FastAPI - Middleware and Hooks
How can you combine FastAPI lifespan context manager with a third-party async library that requires explicit startup and shutdown calls?
How can you combine FastAPI lifespan context manager with a third-party async library that requires explicit startup and shutdown calls?
hard🚀 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Use async def and await for async third-party calls
Third-party startup and shutdown are async, so await is required.Step 2: Accept app parameter for lifespan signature
Lifespan must accept app parameter even if unused.Final Answer:
async def lifespan(app: FastAPI):\n await third_party.startup()\n yield\n await third_party.shutdown() -> Option AQuick Check:
Async lifespan with await and app parameter [OK]
Quick Trick: Await async startup/shutdown inside lifespan [OK]
Common Mistakes:
MISTAKES- Missing async/await
- Omitting app parameter
- Using sync calls for async functions
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