python-rabbitmq

简单producer:

import pika

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

#declar
channel.queue_declare(queue='hello')  #声明一个queue


channel.basic_publish(exchange='',
                      routing_key='hello',   #routing_key就是声明的queue的名字
                      body='Hello World!')   #消息内容
print("[x] Send 'hello World!'")
connection.close()

 简单consumer:

import pika
import time

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

'''
#如果确认这个queue已经存在， 可以不写下面语句，但是这里不声明，如果消费者先执行，就会出错。
'''
channel.queue_declare(queue='hello')

def callback(ch,method,properties,body):
     '''
     :param ch: 管道的内存对象
     :param method:
     :param properties:
     :param body: 消息内容
     :return:
     '''
     print('---->',ch,method,properties,body)
     time.sleep(30)   
     print("[x] Recevied %r" % body)



channel.basic_consume(callback,  #如果收到消息，就调用callback函数来处理消息
                      queue='hello', #从哪个队列收消息，收到消息执行callback
                      #no_ack=True   #True代表不确认,无论callback消息处理失败还是完成，都不会和生产端确认,默认是Flase，代表确认
                      )
print('[*] Waiting for messages.To exit press CTRL+C')
channel.start_consuming()  #start 执行命令

队列以及消息持久化：

#producer

import pika

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

#declar
channel.queue_declare(queue='hello3',durable=True)  #声明一个queue,durable参数设定持久化,注意持久化的只是队列，而不是消息内容

channel.basic_publish(
                      exchange='',
                      routing_key='hello3',  #routing_key就是声明的queue的名字
                      body='Hello World!', #消息内容
                      properties=pika.BasicProperties(delivery_mode=2)   #消息持久化参数
                      )
print("[x] Send 'hello World!'")
connection.close()



#consumer

import pika
import time

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

'''
#如果确认这个queue已经存在， 可以不写下面语句，但是这里不声明，如果消费者先执行，就会出错。
'''
channel.queue_declare(queue='hello3',durable=True) #durable参数要与生产端保持一致
#channel.queue_declare(queue='hello2')
def callback(ch,method,properties,body):
     '''
     :param ch: 管道的内存对象
     :param method:
     :param properties:
     :param body: 消息内容
     :return:
     '''
     print('---->',ch,method,properties,body)
     time.sleep(5)
     print("[x] Recevied %r" % body)
     ch.basic_ack(delivery_tag=method.delivery_tag)  #配合no_ack参数，处理完成，返回生产端确认


channel.basic_qos(prefetch_count=1) #表示处理完一条再给我发消息
channel.basic_consume(callback,  #如果收到消息，就调用callback函数来处理消息
                      queue='hello3', #从哪个队列收消息，收到消息执行callback
                      #no_ack=True   #True代表不确认,无论callback消息处理失败还是完成，都不会和生产端确认,默认是Flase，代表确认
                      )
print('[*] Waiting for messages.To exit press CTRL+C')
channel.start_consuming()  #start 执行命令

rabbitMQ广播之：fanout （订阅发布）

#producer:

import pika
import sys

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

channel.exchange_declare(exchange='logs',
                         type='fanout')  #fanout表示广播

#message = ' '.join(sys.argv[1:]) or "info: Hello World!"
message = "info: Hello World!"
channel.basic_publish(exchange='logs',
                      routing_key='',
                      body=message)
print("[x] Sent %r" % message)
connection.close()


#consumer:

import pika

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

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

result = channel.queue_declare(exclusive=True)   #exclusive排他的，唯一的，随机分配一个唯一的名字,消费者断开后自动删除
queue_name = result.method.queue

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

print('[x] 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()

广播之direct:

#producer

#!/usr/bin/python3
import pika
import sys

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

channel.exchange_declare('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()


#consumer

#!/usr/bin/python3
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]
" % 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()

topic消息过滤广播：

#producer

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()

#consumer

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]...
" % 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()

rpc：

#sev:

import pika
import time
connection = pika.BlockingConnection(pika.ConnectionParameters(
     host='localhost'))
channel = connection.channel()
channel.queue_declare(queue='rpc_queue')

def fib(n):
     if n == 0:
          return 0
     elif n == 1:
          return 1
     else:
          return fib(n - 1) + fib(n - 2)


def on_request(ch, method, props, body):
     n = int(body)
     print(" [.] fib(%s)" % n)
     response = fib(n)
     ch.basic_publish(exchange='',
                      routing_key=props.reply_to,
                      properties=pika.BasicProperties(correlation_id= props.correlation_id),
                      body=str(response))
     ch.basic_ack(delivery_tag=method.delivery_tag)   #返回对端确认处理完成


#channel.basic_qos(prefetch_count=1)  #此参数设定了处理消息的最大数量
channel.basic_consume(on_request,    #回调函数
                      queue='rpc_queue')    #指定队列
print(" [x] Awaiting RPC requests")
channel.start_consuming()



#cli:

import pika
import uuid
import time


class FibonacciRpcClient(object):
     def __init__(self):
          self.connection = pika.BlockingConnection(pika.ConnectionParameters(
               host='localhost'))
          self.channel = self.connection.channel()
          result = self.channel.queue_declare(exclusive=True)
          self.callback_queue = result.method.queue
          self.channel.basic_consume(self.on_response,
                                     no_ack=True,
                                     queue=self.callback_queue)

     def on_response(self, ch, method, props, body):
          if self.corr_id == props.correlation_id: #当接收到对端返回时先判断correlation_id是否与返回的id相同，
                                                  # 确保队列的一致性和唯一性
               self.response = body

     def call(self, n):
          self.response = None
          self.corr_id = str(uuid.uuid4())   #产生一个随机数，赋给correlation_id传给对端,对端返回时再把这个随机数返回
          self.channel.basic_publish(exchange='',
                                     routing_key='rpc_queue',
                                     properties=pika.BasicProperties(
                                          reply_to=self.callback_queue,
                                          correlation_id=self.corr_id,
                                     ),
                                     body=str(n))
          while self.response is None:
               self.connection.process_data_events() #非阻塞版的start_consumer()
               #print("no msg...")
               #time.sleep(0.5)
          return int(self.response)


fibonacci_rpc = FibonacciRpcClient()
print(" [x] Requesting fib(30)")
while True:
     num = input("input>:").strip()
     if num.isdigit() and int(num) > 0:
          response = fibonacci_rpc.call(str(num))
          print(" [.] Got %r" % response)
     else:
          print("请输入大于0的整数")