django多任务开启rabbitmq，并进行声明队列、发送、阻塞监听消息

一，编写rabbitmq基础模块类

1,安装pika模块

pip install pika

这里需要注意的是： pika官网明确说明 pika==0.11.0版本只支持python2.6以前的版本。
重点： 在下载时可以进入官网确定你的版本所需要的pika版本号。
pika官网地址：https://pypi.org/project/pika/

2，实现rabbitmq基础模块类的编写

这里实现了Rabbitmq对象初始化、连接mq、发送mq消息、阻塞监听消息并回调。
本模块代码作为rabbitmq基础模块类，为业务模块调用提供方法。
对于代码的详解已经写道注释中了。

这里的一个connection就是一个tcp连接。为了提升tcp连接复用性，在每个连接基础上可以建立多个channel信道，每个信道都会被指派一个唯一的 ID。同时 RabbitMQ 可以确保每个线程的私密性，就像拥有独立的连接一样。但考虑到如果数据量过大，会导致连接阻塞，最终这里选择一个connect连接只对应了一个channel信道。
关于RabbitMQ 中 Connection 和 Channel 详解：https://www.cnblogs.com/eleven24/p/10326718.html
类似于下图：

模块代码如下：

import pika
import time
import logging
logger = logging.getLogger('mydjango')
# import sys
from django.conf import settings
from retrying import retry

class RabbitmqServer(object):
    def __init__(self,username,password,serverip,port,virtual_host):
        self.username =username
        self.password = password
        self.serverip = serverip
        self.port = port
        self.virtual_host = virtual_host

    # def connent(self):
    #    for i in range(3):
    #         try:
    #             logger.info("into mq connet")
    #             user_pwd = pika.PlainCredentials(self.username,self.password)
    #             logger.info("create mq ...")
    #             logger.info("%s,%s,%s,%s,%s"%(self.virtual_host,self.serverip,self.port,self.password,self.username))
    #             s_conn = pika.BlockingConnection(pika.ConnectionParameters(virtual_host=self.virtual_host,host= self.serverip,port=self.port, credentials=user_pwd))  # 创建连接
    #             logger.info('create channel...')
    #             self.channel = s_conn.channel()
    #             logger.info('connect successful')
    #             break
    #         except Exception as e:
    #             logger.info("连接mq失败，沉睡10s再试，共沉睡三次,失败原因:%s",e)
    #             time.sleep(10)

    @retry(stop_max_delay=30000, wait_fixed=5000)
    def connent(self):
        logger.info("into mq connet")
        user_pwd = pika.PlainCredentials(self.username, self.password)
        logger.info("create mq ...")
        logger.info("%s,%s,%s,%s,%s" % (self.virtual_host, self.serverip, self.port, self.password, self.username))
        # 创建 mq连接
        s_conn = pika.BlockingConnection(
            pika.ConnectionParameters(virtual_host=self.virtual_host, host=self.serverip, port=self.port,
                                      credentials=user_pwd))  
        logger.info('create channel...')
        self.channel = s_conn.channel()
        logger.info('connect successful')

    def productMessage(self,queuename,message):
        self.channel.queue_declare(queue=queuename, durable=True)
        self.channel.basic_publish(exchange='',
                              routing_key=queuename,#写明将消息发送给队列queuename
                              body=message,    #要发送的消息
                              properties=pika.BasicProperties(delivery_mode=2,)#设置消息持久化，将要发送的消息的属性标记为2，表示该消息要持久化
                              )

    def expense(self,queuename,func):
        """
        :param queuename: 消息队列名称
        :param func: 要回调的方法名
        """
        self.channel.basic_qos(prefetch_count=1)
        self.channel.basic_consume(
                            func,
                            queue=queuename,
                            )
        self.channel.start_consuming()

def callback(ch, method, properties, body):
    print(" [消费者] Received %r" % body)
    time.sleep(1)
    print(" [消费者] Done")
    ch.basic_ack(delivery_tag=method.delivery_tag)#  接收到消息后会给rabbitmq发送一个确认

if __name__ != '__main__':   # 测试服务是否能启动时使用
    from django.conf import settings
    # username = settings.RABBITMQCONFIG.get("username")
    # password = settings.RABBITMQCONFIG.get("password")
    # severip = settings.RABBITMQCONFIG.get("severip")
    # port = settings.RABBITMQCONFIG.get("port")
    username,password,severip,port,virtual_host = settings.PONEDITOR_RMQ_USER,settings.PONEDITOR_RMQ_PASSWD,settings.PONEDITOR_RMQ_IP,\
                                                  settings.PONEDITOR_RMQ_PORT,settings.PONEDITOR_RMQ_VIRHOST
    RabbitmqClient = RabbitmqServer(username,password,severip,port,virtual_host)

if __name__ == '__main__':
    import json
    RabbitmqClient = RabbitmqServer("root", "ssb@2019",'172.31.0.54',5673,"YuXinIBTool")
    RabbitmqClient.connent()
    data = {"code":3}
    RabbitmqClient.productMessage("test3",json.dumps(data))
    RabbitmqClient.expense("test3",callback)

二，django中多进程开启Rabbitmq声明队列、发送消息、阻塞监听

此模块中将使用多进程，为方便结束开启的多个进程，这里使用kill -15 方法删掉进程。
kill -9 和kill -15的区别：https://www.cnblogs.com/domestique/p/8241219.html

from django.core.management.base import BaseCommand
from utils.echo_display import zip_unzip
import os
import json
import pymysql
import pandas as pd
import time
from django.conf import settings
# from utils.structure_modify import modify
from utils.annual_entrusted_modify import modify_annual
import signal
import multiprocessing
# import threading

class Command(BaseCommand):
    def handle(self, *args, **options):
        import logging
        logger = logging.getLogger('mydjango')
        from utils.Rabbitmqserver import RabbitmqClient
        from django.conf import settings
        import json

        def parse_result_func(ch, method, properties, body):
            ### 逻辑程序
            logger.info("%s start to Analytical data..." %(queue_name))
            logger.info(" [接收到的请求头] Received %r [接收到的请求体] Received %r" % (properties.headers, body))
            try:
                req_res = json.loads(body)
                req_head = dict(properties.headers)
                project_id = str(req_res["projectId"])
                logger.info("Analytical data successful")
            except Exception as e:
                logger.error("there is a failed cause : rabbitmq parameter not correct %s"%(e) )
                logger.error("failed info -- properties : %s  body : %s"%(properties,body))
                return
            try:
                logger.info("start logical")
                finlall_docx_name = modify_annual.main(body)
                logger.info("logical successful")
            except Exception as e:
                logger.error(str(body))
                logger.info("send a reject to rabbitmq queue : %s" % (queue_name))
                # 接收到消息后会给rabbitmq发送一个拒绝
                ch.basic_reject(delivery_tag=method.delivery_tag, requeue=False)  
                logger.info("reject process is end")
            else:
                logger.info("send a ack to rabbitmq queue : %s" % (queue_name))
                # 接收到消息后会给rabbitmq发送一个确认
                ch.basic_ack(delivery_tag=method.delivery_tag)  
		
        def term(sig_num, addtion):
            logger.info("stop the process current pid is %s ,group id is %s" % (os.getpid(), os.getpgrp()))
            os.killpg(os.getpgid(os.getpid()), signal.SIGKILL)

        def func(args):
            arguments = {
                'x-dead-letter-exchange': "exchange.e50.oneditor",  # 延迟结束后指向交换机（死信收容交换机）
                'x-dead-letter-routing-key': "rkey.oneditor5.dlx",  # 延迟结束后指向队列（死信收容队列），可直接设置queue name也可以设置routing-key
            }
            logger.info("into %s sub-process pid is %s ,group id is %s"%(args,os.getpid(), os.getpgrp()))
            global queue_name
            queue_name = args
            logger.info("start to connect the RabbitmqClient")
            # 连接mq，建立connention和channel
            RabbitmqClient.connent()
            # 声明队列
            RabbitmqClient.channel.queue_declare(queue=args, durable=True,arguments=arguments)
            logger.info("connect the RabbitmqClient successful")
            # 调用回调函数并祖泽监听队列
            RabbitmqClient.expense(args, parse_result_func)

        logger.info("into listening logical --queue_listener--")
        # 接受kill -15 消息后，调用term函数
        signal.signal(signal.SIGTERM, term)
        logger.info("current pid is %s ,group id is %s" % (os.getpid(), os.getpgrp()))

		# 开启多进程
        processes_list = []
        listenque_list = ["queue.p"+str(i)+".oneditor.docx" for i in range(10)]
        # listenque_list = ["queue.p0.oneditor.docx"]
        for listenque in listenque_list:
            t = multiprocessing.Process(target=func, args=(listenque,))
            t.daemon = True
            t.start()
            processes_list.append(t)
        for p in processes_list:
            p.join()

###########################################################
        # print("current pid is % s" % os.getpid())
        # processes_list = []
        #
        # listenque_list = ["queue.p1.oneditor.docx","queue.p2.oneditor.docx"]
        # # listenque_list = ["queue.p"+str(i)+".oneditor.docx" for i in range(2)]
        # print(listenque_list)
        # for listenque in listenque_list:
        #     t = multiprocessing.Process(target=func, args=(listenque,))
        #     t.daemon = True
        #     t.start()
        #     processes_list.append(t)
        # time.sleep(2)
        #
        # try:
        #     for p in processes_list:
        #         p.join()
        # except Exception as e:
        #     print(str(e))
##########################################################
        # t1 = threading.Thread(target=func, args=("queue.p1.oneditor.docx",))
        # t2 = threading.Thread(target=func, args=("queue.p2.oneditor.docx",))
        #
        # t1.start()
        # t2.start()

#########################################################
        # class Mythreadsend1(threading.Thread):
        #     def run(self):
        #         logger.info("start to listening the info...")
        #         RabbitmqClient.expense("queue.p1.oneditor.docx", parse_result_func)
        #
        # class Mythreadsend2(threading.Thread):
        #     def run(self):
        #         logger.info("start to listening the info...")
        #         RabbitmqClient.expense("queue.p2.oneditor.docx", parse_result_func)
        #
        # t1 = Mythreadsend1()
        # t2 = Mythreadsend2()
        # t1.start()
        # t2.start()

三，django中使用manage.py开启独立进程

参考如下：https://blog.youkuaiyun.com/luslin1711/article/details/87885145

1、开发时会使用django环境进行一些初始化操作，这些程序一般只执行几次，但是需要django中的环境变量。
2、使用django运行阻塞监听的程序，比如Rabbitmq监听，放在主程序中就阻塞住了，需要另外开命令执行

在创建的app下创建文件夹management，在management文件夹下创建文件夹commands，将要执行的文件放到文件将爱下，记得把__init__.py文件一并创建了，init.py是声明这个文件夹是一个包。然后在主目录（就是manage.py文件所在目录）执行 python manage.py 文件名即可

# 终端前台开启
python manage.py queue_listener

# 终端后台开启
nohup python manage.py queue_listener&

# 终端后台开启，并将打印log放入“黑洞”中
nohup python manage.py queue_listener > /dev/null 2>&1&

# 查看进程pid
ps -aux | grep python