kennel/middleware.py


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import uuid

import structlog
from fastapi import Request

from .app import app, logger


@app.middleware("http")
async def logger_middleware(request: Request, call_next):
    structlog.contextvars.clear_contextvars()
    structlog.contextvars.bind_contextvars(
        path=request.url.path,
        method=request.method,
        client_host=request.client.host,
        request_id=str(uuid.uuid4()),
    )
    response = await call_next(request)

    structlog.contextvars.bind_contextvars(
        status_code=response.status_code,
    )

    # Exclude /healthcheck endpoint from producing logs
    if request.url.path != "/healthcheck":
        if 400 <= response.status_code < 500:
            logger.warn("Client error")
        elif response.status_code >= 500:
            logger.error("Server error")
        else:
            logger.info("OK")

    return response