♻️ Better grpc map encoder / decoder

.idea/modules.xml

@@ -2,7 +2,7 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/Dealer.iml" filepath="$PROJECT_DIR$/.idea/Dealer.iml" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/Nexus.iml" filepath="$PROJECT_DIR$/.idea/Nexus.iml" />
     </modules>
   </component>
 </project>

pkg/directory/command.go

@@ -0,0 +1,22 @@
+package directory
+
+const (
+	CommandMethodGet    = "get"
+	CommandMethodPut    = "put"
+	CommandMethodPatch  = "patch"
+	CommandMethodPost   = "post"
+	CommandMethodDelete = "delete"
+)
+
+type Command struct {
+	// The unique identifier of the command, different method command can hold the same command id
+	ID string `json:"id"`
+	// The method of the command, such as get, post, others; inspired by RESTful design
+	Method string `json:"method"`
+	// The tags of the command will be used to invoke the pre-command middlewares and post-command middlewares
+	Tags []string `json:"tags"`
+	// The implementation of the command, the handler is the service that will be invoked
+	Handler []*ServiceInstance `json:"handler"`
+
+	robinIndex uint
+}

pkg/directory/command_mapping.go

@@ -0,0 +1,62 @@
+package directory
+
+import (
+	"github.com/samber/lo"
+	"sync"
+)
+
+// In commands, we use the map and the mutex because it is usually read and only sometimes write
+var commandDirectory = make(map[string]*Command)
+var commandDirectoryMutex sync.Mutex
+
+func GetCommandKey(id, method string) string {
+	return id + ":" + method
+}
+
+func AddCommand(id, method string, tags []string, handler *ServiceInstance) {
+	commandDirectoryMutex.Lock()
+	defer commandDirectoryMutex.Unlock()
+
+	ky := GetCommandKey(id, method)
+	if _, ok := commandDirectory[id]; !ok {
+		commandDirectory[id] = &Command{
+			ID:      id,
+			Method:  method,
+			Tags:    tags,
+			Handler: []*ServiceInstance{handler},
+		}
+	} else {
+		commandDirectory[ky].Handler = append(commandDirectory[ky].Handler, handler)
+		commandDirectory[ky].Tags = lo.Uniq(append(commandDirectory[ky].Tags, tags...))
+	}
+
+	commandDirectory[ky].Handler = lo.UniqBy(commandDirectory[ky].Handler, func(item *ServiceInstance) string {
+		return item.ID
+	})
+}
+
+func GetCommandHandler(id, method string) *ServiceInstance {
+	commandDirectoryMutex.Lock()
+	defer commandDirectoryMutex.Unlock()
+
+	ky := GetCommandKey(id, method)
+	if val, ok := commandDirectory[ky]; ok {
+		if len(val.Handler) == 0 {
+			return nil
+		}
+
+		idx := val.robinIndex % uint(len(val.Handler))
+		val.robinIndex = idx + 1
+		return val.Handler[idx]
+	}
+
+	return nil
+}
+
+func RemoveCommand(id, method string) {
+	commandDirectoryMutex.Lock()
+	defer commandDirectoryMutex.Unlock()
+
+	ky := GetCommandKey(id, method)
+	delete(commandDirectory, ky)
+}

pkg/directory/command_rpc.go

@@ -0,0 +1,89 @@
+package directory
+
+import (
+	"context"
+	"git.solsynth.dev/hypernet/nexus/pkg/proto"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"io"
+	"time"
+)
+
+type CommandRpcServer struct {
+	proto.UnimplementedCommandControllerServer
+}
+
+func (c CommandRpcServer) AddCommand(ctx context.Context, info *proto.CommandInfo) (*proto.AddCommandResponse, error) {
+	clientId, err := GetClientId(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	service := GetServiceInstanceByType(clientId)
+	if service == nil {
+		return nil, status.Errorf(codes.NotFound, "service not found")
+	}
+
+	AddCommand(info.GetId(), info.GetMethod(), info.GetTags(), service)
+	return &proto.AddCommandResponse{
+		IsSuccess: true,
+	}, nil
+}
+
+func (c CommandRpcServer) RemoveCommand(ctx context.Context, request *proto.CommandLookupRequest) (*proto.RemoveCommandResponse, error) {
+	RemoveCommand(request.GetId(), request.GetMethod())
+	return &proto.RemoveCommandResponse{
+		IsSuccess: true,
+	}, nil
+}
+
+func (c CommandRpcServer) SendCommand(ctx context.Context, argument *proto.CommandArgument) (*proto.CommandReturn, error) {
+	id := argument.GetCommand()
+	method := argument.GetMethod()
+
+	handler := GetCommandHandler(id, method)
+	if handler == nil {
+		return nil, status.Errorf(codes.NotFound, "command not found")
+	}
+
+	conn, err := handler.GetGrpcConn()
+	if err != nil {
+		return nil, status.Errorf(codes.Unavailable, "service unavailable")
+	}
+
+	contx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	defer cancel()
+
+	return proto.NewCommandControllerClient(conn).SendCommand(contx, argument)
+}
+
+func (c CommandRpcServer) SendStreamCommand(g grpc.BidiStreamingServer[proto.CommandArgument, proto.CommandReturn]) error {
+	for {
+		pck, err := g.Recv()
+		if err == io.EOF {
+			return nil
+		} else if err != nil {
+			return err
+		}
+
+		id := pck.GetCommand()
+		method := pck.GetMethod()
+
+		handler := GetCommandHandler(id, method)
+		if handler == nil {
+			return status.Errorf(codes.NotFound, "command not found")
+		}
+
+		conn, err := handler.GetGrpcConn()
+
+		contx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+		result, _ := proto.NewCommandControllerClient(conn).SendCommand(contx, pck)
+		cancel()
+
+		_ = g.Send(&proto.CommandReturn{
+			Status:  result.Status,
+			Payload: result.Payload,
+		})
+	}
+}

pkg/directory/exts.go

@@ -0,0 +1,20 @@
+package directory
+
+import (
+	"context"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
+)
+
+func GetClientId(ctx context.Context) (string, error) {
+	var clientId string
+	if md, ok := metadata.FromIncomingContext(ctx); !ok {
+		return clientId, status.Errorf(codes.InvalidArgument, "missing metadata")
+	} else if val, ok := md["client_id"]; !ok || len(val) == 0 {
+		return clientId, status.Errorf(codes.Unauthenticated, "missing client_id in metadata")
+	} else {
+		clientId = val[0]
+	}
+	return clientId, nil
+}

pkg/directory/service_mapping.go

@@ -4,6 +4,7 @@ import (
 	"sync"
 )
 
+// In services, we use sync.Map because it will be both often read and write
 var serviceDirectory sync.Map
 
 func GetServiceInstance(id string) *ServiceInstance {

pkg/directory/service_rpc.go

@@ -3,17 +3,19 @@ package directory
 import (
 	"context"
 	"fmt"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 
 	"git.solsynth.dev/hypernet/nexus/pkg/proto"
 	"github.com/rs/zerolog/log"
 	"github.com/samber/lo"
 )
 
-type DirectoryRpcServer struct {
+type ServiceRpcServer struct {
 	proto.UnimplementedServiceDirectoryServer
 }
 
-func convertServiceToInfo(in *ServiceInstance) *proto.ServiceInfo {
+func instantiationService(in *ServiceInstance) *proto.ServiceInfo {
 	if in == nil {
 		return nil
 	}
@@ -26,23 +28,23 @@ func convertServiceToInfo(in *ServiceInstance) *proto.ServiceInfo {
 	}
 }
 
-func (v *DirectoryRpcServer) GetService(ctx context.Context, request *proto.GetServiceRequest) (*proto.GetServiceResponse, error) {
+func (v *ServiceRpcServer) GetService(ctx context.Context, request *proto.GetServiceRequest) (*proto.GetServiceResponse, error) {
 	if request.Id != nil {
 		out := GetServiceInstance(request.GetId())
 		return &proto.GetServiceResponse{
-			Data: convertServiceToInfo(out),
+			Data: instantiationService(out),
 		}, nil
 	}
 	if request.Type != nil {
 		out := GetServiceInstanceByType(request.GetType())
 		return &proto.GetServiceResponse{
-			Data: convertServiceToInfo(out),
+			Data: instantiationService(out),
 		}, nil
 	}
 	return nil, fmt.Errorf("no filter condition is provided")
 }
 
-func (v *DirectoryRpcServer) ListService(ctx context.Context, request *proto.ListServiceRequest) (*proto.ListServiceResponse, error) {
+func (v *ServiceRpcServer) ListService(ctx context.Context, request *proto.ListServiceRequest) (*proto.ListServiceResponse, error) {
 	var out []*ServiceInstance
 	if request.Type != nil {
 		out = ListServiceInstanceByType(request.GetType())
@@ -51,27 +53,36 @@ func (v *DirectoryRpcServer) ListService(ctx context.Context, request *proto.Lis
 	}
 	return &proto.ListServiceResponse{
 		Data: lo.Map(out, func(item *ServiceInstance, index int) *proto.ServiceInfo {
-			return convertServiceToInfo(item)
+			return instantiationService(item)
 		}),
 	}, nil
 }
 
-func (v *DirectoryRpcServer) AddService(ctx context.Context, info *proto.ServiceInfo) (*proto.AddServiceResponse, error) {
+func (v *ServiceRpcServer) AddService(ctx context.Context, info *proto.ServiceInfo) (*proto.AddServiceResponse, error) {
+	clientId, err := GetClientId(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	if info.GetId() != clientId {
+		return nil, status.Errorf(codes.InvalidArgument, "client_id mismatch in metadata")
+	}
+
 	in := &ServiceInstance{
-		ID:       info.GetId(),
+		ID:       clientId,
 		Type:     info.GetType(),
 		Label:    info.GetLabel(),
 		GrpcAddr: info.GetGrpcAddr(),
 		HttpAddr: info.HttpAddr,
 	}
 	AddServiceInstance(in)
-	log.Info().Str("id", info.GetId()).Str("label", info.GetLabel()).Msg("New service added.")
+	log.Info().Str("id", clientId).Str("label", info.GetLabel()).Msg("New service added.")
 	return &proto.AddServiceResponse{
 		IsSuccess: true,
 	}, nil
 }
 
-func (v *DirectoryRpcServer) RemoveService(ctx context.Context, request *proto.RemoveServiceRequest) (*proto.RemoveServiceResponse, error) {
+func (v *ServiceRpcServer) RemoveService(ctx context.Context, request *proto.RemoveServiceRequest) (*proto.RemoveServiceResponse, error) {
 	RemoveServiceInstance(request.GetId())
 	log.Info().Str("id", request.GetId()).Msg("A service removed.")
 	return &proto.RemoveServiceResponse{

pkg/http/api/index.go

@@ -6,6 +6,7 @@ import (
 )
 
 func MapAPIs(app *fiber.App) {
+	// Some built-in public-accessible APIs
 	wellKnown := app.Group("/.well-known").Name("Well Known")
 	{
 		wellKnown.Get("/", func(c *fiber.Ctx) error {
@@ -15,19 +16,13 @@ func MapAPIs(app *fiber.App) {
 		wellKnown.Get("/directory/services", listExistsService)
 	}
 
-	app.All("/cgi/:service/*", forwardServiceRequest)
+	// Common websocket gateway
-
+	app.Use(func(c *fiber.Ctx) error {
-	api := app.Group("/api").Name("API")
-	{
-		api.Use(func(c *fiber.Ctx) error {
 		/*if err := exts.EnsureAuthenticated(c); err != nil {
 			return err
 		}*/
 		return c.Next()
 	}).Get("/ws", websocket.New(listenWebsocket))
 
-		api.All("/*", func(c *fiber.Ctx) error {
+	app.All("/cgi/:service/*", forwardServiceRequest)
-			return fiber.ErrNotFound
-		})
-	}
 }

pkg/internal/grpc/server.go

@@ -25,7 +25,8 @@ func NewServer() *GrpcServer {
 		srv: grpc.NewServer(),
 	}
 
-	proto.RegisterServiceDirectoryServer(server.srv, &directory.DirectoryRpcServer{})
+	proto.RegisterServiceDirectoryServer(server.srv, &directory.ServiceRpcServer{})
+	proto.RegisterCommandControllerServer(server.srv, &directory.CommandRpcServer{})
 	proto.RegisterStreamControllerServer(server.srv, server)
 	health.RegisterHealthServer(server.srv, server)
 

pkg/internal/services/pusher_conn.go

@@ -1,43 +0,0 @@
-package services
-
-import (
-	"context"
-	firebase "firebase.google.com/go"
-	"github.com/sideshow/apns2"
-	"github.com/sideshow/apns2/token"
-	"github.com/spf13/viper"
-	"google.golang.org/api/option"
-)
-
-// ExtFire is a Firebase App client
-var ExtFire *firebase.App
-
-func SetupFirebase() error {
-	opt := option.WithCredentialsFile(viper.GetString("firebase_credentials"))
-	app, err := firebase.NewApp(context.Background(), nil, opt)
-	if err != nil {
-		return err
-	} else {
-		ExtFire = app
-	}
-
-	return nil
-}
-
-// ExtAPNS is an Apple Push Notification Services client
-var ExtAPNS *apns2.Client
-
-func SetupAPNS() error {
-	authKey, err := token.AuthKeyFromFile(viper.GetString("apns_credentials"))
-	if err != nil {
-		return err
-	}
-
-	ExtAPNS = apns2.NewTokenClient(&token.Token{
-		AuthKey: authKey,
-		KeyID:   viper.GetString("apns_credentials_key"),
-		TeamID:  viper.GetString("apns_credentials_team"),
-	}).Production()
-
-	return nil
-}

pkg/main.go

@@ -5,8 +5,6 @@ import (
 	"os/signal"
 	"syscall"
 
-	"git.solsynth.dev/hypernet/nexus/pkg/internal/services"
-
 	server "git.solsynth.dev/hypernet/nexus/pkg/http"
 	pkg "git.solsynth.dev/hypernet/nexus/pkg/internal"
 	"git.solsynth.dev/hypernet/nexus/pkg/internal/grpc"
@@ -34,14 +32,6 @@ func main() {
 		log.Panic().Err(err).Msg("An error occurred when loading settings.")
 	}
 
-	// Set up external services
-	if err := services.SetupFirebase(); err != nil {
-		log.Warn().Err(err).Msg("An error occurred when setup firebase, firebase notification push is unavailable...")
-	}
-	if err := services.SetupAPNS(); err != nil {
-		log.Warn().Err(err).Msg("An error occurred when setup APNs, apple notification push is unavailable...")
-	}
-
 	// Server
 	go server.NewServer().Listen()
 

pkg/proto/command.pb.go

@@ -0,0 +1,457 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.35.1
+// 	protoc        v5.28.2
+// source: command.proto
+
+package proto
+
+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)
+)
+
+type CommandInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Id     string   `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Method string   `protobuf:"bytes,2,opt,name=method,proto3" json:"method,omitempty"`
+	Tags   []string `protobuf:"bytes,3,rep,name=tags,proto3" json:"tags,omitempty"`
+}
+
+func (x *CommandInfo) Reset() {
+	*x = CommandInfo{}
+	mi := &file_command_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *CommandInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CommandInfo) ProtoMessage() {}
+
+func (x *CommandInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_command_proto_msgTypes[0]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CommandInfo.ProtoReflect.Descriptor instead.
+func (*CommandInfo) Descriptor() ([]byte, []int) {
+	return file_command_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *CommandInfo) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *CommandInfo) GetMethod() string {
+	if x != nil {
+		return x.Method
+	}
+	return ""
+}
+
+func (x *CommandInfo) GetTags() []string {
+	if x != nil {
+		return x.Tags
+	}
+	return nil
+}
+
+type CommandLookupRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Id     string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Method string `protobuf:"bytes,2,opt,name=method,proto3" json:"method,omitempty"`
+}
+
+func (x *CommandLookupRequest) Reset() {
+	*x = CommandLookupRequest{}
+	mi := &file_command_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *CommandLookupRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CommandLookupRequest) ProtoMessage() {}
+
+func (x *CommandLookupRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_command_proto_msgTypes[1]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CommandLookupRequest.ProtoReflect.Descriptor instead.
+func (*CommandLookupRequest) Descriptor() ([]byte, []int) {
+	return file_command_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *CommandLookupRequest) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *CommandLookupRequest) GetMethod() string {
+	if x != nil {
+		return x.Method
+	}
+	return ""
+}
+
+type AddCommandResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	IsSuccess bool `protobuf:"varint,1,opt,name=is_success,json=isSuccess,proto3" json:"is_success,omitempty"`
+}
+
+func (x *AddCommandResponse) Reset() {
+	*x = AddCommandResponse{}
+	mi := &file_command_proto_msgTypes[2]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *AddCommandResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*AddCommandResponse) ProtoMessage() {}
+
+func (x *AddCommandResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_command_proto_msgTypes[2]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use AddCommandResponse.ProtoReflect.Descriptor instead.
+func (*AddCommandResponse) Descriptor() ([]byte, []int) {
+	return file_command_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *AddCommandResponse) GetIsSuccess() bool {
+	if x != nil {
+		return x.IsSuccess
+	}
+	return false
+}
+
+type RemoveCommandResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	IsSuccess bool `protobuf:"varint,1,opt,name=is_success,json=isSuccess,proto3" json:"is_success,omitempty"`
+}
+
+func (x *RemoveCommandResponse) Reset() {
+	*x = RemoveCommandResponse{}
+	mi := &file_command_proto_msgTypes[3]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *RemoveCommandResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RemoveCommandResponse) ProtoMessage() {}
+
+func (x *RemoveCommandResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_command_proto_msgTypes[3]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RemoveCommandResponse.ProtoReflect.Descriptor instead.
+func (*RemoveCommandResponse) Descriptor() ([]byte, []int) {
+	return file_command_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *RemoveCommandResponse) GetIsSuccess() bool {
+	if x != nil {
+		return x.IsSuccess
+	}
+	return false
+}
+
+type CommandArgument struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Command string `protobuf:"bytes,1,opt,name=command,proto3" json:"command,omitempty"`
+	Method  string `protobuf:"bytes,2,opt,name=method,proto3" json:"method,omitempty"`
+	Payload []byte `protobuf:"bytes,3,opt,name=payload,proto3,oneof" json:"payload,omitempty"`
+}
+
+func (x *CommandArgument) Reset() {
+	*x = CommandArgument{}
+	mi := &file_command_proto_msgTypes[4]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *CommandArgument) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CommandArgument) ProtoMessage() {}
+
+func (x *CommandArgument) ProtoReflect() protoreflect.Message {
+	mi := &file_command_proto_msgTypes[4]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CommandArgument.ProtoReflect.Descriptor instead.
+func (*CommandArgument) Descriptor() ([]byte, []int) {
+	return file_command_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *CommandArgument) GetCommand() string {
+	if x != nil {
+		return x.Command
+	}
+	return ""
+}
+
+func (x *CommandArgument) GetMethod() string {
+	if x != nil {
+		return x.Method
+	}
+	return ""
+}
+
+func (x *CommandArgument) GetPayload() []byte {
+	if x != nil {
+		return x.Payload
+	}
+	return nil
+}
+
+type CommandReturn struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Status  int32  `protobuf:"varint,1,opt,name=status,proto3" json:"status,omitempty"`
+	Payload []byte `protobuf:"bytes,2,opt,name=payload,proto3,oneof" json:"payload,omitempty"`
+}
+
+func (x *CommandReturn) Reset() {
+	*x = CommandReturn{}
+	mi := &file_command_proto_msgTypes[5]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *CommandReturn) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CommandReturn) ProtoMessage() {}
+
+func (x *CommandReturn) ProtoReflect() protoreflect.Message {
+	mi := &file_command_proto_msgTypes[5]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CommandReturn.ProtoReflect.Descriptor instead.
+func (*CommandReturn) Descriptor() ([]byte, []int) {
+	return file_command_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *CommandReturn) GetStatus() int32 {
+	if x != nil {
+		return x.Status
+	}
+	return 0
+}
+
+func (x *CommandReturn) GetPayload() []byte {
+	if x != nil {
+		return x.Payload
+	}
+	return nil
+}
+
+var File_command_proto protoreflect.FileDescriptor
+
+var file_command_proto_rawDesc = []byte{
+	0x0a, 0x0d, 0x63, 0x6f, 0x6d, 0x6d, 0x61, 0x6e, 0x64, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
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+}
+
+var (
+	file_command_proto_rawDescOnce sync.Once
+	file_command_proto_rawDescData = file_command_proto_rawDesc
+)
+
+func file_command_proto_rawDescGZIP() []byte {
+	file_command_proto_rawDescOnce.Do(func() {
+		file_command_proto_rawDescData = protoimpl.X.CompressGZIP(file_command_proto_rawDescData)
+	})
+	return file_command_proto_rawDescData
+}
+
+var file_command_proto_msgTypes = make([]protoimpl.MessageInfo, 6)
+var file_command_proto_goTypes = []any{
+	(*CommandInfo)(nil),           // 0: proto.CommandInfo
+	(*CommandLookupRequest)(nil),  // 1: proto.CommandLookupRequest
+	(*AddCommandResponse)(nil),    // 2: proto.AddCommandResponse
+	(*RemoveCommandResponse)(nil), // 3: proto.RemoveCommandResponse
+	(*CommandArgument)(nil),       // 4: proto.CommandArgument
+	(*CommandReturn)(nil),         // 5: proto.CommandReturn
+}
+var file_command_proto_depIdxs = []int32{
+	0, // 0: proto.CommandController.AddCommand:input_type -> proto.CommandInfo
+	1, // 1: proto.CommandController.RemoveCommand:input_type -> proto.CommandLookupRequest
+	4, // 2: proto.CommandController.SendCommand:input_type -> proto.CommandArgument
+	4, // 3: proto.CommandController.SendStreamCommand:input_type -> proto.CommandArgument
+	2, // 4: proto.CommandController.AddCommand:output_type -> proto.AddCommandResponse
+	3, // 5: proto.CommandController.RemoveCommand:output_type -> proto.RemoveCommandResponse
+	5, // 6: proto.CommandController.SendCommand:output_type -> proto.CommandReturn
+	5, // 7: proto.CommandController.SendStreamCommand:output_type -> proto.CommandReturn
+	4, // [4:8] is the sub-list for method output_type
+	0, // [0:4] 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_command_proto_init() }
+func file_command_proto_init() {
+	if File_command_proto != nil {
+		return
+	}
+	file_command_proto_msgTypes[4].OneofWrappers = []any{}
+	file_command_proto_msgTypes[5].OneofWrappers = []any{}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_command_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   6,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_command_proto_goTypes,
+		DependencyIndexes: file_command_proto_depIdxs,
+		MessageInfos:      file_command_proto_msgTypes,
+	}.Build()
+	File_command_proto = out.File
+	file_command_proto_rawDesc = nil
+	file_command_proto_goTypes = nil
+	file_command_proto_depIdxs = nil
+}

pkg/proto/command.proto

@@ -0,0 +1,42 @@
+syntax = "proto3";
+
+option go_package = ".;proto";
+
+package proto;
+
+service CommandController {
+  rpc AddCommand(CommandInfo) returns (AddCommandResponse) {}
+  rpc RemoveCommand(CommandLookupRequest) returns (RemoveCommandResponse) {}
+  rpc SendCommand(CommandArgument) returns (CommandReturn) {}
+  rpc SendStreamCommand(stream CommandArgument) returns (stream CommandReturn) {}
+}
+
+message CommandInfo {
+  string id = 1;
+  string method = 2;
+  repeated string tags = 3;
+}
+
+message CommandLookupRequest {
+  string id = 1;
+  string method = 2;
+}
+
+message AddCommandResponse {
+  bool is_success = 1;
+}
+
+message RemoveCommandResponse {
+  bool is_success = 1;
+}
+
+message CommandArgument {
+  string command = 1;
+  string method = 2;
+  optional bytes payload = 3;
+}
+
+message CommandReturn {
+  int32 status = 1;
+  optional bytes payload = 2;
+}

pkg/proto/command_grpc.pb.go

@@ -0,0 +1,230 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.5.1
+// - protoc             v5.28.2
+// source: command.proto
+
+package proto
+
+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 v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	CommandController_AddCommand_FullMethodName        = "/proto.CommandController/AddCommand"
+	CommandController_RemoveCommand_FullMethodName     = "/proto.CommandController/RemoveCommand"
+	CommandController_SendCommand_FullMethodName       = "/proto.CommandController/SendCommand"
+	CommandController_SendStreamCommand_FullMethodName = "/proto.CommandController/SendStreamCommand"
+)
+
+// CommandControllerClient is the client API for CommandController 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 CommandControllerClient interface {
+	AddCommand(ctx context.Context, in *CommandInfo, opts ...grpc.CallOption) (*AddCommandResponse, error)
+	RemoveCommand(ctx context.Context, in *CommandLookupRequest, opts ...grpc.CallOption) (*RemoveCommandResponse, error)
+	SendCommand(ctx context.Context, in *CommandArgument, opts ...grpc.CallOption) (*CommandReturn, error)
+	SendStreamCommand(ctx context.Context, opts ...grpc.CallOption) (grpc.BidiStreamingClient[CommandArgument, CommandReturn], error)
+}
+
+type commandControllerClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewCommandControllerClient(cc grpc.ClientConnInterface) CommandControllerClient {
+	return &commandControllerClient{cc}
+}
+
+func (c *commandControllerClient) AddCommand(ctx context.Context, in *CommandInfo, opts ...grpc.CallOption) (*AddCommandResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(AddCommandResponse)
+	err := c.cc.Invoke(ctx, CommandController_AddCommand_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *commandControllerClient) RemoveCommand(ctx context.Context, in *CommandLookupRequest, opts ...grpc.CallOption) (*RemoveCommandResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(RemoveCommandResponse)
+	err := c.cc.Invoke(ctx, CommandController_RemoveCommand_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *commandControllerClient) SendCommand(ctx context.Context, in *CommandArgument, opts ...grpc.CallOption) (*CommandReturn, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CommandReturn)
+	err := c.cc.Invoke(ctx, CommandController_SendCommand_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *commandControllerClient) SendStreamCommand(ctx context.Context, opts ...grpc.CallOption) (grpc.BidiStreamingClient[CommandArgument, CommandReturn], error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	stream, err := c.cc.NewStream(ctx, &CommandController_ServiceDesc.Streams[0], CommandController_SendStreamCommand_FullMethodName, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &grpc.GenericClientStream[CommandArgument, CommandReturn]{ClientStream: stream}
+	return x, nil
+}
+
+// This type alias is provided for backwards compatibility with existing code that references the prior non-generic stream type by name.
+type CommandController_SendStreamCommandClient = grpc.BidiStreamingClient[CommandArgument, CommandReturn]
+
+// CommandControllerServer is the server API for CommandController service.
+// All implementations must embed UnimplementedCommandControllerServer
+// for forward compatibility.
+type CommandControllerServer interface {
+	AddCommand(context.Context, *CommandInfo) (*AddCommandResponse, error)
+	RemoveCommand(context.Context, *CommandLookupRequest) (*RemoveCommandResponse, error)
+	SendCommand(context.Context, *CommandArgument) (*CommandReturn, error)
+	SendStreamCommand(grpc.BidiStreamingServer[CommandArgument, CommandReturn]) error
+	mustEmbedUnimplementedCommandControllerServer()
+}
+
+// UnimplementedCommandControllerServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedCommandControllerServer struct{}
+
+func (UnimplementedCommandControllerServer) AddCommand(context.Context, *CommandInfo) (*AddCommandResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method AddCommand not implemented")
+}
+func (UnimplementedCommandControllerServer) RemoveCommand(context.Context, *CommandLookupRequest) (*RemoveCommandResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method RemoveCommand not implemented")
+}
+func (UnimplementedCommandControllerServer) SendCommand(context.Context, *CommandArgument) (*CommandReturn, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SendCommand not implemented")
+}
+func (UnimplementedCommandControllerServer) SendStreamCommand(grpc.BidiStreamingServer[CommandArgument, CommandReturn]) error {
+	return status.Errorf(codes.Unimplemented, "method SendStreamCommand not implemented")
+}
+func (UnimplementedCommandControllerServer) mustEmbedUnimplementedCommandControllerServer() {}
+func (UnimplementedCommandControllerServer) testEmbeddedByValue()                           {}
+
+// UnsafeCommandControllerServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to CommandControllerServer will
+// result in compilation errors.
+type UnsafeCommandControllerServer interface {
+	mustEmbedUnimplementedCommandControllerServer()
+}
+
+func RegisterCommandControllerServer(s grpc.ServiceRegistrar, srv CommandControllerServer) {
+	// If the following call pancis, it indicates UnimplementedCommandControllerServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&CommandController_ServiceDesc, srv)
+}
+
+func _CommandController_AddCommand_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CommandInfo)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CommandControllerServer).AddCommand(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CommandController_AddCommand_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CommandControllerServer).AddCommand(ctx, req.(*CommandInfo))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CommandController_RemoveCommand_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CommandLookupRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CommandControllerServer).RemoveCommand(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CommandController_RemoveCommand_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CommandControllerServer).RemoveCommand(ctx, req.(*CommandLookupRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CommandController_SendCommand_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CommandArgument)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CommandControllerServer).SendCommand(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CommandController_SendCommand_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CommandControllerServer).SendCommand(ctx, req.(*CommandArgument))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CommandController_SendStreamCommand_Handler(srv interface{}, stream grpc.ServerStream) error {
+	return srv.(CommandControllerServer).SendStreamCommand(&grpc.GenericServerStream[CommandArgument, CommandReturn]{ServerStream: stream})
+}
+
+// This type alias is provided for backwards compatibility with existing code that references the prior non-generic stream type by name.
+type CommandController_SendStreamCommandServer = grpc.BidiStreamingServer[CommandArgument, CommandReturn]
+
+// CommandController_ServiceDesc is the grpc.ServiceDesc for CommandController service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var CommandController_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "proto.CommandController",
+	HandlerType: (*CommandControllerServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "AddCommand",
+			Handler:    _CommandController_AddCommand_Handler,
+		},
+		{
+			MethodName: "RemoveCommand",
+			Handler:    _CommandController_RemoveCommand_Handler,
+		},
+		{
+			MethodName: "SendCommand",
+			Handler:    _CommandController_SendCommand_Handler,
+		},
+	},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "SendStreamCommand",
+			Handler:       _CommandController_SendStreamCommand_Handler,
+			ServerStreams: true,
+			ClientStreams: true,
+		},
+	},
+	Metadata: "command.proto",
+}