BackendPlugin: Change QueryData response format (#23234)

* BackendPlugin: (wip) change response format
goes with https://github.com/grafana/grafana-plugin-sdk-go/pull/109

* fix error mapping in wrapper

* latest of my sdk branch

* latest of my sdk branch

* TransformWrapper fixes

* latest of sdk branch (removes extra meta)

* add metadata in wrappers

* also set error string

* sdk: v0.35.0

pkg/plugins/datasource/wrapper/datasource_plugin_wrapper_v2.go

@@ -2,12 +2,13 @@ package wrapper
 
 import (
 	"context"
+	"fmt"
 	"time"
 
+	"github.com/grafana/grafana/pkg/components/simplejson"
 	"github.com/grafana/grafana/pkg/plugins/backendplugin"
 
 	"github.com/grafana/grafana-plugin-sdk-go/genproto/pluginv2"
-	"github.com/grafana/grafana/pkg/components/simplejson"
 	"github.com/grafana/grafana/pkg/infra/log"
 	"github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/tsdb"
@@ -81,12 +82,24 @@ func (tw *DatasourcePluginWrapperV2) Query(ctx context.Context, ds *models.DataS
 		return nil, err
 	}
 
-	return &tsdb.Response{
-		Results: map[string]*tsdb.QueryResult{
-			"": {
-				Dataframes: pbRes.Frames,
-				Meta:       simplejson.NewFromAny(pbRes.Metadata),
-			},
-		},
-	}, nil
+	tR := &tsdb.Response{
+		Results: make(map[string]*tsdb.QueryResult, len(pbRes.Responses)),
+	}
+
+	for refID, pRes := range pbRes.Responses {
+		qr := &tsdb.QueryResult{
+			RefId:      refID,
+			Dataframes: pRes.Frames,
+		}
+		if len(pRes.JsonMeta) != 0 {
+			qr.Meta = simplejson.NewFromAny(pRes.JsonMeta)
+		}
+		if pRes.Error != "" {
+			qr.Error = fmt.Errorf(pRes.Error)
+			qr.ErrorString = pRes.Error
+		}
+		tR.Results[refID] = qr
+	}
+
+	return tR, nil
 }