[英]Start and Stop thread inside Flask
I am wondering is there something special I need to do for ending a thread job in Flask?我想知道在 Flask 中结束线程作业需要做些什么特别的事情吗? Here is the sample code:
这是示例代码:
from flask import (
Flask, jsonify, render_template, request
)
import threading
import time
import random
app = Flask(__name__)
def task(thread_return):
random_seconds=random.random()
print(f'Start task {threading.current_thread().name} ')
time.sleep(random_seconds*15)
print(f'completed {threading.current_thread().name} ')
thread_return['seconds']= random_seconds*5
thread_return = {'seconds': 0}
@app.route("/", methods=["GET", "POST"])
def index():
if request.method == "GET":
return render_template("index-ajax.html")
val = request.json.get("c_check")
t =threading.Thread(target=task, args=(thread_return,), daemon=True)
if val==1:
print("val1 is ", val)
t.start()
elif val==0:
try:
print('trying to kill thread')
exit_event= threading.Event()
exit_event.set()
except Exception as e:
print(e)
print("val0 is ", val)
return jsonify({"data": {"val": val}})
if __name__ == "__main__":
app.run(host="127.0.0.1", port=5000, debug=True)
I've tried incorporating several examples I saw online that wraps the task function inside a class, but it didn't work, namely: Exit Thread Gracefully我尝试合并我在网上看到的几个示例,这些示例将任务 function 包装在 class 中,但它没有用,即: 优雅地退出线程
I like this other example, but I also couldn't get it to work with Flask: How Do You Kill a Python Thread我喜欢另一个例子,但我也无法让它与 Flask 一起工作:你如何杀死 Python 线程
Thank you for your help.谢谢您的帮助。
I was trying multiple rewrites and noticed that the following works.我正在尝试多次重写,并注意到以下工作。 Apparently, I needed to
显然,我需要
Perhaps someone else have a more elegant pythonic solution.也许其他人有一个更优雅的 pythonic 解决方案。
from flask import (
Flask, jsonify, render_template, request
)
import threading
import time
import random
app = Flask(__name__)
def task(thread_return):
i=0
while True:
if exit_event.is_set():
print(f'end {threading.current_thread().name} ')
return
i+=1
random_seconds=random.random()
print(f'Running task {threading.current_thread().name} {i} sec elapsed')
time.sleep(1)
exit_event= threading.Event()
@app.route("/", methods=["GET", "POST"])
def index():
if request.method == "GET":
return render_template("index-ajax.html")
val = request.json.get("c_check")
exit_event.clear()
t =threading.Thread(target=task, args=(thread_return,), daemon=True)
if val==1:
print("val1 is ", val)
t.start()
elif val==0:
try:
print('trying to end thread')
exit_event.set()
except Exception as e:
print(e)
print("val0 is ", val)
return jsonify({"data": {"val": val}})
if __name__ == "__main__":
app.run(host="127.0.0.1", port=5000, debug=True)
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