Prepare monorepo

backend/app/util/errors.py

@@ -0,0 +1,14 @@
+class NotFoundError(Exception):
+    pass
+
+
+class InvalidStateError(Exception):
+    pass
+
+
+class InsufficientPermissionsError(Exception):
+    pass
+
+
+class InvalidTokenAudienceError(Exception):
+    pass

backend/app/util/websocket_wrapper.py

@@ -0,0 +1,25 @@
+import logging
+from fastapi import WebSocket, WebSocketDisconnect
+from websockets import ConnectionClosed
+
+logger = logging.getLogger("gunicorn.error")
+
+# Wrapper to transform a FastAPI websocket to a standard websocket
+class WebSocketWrapper():
+    def __init__(self, websocket: WebSocket):
+        self._websocket = websocket
+
+    async def recv(self) -> str:
+        try:
+            text = await self._websocket.receive_text()
+            logger.info("Message received: %s", text)
+            return text
+        except WebSocketDisconnect as e:
+            raise ConnectionClosed(e.code, 'WebSocketWrapper')
+
+    async def send(self, msg: str) -> None:
+        logger.info("Message sent: %s", msg)
+        await self._websocket.send_text(msg)
+
+    async def close(self, code: int, reason: str) -> None:
+        await self._websocket.close(code)