Added backend compat local facts routes (#155)

Author: danyi1212

horizon/facts/dependencies.py

@@ -2,6 +2,7 @@
 
 from fastapi import Depends, Request, HTTPException
 from opal_client import OpalClient
+from loguru import logger
 
 from horizon.config import sidecar_config
 from horizon.facts.update_subscriber import DataUpdateSubscriber
@@ -35,9 +36,14 @@ def get_wait_timeout(request: Request) -> float | None:
     wait_timeout = request.headers.get(
         "X-Wait-timeout", sidecar_config.LOCAL_FACTS_WAIT_TIMEOUT
     )
+    if not wait_timeout:
+        return None
     try:
         wait_timeout = float(wait_timeout)
     except ValueError as e:
+        logger.error(
+            f"Invalid X-Wait-timeout header, expected float, got {wait_timeout!r}"
+        )
         raise HTTPException(
             status_code=400,
             detail=f"Invalid X-Wait-timeout header, expected float, got {wait_timeout!r}",

horizon/facts/router.py

@@ -294,6 +294,7 @@ async def forward_request_then_wait_for_update(
 @facts_router.api_route(
     "/{full_path:path}",
     methods=["DELETE", "GET", "HEAD", "OPTIONS", "PATCH", "POST", "PUT"],
+    include_in_schema=False,
 )
 async def forward_remaining_requests(
     request: FastApiRequest, client: FactsClientDependency, full_path: str

horizon/pdp.py

@@ -356,6 +356,13 @@ def _configure_api_routes(self, app: FastAPI):
             tags=["Local Facts API"],
             dependencies=[Depends(enforce_pdp_token)],
         )
+        app.include_router(
+            facts_router,
+            prefix="/v2/facts/{proj_id}/{env_id}",
+            tags=["Local Facts API (compat)"],
+            include_in_schema=False,
+            dependencies=[Depends(enforce_pdp_token)],
+        )
 
         # TODO: remove this when clients update sdk version (legacy routes)
         @app.post(