PYTHON-RABBITMQ publication and subscription of Message Queuing

RABBITMQ the publication and subscription of Message Queuing is similar to broadcasting, one end sends messages, and multiple clients can receive messages at the same time

Fanout: All queues that are bound to exchange can receive messages

Message Publishing Side

#-*-Coding:utf-8-*-__author__ = "MuT6 sch01ar" Import pikaconnection = Pika. Blockingconnection (Pika. Connectionparameters (host= ' 127.0.0.1 ')) Channel = Connection.channel () channel.exchange_declare (exchange= ' Fanout_ Logs ', exchange_type= ' fanout ') message = ' Hello world! ' Channel.basic_publish (exchange= ' fanout_logs ',                      routing_key= ',                      body=message) print (' Send message: ', message) Connection.close ()

Message subscribers

#-*-Coding:utf-8-*-__author__ = "MuT6 sch01ar" Import pikaconnection = Pika. Blockingconnection (Pika. Connectionparameters (host= ' 127.0.0.1 ')) Channel = Connection.channel () channel.exchange_declare (exchange= ' Fanout_ Logs ', exchange_type= ' fanout ') result = Channel.queue_declare (exclusive=true)  # does not specify a queue name, RABBITMQ randomly assigns a name # Exclusive=true will automatically delete the queue after the message subscriber using this queue is disconnected queue_name = result.method.queueprint (' Current queue name: ', queue_name) Channel.queue_bind (exchange= ' fanout_logs ', Queue=queue_name) def callback (ch, method, properties, body):    print ( CH, method, properties)    print (' Received data: ', body) Channel.basic_consume (callback,                      Queue=queue_name,                      no_ack= True,                      ) print (' Start waiting for message ') channel.start_consuming ()

The message Publisher needs to run after the message Subscriber is running, or the message will not receive the message at the subscriber end

Open 3 message subscribers and one message publisher

Message Publishing End Publishing message

3 Message subscribers receive a message at the same time

Direct: The specified queue to receive messages

The queue binding keyword, the message publisher sends a message to the exchange,exchange based on the keyword send a message to the specified queue based on the keyword

Message Publishing Side

#-*-Coding:utf-8-*-__author__ = "MuT6 sch01ar" import pikaimport sysconnection = Pika. Blockingconnection (Pika. Connectionparameters (host= ' 127.0.0.1 ')) Channel = Connection.channel () channel.exchange_declare (exchange= ' direct_ Logs ', exchange_type= ' direct ') severity = sys.argv[1] If len (SYS.ARGV) > 1 Else ' info '  # keyword message = ' Hello world! ' Channel.basic_publish (exchange= ' direct_logs ',                      routing_key=severity,                      body=message) print (' level [%s] Send data [%s] '% (severity, message)) Connection.close ()

Message subscribers

#-*-Coding:utf-8-*-__author__ = "MuT6 sch01ar" import pikaimport sysconnection = Pika. Blockingconnection (Pika. Connectionparameters (host= ' 127.0.0.1 ')) Channel = Connection.channel () channel.exchange_declare (exchange= ' direct_ Logs ', exchange_type= ' direct ') result = Channel.queue_declare (exclusive=true) queue_name = Result.method.queueseverities = sys.argv[1:]  # keyword for severity in severities:    channel.queue_bind (exchange= ' Direct_logs ',                       queue=queue_name,                       routing_key=severity) def callback (ch, method, properties, body):    Print (ch, method, properties)    Print (' Received message from%s:%s '% (Method.routing_key, body)) Channel.basic_consume (callback,                      Queue=queue_name,                      no_ ack=true) print (' Start waiting for message ') channel.start_consuming ()

Open 3 message Subscribers, referring to the keyword info, warning,warning, error,error, info, open a message publisher, reference the keyword wanrning

Only message subscribers that reference the keyword warning receive a message

No message is received without referencing the keyword warning

Topic: Qualifying queue to receive messages

Message Subscribers specify criteria for qualifying queue to be received by message subscribers

#和 * matches one or more arbitrary characters

A single # will match all strings, and a single * cannot match

Message Publishing Side

#-*-Coding:utf-8-*-__author__ = "MuT6 sch01ar" import pikaimport sysconnection = Pika. Blockingconnection (Pika. Connectionparameters (host= ' 127.0.0.1 ')) Channel = Connection.channel () channel.exchange_declare (exchange= ' topic_ Logs ', exchange_type= ' topic ') severity = sys.argv[1] If len (SYS.ARGV) > 1 Else ' info ' message = ' Hello world! ' Channel.basic_publish (exchange= ' topic_logs ',                      routing_key=severity,                      body=message) print (' Send message [%s] ' to [%s] '% (severity, message)) Connection.close ()

Message subscribers

#-*-Coding:utf-8-*-__author__ = "MuT6 sch01ar" import pikaimport sysconnection = Pika. Blockingconnection (Pika. Connectionparameters (host= ' 127.0.0.1 ')) Channel = Connection.channel () channel.exchange_declare (exchange= ' topic_ Logs ', exchange_type= ' topic ') result = Channel.queue_declare (exclusive=true) queue_name = Result.method.queuekeys = Sys.argv[1:]for key in Keys:    channel.queue_bind (exchange= ' topic_logs ',                       queue=queue_name,                       routing_key= Key) def callback (ch, method, properties, body): Print (    ch, method, properties)    print (' from [%s] ' information [%s] '% (method. Routing_key, body)) Channel.basic_consume (callback,                      Queue=queue_name,                      no_ack=true) print (' Start receiving messages ') Channel.start_consuming ()

Open 3 message subscribers and one message publisher

3 message subscribers, one *.exe matches the end of the. exe, one # matches all strings, and one Python.exe matches only the string Python.exe

Message Publishing side reference keyword Qq.exe

Obviously, a message that matches the end of the. exe and matches all the strings will receive a message that matches only the string of Python.exe and does not receive a message

PYTHON-RABBITMQ publication and subscription of Message Queuing