调用多个函数作为 RABBITMQ 消息

Question

I am just starting to use RabbitMQ and Python in general. I have been reading the tuts on the rabbit official page, but I have no idea how to use Rabbitmq to do another things.

I have been trying to run the example of this [tutorial] ( https://www.rabbitmq.com/tutorials/tutorial-three-python.html ), It runs well,.. BUT I need to know how can I create more than one fucntions and call them throug Rabbitmq Messages?... (I am also using this [example] ( Python and RabbitMQ - Best way to listen to consume events from multiple channels? ) to guide me. )

I hope someone have some idea how to do this... (I will repeat again, I am very new on this topics)...

This some code what i have.

I use this code to send the message as the tutorial..

import pika
import sys

url = 'amqp://oamogcgg:xxxxxxxxxxxxxxxxxxxxxxxxx@salamander.rmq.cloudamqp.com/oamogcgg'
params = pika.URLParameters(url)
connection = pika.BlockingConnection(params)
channel = connection.channel()


channel.exchange_declare(exchange='logs', exchange_type='fanout')

message = ' '.join(sys.argv[1:]) or "info: THIS IS A TEST MESSAGE !!!!!!"
channel.basic_publish(exchange='logs', routing_key='', body=message)
print(" [x] Sent %r" % message)
connection.close()

And in this file is where I receive the message according to me.

import pika
import sys
import threading

threads=[]


#function 1 

def validator1(channel):    
channel.queue_declare(queue='queue_name')
print (' [*] Waiting messsaes for valiadtor1 press CTRL+C')


def callback(ch, method, properties, body):
   print (" Received %s" % (body))
   sleep(2) #I need stop it for two minutes

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

#function 2

def validator2(channel):    
channel.queue_declare(queue='queue_name')
print (' [*] Waiting messsaes for valiadtor2 press CTRL+C')


def callback(ch, method, properties, body):
  print (" Received %s" % (body))
  sleep(2) #I need stop it for two minutes

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



def manager():
 url = 'amqp://oamogcgg:xxxxxxxxxxxxxxxxxxxxxxxxx@salamander.rmq.cloudamqp.com/oamogcgg'
 params = pika.URLParameters(url)

#channel 1
 connection1= pika.BlockingConnection(params)
 channel1 = connection1.channel()

 channel1.exchange_declare(exchange='logs', exchange_type='fanout')
 result = channel1.queue_declare(queue='', exclusive=True)
 queue_name = result.method.queue
 channel1.queue_bind(exchange='logs', queue=queue_name)

#channel 2

 connection2= pika.BlockingConnection(params)
 channel2 = connection2.channel()


channel2.exchange_declare(exchange='logs', exchange_type='fanout')
result = channel2.queue_declare(queue='', exclusive=True)
queue_name = result.method.queue
channel2.queue_bind(exchange='logs', queue=queue_name)



#creating threads

t1 = threading.Thread(target=validator1, args=(channel1,))
t1.daemon = True
threads.append(t1)
t1.start()  

t2 = threading.Thread(target=valiadtor2, args=(channel2,))
t2.daemon = True
threads.append(t2)


t2.start()
for t in threads:
    t.join()


manager()

Answer 1

If your functions are dependent(by dependent I mean, one function works on the output of the other) then, you can call all those functions one by one in your callback function. Once the last function is executed successfully you can acknowledge the message.

If those functions are independent then you can maintain multiple queues for each of the function you wanna execute on the message. The same message can be routed to multiple queues using a fanout exchange as mentioned in RabbitMQ Tutorial-3 .