Ytukyg

I have a flask rest API setup correctly.
Once I hit the rest API, I want to run a python script/function and return with a runID and then user can hit another rest API with the runID to get information.

How can I return immediately and keep another python script/function running in another thread/process?

Following is my rest API

@app.route('/start/', methods=['POST'])

def start_run():

    run_id = "SOME RANDOM NUMBER"

    # I want to start python script here

    return run_id



@app.rout('/get_report', methods=['GET'])

def get_report():

    run_id = request.args("run_id")

    return some_method(run_id)

Running long-running background task is a complex process for singleton wsgi based project. Best approach is to use some kind of background scheduler like celery, apschedular. This answer based on celery approach.

There is good tutorial for how to run celery background task and you can use that in your project.

Take look for below example.

@celery.task()

def add_together(a, b):

    return a + b



result = add_together.delay(23, 42) # Create celery instance for this job

print(result.request.id) # Print celery task id

By default celery provide state and you can use that as well.

task = result.AsyncResult(task_id)

print(task.state)