CloudWatch Logs: Queries in an expression should run synchronously (#64443)

pkg/expr/nodes.go

@@ -21,6 +21,8 @@ var (
 	logger = log.New("expr")
 )
 
+const FromExpressionHeaderName = "FromExpression"
+
 type QueryError struct {
 	RefID string
 	Err   error
@@ -227,6 +229,7 @@ func (dn *DSNode) Execute(ctx context.Context, now time.Time, _ mathexp.Vars, s
 		},
 		Headers: dn.request.Headers,
 	}
+	req.Headers[FromExpressionHeaderName] = "true"
 
 	responseType := "unknown"
 	defer func() {

pkg/tsdb/cloudwatch/cloudwatch.go

@@ -20,6 +20,7 @@ import (
 	"github.com/grafana/grafana-plugin-sdk-go/backend/datasource"
 	"github.com/grafana/grafana-plugin-sdk-go/backend/instancemgmt"
 	"github.com/grafana/grafana-plugin-sdk-go/backend/resource/httpadapter"
+	"github.com/grafana/grafana/pkg/expr"
 	"github.com/grafana/grafana/pkg/infra/httpclient"
 	"github.com/grafana/grafana/pkg/infra/log"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
@@ -155,7 +156,7 @@ func (e *cloudWatchExecutor) QueryData(ctx context.Context, req *backend.QueryDa
 		to the query, but rather an ID is first returned. Following this, a client is expected to send requests along
 		with the ID until the status of the query is complete, receiving (possibly partial) results each time. For
 		queries made via dashboards and Explore, the logic of making these repeated queries is handled on the
-		frontend, but because alerts are executed on the backend the logic needs to be reimplemented here.
+		frontend, but because alerts and expressions are executed on the backend the logic needs to be reimplemented here.
 	*/
 	q := req.Queries[0]
 	var model DataQueryJson
@@ -163,11 +164,12 @@ func (e *cloudWatchExecutor) QueryData(ctx context.Context, req *backend.QueryDa
 	if err != nil {
 		return nil, err
 	}
-	_, fromAlert := req.Headers[ngalertmodels.FromAlertHeaderName]
-	isLogAlertQuery := fromAlert && model.QueryMode == logsQueryMode
 
-	if isLogAlertQuery {
-		return e.executeLogAlertQuery(ctx, req)
+	_, fromAlert := req.Headers[ngalertmodels.FromAlertHeaderName]
+	_, fromExpression := req.Headers[expr.FromExpressionHeaderName]
+	isSyncLogQuery := (fromAlert || fromExpression) && model.QueryMode == logsQueryMode
+	if isSyncLogQuery {
+		return executeSyncLogQuery(ctx, e, req)
 	}
 
 	var result *backend.QueryDataResponse

pkg/tsdb/cloudwatch/cloudwatch_test.go

@@ -17,6 +17,7 @@ import (
 	"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/grafana/grafana/pkg/expr"
 	"github.com/grafana/grafana/pkg/infra/httpclient"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	ngalertmodels "github.com/grafana/grafana/pkg/services/ngalert/models"
@@ -192,7 +193,7 @@ func Test_CheckHealth(t *testing.T) {
 		}, resp)
 	})
 }
-func Test_executeLogAlertQuery(t *testing.T) {
+func Test_executeSyncLogQuery(t *testing.T) {
 	origNewCWClient := NewCWClient
 	t.Cleanup(func() {
 		NewCWClient = origNewCWClient
@@ -254,6 +255,70 @@ func Test_executeLogAlertQuery(t *testing.T) {
 		assert.NoError(t, err)
 		assert.Equal(t, []string{"instance manager's region"}, sess.calledRegions)
 	})
+
+	t.Run("with header", func(t *testing.T) {
+		testcases := []struct {
+			name    string
+			headers map[string]string
+			called  bool
+		}{
+			{
+				"alert header",
+				map[string]string{ngalertmodels.FromAlertHeaderName: "some value"},
+				true,
+			},
+			{
+				"expression header",
+				map[string]string{expr.FromExpressionHeaderName: "some value"},
+				true,
+			},
+			{
+				"no header",
+				map[string]string{},
+				false,
+			},
+		}
+		origExecuteSyncLogQuery := executeSyncLogQuery
+		var syncCalled bool
+		executeSyncLogQuery = func(ctx context.Context, e *cloudWatchExecutor, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error) {
+			syncCalled = true
+			return nil, nil
+		}
+
+		for _, tc := range testcases {
+			t.Run(tc.name, func(t *testing.T) {
+				syncCalled = false
+				cli = fakeCWLogsClient{queryResults: cloudwatchlogs.GetQueryResultsOutput{Status: aws.String("Complete")}}
+				im := datasource.NewInstanceManager(func(s backend.DataSourceInstanceSettings) (instancemgmt.Instance, error) {
+					return DataSource{Settings: models.CloudWatchSettings{AWSDatasourceSettings: awsds.AWSDatasourceSettings{Region: "instance manager's region"}}}, nil
+				})
+				sess := fakeSessionCache{}
+
+				executor := newExecutor(im, newTestConfig(), &sess, featuremgmt.WithFeatures())
+				_, err := executor.QueryData(context.Background(), &backend.QueryDataRequest{
+					Headers:       tc.headers,
+					PluginContext: backend.PluginContext{DataSourceInstanceSettings: &backend.DataSourceInstanceSettings{}},
+					Queries: []backend.DataQuery{
+						{
+							TimeRange: backend.TimeRange{From: time.Unix(0, 0), To: time.Unix(1, 0)},
+							JSON: json.RawMessage(`{
+								"queryMode":    "Logs",
+								"type":        "logAction",
+								"subtype":     "StartQuery",
+								"region":      "default",
+								"queryString": "fields @message"
+							}`),
+						},
+					},
+				})
+
+				assert.NoError(t, err)
+				assert.Equal(t, tc.called, syncCalled)
+			})
+		}
+
+		executeSyncLogQuery = origExecuteSyncLogQuery
+	})
 }
 
 func TestQuery_ResourceRequest_DescribeLogGroups_with_CrossAccountQuerying(t *testing.T) {

pkg/tsdb/cloudwatch/log_sync_query.go

@@ -18,7 +18,7 @@ const (
 	alertPollPeriod  = time.Second
 )
 
-func (e *cloudWatchExecutor) executeLogAlertQuery(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error) {
+var executeSyncLogQuery = func(ctx context.Context, e *cloudWatchExecutor, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error) {
 	resp := backend.NewQueryDataResponse()
 
 	for _, q := range req.Queries {
@@ -45,7 +45,7 @@ func (e *cloudWatchExecutor) executeLogAlertQuery(ctx context.Context, req *back
 			return nil, err
 		}
 
-		getQueryResultsOutput, err := e.alertQuery(ctx, logsClient, q, logsQuery)
+		getQueryResultsOutput, err := e.syncQuery(ctx, logsClient, q, logsQuery)
 		if err != nil {
 			return nil, err
 		}
@@ -73,7 +73,7 @@ func (e *cloudWatchExecutor) executeLogAlertQuery(ctx context.Context, req *back
 	return resp, nil
 }
 
-func (e *cloudWatchExecutor) alertQuery(ctx context.Context, logsClient cloudwatchlogsiface.CloudWatchLogsAPI,
+func (e *cloudWatchExecutor) syncQuery(ctx context.Context, logsClient cloudwatchlogsiface.CloudWatchLogsAPI,
 	queryContext backend.DataQuery, logsQuery models.LogsQuery) (*cloudwatchlogs.GetQueryResultsOutput, error) {
 	startQueryOutput, err := e.executeStartQuery(ctx, logsClient, logsQuery, queryContext.TimeRange)
 	if err != nil {