Sergey Antropoff
43 lines
1.4 KiB
Python
43 lines
1.4 KiB
Python
"""Request correlation and access logging middleware."""
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from __future__ import annotations
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import logging
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import time
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import uuid
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from collections.abc import Awaitable, Callable
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from fastapi import Request, Response
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from starlette.middleware.base import BaseHTTPMiddleware
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logger = logging.getLogger(__name__)
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RequestHandler = Callable[[Request], Awaitable[Response]]
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class RequestContextMiddleware(BaseHTTPMiddleware):
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"""Attach a bounded request ID and log one structured completion event."""
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def __init__(self, app: object, header_name: str) -> None:
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super().__init__(app) # type: ignore[arg-type]
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self._header_name = header_name
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async def dispatch(self, request: Request, call_next: RequestHandler) -> Response:
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supplied = request.headers.get(self._header_name, "")
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request_id = supplied if 0 < len(supplied) <= 128 else str(uuid.uuid4())
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request.state.request_id = request_id
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started = time.monotonic()
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response = await call_next(request)
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response.headers[self._header_name] = request_id
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logger.info(
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"request completed",
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extra={
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"request_id": request_id,
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"method": request.method,
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"path": request.url.path,
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"status": response.status_code,
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"duration_ms": round((time.monotonic() - started) * 1000, 3),
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},
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)
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return response
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