googleapis/mcp-toolbox · error

failed to list data assets: %w

Error message

failed to list data assets: %w

What it means

Fallback branch of the ListDataAssets error path: the iterator returned an error with no gRPC status, so the library wraps the raw cause with %w. This points to a client-side or transport problem instead of an API-reported status.

Source

Thrown at internal/sources/dataplex/dataplex.go:580

		Parent:   parent,
		Filter:   filter,
		PageSize: int32(pageSize),
		OrderBy:  orderBy,
	}

	it := s.GetDataProductClient().ListDataAssets(ctx, req)
	var results []*DataAsset

	for len(results) < pageSize {
		asset, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			if st, ok := grpcstatus.FromError(err); ok {
				return nil, fmt.Errorf("failed to list data assets: code=%s message=%s", st.Code(), st.Message())
			}
			return nil, fmt.Errorf("failed to list data assets: %w", err)
		}
		parts := strings.Split(asset.GetName(), "/")
		var locID, prodID, assetID string
		if len(parts) >= 8 && parts[0] == "projects" && parts[2] == "locations" && parts[4] == "dataProducts" && parts[6] == "dataAssets" {
			locID = parts[3]
			prodID = parts[5]
			assetID = parts[7]
		}
		results = append(results, &DataAsset{
			LocationID:    locID,
			DataProductID: prodID,
			DataAssetID:   assetID,
			ResourceURI:   asset.GetResource(),
			Labels:        asset.GetLabels(),
		})
	}
	return results, nil
}

View on GitHub (pinned to 8cc6e09de2)

Solutions

1. Unwrap the error to identify the root cause.
2. Increase the context timeout or pass a fresh context for pagination.
3. Retry with backoff for transient network issues.
4. Confirm credentials/token refresh works (gcloud auth application-default login).

Example fix

// before
assets, err := src.ListDataAssets(ctx, ...) // ctx nearly expired
// after
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
defer cancel()
assets, err := src.ListDataAssets(ctx, ...)

if err := ctx.Err(); err != nil { return nil, fmt.Errorf("context already done: %w", err) }

var assets []*DataAsset
err := retry.Do(func() error {
	var e error
	assets, e = src.ListDataAssets(ctx, locID, prodID, filter, pageSize, orderBy)
	return e
}, retry.Attempts(3), retry.DelayType(retry.BackOffDelay))

When it happens

Trigger: Non-gRPC errors from iterator.Next() while paging data assets: context cancellation or deadline exceeded, dropped connections, or client/serialization errors.

Common situations: Request handler context expiring during long pagination; unstable network or proxy; transient token refresh failures surfaced as plain errors.

Related errors

• failed to list data scans: %w
• failed to list data products: %w
• failed to create Dataplex client for project %q: %w
• failed to list tables: %w
• failed to create Dataplex client for project %q: %w

AI-assisted analysis of googleapis/mcp-toolbox@8cc6e09de2 (2026-09-05). Data as JSON: /api/errors/94a5fc54daeaae3c. Report an issue: GitHub.