wehub-resource-sync
64 lines
2.5 KiB
Python
64 lines
2.5 KiB
Python
"""Gateway request trace middleware."""
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from __future__ import annotations
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import logging
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from typing import Any
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from starlette.datastructures import Headers, MutableHeaders
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from starlette.types import ASGIApp, Message, Receive, Scope, Send
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from deerflow.config.app_config import is_trace_correlation_enabled
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from deerflow.trace_context import TRACE_ID_HEADER, request_trace_context
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logger = logging.getLogger(__name__)
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class TraceMiddleware:
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"""Bind a request-level trace id and write it to HTTP response headers.
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The ``enabled`` flag is a **startup snapshot** rather than a per-request
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live read: ``logging`` is registered as restart-required in
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``deerflow.config.reload_boundary.STARTUP_ONLY_FIELDS`` because
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``configure_logging()`` only installs the trace-context filter and
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formatter during app.py lifespan startup. Reading ``logging.enhance.enabled``
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live here would let a runtime config edit surface the response
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``X-Trace-Id`` header and Langfuse ``deerflow_trace_id`` immediately while
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the log formatter stays on its startup value, contradicting the
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restart-required contract IDE hover surfaces on ``AppConfig.logging``.
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"""
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def __init__(self, app: ASGIApp, *, enabled: bool):
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self.app = app
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self.enabled = bool(enabled)
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async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
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if scope["type"] != "http" or not self.enabled:
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await self.app(scope, receive, send)
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return
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headers = Headers(scope=scope)
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incoming_trace_id = headers.get(TRACE_ID_HEADER)
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with request_trace_context(incoming_trace_id) as trace_id:
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async def send_with_trace(message: Message) -> None:
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if message["type"] == "http.response.start":
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response_headers = MutableHeaders(scope=message)
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response_headers[TRACE_ID_HEADER] = trace_id
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await send(message)
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await self.app(scope, receive, send_with_trace)
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def resolve_trace_enabled(config: Any) -> bool:
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"""Read ``logging.enhance.enabled`` from an ``AppConfig``-like object.
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Thin backwards-compatible alias around
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:func:`deerflow.config.app_config.is_trace_correlation_enabled`, kept so
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existing gateway callers and tests do not have to switch imports. Both
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the Gateway middleware and the embedded ``DeerFlowClient`` resolve the
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gate through the same harness helper so their behaviour cannot drift.
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"""
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return is_trace_correlation_enabled(config)
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