RabbitMQ--Publish/Subscribe（五）
上篇文章中，我们实现了不同consumer接收不同级别的日志，这篇文章中，不以日志级别，使用不同日志来源。比如kernel.*、*.critical。这就要使用topic exchange完成了。将message发送给topic exchange不能包含任意的routing_key了，必须是以'.'分割的多个words。words可以是任何字符。
用到正则如下：
[*]* 代替一个word
[*]# 代替0个或1个words
sender_topic.py
#!/usr/bin/env python
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 if len(sys.argv) > 2 else 'anonymous.info'
message = ' '.join(sys.argv) or 'Hello World!'
channel.basic_publish(exchange='topic_logs',
routing_key=routing_key,
body=message)
print(" Sent %r:%r" % (routing_key, message))
connection.close()
recv_topic.py
#!/usr/bin/env python
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
if not binding_keys:
sys.stderr.write("Usage: %s ...\n" % sys.argv)
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(" %r:%r" % (method.routing_key, body))
channel.basic_consume(callback,
queue=queue_name,
no_ack=True)
channel.start_consuming()
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