Falling back to ZAPI when rest calls are not be enabled on ONTAP

storage_drivers/ontap/ontap_common.go

@@ -1101,7 +1101,26 @@ func InitializeOntapAPI(
  // Based on user-configured options, we either keep the REST client or override it with a ZAPI client.
  ontapAPI, err = api.NewRestClientFromOntapConfig(ctx, config)
  if err != nil {
- return nil, fmt.Errorf("error creating ONTAP API client: %v", err)
+ // The creation of a REST client may fail due to various reasons.
+ // One of the primary reasons could be the lack of authorization for the REST client.
+ // In such cases, we attempt to fall back to ZAPI.
+
+ Logc(ctx).WithField("error", err).Error("Error creating ONTAP REST API client for initial call. Falling back to ZAPI.")
+
+ // If the user has set the useREST flag to true, return an error.
+ if config.UseREST != nil && *config.UseREST == true {
+ Logc(ctx).Error("useREST is set to true. Returning error, instead of falling back to ZAPI.")
+ return nil, fmt.Errorf("error creating ONTAP REST API client: %v", err)
+ }
+
+ ontapAPI, err = api.NewZAPIClientFromOntapConfig(ctx, config, numRecords)
+ if err != nil {
+ return nil, fmt.Errorf("error creating ONTAP API client: %v", err)
+ }
+
+ Logc(ctx).WithField("Backend", config.BackendName).Info("Using ZAPI client")
+ Logc(ctx).WithField("SVM", ontapAPI.SVMName()).Debug("Using SVM.")
+ return ontapAPI, nil
  }
 
  ontapVer, err := ontapAPI.APIVersion(ctx)