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[已解决]Flask中添加后台进程用于提醒到期时发送通知

Flask crifan 1373浏览 0评论

折腾:

[记录]基于Flask给微信公众号添加到期提醒通知

期间,需要去研究,Flask中,如何去添加后台的进程,用于时间到期后,发送通知。

所以先去:

[已解决]Flask中实现后台任务选择什么库

最后决定用:

Flask-RQ2

注:RQ==Redis Queue

基本用法,看官网貌似即可:

jezdez/Flask-RQ2: A Flask extension for RQ.

Flask-RQ2 — Flask-RQ2 16.0.2 documentation

但是还是要去搞清楚:

如何安装redis,配置redis

搜:

Flask-RQ 安装redis

使用 Python RQ 的 Python 执行后台任务 – 技术翻译 – 开源中国社区

基于redis又比celery更加简单的异步任务队列RQ | 峰云就她了

-》好像是redis用yum install redis即可。

python redis

python redis Flask-RQ

python redis Flask

Flask-Redis 0.3.0 : Python Package Index

underyx/flask-redis: A Flask extension for using Redis

pip安装flask-redis后,如何启动redis-server服务? 短知乎

pip install redis是个python的redis库,并不是redis本身。redis安装看这个 Download – Redis

flask+pypy+setuptools+redis+MySQLdb安装 – longxibendi的专栏 – 博客频道 – CSDN.NET

Flask+Nginx+Gunicorn+Redis+Mysql搭建一个小站 | Alex’s Blog

编写配置文件gunicorn.conf
workers = 4
bind = ‘192.168.60.146:8888’
proc_name = ‘app’
pidfile = ‘/tmp/app.pid’
执行:
gunicorn –config gunicorn.conf app:app

使用 flask-cache 时为什么不会使用全局 redis – V2EX

好像是:

需要先安装redis服务:

Redis

然后再安装flask-redis

再去安装flask-rq2

去安装

Flask 安装redis

[已解决]为Flask的后台任务而在CentOS中安装Redis

然后再去安装flask-redis

(SIPEvents) ➜  SIPEvents pip install flask-redis
Collecting flask-redis
  Downloading Flask_Redis-0.3.0-py2.py3-none-any.whl
Requirement already satisfied (use –upgrade to upgrade): Flask>=0.8 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from flask-redis)
Collecting redis>=2.7.6 (from flask-redis)
  Downloading redis-2.10.5-py2.py3-none-any.whl (60kB)
    100% |████████████████████████████████| 61kB 22kB/s 
Requirement already satisfied (use –upgrade to upgrade): itsdangerous>=0.21 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from Flask>=0.8->flask-redis)
Requirement already satisfied (use –upgrade to upgrade): Jinja2>=2.4 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from Flask>=0.8->flask-redis)
Requirement already satisfied (use –upgrade to upgrade): Werkzeug>=0.7 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from Flask>=0.8->flask-redis)
Requirement already satisfied (use –upgrade to upgrade): click>=2.0 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from Flask>=0.8->flask-redis)
Requirement already satisfied (use –upgrade to upgrade): MarkupSafe in /root/Envs/SIPEvents/lib/python2.7/site-packages (from Jinja2>=2.4->Flask>=0.8->flask-redis)
Installing collected packages: redis, flask-redis
Successfully installed flask-redis-0.3.0 redis-2.10.5

再去安装flask-rq2

(SIPEvents) ➜  SIPEvents pip install flask-rq2
Collecting flask-rq2
  Downloading Flask_RQ2-16.0.2-py2.py3-none-any.whl
Collecting rq-scheduler>=0.6.1 (from flask-rq2)
  Downloading rq_scheduler-0.7.0-py2.py3-none-any.whl
Requirement already satisfied (use –upgrade to upgrade): Flask>=0.10 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from flask-rq2)
Collecting rq>=0.6.0 (from flask-rq2)
  Downloading rq-0.6.0-py2.py3-none-any.whl (48kB)
    100% |████████████████████████████████| 51kB 79kB/s 
Collecting croniter>=0.3.9 (from rq-scheduler>=0.6.1->flask-rq2)
  Downloading croniter-0.3.12.tar.gz
Requirement already satisfied (use –upgrade to upgrade): itsdangerous>=0.21 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from Flask>=0.10->flask-rq2)
Requirement already satisfied (use –upgrade to upgrade): Jinja2>=2.4 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from Flask>=0.10->flask-rq2)
Requirement already satisfied (use –upgrade to upgrade): Werkzeug>=0.7 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from Flask>=0.10->flask-rq2)
Requirement already satisfied (use –upgrade to upgrade): click>=2.0 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from Flask>=0.10->flask-rq2)
Requirement already satisfied (use –upgrade to upgrade): redis>=2.7.0 in /root/Envs/SIPEvents/lib/python2.7/site-packages (from rq>=0.6.0->flask-rq2)
Collecting python-dateutil (from croniter>=0.3.9->rq-scheduler>=0.6.1->flask-rq2)
  Downloading python_dateutil-2.5.3-py2.py3-none-any.whl (201kB)
    100% |████████████████████████████████| 204kB 38kB/s 
Requirement already satisfied (use –upgrade to upgrade): setuptools in /root/Envs/SIPEvents/lib/python2.7/site-packages (from croniter>=0.3.9->rq-scheduler>=0.6.1->flask-rq2)
Requirement already satisfied (use –upgrade to upgrade): MarkupSafe in /root/Envs/SIPEvents/lib/python2.7/site-packages (from Jinja2>=2.4->Flask>=0.10->flask-rq2)
Requirement already satisfied (use –upgrade to upgrade): six>=1.5 in /root/Envs/SIPEvents/lib/python2.7/site-packages/six-1.10.0-py2.7.egg (from python-dateutil->croniter>=0.3.9->rq-scheduler>=0.6.1->flask-rq2)
Building wheels for collected packages: croniter
  Running setup.py bdist_wheel for croniter … done
  Stored in directory: /root/.cache/pip/wheels/c2/c0/db/3991f61b3a5e5c019d3f81ca556d095b1618bf8166368caf1d
Successfully built croniter
Installing collected packages: python-dateutil, croniter, rq, rq-scheduler, flask-rq2
Successfully installed croniter-0.3.12 flask-rq2-16.0.2 python-dateutil-2.5.3 rq-0.6.0 rq-scheduler-0.7.0

然后继续参考官网:

jezdez/Flask-RQ2: A Flask extension for RQ.

API — Flask-RQ2 16.0.2 documentation

结果出错:

[已解决]用Flask-RQ2运行后台任务失败:ConnectionError Error 97 connecting to localhost 6379

然后:

[已解决]Flask-RQ2+redis的后台进程不工作

然后接着就是具体如何使用Flask-RQ2,rq worker和rqscheduler的事情了:

[记录]Flask中给活动到期添加提醒功能

[总结]

此处,Flask中添加后台任务,没有去用最著名的Celery,因为太重,不够轻量级。

而选择了比较简单,性能不差的RQ==Redis Queue

“rq是python的一个用redis做的队列,简单实用。”

而redis和RQ直接在Python的Flask中用起来,也还是有点点麻烦的。

所以有人又去封装了Flask中的redis和RQ,并且还有很多个封装。

最后选择了:

Flask-Redis

Flask-RQ2

具体的步骤是:

在虚拟环境中

1.用pip安装flask-redis和flask-rq2:

pip install flask-redis
pip install flask-rq2

会自动安装所依赖的库:

installed flask-redis-0.3.0 redis-2.10.5

installed croniter-0.3.12 flask-rq2-16.0.2 python-dateutil-2.5.3 rq-0.6.0 rq-scheduler-0.7.0

2.安装redis

而对于:

Flask-Redis只是个粘合剂,只是个接口的封装,并没有安装真正的Redis,所以还要再去安装redis:

步骤如下:

wget http://download.redis.io/redis-stable.tar.gz
tar xvzf redis-stable.tar.gz
cd redis-stable
make
yum install -y tcl
make test
make install
mkdir /etc/redis
cp redis.conf /etc/redis
redis-server /etc/redis/redis.conf

详见过程见:

[已解决]为Flask的后台任务而在CentOS中安装Redis

转载请注明:在路上 » [已解决]Flask中添加后台进程用于提醒到期时发送通知

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