如何解决Flask 再次或两次重新启动已经在执行的函数
在我使用 flask-ngrok 作为服务器运行的 Flask 应用程序中，在 app.route('/summ',methods=['POST']) 中有一个名为 summarise("vdeo.mp4") 的函数调用。此功能是一个视频摘要功能，它接收视频并进行摘要并将该视频的一些图像输出到一个文件夹中，并运行约 6 分钟的 6 秒视频。问题是，调用该函数五分钟后，
路线 app.route('/summ',methods=['POST']) 再次执行并再次调用 summarise("vdeo.mp4")。但是最初的函数调用并没有停止，而是完成了。为什么会调用两次？这是在 Google Colab 中执行的。
代码：
app = Flask(__name__)
run_with_ngrok(app)
@app.route('/')
def home():
print("rendering home")
return render_template('index.html')
#problems here
@app.route('/summ',methods=['POST'])
def start_summ():
if request.method == 'POST':
print(datetime.Now().strftime("%H:%M:%s"))
print("summarise(vdeo.mp4) started")
summarise("vdeo.mp4") #executed again after 5 minutes.
return render_template('process.html')
return "Failed"
if __name__ == '__main__':
app.debug = False
app.use_reloader = False
app.threaded = True
app.run()
错误：
2021-05-28 13:42:46.234549: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcudart.so.11.0
2021-05-28 13:42:48.554359: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcuda.so.1
2021-05-28 13:42:48.565276: E tensorflow/stream_executor/cuda/cuda_driver.cc:328] Failed call to cuInit: CUDA_ERROR_NO_DEVICE: no CUDA-capable device is detected
2021-05-28 13:42:48.565322: I tensorflow/stream_executor/cuda/cuda_diagnostics.cc:156] kernel driver does not appear to be running on this host (a43cda5a69a5): /proc/driver/nvidia/version does not exist
* Serving Flask app "app_1" (lazy loading)
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production Wsgi server instead.
* Debug mode: off
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
* Running on http://25edff30f9c4.ngrok.io
* Traffic stats available on http://127.0.0.1:4040
rendering home
127.0.0.1 - - [28/May/2021 13:44:01] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [28/May/2021 13:44:02] "GET /static/main.css HTTP/1.1" 200 -
127.0.0.1 - - [28/May/2021 13:44:02] "GET /favicon.ico HTTP/1.1" 404 -
127.0.0.1 - - [28/May/2021 13:44:02] "GET /static/upload-button.png HTTP/1.1" 200 -
13:44:06
summarise(vdeo.mp4) started
vdeo
/content/drive/MyDrive/VSWKC/Summariser/vdeo created at time : 13:44:06
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2021-05-28 13:47:36.177896: I tensorflow/compiler/mlir/mlir_graph_optimization_pass.cc:176] None of the MLIR Optimization Passes are enabled (registered 2)
2021-05-28 13:47:36.178315: I tensorflow/core/platform/profile_utils/cpu_utils.cc:114] cpu Frequency: 2200155000 Hz
13:49:06
summarise(vdeo.mp4) started
vdeo
/content/drive/MyDrive/VSWKC/Summariser/vdeo created at time : 13:49:07
[2021-05-28 13:49:07,258] ERROR in app: Exception on /summ [POST]
Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/flask/app.py",line 2447,in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.7/dist-packages/flask/app.py",line 1952,in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.7/dist-packages/flask/app.py",line 1821,in handle_user_exception
reraise(exc_type,exc_value,tb)
File "/usr/local/lib/python3.7/dist-packages/flask/_compat.py",line 39,in reraise
raise value
File "/usr/local/lib/python3.7/dist-packages/flask/app.py",line 1950,in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.7/dist-packages/flask/app.py",line 1936,in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/content/drive/MyDrive/VSWKC/Summariser/app_1.py",line 28,in start_summ
summarise("vdeo.mp4") #executed twice
File "/content/drive/.shortcut-targets-by-id/1HWYQxcmxJ83JvqPNLCUX4xZ77IoSXRGV/VSWKC/Summariser/test.py",line 418,in summarise
run_sum(source_vid,req_clsuter)
File "/content/drive/.shortcut-targets-by-id/1HWYQxcmxJ83JvqPNLCUX4xZ77IoSXRGV/VSWKC/Summariser/test.py",line 358,in run_sum
os.mkdir(path)
FileExistsError: [Errno 17] File exists: '/content/drive/MyDrive/VSWKC/Summariser/vdeo'
127.0.0.1 - - [28/May/2021 13:49:07] "POST /summ HTTP/1.1" 500 -
[0,7,2,6,9,1,8,4,3,5,0]
447
in fe mkdir /content/drive/MyDrive/VSWKC/Summariser/vdeo/cluster
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