def test_generic_callback_ok(self):
from kazoo.client import _generic_callback
from kazoo.handlers.threading import SequentialThreadingHandler
handler = SequentialThreadingHandler()
# No args
asy = handler.async_result()
_generic_callback(asy, 0, zookeeper.OK)
eq_(asy.get(), None)
# One arg thats not a dict
asy = handler.async_result()
_generic_callback(asy, 0, zookeeper.OK, 12)
eq_(asy.get(), 12)
# One arg thats a node struct
asy = handler.async_result()
_generic_callback(asy, 0, zookeeper.OK, dummy_dict)
eq_(asy.get().acl_version, 1)
# two args, second is struct
asy = handler.async_result()
_generic_callback(asy, 0, zookeeper.OK, 11, dummy_dict)
val = asy.get()
eq_(val[1].acl_version, 1)
eq_(val[0], 11)
def test_generic_callback_error(self):
from kazoo.client import _generic_callback
from kazoo.handlers.threading import SequentialThreadingHandler
handler = SequentialThreadingHandler()
asy = handler.async_result()
_generic_callback(asy, 0, zookeeper.CONNECTIONLOSS)
self.assertRaises(zookeeper.ConnectionLossException, asy.get)
def test_exists_callback(self):
from kazoo.client import _exists_callback
from kazoo.handlers.threading import SequentialThreadingHandler
handler = SequentialThreadingHandler()
asy = handler.async_result()
_exists_callback(asy, 0, zookeeper.OK, True)
eq_(asy.get(), True)
asy = handler.async_result()
_exists_callback(asy, 0, zookeeper.CONNECTIONLOSS, False)
self.assertRaises(zookeeper.ConnectionLossException, asy.get)
def setUp(self):
self._driver = FakeDriver()
self._storage = FakeStorage(SequentialThreadingHandler())
self._zk_client = FakeClient(storage=self._storage)
self._zk_client.start()
self._framework_id = mesos_pb2.FrameworkID()
self._framework_id.value = "framework_id_0"
self._offer = mesos_pb2.Offer()
self._offer.id.value = "offer_id_0"
self._offer.framework_id.value = self._framework_id.value
self._offer.slave_id.value = "slave_id_0"
self._offer.hostname = "localhost"
resources = create_resources(cpus=4,
mem=512 * 3,
ports=set([10000, 10001, 10002]))
self._offer.resources.extend(resources)
self._framework_user = "******"
self._zk_url = "zk://host/mysos/test"
self._cluster = MySQLCluster("cluster0", "user", "pass", 3)
self._tmpdir = tempfile.mkdtemp()
self._state_provider = LocalStateProvider(self._tmpdir)
framework_info = mesos_pb2.FrameworkInfo(user=getpass.getuser(),
name="mysos",
checkpoint=False)
self._state = Scheduler(framework_info)
def setup(self, request):
self._driver = FakeDriver()
self._storage = FakeStorage(SequentialThreadingHandler())
self._zk_client = FakeClient(storage=self._storage)
self._zk_client.start()
self._offer = mesos_pb2.Offer()
self._offer.id.value = "offer_id_0"
self._offer.framework_id.value = "framework_id_0"
self._offer.slave_id.value = "slave_id_0"
self._offer.hostname = "localhost"
# Enough memory and ports to fit three tasks.
resources = create_resources(cpus=4,
mem=512 * 3,
ports=set([10000, 10001, 10002]))
self._offer.resources.extend(resources)
self._framework_user = "******"
# Some tests use the default launcher; some don't.
self._zk_url = "zk://host/mysos/test"
self._cluster = MySQLCluster("cluster0", "user", "pass", 3)
# Construct the state provider based on the test parameter.
if request.param == LocalStateProvider:
tmpdir = tempfile.mkdtemp()
self._state_provider = LocalStateProvider(tmpdir)
request.addfinalizer(lambda: shutil.rmtree(tmpdir, True)
) # Clean up after ourselves.
elif request.param == ZooKeeperStateProvider:
self._state_provider = ZooKeeperStateProvider(
self._zk_client, "/mysos/test")
self._launcher = MySQLClusterLauncher(
self._driver,
self._cluster,
self._state_provider,
self._zk_url,
self._zk_client,
self._framework_user,
"./executor.pex",
"cmd.sh",
Amount(5, Time.SECONDS),
"/etc/mysos/admin_keyfile.yml",
query_interval=Amount(150, Time.MILLISECONDS)) # Short interval.
self._elected = threading.Event()
self._launchers = [self._launcher] # See teardown().
request.addfinalizer(self.teardown)
def test_scheduler_runs():
"""
Verifies that the scheduler successfully launches 3 "no-op" MySQL tasks.
NOTE: Due to the limitation of zake the scheduler's ZK operations are not propagated to
executors in separate processes but they are unit-tested separately.
"""
import mesos.native
# Make sure fake_mysos_executor.pex is available to be fetched by Mesos slave.
assert os.path.isfile('dist/fake_mysos_executor.pex')
storage = FakeStorage(SequentialThreadingHandler())
zk_client = FakeClient(storage=storage)
zk_client.start()
zk_url = "zk://fake_host/home/mysos/clusters"
cluster_name = "test_cluster"
num_nodes = 3
state_provider = LocalStateProvider(safe_mkdtemp())
framework_info = FrameworkInfo(user=getpass.getuser(),
name="mysos",
checkpoint=False)
state = Scheduler(framework_info)
scheduler = MysosScheduler(state, state_provider, getpass.getuser(),
os.path.abspath("dist/fake_mysos_executor.pex"),
"./fake_mysos_executor.pex", zk_client, zk_url,
Amount(40, Time.SECONDS), "/fakepath",
gen_encryption_key())
scheduler_driver = mesos.native.MesosSchedulerDriver(
scheduler, framework_info, "local")
scheduler_driver.start()
# Wait until the scheduler is connected and becomes available.
assert scheduler.connected.wait(30)
scheduler.create_cluster(cluster_name, "mysql_user", num_nodes)
# A slave is promoted to be the master.
deadline(
lambda: wait_for_master(
get_cluster_path(posixpath.join(zk_url, 'discover'), cluster_name),
zk_client), Amount(40, Time.SECONDS))
assert scheduler_driver.stop() == DRIVER_STOPPED
def zk_conn():
conn_retry_policy = KazooRetry(max_tries=-1,
delay=0.1,
backoff=2,
max_delay=3600)
handler = SequentialThreadingHandler()
conn = KazooClient(hosts="127.0.0.1:2181",
timeout=60,
handler=handler,
connection_retry=conn_retry_policy,
command_retry=conn_retry_policy)
conn.start()
yield conn
conn.stop()
def __init__(self, port):
"""
Read config and spawn child processes.
:type port: int
"""
self._log = logging.getLogger('sent.daemon')
self._log.info('Creating Sentinel')
self._port = port
self.children = dict()
self._settings = None
self._system = get_system()
self._hostname = socket.getfqdn()
self._prev_state = None
self.listener_lock = Lock()
self.version = get_version()
self.task_client = None
self.zkclient = KazooClient(hosts=get_zk_conn_string(),
timeout=60.0,
handler=SequentialThreadingHandler(),
logger=logging.getLogger('kazoo.daemon'))
self.zkclient.add_listener(self._zk_listener)
# this will run self._reset_after_connection_loss
self.zkclient.start()
while not self._settings:
self._log.info('Waiting for settings.')
time.sleep(1)
self._tmp_dir = os.path.join(
self._settings.get('zookeeper').get('temp_directory', '/'), 'ruok')
self.task_client = ZKTaskClient(
self.children, self.zkclient,
self._settings.get('zookeeper', {}).get('task'))
self._rest_server = tornado.httpserver.HTTPServer(
RestServer(self.children, self.version, self._tmp_dir,
self._hostname, self.zkclient))
signal.signal(signal.SIGINT, self._handle_sigint)
signal.signal(signal.SIGTERM, self._handle_sigint)
self._log.info('Created Sentinel')
def _makeOne(self, *args):
from kazoo.handlers.threading import SequentialThreadingHandler
return SequentialThreadingHandler(*args)
def _makeHandler(self):
from kazoo.handlers.threading import SequentialThreadingHandler
return SequentialThreadingHandler()
def __init__(self,
hosts='127.0.0.1:2181',
timeout=10.0,
client_id=None,
handler=None,
default_acl=None,
auth_data=None,
read_only=None,
randomize_hosts=True,
connection_retry=None,
command_retry=None,
logger=None,
**kwargs):
"""Create a :class:`KazooClient` instance. All time arguments
are in seconds.
:param hosts: Comma-separated list of hosts to connect to
(e.g. 127.0.0.1:2181,127.0.0.1:2182,[::1]:2183).
:param timeout: The longest to wait for a Zookeeper connection.
:param client_id: A Zookeeper client id, used when
re-establishing a prior session connection.
:param handler: An instance of a class implementing the
:class:`~kazoo.interfaces.IHandler` interface
for callback handling.
:param default_acl: A default ACL used on node creation.
:param auth_data:
A list of authentication credentials to use for the
connection. Should be a list of (scheme, credential)
tuples as :meth:`add_auth` takes.
:param read_only: Allow connections to read only servers.
:param randomize_hosts: By default randomize host selection.
:param connection_retry:
A :class:`kazoo.retry.KazooRetry` object to use for
retrying the connection to Zookeeper. Also can be a dict of
options which will be used for creating one.
:param command_retry:
A :class:`kazoo.retry.KazooRetry` object to use for
the :meth:`KazooClient.retry` method. Also can be a dict of
options which will be used for creating one.
:param logger: A custom logger to use instead of the module
global `log` instance.
Basic Example:
.. code-block:: python
zk = KazooClient()
zk.start()
children = zk.get_children('/')
zk.stop()
As a convenience all recipe classes are available as attributes
and get automatically bound to the client. For example::
zk = KazooClient()
zk.start()
lock = zk.Lock('/lock_path')
.. versionadded:: 0.6
The read_only option. Requires Zookeeper 3.4+
.. versionadded:: 0.6
The retry_max_delay option.
.. versionadded:: 0.6
The randomize_hosts option.
.. versionchanged:: 0.8
Removed the unused watcher argument (was second argument).
.. versionadded:: 1.2
The connection_retry, command_retry and logger options.
"""
self.logger = logger or log
# Record the handler strategy used
self.handler = handler if handler else SequentialThreadingHandler()
if inspect.isclass(self.handler):
raise ConfigurationError("Handler must be an instance of a class, "
"not the class: %s" % self.handler)
self.auth_data = auth_data if auth_data else set([])
self.default_acl = default_acl
self.randomize_hosts = randomize_hosts
self.hosts = None
self.chroot = None
self.set_hosts(hosts)
# Curator like simplified state tracking, and listeners for
# state transitions
self._state = KeeperState.CLOSED
self.state = KazooState.LOST
self.state_listeners = set()
self._reset()
self.read_only = read_only
if client_id:
self._session_id = client_id[0]
self._session_passwd = client_id[1]
else:
self._reset_session()
# ZK uses milliseconds
self._session_timeout = int(timeout * 1000)
# We use events like twitter's client to track current and
# desired state (connected, and whether to shutdown)
self._live = self.handler.event_object()
self._writer_stopped = self.handler.event_object()
self._stopped = self.handler.event_object()
self._stopped.set()
self._writer_stopped.set()
self.retry = self._conn_retry = None
if type(connection_retry) is dict:
self._conn_retry = KazooRetry(**connection_retry)
elif type(connection_retry) is KazooRetry:
self._conn_retry = connection_retry
if type(command_retry) is dict:
self.retry = KazooRetry(**command_retry)
elif type(command_retry) is KazooRetry:
self.retry = command_retry
if type(self._conn_retry) is KazooRetry:
if self.handler.sleep_func != self._conn_retry.sleep_func:
raise ConfigurationError("Retry handler and event handler "
" must use the same sleep func")
if type(self.retry) is KazooRetry:
if self.handler.sleep_func != self.retry.sleep_func:
raise ConfigurationError(
"Command retry handler and event "
"handler must use the same sleep func")
if self.retry is None or self._conn_retry is None:
old_retry_keys = dict(_RETRY_COMPAT_DEFAULTS)
for key in old_retry_keys:
try:
old_retry_keys[key] = kwargs.pop(key)
warnings.warn(
'Passing retry configuration param %s to the'
' client directly is deprecated, please pass a'
' configured retry object (using param %s)' %
(key, _RETRY_COMPAT_MAPPING[key]),
DeprecationWarning,
stacklevel=2)
except KeyError:
pass
retry_keys = {}
for oldname, value in old_retry_keys.items():
retry_keys[_RETRY_COMPAT_MAPPING[oldname]] = value
if self._conn_retry is None:
self._conn_retry = KazooRetry(
sleep_func=self.handler.sleep_func, **retry_keys)
if self.retry is None:
self.retry = KazooRetry(sleep_func=self.handler.sleep_func,
**retry_keys)
self._conn_retry.interrupt = lambda: self._stopped.is_set()
self._connection = ConnectionHandler(self,
self._conn_retry.copy(),
logger=self.logger)
# Every retry call should have its own copy of the retry helper
# to avoid shared retry counts
self._retry = self.retry
def _retry(*args, **kwargs):
return self._retry.copy()(*args, **kwargs)
self.retry = _retry
self.Barrier = partial(Barrier, self)
self.Counter = partial(Counter, self)
self.DoubleBarrier = partial(DoubleBarrier, self)
self.ChildrenWatch = partial(ChildrenWatch, self)
self.DataWatch = partial(DataWatch, self)
self.Election = partial(Election, self)
self.Lock = partial(Lock, self)
self.Party = partial(Party, self)
self.Queue = partial(Queue, self)
self.LockingQueue = partial(LockingQueue, self)
self.SetPartitioner = partial(SetPartitioner, self)
self.Semaphore = partial(Semaphore, self)
self.ShallowParty = partial(ShallowParty, self)
# If we got any unhandled keywords, complain like python would
if kwargs:
raise TypeError('__init__() got unexpected keyword arguments: %s' %
(kwargs.keys(), ))
def setUp(self): self._storage = FakeStorage(SequentialThreadingHandler()) self._client = FakeClient(storage=self._storage) self._client.start() self._state_provider = ZooKeeperStateProvider(self._client, '/mysos')
# cluster for the client to utilize it.
zk = KazooClient(hosts='127.0.0.1:2181')
zk.start()
print("Client started!\n")
# Clear the nodes at the end or else you migth get a NodeExistsError next time
zk.delete("/app", recursive=True)
# Ensure a path, create if it doesn't exist
zk.ensure_path("/app")
# Initialize queue at specified location
zk_queue = LockingQueue(zk, "/app/queue")
# Thread handler
handler = SequentialThreadingHandler()
# Watchers ---------------------------------------------------------------
@zk.DataWatch("/app/queue")
def watch_queue(data, stat):
if data == "":
pass
elif data is not None or stat is not None:
global input_done
# print("Queue Node:")
# print("%s\n" % data)
# Distrubute incoming data to nodes
if input_done: # If the user is done with entering inputs
zk.set("/app/addition", data)
def __init__(self, config, settings, queue, system, application_type,
cancel_flag):
"""
:type config: dict (xml)
:type settings: dict
:type queue: zoom.agent.entities.unique_queue.UniqueQueue
:type system: zoom.common.types.PlatformType
:type application_type: zoom.common.types.ApplicationType
:type cancel_flag: zoom.agent.entities.thread_safe_object.ThreadSafeObject
"""
self.config = config
self._settings = settings
self.name = verify_attribute(self.config, 'id', none_allowed=False)
self._log = logging.getLogger('sent.{0}.app'.format(self.name))
# informational attributes
self._host = socket.getfqdn()
self._system = system
self._predicates = list()
self._running = True # used to manually stop the run loop
self._prev_state = None
self._actions = dict() # created in _reset_watches on zk connect
self._env = os.environ.get('EnvironmentToUse', 'Staging')
self._apptype = application_type
self._restart_on_crash = \
verify_attribute(self.config, 'restart_on_crash', none_allowed=True)
self._post_stop_sleep = verify_attribute(self.config,
'post_stop_sleep',
none_allowed=True,
cast=int,
default=5)
# tool-like attributes
self.listener_lock = Lock()
self._action_queue = queue
self._mode = ApplicationMode(
ApplicationMode.MANUAL,
callback=self._update_agent_node_with_app_details)
self._state = ThreadSafeObject(
ApplicationState.OK,
callback=self._update_agent_node_with_app_details)
self._start_stop_time = '' # Default to empty string for comparison
self._login_user = '******' # Default to Zoom
self._user_set_in_react = False
self._run_check_mode = False
self._pd_svc_key = verify_attribute(config,
'pagerduty_service',
none_allowed=True)
restartmax = verify_attribute(config,
'restartmax',
none_allowed=True,
cast=int,
default=3)
self._rl = RestartLogic(
self.name,
restartmax,
count_callback=self._update_agent_node_with_app_details)
self._read_only = False
self._paths = self._init_paths(self.config, settings, application_type)
# clients
self.zkclient = KazooClient(hosts=get_zk_conn_string(),
timeout=60.0,
handler=SequentialThreadingHandler(),
logger=logging.getLogger(
'kazoo.app.{0}'.format(self.name)))
self.zkclient.add_listener(self._zk_listener)
self._proc_client = self._init_proc_client(self.config,
application_type,
cancel_flag)
self._actions = self._init_actions(settings)
self._work_manager = self._init_work_manager(self._action_queue)
def __init__(self, hosts='127.0.0.1:2181',
timeout=10.0, client_id=None, max_retries=None,
retry_delay=0.1, retry_backoff=2, retry_jitter=0.8,
retry_max_delay=3600, handler=None, default_acl=None,
auth_data=None, read_only=None, randomize_hosts=True):
"""Create a :class:`KazooClient` instance. All time arguments
are in seconds.
:param hosts: Comma-separated list of hosts to connect to
(e.g. 127.0.0.1:2181,127.0.0.1:2182).
:param timeout: The longest to wait for a Zookeeper connection.
:param client_id: A Zookeeper client id, used when
re-establishing a prior session connection.
:param max_retries: Maximum retries when using the
:meth:`KazooClient.retry` method.
:param retry_delay: Initial delay when retrying a call.
:param retry_backoff:
Backoff multiplier between retry attempts. Defaults to 2
for exponential back-off.
:param retry_jitter:
How much jitter delay to introduce per call. An amount of
time up to this will be added per retry call to avoid
hammering the server.
:param retry_max_delay:
Maximum delay in seconds, regardless of other backoff
settings. Defaults to one hour.
:param handler: An instance of a class implementing the
:class:`~kazoo.interfaces.IHandler` interface
for callback handling.
:param default_acl: A default ACL used on node creation.
:param auth_data:
A list of authentication credentials to use for the
connection. Should be a list of (scheme, credential)
tuples as :meth:`add_auth` takes.
:param read_only: Allow connections to read only servers.
:param randomize_hosts: By default randomize host selection.
Retry parameters will be used for connection establishment
attempts and reconnects.
Basic Example:
.. code-block:: python
zk = KazooClient()
zk.start()
children = zk.get_children('/')
zk.stop()
As a convenience all recipe classes are available as attributes
and get automatically bound to the client. For example::
zk = KazooClient()
zk.start()
lock = zk.Lock('/lock_path')
.. versionadded:: 0.6
The read_only option. Requires Zookeeper 3.4+
.. versionadded:: 0.6
The retry_max_delay option.
.. versionadded:: 0.6
The randomize_hosts option.
.. versionchanged:: 0.8
Removed the unused watcher argument (was second argument).
"""
self.log_debug = logging.DEBUG >= log.getEffectiveLevel()
# Record the handler strategy used
self.handler = handler if handler else SequentialThreadingHandler()
if inspect.isclass(self.handler):
raise ConfigurationError("Handler must be an instance of a class, "
"not the class: %s" % self.handler)
self.auth_data = auth_data if auth_data else set([])
self.default_acl = default_acl
self.randomize_hosts = randomize_hosts
self.hosts, chroot = collect_hosts(hosts, randomize_hosts)
if chroot:
self.chroot = normpath(chroot)
else:
self.chroot = ''
# Curator like simplified state tracking, and listeners for
# state transitions
self._state = KeeperState.CLOSED
self.state = KazooState.LOST
self.state_listeners = set()
self._reset()
self.read_only = read_only
if client_id:
self._session_id = client_id[0]
self._session_passwd = client_id[1]
else:
self._reset_session()
# ZK uses milliseconds
self._session_timeout = int(timeout * 1000)
# We use events like twitter's client to track current and
# desired state (connected, and whether to shutdown)
self._live = self.handler.event_object()
self._writer_stopped = self.handler.event_object()
self._stopped = self.handler.event_object()
self._stopped.set()
self._writer_stopped.set()
self.retry = KazooRetry(
max_tries=max_retries,
delay=retry_delay,
backoff=retry_backoff,
max_jitter=retry_jitter,
max_delay=retry_max_delay,
sleep_func=self.handler.sleep_func
)
self.retry_sleeper = self.retry.retry_sleeper.copy()
self._connection = ConnectionHandler(
self, self.retry.retry_sleeper.copy(), log_debug=self.log_debug)
# convenience API
from kazoo.recipe.barrier import Barrier
from kazoo.recipe.barrier import DoubleBarrier
from kazoo.recipe.counter import Counter
from kazoo.recipe.election import Election
from kazoo.recipe.lock import Lock
from kazoo.recipe.lock import Semaphore
from kazoo.recipe.partitioner import SetPartitioner
from kazoo.recipe.party import Party
from kazoo.recipe.party import ShallowParty
from kazoo.recipe.queue import Queue
from kazoo.recipe.queue import LockingQueue
from kazoo.recipe.watchers import ChildrenWatch
from kazoo.recipe.watchers import DataWatch
self.Barrier = partial(Barrier, self)
self.Counter = partial(Counter, self)
self.DoubleBarrier = partial(DoubleBarrier, self)
self.ChildrenWatch = partial(ChildrenWatch, self)
self.DataWatch = partial(DataWatch, self)
self.Election = partial(Election, self)
self.Lock = partial(Lock, self)
self.Party = partial(Party, self)
self.Queue = partial(Queue, self)
self.LockingQueue = partial(LockingQueue, self)
self.SetPartitioner = partial(SetPartitioner, self)
self.Semaphore = partial(Semaphore, self)
self.ShallowParty = partial(ShallowParty, self)
def setUp(self):
self._storage = FakeStorage(SequentialThreadingHandler())
self._client = FakeClient(storage=self._storage)
self._client.start()
self._self_instance = ServiceInstance(Endpoint("host", 10000))
self._state_manager = FakeStateManager()
def setUp(self):
self.storage = FakeStorage(SequentialThreadingHandler())
self.client = FakeClient(storage=self.storage)
self.client.start()
