[3.1] fix: metadata port reuse

config/application_config.go

@@ -37,8 +37,9 @@ type ApplicationConfig struct {
 	Owner        string `default:"dubbo-go" yaml:"owner" json:"owner,omitempty" property:"owner"`
 	Environment  string `yaml:"environment" json:"environment,omitempty" property:"environment"`
 	// the metadata type. remote or local
-	MetadataType string `default:"local" yaml:"metadata-type" json:"metadataType,omitempty" property:"metadataType"`
-	Tag          string `yaml:"tag" json:"tag,omitempty" property:"tag"`
+	MetadataType        string `default:"local" yaml:"metadata-type" json:"metadataType,omitempty" property:"metadataType"`
+	Tag                 string `yaml:"tag" json:"tag,omitempty" property:"tag"`
+	MetadataServicePort string `yaml:"metadata-service-port" json:"metadata-service-port,omitempty" property:"metadata-service-port"`
 }
 
 // Prefix dubbo.application

metadata/service/exporter/configurable/exporter.go

@@ -26,6 +26,7 @@ import (
 )
 
 import (
+	"dubbo.apache.org/dubbo-go/v3"
 	"dubbo.apache.org/dubbo-go/v3/common"
 	"dubbo.apache.org/dubbo-go/v3/common/constant"
 	"dubbo.apache.org/dubbo-go/v3/common/extension"
@@ -65,7 +66,7 @@ func (exporter *MetadataServiceExporter) Export(url *common.URL) error {
 			SetServiceID(constant.SimpleMetadataServiceName).
 			SetProtocolIDs(constant.DefaultProtocol).
 			AddRCProtocol(constant.DefaultProtocol, config.NewProtocolConfigBuilder().
-				SetName(constant.DefaultProtocol).
+				SetName(constant.DefaultProtocol).SetPort(getMetadataPort()).
 				Build()).
 			SetRegistryIDs("N/A").
 			SetInterface(constant.MetadataServiceName).
@@ -84,6 +85,22 @@ func (exporter *MetadataServiceExporter) Export(url *common.URL) error {
 	return nil
 }
 
+func getMetadataPort() string {
+	rootConfig := config.GetRootConfig()
+	port := rootConfig.Application.MetadataServicePort
+	if port == "" {
+		protocolConfig, ok := rootConfig.Protocols[constant.DefaultProtocol]
+		if ok {
+			port = protocolConfig.Port
+		} else {
+			logger.Warnf("[Metadata Service] Dubbo-go %s version's MetadataService does not support triple protocol,"+
+				"MetadataService will use random port",
+				dubbo.Version)
+		}
+	}
+	return port
+}
+
 // Unexport will unexport the metadataService
 func (exporter *MetadataServiceExporter) Unexport() {
 	if exporter.IsExported() {

version.go

@@ -0,0 +1,21 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package dubbo
+
+// dubbo-go version
+const Version = "3.1.1"