Cloudwatch: Fix duplicated time series (#35433)

* make sure queries are only ran once

* test aliases

* use correct dates

pkg/tsdb/cloudwatch/request_parser.go

@@ -15,9 +15,9 @@ import (
 )
 
 // Parses the json queries and returns a requestQuery. The requestQuery has a 1 to 1 mapping to a query editor row
-func (e *cloudWatchExecutor) parseQueries(req *backend.QueryDataRequest, startTime time.Time, endTime time.Time) (map[string][]*requestQuery, error) {
+func (e *cloudWatchExecutor) parseQueries(queries []backend.DataQuery, startTime time.Time, endTime time.Time) (map[string][]*requestQuery, error) {
 	requestQueries := make(map[string][]*requestQuery)
-	for _, query := range req.Queries {
+	for _, query := range queries {
 		model, err := simplejson.NewJson(query.JSON)
 		if err != nil {
 			return nil, &queryError{err: err, RefID: query.RefID}

pkg/tsdb/cloudwatch/test_utils.go

@@ -51,12 +51,17 @@ func (m FakeCWLogsClient) GetLogGroupFieldsWithContext(ctx context.Context, inpu
 
 type FakeCWClient struct {
 	cloudwatchiface.CloudWatchAPI
+	cloudwatch.GetMetricDataOutput
 
 	Metrics []*cloudwatch.Metric
 
 	MetricsPerPage int
 }
 
+func (c FakeCWClient) GetMetricDataWithContext(aws.Context, *cloudwatch.GetMetricDataInput, ...request.Option) (*cloudwatch.GetMetricDataOutput, error) {
+	return &c.GetMetricDataOutput, nil
+}
+
 func (c FakeCWClient) ListMetricsPages(input *cloudwatch.ListMetricsInput, fn func(*cloudwatch.ListMetricsOutput, bool) bool) error {
 	if c.MetricsPerPage == 0 {
 		c.MetricsPerPage = 1000

pkg/tsdb/cloudwatch/time_series_query.go

@@ -5,24 +5,31 @@ import (
 	"fmt"
 
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
-	"github.com/grafana/grafana-plugin-sdk-go/data"
 	"github.com/grafana/grafana/pkg/infra/log"
 	"golang.org/x/sync/errgroup"
 )
 
+type responseWrapper struct {
+	DataResponse *backend.DataResponse
+	RefId        string
+}
+
 func (e *cloudWatchExecutor) executeTimeSeriesQuery(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error) {
 	plog.Debug("Executing time series query")
-
 	resp := backend.NewQueryDataResponse()
 
-	for _, q := range req.Queries {
-		startTime := q.TimeRange.From
-		endTime := q.TimeRange.To
+	if len(req.Queries) == 0 {
+		return nil, fmt.Errorf("request contains no queries")
+	}
+
+	// startTime and endTime are always the same for all queries
+	startTime := req.Queries[0].TimeRange.From
+	endTime := req.Queries[0].TimeRange.To
 	if !startTime.Before(endTime) {
 		return nil, fmt.Errorf("invalid time range: start time must be before end time")
 	}
 
-		requestQueriesByRegion, err := e.parseQueries(req, startTime, endTime)
+	requestQueriesByRegion, err := e.parseQueries(req.Queries, startTime, endTime)
 	if err != nil {
 		return nil, err
 	}
@@ -31,7 +38,7 @@ func (e *cloudWatchExecutor) executeTimeSeriesQuery(ctx context.Context, req *ba
 		return backend.NewQueryDataResponse(), nil
 	}
 
-		resultChan := make(chan *backend.DataResponse, len(req.Queries))
+	resultChan := make(chan *responseWrapper, len(req.Queries))
 	eg, ectx := errgroup.WithContext(ctx)
 	for r, q := range requestQueriesByRegion {
 		requestQueries := q
@@ -41,8 +48,10 @@ func (e *cloudWatchExecutor) executeTimeSeriesQuery(ctx context.Context, req *ba
 				if err := recover(); err != nil {
 					plog.Error("Execute Get Metric Data Query Panic", "error", err, "stack", log.Stack(1))
 					if theErr, ok := err.(error); ok {
-							resultChan <- &backend.DataResponse{
+						resultChan <- &responseWrapper{
+							DataResponse: &backend.DataResponse{
 								Error: theErr,
+							},
 						}
 					}
 				}
@@ -55,13 +64,7 @@ func (e *cloudWatchExecutor) executeTimeSeriesQuery(ctx context.Context, req *ba
 
 			queries, err := e.transformRequestQueriesToCloudWatchQueries(requestQueries)
 			if err != nil {
-					for _, query := range requestQueries {
-						resultChan <- &backend.DataResponse{
-							Frames: data.Frames{data.NewFrame(query.RefId)},
-							Error:  err,
-						}
-					}
-					return nil
+				return err
 			}
 
 			metricDataInput, err := e.buildMetricDataInput(startTime, endTime, queries)
@@ -69,43 +72,26 @@ func (e *cloudWatchExecutor) executeTimeSeriesQuery(ctx context.Context, req *ba
 				return err
 			}
 
-				cloudwatchResponses := make([]*cloudwatchResponse, 0)
 			mdo, err := e.executeRequest(ectx, client, metricDataInput)
 			if err != nil {
-					for _, query := range requestQueries {
-						resultChan <- &backend.DataResponse{
-							Frames: data.Frames{data.NewFrame(query.RefId)},
-							Error:  err,
-						}
-					}
-					return nil
+				return err
 			}
 
 			responses, err := e.parseResponse(mdo, queries)
 			if err != nil {
-					for _, query := range requestQueries {
-						resultChan <- &backend.DataResponse{
-							Frames: data.Frames{data.NewFrame(query.RefId)},
-							Error:  err,
-						}
-					}
-					return nil
+				return err
 			}
 
-				cloudwatchResponses = append(cloudwatchResponses, responses...)
-				res, err := e.transformQueryResponsesToQueryResult(cloudwatchResponses, requestQueries, startTime, endTime)
+			res, err := e.transformQueryResponsesToQueryResult(responses, requestQueries, startTime, endTime)
 			if err != nil {
-					for _, query := range requestQueries {
-						resultChan <- &backend.DataResponse{
-							Frames: data.Frames{data.NewFrame(query.RefId)},
-							Error:  err,
-						}
-					}
-					return nil
+				return err
 			}
 
-				for _, queryRes := range res {
-					resultChan <- queryRes
+			for refID, queryRes := range res {
+				resultChan <- &responseWrapper{
+					DataResponse: queryRes,
+					RefId:        refID,
+				}
 			}
 			return nil
 		})
@@ -117,8 +103,7 @@ func (e *cloudWatchExecutor) executeTimeSeriesQuery(ctx context.Context, req *ba
 	close(resultChan)
 
 	for result := range resultChan {
-			resp.Responses[q.RefID] = *result
-		}
+		resp.Responses[result.RefId] = *result.DataResponse
 	}
 
 	return resp, nil

pkg/tsdb/cloudwatch/time_series_query_test.go

@@ -2,18 +2,124 @@ package cloudwatch
 
 import (
 	"context"
+	"encoding/json"
 	"testing"
 	"time"
 
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/cloudwatch"
+	"github.com/aws/aws-sdk-go/service/cloudwatch/cloudwatchiface"
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/grafana/grafana-plugin-sdk-go/backend/datasource"
+	"github.com/grafana/grafana-plugin-sdk-go/backend/instancemgmt"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestTimeSeriesQuery(t *testing.T) {
 	executor := newExecutor(nil, nil, newTestConfig(), fakeSessionCache{})
 	now := time.Now()
 
+	origNewCWClient := NewCWClient
+	t.Cleanup(func() {
+		NewCWClient = origNewCWClient
+	})
+
+	var cwClient FakeCWClient
+
+	NewCWClient = func(sess *session.Session) cloudwatchiface.CloudWatchAPI {
+		return cwClient
+	}
+
+	t.Run("Custom metrics", func(t *testing.T) {
+		cwClient = FakeCWClient{
+			CloudWatchAPI: nil,
+			GetMetricDataOutput: cloudwatch.GetMetricDataOutput{
+				NextToken: nil,
+				Messages:  []*cloudwatch.MessageData{},
+				MetricDataResults: []*cloudwatch.MetricDataResult{
+					{
+						StatusCode: aws.String("Complete"), Id: aws.String("a"), Label: aws.String("NetworkOut"), Values: []*float64{aws.Float64(1.0)}, Timestamps: []*time.Time{&now},
+					},
+					{
+						StatusCode: aws.String("Complete"), Id: aws.String("b"), Label: aws.String("NetworkIn"), Values: []*float64{aws.Float64(1.0)}, Timestamps: []*time.Time{&now},
+					},
+				},
+			},
+		}
+
+		im := datasource.NewInstanceManager(func(s backend.DataSourceInstanceSettings) (instancemgmt.Instance, error) {
+			return datasourceInfo{}, nil
+		})
+
+		executor := newExecutor(nil, im, newTestConfig(), fakeSessionCache{})
+		resp, err := executor.QueryData(context.Background(), &backend.QueryDataRequest{
+			PluginContext: backend.PluginContext{
+				DataSourceInstanceSettings: &backend.DataSourceInstanceSettings{},
+			},
+			Queries: []backend.DataQuery{
+				{
+					RefID: "A",
+					TimeRange: backend.TimeRange{
+						From: now.Add(time.Hour * -2),
+						To:   now.Add(time.Hour * -1),
+					},
+					JSON: json.RawMessage(`{
+						"type":      "timeSeriesQuery",
+						"subtype":   "metrics",
+						"namespace": "AWS/EC2",
+						"metricName": "NetworkOut",
+						"expression": "",
+						"dimensions": {
+						  "InstanceId": "i-00645d91ed77d87ac"
+						},
+						"region": "us-east-2",
+						"id": "a",
+						"alias": "NetworkOut",
+						"statistics": [
+						  "Maximum"
+						],
+						"period": "300",
+						"hide": false,
+						"matchExact": true,
+						"refId": "A"
+					}`),
+				},
+				{
+					RefID: "B",
+					TimeRange: backend.TimeRange{
+						From: now.Add(time.Hour * -2),
+						To:   now.Add(time.Hour * -1),
+					},
+					JSON: json.RawMessage(`{
+						"type":      "timeSeriesQuery",
+						"subtype":   "metrics",
+						"namespace": "AWS/EC2",
+						"metricName": "NetworkIn",
+						"expression": "",
+						"dimensions": {
+						"InstanceId": "i-00645d91ed77d87ac"
+						},
+						"region": "us-east-2",
+						"id": "b",
+						"alias": "NetworkIn",
+						"statistics": [
+						"Maximum"
+						],
+						"period": "300",
+						"matchExact": true,
+						"refId": "B"
+					}`),
+				},
+			},
+		})
+		require.NoError(t, err)
+		assert.Equal(t, "NetworkOut", resp.Responses["A"].Frames[0].Name)
+		assert.Equal(t, "NetworkIn", resp.Responses["B"].Frames[0].Name)
+	})
+
 	t.Run("End time before start time should result in error", func(t *testing.T) {
 		_, err := executor.executeTimeSeriesQuery(context.TODO(), &backend.QueryDataRequest{Queries: []backend.DataQuery{{TimeRange: backend.TimeRange{
 			From: now.Add(time.Hour * -1),