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4baeaaa532
Requires Pika 0.9.6 or later. (imported from commit 316ab9f2a6b5c2a25ae8584e2604222b33e0dec3)
101 lines
3.5 KiB
Python
101 lines
3.5 KiB
Python
from django.conf import settings
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import pika
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import logging
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import simplejson
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import random
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# This simple queuing library doesn't expose much of the power of
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# rabbitmq/pika's queuing system; its purpose is to just provide an
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# interface for external files to put things into queues and take them
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# out from bots without having to import pika code all over our codebase.
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class SimpleQueueClient(object):
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def __init__(self):
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self.log = logging.getLogger('humbug.queue')
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self.queues = set()
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self.channel = None
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self._connect()
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def _connect(self):
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self.connection = pika.BlockingConnection(self._get_parameters())
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self.channel = self.connection.channel()
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self.log.info('SimpleQueueClient connected')
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def _get_parameters(self):
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return pika.ConnectionParameters('localhost',
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credentials = pika.PlainCredentials(
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'humbug', settings.RABBITMQ_PASSWORD))
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def _generate_ctag(self, queue_name):
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return "%s_%s" % (queue_name, str(random.getrandbits(16)))
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def ready(self):
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return self.channel is not None
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def ensure_queue(self, queue_name, callback):
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'''Ensure that a given queue has been declared, and then call
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the callback with no arguments.'''
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if queue_name not in self.queues:
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self.channel.queue_declare(queue=queue_name, durable=True)
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self.queues.add(queue_name)
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callback()
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def publish(self, queue_name, body):
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self.ensure_queue(queue_name,
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lambda: self.channel.basic_publish(
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exchange='',
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routing_key=queue_name,
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properties=pika.BasicProperties(delivery_mode=2),
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body=body))
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def json_publish(self, queue_name, body):
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return self.publish(queue_name, simplejson.dumps(body))
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def register_consumer(self, queue_name, consumer):
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def wrapped_consumer(ch, method, properties, body):
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consumer(ch, method, properties, body)
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ch.basic_ack(delivery_tag=method.delivery_tag)
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self.ensure_queue(queue_name,
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lambda: self.channel.basic_consume(wrapped_consumer, queue=queue_name,
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consumer_tag=self._generate_ctag(queue_name)))
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def register_json_consumer(self, queue_name, callback):
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def wrapped_callback(ch, method, properties, body):
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return callback(ch, method, properties, simplejson.loads(body))
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return self.register_consumer(queue_name, wrapped_callback)
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def start_consuming(self):
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self.channel.start_consuming()
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def stop_consuming(self):
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self.channel.stop_consuming()
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class TornadoQueueClient(SimpleQueueClient):
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# Based on:
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# https://pika.readthedocs.org/en/0.9.8/examples/asynchronous_consumer_example.html
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def _connect(self):
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self.connection = pika.adapters.TornadoConnection(
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self._get_parameters(),
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on_open_callback = self._on_open,
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stop_ioloop_on_close = False)
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def _on_open(self, connection):
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self.connection.channel(
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on_open_callback = self._on_channel_open)
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def _on_channel_open(self, channel):
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self.channel = channel
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self.log.info('TornadoQueueClient connected')
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def ensure_queue(self, queue_name, callback):
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def finish(frame):
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self.queues.add(queue_name)
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callback()
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if queue_name not in self.queues:
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self.channel.queue_declare(queue=queue_name, durable=True,
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callback=finish)
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else:
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callback()
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