first commit

backend/app/voice/session_store.py

@@ -0,0 +1,50 @@
+import json
+from datetime import datetime, timezone
+from typing import Any
+
+import redis.asyncio as redis
+
+from ..config import settings
+
+_redis_client: redis.Redis | None = None
+
+
+def _session_key(session_token: str) -> str:
+    return f"voice:session:{session_token}"
+
+
+async def get_redis() -> redis.Redis:
+    global _redis_client
+    if _redis_client is None:
+        _redis_client = redis.from_url(settings.redis_url, decode_responses=True)
+    return _redis_client
+
+
+async def save_session(session_token: str, data: dict[str, Any]) -> None:
+    client = await get_redis()
+    payload = dict(data)
+    payload["session_token"] = session_token
+    payload.setdefault("created_at", datetime.now(timezone.utc).isoformat())
+    await client.set(_session_key(session_token), json.dumps(payload), ex=settings.voice_session_ttl_seconds)
+
+
+async def get_session(session_token: str) -> dict[str, Any] | None:
+    client = await get_redis()
+    raw = await client.get(_session_key(session_token))
+    if not raw:
+        return None
+    return json.loads(raw)
+
+
+async def update_session(session_token: str, **fields: Any) -> dict[str, Any] | None:
+    session = await get_session(session_token)
+    if not session:
+        return None
+    session.update(fields)
+    await save_session(session_token, session)
+    return session
+
+
+async def delete_session(session_token: str) -> None:
+    client = await get_redis()
+    await client.delete(_session_key(session_token))