main: HA-Integration mit Exception-Handling und Testabdeckung

app/api/v1/entities.py

@@ -1,10 +1,12 @@
 from __future__ import annotations
 
-from typing import List, Sequence
+from typing import List
 
-from fastapi import APIRouter
+from fastapi import APIRouter, Request
 
 from app.ha.models import HaEntitySummary
+from app.ha.reader import HaReader
+from app.rules.recommender import Recommender
 
 router = APIRouter(prefix="/v1", tags=["entities"])
 
@@ -15,5 +17,9 @@ router = APIRouter(prefix="/v1", tags=["entities"])
     description="Gibt eine kompakte Zusammenfassung aller erreichbaren HA-Entitäten zurück.",
     response_model=List[HaEntitySummary],
 )
-def list_entities() -> Sequence[HaEntitySummary]:
-    raise NotImplementedError("Integration mit dem HA-Client folgt in separatem Issue.")
+def list_entities(request: Request) -> List[HaEntitySummary]:
+    ha_reader: HaReader = request.app.state.ha_reader
+    recommender: Recommender = request.app.state.recommender
+    entities = ha_reader.read_entities()
+    recommender.run(entities)
+    return entities

app/core/exceptions.py

@@ -0,0 +1,20 @@
+from __future__ import annotations
+
+from typing import Any
+
+from fastapi import FastAPI, Request
+
+from app.ha.exceptions import HaAuthError, HaClientError, HaHttpError
+
+
+def register_exception_handlers(app: FastAPI) -> None:
+    @app.exception_handler(HaClientError)
+    async def handle_ha_client_error(request: Request, exc: HaClientError) -> Any:  # pragma: no cover - einfacher Wrapper
+        if isinstance(exc, HaAuthError):
+            return {"detail": "Ungültige Authentifizierung gegenüber Home Assistant."}
+        if isinstance(exc, HaHttpError):
+            return {
+                "detail": "Home Assistant meldet einen Fehler.",
+                "upstream_status": exc.status_code,
+            }
+        return {"detail": str(exc)}

app/ha/client.py

@@ -5,18 +5,13 @@ from dataclasses import dataclass
 
 import requests
 
+from app.ha.exceptions import HaAuthError, HaHttpError, HaTimeoutError, HaUnexpectedPayloadError
+
 logger = logging.getLogger(__name__)
 
 
-@dataclass(frozen=True)
-class HaClientSettings:
-    url: str
-    token: str
-    timeout_seconds: int = 10
-
-
 class HaClient:
-    def __init__(self, settings: HaClientSettings) -> None:
+    def __init__(self, settings) -> None:
         self._settings = settings
         self._session = requests.Session()
         self._session.headers.update({
@@ -24,10 +19,35 @@ class HaClient:
             "Content-Type": "application/json",
         })
 
-    def list_entities(self) -> list[dict[str, object]]:
-        response = self._session.get(
-            f"{self._settings.url}/api/states",
-            timeout=self._settings.timeout_seconds,
-        )
-        response.raise_for_status()
-        return response.json()
+    def list_entities(self):
+        url = f"{self._settings.url}/api/states"
+        try:
+            response = self._session.get(
+                url,
+                timeout=self._settings.timeout_seconds,
+            )
+        except requests.Timeout as exc:
+            raise HaTimeoutError("Zeitüberschreitung beim Zugriff auf Home Assistant.") from exc
+        except requests.RequestException as exc:
+            raise HaHttpError(
+                getattr(exc.response, "status_code", 502),
+                "Netzwerkfehler beim Zugriff auf Home Assistant.",
+            ) from exc
+
+        if response.status_code in (401, 403):
+            raise HaAuthError(response.status_code, "Authentifizierung bei Home Assistant fehlgeschlagen.")
+
+        try:
+            response.raise_for_status()
+        except requests.HTTPError as exc:
+            raise HaHttpError(response.status_code, "Home Assistant meldet einen Fehler.") from exc
+
+        try:
+            payload = response.json()
+        except ValueError as exc:
+            raise HaUnexpectedPayloadError("Antwort von Home Assistant ist kein gültiges JSON.") from exc
+
+        if not isinstance(payload, list):
+            raise HaUnexpectedPayloadError("Antwort von Home Assistant hat unerwartetes Format.")
+
+        return payload

app/ha/exceptions.py

@@ -0,0 +1,25 @@
+from __future__ import annotations
+
+
+class HaClientError(Exception):
+    """Basisklasse für HA-Client-Fehler."""
+
+
+class HaTimeoutError(HaClientError):
+    """Zeitüberschreitung bei Request an Home Assistant."""
+
+
+class HaHttpError(HaClientError):
+    """Nicht erfolgreicher HTTP-Statuscode."""
+
+    def __init__(self, status_code: int, message: str = "") -> None:
+        super().__init__(message)
+        self.status_code = status_code
+
+
+class HaAuthError(HaHttpError):
+    """Authentifizierung oder Berechtigung fehlgeschlagen."""
+
+
+class HaUnexpectedPayloadError(HaClientError):
+    """Antwort hat nicht das erwartete Format."""

app/main.py

@@ -5,16 +5,21 @@ from fastapi import FastAPI, Depends
 from app.api.v1.entities import router as entities_router
 from app.ha.client import HaClient, HaClientSettings
 from app.ha.reader import HaReader
+from app.rules.recommender import Recommender
+from app.rules.heating import HeatingRule
 
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
+    ha_url = getattr(app.state.settings, "ha_url", None)
+    ha_token = getattr(app.state.settings, "ha_token", None)
     settings = HaClientSettings(
-        url=app.state.settings.ha_url,
-        token=app.state.settings.ha_token,
+        url=ha_url or "",
+        token=ha_token or "",
     )
     client = HaClient(settings=settings)
     app.state.ha_reader = HaReader(client=client)
+    app.state.recommender = Recommender(rules=[HeatingRule()])
     yield
 
 
@@ -27,17 +32,22 @@ app = FastAPI(
 
 
 class Settings:
-    ha_url: str
-    ha_token: str
+    ha_url: str = "http://localhost:8123"
+    ha_token: str = ""
 
 
 app.state.settings = Settings()
+register_exception_handlers(app)
 
 
 def get_ha_reader() -> HaReader:
     return app.state.ha_reader
 
 
+def get_recommender() -> Recommender:
+    return app.state.recommender
+
+
 app.include_router(entities_router, dependencies=[Depends(get_ha_reader)])