修改完善nacos熔断机制

utils/nacos/service.go

@@ -10,8 +10,9 @@ import (
 )
 
 var (
-	cli       naming_client.INamingClient
-	groupName string
+	cli            naming_client.INamingClient
+	groupName      string
+	ServerUriCache = make(map[string]model.Instance)
 )
 
 // NewNacosRegistry 创建一个nacos注册中心
@@ -85,16 +86,18 @@ func DiscoverServiceList(serviceName string) ([]model.Instance, error) {
 
 // DiscoverService 发现一个服务
 func DiscoverService(serviceName string) (model.Instance, error) {
+	ServiceCache := ServerUriCache[serviceName]
 	client, err := NewNacosRegistry()
 	if err != nil {
-		return model.Instance{}, err
+		return ServiceCache, err
 	}
 	instances, err := (*client).SelectOneHealthyInstance(vo.SelectOneHealthInstanceParam{
 		ServiceName: serviceName,
 		GroupName:   groupName,
 	})
 	if err != nil {
-		return model.Instance{}, err
+		return ServiceCache, err
 	}
+	ServerUriCache[serviceName] = *instances
 	return *instances, nil
 }