RabbitMQ 入门教程

概述

RabbitMQ 是一个开源的消息代理和队列服务器，实现了 AMQP 0-9-1 标准。它可以在完全不同的应用程序之间传递消息。本教程将带你从零开始学习如何使用 RabbitMQ。

环境准备

1. 安装 RabbitMQ

• 在命令行中运行 sudo apt-get install rabbitmq-server (Ubuntu) 或者通过官方文档获取其他系统的安装指南。

1. 启动服务

• 运行 sudo service rabbitmq-server start。

1. 安装客户端库

• 对于 Python: pip install pika

第一步：发送简单消息

发送端

import pika

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))

channel = connection.channel()

channel.queue_declare(queue='hello')

channel.basic_publish(exchange='',

routing_key='hello',

body='Hello World!')

print(" [x] Sent 'Hello World!'")

connection.close()

接收端

import pika

def callback(ch, method, properties, body):

print(" [x] Received %r" % body)

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))

channel = connection.channel()

channel.queue_declare(queue='hello')

channel.basic_consume(queue='hello',

on_message_callback=callback,

auto_ack=True)

print(' [*] Waiting for messages. To exit press CTRL+C')

channel.start_consuming()

第二步：工作队列

生产者

import pika

import sys

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))

channel = connection.channel()

channel.queue_declare(queue='task_queue', durable=True)

message = ' '.join(sys.argv[1:]) or "Hello World!"

channel.basic_publish(

exchange='',

routing_key='task_queue',

body=message,

properties=pika.BasicProperties(

delivery_mode=2, # make message persistent

))

print(" [x] Sent %r" % message)

connection.close()

消费者

import pika

import time

def callback(ch, method, properties, body):

print(" [x] Received %r" % body)

time.sleep(body.count(b'.'))

print(" [x] Done")

ch.basic_ack(delivery_tag=method.delivery_tag)

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))

channel = connection.channel()

channel.queue_declare(queue='task_queue', durable=True)

print(' [*] Waiting for messages. To exit press CTRL+C')

channel.basic_qos(prefetch_count=1)

channel.basic_consume(queue='task_queue', on_message_callback=callback)

channel.start_consuming()

第三步：发布/订阅

发布端

import pika

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))

channel = connection.channel()

channel.exchange_declare(exchange='logs', exchange_type='fanout')

message = "Info: Hello World!"

channel.basic_publish(exchange='logs', routing_key='', body=message)

print(" [x] Sent %r" % message)

connection.close()

接收端 1

import pika

import uuid

def on_message(channel, method, props, body):

print("[x] %r" % body)

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))

channel = connection.channel()

channel.exchange_declare(exchange='logs', exchange_type='fanout')

result = channel.queue_declare(queue='', exclusive=True)

queue_name = result.method.queue

channel.queue_bind(exchange='logs', queue=queue_name)

print(' [*] Waiting for logs. To exit press CTRL+C')

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

channel.start_consuming()

接收端 2

import pika

import uuid

def on_message(channel, method, props, body):

print("[x] %r" % body)

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))

channel = connection.channel()

channel.exchange_declare(exchange='logs', exchange_type='fanout')

result = channel.queue_declare(queue='', exclusive=True)

queue_name = result.method.queue

channel.queue_bind(exchange='logs', queue=queue_name)

print(' [*] Waiting for logs. To exit press CTRL+C')

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

channel.start_consuming()

第四步：路由模式

发送端

import pika

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))

channel = connection.channel()

channel.exchange_declare(exchange='direct_logs', exchange_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()

接收端

```python

import pika

def callback(ch, method, properties, body):

print(" [x] %r:%r" % (method.routing_key, body))

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))

channel = connection.channel()

channel.exchange_declare(exchange='direct_logs', exchange_type='direct')

result = channel.queue_declare(queue='', exclusive=True)

queue_name = result.method.queue

severities = ['error', 'warning']

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')

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

channel.start_consuming()