class HttpEndpoint(IOpenable, IConfigurable, IReferenceable):
"""
Used for creating HTTP endpoints. An endpoint is a URL, at which a given service can be accessed by a client.
### Configuration parameters ###
Parameters to pass to the [[configure]] method for component configuration:
- connection(s) - the connection resolver's connections;
- "connection.discovery_key" - the key to use for connection resolving in a discovery service;
- "connection.protocol" - the connection's protocol;
- "connection.host" - the target host;
- "connection.port" - the target port;
- "connection.uri" - the target URI.
### References ###
A logger, counters, and a connection resolver can be referenced by passing the following references to the object's [[setReferences]] method:
- *:logger:*:*:1.0 (optional) ILogger components to pass log messages
- *:counters:*:*:1.0 (optional) ICounters components to pass collected measurements
- *:discovery:*:*:1.0 (optional) IDiscovery services to resolve connection
Example:
def my_method(_config, _references):
endpoint = HttpEndpoint()
if (_config)
endpoint.configure(_config)
if (_references)
endpoint.setReferences(_references)
...
endpoint.open(correlationId)
...
"""
_default_config = None
_connection_resolver = None
_logger = None
_counters = None
_registrations = None
_service = None
_server = None
_debug = False
_uri = None
_file_max_size = 200 * 1024 * 1024
_maintenance_enabled = False
_protocol_upgrade_enabled = False
def __init__(self):
"""
Creates HttpEndpoint
"""
self._default_config = ConfigParams.from_tuples(
"connection.protocol", "http", "connection.host", "0.0.0.0",
"connection.port", 3000, "credential.ssl_key_file", None,
"credential.ssl_crt_file", None, "credential.ssl_ca_file", None,
"options.maintenance_enabled", False, "options.request_max_size",
1024 * 1024, "options.file_max_size", 200 * 1024 * 1024,
"connection.connect_timeout", 60000, "connection.debug", True)
self._connection_resolver = HttpConnectionResolver()
self._logger = CompositeLogger()
self._counters = CompositeCounters()
self._registrations = []
def configure(self, config):
"""
Configures this HttpEndpoint using the given configuration parameters.
- connection(s) - the connection resolver's connections;
- "connection.discovery_key" - the key to use for connection resolving in a discovery service;
- "connection.protocol" - the connection's protocol;
- "connection.host" - the target host;
- "connection.port" - the target port;
- "connection.uri" - the target URI.
:param config: configuration parameters, containing a "connection(s)" section.
"""
config = config.set_defaults(self._default_config)
self._connection_resolver.configure(config)
self._file_max_size = config.get_as_boolean_with_default(
'options.file_max_size', self._file_max_size)
self._maintenance_enabled = config.get_as_long_with_default(
'options.maintenance_enabled', self._maintenance_enabled)
self._protocol_upgrade_enabled = config.get_as_boolean_with_default(
'options.protocol_upgrade_enabled', self._protocol_upgrade_enabled)
self._debug = config.get_as_boolean_with_default(
'connection.debug', self._debug)
def set_references(self, references):
"""
Sets references to this endpoint's logger, counters, and connection resolver.
- *:logger:*:*:1.0 (optional) ILogger components to pass log messages
- *:counters:*:*:1.0 (optional) ICounters components to pass collected measurements
- *:discovery:*:*:1.0 (optional) IDiscovery services to resolve connection
:param references: an IReferences object, containing references to a logger, counters, and a connection resolver.
"""
self._logger.set_references(references)
self._counters.set_references(references)
self._connection_resolver.set_references(references)
def is_opened(self):
"""
Checks if the component is opened.
:return: whether or not this endpoint is open with an actively listening REST server.
"""
return not (self._server is None)
def open(self, correlation_id):
"""
Opens a connection using the parameters resolved by the referenced connection resolver and creates a REST server (service) using the set options and parameters.
:param correlation_id: (optional) transaction id to trace execution through call chain.
"""
if self.is_opened():
return
connection = self._connection_resolver.resolve(correlation_id)
if connection is None:
raise ConfigException(correlation_id, "NO_CONNECTION",
"Connection for REST client is not defined")
self._uri = connection.get_uri()
# verify https with bottle
certfile = None
keyfile = None
if connection.get_protocol('http') == 'https':
certfile = connection.get_as_nullable_string('ssl_crt_file')
keyfile = connection.get_as_nullable_string('ssl_key_file')
# Create instance of bottle application
self._service = SessionMiddleware(
bottle.Bottle(catchall=True, autojson=True)).app
self._service.config['catchall'] = True
self._service.config['autojson'] = True
# Enable CORS requests
self._service.add_hook('after_request', self._enable_cors)
self._service.route('/', 'OPTIONS', self._options_handler)
self._service.route('/<path:path>', 'OPTIONS', self._options_handler)
self._service.add_hook('after_request', self._do_maintance)
self._service.add_hook('after_request', self._no_cache)
self._service.add_hook('before_request', self._add_compatibility)
# Register routes
# self.perform_registrations()
def start_server():
self._service.run(server=self._server, debug=self._debug)
# self.perform_registrations()
host = connection.get_host()
port = connection.get_port()
# Starting service
try:
self._server = SSLCherryPyServer(host=host,
port=port,
certfile=certfile,
keyfile=keyfile)
# Start server in thread
Thread(target=start_server).start()
# Give 2 sec for initialization
self._connection_resolver.register(correlation_id)
self._logger.debug(
correlation_id,
f"Opened REST service at {self._uri}",
)
self.perform_registrations()
except Exception as ex:
self._server = None
raise ConnectionException(correlation_id, 'CANNOT_CONNECT', 'Opening REST service failed') \
.wrap(ex).with_details('url', self._uri)
def close(self, correlation_id):
"""
Closes this endpoint and the REST server (service) that was opened earlier.
:param correlation_id: (optional) transaction id to trace execution through call chain.
"""
try:
if not (self._server is None):
self._server.shutdown()
self._service.close()
self._logger.debug(correlation_id, "Closed REST service at %s",
self._uri)
self._server = None
self._service = None
self._uri = None
except Exception as ex:
self._logger.warn(correlation_id,
"Failed while closing REST service: " + str(ex))
def register(self, registration):
"""
Registers a registerable object for dynamic endpoint discovery.
:param registration: the registration to add.
"""
self._registrations.append(registration)
def unregister(self, registration):
"""
Unregisters a registerable object, so that it is no longer used in dynamic endpoint discovery.
:param registration: the registration to remove.
"""
self._registrations.remove(registration)
def perform_registrations(self):
for registration in self._registrations:
registration.register()
def fix_route(self, route) -> str:
if route is not None and len(route) > 0:
if route[0] != '/':
route = f'/{route}'
return route
return ''
def register_route(self, method, route, schema, handler):
"""
Registers an action in this objects REST server (service) by the given method and route.
:param method: the HTTP method of the route.
:param route: the route to register in this object's REST server (service).
:param schema: the schema to use for parameter validation.
:param handler: the action to perform at the given route.
"""
method = method.upper()
# if method == 'DELETE':
# method = 'DEL'
route = self.fix_route(route)
def wrapper(*args, **kwargs):
try:
if isinstance(schema, Schema):
params = self.get_data()
correlation_id = params[
'correlation_id'] if 'correlation_id' in params else None
error = schema.validate_and_throw_exception(
correlation_id, params, False)
return handler(*args, **kwargs)
except Exception as ex:
return HttpResponseSender.send_error(ex)
self._service.route(route, method, wrapper)
def get_data(self):
if request.json:
return request.json
else:
return None
def _enable_cors(self):
response.headers['Access-Control-Max-Age'] = '5'
response.headers['Access-Control-Allow-Origin'] = '*'
response.headers[
'Access-Control-Allow-Methods'] = 'PUT, GET, POST, DELETE, OPTIONS'
response.headers[
'Access-Control-Allow-Headers'] = 'Authorization, Origin, Accept, Content-Type, X-Requested-With'
def _do_maintance(self):
"""
:return: maintenance error code
"""
# Make this more sophisticated
if self._maintenance_enabled:
response.headers['Retry-After'] = 3600
response.status = 503
def _no_cache(self):
"""
Prevents IE from caching REST requests
"""
response.headers[
'Cache-Control'] = 'no-cache, no-store, must-revalidate'
response.headers['Pragma'] = 'no-cache'
response.headers['Expires'] = 0
def _add_compatibility(self):
def inner(name):
if request.query:
param = request.query[name]
if param:
return param
if request.body:
param = request.json[name]
if param:
return param
if request.params:
param = request.params[name]
if param:
return param
return None
request['param'] = inner
request['route'] = {'params': request.params}
def _options_handler(self, ath=None):
return
def get_param(self, param, default=None):
return request.params.get(param, default)
def get_correlation_id(self):
return request.query.get('correlation_id')
def register_route_with_auth(self, method, route, schema, authorize,
action):
"""
Registers an action with authorization in this objects REST server (service)
by the given method and route.
:param method: the HTTP method of the route.
:param route: the route to register in this object's REST server (service).
:param schema: the schema to use for parameter validation.
:param authorize: the authorization interceptor
:param action: the action to perform at the given route.
"""
if authorize:
next_action = action
action = lambda req, res: authorize(
request, response, next_action(response, response))
self.register_route(method, route, schema, action)
def register_interceptor(self, route, action):
"""
Registers a middleware action for the given route.
:param route: the route to register in this object's REST server (service).
:param action: the middleware action to perform at the given route.
"""
route = self.fix_route(route)
self._service.add_hook(
'before_request', lambda: action(request, response)
if not (route is not None and route != '' and request.url.
startswith(route)) else None)
class PrometheusCounters(CachedCounters, IReferenceable, IOpenable):
"""
Performance counters that send their metrics to Prometheus service.
The component is normally used in passive mode conjunction with :class:`PrometheusMetricsService <pip_services3_prometheus.services.PrometheusMetricsService.PrometheusMetricsService>`.
Alternatively when connection parameters are set it can push metrics to Prometheus PushGateway.
### Configuration parameters ###
- connection(s):
- discovery_key: (optional) a key to retrieve the connection from :class:`IDiscovery <pip_services3_components.connect.IDiscovery.IDiscovery>`
- protocol: connection protocol: http or https
- host: host name or IP address
- port: port number
- uri: resource URI or connection string with all parameters in it
- options:
- retries: number of retries (default: 3)
- connect_timeout: connection timeout in milliseconds (default: 10 sec)
- timeout: invocation timeout in milliseconds (default: 10 sec)
### References ###
- `*:logger:*:*:1.0` (optional) :class:`ILogger <pip_services3_components.log.ILogger.ILogger>` components to pass log messages
- `*:counters:*:*:1.0` (optional) :class:`ICounters <pip_services3_components.count.ICounters.ICounters>` components to pass collected measurements
- `*:discovery:*:*:1.0` (optional) :class:`IDiscovery <pip_services3_components.connect.IDiscovery.IDiscovery>` services to resolve connection
See :class:`RestService <pip_services3_rpc.services.RestService.RestService>`, :class:`CommandableHttpService <pip_services3_rpc.services.CommandableHttpService.CommandableHttpService>`,
Example:
.. code-block:: python
counters = PrometheusCounters()
counters.configure(ConfigParams.from_tuples(
"connection.protocol", "http",
"connection.host", "localhost",
"connection.port", 8080
))
counters.open("123")
counters.increment("mycomponent.mymethod.calls")
timing = counters.begin_timing("mycomponent.mymethod.exec_time")
try:
...
finally:
timing.end_timing()
counters.dump()
"""
def __init__(self):
"""
Creates a new instance of the performance counters.
"""
super(PrometheusCounters, self).__init__()
self.__logger = CompositeLogger()
self.__connection_resolver = HttpConnectionResolver()
self.__opened = False
self.__source: str = None
self.__instance: str = None
self.__push_enabled: bool = None
self.__client: Any = None
self.__request_route: str = None
def configure(self, config: ConfigParams):
"""
Configures component by passing configuration parameters.
:param config: configuration parameters to be set.
"""
super().configure(config)
self.__connection_resolver.configure(config)
self.__source = config.get_as_float_with_default(
'source', self.__source)
self.__instance = config.get_as_float_with_default(
'instance', self.__instance)
self.__push_enabled = config.get_as_float_with_default(
'push_enabled', True)
def set_references(self, references: IReferences):
"""
Sets references to dependent components.
:param references: references to locate the component dependencies.
"""
self.__logger.set_references(references)
self.__connection_resolver.set_references(references)
context_info = references.get_one_optional(
Descriptor("pip-services", "context-info", "default", "*", "1.0"))
if context_info is not None and self.__source is None:
self.__source = context_info.name
if context_info is not None and self.__instance is None:
self.__instance = context_info.context_id
def is_open(self) -> bool:
"""
Checks if the component is opened.
:return: true if the component has been opened and false otherwise.
"""
return self.__opened
def open(self, correlation_id: Optional[str]):
"""
Opens the component.
:param correlation_id: (optional) transaction id to trace execution through call chain.
"""
if self.__opened or not self.__push_enabled:
return
self.__opened = True
try:
connection = self.__connection_resolver.resolve(correlation_id)
job = self.__source or 'unknown'
instance = self.__instance or socket.gethostname()
self.__request_route = "/metrics/job/" + job + "/instance/" + instance
uri = connection.get_as_string('uri').split('://')[-1]
if connection.get_as_string('protocol') == 'https':
self.__client = HTTPSConnectionPool(uri)
else:
self.__client = HTTPConnectionPool(uri)
except Exception as err:
self.__client = None
self.__logger.warn(
correlation_id,
"Connection to Prometheus server is not configured: " +
str(err))
def close(self, correlation_id: Optional[str]):
"""
Closes component and frees used resources.
:param correlation_id: (optional) transaction id to trace execution through call chain.
"""
self.__opened = False
self.__request_route = None
try:
if self.__client:
self.__client.close()
finally:
self.__client = None
def _save(self, counters: List[Counter]):
"""
Saves the current counters measurements.
:param counters: current counters measurements to be saves.
"""
if self.__client is None or not self.__push_enabled: return
body = PrometheusCounterConverter.to_string(counters, None, None)
err = None
response = None
try:
response = self.__client.request('PUT',
self.__request_route,
body=body)
except Exception as ex:
err = ex
finally:
if err or response.status >= 400:
self.__logger.error("prometheus-counters", err,
"Failed to push metrics to prometheus")
