原文链接：http://wyb0.com/posts/python-module-mrq/
部分参考了大表哥的代码
0x00 MRQ
- MRQ是Python基于Redis、Mongo和gevent的分布式任务队列。
- MRQ一方面旨在像RQ一样简单，另一方面有接近Celery的性能。
- MRQ最初的功能设计是为了满足任务队列的各种任务需求(IO密集&CPU密集，很多小任务&几个大任务)。
0x01 设置mongo和redis
因为mrq依赖于redis和mongo，所以先安装设置下
- 安装redis
$ sudo apt-get install redis-server
$ netstat -nlt|grep 6379
$ sudo /etc/init.d/redis-server status
$ sudo /etc/init.d/redis-server stop
$ sudo vim /etc/redis/redis.conf
#bind 127.0.0.1
requirepass reber_redis
$ sudo redis-server /etc/redis/redis.conf &
$ redis-cli
> auth reber_redis
$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 0C49F3730359A14518585931BC711F9BA15703C6
$ echo "deb [ arch=amd64 ] http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.4.list
$ sudo apt-get update
$ sudo apt-get install -y mongodb-org
$ ps -aux|grep mongodb
$ netstat -nlt|grep 27017
$ mongo
> use admin
switched to db admin
> db.createUser({user:'root',pwd:'root',roles:[{role:'root',db:'admin'}]})
Successfully added user: {
"user" : "root",
"roles" : [
{
"role" : "root",
"db" : "admin"
}
]
}
> db.auth('root','root')
1
> use mrq
switched to db mrq
> db.createUser({user:'reber_mrq_u',pwd:'reber_mrq_p',roles:[{role:'dbOwner',db:'mrq'}]})
Successfully added user: {
"user" : "reber_mrq_u",
"roles" : [
{
"role" : "dbOwner",
"db" : "mrq"
}
]
}
> db.auth('reber_mrq_u','reber_mrq_p')
> db.shutdownServer()
$ sudo vim /etc/mongod.conf
storage:
dbPath: /var/lib/mongodb
journal:
enabled: true
systemLog:
destination: file
logAppend: true
path: /var/log/mongodb/mongod.log
net:
port: 27017
#bindIp: 127.0.0.1
security:
authorization: enabled
$ sudo mongod --config /etc/mongod.conf &
$ mongo
MongoDB shell version v3.4.6
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.6
> use mrq
switched to db mrq
> db.auth('reber_mrq_u','reber_mrq_p')
1
0x02 案例代码
$ mkdir mrqtest && cd mrqtest
$ touch __init__.py
$ touch scheduler.py
$ touch tasks_push.py
$ touch dotask.py
$ touch worker.sh && chmod 777 worker.sh
- scheduler.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""定期推送执行任务"""
import time
import random
class Scheduler(object):
"""docstring for Scheduler"""
def __init__(self, interval, mongodb_uri, redis_uri):
super(Scheduler, self).__init__()
self.interval = interval
self.mongodb_uri = mongodb_uri
self.redis_uri = redis_uri
def exec_push_work(self):
import subprocess
for task in ['task1', 'task2']:
data = random.randint(1000, 9999)
command = "mrq-run --queue {task} tasks_push.{task} '{data}' \
--default_job_max_retries=3 --mongodb={mongodb_uri} \
--redis={redis_uri}".format(task=task, data=data,
mongodb_uri=self.mongodb_uri, redis_uri=self.redis_uri)
subprocess.Popen(command, shell=True,stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
def run(self):
while True:
self.exec_push_work()
# 每隔20秒推送一次任务
time.sleep(self.interval)
if __name__ == '__main__':
interval = 20
mongodb_uri = 'mongodb://reber_mrq_u:reber_mrq_p@127.0.0.1:27017/mrq'
redis_uri = 'redis://reber_redis@127.0.0.1:6379/0'
scheduler = Scheduler(interval,mongodb_uri,redis_uri)
scheduler.run()
- tasks_push.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""执行任务时调用的就是这个文件中类中的run函数"""
from mrq.task import Task
from dotask import do_task1,do_task2
class task1(Task):
def run(self, params):
result = do_task1(params)
return result
class task2(Task):
def run(self, params):
result = do_task2(params)
return result
- dotask.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""执行任务的具体函数"""
def do_task1(params):
return "task1:{}".format(params)
def do_task2(params):
return "task2:{}".format(params)
- worker.sh
#!/bin/bash
mrq-worker task1 --greenlets 5 --mongodb mongodb://reber_mrq_u:reber_mrq_p@127.0.0.1:27017/mrq --redis redis://reber_redis@127.0.0.1:6379/0 &
mrq-worker task2 --greenlets 5 --mongodb mongodb://reber_mrq_u:reber_mrq_p@127.0.0.1:27017/mrq --redis redis://reber_redis@127.0.0.1:6379/0 &
0x03 修改MRQ库的代码
#mrq中坑爹的数据库链接，当指定密码连接redis时一直提示没有权限😂，
#原因是mrp/context.py中格式化redis的连接参数时使用的是import urllib.parse，
#它是urlparse库的改进版，是Python3.0中的，但是我本地是Python2.7的，没有urllib.parse
#修改/Library/Python/2.7/site-packages/mrq/context.py，自己添加个函数解析下：
def redis_parse_uri(uri):
SCHEME = 'redis://'
SCHEME_LEN = len(SCHEME)
DEFAULT_PORT = 6379
host = None
port = None
path = None
password = None
scheme_free = uri[SCHEME_LEN:]
idx = scheme_free.rfind('/')
if idx == -1:
host_part = scheme_free
else:
path = scheme_free[idx:]
host_part = scheme_free[:idx]
idx = host_part.find('@')
if idx == -1:
hosts = host_part
else:
password = host_part[:idx]
hosts = host_part[idx+1:]
idx = hosts.find(':')
if idx == -1:
host = hosts
port = DEFAULT_PORT
else:
host = hosts.split(':')[0]
port = int(hosts.split(':')[1])
return {
'host': host,
'port': port,
'path': path,
'password': password
}
def _connections_factory(attr):
"""找到这里改下"""
# urllib.parse.uses_netloc.append('redis')
# redis_url = urllib.parse.urlparse(config_obj)
redis_url = redis_parse_uri(config_obj)
log.info("%s: Connecting to Redis at %s..." %
(attr, redis_url.get('host')))
redis_pool = pyredis.BlockingConnectionPool(
host=redis_url.get('host'),
port=redis_url.get('port'),
db=int((redis_url.get('path') or "").replace("/", "") or "0"),
password=redis_url.get('password'),
max_connections=int(config.get("redis_max_connections")),
timeout=int(config.get("redis_timeout")),
decode_responses=True
)
0x04 执行
-
清空数据库
清空数据库 启动mrq-dashboard
$ mrq-dashboard --mongodb mongodb://reber_mrq_u:reber_mrq_p@127.0.0.1:27017/mrq --redis redis://reber_redis@127.0.0.1:6379/0
#--mongodb和--redis均以uri格式指定连接数据库的信息
#执行完访问 http://127.0.0.1:5555 即可
启动mrq-dashboard
- 执行workers.sh
$ cd mrqtest
$ ./worker.sh
#这里会创建两个worker，名字为task1和task2
启动mrq-dashboard后查看dashboad
未添加任务时jobs为空
- 执行scheduler.py从而推送任务
$ cd mrqtest
$ python scheduler.py
添加任务
添加任务后查看jobs
