pythonasyncioeventletgeventlong-pollinglow-latencysocket-iosocketiosocketio-serverweb-serverwebsocket
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87 lines
3.3 KiB
87 lines
3.3 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 ot ``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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"""
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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):
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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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self.url = url
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self.producer = self._producer()
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def initialize(self, server):
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super(KombuManager, self).initialize(server)
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monkey_patched = True
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if 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 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('Redis requires a monkey patched socket '
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'library to work with ' + server.async_mode)
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def _connection(self):
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return kombu.Connection(self.url)
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def _exchange(self):
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return kombu.Exchange(self.channel, type='fanout', durable=False)
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def _queue(self):
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queue_name = 'flask-socketio.' + str(uuid.uuid4())
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return kombu.Queue(queue_name, self._exchange(),
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queue_arguments={'x-expires': 300000})
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def _producer(self):
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return self._connection().Producer(exchange=self._exchange())
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def _publish(self, data):
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self.producer.publish(pickle.dumps(data))
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def _listen(self):
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reader_queue = self._queue()
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with self._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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