catch websocket disconenct errors (#674)

cashu/mint/events/client.py

@@ -2,7 +2,7 @@
 import json
 from typing import List, Union
 
-from fastapi import WebSocket
+from fastapi import WebSocket, WebSocketDisconnect
 from loguru import logger
 
 from ...core.base import MeltQuote, MintQuote, ProofState
@@ -122,6 +122,9 @@ async def start(self):
                 resp = await self._handle_request(req)
                 # Send the response
                 await self._send_msg(resp)
+            except WebSocketDisconnect as e:
+                logger.debug(f"Websocket disconnected: {e}")
+                raise e
             except Exception as e:
                 err = JSONRPCErrorResponse(
                     error=JSONRPCError(

cashu/mint/router.py

@@ -1,7 +1,7 @@
 import asyncio
 import time
 
-from fastapi import APIRouter, Request, WebSocket
+from fastapi import APIRouter, Request, WebSocket, WebSocketDisconnect
 from loguru import logger
 
 from ..core.errors import KeysetNotFoundError
@@ -204,6 +204,7 @@ async def get_mint_quote(request: Request, quote: str) -> PostMintQuoteResponse:
 @router.websocket("/v1/ws", name="Websocket endpoint for subscriptions")
 async def websocket_endpoint(websocket: WebSocket):
     limit_websocket(websocket)
+    disconnected = False
     try:
         client = ledger.events.add_client(websocket, ledger.db, ledger.crud)
     except Exception as e:
@@ -214,11 +215,16 @@ async def websocket_endpoint(websocket: WebSocket):
     try:
         # this will block until the session is closed
         await client.start()
+    except WebSocketDisconnect as e:
+        logger.debug(f"Websocket disconnected: {e}")
+        disconnected = True
+        return
     except Exception as e:
         logger.debug(f"Exception: {e}")
         ledger.events.remove_client(client)
     finally:
-        await asyncio.wait_for(websocket.close(), timeout=1)
+        if not disconnected:
+            await asyncio.wait_for(websocket.close(), timeout=1)
 
 
 @router.post(