move out vm logic out of controller

pkgs/clan-cli/clan_cli/webui/error_handlers.py

@@ -0,0 +1,23 @@
+import logging
+
+from fastapi import Request, status
+from fastapi.encoders import jsonable_encoder
+from fastapi.responses import JSONResponse
+
+from ..errors import ClanError
+
+log = logging.getLogger(__name__)
+
+
+def clan_error_handler(request: Request, exc: ClanError) -> JSONResponse:
+    log.error("ClanError: %s", exc)
+    detail = [
+        {
+            "loc": [],
+            "msg": str(exc),
+        }
+    ]
+    return JSONResponse(
+        status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+        content=jsonable_encoder(dict(detail=detail)),
+    )