python---RabbitMQ（3）exchange中关键字发送direct（组播）

设置关键字，交换机根据消费者传递的关键字判断是否与生产者的一致，一致则将数据传递给消费者

可以实现对消息分组

生产者：

# coding:utf8
# __author:  Administrator
# date:      2018/3/15 0015
# /usr/bin/env python
import pika
import sys

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

channel = connection.channel()

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

key = 'hahaha'
key = sys.argv[1] if len(sys.argv)>1 else 'info'

message = "Hello World"

channel.basic_publish(exchange='direct_logs',
                      routing_key=key,#客户端必须与这个密匙相同才会允许从交换机中取走数据
                      body=message
                      )

print("Send message")

connection.close()

消费者：

# coding:utf8
# __author:  Administrator
# date:      2018/3/15 0015
# /usr/bin/env python
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

key = 'hahaha'
# key=sys.argv[1:]
# if not key:
#     sys.stderr.write('Key: %s is error'%key)
#     sys.exit(1)

channel.queue_bind(exchange='direct_logs',
                   queue=queue_name,
                   routing_key=key)#当消费者和生产者两个的关键字一致，才会接收数据
#注意可以绑定多个关键字，都是以字符串形式　　，如果传递参数是列表形式key = sys.argv[1:]，我们需要循环绑定，就是将所有输入的key都绑定到消费者上

print('Waiting for message')

def callback(ch, method, properties, body):
    print('recv: %s'%ch)

channel.basic_consume(callback,
                      queue=queue_name,
                      no_ack=True)

channel.start_consuming()