feat(‎contrib/registry/nacos): add SetDefaultEndpoint and SetDefaultMetadata methods (gogf#4608)

Add configurable default endpoint and metadata support to nacos
Registry,
providing a more flexible alternative to hardcoded environment variable
reads.

- Add defaultEndpoint and defaultMetadata fields to Registry struct
- Add SetDefaultEndpoint method to override service endpoints
- Add SetDefaultMetadata method to merge extra metadata
- Update Register method to use configured defaults

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: houseme <housemecn@gmail.com>

Author: 3 people

contrib/registry/nacos/nacos.go

@@ -34,9 +34,11 @@ var (
 
 // Registry is nacos registry.
 type Registry struct {
-	client      naming_client.INamingClient
-	clusterName string
-	groupName   string
+	client          naming_client.INamingClient
+	clusterName     string
+	groupName       string
+	defaultEndpoint string
+	defaultMetadata map[string]string
 }
 
 // Config is the configuration object for nacos client.
@@ -101,9 +103,10 @@ func NewWithConfig(ctx context.Context, config Config) (reg *Registry, err error
 // NewWithClient new the instance with INamingClient
 func NewWithClient(client naming_client.INamingClient) *Registry {
 	r := &Registry{
-		client:      client,
-		clusterName: "DEFAULT",
-		groupName:   "DEFAULT_GROUP",
+		client:          client,
+		clusterName:     "DEFAULT",
+		groupName:       "DEFAULT_GROUP",
+		defaultMetadata: make(map[string]string),
 	}
 	return r
 }
@@ -119,3 +122,17 @@ func (reg *Registry) SetGroupName(groupName string) *Registry {
 	reg.groupName = groupName
 	return reg
 }
+
+// SetDefaultEndpoint sets the default endpoint for service registration.
+// It overrides the service endpoints when registering if it's not empty.
+func (reg *Registry) SetDefaultEndpoint(endpoint string) *Registry {
+	reg.defaultEndpoint = endpoint
+	return reg
+}
+
+// SetDefaultMetadata sets the default metadata for service registration.
+// It will be merged with service's original metadata when registering.
+func (reg *Registry) SetDefaultMetadata(metadata map[string]string) *Registry {
+	reg.defaultMetadata = metadata
+	return reg
+}

contrib/registry/nacos/nacos_register.go

@@ -20,16 +20,28 @@ import (
 func (reg *Registry) Register(ctx context.Context, service gsvc.Service) (registered gsvc.Service, err error) {
 	metadata := map[string]string{}
 	endpoints := service.GetEndpoints()
+
+	// Apply default endpoint override if configured
+	if reg.defaultEndpoint != "" {
+		endpoints = gsvc.Endpoints{gsvc.NewEndpoint(reg.defaultEndpoint)}
+	}
+
 	p := vo.BatchRegisterInstanceParam{
 		ServiceName: service.GetName(),
 		GroupName:   reg.groupName,
 		Instances:   make([]vo.RegisterInstanceParam, 0, len(endpoints)),
 	}
 
+	// Copy service metadata
 	for k, v := range service.GetMetadata() {
 		metadata[k] = gconv.String(v)
 	}
 
+	// Apply default metadata if configured
+	for k, v := range reg.defaultMetadata {
+		metadata[k] = v
+	}
+
 	for _, endpoint := range endpoints {
 		p.Instances = append(p.Instances, vo.RegisterInstanceParam{
 			Ip:          endpoint.Host(),