add disconnect and trigger for read only db error

cashu/core/db.py

@@ -234,7 +234,12 @@ async def _handle_lock_retry(retry_delay, timeout, start_time) -> float:
             return retry_delay
 
         def _is_lock_exception(e):
-            if "database is locked" in str(e) or "could not obtain lock" in str(e):
+            if (
+                "database is locked" in str(e)
+                or "could not obtain lock" in str(e)
+                or "already locked" in str(e)
+                or "attempt to write a readonly database" in str(e)
+            ):
                 logger.trace(f"Lock exception: {e}")
                 return True
 

cashu/mint/app.py

@@ -12,6 +12,7 @@
 from ..core.settings import settings
 from .router import router
 from .router_deprecated import router_deprecated
+from .startup import shutdown_mint as shutdown_mint_init
 from .startup import start_mint_init
 
 if settings.debug_profiling:
@@ -103,3 +104,8 @@ async def catch_exceptions(request: Request, call_next):
 @app.on_event("startup")
 async def startup_mint():
     await start_mint_init()
+
+
+@app.on_event("shutdown")
+async def shutdown_mint():
+    await shutdown_mint_init()

cashu/mint/startup.py

@@ -98,3 +98,8 @@ async def start_mint_init():
     await ledger.startup_ledger()
     logger.info("Mint started.")
     # asyncio.create_task(rotate_keys())
+
+
+async def shutdown_mint():
+    if ledger.db._connection:
+        await ledger.db._connection.close()