Add support to get connection data from Trigger Authorization in MySQL Scaler

CHANGELOG.md

@@ -35,6 +35,7 @@
 - Escape `queueName` and `vhostName` in RabbitMQ Scaler before use them in query string (bug fix) ([#2055](https://github.com/kedacore/keda/pull/2055))
 - TriggerAuthentication/Vault: add support for HashiCorp Vault namespace (Vault Enterprise) ([#2085](https://github.com/kedacore/keda/pull/2085))
 - Add custom http timeout in RabbitMQ Scaler ([#2086](https://github.com/kedacore/keda/pull/2086))
+- Add support to get connection data from Trigger Authorization in MySQL Scaler ([#2113](https://github.com/kedacore/keda/pull/2113))
 
 ### Breaking Changes
 

pkg/scalers/mysql_scaler.go

@@ -78,26 +78,25 @@ func parseMySQLMetadata(config *ScalerConfig) (*mySQLMetadata, error) {
 		meta.connectionString = config.ResolvedEnv[config.TriggerMetadata["connectionStringFromEnv"]]
 	default:
 		meta.connectionString = ""
-		if val, ok := config.TriggerMetadata["host"]; ok {
-			meta.host = val
-		} else {
-			return nil, fmt.Errorf("no host given")
+		var err error
+		meta.host, err = getFromAuthOrMeta(config, "host")
+		if err != nil {
+			return nil, err
 		}
-		if val, ok := config.TriggerMetadata["port"]; ok {
-			meta.port = val
-		} else {
-			return nil, fmt.Errorf("no port given")
+
+		meta.port, err = getFromAuthOrMeta(config, "port")
+		if err != nil {
+			return nil, err
 		}
 
-		if val, ok := config.TriggerMetadata["username"]; ok {
-			meta.username = val
-		} else {
-			return nil, fmt.Errorf("no username given")
+		meta.username, err = getFromAuthOrMeta(config, "username")
+		if err != nil {
+			return nil, err
 		}
-		if val, ok := config.TriggerMetadata["dbName"]; ok {
-			meta.dbName = val
-		} else {
-			return nil, fmt.Errorf("no dbName given")
+
+		meta.dbName, err = getFromAuthOrMeta(config, "dbName")
+		if err != nil {
+			return nil, err
 		}
 
 		if config.AuthParams["password"] != "" {
@@ -219,3 +218,17 @@ func (s *mySQLScaler) GetMetrics(ctx context.Context, metricName string, metricS
 
 	return append([]external_metrics.ExternalMetricValue{}, metric), nil
 }
+
+func getFromAuthOrMeta(config *ScalerConfig, field string) (string, error) {
+	var result string
+	var err error
+	if config.AuthParams[field] != "" {
+		result = config.AuthParams[field]
+	} else if config.TriggerMetadata[field] != "" {
+		result = config.TriggerMetadata[field]
+	}
+	if result == "" {
+		err = fmt.Errorf("no %s given", field)
+	}
+	return result, err
+}

pkg/scalers/mysql_scaler_test.go

@@ -12,6 +12,7 @@ var testMySQLResolvedEnv = map[string]string{
 type parseMySQLMetadataTestData struct {
 	metadata    map[string]string
 	resolvedEnv map[string]string
+	authParams  map[string]string
 	raisesError bool
 }
 
@@ -24,18 +25,28 @@ var testMySQLMetadata = []parseMySQLMetadataTestData{
 	// No metadata
 	{
 		metadata:    map[string]string{},
+		authParams:  map[string]string{},
 		resolvedEnv: testMySQLResolvedEnv,
 		raisesError: true,
 	},
 	// connectionString
 	{
 		metadata:    map[string]string{"query": "query", "queryValue": "12", "connectionStringFromEnv": "MYSQL_CONN_STR"},
+		authParams:  map[string]string{},
 		resolvedEnv: testMySQLResolvedEnv,
 		raisesError: false,
 	},
 	// Params instead of conn str
 	{
 		metadata:    map[string]string{"query": "query", "queryValue": "12", "host": "test_host", "port": "test_port", "username": "test_username", "passwordFromEnv": "MYSQL_PASSWORD", "dbName": "test_dbname"},
+		authParams:  map[string]string{},
+		resolvedEnv: testMySQLResolvedEnv,
+		raisesError: false,
+	},
+	// Params from trigger authentication
+	{
+		metadata:    map[string]string{"query": "query", "queryValue": "12"},
+		authParams:  map[string]string{"host": "test_host", "port": "test_port", "username": "test_username", "password": "MYSQL_PASSWORD", "dbName": "test_dbname"},
 		resolvedEnv: testMySQLResolvedEnv,
 		raisesError: false,
 	},
@@ -48,7 +59,7 @@ var mySQLMetricIdentifiers = []mySQLMetricIdentifier{
 
 func TestParseMySQLMetadata(t *testing.T) {
 	for _, testData := range testMySQLMetadata {
-		_, err := parseMySQLMetadata(&ScalerConfig{ResolvedEnv: testMySQLResolvedEnv, TriggerMetadata: testData.metadata, AuthParams: map[string]string{}})
+		_, err := parseMySQLMetadata(&ScalerConfig{ResolvedEnv: testMySQLResolvedEnv, TriggerMetadata: testData.metadata, AuthParams: testData.authParams})
 		if err != nil && !testData.raisesError {
 			t.Error("Expected success but got error", err)
 		}