python 怎样从rabbitmq订阅消息
#coding=utf-8
import pika,sys
from pika import spec
#在"/"虚拟主机vhost上通过用户guest建立channel通道
user_name = 'guest'
user_passwd = 'guest'
target_host = 'localhost'
vhost = '/'
cred = pika.PlainCredentials(user_name,user_passwd)
conn_params = pika.ConnectionParameters(target_host,
virtual_host = vhost,
credentials = cred)
conn_broker = pika.BlockingConnection(conn_params)
channel = conn_broker.channel()
#定义消息发布后publisher接受到的确认信息处理函数
def confirm_handler(frame):
if type(frame.method) == spec.Confirm.SelectOk:
"""生产者创建的channel处于‘publisher comfirms’模式"""
print 'Channel in "confirm" mode!'
elif type(frame.method) == spec.Basic.Nack:
"""生产者接受到消息发送失败并且消息丢失的消息"""
print 'Message lost!'
elif type(frame.method) == spec.Basic.ack:
if frame.method.delivery_tag in msg_ids:
"""生产者接受到成功发布的消息"""
print 'Confirm received!'
msg_ids.remove(frame.method.delivery_tag)
#将生产者创建的channel处于"publisher confirms"模式
channel.confirm_delivery(callback = confirm_handler)
#创建一个direct类型的、持久化的、没有consumer时队列是否自动删除的exchage交换机
channel.exchange_declare(exchange = 'hello-exch',
type = 'direct',
passive = False,
durable = True,
auto_delete = False)
#使用接收到的信息创建消息
#使用接收到的信息创建消息
msg = sys.argv[1]
msg_props = pika.BasicProperties()
msg_props.content_type = 'text/plain'
#持久化消息
msg_props.delivery_mode = 2
msg_ids = []
print 'ready to publish...'
#发布消息
channel.basic_publish(body = msg,
exchange = 'hello-exch',
properties = msg_props,
routing_key = 'hala')
print 'published!'
msg_ids.append(len(msg_ids) + 1)
print len(msg_ids)
channel.close()
conn_broker.close()
