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41 lines
1.1 KiB
Python
41 lines
1.1 KiB
Python
from channels.consumer_registry import ConsumerRegistry
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class ChannelClosed(Exception):
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"""
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Raised when you try to send to a closed channel.
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"""
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pass
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class BaseChannelBackend(object):
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"""
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Base class for all channel layer implementations. Manages both sending
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and receving messages from the backend, and each comes with its own
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registry of consumers.
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"""
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# Flags if this backend can only be used inside one process.
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# Causes errors if you try to run workers/interfaces separately with it.
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local_only = False
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def __init__(self, expiry=60):
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self.registry = ConsumerRegistry()
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self.expiry = expiry
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def send(self, channel, message):
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"""
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Send a message over the channel, taken from the kwargs.
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"""
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raise NotImplementedError()
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def receive_many(self, channels):
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"""
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Block and return the first message available on one of the
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channels passed, as a (channel, message) tuple.
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"""
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raise NotImplementedError()
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def __str__(self):
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return self.__class__.__name__
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