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FastAPI Best Practices

Limit Only One Access to Endpoint at a Time​

Limit only one access to an endpoint at a time with asyncio.Lock in asyncio in FastAPI.

fastapi_request_lock.py
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NOTE: The asyncio.Lock only take effect in the asyncio loop level, if using unicorn to run server in multiple processes, it can not lock the request!

No limitation.

fastapi_request_nolock.py
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Limit only one access to an endpoint at a time with thread.Lock

Limit only one access to an endpoint at a time with process.Lock

Attach A Background Service Into the Application​

Run a background service behind the FastAPI server:

  • share the same asyncio main loop with the server
  • the service start when the server starts and stop when the server stops
  • it should be light-weight and non-CPU heavy workload

Coroutines and Tasks — Python 3.11.4 documentation Event Loop — Python 3.11.4 documentation

fastapi_background_service.py
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