[wip] base options, command, service

.gitignore

@@ -0,0 +1 @@
+.idea

example/example.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	service2 "gitlab.bertha.cloud/partitio/grpc-service/service"
+)
+
+type GreeterHandler struct{}
+
+func hello(name string) string {
+	return fmt.Sprintf("Hello %s !", name)
+}
+
+func (g *GreeterHandler) SayHello(ctx context.Context, req *HelloRequest) (*HelloReply, error) {
+	return &HelloReply{Message: hello(req.Name)}, nil
+}
+
+func (g *GreeterHandler) SayHelloStream(req *HelloStreamRequest, s Greeter_SayHelloStreamServer) error {
+	for i := int64(0); i < req.Count; i++ {
+		if err := s.Send(&HelloReply{Message: hello(req.Name)}); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func main() {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	var svc service2.Service
+	var err error
+	svc, err = service2.New(
+		service2.WithContext(ctx),
+		service2.WithName("Greeting"),
+		service2.WithAfterStart(func() error {
+			fmt.Println("Server listening on", svc.Options().Address())
+			return nil
+		}),
+		service2.WithAfterStop(func() error {
+			fmt.Println("Stopping server")
+			return nil
+		}),
+	)
+	if err != nil {
+		panic(err)
+	}
+	RegisterGreeterServer(svc.Server(), &GreeterHandler{})
+	if err := svc.Start(); err != nil {
+		panic(err)
+	}
+}

example/example.pb.go

@@ -0,0 +1,319 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: example.proto
+
+package main
+
+import (
+	context "context"
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+type HelloRequest struct {
+	Name                 string   `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *HelloRequest) Reset()         { *m = HelloRequest{} }
+func (m *HelloRequest) String() string { return proto.CompactTextString(m) }
+func (*HelloRequest) ProtoMessage()    {}
+func (*HelloRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_15a1dc8d40dadaa6, []int{0}
+}
+
+func (m *HelloRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_HelloRequest.Unmarshal(m, b)
+}
+func (m *HelloRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HelloRequest.Marshal(b, m, deterministic)
+}
+func (m *HelloRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HelloRequest.Merge(m, src)
+}
+func (m *HelloRequest) XXX_Size() int {
+	return xxx_messageInfo_HelloRequest.Size(m)
+}
+func (m *HelloRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_HelloRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HelloRequest proto.InternalMessageInfo
+
+func (m *HelloRequest) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+type HelloReply struct {
+	Message              string   `protobuf:"bytes,1,opt,name=message,proto3" json:"message,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *HelloReply) Reset()         { *m = HelloReply{} }
+func (m *HelloReply) String() string { return proto.CompactTextString(m) }
+func (*HelloReply) ProtoMessage()    {}
+func (*HelloReply) Descriptor() ([]byte, []int) {
+	return fileDescriptor_15a1dc8d40dadaa6, []int{1}
+}
+
+func (m *HelloReply) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_HelloReply.Unmarshal(m, b)
+}
+func (m *HelloReply) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HelloReply.Marshal(b, m, deterministic)
+}
+func (m *HelloReply) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HelloReply.Merge(m, src)
+}
+func (m *HelloReply) XXX_Size() int {
+	return xxx_messageInfo_HelloReply.Size(m)
+}
+func (m *HelloReply) XXX_DiscardUnknown() {
+	xxx_messageInfo_HelloReply.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HelloReply proto.InternalMessageInfo
+
+func (m *HelloReply) GetMessage() string {
+	if m != nil {
+		return m.Message
+	}
+	return ""
+}
+
+type HelloStreamRequest struct {
+	Name                 string   `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Count                int64    `protobuf:"varint,2,opt,name=count,proto3" json:"count,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *HelloStreamRequest) Reset()         { *m = HelloStreamRequest{} }
+func (m *HelloStreamRequest) String() string { return proto.CompactTextString(m) }
+func (*HelloStreamRequest) ProtoMessage()    {}
+func (*HelloStreamRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_15a1dc8d40dadaa6, []int{2}
+}
+
+func (m *HelloStreamRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_HelloStreamRequest.Unmarshal(m, b)
+}
+func (m *HelloStreamRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HelloStreamRequest.Marshal(b, m, deterministic)
+}
+func (m *HelloStreamRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HelloStreamRequest.Merge(m, src)
+}
+func (m *HelloStreamRequest) XXX_Size() int {
+	return xxx_messageInfo_HelloStreamRequest.Size(m)
+}
+func (m *HelloStreamRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_HelloStreamRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HelloStreamRequest proto.InternalMessageInfo
+
+func (m *HelloStreamRequest) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+func (m *HelloStreamRequest) GetCount() int64 {
+	if m != nil {
+		return m.Count
+	}
+	return 0
+}
+
+func init() {
+	proto.RegisterType((*HelloRequest)(nil), "helloworld.HelloRequest")
+	proto.RegisterType((*HelloReply)(nil), "helloworld.HelloReply")
+	proto.RegisterType((*HelloStreamRequest)(nil), "helloworld.HelloStreamRequest")
+}
+
+func init() { proto.RegisterFile("example.proto", fileDescriptor_15a1dc8d40dadaa6) }
+
+var fileDescriptor_15a1dc8d40dadaa6 = []byte{
+	// 208 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0xe2, 0x4d, 0xad, 0x48, 0xcc,
+	0x2d, 0xc8, 0x49, 0xd5, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0xe2, 0xca, 0x48, 0xcd, 0xc9, 0xc9,
+	0x2f, 0xcf, 0x2f, 0xca, 0x49, 0x51, 0x52, 0xe2, 0xe2, 0xf1, 0x00, 0xf1, 0x82, 0x52, 0x0b, 0x4b,
+	0x53, 0x8b, 0x4b, 0x84, 0x84, 0xb8, 0x58, 0xf2, 0x12, 0x73, 0x53, 0x25, 0x18, 0x15, 0x18, 0x35,
+	0x38, 0x83, 0xc0, 0x6c, 0x25, 0x35, 0x2e, 0x2e, 0xa8, 0x9a, 0x82, 0x9c, 0x4a, 0x21, 0x09, 0x2e,
+	0xf6, 0xdc, 0xd4, 0xe2, 0xe2, 0xc4, 0x74, 0x98, 0x22, 0x18, 0x57, 0xc9, 0x8e, 0x4b, 0x08, 0xac,
+	0x2e, 0xb8, 0xa4, 0x28, 0x35, 0x31, 0x17, 0x8f, 0x89, 0x42, 0x22, 0x5c, 0xac, 0xc9, 0xf9, 0xa5,
+	0x79, 0x25, 0x12, 0x4c, 0x0a, 0x8c, 0x1a, 0xcc, 0x41, 0x10, 0x8e, 0xd1, 0x74, 0x46, 0x2e, 0x76,
+	0xf7, 0xa2, 0xd4, 0xd4, 0x92, 0xd4, 0x22, 0x21, 0x3b, 0x2e, 0x8e, 0xe0, 0xc4, 0x4a, 0xb0, 0x71,
+	0x42, 0x12, 0x7a, 0x08, 0x07, 0xeb, 0x21, 0xbb, 0x56, 0x4a, 0x0c, 0x8b, 0x4c, 0x41, 0x4e, 0xa5,
+	0x12, 0x83, 0x90, 0x0f, 0x17, 0x1f, 0x4c, 0x3f, 0xc4, 0x39, 0x42, 0x72, 0x18, 0x6a, 0x51, 0xdc,
+	0x89, 0xdb, 0x2c, 0x03, 0x46, 0x27, 0xb6, 0x28, 0x96, 0xdc, 0xc4, 0xcc, 0xbc, 0x24, 0x36, 0x70,
+	0x00, 0x1a, 0x03, 0x02, 0x00, 0x00, 0xff, 0xff, 0xd0, 0x30, 0x8a, 0x2d, 0x51, 0x01, 0x00, 0x00,
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// GreeterClient is the client API for Greeter service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
+type GreeterClient interface {
+	SayHello(ctx context.Context, in *HelloRequest, opts ...grpc.CallOption) (*HelloReply, error)
+	SayHelloStream(ctx context.Context, in *HelloStreamRequest, opts ...grpc.CallOption) (Greeter_SayHelloStreamClient, error)
+}
+
+type greeterClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewGreeterClient(cc *grpc.ClientConn) 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, "/helloworld.Greeter/SayHello", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *greeterClient) SayHelloStream(ctx context.Context, in *HelloStreamRequest, opts ...grpc.CallOption) (Greeter_SayHelloStreamClient, error) {
+	stream, err := c.cc.NewStream(ctx, &_Greeter_serviceDesc.Streams[0], "/helloworld.Greeter/SayHelloStream", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &greeterSayHelloStreamClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type Greeter_SayHelloStreamClient interface {
+	Recv() (*HelloReply, error)
+	grpc.ClientStream
+}
+
+type greeterSayHelloStreamClient struct {
+	grpc.ClientStream
+}
+
+func (x *greeterSayHelloStreamClient) Recv() (*HelloReply, error) {
+	m := new(HelloReply)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// GreeterServer is the server API for Greeter service.
+type GreeterServer interface {
+	SayHello(context.Context, *HelloRequest) (*HelloReply, error)
+	SayHelloStream(*HelloStreamRequest, Greeter_SayHelloStreamServer) error
+}
+
+// UnimplementedGreeterServer can be embedded to have forward compatible implementations.
+type UnimplementedGreeterServer struct {
+}
+
+func (*UnimplementedGreeterServer) SayHello(ctx context.Context, req *HelloRequest) (*HelloReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SayHello not implemented")
+}
+func (*UnimplementedGreeterServer) SayHelloStream(req *HelloStreamRequest, srv Greeter_SayHelloStreamServer) error {
+	return status.Errorf(codes.Unimplemented, "method SayHelloStream not implemented")
+}
+
+func RegisterGreeterServer(s *grpc.Server, 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: "/helloworld.Greeter/SayHello",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(GreeterServer).SayHello(ctx, req.(*HelloRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Greeter_SayHelloStream_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(HelloStreamRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(GreeterServer).SayHelloStream(m, &greeterSayHelloStreamServer{stream})
+}
+
+type Greeter_SayHelloStreamServer interface {
+	Send(*HelloReply) error
+	grpc.ServerStream
+}
+
+type greeterSayHelloStreamServer struct {
+	grpc.ServerStream
+}
+
+func (x *greeterSayHelloStreamServer) Send(m *HelloReply) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+var _Greeter_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "helloworld.Greeter",
+	HandlerType: (*GreeterServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "SayHello",
+			Handler:    _Greeter_SayHello_Handler,
+		},
+	},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "SayHelloStream",
+			Handler:       _Greeter_SayHelloStream_Handler,
+			ServerStreams: true,
+		},
+	},
+	Metadata: "example.proto",
+}

example/example.proto

@@ -0,0 +1,23 @@
+syntax = "proto3";
+
+package helloworld;
+
+option go_package = "main";
+
+service Greeter {
+    rpc SayHello (HelloRequest) returns (HelloReply) {}
+    rpc SayHelloStream (HelloStreamRequest) returns (stream HelloReply) {}
+}
+
+message HelloRequest {
+    string name = 1;
+}
+
+message HelloReply {
+    string message = 1;
+}
+
+message HelloStreamRequest {
+    string name = 1;
+    int64 count = 2;
+}

go.mod

@@ -0,0 +1,14 @@
+module gitlab.bertha.cloud/partitio/grpc-service
+
+go 1.13
+
+require (
+	github.com/golang/protobuf v1.3.2
+	github.com/grpc-ecosystem/go-grpc-middleware v1.1.0
+	github.com/jinzhu/gorm v1.9.12
+	github.com/nats-io/stan.go v0.6.0 // indirect
+	github.com/spf13/cobra v0.0.5
+	github.com/spf13/pflag v1.0.3
+	github.com/spf13/viper v1.6.2
+	google.golang.org/grpc v1.26.0
+)

go.sum

@@ -0,0 +1,214 @@
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service/command.go

@@ -0,0 +1,41 @@
+package service
+
+import (
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var cmd = &cobra.Command{
+	Short: "A gRPC micro service",
+}
+
+const (
+	caCert = "ca_cert"
+	serverAddress = "server_address"
+	serverCert = "server_cert"
+	serverKey = "server_key"
+)
+
+func init() {
+	viper.AutomaticEnv()
+	// server_address
+	cmd.Flags().String(serverAddress, "0.0.0.0:0", "Bind address for the server. 127.0.0.1:9090 [$SERVER_ADDRESS]")
+	viper.BindPFlag(serverAddress, cmd.Flags().Lookup(serverAddress))
+	// ca_cert
+	cmd.Flags().String(caCert, "", "Path to Root CA certificate [$CA_CERT]")
+	viper.BindPFlag(caCert, cmd.Flags().Lookup(caCert))
+	// server_cert
+	cmd.Flags().String(serverCert, "", "Path to Server certificate [$SERVER_CERT]")
+	viper.BindPFlag(serverCert, cmd.Flags().Lookup(serverCert))
+	// server_key
+	cmd.Flags().String(serverKey, "", "Path to Server key [$SERVER_KEY]")
+	viper.BindPFlag(serverKey, cmd.Flags().Lookup(serverKey))
+}
+
+func parseFlags(o *options) *options {
+	o.address = viper.GetString(serverAddress)
+	o.caCert = viper.GetString(caCert)
+	o.cert = viper.GetString(serverCert)
+	o.key = viper.GetString(serverKey)
+	return o
+}

service/options.go

@@ -0,0 +1,337 @@
+package service
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io/ioutil"
+	"reflect"
+
+	"github.com/jinzhu/gorm"
+	"google.golang.org/grpc"
+)
+
+/*
+GLOBAL OPTIONS:
+   	--client value                  Client for go-micro; rpc [$MICRO_CLIENT]
+   	--client_request_timeout value  Sets the client request timeout. e.g 500ms, 5s, 1m. Default: 5s [$MICRO_CLIENT_REQUEST_TIMEOUT]
+   	--client_retries value          Sets the client retries. Default: 1 (default: 1) [$MICRO_CLIENT_RETRIES]
+   	--client_pool_size value        Sets the client connection pool size. Default: 1 (default: 0) [$MICRO_CLIENT_POOL_SIZE]
+   	--client_pool_ttl value         Sets the client connection pool ttl. e.g 500ms, 5s, 1m. Default: 1m [$MICRO_CLIENT_POOL_TTL]
+   	--register_ttl value            Register TTL in seconds (default: 0) [$MICRO_REGISTER_TTL]
+   	--register_interval value       Register interval in seconds (default: 0) [$MICRO_REGISTER_INTERVAL]
+   	--server value                  Server for go-micro; rpc [$MICRO_SERVER]
+   	--server_name value             Name of the server. go.micro.srv.example [$MICRO_SERVER_NAME]
+   	--server_version value          Version of the server. 1.1.0 [$MICRO_SERVER_VERSION]
+   	--server_id value               Id of the server. Auto-generated if not specified [$MICRO_SERVER_ID]
+   	--server_address value          Bind address for the server. 127.0.0.1:8080 [$MICRO_SERVER_ADDRESS]
+   	--server_advertise value        Used instead of the server_address when registering with discovery. 127.0.0.1:8080 [$MICRO_SERVER_ADVERTISE]
+   	--server_metadata value         A list of key-value pairs defining metadata. version=1.0.0 [$MICRO_SERVER_METADATA]
+   	--broker value                  Broker for pub/sub. http, nats, rabbitmq [$MICRO_BROKER]
+   	--broker_address value          Comma-separated list of broker addresses [$MICRO_BROKER_ADDRESS]
+   	--registry value                Registry for discovery. consul, mdns [$MICRO_REGISTRY]
+   	--registry_address value        Comma-separated list of registry addresses [$MICRO_REGISTRY_ADDRESS]
+   	--selector value                Selector used to pick nodes for querying [$MICRO_SELECTOR]
+   	--transport value               Transport mechanism used; http [$MICRO_TRANSPORT]
+   	--transport_address value       Comma-separated list of transport addresses [$MICRO_TRANSPORT_ADDRESS]
+   	--db_path value                 Path to sqlite db (e.g. /data/agents.db) (default: "agents.db") [$DB_PATH]
+   	--help, -h                      show help
+
+   	--register_ttl            REGISTER_TTL
+   	--register_interval       REGISTER_INTERVAL
+   	--server_name             SERVER_NAME
+   	--server_version          SERVER_VERSION
+   	--server_id               SERVER_ID
+   	--server_advertise        SERVER_ADVERTISE
+   	--broker                  BROKER
+   	--broker_address          BROKER_ADDRESS
+   	--registry                REGISTRY
+   	--registry_address        REGISTRY_ADDRESS
+   	--selector                SELECTOR
+   	--transport               TRANSPORT
+   	--transport_address       TRANSPORT_ADDRESS
+   	--db_path                 DB_PATH
+
+	--server_address          SERVER_ADDRESS
+   	--ca_cert				  CA_CERT
+	--server_cert			  SERVER_CERT
+    --server_key			  SERVER_KEY
+*/
+
+type Options interface {
+	Context() context.Context
+	Name() string
+	Address() string
+	CACert() string
+	Cert() string
+	Key() string
+	TLSConfig() tls.Config
+	DB() *gorm.DB
+	BeforeStart() []func() error
+	AfterStart() []func() error
+	BeforeStop() []func() error
+	AfterStop() []func() error
+	ServerOpts() []grpc.ServerOption
+	ServerInterceptors() []grpc.UnaryServerInterceptor
+	StreamServerInterceptors() []grpc.StreamServerInterceptor
+	ClientInterceptors() []grpc.UnaryClientInterceptor
+	StreamClientInterceptors() []grpc.StreamClientInterceptor
+	Defaults()
+}
+
+func NewOptions() *options {
+	return &options{
+		ctx:     context.Background(),
+		address: ":0",
+	}
+}
+
+func (o *options) Defaults() {
+	if o.ctx == nil {
+		o.ctx = context.Background()
+	}
+	if o.address == "" {
+		o.address = "0.0.0.0:0"
+	}
+}
+
+type Option func(*options)
+
+func WithName(name string) Option {
+	return func(o *options) {
+		o.name = name
+	}
+}
+
+// Context specifies a context for the service.
+// Can be used to signal shutdown of the service.
+// Can be used for extra option values.
+func WithContext(ctx context.Context) Option {
+	return func(o *options) {
+		o.ctx = ctx
+	}
+}
+
+// Address sets the address of the server
+func WithAddress(addr string) Option {
+	return func(o *options) {
+		o.address = addr
+	}
+}
+
+func WithGRPCServerOpts(opts ...grpc.ServerOption) Option {
+	return func(o *options) {
+		o.serverOpts = append(o.serverOpts, opts...)
+	}
+}
+
+func WithCACert(path string) Option {
+	return func(o *options) {
+		o.caCert = path
+	}
+}
+
+func WithCert(path string) Option {
+	return func(o *options) {
+		o.cert = path
+	}
+}
+
+func WithKey(path string) Option {
+	return func(o *options) {
+		o.key = path
+	}
+}
+
+func WithDB(db *gorm.DB) Option {
+	return func(o *options) {
+		o.db = db
+	}
+}
+
+func WithTLSConfig(conf *tls.Config) Option {
+	return func(o *options) {
+		if conf != nil {
+			o.tlsConfig = *conf
+		}
+	}
+}
+
+func WithBeforeStart(fn ...func() error) Option {
+	return func(o *options) {
+		o.beforeStart = append(o.beforeStart, fn...)
+	}
+}
+
+func WithBeforeStop(fn ...func() error) Option {
+	return func(o *options) {
+		o.beforeStop = append(o.beforeStop, fn...)
+	}
+}
+
+func WithAfterStart(fn ...func() error) Option {
+	return func(o *options) {
+		o.afterStart = append(o.afterStart, fn...)
+	}
+}
+
+func WithAfterStop(fn ...func() error) Option {
+	return func(o *options) {
+		o.afterStop = append(o.afterStop, fn...)
+	}
+}
+
+func WithUnaryClientInterceptor(i ...grpc.UnaryClientInterceptor) Option {
+	return func(o *options) {
+		o.clientInterceptors = append(o.clientInterceptors, i...)
+	}
+}
+
+// WrapHandler adds a handler Wrapper to a list of options passed into the server
+func WithUnaryServerInterceptor(i ...grpc.UnaryServerInterceptor) Option {
+	return func(o *options) {
+		o.serverInterceptors = append(o.serverInterceptors, i...)
+	}
+}
+
+func WithStreamServerInterceptor(i ...grpc.StreamServerInterceptor) Option {
+	return func(o *options) {
+		o.streamServerInterceptors = append(o.streamServerInterceptors, i...)
+	}
+}
+
+func WithStreamClientInterceptor(i ...grpc.StreamClientInterceptor) Option {
+	return func(o *options) {
+		o.streamClientInterceptors = append(o.streamClientInterceptors, i...)
+	}
+}
+
+// WrapSubscriber adds a subscriber Wrapper to a list of options passed into the server
+func WithSubscriberInterceptor(w ...interface{}) Option {
+	return func(o *options) {
+
+	}
+}
+
+type options struct {
+	ctx       context.Context
+	name      string
+	address   string
+	caCert    string
+	cert      string
+	key       string
+	tlsConfig tls.Config
+	db        *gorm.DB
+
+	beforeStart []func() error
+	afterStart  []func() error
+	beforeStop  []func() error
+	afterStop   []func() error
+
+	serverOpts []grpc.ServerOption
+
+	serverInterceptors       []grpc.UnaryServerInterceptor
+	streamServerInterceptors []grpc.StreamServerInterceptor
+
+	clientInterceptors       []grpc.UnaryClientInterceptor
+	streamClientInterceptors []grpc.StreamClientInterceptor
+}
+
+func (o *options) Name() string {
+	return o.name
+}
+
+func (o *options) Context() context.Context {
+	return o.ctx
+}
+
+func (o *options) Address() string {
+	return o.address
+}
+
+func (o *options) CACert() string {
+	return o.caCert
+}
+
+func (o *options) Cert() string {
+	return o.cert
+}
+
+func (o *options) Key() string {
+	return o.key
+}
+
+func (o *options) TLSConfig() tls.Config {
+	return o.tlsConfig
+}
+
+func (o *options) DB() *gorm.DB {
+	return o.db
+}
+
+func (o *options) BeforeStart() []func() error {
+	return o.beforeStart
+}
+
+func (o *options) AfterStart() []func() error {
+	return o.afterStart
+}
+
+func (o *options) BeforeStop() []func() error {
+	return o.beforeStop
+}
+
+func (o *options) AfterStop() []func() error {
+	return o.afterStop
+}
+
+func (o *options) ServerOpts() []grpc.ServerOption {
+	return o.serverOpts
+}
+
+func (o *options) ServerInterceptors() []grpc.UnaryServerInterceptor {
+	return o.serverInterceptors
+}
+
+func (o *options) StreamServerInterceptors() []grpc.StreamServerInterceptor {
+	return o.streamServerInterceptors
+}
+
+func (o *options) ClientInterceptors() []grpc.UnaryClientInterceptor {
+	return o.clientInterceptors
+}
+
+func (o *options) StreamClientInterceptors() []grpc.StreamClientInterceptor {
+	return o.streamClientInterceptors
+}
+
+func (o *options) parseTLSConfig() error {
+	if o.hasTLSConfig() {
+		return nil
+	}
+	caCert, err := ioutil.ReadFile(o.caCert)
+	if err != nil {
+		return err
+	}
+	caCertPool := x509.NewCertPool()
+	ok := caCertPool.AppendCertsFromPEM(caCert)
+	if !ok {
+		return fmt.Errorf("failed to load CA Cert from %s", o.caCert)
+	}
+	cert, err := tls.LoadX509KeyPair(o.cert, o.key)
+	if err != nil {
+		return err
+	}
+	o.tlsConfig = tls.Config{
+		ClientAuth:   tls.RequireAndVerifyClientCert,
+		ClientCAs:    caCertPool,
+		RootCAs:      caCertPool,
+		Certificates: []tls.Certificate{cert},
+	}
+	return nil
+}
+
+func (o *options) hasTLSConfig() bool {
+	return reflect.DeepEqual(o.tlsConfig, tls.Config{})
+}

service/service.go

@@ -0,0 +1,148 @@
+package service
+
+import (
+	"net"
+	"os"
+	"sync"
+
+	grpcmiddleware "github.com/grpc-ecosystem/go-grpc-middleware"
+	"github.com/jinzhu/gorm"
+	"github.com/spf13/cobra"
+	"google.golang.org/grpc"
+)
+
+type Service interface {
+	Options() Options
+	Server() *grpc.Server
+	DB() *gorm.DB
+	Start() error
+	Stop() error
+	Close() error
+	Cmd() *cobra.Command
+}
+
+func New(opts ...Option) (Service, error) {
+	return newService(opts...)
+}
+
+type service struct {
+	cmd    *cobra.Command
+	opts   *options
+	server *grpc.Server
+	list   net.Listener
+	mu     sync.Mutex
+	running bool
+}
+
+func newService(opts ...Option) (*service, error) {
+	cmd.ParseFlags(os.Args)
+	s := &service{
+		opts: parseFlags(NewOptions()),
+		cmd:  cmd,
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	for _, f := range opts {
+		f(s.opts)
+	}
+	go func() {
+		for {
+			select {
+			case <-s.opts.ctx.Done():
+				s.Stop()
+			}
+		}
+	}()
+	if err := s.opts.parseTLSConfig(); err != nil {
+		return nil, err
+	}
+	cmd.Use = s.opts.name
+	cmd.RunE = func(cmd *cobra.Command, args []string) error {
+		if cmd.Use == "" {
+			cmd.Use = os.Args[0]
+		}
+		return s.run()
+	}
+	gopts := []grpc.ServerOption{grpc.UnaryInterceptor(grpcmiddleware.ChainUnaryServer(s.opts.serverInterceptors...))}
+	// TODO : check tls config and tls auth
+	// grpc.Creds(credentials.NewTLS(&s.opts.tlsConfig))
+	s.server = grpc.NewServer(append(gopts, s.opts.serverOpts...)...)
+	return s, nil
+}
+
+func (s *service) Options() Options {
+	return s.opts
+}
+
+func (s *service) DB() *gorm.DB {
+	return s.opts.db
+}
+
+func (s *service) Server() *grpc.Server {
+	return s.server
+}
+
+func (s *service) Cmd() *cobra.Command {
+	return s.cmd
+}
+
+func (s *service) run() error {
+	s.mu.Lock()
+	for i := range s.opts.beforeStart {
+		if err := s.opts.beforeStart[i](); err != nil {
+			return err
+		}
+	}
+	var err error
+	s.running = true
+	s.list, err = net.Listen("tcp", s.opts.address)
+	if err != nil {
+		s.mu.Unlock()
+		return err
+	}
+	s.opts.address = s.list.Addr().String()
+	errs := make(chan error)
+	go func() {
+		errs <- s.server.Serve(s.list)
+	}()
+	for i := range s.opts.afterStart {
+		if err := s.opts.afterStart[i](); err != nil {
+			s.mu.Unlock()
+			s.Stop()
+			return err
+		}
+	}
+	s.mu.Unlock()
+	return <- errs
+}
+
+func (s *service) Start() error {
+	return s.cmd.Execute()
+}
+
+func (s *service) Stop() error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if ! s.running {
+		return nil
+	}
+	for i := range s.opts.beforeStop {
+		if err := s.opts.beforeStop[i](); err != nil {
+			return err
+		}
+	}
+	s.server.GracefulStop()
+	s.running = false
+	for i := range s.opts.afterStop {
+		if err := s.opts.afterStop[i](); err != nil {
+
+		}
+	}
+	return nil
+}
+
+func (s *service) Close() error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.Stop()
+}