rabbitmq之发布订阅

一、基本模式

1、发布者

import pika

credentials = pika.PlainCredentials("admin","admin")
connection = pika.BlockingConnection(pika.ConnectionParameters('101.133.225.166',credentials=credentials))
channel = connection.channel()
# exchange='m1'，秘书的名称
# exchange_type='fanout'，秘书工作方式将消息发送给所有的队列
channel.exchange_declare(exchange='m1',exchange_type='fanout')
channel.basic_publish(exchange='m1',routing_key='',body='lqz nb')
connection.close()

2、订阅者：启动几次订阅者就会生成几个队列

import pika

credentials = pika.PlainCredentials("admin","admin")
connection = pika.BlockingConnection(pika.ConnectionParameters('101.133.225.166',credentials=credentials))
channel = connection.channel()
channel.exchange_declare(exchange='m1',exchange_type='fanout')
# 随机生成一个队列
result = channel.queue_declare(queue='',exclusive=True)
queue_name = result.method.queue
# 让exchange和queque进行绑定.
channel.queue_bind(exchange='m1',queue=queue_name)

def callback(ch, method, properties, body):
    print("消费者接受到了任务: %r" % body)

channel.basic_consume(queue=queue_name,on_message_callback=callback,auto_ack=True)
channel.start_consuming()

二、高级模式之Routing(按关键字匹配)

1、发布者

import pika

credentials = pika.PlainCredentials("admin","admin")
connection = pika.BlockingConnection(pika.ConnectionParameters('101.133.225.166',credentials=credentials))
channel = connection.channel()
channel.exchange_declare(exchange='m2',exchange_type='direct')
# 多个关键字，指定routing_key
channel.basic_publish(exchange='m2', routing_key='bnb', body='lqz nb')

connection.close()

2、订阅者1

import pika

credentials = pika.PlainCredentials("admin","admin")
connection = pika.BlockingConnection(pika.ConnectionParameters('101.133.225.166',credentials=credentials))
channel = connection.channel()
channel.exchange_declare(exchange='m2',exchange_type='direct')
result = channel.queue_declare(queue='',exclusive=True)
queue_name = result.method.queue
channel.queue_bind(exchange='m2',queue=queue_name,routing_key='nb')
channel.queue_bind(exchange='m2',queue=queue_name,routing_key='bnb')


def callback(ch, method, properties, body):
    print("消费者接受到了任务: %r" % body)

channel.basic_consume(queue=queue_name,on_message_callback=callback,auto_ack=True)
channel.start_consuming()

3、订阅者2

import pika

credentials = pika.PlainCredentials("admin","admin")
connection = pika.BlockingConnection(pika.ConnectionParameters('101.133.225.166',credentials=credentials))
channel = connection.channel()
channel.exchange_declare(exchange='m2',exchange_type='direct')
result = channel.queue_declare(queue='',exclusive=True)
queue_name = result.method.queue
channel.queue_bind(exchange='m2',queue=queue_name,routing_key='nb')
      
def callback(ch, method, properties, body):
    print("消费者接受到了任务: %r" % body)

channel.basic_consume(queue=queue_name,on_message_callback=callback,auto_ack=True)
channel.start_consuming()

三、高级模式之Topic(按关键字模糊匹配)

1、发布者

import pika

credentials = pika.PlainCredentials("admin","admin")
connection = pika.BlockingConnection(pika.ConnectionParameters('101.133.225.166',credentials=credentials))
channel = connection.channel()
channel.exchange_declare(exchange='m3',exchange_type='topic')
channel.basic_publish(exchange='m3',
                      # routing_key='lqz.handsome', # 都能收到
                      routing_key='lqz.handsome.xx', # 只有lqz.#能收到
                      body='lqz nb')
connection.close()

2、订阅者1

import pika

credentials = pika.PlainCredentials("admin","admin")
connection = pika.BlockingConnection(pika.ConnectionParameters('101.133.225.166',credentials=credentials))
channel = connection.channel()
channel.exchange_declare(exchange='m3',exchange_type='topic')
result = channel.queue_declare(queue='',exclusive=True)
queue_name = result.method.queue
# *只能加一个单词
# #可以加任意单词字符
channel.queue_bind(exchange='m3',queue=queue_name,routing_key='lqz.*')

def callback(ch, method, properties, body):
    print("消费者接受到了任务: %r" % body)

channel.basic_consume(queue=queue_name,on_message_callback=callback,auto_ack=True)

channel.start_consuming()

3、订阅者2

import pika

credentials = pika.PlainCredentials("admin","admin")
connection = pika.BlockingConnection(pika.ConnectionParameters('101.133.225.166',credentials=credentials))
channel = connection.channel()
channel.exchange_declare(exchange='m3',exchange_type='topic')
result = channel.queue_declare(queue='',exclusive=True)
queue_name = result.method.queue
channel.queue_bind(exchange='m3',queue=queue_name,routing_key='lqz.#')

def callback(ch, method, properties, body):
    print("消费者接受到了任务: %r" % body)

channel.basic_consume(queue=queue_name,on_message_callback=callback,auto_ack=True)
channel.start_consuming()