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72 lines
3 KiB
Python
72 lines
3 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the terms described in the LICENSE file in
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# the root directory of this source tree.
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from aiohttp import hdrs
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from llama_stack.core.external import ExternalApiSpec
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from llama_stack.core.server.routes import find_matching_route, initialize_route_impls
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from llama_stack.log import get_logger
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from llama_stack.providers.utils.telemetry.tracing import end_trace, start_trace
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logger = get_logger(name=__name__, category="core::server")
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class TracingMiddleware:
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def __init__(self, app, impls, external_apis: dict[str, ExternalApiSpec]):
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self.app = app
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self.impls = impls
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self.external_apis = external_apis
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# FastAPI built-in paths that should bypass custom routing
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self.fastapi_paths = ("/docs", "/redoc", "/openapi.json", "/favicon.ico", "/static")
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async def __call__(self, scope, receive, send):
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if scope.get("type") == "lifespan":
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return await self.app(scope, receive, send)
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path = scope.get("path", "")
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# Check if the path is a FastAPI built-in path
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if path.startswith(self.fastapi_paths):
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# Pass through to FastAPI's built-in handlers
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logger.debug(f"Bypassing custom routing for FastAPI built-in path: {path}")
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return await self.app(scope, receive, send)
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if not hasattr(self, "route_impls"):
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self.route_impls = initialize_route_impls(self.impls, self.external_apis)
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try:
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_, _, route_path, webmethod = find_matching_route(
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scope.get("method", hdrs.METH_GET), path, self.route_impls
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)
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except ValueError:
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# If no matching endpoint is found, pass through to FastAPI
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logger.debug(f"No matching route found for path: {path}, falling back to FastAPI")
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return await self.app(scope, receive, send)
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trace_attributes = {"__location__": "server", "raw_path": path}
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# Extract W3C trace context headers and store as trace attributes
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headers = dict(scope.get("headers", []))
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traceparent = headers.get(b"traceparent", b"").decode()
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if traceparent:
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trace_attributes["traceparent"] = traceparent
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tracestate = headers.get(b"tracestate", b"").decode()
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if tracestate:
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trace_attributes["tracestate"] = tracestate
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trace_path = webmethod.descriptive_name or route_path
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trace_context = await start_trace(trace_path, trace_attributes)
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async def send_with_trace_id(message):
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if message["type"] == "http.response.start":
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headers = message.get("headers", [])
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headers.append([b"x-trace-id", str(trace_context.trace_id).encode()])
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message["headers"] = headers
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await send(message)
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try:
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return await self.app(scope, receive, send_with_trace_id)
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finally:
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await end_trace()
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