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71 lines
2.6 KiB
Python
71 lines
2.6 KiB
Python
import importlib
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from django.core.exceptions import ImproperlyConfigured
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from django.utils import six
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from .utils import name_that_thing
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class ConsumerRegistry(object):
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"""
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Manages the available consumers in the project and which channels they
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listen to.
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Generally this is attached to a backend instance as ".registry"
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"""
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def __init__(self, routing=None):
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self.consumers = {}
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# Add basic internal consumers
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self.add_consumer(self.echo_consumer, ["__channels__.echo"])
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# Initialise with any routing that was passed in
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if routing:
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# If the routing was a string, import it
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if isinstance(routing, six.string_types):
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module_name, variable_name = routing.rsplit(".", 1)
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try:
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routing = getattr(importlib.import_module(module_name), variable_name)
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except (ImportError, AttributeError) as e:
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raise ImproperlyConfigured("Cannot import channel routing %r: %s" % (routing, e))
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# Load consumers into us
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for channel, handler in routing.items():
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self.add_consumer(handler, [channel])
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def add_consumer(self, consumer, channels):
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# Upconvert if you just pass in a string for channels
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if isinstance(channels, six.string_types):
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channels = [channels]
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# Import any consumer referenced as string
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if isinstance(consumer, six.string_types):
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module_name, variable_name = consumer.rsplit(".", 1)
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try:
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consumer = getattr(importlib.import_module(module_name), variable_name)
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except (ImportError, AttributeError):
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raise ImproperlyConfigured("Cannot import consumer %r" % consumer)
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# Register on each channel, checking it's unique
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for channel in channels:
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if channel in self.consumers:
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raise ValueError("Cannot register consumer %s - channel %r already consumed by %s" % (
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name_that_thing(consumer),
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channel,
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name_that_thing(self.consumers[channel]),
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))
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self.consumers[channel] = consumer
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def all_channel_names(self):
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return self.consumers.keys()
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def consumer_for_channel(self, channel):
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try:
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return self.consumers[channel]
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except KeyError:
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return None
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def echo_consumer(self, message):
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"""
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Implements the echo message standard.
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"""
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message.reply_channel.send({
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"content": message.content.get("content", None),
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})
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