128 lines
3.6 KiB
Python
128 lines
3.6 KiB
Python
from eventlet import patcher
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puka = patcher.import_patched('puka')
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#import puka
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import anyjson
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import config
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class RmqClient(object):
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def __init__(self):
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settings = config.CONF.rabbitmq
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self._client = puka.Client('amqp://{0}:{1}@{2}:{3}/{4}'.format(
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settings.login,
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settings.password,
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settings.host,
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settings.port,
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settings.virtual_host
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))
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self._connected = False
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def __enter__(self):
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self.connect()
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.close()
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return False
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def connect(self):
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if not self._connected:
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promise = self._client.connect()
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self._client.wait(promise, timeout=10000)
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self._connected = True
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def close(self):
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if self._connected:
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self._client.close()
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self._connected = False
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def declare(self, queue, exchange=None):
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promise = self._client.queue_declare(str(queue), durable=True)
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self._client.wait(promise)
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if exchange:
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promise = self._client.exchange_declare(str(exchange), durable=True)
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self._client.wait(promise)
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promise = self._client.queue_bind(
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str(queue), str(exchange), routing_key=str(queue))
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self._client.wait(promise)
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def send(self, message, key, exchange='', timeout=None):
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if not self._connected:
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raise RuntimeError('Not connected to RabbitMQ')
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headers = { 'message_id': message.id }
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promise = self._client.basic_publish(
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exchange=str(exchange),
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routing_key=str(key),
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body=anyjson.dumps(message.body),
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headers=headers)
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self._client.wait(promise, timeout=timeout)
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def open(self, queue):
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if not self._connected:
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raise RuntimeError('Not connected to RabbitMQ')
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return Subscription(self._client, queue)
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class Subscription(object):
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def __init__(self, client, queue):
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self._client = client
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self._queue = queue
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self._promise = None
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self._lastMessage = None
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def __enter__(self):
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self._promise = self._client.basic_consume(
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queue=self._queue,
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prefetch_count=1)
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self._ack_last()
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promise = self._client.basic_cancel(self._promise)
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self._client.wait(promise)
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return False
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def _ack_last(self):
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if self._lastMessage:
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self._client.basic_ack(self._lastMessage)
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self._lastMessage = None
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def get_message(self, timeout=None):
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if not self._promise:
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raise RuntimeError(
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"Subscription object must be used within 'with' block")
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self._ack_last()
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self._lastMessage = self._client.wait(self._promise, timeout=timeout)
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#print self._lastMessage
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msg = Message()
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msg.body = anyjson.loads(self._lastMessage['body'])
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msg.id = self._lastMessage['headers'].get('message_id')
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return msg
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class Message(object):
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def __init__(self):
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self._body = {}
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self._id = ''
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@property
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def body(self):
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return self._body
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@body.setter
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def body(self, value):
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self._body = value
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@property
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def id(self):
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return self._id
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@id.setter
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def id(self, value):
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self._id = value or ''
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