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49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
# ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========
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"""
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Trace ID middleware.
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Reads X-Trace-ID from request header (or generates UUID v4), injects into
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request.state and contextvars, and adds to response headers.
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"""
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from starlette.middleware.base import BaseHTTPMiddleware
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from starlette.requests import Request
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from app.shared.context import (
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ensure_trace_id,
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set_trace_id,
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get_trace_id,
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)
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TRACE_HEADER = "X-Trace-ID"
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class TraceIDMiddleware(BaseHTTPMiddleware):
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"""ASGI middleware that propagates X-Trace-ID through the request lifecycle."""
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async def dispatch(self, request: Request, call_next):
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incoming = request.headers.get(TRACE_HEADER)
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trace_id = ensure_trace_id(incoming)
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set_trace_id(trace_id)
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request.state.trace_id = trace_id
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response = await call_next(request)
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if TRACE_HEADER not in response.headers:
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response.headers[TRACE_HEADER] = trace_id
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return response
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