feat: 增加桌面端登录、视频清单和封面缓存

server/services/sessions.py

@@ -0,0 +1,56 @@
+import threading
+
+from server.services.device import DeviceProfile
+
+
+class SessionStore:
+    def __init__(self) -> None:
+        self._lock = threading.Lock()
+        self._devices: dict[str, DeviceProfile] = {}
+        self._active = ""
+        self._profile: dict | None = None
+        self._revision = 0
+
+    def bind(self, token: str, device: DeviceProfile, replace: bool = False) -> DeviceProfile:
+        with self._lock:
+            if replace or token not in self._devices:
+                self._devices[token] = device
+            return self._devices[token]
+
+    def device_for(self, token: str) -> DeviceProfile | None:
+        with self._lock:
+            return self._devices.get(token)
+
+    def remember(self, token: str, profile: dict) -> None:
+        with self._lock:
+            self._active = token
+            self._profile = dict(profile)
+            self._revision += 1
+
+    def set_profile(self, token: str, profile: dict) -> bool:
+        with self._lock:
+            if token != self._active:
+                return False
+            self._profile = dict(profile)
+            self._revision += 1
+            return True
+
+    def active_token(self) -> str:
+        with self._lock:
+            return self._active
+
+    def snapshot(self) -> dict | None:
+        with self._lock:
+            if not self._active or self._profile is None:
+                return None
+            return {"profile": dict(self._profile), "revision": self._revision}
+
+    def clear(self, token: str) -> None:
+        with self._lock:
+            self._devices.pop(token, None)
+            if self._active == token:
+                self._active = ""
+                self._profile = None
+
+
+sessions = SessionStore()