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123 lines
5.2 KiB
123 lines
5.2 KiB
import pickle
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import uuid
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try:
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import kombu
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except ImportError:
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kombu = None
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from .pubsub_manager import PubSubManager
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class KombuManager(PubSubManager): # pragma: no cover
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"""Client manager that uses kombu for inter-process messaging.
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This class implements a client manager backend for event sharing across
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multiple processes, using RabbitMQ, Redis or any other messaging mechanism
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supported by `kombu <http://kombu.readthedocs.org/en/latest/>`_.
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To use a kombu backend, initialize the :class:`Server` instance as
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follows::
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url = 'amqp://user:password@hostname:port//'
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server = socketio.Server(client_manager=socketio.KombuManager(url))
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:param url: The connection URL for the backend messaging queue. Example
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connection URLs are ``'amqp://guest:guest@localhost:5672//'``
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and ``'redis://localhost:6379/'`` for RabbitMQ and Redis
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respectively. Consult the `kombu documentation
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<http://kombu.readthedocs.org/en/latest/userguide\
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/connections.html#urls>`_ for more on how to construct
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connection URLs.
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:param channel: The channel name on which the server sends and receives
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notifications. Must be the same in all the servers.
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:param write_only: If set to ``True``, only initialize to emit events. The
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default of ``False`` initializes the class for emitting
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and receiving.
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:param connection_options: additional keyword arguments to be passed to
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``kombu.Connection()``.
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:param exchange_options: additional keyword arguments to be passed to
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``kombu.Exchange()``.
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:param queue_options: additional keyword arguments to be passed to
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``kombu.Queue()``.
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:param producer_options: additional keyword arguments to be passed to
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``kombu.Producer()``.
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"""
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name = 'kombu'
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def __init__(self, url='amqp://guest:guest@localhost:5672//',
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channel='socketio', write_only=False, logger=None,
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connection_options=None, exchange_options=None,
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queue_options=None, producer_options=None):
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if kombu is None:
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raise RuntimeError('Kombu package is not installed '
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'(Run "pip install kombu" in your '
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'virtualenv).')
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super(KombuManager, self).__init__(channel=channel,
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write_only=write_only,
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logger=logger)
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self.url = url
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self.connection_options = connection_options or {}
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self.exchange_options = exchange_options or {}
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self.queue_options = queue_options or {}
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self.producer_options = producer_options or {}
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self.producer = self._producer()
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def initialize(self):
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super(KombuManager, self).initialize()
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monkey_patched = True
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if self.server.async_mode == 'eventlet':
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from eventlet.patcher import is_monkey_patched
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monkey_patched = is_monkey_patched('socket')
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elif 'gevent' in self.server.async_mode:
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from gevent.monkey import is_module_patched
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monkey_patched = is_module_patched('socket')
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if not monkey_patched:
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raise RuntimeError(
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'Kombu requires a monkey patched socket library to work '
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'with ' + self.server.async_mode)
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def _connection(self):
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return kombu.Connection(self.url, **self.connection_options)
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def _exchange(self):
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options = {'type': 'fanout', 'durable': False}
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options.update(self.exchange_options)
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return kombu.Exchange(self.channel, **options)
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def _queue(self):
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queue_name = 'flask-socketio.' + str(uuid.uuid4())
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options = {'durable': False, 'queue_arguments': {'x-expires': 300000}}
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options.update(self.queue_options)
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return kombu.Queue(queue_name, self._exchange(), **options)
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def _producer(self):
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return self._connection().Producer(exchange=self._exchange(),
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**self.producer_options)
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def __error_callback(self, exception, interval):
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self._get_logger().exception('Sleeping {}s'.format(interval))
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def _publish(self, data):
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connection = self._connection()
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publish = connection.ensure(self.producer, self.producer.publish,
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errback=self.__error_callback)
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publish(pickle.dumps(data))
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def _listen(self):
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reader_queue = self._queue()
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while True:
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connection = self._connection().ensure_connection(
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errback=self.__error_callback)
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try:
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with connection.SimpleQueue(reader_queue) as queue:
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while True:
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message = queue.get(block=True)
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message.ack()
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yield message.payload
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except connection.connection_errors:
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self._get_logger().exception("Connection error "
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"while reading from queue")
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