0
4

Delete article

Deleted articles cannot be recovered.

Draft of this article would be also deleted.

Are you sure you want to delete this article?

More than 3 years have passed since last update.

Flaskでバックグラウンド実行

Last updated at Posted at 2021-09-17

PythonでThreadを使うflaskサンプルを作ってみた - Qiita
の練習とブラウザで操作できるようにstart,stopボタンをつけてみた。

uwsgiなどで並列プロセス化するとjobs変数共有できないので、別途ジョブキューのceleryなどを使ったプロセス作る必要がある。

app.py
from datetime import datetime
from flask import Flask, make_response
from time import sleep
import threading

app = Flask(__name__)


class MyThread(threading.Thread):
    def __init__(self):
        super(MyThread, self).__init__()
        self.stop_event = threading.Event()

    def stop(self):
        self.stop_event.set()

    def run(self):
        try:
            for _ in range(1000):
                print(f'{datetime.now():%H:%M:%S}')
                sleep(1)

                # 定期的にフラグを確認して停止させる
                if self.stop_event.is_set():
                    break
        finally:
            print('時間のかかる処理が終わりました\n')


@app.route('/')
def index():
    html = """

<!DOCTYPE html>
<html>

<button type="button" id="start">start</button>
<button type="button" id="stop">stop</button>

<script type="text/javascript">
document.getElementById('start').addEventListener('click',function(){
  fetch("/start/1");
},false);
document.getElementById('stop').addEventListener('click',function(){
  fetch("/stop/1");
},false);
</script>

</html>
"""
    return html


jobs = {}


@app.route('/start/<id>/')
def start(id):
    if id in jobs:
        return make_response(f'{id}は実行中です\n'), 200
    t = MyThread()
    t.start()
    jobs[id] = t
    return make_response(f'{id}の処理を受け付けました\n'), 202


@app.route('/stop/<id>/')
def stop(id):
    jobs[id].stop()
    del jobs[id]
    return make_response(f'{id}の中止処理を受け付けました\n'), 202


@app.route('/status/<id>/')
def status(id):
    if id in jobs:
        return make_response(f'{id}は実行中です\n'), 200
    else:
        return make_response(f'{id}は実行していません\n'), 200

【脱jQuery】JavaScriptをネイティブで書くときのあれこれTips | Will Style Inc.|神戸にあるウェブ制作会社
jQueryを使わない書き方 ajax, each, trigger, on/off, extend, deferred, animate, css編 | maesblog
flask run と uWSGI prefork
python - Flaskが応答を返した後に関数を実行する

Celery Background Tasks — Flask Documentation (2.0.x)

miguelgrinberg/flask-celery-example: This repository contains the example code for my blog article Using Celery with Flask.
celery/examples at master · celery/celery

0
4
0

Register as a new user and use Qiita more conveniently

  1. You get articles that match your needs
  2. You can efficiently read back useful information
  3. You can use dark theme
What you can do with signing up
0
4

Delete article

Deleted articles cannot be recovered.

Draft of this article would be also deleted.

Are you sure you want to delete this article?