How Can I Execute Background Tasks in My FastAPI Application?

Background Thread Execution in FastAPI

In FastAPI, executing a task in the background can be necessary for operations that are unrelated to API functionality. To achieve this, developers must consider various approaches based on their requirements.

Option 1: Threading Before Uvicorn Run

Starting a thread before calling uvicorn.run ensures that the thread is executed while uvicorn.run is running alongside it. This approach prevents blocking the thread responsible for handling API requests.

Option 2: Event Scheduler

Repeating events can be scheduled using schedulers such as those provided by the sched module. This approach allows for the execution of the task at regular intervals.

Option 3: Asynchronous Def Function and Event Loop Integration

Async def functions can be added to the event loop using asyncio.create_task. This method allows the task to run concurrently with API handling tasks.

Additional Considerations

• Startup and Shutdown Events: These events can be used to execute tasks before application startup and after shutdown.
• Lifecycle Event: FastAPI allows for the definition of lifespan events using a context manager, providing flexibility in handling lifecycle-related tasks.
• Other Solutions: Alternative options such as ApScheduler's AsyncIOScheduler can be explored for scheduling tasks.

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