openresty 学习笔记番外篇:python访问RabbitMQ消息队列
openresty 学习笔记番外篇:python访问RabbitMQ消息队列
python使用pika扩展库操作RabbitMQ的流程梳理。
- 客户端连接到消息队列服务器,打开一个channel。
- 客户端声明一个exchange,并设置相关属性。(可以省略,不过必须保证所指定的交换器存在)
- 客户端声明一个queue,并设置相关属性。(可以省略,不过必须保证所指定的队列存在)
- 客户端使用routing key,在exchange和queue之间建立好绑定关系。(可以省略,不过必须保证其绑定关系)
作为生产者
客户端投递消息到exchange。
作为消费者
客户端通过队列接收消息,处理后进行应答。
producerConn = pika.BlockingConnection(pika.ConnectionParameters('localhost')) producerChannel = consumerConn.channel() producerChannel.exchange_declare(exchange = 'exchangeName', type = 'topic', durable=True, auto_delete=False) producerChannel.queue_declare(queue = 'queueName', durable=True) producerChannel.queue_bind(exchange = 'exchangeName', queue = 'queueName', routing_key = 'key') msg_props = pika.BasicProperties() msg_props.content_type = "application/json" producerChannel.basic_publish(exchange = 'exchangeName', routing_key = 'key', body = '{"name": "android"}', properties = msg_props)
作为消费者需要定义一个回调函数
def callback(ch, method, properties, body): mainLogger.info(body) ch.basic_ack(delivery_tag = method.delivery_tag) consumerConn = pika.BlockingConnection(pika.ConnectionParameters('localhost')) consumerChannel = consumerConn.channel() consumerChannel.exchange_declare(exchange = 'exchangeName', type = 'topic', durable=True, auto_delete=False) consumerChannel.queue_declare(queue = 'queueName', durable=True) consumerChannel.queue_bind(exchange = 'exchangeName', queue = 'queueName', routing_key = 'key') consumerChannel.basic_qos(prefetch_count=1) consumerChannel.basic_consume(callback , queue = 'queueName') consumerChannel.start_consuming()
官方文档:
http://www.rabbitmq.com/tutorials/tutorial-one-python.html