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88 lines
3.0 KiB
Python
88 lines
3.0 KiB
Python
from __future__ import unicode_literals
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import importlib
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import threading
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from django.conf import settings
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from .exceptions import DenyConnection
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from .signals import consumer_started, consumer_finished, message_sent
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class ConsumerMiddlewareRegistry(object):
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"""
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Handles registration (via settings object) and generation of consumer
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middleware stacks
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"""
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fixed_middleware = ["channels.consumer_middleware.ConvenienceMiddleware"]
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def __init__(self):
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# Load middleware callables from settings
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middleware_paths = self.fixed_middleware + getattr(settings, "CONSUMER_MIDDLEWARE", [])
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self.middleware_instances = []
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for path in middleware_paths:
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module_name, variable_name = path.rsplit(".", 1)
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try:
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self.middleware_instances.append(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 consumer middleware %r: %s" % (path, e))
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def make_chain(self, consumer, kwargs):
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"""
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Returns an instantiated chain of middleware around a final consumer.
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"""
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next_layer = lambda message: consumer(message, **kwargs)
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for middleware_instance in reversed(self.middleware_instances):
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next_layer = middleware_instance(next_layer)
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return next_layer
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class ConvenienceMiddleware(object):
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"""
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Standard middleware which papers over some more explicit parts of ASGI.
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"""
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runtime_data = threading.local()
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def __init__(self, consumer):
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self.consumer = consumer
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def __call__(self, message):
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print("conven", message.channel)
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if message.channel.name == "websocket.connect":
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# Websocket connect acceptance helper
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try:
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self.consumer(message)
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print ("messages sent", self.get_messages())
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except DenyConnection:
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message.reply_channel.send({"accept": False})
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else:
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# General path
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return self.consumer(message)
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@classmethod
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def reset_messages(cls, **kwargs):
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"""
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Tied to the consumer started/ended signal to reset the messages list.
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"""
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cls.runtime_data.sent_messages = []
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consumer_started.connect(lambda **kwargs: reset_messages())
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consumer_finished.connect(lambda **kwargs: reset_messages())
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@classmethod
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def sent_message(cls, channel, keys, **kwargs):
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"""
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Called by message sending interfaces when messages are sent,
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for convenience errors only. Should not be relied upon to get
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all messages.
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"""
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cls.runtime_data.sent_messages = getattr(cls.runtime_data, "sent_messages", []) + [(channel, keys)]
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print ("saved now", cls.runtime_data.sent_messages)
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message_sent.connect(lambda channel, keys, **kwargs: sent_message(channel, keys))
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@classmethod
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def get_messages(cls):
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return getattr(cls.runtime_data, "sent_messages", [])
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