ACT-001: actuator-first sensor lifecycle

app/ha/client.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 import logging
 from dataclasses import dataclass
 from datetime import datetime
+import json
 import re
 from urllib.parse import quote
 
@@ -83,6 +84,32 @@ class HaClient:
             )
         return payload
 
+    def list_entity_metadata(self, entity_ids: list[str]) -> dict[str, dict[str, str | None]]:
+        if not entity_ids:
+            return {}
+        if any(not _ENTITY_ID_PATTERN.fullmatch(entity_id) for entity_id in entity_ids):
+            raise ValueError("entity_id enthält ein ungültiges Format.")
+        template = _metadata_template(entity_ids)
+        rendered = self._post_text("/api/template", {"template": template})
+        try:
+            payload = json.loads(rendered)
+        except json.JSONDecodeError as exc:
+            raise HaUnexpectedPayloadError("Entity-Metadaten konnten nicht gelesen werden.") from exc
+        if not isinstance(payload, list):
+            raise HaUnexpectedPayloadError("Entity-Metadaten haben ein unerwartetes Format.")
+        result: dict[str, dict[str, str | None]] = {}
+        for item in payload:
+            if not isinstance(item, dict):
+                raise HaUnexpectedPayloadError("Entity-Metadaten haben ein unerwartetes Format.")
+            entity_id = item.get("entity_id")
+            if not isinstance(entity_id, str) or "." not in entity_id:
+                raise HaUnexpectedPayloadError("Entity-Metadaten enthalten ungültige entity_id.")
+            result[entity_id] = {
+                key: _optional_string(item.get(key))
+                for key in ("area_id", "area_name", "device_id", "device_name")
+            }
+        return result
+
     def _get_json(
         self,
         path: str,
@@ -125,3 +152,57 @@ class HaClient:
             ) from exc
 
         return payload
+
+    def _post_text(self, path: str, payload: dict[str, str]) -> str:
+        try:
+            response = self._session.post(
+                f"{self._settings.url.rstrip('/')}{path}",
+                json=payload,
+                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(getattr(exc, "response", None), "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
+        return response.text
+
+
+def _metadata_template(entity_ids: list[str]) -> str:
+    ids = json.dumps(entity_ids, ensure_ascii=True)
+    return (
+        "{% set ids = "
+        f"{ids}"
+        " %}["
+        "{% for entity_id in ids %}"
+        "{% set device = device_id(entity_id) %}"
+        "{{ "
+        "{"
+        "\"entity_id\": entity_id,"
+        "\"area_id\": area_id(entity_id),"
+        "\"area_name\": area_name(entity_id),"
+        "\"device_id\": device,"
+        "\"device_name\": device_attr(device, 'name') if device else none"
+        "}"
+        " | tojson }}"
+        "{% if not loop.last %},{% endif %}"
+        "{% endfor %}]"
+    )
+
+
+def _optional_string(value: object) -> str | None:
+    if value is None or value == "":
+        return None
+    return str(value)