolve variables based on different locations
(e.g. first from the session instance, then from environment
variables, then from the config file). If you want this lookup
behavior, use the ``get_config_variable`` method instead.
Note that this configuration is specific to a single profile (the
``profile`` session variable).
If the ``profile`` session variable is set and the profile does
not exist in the config file, a ``ProfileNotFound`` exception
will be raised.
:raises: ConfigNotFound, ConfigParseError, ProfileNotFound
:rtype: dict
"""
profile_name = self.get_config_variable('profile')
profile_map = self._build_profile_map()
# If a profile is not explicitly set return the default
# profile config or an empty config dict if we don't have
# a default profile.
if profile_name is None:
return profile_map.get('default', {})
elif profile_name not in profile_map:
# Otherwise if they specified a profile, it has to
# exist (even if it's the default profile) otherwise
# we complain.
raise ProfileNotFound(profile=profile_name)
else:
return profile_map[profile_name]
@property
def full_config(self):
"""Return the parsed config file.
The ``get_config`` method returns the config associated with the
specified profile. This property returns the contents of the
**entire** config file.
:rtype: dict
"""
if self._config is None:
try:
self._config = botocore.config.get_config(self)
except ConfigNotFound:
self._config = {}
return self._config
def set_credentials(self, access_key, secret_key, token=None):
"""
Manually create credentials for this session. If you would
prefer to use botocore without a config file, environment variables,
or IAM roles, you can pass explicit credentials into this
method to establish credentials for this session.
:type access_key: str
:param access_key: The access key part of the credentials.
:type secret_key: str
:param secret_key: The secret key part of the credentials.
:type token: str
:param token: An option session token used by STS session
credentials.
"""
self._credentials = botocore.credentials.Credentials(access_key,
secret_key,
token)
def get_credentials(self):
"""
Return the :class:`botocore.credential.Credential` object
associated with this session. If the credentials have not
yet been loaded, this will attempt to load them. If they
have already been loaded, this will return the cached
credentials.
"""
if self._credentials is None:
self._credentials = botocore.credentials.get_credentials(self)
return self._credentials
def user_agent(self):
"""
Return a string suitable for use as a User-Agent header.
The string will be of the form:
<agent_name>/<agent_version> Python/<py_ver> <plat_name>/<plat_ver>
Where:
- agent_name is the value of the `user_agent_name` attribute
of the session object (`Boto` by default).
- agent_version is the value of the `user_agent_version`
attribute of the session object (the botocore version by default).
by default.
- py_ver is the version of the Python interpreter beng used.
- plat_name is the name of the platform (e.g. Darwin)
- plat_ver is the version of the platform
If ``user_agent_extra`` is not empty, then this value will be
appended to the end of the user agent string.
"""
base = '%s/%s Python/%s %s/%s' % (self.user_agent_name,
self.user_agent_version,
platform.python_version(),
platform.system(),
platform.release())
if self.user_agent_extra:
base += ' %s' % self.user_agent_extra
return base
def get_data(self, data_path):
"""
Retrieve the data associated with `data_path`.
:type data_path: str
:param data_path: The path to the data you wish to retrieve.
"""
return self.loader.load_data(data_path)
def get_service_data(self, service_name, api_version=None):
"""
Retrieve the fully merged data associated with a service.
"""
data_path = '%s/%s' % (self.provider.name, service_name)
service_data = self.loader.load_service_model(
data_path,
api_version=api_version
)
event_name = self.create_event('service-data-loaded', service_name)
self._events.emit(event_name, service_data=service_data,
service_name=service_name, session=self)
return service_data
def get_available_services(self):
"""
Return a list of names of available services.
"""
data_path = '%s' % self.provider.name
return self.loader.list_available_services(data_path)
def get_service(self, service_name, api_version=None):
"""
Get information about a service.
:type service_name: str
:param service_name: The name of the service (e.g. 'ec2')
:returns: :class:`botocore.service.Service`
"""
service = botocore.service.get_service(self, service_name,
self.provider,
api_version=api_version)
event = self.create_event('service-created')
self._events.emit(event, service=service)
return service
def set_debug_logger(self, logger_name='botocore'):
"""
Convenience function to quickly configure full debug output
to go to the console.
"""
self.set_stream_logger(logger_name, logging.DEBUG)
def set_stream_logger(self, logger_name, log_level, stream=None,
format_string=None):
"""
Convenience method to configure a stream logger.
:type logger_name: str
:param logger_name: The name of the logger to configure
:type log_level: str
:param log_level: The log level to set for the logger. This
is any param supported by the ``.setLevel()`` method of
a ``Log`` object.
:type stream: file
:param stream: A file like object to log to. If none is provided
then sys.stderr will be used.
:type format_string: str
:param format_string: The format string to use for the log
formatter. If none is provided this will default to
``self.FmtString``.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
ch = logging.StreamHandler(stream)
ch.setLevel(log_level)
# create formatter
if format_string is None:
format_string = self.FmtString
formatter = logging.Formatter(format_string)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def set_file_logger(self, log_level, path, logger_name='botocore'):
"""
Convenience function to quickly configure any level of logging
to a file.
:type log_level: int
:param log_level: A log level as specified in the `logging` module
:type path: string
:param path: Path to the log file. The file will be created
if it doesn't already exist.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
# create console handler and set level to debug
ch = logging.FileHandler(path)
ch.setLevel(log_level)
# create formatter
formatter = logging.Formatter(self.FmtString)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def register(self, event_name, handler, unique_id=None):
"""Register a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to invoke when the event
is emitted. This object must be callable, and must
accept ``**kwargs``. If either of these preconditions are
not met, a ``ValueError`` will be raised.
:type unique_id: str
:param unique_id: An optional identifier to associate with the
registration. A unique_id can only be used once for
the entire session registration (unless it is unregistered).
This can be used to prevent an event handler from being
registered twice.
"""
self._events.register(event_name, handler, unique_id)
def unregister(self, event_name, handler=None, unique_id=None):
"""Unregister a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to unregister.
:type unique_id: str
:param unique_id: A unique identifier identifying the callback
to unregister. You can provide either the handler or the
unique_id, you do not have to provide both.
"""
self._events.unregister(event_name, handler=handler,
unique_id=unique_id)
def register_event(self, event_name, fmtstr):
"""
Register a new event. The event will be added to ``AllEvents``
and will then be able to be created using ``create_event``.
:type event_name: str
:param event_name: The base name of the event.
:type fmtstr: str
:param fmtstr: The formatting string for the event.
"""
if event_name not in self.AllEvents:
self.AllEvents[event_name] = fmtstr
def create_event(self, event_name, *fmtargs):
"""
Creates a new event string that can then be emitted.
You could just create it manually, since it's just
a string but this helps to define the range of known events.
:type event_name: str
:param event_name: The base name of the new event.
:type fmtargs: tuple
:param fmtargs: A tuple of values that will be used as the
arguments pass to the string formatting operation. The
actual values passed depend on the type of event you
are creating.
"""
if event_name in self.AllEvents:
fmt_string = self.AllEvents[event_name]
if fmt_string:
event = event_name + (fmt_string % fmtargs)
else:
event = event_name
return event
raise EventNotFound(event_name=event_name)
def emit(self, event_name, **kwargs):
return self._events.emit(event_name, **kwargs)
def emit_first_non_none_response(self, event_name, **kwargs):
responses = self._events.emit(event_name, **kwargs)
return first_non_none_response(responses)
class TestWildcardHandlers(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook(self, **kwargs):
self.hook_calls.append(kwargs)
def register(self, event_name):
func = partial(self.hook, registered_with=event_name)
self.emitter.register(event_name, func)
return func
def assert_hook_is_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after > starting:
self.fail("Handler was not called for event: %s" % event)
self.assertEqual(self.hook_calls[-1]['event_name'], event)
def assert_hook_is_not_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after == starting:
self.fail("Handler was called for event but was not "
"suppose to be called: %s, last_event: %s" %
(event, self.hook_calls[-1]))
def test_one_level_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
# Also register for a number of other events to check
# for false positives.
self.emitter.register('other.bar.baz', self.hook)
self.emitter.register('qqq.baz', self.hook)
self.emitter.register('dont.call.me', self.hook)
self.emitter.register('dont', self.hook)
# These calls should trigger our hook.
self.assert_hook_is_called_given_event('foo.bar.baz')
self.assert_hook_is_called_given_event('foo.qux.baz')
self.assert_hook_is_called_given_event('foo.anything.baz')
# These calls should not match our hook.
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('bar.qux.baz')
self.assert_hook_is_not_called_given_event('foo-bar')
def test_hierarchical_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_called_given_event('foo.bar.baz.qux.foo')
self.assert_hook_is_called_given_event('foo.qux.baz.qux')
self.assert_hook_is_called_given_event('foo.qux.baz.qux.foo')
self.assert_hook_is_not_called_given_event('bar.qux.baz.foo')
def test_multiple_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.ANY.THING.baz')
self.assert_hook_is_called_given_event('foo.AT.ALL.baz')
# More specific than what we registered for.
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra')
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra.stuff')
# Too short:
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
# Bad ending segment.
self.assert_hook_is_not_called_given_event('foo.ANY.THING.notbaz')
self.assert_hook_is_not_called_given_event('foo.ANY.THING.stillnotbaz')
def test_can_unregister_for_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
# Call multiple times to verify caching behavior.
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
def test_unregister_does_not_exist(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_cache_cleared_properly(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.bar', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_complicated_register_unregister(self):
r = self.emitter.register
u = partial(self.emitter.unregister, handler=self.hook)
r('foo.bar.baz.qux', self.hook)
r('foo.bar.baz', self.hook)
r('foo.bar', self.hook)
r('foo', self.hook)
u('foo.bar.baz')
u('foo')
u('foo.bar')
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo')
def test_register_multiple_handlers_for_same_event(self):
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
class TestWildcardHandlers(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook(self, **kwargs):
self.hook_calls.append(kwargs)
def register(self, event_name):
func = partial(self.hook, registered_with=event_name)
self.emitter.register(event_name, func)
return func
def assert_hook_is_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after > starting:
self.fail("Handler was not called for event: %s" % event)
self.assertEqual(self.hook_calls[-1]['event_name'], event)
def assert_hook_is_not_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after == starting:
self.fail("Handler was called for event but was not "
"suppose to be called: %s, last_event: %s" %
(event, self.hook_calls[-1]))
def test_one_level_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
# Also register for a number of other events to check
# for false positives.
self.emitter.register('other.bar.baz', self.hook)
self.emitter.register('qqq.baz', self.hook)
self.emitter.register('dont.call.me', self.hook)
self.emitter.register('dont', self.hook)
# These calls should trigger our hook.
self.assert_hook_is_called_given_event('foo.bar.baz')
self.assert_hook_is_called_given_event('foo.qux.baz')
self.assert_hook_is_called_given_event('foo.anything.baz')
# These calls should not match our hook.
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('bar.qux.baz')
self.assert_hook_is_not_called_given_event('foo-bar')
def test_hierarchical_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_called_given_event('foo.bar.baz.qux.foo')
self.assert_hook_is_called_given_event('foo.qux.baz.qux')
self.assert_hook_is_called_given_event('foo.qux.baz.qux.foo')
self.assert_hook_is_not_called_given_event('bar.qux.baz.foo')
def test_multiple_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.ANY.THING.baz')
self.assert_hook_is_called_given_event('foo.AT.ALL.baz')
# More specific than what we registered for.
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra')
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra.stuff')
# Too short:
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
# Bad ending segment.
self.assert_hook_is_not_called_given_event('foo.ANY.THING.notbaz')
self.assert_hook_is_not_called_given_event('foo.ANY.THING.stillnotbaz')
def test_can_unregister_for_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
# Call multiple times to verify caching behavior.
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
def test_unregister_does_not_exist(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_cache_cleared_properly(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.bar', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_complicated_register_unregister(self):
r = self.emitter.register
u = partial(self.emitter.unregister, handler=self.hook)
r('foo.bar.baz.qux', self.hook)
r('foo.bar.baz', self.hook)
r('foo.bar', self.hook)
r('foo', self.hook)
u('foo.bar.baz')
u('foo')
u('foo.bar')
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo')
def test_register_multiple_handlers_for_same_event(self):
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
def test_register_with_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# Since we're using the same unique_id, this registration is ignored.
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# This also works across event names, so this registration is ignored
# as well.
self.emitter.register('foo.other', self.hook, unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.emit('foo.other')
self.assertEqual(len(self.hook_calls), 0)
def test_remove_handler_with_unique_id(self):
hook2 = lambda **kwargs: self.hook_calls.append(kwargs)
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
# Reset the hook calls.
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
# Can provide the unique_id to unregister.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
# Same as with not specifying a unique_id, you can call
# unregister multiple times and not get an exception.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
def test_remove_handler_with_and_without_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
def test_register_with_uses_count_initially(self):
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Subsequent calls must set ``unique_id_uses_count`` to True.
with self.assertRaises(ValueError):
self.emitter.register('foo', self.hook, unique_id='foo')
def test_register_with_uses_count_not_initially(self):
self.emitter.register('foo', self.hook, unique_id='foo')
# Subsequent calls must set ``unique_id_uses_count`` to False.
with self.assertRaises(ValueError):
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
def test_register_with_uses_count_unregister(self):
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
self.emitter.register('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Event was registered to use a count so it must be specified
# that a count is used when unregistering
with self.assertRaises(ValueError):
self.emitter.unregister('foo', self.hook, unique_id='foo')
# Event should not have been unregistered.
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 1)
self.emitter.unregister('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Event still should not be unregistered.
self.hook_calls = []
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 1)
self.emitter.unregister('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
# Now the event should be unregistered.
self.hook_calls = []
self.emitter.emit('foo')
self.assertEqual(len(self.hook_calls), 0)
def test_register_with_no_uses_count_unregister(self):
self.emitter.register('foo', self.hook, unique_id='foo')
# The event was not registered to use a count initially
with self.assertRaises(ValueError):
self.emitter.unregister('foo', self.hook, unique_id='foo',
unique_id_uses_count=True)
def test_handlers_called_in_order(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register('foo', partial(handler, call_number=1))
self.emitter.register('foo', partial(handler, call_number=2))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2])
def test_handler_call_order_with_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
# We go from most specific to least specific, and each level is called
# in the order they were registered for that particular hierarchy
# level.
self.emitter.register('foo.bar.baz', partial(handler, call_number=1))
self.emitter.register('foo.bar', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.register('foo.bar.baz', partial(handler, call_number=2))
self.emitter.register('foo.bar', partial(handler, call_number=4))
self.emitter.register('foo', partial(handler, call_number=6))
self.emitter.emit('foo.bar.baz')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5, 6])
def test_register_first_single_level(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
# Handlers registered through register_first() are always called
# before handlers registered with register().
self.emitter.register('foo', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=4))
self.emitter.register_first('foo', partial(handler, call_number=1))
self.emitter.register_first('foo', partial(handler, call_number=2))
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5])
def test_register_first_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register('foo', partial(handler, call_number=5))
self.emitter.register('foo.bar', partial(handler, call_number=2))
self.emitter.register_first('foo', partial(handler, call_number=4))
self.emitter.register_first('foo.bar', partial(handler, call_number=1))
self.emitter.register('foo', partial(handler, call_number=6))
self.emitter.register('foo.bar', partial(handler, call_number=3))
self.emitter.emit('foo.bar')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3, 4, 5, 6])
def test_register_last_hierarchy(self):
def handler(call_number, **kwargs):
kwargs['call_number'] = call_number
self.hook_calls.append(kwargs)
self.emitter.register_last('foo', partial(handler, call_number=3))
self.emitter.register('foo', partial(handler, call_number=2))
self.emitter.register_first('foo', partial(handler, call_number=1))
self.emitter.emit('foo')
self.assertEqual([k['call_number'] for k in self.hook_calls],
[1, 2, 3])
def test_register_unregister_first_last(self):
self.emitter.register('foo', self.hook)
self.emitter.register_last('foo.bar', self.hook)
self.emitter.register_first('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar', self.hook)
self.emitter.unregister('foo', self.hook)
self.emitter.emit('foo')
self.assertEqual(self.hook_calls, [])
def test_copy_emitter(self):
# Here we're not testing copy directly, we're testing
# the observable behavior from copying an event emitter.
first = []
def first_handler(id_name, **kwargs):
first.append(id_name)
second = []
def second_handler(id_name, **kwargs):
second.append(id_name)
self.emitter.register('foo.bar.baz', first_handler)
# First time we emit, only the first handler should be called.
self.emitter.emit('foo.bar.baz', id_name='first-time')
self.assertEqual(first, ['first-time'])
self.assertEqual(second, [])
copied_emitter = copy.copy(self.emitter)
# If we emit from the copied emitter, we should still
# only see the first handler called.
copied_emitter.emit('foo.bar.baz', id_name='second-time')
self.assertEqual(first, ['first-time', 'second-time'])
self.assertEqual(second, [])
# However, if we register an event handler with the copied
# emitter, the first emitter will not see this.
copied_emitter.register('foo.bar.baz', second_handler)
copied_emitter.emit('foo.bar.baz', id_name='third-time')
self.assertEqual(first, ['first-time', 'second-time', 'third-time'])
# And now the second handler is called.
self.assertEqual(second, ['third-time'])
# And vice-versa, emitting from the original emitter
# will not trigger the second_handler.
# We'll double check this by unregistering/re-registering
# the event handler.
self.emitter.unregister('foo.bar.baz', first_handler)
self.emitter.register('foo.bar.baz', first_handler)
self.emitter.emit('foo.bar.baz', id_name='last-time')
self.assertEqual(second, ['third-time'])
def test_copy_emitter_with_unique_id_event(self):
# Here we're not testing copy directly, we're testing
# the observable behavior from copying an event emitter.
first = []
def first_handler(id_name, **kwargs):
first.append(id_name)
second = []
def second_handler(id_name, **kwargs):
second.append(id_name)
self.emitter.register('foo', first_handler, 'bar')
self.emitter.emit('foo', id_name='first-time')
self.assertEqual(first, ['first-time'])
self.assertEqual(second, [])
copied_emitter = copy.copy(self.emitter)
# If we register an event handler with the copied
# emitter, the event should not get registered again
# because the unique id was already used.
copied_emitter.register('foo', second_handler, 'bar')
copied_emitter.emit('foo', id_name='second-time')
self.assertEqual(first, ['first-time', 'second-time'])
self.assertEqual(second, [])
# If we unregister the first event from the copied emitter,
# We should be able to register the second handler.
copied_emitter.unregister('foo', first_handler, 'bar')
copied_emitter.register('foo', second_handler, 'bar')
copied_emitter.emit('foo', id_name='third-time')
self.assertEqual(first, ['first-time', 'second-time'])
self.assertEqual(second, ['third-time'])
# The original event emitter should have the unique id event still
# registered though.
self.emitter.emit('foo', id_name='fourth-time')
self.assertEqual(first, ['first-time', 'second-time', 'fourth-time'])
self.assertEqual(second, ['third-time'])
def test_copy_events_with_partials(self):
# There's a bug in python2.6 where you can't deepcopy
# a partial object. We want to ensure that doesn't
# break when a partial is hooked up as an event handler.
def handler(a, b, **kwargs):
return b
f = functools.partial(handler, 1)
self.emitter.register('a.b', f)
copied = copy.copy(self.emitter)
self.assertEqual(copied.emit_until_response(
'a.b', b='return-val')[1], 'return-val')
class TestWildcardHandlers(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook(self, **kwargs):
self.hook_calls.append(kwargs)
def register(self, event_name):
func = partial(self.hook, registered_with=event_name)
self.emitter.register(event_name, func)
return func
def assert_hook_is_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after > starting:
self.fail("Handler was not called for event: %s" % event)
self.assertEqual(self.hook_calls[-1]['event_name'], event)
def assert_hook_is_not_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after == starting:
self.fail("Handler was called for event but was not "
"suppose to be called: %s, last_event: %s" %
(event, self.hook_calls[-1]))
def test_one_level_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
# Also register for a number of other events to check
# for false positives.
self.emitter.register('other.bar.baz', self.hook)
self.emitter.register('qqq.baz', self.hook)
self.emitter.register('dont.call.me', self.hook)
self.emitter.register('dont', self.hook)
# These calls should trigger our hook.
self.assert_hook_is_called_given_event('foo.bar.baz')
self.assert_hook_is_called_given_event('foo.qux.baz')
self.assert_hook_is_called_given_event('foo.anything.baz')
# These calls should not match our hook.
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('bar.qux.baz')
self.assert_hook_is_not_called_given_event('foo-bar')
def test_hierarchical_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_called_given_event('foo.bar.baz.qux.foo')
self.assert_hook_is_called_given_event('foo.qux.baz.qux')
self.assert_hook_is_called_given_event('foo.qux.baz.qux.foo')
self.assert_hook_is_not_called_given_event('bar.qux.baz.foo')
def test_multiple_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.ANY.THING.baz')
self.assert_hook_is_called_given_event('foo.AT.ALL.baz')
# More specific than what we registered for.
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra')
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra.stuff')
# Too short:
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
# Bad ending segment.
self.assert_hook_is_not_called_given_event('foo.ANY.THING.notbaz')
self.assert_hook_is_not_called_given_event('foo.ANY.THING.stillnotbaz')
def test_can_unregister_for_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
# Call multiple times to verify caching behavior.
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
def test_unregister_does_not_exist(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_cache_cleared_properly(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.bar', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_complicated_register_unregister(self):
r = self.emitter.register
u = partial(self.emitter.unregister, handler=self.hook)
r('foo.bar.baz.qux', self.hook)
r('foo.bar.baz', self.hook)
r('foo.bar', self.hook)
r('foo', self.hook)
u('foo.bar.baz')
u('foo')
u('foo.bar')
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo')
def test_register_multiple_handlers_for_same_event(self):
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
def test_register_with_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# Since we're using the same unique_id, this registration is ignored.
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
# This also works across event names, so this registration is ignored
# as well.
self.emitter.register('foo.other', self.hook, unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.emit('foo.other')
self.assertEqual(len(self.hook_calls), 0)
def test_remove_handler_with_unique_id(self):
hook2 = lambda **kwargs: self.hook_calls.append(kwargs)
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)
# Reset the hook calls.
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', hook2)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
# Can provide the unique_id to unregister.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
# Same as with not specifying a unique_id, you can call
# unregister multiple times and not get an exception.
self.emitter.unregister('foo.bar.baz', unique_id='foo')
def test_remove_handler_with_and_without_unique_id(self):
self.emitter.register('foo.bar.baz', self.hook, unique_id='foo')
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 1)
self.hook_calls = []
self.emitter.unregister('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 0)
class Session(object):
"""
The Session object collects together useful functionality
from `botocore` as well as important data such as configuration
information and credentials into a single, easy-to-use object.
:ivar available_profiles: A list of profiles defined in the config
file associated with this session.
:ivar profile: The current profile.
"""
AllEvents = {
'after-call': '.%s.%s',
'after-parsed': '.%s.%s.%s.%s',
'before-parameter-build': '.%s.%s',
'before-call': '.%s.%s',
'service-created': '',
'service-data-loaded': '.%s',
'creating-endpoint': '.%s',
'before-auth': '.%s',
'needs-retry': '.%s.%s',
}
"""
A dictionary where each key is an event name and the value
is the formatting string used to construct a new event.
"""
SessionVariables = {
# logical: config_file, env_var, default_value
'profile': (None, 'BOTO_DEFAULT_PROFILE', None),
'region': ('region', 'BOTO_DEFAULT_REGION', None),
'data_path': ('data_path', 'BOTO_DATA_PATH', None),
'config_file': (None, 'AWS_CONFIG_FILE', '~/.aws/config'),
'provider': ('provider', 'BOTO_PROVIDER_NAME', 'aws'),
# These variables are intended for internal use so don't have any
# user settable values.
# This is the shared credentials file amongst sdks.
'credentials_file': (None, None, '~/.aws/credentials'),
# These variables only exist in the config file.
# This is the number of seconds until we time out a request to
# the instance metadata service.
'metadata_service_timeout': ('metadata_service_timeout', None, 1),
# This is the number of request attempts we make until we give
# up trying to retrieve data from the instance metadata service.
'metadata_service_num_attempts':
('metadata_service_num_attempts', None, 1),
}
"""
A default dictionary that maps the logical names for session variables
to the specific environment variables and configuration file names
that contain the values for these variables.
When creating a new Session object, you can pass in your own dictionary to
remap the logical names or to add new logical names. You can then get the
current value for these variables by using the ``get_config_variable``
method of the :class:`botocore.session.Session` class.
The default set of logical variable names are:
* profile - Default profile name you want to use.
* region - Default region name to use, if not otherwise specified.
* data_path - Additional directories to search for data files.
* config_file - Location of a Boto config file.
* provider - The name of the service provider (e.g. aws)
These form the keys of the dictionary. The values in the dictionary
are tuples of (<config_name>, <environment variable>, <default value).
The ``profile`` and ``config_file`` variables should always have a
None value for the first entry in the tuple because it doesn't make
sense to look inside the config file for the location of the config
file or for the default profile to use.
The ``config_name`` is the name to look for in the configuration file,
the ``env var`` is the OS environment variable (``os.environ``) to
use, and ``default_value`` is the value to use if no value is otherwise
found.
"""
FmtString = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
def __init__(self,
session_vars=None,
event_hooks=None,
include_builtin_handlers=True,
loader=None):
"""
Create a new Session object.
:type session_vars: dict
:param session_vars: A dictionary that is used to override some or all
of the environment variables associated with this session. The
key/value pairs defined in this dictionary will override the
corresponding variables defined in ``SessionVariables``.
:type event_hooks: BaseEventHooks
:param event_hooks: The event hooks object to use. If one is not
provided, an event hooks object will be automatically created
for you.
:type include_builtin_handlers: bool
:param include_builtin_handlers: Indicates whether or not to
automatically register builtin handlers.
"""
self.session_var_map = copy.copy(self.SessionVariables)
if session_vars:
self.session_var_map.update(session_vars)
if event_hooks is None:
self._events = HierarchicalEmitter()
else:
self._events = event_hooks
if include_builtin_handlers:
self._register_builtin_handlers(self._events)
self.user_agent_name = 'Botocore'
self.user_agent_version = __version__
self.user_agent_extra = ''
self._profile = None
self._config = None
self._credentials = None
self._profile_map = None
self._provider = None
# This is a dict that stores per session specific config variable
# overrides via set_config_variable().
self._session_instance_vars = {}
if loader is None:
loader = Loader()
self._loader = loader
# _data_paths_added is used to track whether or not we added
# extra paths to the loader. We will do this lazily
# only when we ask for the loader.
self._data_paths_added = False
self._components = ComponentLocator()
self._register_components()
def _register_components(self):
self._register_credential_provider()
self._register_data_loader()
self._register_endpoint_resolver()
self._register_event_emitter()
self._register_response_parser_factory()
def _register_event_emitter(self):
self._components.register_component('event_emitter', self._events)
def _register_credential_provider(self):
self._components.lazy_register_component(
'credential_provider',
lambda: botocore.credentials.create_credential_resolver(self))
def _register_data_loader(self):
self._components.lazy_register_component(
'data_loader',
lambda: Loader(self.get_config_variable('data_path') or ''))
def _register_endpoint_resolver(self):
self._components.lazy_register_component(
'endpoint_resolver',
lambda: regions.EndpointResolver(self.get_data('aws/_endpoints')))
def _register_response_parser_factory(self):
self._components.register_component('response_parser_factory',
ResponseParserFactory())
def _reset_components(self):
self._register_components()
def _register_builtin_handlers(self, events):
for spec in handlers.BUILTIN_HANDLERS:
if len(spec) == 2:
event_name, handler = spec
self.register(event_name, handler)
else:
event_name, handler, register_type = spec
if register_type is handlers.REGISTER_FIRST:
self._events.register_first(event_name, handler)
elif register_first is handlers.REGISTER_LAST:
self._events.register_last(event_name, handler)
@property
def provider(self):
if self._provider is None:
self._provider = get_provider(self,
self.get_config_variable('provider'))
return self._provider
@property
def available_profiles(self):
return list(self._build_profile_map().keys())
def _build_profile_map(self):
# This will build the profile map if it has not been created,
# otherwise it will return the cached value. The profile map
# is a list of profile names, to the config values for the profile.
if self._profile_map is None:
self._profile_map = self.full_config['profiles']
return self._profile_map
@property
def profile(self):
return self._profile
@profile.setter
def profile(self, profile):
# Since provider can be specified in profile, changing the
# profile should reset the provider.
self._provider = None
self._profile = profile
# Need to potentially reload the config file/creds.
self._reset_components()
def get_config_variable(self,
logical_name,
methods=('instance', 'env', 'config'),
default=None):
"""
Retrieve the value associated with the specified logical_name
from the environment or the config file. Values found in the
environment variable take precedence of values found in the
config file. If no value can be found, a None will be returned.
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to retrieve. This name will be mapped to the
appropriate environment variable name for this session as
well as the appropriate config file entry.
:type method: tuple
:param method: Defines which methods will be used to find
the variable value. By default, all available methods
are tried but you can limit which methods are used
by supplying a different value to this parameter.
Valid choices are: instance|env|config
:param default: The default value to return if there is no
value associated with the config file. This value will
override any default value specified in ``SessionVariables``.
:returns: str value of variable of None if not defined.
"""
value = None
# There's two types of defaults here. One if the
# default value specified in the SessionVariables.
# The second is an explicit default value passed into this
# function (the default parameter).
# config_default is tracking the default value specified
# in the SessionVariables.
config_default = None
if logical_name in self.session_var_map:
# Short circuit case, check if the var has been explicitly
# overriden via set_config_variable.
if 'instance' in methods and \
logical_name in self._session_instance_vars:
return self._session_instance_vars[logical_name]
config_name, envvar_name, config_default = self.session_var_map[
logical_name]
if logical_name in ('config_file', 'profile'):
config_name = None
if logical_name == 'profile' and self._profile:
value = self._profile
elif 'env' in methods and envvar_name and envvar_name in os.environ:
value = os.environ[envvar_name]
elif 'config' in methods:
if config_name:
config = self.get_scoped_config()
value = config.get(config_name)
# If we don't have a value at this point, we need to try to assign
# a default value. An explicit default argument will win over the
# default value from SessionVariables.
if value is None and default is not None:
value = default
if value is None and config_default is not None:
value = config_default
return value
def set_config_variable(self, logical_name, value):
"""Set a configuration variable to a specific value.
By using this method, you can override the normal lookup
process used in ``get_config_variable`` by explicitly setting
a value. Subsequent calls to ``get_config_variable`` will
use the ``value``. This gives you per-session specific
configuration values.
::
>>> # Assume logical name 'foo' maps to env var 'FOO'
>>> os.environ['FOO'] = 'myvalue'
>>> s.get_config_variable('foo')
'myvalue'
>>> s.set_config_variable('foo', 'othervalue')
>>> s.get_config_variable('foo')
'othervalue'
:type logical_name: str
:param logical_name: The logical name of the session variable
you want to set. These are the keys in ``SessionVariables``.
:param value: The value to associate with the config variable.
"""
self._session_instance_vars[logical_name] = value
def get_scoped_config(self):
"""
Returns the config values from the config file scoped to the current
profile.
The configuration data is loaded **only** from the config file.
It does not resolve variables based on different locations
(e.g. first from the session instance, then from environment
variables, then from the config file). If you want this lookup
behavior, use the ``get_config_variable`` method instead.
Note that this configuration is specific to a single profile (the
``profile`` session variable).
If the ``profile`` session variable is set and the profile does
not exist in the config file, a ``ProfileNotFound`` exception
will be raised.
:raises: ConfigNotFound, ConfigParseError, ProfileNotFound
:rtype: dict
"""
profile_name = self.get_config_variable('profile')
profile_map = self._build_profile_map()
# If a profile is not explicitly set return the default
# profile config or an empty config dict if we don't have
# a default profile.
if profile_name is None:
return profile_map.get('default', {})
elif profile_name not in profile_map:
# Otherwise if they specified a profile, it has to
# exist (even if it's the default profile) otherwise
# we complain.
raise ProfileNotFound(profile=profile_name)
else:
return profile_map[profile_name]
@property
def full_config(self):
"""Return the parsed config file.
The ``get_config`` method returns the config associated with the
specified profile. This property returns the contents of the
**entire** config file.
:rtype: dict
"""
if self._config is None:
try:
config_file = self.get_config_variable('config_file')
self._config = botocore.config.load_config(config_file)
except ConfigNotFound:
self._config = {'profiles': {}}
try:
# Now we need to inject the profiles from the
# credentials file. We don't actually need the values
# in the creds file, only the profile names so that we
# can validate the user is not referring to a nonexistent
# profile.
cred_file = self.get_config_variable('credentials_file')
cred_profiles = botocore.config.raw_config_parse(cred_file)
for profile in cred_profiles:
cred_vars = cred_profiles[profile]
if profile not in self._config['profiles']:
self._config['profiles'][profile] = cred_vars
else:
self._config['profiles'][profile].update(cred_vars)
except ConfigNotFound:
pass
return self._config
def set_credentials(self, access_key, secret_key, token=None):
"""
Manually create credentials for this session. If you would
prefer to use botocore without a config file, environment variables,
or IAM roles, you can pass explicit credentials into this
method to establish credentials for this session.
:type access_key: str
:param access_key: The access key part of the credentials.
:type secret_key: str
:param secret_key: The secret key part of the credentials.
:type token: str
:param token: An option session token used by STS session
credentials.
"""
self._credentials = botocore.credentials.Credentials(
access_key, secret_key, token)
def get_credentials(self):
"""
Return the :class:`botocore.credential.Credential` object
associated with this session. If the credentials have not
yet been loaded, this will attempt to load them. If they
have already been loaded, this will return the cached
credentials.
"""
if self._credentials is None:
self._credentials = self._components.get_component(
'credential_provider').load_credentials()
return self._credentials
def user_agent(self):
"""
Return a string suitable for use as a User-Agent header.
The string will be of the form:
<agent_name>/<agent_version> Python/<py_ver> <plat_name>/<plat_ver>
Where:
- agent_name is the value of the `user_agent_name` attribute
of the session object (`Boto` by default).
- agent_version is the value of the `user_agent_version`
attribute of the session object (the botocore version by default).
by default.
- py_ver is the version of the Python interpreter beng used.
- plat_name is the name of the platform (e.g. Darwin)
- plat_ver is the version of the platform
If ``user_agent_extra`` is not empty, then this value will be
appended to the end of the user agent string.
"""
base = '%s/%s Python/%s %s/%s' % (
self.user_agent_name, self.user_agent_version,
platform.python_version(), platform.system(), platform.release())
if self.user_agent_extra:
base += ' %s' % self.user_agent_extra
return base
def get_data(self, data_path):
"""
Retrieve the data associated with `data_path`.
:type data_path: str
:param data_path: The path to the data you wish to retrieve.
"""
return self.get_component('data_loader').load_data(data_path)
def get_service_model(self, service_name, api_version=None):
"""Get the service model object.
:type service_name: string
:param service_name: The service name
:type api_version: string
:param api_version: The API version of the service. If none is
provided, then the latest API version will be used.
:rtype: L{botocore.model.ServiceModel}
:return: The botocore service model for the service.
"""
service_description = self.get_service_data(service_name, api_version)
return ServiceModel(service_description)
def get_waiter_model(self, service_name, api_version=None):
loader = self.get_component('data_loader')
latest = loader.determine_latest(
'%s/%s' % (self.provider.name, service_name), api_version)
waiter_path = latest.replace('.normal', '.waiters')
waiter_config = loader.load_data(waiter_path)
return waiter.WaiterModel(waiter_config)
def get_service_data(self, service_name, api_version=None):
"""
Retrieve the fully merged data associated with a service.
"""
data_path = '%s/%s' % (self.provider.name, service_name)
service_data = self.get_component('data_loader').load_service_model(
data_path, api_version=api_version)
event_name = self.create_event('service-data-loaded', service_name)
self._events.emit(event_name,
service_data=service_data,
service_name=service_name,
session=self)
return service_data
def get_available_services(self):
"""
Return a list of names of available services.
"""
data_path = '%s' % self.provider.name
return self.get_component('data_loader')\
.list_available_services(data_path)
def get_service(self, service_name, api_version=None):
"""
Get information about a service.
:type service_name: str
:param service_name: The name of the service (e.g. 'ec2')
:returns: :class:`botocore.service.Service`
"""
service = botocore.service.get_service(self,
service_name,
self.provider,
api_version=api_version)
event = self.create_event('service-created')
self._events.emit(event, service=service)
return service
def set_debug_logger(self, logger_name='botocore'):
"""
Convenience function to quickly configure full debug output
to go to the console.
"""
self.set_stream_logger(logger_name, logging.DEBUG)
def set_stream_logger(self,
logger_name,
log_level,
stream=None,
format_string=None):
"""
Convenience method to configure a stream logger.
:type logger_name: str
:param logger_name: The name of the logger to configure
:type log_level: str
:param log_level: The log level to set for the logger. This
is any param supported by the ``.setLevel()`` method of
a ``Log`` object.
:type stream: file
:param stream: A file like object to log to. If none is provided
then sys.stderr will be used.
:type format_string: str
:param format_string: The format string to use for the log
formatter. If none is provided this will default to
``self.FmtString``.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
ch = logging.StreamHandler(stream)
ch.setLevel(log_level)
# create formatter
if format_string is None:
format_string = self.FmtString
formatter = logging.Formatter(format_string)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def set_file_logger(self, log_level, path, logger_name='botocore'):
"""
Convenience function to quickly configure any level of logging
to a file.
:type log_level: int
:param log_level: A log level as specified in the `logging` module
:type path: string
:param path: Path to the log file. The file will be created
if it doesn't already exist.
"""
log = logging.getLogger(logger_name)
log.setLevel(logging.DEBUG)
# create console handler and set level to debug
ch = logging.FileHandler(path)
ch.setLevel(log_level)
# create formatter
formatter = logging.Formatter(self.FmtString)
# add formatter to ch
ch.setFormatter(formatter)
# add ch to logger
log.addHandler(ch)
def register(self,
event_name,
handler,
unique_id=None,
unique_id_uses_count=False):
"""Register a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to invoke when the event
is emitted. This object must be callable, and must
accept ``**kwargs``. If either of these preconditions are
not met, a ``ValueError`` will be raised.
:type unique_id: str
:param unique_id: An optional identifier to associate with the
registration. A unique_id can only be used once for
the entire session registration (unless it is unregistered).
This can be used to prevent an event handler from being
registered twice.
:param unique_id_uses_count: boolean
:param unique_id_uses_count: Specifies if the event should maintain
a count when a ``unique_id`` is registered and unregisted. The
event can only be completely unregistered once every register call
using the unique id has been matched by an ``unregister`` call.
If ``unique_id`` is specified, subsequent ``register``
calls must use the same value for ``unique_id_uses_count``
as the ``register`` call that first registered the event.
:raises ValueError: If the call to ``register`` uses ``unique_id``
but the value for ``unique_id_uses_count`` differs from the
``unique_id_uses_count`` value declared by the very first
``register`` call for that ``unique_id``.
"""
self._events.register(event_name,
handler,
unique_id,
unique_id_uses_count=unique_id_uses_count)
def unregister(self,
event_name,
handler=None,
unique_id=None,
unique_id_uses_count=False):
"""Unregister a handler with an event.
:type event_name: str
:param event_name: The name of the event.
:type handler: callable
:param handler: The callback to unregister.
:type unique_id: str
:param unique_id: A unique identifier identifying the callback
to unregister. You can provide either the handler or the
unique_id, you do not have to provide both.
:param unique_id_uses_count: boolean
:param unique_id_uses_count: Specifies if the event should maintain
a count when a ``unique_id`` is registered and unregisted. The
event can only be completely unregistered once every ``register``
call using the ``unique_id`` has been matched by an ``unregister``
call. If the ``unique_id`` is specified, subsequent
``unregister`` calls must use the same value for
``unique_id_uses_count`` as the ``register`` call that first
registered the event.
:raises ValueError: If the call to ``unregister`` uses ``unique_id``
but the value for ``unique_id_uses_count`` differs from the
``unique_id_uses_count`` value declared by the very first
``register`` call for that ``unique_id``.
"""
self._events.unregister(event_name,
handler=handler,
unique_id=unique_id,
unique_id_uses_count=unique_id_uses_count)
def register_event(self, event_name, fmtstr):
"""
Register a new event. The event will be added to ``AllEvents``
and will then be able to be created using ``create_event``.
:type event_name: str
:param event_name: The base name of the event.
:type fmtstr: str
:param fmtstr: The formatting string for the event.
"""
if event_name not in self.AllEvents:
self.AllEvents[event_name] = fmtstr
def create_event(self, event_name, *fmtargs):
"""
Creates a new event string that can then be emitted.
You could just create it manually, since it's just
a string but this helps to define the range of known events.
:type event_name: str
:param event_name: The base name of the new event.
:type fmtargs: tuple
:param fmtargs: A tuple of values that will be used as the
arguments pass to the string formatting operation. The
actual values passed depend on the type of event you
are creating.
"""
if event_name in self.AllEvents:
fmt_string = self.AllEvents[event_name]
if fmt_string:
event = event_name + (fmt_string % fmtargs)
else:
event = event_name
return event
raise EventNotFound(event_name=event_name)
def emit(self, event_name, **kwargs):
return self._events.emit(event_name, **kwargs)
def emit_first_non_none_response(self, event_name, **kwargs):
responses = self._events.emit(event_name, **kwargs)
return first_non_none_response(responses)
def get_component(self, name):
return self._components.get_component(name)
def register_component(self, name, component):
self._components.register_component(name, component)
def lazy_register_component(self, name, component):
self._components.lazy_register_component(name, component)
def create_client(self,
service_name,
region_name=None,
api_version=None,
use_ssl=True,
verify=None,
endpoint_url=None,
aws_access_key_id=None,
aws_secret_access_key=None,
aws_session_token=None):
"""Create a botocore client.
:type service_name: string
:param service_name: The name of the service for which a client will
be created. You can use the ``Sesssion.get_available_services()``
method to get a list of all available service names.
:type region_name: string
:param region_name: The name of the region associated with the client.
A client is associated with a single region.
:type api_version: string
:param api_version: The API version to use. By default, botocore will
use the latest API version when creating a client. You only need
to specify this parameter if you want to use a previous API version
of the client.
:type use_ssl: boolean
:param use_ssl: Whether or not to use SSL. By default, SSL is used. Note that
not all services support non-ssl connections.
:type verify: boolean/string
:param verify: Whether or not to verify SSL certificates. By default SSL certificates
are verified. You can provide the following values:
* False - do not validate SSL certificates. SSL will still be
used (unless use_ssl is False), but SSL certificates
will not be verified.
* path/to/cert/bundle.pem - A filename of the CA cert bundle to
uses. You can specify this argument if you want to use a different
CA cert bundle than the one used by botocore.
:type endpoint_url: string
:param endpoint_url: The complete URL to use for the constructed client.
Normally, botocore will automatically construct the appropriate URL
to use when communicating with a service. You can specify a
complete URL (including the "http/https" scheme) to override this
behavior. If this value is provided, then ``use_ssl`` is ignored.
:type aws_access_key_id: string
:param aws_access_key_id: The access key to use when creating
the client. This is entirely optional, and if not provided,
the credentials configured for the session will automatically
be used. You only need to provide this argument if you want
to override the credentials used for this specific client.
:type aws_secret_access_key: string
:param aws_secret_access_key: The secret key to use when creating
the client. Same semantics as aws_access_key_id above.
:type aws_session_token: string
:param aws_session_token: The session token to use when creating
the client. Same semantics as aws_access_key_id above.
:rtype: botocore.client.BaseClient
:return: A botocore client instance
"""
if region_name is None:
region_name = self.get_config_variable('region')
loader = self.get_component('data_loader')
event_emitter = self.get_component('event_emitter')
response_parser_factory = self.get_component('response_parser_factory')
if aws_secret_access_key is not None:
credentials = botocore.credentials.Credentials(
access_key=aws_access_key_id,
secret_key=aws_secret_access_key,
token=aws_session_token)
else:
credentials = self.get_credentials()
endpoint_resolver = self.get_component('endpoint_resolver')
client_creator = botocore.client.ClientCreator(
loader, endpoint_resolver, self.user_agent(), event_emitter,
response_parser_factory)
client = client_creator.create_client(
service_name,
region_name,
use_ssl,
endpoint_url,
verify,
credentials,
scoped_config=self.get_scoped_config())
return client
class TestWildcardHandlers(unittest.TestCase):
def setUp(self):
self.emitter = HierarchicalEmitter()
self.hook_calls = []
def hook(self, **kwargs):
self.hook_calls.append(kwargs)
def register(self, event_name):
func = partial(self.hook, registered_with=event_name)
self.emitter.register(event_name, func)
return func
def assert_hook_is_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after > starting:
self.fail("Handler was not called for event: %s" % event)
self.assertEqual(self.hook_calls[-1]['event_name'], event)
def assert_hook_is_not_called_given_event(self, event):
starting = len(self.hook_calls)
self.emitter.emit(event)
after = len(self.hook_calls)
if not after == starting:
self.fail("Handler was called for event but was not "
"suppose to be called: %s, last_event: %s" %
(event, self.hook_calls[-1]))
def test_one_level_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
# Also register for a number of other events to check
# for false positives.
self.emitter.register('other.bar.baz', self.hook)
self.emitter.register('qqq.baz', self.hook)
self.emitter.register('dont.call.me', self.hook)
self.emitter.register('dont', self.hook)
# These calls should trigger our hook.
self.assert_hook_is_called_given_event('foo.bar.baz')
self.assert_hook_is_called_given_event('foo.qux.baz')
self.assert_hook_is_called_given_event('foo.anything.baz')
# These calls should not match our hook.
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('bar.qux.baz')
self.assert_hook_is_not_called_given_event('foo-bar')
def test_hierarchical_wildcard_handler(self):
self.emitter.register('foo.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_called_given_event('foo.bar.baz.qux.foo')
self.assert_hook_is_called_given_event('foo.qux.baz.qux')
self.assert_hook_is_called_given_event('foo.qux.baz.qux.foo')
self.assert_hook_is_not_called_given_event('bar.qux.baz.foo')
def test_multiple_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.ANY.THING.baz')
self.assert_hook_is_called_given_event('foo.AT.ALL.baz')
# More specific than what we registered for.
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra')
self.assert_hook_is_called_given_event('foo.bar.baz.baz.extra.stuff')
# Too short:
self.assert_hook_is_not_called_given_event('foo')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
# Bad ending segment.
self.assert_hook_is_not_called_given_event('foo.ANY.THING.notbaz')
self.assert_hook_is_not_called_given_event('foo.ANY.THING.stillnotbaz')
def test_can_unregister_for_wildcard_events(self):
self.emitter.register('foo.*.*.baz', self.hook)
# Call multiple times to verify caching behavior.
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
def test_unregister_does_not_exist(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_cache_cleared_properly(self):
self.emitter.register('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.emitter.register('foo.*.*.bar', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.baz')
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.emitter.unregister('foo.*.*.baz', self.hook)
self.assert_hook_is_called_given_event('foo.bar.baz.bar')
self.assert_hook_is_not_called_given_event('foo.bar.baz.baz')
def test_complicated_register_unregister(self):
r = self.emitter.register
u = partial(self.emitter.unregister, handler=self.hook)
r('foo.bar.baz.qux', self.hook)
r('foo.bar.baz', self.hook)
r('foo.bar', self.hook)
r('foo', self.hook)
u('foo.bar.baz')
u('foo')
u('foo.bar')
self.assert_hook_is_called_given_event('foo.bar.baz.qux')
self.assert_hook_is_not_called_given_event('foo.bar.baz')
self.assert_hook_is_not_called_given_event('foo.bar')
self.assert_hook_is_not_called_given_event('foo')
def test_register_multiple_handlers_for_same_event(self):
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.register('foo.bar.baz', self.hook)
self.emitter.emit('foo.bar.baz')
self.assertEqual(len(self.hook_calls), 2)