标签：publish 支持 .com 模糊 fanout env form 话题 管理
话题模式（Topic）基本思想和路由模式是一样的，只不过路由键支持模糊匹配，符号“#”匹配一个或多个词，符号“*”匹配不多不少一个词
话题模式相当于消息的模糊匹配，或者按照正则匹配。其中
# 是通配符，匹配一个或者多个单词
* 代表匹配一个单词
模式提醒：
当使用#来收消息时，会接收到所有的消息，这样和fanout模式一样了。
当routing key中不含*或者#时，则topic的模式退化为direct的一对一模式。
队列模型：
发布者：
1 #!/usr/bin/env python 2 import pika 3 import sys 4 5 connection = pika.BlockingConnection(pika.ConnectionParameters(host=‘localhost‘)) 6 channel = connection.channel() 7 8 channel.exchange_declare(exchange=‘topic_logs‘, 9 exchange_type=‘topic‘) 10 11 routing_key = [‘#‘, "kern.critical", "A critical kernel error"] 12 for i in range(10): 13 message = ‘{} msg at : routing key {}‘.format(i, routing_key[i % 3]) 14 channel.basic_publish(exchange=‘topic_logs‘, 15 routing_key=routing_key[i % 3], 16 body=message) 17 print(" [x] Sent :%r" % (message)) 18 connection.close()
消费者：
1 import pika 2 import sys 3 4 connection = pika.BlockingConnection(pika.ConnectionParameters(host=‘localhost‘)) 5 channel = connection.channel() 6 7 channel.exchange_declare(exchange=‘topic_logs‘, 8 exchange_type=‘topic‘) 9 10 result = channel.queue_declare(exclusive=True) 11 queue_name = result.method.queue 12 13 binding_key = "#" 14 15 channel.queue_bind(exchange=‘topic_logs‘, 16 queue=queue_name, 17 routing_key=binding_key) 18 19 print(‘ [*] Waiting for logs. To exit press CTRL+C‘) 20 21 def callback(ch, method, properties, body): 22 print(" [x] %r:%r" % (method.routing_key, body)) 23 24 channel.basic_consume(callback, 25 queue=queue_name, 26 no_ack=True) 27 28 channel.start_consuming()
发布者输出：
[x] Sent :‘0 msg at : routing key #‘ [x] Sent :‘1 msg at : routing key kern.critical‘ [x] Sent :‘2 msg at : routing key error.critical‘ [x] Sent :‘3 msg at : routing key #‘ [x] Sent :‘4 msg at : routing key kern.critical‘ [x] Sent :‘5 msg at : routing key error.critical‘ [x] Sent :‘6 msg at : routing key #‘ [x] Sent :‘7 msg at : routing key kern.critical‘ [x] Sent :‘8 msg at : routing key error.critical‘ [x] Sent :‘9 msg at : routing key #‘
消费者输出：
all：可以看到接收到所有的消息
[*] Waiting for logs. To exit press CTRL+C [x] ‘#‘:b‘0 msg at : routing key #‘ [x] ‘kern.critical‘:b‘1 msg at : routing key kern.critical‘ [x] ‘error.critical‘:b‘2 msg at : routing key error.critical‘ [x] ‘#‘:b‘3 msg at : routing key #‘ [x] ‘kern.critical‘:b‘4 msg at : routing key kern.critical‘ [x] ‘error.critical‘:b‘5 msg at : routing key error.critical‘ [x] ‘#‘:b‘6 msg at : routing key #‘ [x] ‘kern.critical‘:b‘7 msg at : routing key kern.critical‘ [x] ‘error.critical‘:b‘8 msg at : routing key error.critical‘ [x] ‘#‘:b‘9 msg at : routing key #‘
消费者“critical”，只接收含critical的消息
[*] Waiting for logs. To exit press CTRL+C [x] ‘kern.critical‘:b‘1 msg at : routing key kern.critical‘ [x] ‘error.critical‘:b‘2 msg at : routing key error.critical‘ [x] ‘kern.critical‘:b‘4 msg at : routing key kern.critical‘ [x] ‘error.critical‘:b‘5 msg at : routing key error.critical‘ [x] ‘kern.critical‘:b‘7 msg at : routing key kern.critical‘ [x] ‘error.critical‘:b‘8 msg at : routing key error.critical‘
消费者“kern”，只接收含kern的消息
[*] Waiting for logs. To exit press CTRL+C [x] ‘kern.critical‘:b‘1 msg at : routing key kern.critical‘ [x] ‘kern.critical‘:b‘4 msg at : routing key kern.critical‘ [x] ‘kern.critical‘:b‘7 msg at : routing key kern.critical‘
三、队列信息
在管理页面上可以看到三个队列信息，routing key对应着三个队列的配置
标签：publish 支持 .com 模糊 fanout env form 话题 管理
原文地址：https://www.cnblogs.com/StitchSun/p/10293495.html
