TSDB: show influxdb error message (#24393)

Closes #21647

Signed-off-by: zhulongcheng <zhulongcheng.dev@gmail.com>

pkg/tsdb/influxdb/response_parser.go

@@ -26,6 +26,9 @@ func (rp *ResponseParser) Parse(response *Response, query *Query) *tsdb.QueryRes
 
 	for _, result := range response.Results {
 		queryRes.Series = append(queryRes.Series, rp.transformRows(result.Series, queryRes, query)...)
+		if result.Err != nil {
+			queryRes.Error = result.Err
+		}
 	}
 
 	return queryRes

pkg/tsdb/influxdb/response_parser_test.go

@@ -2,6 +2,7 @@ package influxdb
 
 import (
 	"encoding/json"
+	"fmt"
 	"testing"
 
 	"github.com/grafana/grafana/pkg/setting"
@@ -172,5 +173,55 @@ func TestInfluxdbResponseParser(t *testing.T) {
 				})
 			})
 		})
+
+		Convey("Response parser with errors", func() {
+			parser := &ResponseParser{}
+
+			cfg := setting.NewCfg()
+			err := cfg.Load(&setting.CommandLineArgs{
+				HomePath: "../../../",
+			})
+			So(err, ShouldBeNil)
+
+			response := &Response{
+				Results: []Result{
+					{
+						Series: []Row{
+							{
+								Name:    "cpu",
+								Columns: []string{"time", "mean", "sum"},
+								Tags:    map[string]string{"datacenter": "America"},
+								Values: [][]interface{}{
+									{json.Number("111"), json.Number("222"), json.Number("333")},
+									{json.Number("111"), json.Number("222"), json.Number("333")},
+									{json.Number("111"), json.Number("null"), json.Number("333")},
+								},
+							},
+						},
+					},
+					{
+						Err: fmt.Errorf("query-timeout limit exceeded"),
+					},
+				},
+			}
+
+			query := &Query{}
+
+			result := parser.Parse(response, query)
+
+			Convey("can parse all series", func() {
+				So(len(result.Series), ShouldEqual, 2)
+			})
+
+			Convey("can parse all points", func() {
+				So(len(result.Series[0].Points), ShouldEqual, 3)
+				So(len(result.Series[1].Points), ShouldEqual, 3)
+			})
+
+			Convey("can parse errors ", func() {
+				So(result.Error, ShouldNotBeNil)
+				So(result.Error.Error(), ShouldEqual, "query-timeout limit exceeded")
+			})
+		})
 	})
 }