API: Reflection Service Support (#435)

app/commander/config.pb.go

@@ -85,6 +85,45 @@ func (x *Config) GetService() []*serial.TypedMessage {
 	return nil
 }
 
+// ReflectionConfig is the placeholder config for ReflectionService.
+type ReflectionConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *ReflectionConfig) Reset() {
+	*x = ReflectionConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_commander_config_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ReflectionConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ReflectionConfig) ProtoMessage() {}
+
+func (x *ReflectionConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_app_commander_config_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 ReflectionConfig.ProtoReflect.Descriptor instead.
+func (*ReflectionConfig) Descriptor() ([]byte, []int) {
+	return file_app_commander_config_proto_rawDescGZIP(), []int{1}
+}
+
 var File_app_commander_config_proto protoreflect.FileDescriptor
 
 var file_app_commander_config_proto_rawDesc = []byte{
@@ -99,13 +138,14 @@ var file_app_commander_config_proto_rawDesc = []byte{
 	0x18, 0x02, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x26, 0x2e, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63,
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-	0x6d, 0x6d, 0x61, 0x6e, 0x64, 0x65, 0x72, 0xaa, 0x02, 0x18, 0x56, 0x32, 0x52, 0x61, 0x79, 0x2e,
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-	0x65, 0x72, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x22, 0x12, 0x0a, 0x10, 0x52, 0x65, 0x66, 0x6c, 0x65,
+	0x63, 0x74, 0x69, 0x6f, 0x6e, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x42, 0x59, 0x0a, 0x1c, 0x63,
+	0x6f, 0x6d, 0x2e, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x61, 0x70,
+	0x70, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x61, 0x6e, 0x64, 0x65, 0x72, 0x50, 0x01, 0x5a, 0x1c, 0x76,
+	0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70,
+	0x70, 0x2f, 0x63, 0x6f, 0x6d, 0x6d, 0x61, 0x6e, 0x64, 0x65, 0x72, 0xaa, 0x02, 0x18, 0x56, 0x32,
+	0x52, 0x61, 0x79, 0x2e, 0x43, 0x6f, 0x72, 0x65, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x43, 0x6f, 0x6d,
+	0x6d, 0x61, 0x6e, 0x64, 0x65, 0x72, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -120,13 +160,14 @@ func file_app_commander_config_proto_rawDescGZIP() []byte {
 	return file_app_commander_config_proto_rawDescData
 }
 
-var file_app_commander_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_app_commander_config_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
 var file_app_commander_config_proto_goTypes = []interface{}{
 	(*Config)(nil),              // 0: v2ray.core.app.commander.Config
-	(*serial.TypedMessage)(nil), // 1: v2ray.core.common.serial.TypedMessage
+	(*ReflectionConfig)(nil),    // 1: v2ray.core.app.commander.ReflectionConfig
+	(*serial.TypedMessage)(nil), // 2: v2ray.core.common.serial.TypedMessage
 }
 var file_app_commander_config_proto_depIdxs = []int32{
-	1, // 0: v2ray.core.app.commander.Config.service:type_name -> v2ray.core.common.serial.TypedMessage
+	2, // 0: v2ray.core.app.commander.Config.service:type_name -> v2ray.core.common.serial.TypedMessage
 	1, // [1:1] is the sub-list for method output_type
 	1, // [1:1] is the sub-list for method input_type
 	1, // [1:1] is the sub-list for extension type_name
@@ -152,6 +193,18 @@ func file_app_commander_config_proto_init() {
 				return nil
 			}
 		}
+		file_app_commander_config_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ReflectionConfig); 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{
@@ -159,7 +212,7 @@ func file_app_commander_config_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_app_commander_config_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   1,
+			NumMessages:   2,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

app/commander/config.proto

@@ -16,3 +16,6 @@ message Config {
   // interface.
   repeated v2ray.core.common.serial.TypedMessage service = 2;
 }
+
+// ReflectionConfig is the placeholder config for ReflectionService.
+message ReflectionConfig {}

app/commander/service.go

@@ -3,7 +3,11 @@
 package commander
 
 import (
+	"context"
+
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/reflection"
+	"v2ray.com/core/common"
 )
 
 // Service is a Commander service.
@@ -11,3 +15,15 @@ type Service interface {
 	// Register registers the service itself to a gRPC server.
 	Register(*grpc.Server)
 }
+
+type reflectionService struct{}
+
+func (r reflectionService) Register(s *grpc.Server) {
+	reflection.Register(s)
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*ReflectionConfig)(nil), func(ctx context.Context, cfg interface{}) (interface{}, error) {
+		return reflectionService{}, nil
+	}))
+}

infra/conf/api.go

@@ -23,6 +23,8 @@ func (c *APIConfig) Build() (*commander.Config, error) {
 	services := make([]*serial.TypedMessage, 0, 16)
 	for _, s := range c.Services {
 		switch strings.ToLower(s) {
+		case "reflectionservice":
+			services = append(services, serial.ToTypedMessage(&commander.ReflectionConfig{}))
 		case "handlerservice":
 			services = append(services, serial.ToTypedMessage(&handlerservice.Config{}))
 		case "loggerservice":