feat(aws-sqs): Support for scaling to include delayed messages (kedac…

…ore#4377)

Signed-off-by: Chris Taylor <chris@cronofy.com>

CHANGELOG.md

@@ -49,7 +49,7 @@ To learn more about active deprecations, we recommend checking [GitHub Discussio
 
 ### New
 
-- TODO ([#XXX](https://github.com/kedacore/keda/issues/XXX))
+- **AWS SQS Scaler**: Support for scaling to include delayed messages. [#4377](https://github.com/kedacore/keda/issues/4377)
 
 ### Improvements
 

pkg/scalers/aws_sqs_queue_scaler.go

@@ -21,17 +21,9 @@ const (
 	targetQueueLengthDefault           = 5
 	activationTargetQueueLengthDefault = 0
 	defaultScaleOnInFlight             = true
+	defaultScaleOnDelayed              = false
 )
 
-var awsSqsQueueMetricNamesForScalingInFlight = []string{
-	"ApproximateNumberOfMessages",
-	"ApproximateNumberOfMessagesNotVisible",
-}
-
-var awsSqsQueueMetricNamesForNotScalingInFlight = []string{
-	"ApproximateNumberOfMessages",
-}
-
 type awsSqsQueueScaler struct {
 	metricType v2.MetricTargetType
 	metadata   *awsSqsQueueMetadata
@@ -49,6 +41,7 @@ type awsSqsQueueMetadata struct {
 	awsAuthorization            awsAuthorizationMetadata
 	scalerIndex                 int
 	scaleOnInFlight             bool
+	scaleOnDelayed              bool
 	awsSqsQueueMetricNames      []string
 }
 
@@ -78,6 +71,7 @@ func parseAwsSqsQueueMetadata(config *ScalerConfig, logger logr.Logger) (*awsSqs
 	meta := awsSqsQueueMetadata{}
 	meta.targetQueueLength = defaultTargetQueueLength
 	meta.scaleOnInFlight = defaultScaleOnInFlight
+	meta.scaleOnDelayed = defaultScaleOnDelayed
 
 	if val, ok := config.TriggerMetadata["queueLength"]; ok && val != "" {
 		queueLength, err := strconv.ParseInt(val, 10, 64)
@@ -109,10 +103,22 @@ func parseAwsSqsQueueMetadata(config *ScalerConfig, logger logr.Logger) (*awsSqs
 		}
 	}
 
+	if val, ok := config.TriggerMetadata["scaleOnDelayed"]; ok && val != "" {
+		scaleOnDelayed, err := strconv.ParseBool(val)
+		if err != nil {
+			meta.scaleOnDelayed = defaultScaleOnDelayed
+			logger.Error(err, "Error parsing SQS queue metadata scaleOnDelayed, using default %n", defaultScaleOnDelayed)
+		} else {
+			meta.scaleOnDelayed = scaleOnDelayed
+		}
+	}
+
+	meta.awsSqsQueueMetricNames = []string{"ApproximateNumberOfMessages"}
 	if meta.scaleOnInFlight {
-		meta.awsSqsQueueMetricNames = awsSqsQueueMetricNamesForScalingInFlight
-	} else {
-		meta.awsSqsQueueMetricNames = awsSqsQueueMetricNamesForNotScalingInFlight
+		meta.awsSqsQueueMetricNames = append(meta.awsSqsQueueMetricNames, "ApproximateNumberOfMessagesNotVisible")
+	}
+	if meta.scaleOnDelayed {
+		meta.awsSqsQueueMetricNames = append(meta.awsSqsQueueMetricNames, "ApproximateNumberOfMessagesDelayed")
 	}
 
 	if val, ok := config.TriggerMetadata["queueURL"]; ok && val != "" {

pkg/scalers/aws_sqs_queue_scaler_test.go

@@ -65,6 +65,7 @@ func (m *mockSqs) GetQueueAttributes(input *sqs.GetQueueAttributesInput) (*sqs.G
 			Attributes: map[string]*string{
 				"ApproximateNumberOfMessages":           aws.String("NotInt"),
 				"ApproximateNumberOfMessagesNotVisible": aws.String("NotInt"),
+				"ApproximateNumberOfMessagesDelayed":    aws.String("NotInt"),
 			},
 		}, nil
 	}
@@ -73,6 +74,7 @@ func (m *mockSqs) GetQueueAttributes(input *sqs.GetQueueAttributesInput) (*sqs.G
 		Attributes: map[string]*string{
 			"ApproximateNumberOfMessages":           aws.String("200"),
 			"ApproximateNumberOfMessagesNotVisible": aws.String("100"),
+			"ApproximateNumberOfMessagesDelayed":    aws.String("50"),
 		},
 	}, nil
 }
@@ -326,6 +328,44 @@ var awsSQSGetMetricTestData = []*parseAWSSQSMetadataTestData{
 		testAWSSQSEmptyResolvedEnv,
 		false,
 		"not error with scaleOnInFlight enabled"},
+	{map[string]string{
+		"queueURL":       testAWSSQSProperQueueURL,
+		"queueLength":    "1",
+		"awsRegion":      "eu-west-1",
+		"scaleOnDelayed": "false"},
+		testAWSSQSAuthentication,
+		testAWSSQSEmptyResolvedEnv,
+		false,
+		"not error with scaleOnDelayed disabled"},
+	{map[string]string{
+		"queueURL":       testAWSSQSProperQueueURL,
+		"queueLength":    "1",
+		"awsRegion":      "eu-west-1",
+		"scaleOnDelayed": "true"},
+		testAWSSQSAuthentication,
+		testAWSSQSEmptyResolvedEnv,
+		false,
+		"not error with scaleOnDelayed enabled"},
+	{map[string]string{
+		"queueURL":        testAWSSQSProperQueueURL,
+		"queueLength":     "1",
+		"awsRegion":       "eu-west-1",
+		"scaleOnInFlight": "false",
+		"scaleOnDelayed":  "false"},
+		testAWSSQSAuthentication,
+		testAWSSQSEmptyResolvedEnv,
+		false,
+		"not error with scaledOnInFlight and scaleOnDelayed disabled"},
+	{map[string]string{
+		"queueURL":        testAWSSQSProperQueueURL,
+		"queueLength":     "1",
+		"awsRegion":       "eu-west-1",
+		"scaleOnInFlight": "true",
+		"scaleOnDelayed":  "true"},
+		testAWSSQSAuthentication,
+		testAWSSQSEmptyResolvedEnv,
+		false,
+		"not error with scaledOnInFlight and scaleOnDelayed enabled"},
 	{map[string]string{
 		"queueURL":        testAWSSQSErrorQueueURL,
 		"queueLength":     "1",
@@ -390,9 +430,14 @@ func TestAWSSQSScalerGetMetrics(t *testing.T) {
 		case testAWSSQSBadDataQueueURL:
 			assert.Error(t, err, "expect error because of bad data return from sqs")
 		default:
-			if meta.scaleOnInFlight {
+			switch {
+			case meta.scaleOnInFlight && meta.scaleOnDelayed:
+				assert.EqualValues(t, int64(350.0), value[0].Value.Value())
+			case meta.scaleOnInFlight && !meta.scaleOnDelayed:
 				assert.EqualValues(t, int64(300.0), value[0].Value.Value())
-			} else {
+			case !meta.scaleOnInFlight && meta.scaleOnDelayed:
+				assert.EqualValues(t, int64(250.0), value[0].Value.Value())
+			default:
 				assert.EqualValues(t, int64(200.0), value[0].Value.Value())
 			}
 		}