django-plotly-dash中的长回调或后台回调

zysjyyx4  于 2023-06-07  发布在  Go
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我最近一直在使用django-plotly-dash包,想知道我是否可以为我的应用程序的一个非常长时间运行的任务实现一个进度条。
下面我有我想实现的进度条的演示版本。这在django-plotly-dash包中是可能的吗?如果没有,有没有人有任何建议,我应该如何处理?
我非常感谢任何回复帮助,因为我有点卡住了...

import time
import os

import dash
from dash import DiskcacheManager, CeleryManager, Input, Output, html

if 'REDIS_URL' in os.environ:
    # Use Redis & Celery if REDIS_URL set as an env variable
    from celery import Celery
    celery_app = Celery(__name__, broker=os.environ['REDIS_URL'], backend=os.environ['REDIS_URL'])
    background_callback_manager = CeleryManager(celery_app)

else:
    # Diskcache for non-production apps when developing locally
    import diskcache
    cache = diskcache.Cache("./cache")
    background_callback_manager = DiskcacheManager(cache)

app = dash.Dash(__name__, background_callback_manager=background_callback_manager)

app.layout = html.Div(
    [
        html.Div(
            [
                html.P(id="paragraph_id", children=["Button not clicked"]),
                html.Progress(id="progress_bar", value="0"),
            ]
        ),
        html.Button(id="button_id", children="Run Job!"),
        html.Button(id="cancel_button_id", children="Cancel Running Job!"),
    ]
)

@dash.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
    for i in range(total + 1):
        set_progress((str(i), str(total)))
        time.sleep(1)

    return f"Clicked {n_clicks} times"

if __name__ == "__main__":
    app.run_server(debug=True)
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我也会对同样的问题感兴趣:如何在django-plotly-dash中使用long/background回调?

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