How to parallel run multiple background task?

[antx-code]

Code snippet:

from fastapi import APIRouter, Depends, BackgroundTasks
from pydantic import BaseModel
from loguru import logger

@logger.catch(level='ERROR')
@router.post('/create_task')
async def create_task(query_parm: CtaskModel, background_task: BackgroundTasks):
"""

some base code.

"""
background_task.add_task(ctask.run, target=[targets['target'], targets['website'].strip()], target_type=task_type, target_url=target_url)
background_task.add_task(vuln_verifier.dia, targets=[target_url], filter=False)
return msg(status='success', data=f'已成功创建{task_type}-website任务')

Description

I want to run ctask function and vuln_verifier function background task at the same time, but it run one by one.
How to parallel run background task A and background B ? The Task A(funciton ctask for me) and the task B(function vuln_verifier for me) are python package script I wrote.

Environment

• OS: manjaro 18.0.4
• FastAPI version: 0.63.0
• Python version: 3.8
• Uvicorn version: 0.11.8

[gyKa]

Hi,

I didn't find easy solution, but based on documentation you can use Celery and message broker.

[antx-code]

@gyKa Thank you for your answer. I have two methods now.
M1: use Celery and message broker
M2: develop Task A and Task B as gRPC service

[JeongHyeongKim]

https://apscheduler.readthedocs.io/en/stable/index.html
how about this
i research background task for batch service and i found the dependency above.

[antx-code]

https://apscheduler.readthedocs.io/en/stable/index.html
how about this
i research background task for batch service and i found the dependency above.

But it seems that just can scheduler tasks periodically, can not parallel excute different task in one time.

[YuriiMotov]

If the functions you want to run are async, you can use the approach described in this comment: #10682 (comment)

For sync functions you can modify that code to run functions in thread pool and gather and await results