fix swagger api

api/metadata/server.go

@@ -13,6 +13,8 @@ import (
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
 	descriptorpb "google.golang.org/protobuf/types/descriptorpb"
 )
 
@@ -38,9 +40,10 @@ func NewServer(srv *grpc.Server) *Server {
 }
 
 func (s *Server) load() error {
-	if len(s.services) == len(s.srv.GetServiceInfo()) {
+	if len(s.services) > 0 {
 		return nil
 	}
+	if s.srv != nil {
 		for name, info := range s.srv.GetServiceInfo() {
 			fdenc, ok := parseMetadata(info.Metadata)
 			if !ok {
@@ -61,6 +64,34 @@ func (s *Server) load() error {
 		}
 		return nil
 	}
+	var err error
+	protoregistry.GlobalFiles.RangeFiles(func(fd protoreflect.FileDescriptor) bool {
+		if fd.Services() != nil {
+			for i := 0; i < fd.Services().Len(); i++ {
+				svc := fd.Services().Get(i)
+				fdp, e := fileDescriptorProto(fd.Path())
+				if e != nil {
+					err = e
+					return false
+				}
+				fdps, e := allDependency(fdp)
+				if e != nil {
+					err = e
+					return false
+				}
+				s.services[string(svc.FullName())] = &dpb.FileDescriptorSet{File: fdps}
+				if svc.Methods() != nil {
+					for j := 0; j < svc.Methods().Len(); j++ {
+						method := svc.Methods().Get(j)
+						s.methods[string(svc.FullName())] = append(s.methods[string(svc.FullName())], string(method.Name()))
+					}
+				}
+			}
+		}
+		return true
+	})
+	return err
+}
 
 // ListServices return all services
 func (s *Server) ListServices(ctx context.Context, in *ListServicesRequest) (*ListServicesReply, error) {