Question 1

How to set up FastAPI-Events with AWS SQS for event forwarding?

Accepted Answer

Install the AWS extras with `pip install fastapi-events[aws]`, then register SQSForwardHandler in the middleware with your queue URL and region. The handler automatically serializes events to JSON and forwards them to the specified SQS queue, as shown in the built-in handlers section.

Question 2

FastAPI-Events vs Celery: which is better for background tasks in FastAPI?

Accepted Answer

FastAPI-Events is tightly integrated with FastAPI/Starlette for lightweight, in-process event handling after responses, ideal for decoupling logic. Celery is a full distributed task queue system better for heavy, long-running tasks across multiple workers, but requires more setup and external brokers.

Question 3

How to validate event payloads using Pydantic in FastAPI-Events?

Accepted Answer

Register a Pydantic model with the event name using the payload_schema registry. When dispatching events with registered schemas, validation is automatic; for unregistered events, no validation occurs, as demonstrated in the validation examples with error handling.

Question 4

Can I dispatch events from outside a web request in FastAPI-Events?

Accepted Answer

Yes, but it requires setting a custom middleware_id when creating the middleware and passing it to dispatch() to avoid LookupError. The README provides a detailed example under 'Dispatching events outside of a request' using background tasks.

Question 5

Does FastAPI-Events support retry logic for failed event handlers?

Accepted Answer

No, the library doesn't include built-in retry mechanisms or dead-letter queues. Developers must implement their own error handling and retry logic within custom handlers, which can add complexity for production resilience.

Question 6

How to use dependencies like database sessions in local event handlers?

Accepted Answer

Since version 0.9.0, you can use FastAPI dependencies in local handlers by adding Depends() in the handler function. However, generators with yield are not yet supported, as noted in the 'Using Dependencies in Local Handler' section.

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