Dash: Get the post request query string parameters inside callback - plotly-dash

Question

I have a multi-page dash application.
app.py
pages
page_one.py
page_two.py
In app.py, I have
#callback(
Output(component_id="page-content", component_property="children"),
Input(component_id="url", component_property="pathname"),
)
def display_page(pathname):
if pathname == "/one":
return page_one.layout
elif pathname == "/two":
return page_two.layout
In page_one.py, I have few callbacks.
For eg:
Callback-1
#callback(
output=Output("paragraph_id", "children"),
inputs=Input("button_id", "n_clicks"),
background=True,
running=[
(Output("button_id", "disabled"), True, False),
(Output("cancel_button_id", "disabled"), False, True),
(
Output("paragraph_id", "style"),
{"visibility": "hidden"},
{"visibility": "visible"},
),
(
Output("progress_bar", "style"),
{"visibility": "visible"},
{"visibility": "hidden"},
),
],
cancel=Input("cancel_button_id", "n_clicks"),
progress=[Output("progress_bar", "value"), Output("progress_bar", "max")],
prevent_initial_call=True,
)
def update_progress_A(set_progress, n_clicks):
# Here I want to access the post request query string parameters
some code for- A
Callback-2
#callback(
output=Output("paragraph_id", "children"),
inputs=Input("button_id", "n_clicks"),
background=True,
running=[
(Output("button_id", "disabled"), True, False),
(Output("cancel_button_id", "disabled"), False, True),
(
Output("paragraph_id", "style"),
{"visibility": "hidden"},
{"visibility": "visible"},
),
(
Output("progress_bar", "style"),
{"visibility": "visible"},
{"visibility": "hidden"},
),
],
cancel=Input("cancel_button_id", "n_clicks"),
progress=[Output("progress_bar", "value"), Output("progress_bar", "max")],
prevent_initial_call=True,
)
def update_progress_B(set_progress, n_clicks):
# Here I want to access the post request query string parameters
some code for- B
Is it possible to get the post request query string parameters inside the callback?
Please suggest.
Updated: 1
I have docker services as below:
redis, postgres, web, celery, nginx
I have implemented demo code from dash website
#callback(
output=Output("paragraph_id", "children"),
inputs=Input("button_id", "n_clicks"),
background=True,
running=[
(Output("button_id", "disabled"), True, False),
(Output("cancel_button_id", "disabled"), False, True),
(
Output("paragraph_id", "style"),
{"visibility": "hidden"},
{"visibility": "visible"},
),
(
Output("progress_bar", "style"),
{"visibility": "visible"},
{"visibility": "hidden"},
),
],
cancel=Input("cancel_button_id", "n_clicks"),
progress=[Output("progress_bar", "value"), Output("progress_bar", "max")],
prevent_initial_call=True,
)
def update_progress(set_progress, n_clicks):
total = 5
# print("INPUTS: ", callback_context.inputs)
# print("INPUTS: ", callback_context.inputs_list)
for i in range(total + 1):
set_progress((str(i), str(total)))
time.sleep(1)
return f"Clicked {n_clicks} times"
When services are up, I observed following things in terminal:
For celery:
celery | [tasks]
celery | . long_callback_d0a7a49bfe3d30bfdd7a43d2a22db75123ff2fa9
After button clicking:
celery | [2022-12-27 20:18:43,090: INFO/MainProcess] Task long_callback_d0a7a49bfe3d30bfdd7a43d2a22db75123ff2fa9[b663bb71-6962-44a3-ae2c-00eb7d8869bf] received
proxy | 172.18.0.1 - - [27/Dec/2022:20:18:44 +0000] "POST /_dash-update-component?cacheKey=6067e37a0e1f0c07b6f9ff0d7ef0b208ae2783ba&job=b663bb71-6962-44a3-ae2c-00eb7d8869bf
celery | [2022-12-27 20:18:49,119: INFO/ForkPoolWorker-2] Task long_callback_d0a7a49bfe3d30bfdd7a43d2a22db75123ff2fa9[b663bb71-6962-44a3-ae2c-00eb7d8869bf] succeeded in 6.027637779999964s: None
This is working fine.
I am trying to get/access job parameter inside update_progress()
so that I can use this job parameter to pass in the result.AsyncResult(job) which is celery function inside update_progress() to get status, state of the running task, which I am trying to use to update progress bar.
Usecases:
Upload dataset: I'm using dcc.Upload() and file is getting uploaded successfully. e.g. user uploads data.csv
Create train, test, dev dataset files: I'm using dbc.Button() where user clicks it and all 3 files are getting created successfully [I have used sklearn]. e.g. we get train.csv, test.csv and dev.csv
Model training: I'm using dbc.Button() where user clicks it and model is getting generated and stored successfully. e.g. model.joblib