async function stops while backend threadpoolexecutor is running

Imekamilika Ilichapishwa Mwaka 1 uliopita Kulipwa wakati wa kujifungua
Imekamilika Kulipwa wakati wa kujifungua

I am trying to build a progress bar on my home page ([login to view URL]) using async function. async function awaits for fetch from flask function @progress, and based on the fetched data, it updates the progress bar.

In flask, I have multithreaded API calls, which are initiated within @home function after the submit button is pressed from the [login to view URL] page. Submit button is part of a wtf form.

After succesful completion of threads, there is redirect to @output where the result is displayed in output.html.

This works perfectly in chrome browser in PC environment. However, in azure hosted environment, the async javascript function stops while the threadpoolexecutor is running in the backend. I cannot see the async function running in the log stream. The progress bar also stops updating since async has stopped.

Just before redirect for output, the last status is displayed in the progress bar.

** Backend Flask**

@[login to view URL]('/', methods=['GET', 'POST'])

def home():

global TEMP_FILES

topic_form = TopicForm()

threads = []

if topic_form.validate_on_submit():

with ThreadPoolExecutor(max_workers=20) as executor:

for index, pdf_path in enumerate(TEMP_FILES):

[login to view URL]([login to view URL](xxx, xxx,xxx))

wait(threads)

return redirect(url_for('output'))

return render_template("[login to view URL]", topic_form=topic_form)

@[login to view URL]('/progress/<int:file_id>')

def progress(file_id):

try:

status_dict = {'status': 'xyz, 'value':'123'}

except IndexError:

status_dict = {'status': "Start", 'value': "1"}

return [login to view URL](status_dict)

**In the [login to view URL]**

<form method="POST">

{{ topic_form.csrf_token }}

{{ [login to view URL] }}

</form>

<p>The executions takes about 20 - 30 secs per file.</p>

<h5>File 1 - Progress Bar</h5>

<div class="progress progress-striped active">

<div id="file0-bar" class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100" style="width: 1%">Start</div>

</div>

**Script**

<script>

var timeout;

async function getStatus() {

let get_0;

try {

const res_0 = await fetch("/progress/0");

get_0 = await [login to view URL]();

} catch (e) {

[login to view URL]("Error: ", e);

}

[login to view URL]("file0-bar").innerHTML = [login to view URL];

[login to view URL]("file0-bar").style.width= [login to view URL] + "%";

timeout = setTimeout(getStatus, 1000);

}

getStatus();

</script>

JavaScript Software Architecture Python Flask HTML5

Kitambulisho cha Mradi: #35905844

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manojmo

hi, Are there any errors in the javascript console( dev tools ) ? What is the status code for the async request in the network tab of dev tools ? Does the async request get logged on the server even once ? Btw, is t Zaidi

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vijaydvaswani

It seems that the issue with the progress bar not updating in the hosted environment is due to the fetch requests being blocked by some security measures. The fact that it works locally in a PC environment suggests tha Zaidi

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