frontlas: update redis model

pkg/frontlas/repo/model_service.go

@@ -1,5 +1,10 @@
 package repo
 
+import (
+	"bytes"
+	"fmt"
+)
+
 // key: serviceID; value: Service
 type Service struct {
 	Service    string `json:"service"`
@@ -7,3 +12,25 @@ type Service struct {
 	Addr       string `json:"addr"`
 	UpdateTime int64  `json:"update_time"`
 }
+
+func (service *Service) MarshalJSON() ([]byte, error) {
+	buffer := bytes.NewBufferString("{")
+	_, err := buffer.WriteString(fmt.Sprintf("service: %s, ", service.Service))
+	if err != nil {
+		return nil, err
+	}
+	_, err = buffer.WriteString(fmt.Sprintf("frontierID: %s, ", service.FrontierID))
+	if err != nil {
+		return nil, err
+	}
+	_, err = buffer.WriteString(fmt.Sprintf("addr: %s, ", service.Addr))
+	if err != nil {
+		return nil, err
+	}
+	_, err = buffer.WriteString(fmt.Sprintf("update_time: %d", service.UpdateTime))
+	if err != nil {
+		return nil, err
+	}
+	buffer.WriteString("}")
+	return buffer.Bytes(), nil
+}