use fastapi lifespan (#183)

Author: vincentsarago

stac_fastapi/pgstac/app.py

@@ -6,8 +6,10 @@
 """
 
 import os
+from contextlib import asynccontextmanager
 
 from brotli_asgi import BrotliMiddleware
+from fastapi import FastAPI
 from fastapi.responses import ORJSONResponse
 from stac_fastapi.api.app import StacApi
 from stac_fastapi.api.middleware import CORSMiddleware, ProxyHeaderMiddleware
@@ -18,6 +20,7 @@
     create_post_request_model,
     create_request_model,
 )
+from stac_fastapi.api.openapi import update_openapi
 from stac_fastapi.extensions.core import (
     FieldsExtension,
     FilterExtension,
@@ -101,7 +104,26 @@
 post_request_model = create_post_request_model(extensions, base_model=PgstacSearch)
 get_request_model = create_get_request_model(extensions)
 
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """FastAPI Lifespan."""
+    await connect_to_db(app)
+    yield
+    await close_db_connection(app)
+
+
+fastapp = FastAPI(
+    openapi_url=settings.openapi_url,
+    docs_url=settings.docs_url,
+    redoc_url=None,
+    root_path=getattr(settings, "root_path", None),
+    lifespan=lifespan,
+)
+
+
 api = StacApi(
+    app=update_openapi(fastapp),
     settings=settings,
     extensions=extensions + [collection_search_extension]
     if collection_search_extension
@@ -125,18 +147,6 @@
 app = api.app
 
 
-@app.on_event("startup")
-async def startup_event():
-    """Connect to database on startup."""
-    await connect_to_db(app)
-
-
-@app.on_event("shutdown")
-async def shutdown_event():
-    """Close database connection."""
-    await close_db_connection(app)
-
-
 def run():
     """Run app from command line using uvicorn if available."""
     try: