add direct service address support for grpc client (#2991)

contrib/registry/file/file_discovery.go

@@ -94,6 +94,7 @@ func (r *Registry) getServices(ctx context.Context) (services []gsvc.Service, er
 				`service "%s" is expired, update at: %s, current: %s, sub duration: %s`,
 				s.GetKey(), updateAt.String(), nowTime.String(), subDuration.String(),
 			)
+			_ = gfile.Remove(filePath)
 			continue
 		}
 		services = append(services, s)

contrib/rpc/grpcx/grpcx_grpc_client.go

@@ -8,12 +8,14 @@ package grpcx
 
 import (
 	"fmt"
-
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
 
+	"github.com/gogf/gf/v2/errors/gcode"
+	"github.com/gogf/gf/v2/errors/gerror"
 	"github.com/gogf/gf/v2/net/gsel"
 	"github.com/gogf/gf/v2/net/gsvc"
+	"github.com/gogf/gf/v2/text/gstr"
 )
 
 // DefaultGrpcDialOptions returns the default options for creating grpc client connection.
@@ -25,13 +27,37 @@ func (c modClient) DefaultGrpcDialOptions() []grpc.DialOption {
 }
 
 // NewGrpcClientConn creates and returns a client connection for given service `appId`.
-func (c modClient) NewGrpcClientConn(serviceName string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
+func (c modClient) NewGrpcClientConn(serviceNameOrAddress string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
 	autoLoadAndRegisterFileRegistry()
 
 	var (
-		service           = gsvc.NewServiceWithName(serviceName)
+		dialAddress       = serviceNameOrAddress
 		grpcClientOptions = make([]grpc.DialOption, 0)
 	)
+	if isServiceName(serviceNameOrAddress) {
+		dialAddress = fmt.Sprintf(
+			`%s://%s`,
+			gsvc.Schema, gsvc.NewServiceWithName(serviceNameOrAddress).GetKey(),
+		)
+	} else {
+		addressParts := gstr.Split(serviceNameOrAddress, gsvc.EndpointHostPortDelimiter)
+		switch len(addressParts) {
+		case 2:
+			if addressParts[0] == "" {
+				return nil, gerror.NewCodef(
+					gcode.CodeInvalidParameter,
+					`invalid address "%s" for client, missing host`,
+					serviceNameOrAddress,
+				)
+			}
+		default:
+			return nil, gerror.NewCodef(
+				gcode.CodeInvalidParameter,
+				`invalid address "%s" for client`,
+				serviceNameOrAddress,
+			)
+		}
+	}
 	grpcClientOptions = append(grpcClientOptions, c.DefaultGrpcDialOptions()...)
 	if len(opts) > 0 {
 		grpcClientOptions = append(grpcClientOptions, opts...)
@@ -43,7 +69,7 @@ func (c modClient) NewGrpcClientConn(serviceName string, opts ...grpc.DialOption
 	grpcClientOptions = append(grpcClientOptions, c.ChainStream(
 		c.StreamTracing,
 	))
-	conn, err := grpc.Dial(fmt.Sprintf(`%s://%s`, gsvc.Schema, service.GetKey()), grpcClientOptions...)
+	conn, err := grpc.Dial(dialAddress, grpcClientOptions...)
 	if err != nil {
 		return nil, err
 	}
@@ -52,8 +78,8 @@ func (c modClient) NewGrpcClientConn(serviceName string, opts ...grpc.DialOption
 
 // MustNewGrpcClientConn creates and returns a client connection for given service `appId`.
 // It panics if any error occurs.
-func (c modClient) MustNewGrpcClientConn(serviceName string, opts ...grpc.DialOption) *grpc.ClientConn {
-	conn, err := c.NewGrpcClientConn(serviceName, opts...)
+func (c modClient) MustNewGrpcClientConn(serviceNameOrAddress string, opts ...grpc.DialOption) *grpc.ClientConn {
+	conn, err := c.NewGrpcClientConn(serviceNameOrAddress, opts...)
 	if err != nil {
 		panic(err)
 	}
@@ -75,3 +101,9 @@ func (c modClient) ChainUnary(interceptors ...grpc.UnaryClientInterceptor) grpc.
 func (c modClient) ChainStream(interceptors ...grpc.StreamClientInterceptor) grpc.DialOption {
 	return grpc.WithChainStreamInterceptor(interceptors...)
 }
+
+// isServiceName checks and returns whether given input parameter is service name or not.
+// It checks by whether the parameter is address by containing port delimiter character ':'.
+func isServiceName(serviceNameOrAddress string) bool {
+	return !gstr.Contains(serviceNameOrAddress, gsvc.EndpointHostPortDelimiter)
+}

contrib/rpc/grpcx/grpcx_grpc_server.go

@@ -129,11 +129,14 @@ func (s *GrpcServer) doSignalListen() {
 	var ctx = context.Background()
 	gproc.AddSigHandlerShutdown(func(sig os.Signal) {
 		s.Logger().Infof(ctx, "signal received: %s, gracefully shutting down", sig.String())
+		// Deregister services when shutdown signal triggers.
 		s.doServiceDeregister()
 		time.Sleep(time.Second)
 		s.Stop()
 	})
 	gproc.Listen()
+	// Deregister services when process ends.
+	s.doServiceDeregister()
 }
 
 // Logger is alias of GetLogger.
@@ -195,6 +198,7 @@ func (s *GrpcServer) doServiceDeregister() {
 			s.Logger().Errorf(ctx, `%+v`, err)
 		}
 	}
+	s.services = s.services[:0]
 }
 
 // Start starts the server in no-blocking way.
@@ -213,6 +217,7 @@ func (s *GrpcServer) Wait() {
 
 // Stop gracefully stops the server.
 func (s *GrpcServer) Stop() {
+	s.doServiceDeregister()
 	s.Server.GracefulStop()
 }
 

contrib/rpc/grpcx/grpcx_registry_file.go

@@ -23,10 +23,15 @@ func autoLoadAndRegisterFileRegistry() {
 		return
 	}
 	var (
-		ctx          = gctx.GetInitCtx()
-		fileRegistry = file.New(gfile.Temp("gsvc"))
+		ctx           = gctx.GetInitCtx()
+		directoryPath = gfile.Temp("gsvc")
+		fileRegistry  = file.New(directoryPath)
 	)
 
-	g.Log().Debug(ctx, `set default registry using file registry as no custom registry set`)
+	g.Log().Debugf(
+		ctx,
+		`set default registry using file registry as no custom registry set, path: %s`,
+		directoryPath,
+	)
 	Resolver.Register(fileRegistry)
 }

contrib/rpc/grpcx/grpcx_unit_z_grpc_server_basic_test.go

@@ -0,0 +1,63 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package grpcx_test
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/gogf/gf/contrib/rpc/grpcx/v2"
+	"github.com/gogf/gf/contrib/rpc/grpcx/v2/testdata/controller"
+	"github.com/gogf/gf/contrib/rpc/grpcx/v2/testdata/protobuf"
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/net/gipv4"
+	"github.com/gogf/gf/v2/os/gctx"
+	"github.com/gogf/gf/v2/test/gtest"
+	"github.com/gogf/gf/v2/util/guid"
+)
+
+func Test_Grpcx_Grpc_Server_Basic(t *testing.T) {
+	c := grpcx.Server.NewConfig()
+	c.Name = guid.S()
+	s := grpcx.Server.New(c)
+	controller.Register(s)
+	s.Start()
+	time.Sleep(time.Millisecond * 100)
+	defer s.Stop()
+
+	// use service discovery.
+	gtest.C(t, func(t *gtest.T) {
+		var (
+			ctx    = gctx.New()
+			conn   = grpcx.Client.MustNewGrpcClientConn(c.Name)
+			client = protobuf.NewGreeterClient(conn)
+		)
+		res, err := client.SayHello(ctx, &protobuf.HelloRequest{Name: "World"})
+		if err != nil {
+			g.Log().Error(ctx, err)
+			return
+		}
+		t.Assert(res.Message, `Hello World`)
+	})
+
+	// use direct address.
+	gtest.C(t, func(t *gtest.T) {
+		var (
+			ctx     = gctx.New()
+			address = fmt.Sprintf(`%s:%d`, gipv4.MustGetIntranetIp(), s.GetListenedPort())
+			conn    = grpcx.Client.MustNewGrpcClientConn(address)
+			client  = protobuf.NewGreeterClient(conn)
+		)
+		res, err := client.SayHello(ctx, &protobuf.HelloRequest{Name: "World"})
+		if err != nil {
+			g.Log().Error(ctx, err)
+			return
+		}
+		t.Assert(res.Message, `Hello World`)
+	})
+}

contrib/rpc/grpcx/internal/balancer/balancer_builder.go

@@ -33,6 +33,13 @@ func (b *Builder) Build(info base.PickerBuildInfo) balancer.Picker {
 	)
 	for conn, subConnInfo := range info.ReadySCs {
 		svc, _ := subConnInfo.Address.Attributes.Value(rawSvcKeyInSubConnInfo).(gsvc.Service)
+		if svc == nil && subConnInfo.Address.Addr != "" {
+			// It might be a direct address without service name, it so creates a default service.
+			svc = &gsvc.LocalService{
+				Name:      subConnInfo.Address.ServerName,
+				Endpoints: gsvc.NewEndpoints(subConnInfo.Address.Addr),
+			}
+		}
 		if svc == nil {
 			g.Log().Noticef(ctx, `empty service read from: %+v`, subConnInfo.Address)
 			continue

contrib/rpc/grpcx/testdata/controller/helloworld.go

@@ -0,0 +1,27 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package controller
+
+import (
+	"context"
+
+	"github.com/gogf/gf/contrib/rpc/grpcx/v2"
+	"github.com/gogf/gf/contrib/rpc/grpcx/v2/testdata/protobuf"
+)
+
+type Controller struct {
+	protobuf.UnimplementedGreeterServer
+}
+
+func Register(s *grpcx.GrpcServer) {
+	protobuf.RegisterGreeterServer(s.Server, &Controller{})
+}
+
+// SayHello implements helloworld.GreeterServer
+func (s *Controller) SayHello(ctx context.Context, in *protobuf.HelloRequest) (*protobuf.HelloReply, error) {
+	return &protobuf.HelloReply{Message: "Hello " + in.GetName()}, nil
+}

contrib/rpc/grpcx/testdata/protobuf/helloworld.pb.go

@@ -0,0 +1,217 @@
+// protoc --go_out=paths=source_relative:. --go-grpc_out=paths=source_relative:. *.proto
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.21.12
+// source: helloworld.proto
+
+package protobuf
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// The request message containing the user's name.
+type HelloRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+}
+
+func (x *HelloRequest) Reset() {
+	*x = HelloRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_helloworld_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *HelloRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*HelloRequest) ProtoMessage() {}
+
+func (x *HelloRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_helloworld_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use HelloRequest.ProtoReflect.Descriptor instead.
+func (*HelloRequest) Descriptor() ([]byte, []int) {
+	return file_helloworld_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *HelloRequest) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+// The response message containing the greetings
+type HelloReply struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Message string `protobuf:"bytes,1,opt,name=message,proto3" json:"message,omitempty"`
+}
+
+func (x *HelloReply) Reset() {
+	*x = HelloReply{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_helloworld_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *HelloReply) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*HelloReply) ProtoMessage() {}
+
+func (x *HelloReply) ProtoReflect() protoreflect.Message {
+	mi := &file_helloworld_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use HelloReply.ProtoReflect.Descriptor instead.
+func (*HelloReply) Descriptor() ([]byte, []int) {
+	return file_helloworld_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *HelloReply) GetMessage() string {
+	if x != nil {
+		return x.Message
+	}
+	return ""
+}
+
+var File_helloworld_proto protoreflect.FileDescriptor
+
+var file_helloworld_proto_rawDesc = []byte{
+	0x0a, 0x10, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x2e, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x12, 0x08, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x22, 0x22, 0x0a, 0x0c,
+	0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x12, 0x0a, 0x04,
+	0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65,
+	0x22, 0x26, 0x0a, 0x0a, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x52, 0x65, 0x70, 0x6c, 0x79, 0x12, 0x18,
+	0x0a, 0x07, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52,
+	0x07, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x32, 0x45, 0x0a, 0x07, 0x47, 0x72, 0x65, 0x65,
+	0x74, 0x65, 0x72, 0x12, 0x3a, 0x0a, 0x08, 0x53, 0x61, 0x79, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x12,
+	0x16, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x48, 0x65, 0x6c, 0x6c, 0x6f,
+	0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x14, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62,
+	0x75, 0x66, 0x2e, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x52, 0x65, 0x70, 0x6c, 0x79, 0x22, 0x00, 0x42,
+	0x35, 0x5a, 0x33, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x67, 0x6f,
+	0x67, 0x66, 0x2f, 0x67, 0x66, 0x2f, 0x67, 0x72, 0x70, 0x63, 0x2f, 0x65, 0x78, 0x61, 0x6d, 0x70,
+	0x6c, 0x65, 0x2f, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x2f, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_helloworld_proto_rawDescOnce sync.Once
+	file_helloworld_proto_rawDescData = file_helloworld_proto_rawDesc
+)
+
+func file_helloworld_proto_rawDescGZIP() []byte {
+	file_helloworld_proto_rawDescOnce.Do(func() {
+		file_helloworld_proto_rawDescData = protoimpl.X.CompressGZIP(file_helloworld_proto_rawDescData)
+	})
+	return file_helloworld_proto_rawDescData
+}
+
+var file_helloworld_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_helloworld_proto_goTypes = []interface{}{
+	(*HelloRequest)(nil), // 0: protobuf.HelloRequest
+	(*HelloReply)(nil),   // 1: protobuf.HelloReply
+}
+var file_helloworld_proto_depIdxs = []int32{
+	0, // 0: protobuf.Greeter.SayHello:input_type -> protobuf.HelloRequest
+	1, // 1: protobuf.Greeter.SayHello:output_type -> protobuf.HelloReply
+	1, // [1:2] is the sub-list for method output_type
+	0, // [0:1] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_helloworld_proto_init() }
+func file_helloworld_proto_init() {
+	if File_helloworld_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_helloworld_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*HelloRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_helloworld_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*HelloReply); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_helloworld_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_helloworld_proto_goTypes,
+		DependencyIndexes: file_helloworld_proto_depIdxs,
+		MessageInfos:      file_helloworld_proto_msgTypes,
+	}.Build()
+	File_helloworld_proto = out.File
+	file_helloworld_proto_rawDesc = nil
+	file_helloworld_proto_goTypes = nil
+	file_helloworld_proto_depIdxs = nil
+}

contrib/rpc/grpcx/testdata/protobuf/helloworld.proto

@@ -0,0 +1,24 @@
+// protoc --go_out=paths=source_relative:. --go-grpc_out=paths=source_relative:. *.proto
+
+syntax = "proto3";
+
+package protobuf;
+
+option go_package = "github.com/gogf/gf/grpc/example/helloworld/protobuf";
+
+
+// The greeting service definition.
+service Greeter {
+  // Sends a greeting
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+}
+
+// The request message containing the user's name.
+message HelloRequest {
+  string name = 1;
+}
+
+// The response message containing the greetings
+message HelloReply {
+  string message = 1;
+}

contrib/rpc/grpcx/testdata/protobuf/helloworld_grpc.pb.go

@@ -0,0 +1,107 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.21.12
+// source: helloworld.proto
+
+package protobuf
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// GreeterClient is the client API for Greeter service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type GreeterClient interface {
+	// Sends a greeting
+	SayHello(ctx context.Context, in *HelloRequest, opts ...grpc.CallOption) (*HelloReply, error)
+}
+
+type greeterClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewGreeterClient(cc grpc.ClientConnInterface) GreeterClient {
+	return &greeterClient{cc}
+}
+
+func (c *greeterClient) SayHello(ctx context.Context, in *HelloRequest, opts ...grpc.CallOption) (*HelloReply, error) {
+	out := new(HelloReply)
+	err := c.cc.Invoke(ctx, "/protobuf.Greeter/SayHello", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// GreeterServer is the server API for Greeter service.
+// All implementations must embed UnimplementedGreeterServer
+// for forward compatibility
+type GreeterServer interface {
+	// Sends a greeting
+	SayHello(context.Context, *HelloRequest) (*HelloReply, error)
+	mustEmbedUnimplementedGreeterServer()
+}
+
+// UnimplementedGreeterServer must be embedded to have forward compatible implementations.
+type UnimplementedGreeterServer struct {
+}
+
+func (UnimplementedGreeterServer) SayHello(context.Context, *HelloRequest) (*HelloReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SayHello not implemented")
+}
+func (UnimplementedGreeterServer) mustEmbedUnimplementedGreeterServer() {}
+
+// UnsafeGreeterServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to GreeterServer will
+// result in compilation errors.
+type UnsafeGreeterServer interface {
+	mustEmbedUnimplementedGreeterServer()
+}
+
+func RegisterGreeterServer(s grpc.ServiceRegistrar, srv GreeterServer) {
+	s.RegisterService(&Greeter_ServiceDesc, srv)
+}
+
+func _Greeter_SayHello_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(HelloRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(GreeterServer).SayHello(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/protobuf.Greeter/SayHello",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(GreeterServer).SayHello(ctx, req.(*HelloRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// Greeter_ServiceDesc is the grpc.ServiceDesc for Greeter service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var Greeter_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "protobuf.Greeter",
+	HandlerType: (*GreeterServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "SayHello",
+			Handler:    _Greeter_SayHello_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "helloworld.proto",
+}

net/ghttp/ghttp.go

@@ -10,6 +10,7 @@ package ghttp
 import (
 	"net/http"
 	"reflect"
+	"sync"
 	"time"
 
 	"github.com/gorilla/websocket"
@@ -42,6 +43,7 @@ type (
 		statusHandlerMap map[string][]HandlerFunc  // Custom status handler map.
 		sessionManager   *gsession.Manager         // Session manager.
 		openapi          *goai.OpenApiV3           // The OpenApi specification management object.
+		serviceMu        sync.Mutex                // Concurrent safety for operations of attribute service.
 		service          gsvc.Service              // The service for Registry.
 		registrar        gsvc.Registrar            // Registrar for service register.
 	}

net/ghttp/ghttp_server.go

@@ -451,6 +451,7 @@ func Wait() {
 	go handleProcessSignal()
 
 	<-allShutdownChan
+
 	// Remove plugins.
 	serverMapping.Iterator(func(k string, v interface{}) bool {
 		s := v.(*Server)

net/ghttp/ghttp_server_admin.go

@@ -84,9 +84,8 @@ func (s *Server) EnableAdmin(pattern ...string) {
 
 // Shutdown shuts down current server.
 func (s *Server) Shutdown() error {
-	var (
-		ctx = context.TODO()
-	)
+	var ctx = context.TODO()
+	s.doServiceDeregister()
 	// Only shut down current servers.
 	// It may have multiple underlying http servers.
 	for _, v := range s.servers {

net/ghttp/ghttp_server_admin_process.go

@@ -258,7 +258,9 @@ func shutdownWebServersGracefully(ctx context.Context, signal os.Signal) {
 	}
 	serverMapping.RLockFunc(func(m map[string]interface{}) {
 		for _, v := range m {
-			for _, s := range v.(*Server).servers {
+			server := v.(*Server)
+			server.doServiceDeregister()
+			for _, s := range server.servers {
 				s.shutdown(ctx)
 			}
 		}

net/ghttp/ghttp_server_registry.go

@@ -22,6 +22,8 @@ func (s *Server) doServiceRegister() {
 	if s.registrar == nil {
 		return
 	}
+	s.serviceMu.Lock()
+	defer s.serviceMu.Unlock()
 	var (
 		ctx      = gctx.GetInitCtx()
 		protocol = gsvc.DefaultProtocol
@@ -56,11 +58,17 @@ func (s *Server) doServiceDeregister() {
 	if s.registrar == nil {
 		return
 	}
+	s.serviceMu.Lock()
+	defer s.serviceMu.Unlock()
+	if s.service == nil {
+		return
+	}
 	var ctx = gctx.GetInitCtx()
 	s.Logger().Debugf(ctx, `service deregister: %+v`, s.service)
 	if err := s.registrar.Deregister(ctx, s.service); err != nil {
 		s.Logger().Errorf(ctx, `%+v`, err)
 	}
+	s.service = nil
 }
 
 func (s *Server) calculateListenedEndpoints(ctx context.Context) gsvc.Endpoints {

net/gsel/gsel_selector_round_robin.go

@@ -37,6 +37,9 @@ func (s *selectorRoundRobin) Update(ctx context.Context, nodes Nodes) error {
 func (s *selectorRoundRobin) Pick(ctx context.Context) (node Node, done DoneFunc, err error) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
+	if len(s.nodes) == 0 {
+		return
+	}
 	node = s.nodes[s.next]
 	s.next = (s.next + 1) % len(s.nodes)
 	intlog.Printf(ctx, `Picked node: %s`, node.Address())