fix: advertise retry delay on context timeout (#40)

src/main.py

@@ -1,4 +1,5 @@
 import asyncio
+import math
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
@@ -75,7 +76,9 @@ async def context() -> JSONResponse:
                 {"panel": "gitea", "action": "set GITEA_URL + GITEA_TOKEN", "target": "/root/stackchain-dashboard/.env or systemd env", "priority": "high"},
             ],
             "error": error_message,
-        })
+        }, headers={
+            "Retry-After": str(max(1, math.ceil(CONTEXT_TIMEOUT_SECONDS)))
+        } if isinstance(e, TimeoutError) else None)
     user_model = User(id=user_data["id"], login=user_data["login"], full_name=user_data.get("full_name", ""), email=user_data.get("email", ""))
     repo_models = [
         Repo(id=r["id"], name=r["name"], full_name=r["full_name"], description=r.get("description", ""), url=r["html_url"], updated_at=r.get("updated_at", ""))

tests/test_context_timeout.py

@@ -27,6 +27,7 @@ async def test_context_returns_fallback_when_gitea_exceeds_deadline(monkeypatch)
     response = await main.context()
 
     assert response.status_code == 200
+    assert response.headers["retry-after"] == "1"
     assert b'"repos":[]' in response.body
     assert b'"error":"Gitea context request timed out after 0.01s"' in response.body
     assert cancelled.is_set()