死信链接配置
import pika,json,time
credentials = pika.PlainCredentials('root', 'xxxx') # mq用户名和密码
# 虚拟队列需要指定参数 virtual_host,如果是默认的可以不填。
connection = pika.BlockingConnection(pika.ConnectionParameters(host='xxxxxx', port=5672, virtual_host='/',credentials=credentials))
channel = connection.channel()
# 声明消息队列,消息将在这个队列传递,如不存在,则创建
queue_name = "delay_queue_a"
exchange = 'delay_exchange_a'
routing_key = 'delay_routing_key_a'
dead_letter_exchange = 'dead_exchange_a' # 'amq.direct'#'dead_exchange_a'
dead_letter_routing_key = 'dead_letter_routing_key_a' # 'dead_queue_a'#'dead_letter_routing_key_a'
arguments = {
"x-message-ttl": 5000,
'x-dead-letter-exchange': dead_letter_exchange,
'x-dead-letter-routing-key': dead_letter_routing_key
}
channel.confirm_delivery()
channel.exchange_declare(exchange=exchange, durable=True, exchange_type='direct')
result = channel.queue_declare(queue=queue_name, durable=False, arguments=arguments)
channel.queue_bind(exchange=exchange, queue=queue_name, routing_key=routing_key)
for i in range(10):
message = json.dumps({'OrderId': i})
# 向队列插入数值 routing_key是队列名
channel.basic_publish(exchange=exchange, routing_key=routing_key, body=message,
properties=pika.BasicProperties(delivery_mode=2))
print(message)
time.sleep(1.5)
connection.close()
消费者建立,消费死信队列
import pika
import json
credentials = pika.PlainCredentials('root', 'xxxx')
connection = pika.BlockingConnection(pika.ConnectionParameters(host='xxxxx', port=5672, credentials=credentials))
channel = connection.channel()
# 申明消息队列,消息在这个队列传递,如果不存在,则创建队列
queue_name = "dead_queue_a"
# dead_letter_exchange = 'amq.direct'#'dead_exchange_a'
dead_letter_exchange = 'dead_exchange_a'
dead_letter_routing_key = 'dead_letter_routing_key_a'
# queue_name = dead_letter_routing_key
channel.exchange_declare(exchange=dead_letter_exchange, durable=False, exchange_type='direct')
result = channel.queue_declare(queue=queue_name, durable=False)
channel.queue_bind(exchange=dead_letter_exchange, queue=queue_name, routing_key=dead_letter_routing_key)
# 定义一个回调函数来处理消息队列中的消息,这里是打印出来
def callback(ch, method, properties, body):
data = json.loads(body.decode())
print(data)
ch.basic_ack(delivery_tag=method.delivery_tag)
# 告诉rabbitmq,用callback来接收消息
channel.basic_consume(queue_name, callback,
auto_ack=False)
print('开始监听')
try:
channel.start_consuming()
except KeyboardInterrupt:
channel.stop_consuming()
connection.close()
print('close')
链接忘记在哪儿了,把自己的放上来