first commit

api/app/config_store.py

@@ -0,0 +1,41 @@
+import json
+from pathlib import Path
+from typing import Optional
+
+import anyio
+
+from .models import AppConfig
+
+
+class ConfigStore:
+  def __init__(self, file_path: Path):
+    self._file_path = file_path
+    self._lock = anyio.Lock()
+
+  def _write_unlocked(self, cfg: AppConfig) -> None:
+    self._file_path.parent.mkdir(parents=True, exist_ok=True)
+    self._file_path.write_text(
+      json.dumps(cfg.model_dump(mode="json"), indent=2, ensure_ascii=False),
+      encoding="utf-8",
+    )
+
+  async def load(self) -> AppConfig:
+    async with self._lock:
+      if not self._file_path.exists():
+        cfg = AppConfig(cameras=[])
+        self._write_unlocked(cfg)
+        return cfg
+
+      raw = self._file_path.read_text(encoding="utf-8")
+      data = json.loads(raw) if raw.strip() else {}
+      return AppConfig.model_validate(data)
+
+  async def save(self, cfg: AppConfig) -> None:
+    async with self._lock:
+      self._write_unlocked(cfg)
+
+
+def default_store(project_root: Optional[Path] = None) -> ConfigStore:
+  root = project_root or Path(__file__).resolve().parents[2]
+  return ConfigStore(root / "api" / "data" / "config.json")
+