fix: issue 603 [Unexpected error when registering a gateway with the same name.] (#607)

* fix: show proper error on gateway register and added hot reload in gunicorn

* Remove hot reload from run-gunicorn

Signed-off-by: Mihai Criveti <[email protected]>

---------

Signed-off-by: Mihai Criveti <[email protected]>
Co-authored-by: Mihai Criveti <[email protected]>

Author: kumar-tiger

mcpgateway/main.py

@@ -93,7 +93,7 @@
     ToolUpdate,
 )
 from mcpgateway.services.completion_service import CompletionService
-from mcpgateway.services.gateway_service import GatewayConnectionError, GatewayService
+from mcpgateway.services.gateway_service import GatewayConnectionError, GatewayService, GatewayNameConflictError
 from mcpgateway.services.logging_service import LoggingService
 from mcpgateway.services.prompt_service import (
     PromptError,
@@ -1808,6 +1808,8 @@ async def register_gateway(
             return JSONResponse(content={"message": "Unable to connect to gateway"}, status_code=502)
         if isinstance(ex, ValueError):
             return JSONResponse(content={"message": "Unable to process input"}, status_code=400)
+        if isinstance(ex, GatewayNameConflictError):
+            return JSONResponse(content={"message": "Gateway name already exists"}, status_code=400)
         if isinstance(ex, RuntimeError):
             return JSONResponse(content={"message": "Error during execution"}, status_code=500)
         return JSONResponse(content={"message": "Unexpected error"}, status_code=500)

mcpgateway/services/gateway_service.py

@@ -392,6 +392,11 @@ async def register_gateway(self, db: Session, gateway: GatewayCreate) -> Gateway
                 ge: ExceptionGroup[GatewayConnectionError]
             logger.error(f"GatewayConnectionError in group: {ge.exceptions}")
             raise ge.exceptions[0]
+        except* GatewayNameConflictError as gnce:
+            if TYPE_CHECKING:
+                gnce: ExceptionGroup[GatewayNameConflictError]
+            logger.error(f"GatewayNameConflictError in group: {gnce.exceptions}")
+            raise gnce.exceptions[0]
         except* ValueError as ve:
             if TYPE_CHECKING:
                 ve: ExceptionGroup[ValueError]