Trace middleware in Fastapi

[Meemaw]

Summary of problem

It seems middlewares are not traced in fastapi.

Moreover, trying to use tracer.get_log_correlation_context() within a middleware will not return any active context, which means we can't operate with traceId (e.g to enrich response/logs within a middleware).

https://fastapi.tiangolo.com/tutorial/middleware/

Which version of dd-trace-py are you using?

1.5.2

[brettlangdon]

@Meemaw thank you for opening this issue.

We do not support creating spans automatically from FastAPI middleware.

But I would have expected there to be an active root fastapi.request span that is accessible from the middleware.

Do you have a minimal reproducible setup? I assume just FastAPI with a route, and then a custom middleware that tries to access the current active span (get_log_correlation_context() is one way) ?

[Meemaw]

I would have expected that as well. Should be reproducible with just any route, and just adding a custom middleware.