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POCode Design: resend a message to Rabbit from try except block
 

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  1. POCode Design: resend a message to Rabbit from try except block
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    <p>I'm looking for any help. I want to fix an <code>insert_order_queue()</code> function to be able to resend a message to <code>RabbitMQ</code> if the message wasn't actually got delivered to the server.</p> <p>This is my current code:</p> <pre><code>def insert_order_queue(self, msg): ''' Insert message into the queue ''' if msg: msg_props = pika.BasicProperties(delivery_mode=conf.rabbit_msg_props_delivery_mode, content_type=conf.rabbit_msg_props_content_type) logger.info('Message : %s' % msg) try: self.channel.basic_publish(body=json.dumps(msg), exchange=conf.rabbit_exchange_name, properties=msg_props, routing_key=conf.rabbit_exchange_routing_key) except (pika.exceptions.AMQPConnectionError, pika.exceptions.AMQPChannelError), error: logger.error('AMQP Connection failed. Trying again... %s' % error) self._connect() return else: logger.error('Something wrong') </code></pre> <p>And this is my <code>_connect()</code> method:</p> <pre><code>def _connect(self): ''' Connecting to the RabbitMQ, and declare queue ''' logger.info('Trying to connect to RabbitMQ') while True: try: conn_broker = pika.BlockingConnection( pika.ConnectionParameters( host=conf.rabbit_server, port=conf.rabbit_port, virtual_host=conf.rabbit_vhost, ssl=conf.rabbit_ssl, # do not set it to True if there is no ssl! heartbeat_interval=conf.rabbit_heartbeat_interval, credentials=pika.PlainCredentials( conf.rabbit_user, conf.rabbit_pass))) logger.info('Successfully connected to Rabbit at %s:%s' % (conf.rabbit_server, conf.rabbit_port)) channel = conn_broker.channel() # Don't dispatch a new message to a worker until it has processed and acknowledged the previous one channel.basic_qos(prefetch_count=conf.rabbit_prefetch_count) status = channel.queue_declare(queue=conf.rabbit_queue_name, durable=conf.rabbit_queue_durable, exclusive=conf.rabbit_queue_exclusive, passive=conf.rabbit_queue_passive) if status.method.message_count == 0: logger.info("Queue empty") else: logger.info('Queue status: %s' % status) channel.queue_bind( queue=conf.rabbit_queue_name, exchange=conf.rabbit_exchange_name, routing_key=conf.rabbit_exchange_routing_key) return channel except (pika.exceptions.AMQPConnectionError, pika.exceptions.AMQPChannelError), error: time.sleep(3) logger.error('Exception while connecting to Rabbit %s' % error) else: break </code></pre>
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