feat: registry.

registry/etcd/service.go

@@ -0,0 +1,20 @@
+package etcd
+
+import (
+	"encoding/json"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+func marshal(si *registry.ServiceInstance) (string, error) {
+	data, err := json.Marshal(si)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}
+
+func unmarshal(data []byte) (si *registry.ServiceInstance, err error) {
+	err = json.Unmarshal(data, &si)
+	return
+}