Added basic keygen grpc server

api/keygen/keygen.pb.go

@@ -0,0 +1,169 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.35.1
+// 	protoc        v5.28.2
+// source: keygen.proto
+
+package keygen
+
+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 Empty struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *Empty) Reset() {
+	*x = Empty{}
+	mi := &file_keygen_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Empty) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Empty) ProtoMessage() {}
+
+func (x *Empty) ProtoReflect() protoreflect.Message {
+	mi := &file_keygen_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 Empty.ProtoReflect.Descriptor instead.
+func (*Empty) Descriptor() ([]byte, []int) {
+	return file_keygen_proto_rawDescGZIP(), []int{0}
+}
+
+type Key struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Value string `protobuf:"bytes,1,opt,name=value,proto3" json:"value,omitempty"`
+}
+
+func (x *Key) Reset() {
+	*x = Key{}
+	mi := &file_keygen_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Key) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Key) ProtoMessage() {}
+
+func (x *Key) ProtoReflect() protoreflect.Message {
+	mi := &file_keygen_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 Key.ProtoReflect.Descriptor instead.
+func (*Key) Descriptor() ([]byte, []int) {
+	return file_keygen_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *Key) GetValue() string {
+	if x != nil {
+		return x.Value
+	}
+	return ""
+}
+
+var File_keygen_proto protoreflect.FileDescriptor
+
+var file_keygen_proto_rawDesc = []byte{
+	0x0a, 0x0c, 0x6b, 0x65, 0x79, 0x67, 0x65, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x06,
+	0x6b, 0x65, 0x79, 0x67, 0x65, 0x6e, 0x22, 0x07, 0x0a, 0x05, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22,
+	0x1b, 0x0a, 0x03, 0x4b, 0x65, 0x79, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18,
+	0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x32, 0x35, 0x0a, 0x06,
+	0x4b, 0x65, 0x79, 0x67, 0x65, 0x6e, 0x12, 0x2b, 0x0a, 0x0b, 0x47, 0x65, 0x6e, 0x65, 0x72, 0x61,
+	0x74, 0x65, 0x4b, 0x65, 0x79, 0x12, 0x0d, 0x2e, 0x6b, 0x65, 0x79, 0x67, 0x65, 0x6e, 0x2e, 0x45,
+	0x6d, 0x70, 0x74, 0x79, 0x1a, 0x0b, 0x2e, 0x6b, 0x65, 0x79, 0x67, 0x65, 0x6e, 0x2e, 0x4b, 0x65,
+	0x79, 0x22, 0x00, 0x42, 0x19, 0x5a, 0x17, 0x66, 0x61, 0x73, 0x74, 0x62, 0x69, 0x6e, 0x2f, 0x69,
+	0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x6b, 0x65, 0x79, 0x67, 0x65, 0x6e, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_keygen_proto_rawDescOnce sync.Once
+	file_keygen_proto_rawDescData = file_keygen_proto_rawDesc
+)
+
+func file_keygen_proto_rawDescGZIP() []byte {
+	file_keygen_proto_rawDescOnce.Do(func() {
+		file_keygen_proto_rawDescData = protoimpl.X.CompressGZIP(file_keygen_proto_rawDescData)
+	})
+	return file_keygen_proto_rawDescData
+}
+
+var file_keygen_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_keygen_proto_goTypes = []any{
+	(*Empty)(nil), // 0: keygen.Empty
+	(*Key)(nil),   // 1: keygen.Key
+}
+var file_keygen_proto_depIdxs = []int32{
+	0, // 0: keygen.Keygen.GenerateKey:input_type -> keygen.Empty
+	1, // 1: keygen.Keygen.GenerateKey:output_type -> keygen.Key
+	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_keygen_proto_init() }
+func file_keygen_proto_init() {
+	if File_keygen_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_keygen_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_keygen_proto_goTypes,
+		DependencyIndexes: file_keygen_proto_depIdxs,
+		MessageInfos:      file_keygen_proto_msgTypes,
+	}.Build()
+	File_keygen_proto = out.File
+	file_keygen_proto_rawDesc = nil
+	file_keygen_proto_goTypes = nil
+	file_keygen_proto_depIdxs = nil
+}

api/keygen/keygen.proto

@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+option go_package = "fastbin/internal/keygen";
+
+package keygen;
+
+service Keygen {
+    rpc GenerateKey(Empty) returns (Key) {}
+}
+
+message Empty {}
+
+message Key {
+    string value = 1;
+}

api/keygen/keygen_grpc.pb.go

@@ -0,0 +1,121 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.5.1
+// - protoc             v5.28.2
+// source: keygen.proto
+
+package keygen
+
+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 (
+	Keygen_GenerateKey_FullMethodName = "/keygen.Keygen/GenerateKey"
+)
+
+// KeygenClient is the client API for Keygen 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 KeygenClient interface {
+	GenerateKey(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*Key, error)
+}
+
+type keygenClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewKeygenClient(cc grpc.ClientConnInterface) KeygenClient {
+	return &keygenClient{cc}
+}
+
+func (c *keygenClient) GenerateKey(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*Key, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(Key)
+	err := c.cc.Invoke(ctx, Keygen_GenerateKey_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// KeygenServer is the server API for Keygen service.
+// All implementations must embed UnimplementedKeygenServer
+// for forward compatibility.
+type KeygenServer interface {
+	GenerateKey(context.Context, *Empty) (*Key, error)
+	mustEmbedUnimplementedKeygenServer()
+}
+
+// UnimplementedKeygenServer 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 UnimplementedKeygenServer struct{}
+
+func (UnimplementedKeygenServer) GenerateKey(context.Context, *Empty) (*Key, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GenerateKey not implemented")
+}
+func (UnimplementedKeygenServer) mustEmbedUnimplementedKeygenServer() {}
+func (UnimplementedKeygenServer) testEmbeddedByValue()                {}
+
+// UnsafeKeygenServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to KeygenServer will
+// result in compilation errors.
+type UnsafeKeygenServer interface {
+	mustEmbedUnimplementedKeygenServer()
+}
+
+func RegisterKeygenServer(s grpc.ServiceRegistrar, srv KeygenServer) {
+	// If the following call pancis, it indicates UnimplementedKeygenServer 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(&Keygen_ServiceDesc, srv)
+}
+
+func _Keygen_GenerateKey_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Empty)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(KeygenServer).GenerateKey(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: Keygen_GenerateKey_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(KeygenServer).GenerateKey(ctx, req.(*Empty))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// Keygen_ServiceDesc is the grpc.ServiceDesc for Keygen service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var Keygen_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "keygen.Keygen",
+	HandlerType: (*KeygenServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GenerateKey",
+			Handler:    _Keygen_GenerateKey_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "keygen.proto",
+}

cmd/api-server/main.go

@@ -7,7 +7,8 @@ import (
 )
 
 func main() {
-	server := apiserver.NewAPIServer(8080)
+	port := 8080
+	server := apiserver.NewAPIServer(port)
 	err := server.ListenAndServe()
 	if err != nil && err != http.ErrServerClosed {
 		panic(fmt.Sprintf("http server error: %s", err))

cmd/keygen/main.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	keygen "fastbin/internal/keygen"
+	"fmt"
+	"log"
+	"net"
+)
+
+func main() {
+	port := 8081
+	lis, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+	err = keygen.NewKeygenServer().Serve(lis)
+	if err != nil {
+		log.Fatalf("grpc server error: %v", err)
+	}
+}

go.mod

@@ -2,7 +2,11 @@ module fastbin
 
 go 1.23.2
 
-require github.com/gin-gonic/gin v1.10.0
+require (
+	github.com/gin-gonic/gin v1.10.0
+	google.golang.org/grpc v1.67.1
+	google.golang.org/protobuf v1.34.2
+)
 
 require (
 	github.com/bytedance/sonic v1.11.6 // indirect
@@ -25,10 +29,10 @@ require (
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.12 // indirect
 	golang.org/x/arch v0.8.0 // indirect
-	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/crypto v0.26.0 // indirect
-	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/net v0.28.0 // indirect
-	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/sys v0.24.0 // indirect
-	golang.org/x/text v0.15.0 // indirect
+	golang.org/x/text v0.17.0 // indirect
-	google.golang.org/protobuf v1.34.1 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -25,8 +25,8 @@ github.com/go-playground/validator/v10 v10.20.0 h1:K9ISHbSaI0lyB2eWMPJo+kOS/FBEx
 github.com/go-playground/validator/v10 v10.20.0/go.mod h1:dbuPbCMFw/DrkbEynArYaCwl3amGuJotoKCe95atGMM=
 github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
 github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
-github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
 github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
@@ -66,20 +66,22 @@ github.com/ugorji/go/codec v1.2.12/go.mod h1:UNopzCgEMSXjBc6AOMqYvWC1ktqTAfzJZUZ
 golang.org/x/arch v0.0.0-20210923205945-b76863e36670/go.mod h1:5om86z9Hs0C8fWVUuoMHwpExlXzs5Tkyp9hOrfG7pp8=
 golang.org/x/arch v0.8.0 h1:3wRIsP3pM4yUptoR96otTUOXI367OS0+c9eeRi9doIc=
 golang.org/x/arch v0.8.0/go.mod h1:FEVrYAQjsQXMVJ1nsMoVVXPZg6p2JE2mx8psSWTDQys=
-golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=
+golang.org/x/crypto v0.26.0 h1:RrRspgV4mU+YwB4FYnuBoKsUapNIL5cohGAmSH3azsw=
-golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
+golang.org/x/crypto v0.26.0/go.mod h1:GY7jblb9wI+FOo5y8/S2oY4zWP07AkOJ4+jxCqdqn54=
-golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
+golang.org/x/net v0.28.0 h1:a9JDOJc5GMUJ0+UDqmLT86WiEy7iWyIhz8gz8E4e5hE=
-golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
+golang.org/x/net v0.28.0/go.mod h1:yqtgsTWOOnlGLG9GFRrK3++bGOUEkNBoHZc8MEDWPNg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.24.0 h1:Twjiwq9dn6R1fQcyiK+wQyHWfaz/BJB+YIpzU/Cv3Xg=
-golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.24.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
+golang.org/x/text v0.17.0 h1:XtiM5bkSOt+ewxlOE/aE/AKEHibwj/6gvWMl9Rsh0Qc=
-golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.17.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 h1:e7S5W7MGGLaSu8j3YjdezkZ+m1/Nm0uRVRMEMGk26Xs=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142/go.mod h1:UqMtugtsSgubUsoxbuAoiCXvqvErP7Gf0so0mK9tHxU=
-google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
+google.golang.org/grpc v1.67.1 h1:zWnc1Vrcno+lHZCOofnIMvycFcc0QRGIzm9dhnDX68E=
-google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+google.golang.org/grpc v1.67.1/go.mod h1:1gLDyUQU7CTLJI90u3nXZ9ekeghjeM7pTDZlqFNg2AA=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/api-server/server.go

@@ -1,10 +1,17 @@
 package apiserver
 
 import (
+	"context"
 	"fmt"
+	"log"
 	"net/http"
+	"time"
+
+	pb "fastbin/api/keygen"
 
 	"github.com/gin-gonic/gin"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 )
 
 func NewAPIServer(port int) *http.Server {
@@ -19,8 +26,24 @@ func NewAPIServer(port int) *http.Server {
 	return server
 }
 
-func hello_world(c *gin.Context) {
+func hello_world(gc *gin.Context) {
-	c.JSON(http.StatusOK, gin.H{
+	grpcServerURL := "localhost:8081"
-		"message": "Hello, World",
+	conn, err := grpc.NewClient(grpcServerURL, grpc.WithTransportCredentials(insecure.NewCredentials()))
-	})
+	if err != nil {
+		log.Fatalf("did not connect: %v", err)
+	}
+	defer conn.Close()
+	c := pb.NewKeygenClient(conn)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+	r, err := c.GenerateKey(ctx, &pb.Empty{})
+	if err != nil {
+		log.Fatalf("could not greet: %v", err)
+	}
+
+	gc.JSON(http.StatusOK, gin.H{
+		"message": "Hello, World",
+		"key":     r.Value,
+	})
+
 }

internal/keygen/server.go

@@ -0,0 +1,30 @@
+package keygen
+
+import (
+	context "context"
+	"math/rand"
+
+	pb "fastbin/api/keygen"
+
+	"google.golang.org/grpc"
+)
+
+type keygenServer struct {
+	pb.UnimplementedKeygenServer
+}
+
+func (k *keygenServer) GenerateKey(ctx context.Context, req *pb.Empty) (*pb.Key, error) {
+	b := make([]byte, 6)
+	for i := range b {
+		b[i] = 'a' + byte(rand.Intn(26))
+	}
+
+	key := pb.Key{Value: string(b)}
+	return &key, nil
+}
+
+func NewKeygenServer() *grpc.Server {
+	grpcSever := grpc.NewServer()
+	pb.RegisterKeygenServer(grpcSever, &keygenServer{})
+	return grpcSever
+}