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Pydantic Logfire Documentation

ASGI

pydantic/logfire

ASGI¶

If the ASGI framework doesn't have a dedicated OpenTelemetry package, you can use the OpenTelemetry ASGI middleware.

Installation¶

You need to install the opentelemetry-instrumentation-asgi package:

pip install opentelemetry-instrumentation-asgi

Usage¶

Below we have a minimal example using Uvicorn. You can run it with python main.py:

main.py

import logfire
from opentelemetry.instrumentation.asgi import OpenTelemetryMiddleware


logfire.configure()


async def app(scope, receive, send):
    assert scope["type"] == "http"
    await send(
        {
            "type": "http.response.start",
            "status": 200,
            "headers": [(b"content-type", b"text/plain"), (b"content-length", b"13")],
        }
    )
    await send({"type": "http.response.body", "body": b"Hello, world!"})

app = OpenTelemetryMiddleware(app)

if __name__ == "__main__":
    import uvicorn

    uvicorn.run(app)

You can read more about the OpenTelemetry ASGI middleware here.

Capturing request and response headers¶