[feat] add fastapi adapter

adapter/http/fastapi/lifespan.py

@@ -0,0 +1,31 @@
+from collections.abc import AsyncIterator
+from contextlib import asynccontextmanager
+
+from opentelemetry.instrumentation.fastapi import FastAPIInstrumentor
+
+from adapter.di.container import build_container
+from adapter.http.fastapi.dependencies import APP_CONFIG_STATE, APP_CONTAINER_STATE
+from fastapi import FastAPI
+
+
+@asynccontextmanager
+async def app_lifespan(app: FastAPI) -> AsyncIterator[None]:
+    config = getattr(app.state, APP_CONFIG_STATE, None)
+    if config is None:
+        raise RuntimeError('config unavailable')
+
+    container = build_container(config=config)
+    instrumented = False
+    setattr(app.state, APP_CONTAINER_STATE, container)
+
+    try:
+        FastAPIInstrumentor.instrument_app(
+            app,
+            tracer_provider=container.observability.tracer_provider,
+        )
+        instrumented = True
+        yield
+    finally:
+        if instrumented:
+            FastAPIInstrumentor.uninstrument_app(app)
+        container.shutdown()