Python 訊息佇列rabbitmq使用之 更加細緻的 有選擇的 釋出訊息/接收訊息
阿新 • • 發佈:2018-12-10
1、釋出端程式碼
# new_topic_p.py
import pika
import sys
connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
channel = connection.channel()
# 指定使用頭交換機
channel.exchange_declare(exchange='topic_logs',exchange_type='topic')
# 獲取執行指令碼時的輸入
routing_key = sys.argv[1] if len(sys.argv) > 2 else 'anonymous.info'
# 獲取要傳入型別的訊息
message = ' '.join(sys.argv[2:]) or 'Hello World!'
# 釋出訊息
channel.basic_publish(exchange='topic_logs',
routing_key=routing_key,
body=message)
print(" [x] Sent %r:%r" % (routing_key, message))
connection.close()
2、消費端程式碼
# new_topic_c.py
import pika
import sys
connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
channel = connection.channel()
channel.exchange_declare(exchange='topic_logs',exchange_type='topic')
result = channel.queue_declare(exclusive=True)
queue_name = result.method.queue
# 獲取要繫結的key
binding_keys = sys.argv[1:]
if not binding_keys:
sys.stderr.write("Usage: %s [binding_key]...\n" % sys.argv[0])
sys.exit(1)
# 迴圈繫結key,可以繫結多個
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()
3、如何執行 消費端: 執行下邊命令 接收所有日誌:
python new_topic_c.py "#"
執行下邊命令 接收來自”kern“裝置的日誌:
python new_topic_c.py "kern.*"
執行下邊命令 只接收嚴重程度為”critical“的日誌:
python new_topic_c.py "*.critical"
執行下邊命令 建立多個繫結:
python new_topic_c.py "kern.*" "*.critical"
釋出端:
python new_topic_p.py "kern.critical" "A critical kernel error"