googleapis/mcp-toolbox · error

failed to get operations client: %w

Error message

failed to get operations client: %w

What it means

GetOperationsClient, which normally just returns the pre-initialized s.OpsClient, returned an error inside CancelOperation; this is a defensive guard since the current implementation always returns nil error — failure here means the stored client is unusable.

Source

Thrown at internal/sources/serverlessspark/serverlessspark.go:162

func (s *Source) GetSessionControllerClient() *dataproc.SessionControllerClient {
	return s.SessionClient
}

func (s *Source) GetOperationsClient(ctx context.Context) (*longrunning.OperationsClient, error) {
	return s.OpsClient, nil
}

func (s *Source) Close() error {
	return errors.Join(s.BatchClient.Close(), s.SessionClient.Close(), s.SessionTemplateClient.Close(), s.OpsClient.Close())
}

func (s *Source) CancelOperation(ctx context.Context, operation string) (any, error) {
	req := &longrunningpb.CancelOperationRequest{
		Name: fmt.Sprintf("projects/%s/locations/%s/operations/%s", s.GetProject(), s.GetLocation(), operation),
	}
	client, err := s.GetOperationsClient(ctx)
	if err != nil {
		return nil, fmt.Errorf("failed to get operations client: %w", err)
	}
	err = client.CancelOperation(ctx, req)
	if err != nil {
		return nil, fmt.Errorf("failed to cancel operation: %w", err)
	}
	return fmt.Sprintf("Cancelled [%s].", operation), nil
}

func (s *Source) CreateBatch(ctx context.Context, batch *dataprocpb.Batch) (map[string]any, error) {
	req := &dataprocpb.CreateBatchRequest{
		Parent: fmt.Sprintf("projects/%s/locations/%s", s.GetProject(), s.GetLocation()),
		Batch:  batch,
	}

	client := s.GetBatchControllerClient()
	op, err := client.CreateBatch(ctx, req)
	if err != nil {
		return nil, fmt.Errorf("failed to create batch: %w", err)

View on GitHub (pinned to 8cc6e09de2)

Solutions

1. Check whether the source was fully initialized (all clients created in Initialize)
2. Recreate/reinitialize the Serverless Spark source if its clients were closed
3. Inspect the wrapped error for the underlying Google API cause

When it happens

Trigger: Thrown at internal/sources/serverlessspark/serverlessspark.go:162 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of googleapis/mcp-toolbox@8cc6e09de2 (2026-09-05). Data as JSON: /api/errors/ecf773100485482d. Report an issue: GitHub.