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import pika connection=pika.BlockingConnection(pika.ConnectionParameters(host=‘192.168.40.128‘)) channel =connection.channel() channel.queue_declare(queue=‘hello‘) def callback(ch,method,properties,body): print(body) channel.basic_consume( callback, queue=‘hello‘, no_ack=True ) channel.start_consuming()
import pika connection=pika.BlockingConnection(pika.ConnectionParameters( host=‘192.168.40.128‘)) channel=connection.channel() channel.queue_declare(queue=‘hello‘) channel.basic_publish( exchange=‘‘, routing_key=‘hello‘, body=‘haha‘) print(123) connection.close()
2、durable 消息不丢失
#!/usr/bin/env python import pika connection = pika.BlockingConnection(pika.ConnectionParameters(host=‘10.211.55.4‘)) channel = connection.channel() # make message persistent channel.queue_declare(queue=‘hello‘, durable=True) channel.basic_publish(exchange=‘‘, routing_key=‘hello‘, body=‘Hello World!‘, properties=pika.BasicProperties( delivery_mode=2, # make message persistent )) print(" [x] Sent ‘Hello World!‘") connection.close()
#!/usr/bin/env python # -*- coding:utf-8 -*- import pika connection = pika.BlockingConnection(pika.ConnectionParameters(host=‘10.211.55.4‘)) channel = connection.channel() # make message persistent channel.queue_declare(queue=‘hello‘, durable=True) def callback(ch, method, properties, body): print(" [x] Received %r" % body) import time time.sleep(10) print ‘ok‘ ch.basic_ack(delivery_tag = method.delivery_tag) channel.basic_consume(callback, queue=‘hello‘, no_ack=False) print(‘ [*] Waiting for messages. To exit press CTRL+C‘) channel.start_consuming()
3、消息获取顺序
默认消息队列里的数据是按照顺序被消费者拿走，例如：消费者1 去队列中获取 奇数 序列的任务，消费者1去队列中获取 偶数 序列的任务。
channel.basic_qos(prefetch_count=1) 表示谁来谁取，不再按照奇偶数排列
#!/usr/bin/env python # -*- coding:utf-8 -*- import pika connection = pika.BlockingConnection(pika.ConnectionParameters(host=‘10.211.55.4‘)) channel = connection.channel() # make message persistent channel.queue_declare(queue=‘hello‘) def callback(ch, method, properties, body): print(" [x] Received %r" % body) import time time.sleep(10) print ‘ok‘ ch.basic_ack(delivery_tag = method.delivery_tag) channel.basic_qos(prefetch_count=1) channel.basic_consume(callback, queue=‘hello‘, no_ack=False) print(‘ [*] Waiting for messages. To exit press CTRL+C‘) channel.start_consuming()
4、发布订阅
发布订阅和简单的消息队列区别在于，发布订阅会将消息发送给所有的订阅者，而消息队列中的数据被消费一次便消失。所以，RabbitMQ实现发布和订阅时，会为每一个订阅者创建一个队列，而发布者发布消息时，会将消息放置在所有相关队列中
exchange type = fanout
#!/usr/bin/env python import pika import sys connection = pika.BlockingConnection(pika.ConnectionParameters( host=‘192.168.40.128‘)) channel = connection.channel() channel.exchange_declare(exchange=‘logs‘, type=‘fanout‘) message =‘123‘ channel.basic_publish(exchange=‘logs‘, routing_key=‘‘, body=message) print(" [x] Sent %r" % message) connection.close()
#!/usr/bin/env python import pika connection = pika.BlockingConnection(pika.ConnectionParameters( host=‘192.168.40.128‘)) channel = connection.channel() channel.exchange_declare(exchange=‘logs‘, type=‘fanout‘) result = channel.queue_declare(exclusive=True) queue_name = result.method.queue channel.queue_bind(exchange=‘logs‘, queue=queue_name) print(‘ [*] Waiting for logs. To exit press CTRL+C‘) def callback(ch, method, properties, body): print(" [x] %r" % body) channel.basic_consume(callback, queue=queue_name, no_ack=True) channel.start_consuming()
5、关键字发送
exchange type = direct
之前事例，发送消息时明确指定某个队列并向其中发送消息，RabbitMQ还支持根据关键字发送，即：队列绑定关键字，发送者将数据根据关键字发送到消息exchange，exchange根据 关键字 判定应该将数据发送至指定队列。
#!/usr/bin/env python import pika import sys connection = pika.BlockingConnection(pika.ConnectionParameters( host=‘localhost‘)) channel = connection.channel() channel.exchange_declare(exchange=‘direct_logs‘, type=‘direct‘) severity = sys.argv[1] if len(sys.argv) > 1 else ‘info‘ message = ‘ ‘.join(sys.argv[2:]) or ‘Hello World!‘ channel.basic_publish(exchange=‘direct_logs‘, routing_key=severity, body=message) print(" [x] Sent %r:%r" % (severity, message)) connection.close()
#!/usr/bin/env python import pika import sys connection = pika.BlockingConnection(pika.ConnectionParameters( host=‘localhost‘)) channel = connection.channel() channel.exchange_declare(exchange=‘direct_logs‘, type=‘direct‘) result = channel.queue_declare(exclusive=True) queue_name = result.method.queue severities = sys.argv[1:] if not severities: sys.stderr.write("Usage: %s [info] [warning] [error]\n" % sys.argv[0]) sys.exit(1) for severity in severities: channel.queue_bind(exchange=‘direct_logs‘, queue=queue_name, routing_key=severity) print(‘ [*] Waiting for logs. To exit press CTRL+C‘) def callback(ch, method, properties, body): print(" [x] %r:%r" % (method.routing_key, body)) channel.basic_consume(callback, queue=queue_name, no_ack=True) channel.start_consuming()
6、模糊匹配
exchange type = topic
在topic类型下，可以让队列绑定几个模糊的关键字，之后发送者将数据发送到exchange，exchange将传入”路由值“和 ”关键字“进行匹配，匹配成功，则将数据发送到指定队列。
发送者路由值 队列中 old.boy.python old.* -- 不匹配 old.boy.python old.# -- 匹配
#!/usr/bin/env python import pika import sys connection = pika.BlockingConnection(pika.ConnectionParameters( host=‘localhost‘)) channel = connection.channel() channel.exchange_declare(exchange=‘topic_logs‘, type=‘topic‘) result = channel.queue_declare(exclusive=True) queue_name = result.method.queue binding_keys = sys.argv[1:] if not binding_keys: sys.stderr.write("Usage: %s [binding_key]...\n" % sys.argv[0]) sys.exit(1) for binding_key in binding_keys: channel.queue_bind(exchange=‘topic_logs‘, queue=queue_name, routing_key=binding_key) print(‘ [*] Waiting for logs. To exit press CTRL+C‘) def callback(ch, method, properties, body): print(" [x] %r:%r" % (method.routing_key, body)) channel.basic_consume(callback, queue=queue_name, no_ack=True) channel.start_consuming()
#!/usr/bin/env python import pika import sys connection = pika.BlockingConnection(pika.ConnectionParameters( host=‘localhost‘)) channel = connection.channel() channel.exchange_declare(exchange=‘topic_logs‘, type=‘topic‘) routing_key = sys.argv[1] if len(sys.argv) > 1 else ‘anonymous.info‘ message = ‘ ‘.join(sys.argv[2:]) or ‘Hello World!‘ channel.basic_publish(exchange=‘topic_logs‘, routing_key=routing_key, body=message) print(" [x] Sent %r:%r" % (routing_key, message)) connection.close()
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原文地址：http://www.cnblogs.com/zhaozhenguo666/p/5700796.html
