Tornado + Celery + RabbitMQ

声明：代码是从项目中截取的， 为进行测试

使用Celery任务队列，Celery 只是一个任务队列，需要一个broker媒介，将耗时的任务传递给Celery任务队列执行，执行完毕将结果通过broker媒介返回。官方推荐使用RabbitMQ作为消息传递，redis也可以

一、Celery 介绍：

注意：

1、当使用RabbitMQ时，需要按照pika第三方库，pika0.10.0存在bug，无法获得回调信息，需要按照0.9.14版本即可

2、tornado-celery 库比较旧，无法适应Celery的最新版，会导致报无法导入task Producter包错误，只需要将celery版本按照在3.0.25就可以了

 

二、配置

单个参数配置：
app.conf.CELERY_RESULT_BACKEND = ‘redis://localhost:6379/0‘ 

多个参数配置：
app.conf.update(
     CELERY_BROKER_URL = ‘amqp://guest@localhost//‘,
     CELERY_RESULT_BACKEND = ‘redis://localhost:6379/0‘
 )

从配置文件中获取：（将配置参数写在文件app.py中）

 BROKER_URL=‘amqp://guest@localhost//‘
 CELERY_RESULT_BACKEND=‘redis://localhost:6379/0‘
 app.config_from_object(‘celeryconfig‘)

三、案例

启动一个Celery 任务队列，也就是消费者：

 from celery import Celery
 celery = Celery(‘tasks‘, broker=‘amqp://guest:guest@119.29.151.45:5672‘, backend=‘amqp‘)  使用RabbitMQ作为载体, 回调也是使用rabbit作为载体

 @celery.task(name=‘doing‘)   #异步任务，需要命一个独一无二的名字
 def doing(s, b):
     print(‘开始任务‘)
     logging.warning(‘开始任务--{}‘.format(s))
     time.sleep(s)
     return s+b

命令行启动任务队列守护进程，当队列中有任务时，自动执行 （命令行可以放在supervisor中管理）

--loglevel=info --concurrency=5

记录等级，默认是concurrency：指定工作进程数量，默认是CPU核心数

启动任务生产者

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import tcelery
from tornado.web import RequestHandler
import tornado

tcelery.setup_nonblocking_producer()  # 设置为非阻塞生产者，否则无法获取回调信息

class MyMainHandler(RequestHandler):
    @tornado.web.asynchronous
    @tornado.gen.coroutine
    def get(self, *args, **kwargs):
        print('begin')
        result = yield tornado.gen.Task(sleep.apply_async, args=[10])  # 使用yield 获取异步返回值，会一直等待但是不阻塞其他请求
        print('ok - -{}'.format(result.result))  # 返回值结果

        # sleep.apply_async((10, ), callback=self.on_success)
        # print(‘ok -- {}‘.format(result.get(timeout=100)))#使用回调的方式获取返回值,发送任务之后，请求结束，所以不能放在处理tornado的请求任务当中，因为请求已经结束了，与客户端已经断开连接，无法再在获取返回值的回调中继续向客户端返回数据

        # result = sleep.delay(10)    #delay方法只是对apply_async方法的封装而已
        # data = result.get(timeout=100)  #使用get方法获取返回值，会导致阻塞，相当于同步执行

        def on_success(self, response):  # 回调函数
            print('Ok - - {}'.format(response))

=======================

#!/usr/bin/env python

# -*-  coding:utf-8 -*-

from tornado.web import Application

from tornado.ioloop import IOLoop

import tcelery

from com.analysis.handlers.data_analysis_handlers import *

from com.analysis.handlers.data_summary_handlers import *

from com.analysis.handlers.data_cid_sumjson_handler import Cid_Sumjson_Handler

from com.analysis.handlers.generator_handlers import GeneratorCsv, GeneratorSpss

Handlers = [

    (r"/single_factor_variance_analysis/(.*)", SingleFactorVarianceAnalysis), # 单因素方差检验

]

if __name__ == "__main__":

    tcelery.setup_nonblocking_producer()

    application = Application(Handlers)

    application.listen(port=8888, address="0.0.0.0")

    IOLoop.instance().start()

server

#!/usr/bin/env python

# -*-  coding:utf-8 -*-

import tornado.gen

import tornado.web

from com.analysis.core.base import BaseAnalysisRequest

from com.analysis.tasks.data_analysis import *

class SingleFactorVarianceAnalysis(BaseAnalysisRequest):

    @tornado.gen.coroutine

    def get(self, *args, **kwargs):

        response = yield self.celery_task(single_factor_variance_analysis.apply_async, params=args)

        print(response.result)

        self.write(response.result[2])

handler

#!/usr/bin/env python

# -*-  coding:utf-8 -*-

from collections import defaultdict

import pandas as pd

import numpy as np

import pygal

import tornado.gen

from pygal.style import LightStyle

from tornado.web import RequestHandler

import json

from com.analysis.db.db_engine import DBEngine

from com.analysis.utils.log import LogCF

from com.analysis.handlers.data_cid_sumjson_handler import cid_sumjson

class BaseRequest(RequestHandler):

    def __init__(self, application, request, **kwargs):

        super(BaseRequest, self).__init__(application, request, **kwargs)

class BaseAnalysisRequest(BaseRequest):

    def __init__(self, application, request, **kwargs):

        super(BaseAnalysisRequest, self).__init__(application, request, **kwargs)

    @tornado.gen.coroutine

    def celery_task(self, func, params, queue="default_analysis"):

        args_list = list(params)

        args_list.insert(0, "")

        response = yield tornado.gen.Task(func, args=args_list, queue=queue)

        raise tornado.gen.Return(response)

basehandler

#!/usr/bin/env python

# -*-  coding:utf-8 -*-

from celery import Celery

from com.analysis.core.chi_square_test import CST

from com.analysis.generator.generator import GeneratorCsv, GeneratorSpss

celery = Celery(

    'com.analysis.tasks.data_analysis',

    broker='amqp://192.168.1.1:5672',

    include='com.analysis.tasks.data_analysis'

)

celery.conf.CELERY_RESULT_BACKEND = "amqp://192.168.1.1:5672"

celery.conf.CELERY_ACCEPT_CONTENT = ['application/json']

celery.conf.CELERY_TASK_SERIALIZER = 'json'

celery.conf.CELERY_RESULT_SERIALIZER = 'json'

celery.conf.BROKER_HEARTBEAT = 30

celery.conf.CELERY_IGNORE_RESULT = False  # this is less important

logger = Logger().getLogger()

@celery.task()

def single_factor_variance_analysis(*args):

    return SFV().do_(*args)

task