Moving to gRPC by default (#1069)

* Step 1

* Fix the test panics

client/grpc/grpc.go

@@ -12,12 +12,10 @@ import (
 	"github.com/micro/go-micro/broker"
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/client/selector"
-	"github.com/micro/go-micro/codec"
 	raw "github.com/micro/go-micro/codec/bytes"
 	"github.com/micro/go-micro/errors"
 	"github.com/micro/go-micro/metadata"
 	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/transport"
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
@@ -623,45 +621,19 @@ func (g *grpcClient) getGrpcCallOptions() []grpc.CallOption {
 }
 
 func newClient(opts ...client.Option) client.Client {
-	options := client.Options{
-		Codecs: make(map[string]codec.NewCodec),
-		CallOptions: client.CallOptions{
-			Backoff:        client.DefaultBackoff,
-			Retry:          client.DefaultRetry,
-			Retries:        client.DefaultRetries,
-			RequestTimeout: client.DefaultRequestTimeout,
-			DialTimeout:    transport.DefaultDialTimeout,
-		},
-		PoolSize: client.DefaultPoolSize,
-		PoolTTL:  client.DefaultPoolTTL,
-	}
+	options := client.NewOptions()
+	// default content type for grpc
+	options.ContentType = "application/grpc+proto"
 
 	for _, o := range opts {
 		o(&options)
 	}
 
-	if len(options.ContentType) == 0 {
-		options.ContentType = "application/grpc+proto"
-	}
-
-	if options.Broker == nil {
-		options.Broker = broker.DefaultBroker
-	}
-
-	if options.Registry == nil {
-		options.Registry = registry.DefaultRegistry
-	}
-
-	if options.Selector == nil {
-		options.Selector = selector.NewSelector(
-			selector.Registry(options.Registry),
-		)
-	}
-
 	rc := &grpcClient{
 		once: sync.Once{},
 		opts: options,
 	}
+
 	rc.pool = newPool(options.PoolSize, options.PoolTTL, rc.poolMaxIdle(), rc.poolMaxStreams())
 
 	c := client.Client(rc)

client/grpc/grpc_pool.go

@@ -70,7 +70,7 @@ func (p *pool) getConn(addr string, opts ...grpc.DialOption) (*poolConn, error)
 	p.Lock()
 	sp, ok := p.conns[addr]
 	if !ok {
-		sp = &streamsPool{head:&poolConn{}, busy:&poolConn{}, count:0, idle:0}
+		sp = &streamsPool{head: &poolConn{}, busy: &poolConn{}, count: 0, idle: 0}
 		p.conns[addr] = sp
 	}
 	//  while we have conns check streams and then return one
@@ -112,7 +112,7 @@ func (p *pool) getConn(addr string, opts ...grpc.DialOption) (*poolConn, error)
 	if err != nil {
 		return nil, err
 	}
-	conn = &poolConn{cc,nil,addr,p,sp,1,time.Now().Unix(), nil, nil, false}
+	conn = &poolConn{cc, nil, addr, p, sp, 1, time.Now().Unix(), nil, nil, false}
 
 	//  add conn to streams pool
 	p.Lock()
@@ -160,7 +160,7 @@ func (p *pool) release(addr string, conn *poolConn, err error) {
 	return
 }
 
-func (conn *poolConn)Close()  {
+func (conn *poolConn) Close() {
 	conn.pool.release(conn.addr, conn, conn.err)
 }
 

client/grpc/options.go

@@ -28,8 +28,8 @@ var (
 	DefaultMaxSendMsgSize = 1024 * 1024 * 4
 )
 
-type poolMaxStreams struct {}
-type poolMaxIdle struct {}
+type poolMaxStreams struct{}
+type poolMaxIdle struct{}
 type codecsKey struct{}
 type tlsAuth struct{}
 type maxRecvMsgSizeKey struct{}
@@ -129,4 +129,3 @@ func CallOptions(opts ...grpc.CallOption) client.CallOption {
 		o.Context = context.WithValue(o.Context, grpcCallOptions{}, opts)
 	}
 }
-

client/options.go

@@ -85,8 +85,10 @@ type RequestOptions struct {
 	Context context.Context
 }
 
-func newOptions(options ...Option) Options {
+func NewOptions(options ...Option) Options {
 	opts := Options{
+		Context:     context.Background(),
+		ContentType: DefaultContentType,
 		Codecs:      make(map[string]codec.NewCodec),
 		CallOptions: CallOptions{
 			Backoff:        DefaultBackoff,
@@ -97,38 +99,16 @@ func newOptions(options ...Option) Options {
 		},
 		PoolSize:  DefaultPoolSize,
 		PoolTTL:   DefaultPoolTTL,
+		Broker:    broker.DefaultBroker,
+		Selector:  selector.DefaultSelector,
+		Registry:  registry.DefaultRegistry,
+		Transport: transport.DefaultTransport,
 	}
 
 	for _, o := range options {
 		o(&opts)
 	}
 
-	if len(opts.ContentType) == 0 {
-		opts.ContentType = DefaultContentType
-	}
-
-	if opts.Broker == nil {
-		opts.Broker = broker.DefaultBroker
-	}
-
-	if opts.Registry == nil {
-		opts.Registry = registry.DefaultRegistry
-	}
-
-	if opts.Selector == nil {
-		opts.Selector = selector.NewSelector(
-			selector.Registry(opts.Registry),
-		)
-	}
-
-	if opts.Transport == nil {
-		opts.Transport = transport.DefaultTransport
-	}
-
-	if opts.Context == nil {
-		opts.Context = context.Background()
-	}
-
 	return opts
 }
 
@@ -171,6 +151,8 @@ func PoolTTL(d time.Duration) Option {
 func Registry(r registry.Registry) Option {
 	return func(o *Options) {
 		o.Registry = r
+		// set in the selector
+		o.Selector.Init(selector.Registry(r))
 	}
 }
 

client/options_test.go

@@ -23,7 +23,7 @@ func TestCallOptions(t *testing.T) {
 		var cl Client
 
 		if d.set {
-			opts = newOptions(
+			opts = NewOptions(
 				Retries(d.retries),
 				RequestTimeout(d.rtimeout),
 				DialTimeout(d.dtimeout),
@@ -35,7 +35,7 @@ func TestCallOptions(t *testing.T) {
 				DialTimeout(d.dtimeout),
 			)
 		} else {
-			opts = newOptions()
+			opts = NewOptions()
 			cl = NewClient()
 		}
 

client/rpc_client.go

@@ -29,7 +29,7 @@ type rpcClient struct {
 }
 
 func newRpcClient(opt ...Option) Client {
-	opts := newOptions(opt...)
+	opts := NewOptions(opt...)
 
 	p := pool.NewPool(
 		pool.Size(opts.PoolSize),

config/cmd/cmd.go

@@ -202,7 +202,6 @@ var (
 	}
 
 	DefaultClients = map[string]func(...client.Option) client.Client{
-		"rpc":  client.NewClient,
 		"mucp": cmucp.NewClient,
 		"grpc": cgrpc.NewClient,
 	}
@@ -224,7 +223,6 @@ var (
 	}
 
 	DefaultServers = map[string]func(...server.Option) server.Server{
-		"rpc":  server.NewServer,
 		"mucp": smucp.NewServer,
 		"grpc": sgrpc.NewServer,
 	}
@@ -242,8 +240,8 @@ var (
 	}
 
 	// used for default selection as the fall back
-	defaultClient    = "rpc"
-	defaultServer    = "rpc"
+	defaultClient    = "grpc"
+	defaultServer    = "grpc"
 	defaultBroker    = "http"
 	defaultRegistry  = "mdns"
 	defaultSelector  = "registry"

options.go

@@ -107,8 +107,6 @@ func Registry(r registry.Registry) Option {
 		// Update Client and Server
 		o.Client.Init(client.Registry(r))
 		o.Server.Init(server.Registry(r))
-		// Update Selector
-		o.Client.Options().Selector.Init(selector.Registry(r))
 		// Update Broker
 		o.Broker.Init(broker.Registry(r))
 	}

server/grpc/grpc.go

@@ -611,7 +611,7 @@ func (g *grpcServer) Register() error {
 	g.Unlock()
 
 	if !registered {
-		log.Logf("Registering node: %s", node.Id)
+		log.Logf("Registry [%s] Registering node: %s", config.Registry.String(), node.Id)
 	}
 
 	// create registry options

service/grpc/README.md

@@ -1,28 +0,0 @@
-# gRPC Service
-
-A simplified experience for building gRPC services. 
-
-## Overview
-
-The **gRPC service** makes use of [go-micro](https://github.com/micro/go-micro) plugins to create a simpler framework for gRPC development. 
-It interoperates with standard gRPC services seamlessly, including the [grpc-gateway](https://github.com/grpc-ecosystem/grpc-gateway). 
-The grpc service uses the go-micro broker, client and server plugins which make use of 
-[github.com/grpc/grpc-go](https://github.com/grpc/grpc-go) internally. 
-This means we ignore the go-micro codec and transport but provide a native grpc experience.
-
-<img src="https://micro.mu/docs/images/go-grpc.svg" />
-
-## Features
-
-- **Service Discovery** - We make use of go-micro's registry and selector interfaces to provide pluggable discovery 
-and client side load balancing. There's no need to dial connections, we'll do everything beneath the covers for you.
-
-- **PubSub Messaging** - Where gRPC only provides you synchronous communication, the **gRPC service** uses the go-micro broker 
-to provide asynchronous messaging while using the gRPC protocol.
-
-- **Micro Ecosystem** - Make use of the existing micro ecosystem of tooling including our api gateway, web dashboard, 
-command line interface and much more. We're enhancing gRPC with a simplified experience using micro.
-
-## I18n
-
-### [中文](README_cn.md)

service/grpc/README_cn.md

@@ -1,25 +0,0 @@
-# Micro gRPC [![License](https://img.shields.io/:license-apache-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![GoDoc](https://godoc.org/github.com/micro/go-micro/service/grpc?status.svg)](https://godoc.org/github.com/micro/go-micro/service/grpc) [![Travis CI](https://api.travis-ci.org/micro/go-micro/service/grpc.svg?branch=master)](https://travis-ci.org/micro/go-micro/service/grpc) [![Go Report Card](https://goreportcard.com/badge/micro/go-micro/service/grpc)](https://goreportcard.com/report/github.com/micro/go-micro/service/grpc)
-
-Micro gRPC是micro的gRPC框架插件，简化开发基于gRPC的服务。
-
-## 概览
-
-micro提供有基于Go的gRPC插件[go-micro](https://github.com/micro/go-micro)，该插件可以在内部集成gPRC，并与之无缝交互，让开发gRPC更简单，并支持[grpc-gateway](https://github.com/grpc-ecosystem/grpc-gateway)。
-
-micro有面向gRPC的[客户端](https://github.com/micro/go-plugins/tree/master/client)和[服务端](https://github.com/micro/go-plugins/tree/master/server)插件，go-grpc库调用客户端/服务端插件生成micro需要的gRPC代码，而客户端/服务端插件都是从[github.com/grpc/grpc-go](https://github.com/grpc/grpc-go)扩展而来，也即是说，我们不需要去知道go-micro是如何编解码或传输就可以使用原生的gRPC。
-
-## 特性
-
-- **服务发现** - go-micro的服务发现基于其[注册](https://github.com/micro/go-plugins/tree/master/registry)与[选择器](https://github.com/micro/go-micro/tree/master/selector)接口，实现了可插拔的服务发现与客户端侧的负载均衡，不需要拨号连接，micro已经把所有都封装好，大家只管用。
-
-- **消息发布订阅** - 因为gRPC只提供同步通信机制，而**Go gRPC**使用go-micro的[broker代理](https://github.com/micro/go-micro/tree/master/broker)提供异步消息，broker也是基于gRPC协议。
-
-- **Micro生态系统** - Micro生态系统包含工具链中，比如api网关、web管理控制台、CLI命令行接口等等。我们通过使用micro来增强gRPC框架的易用性。
-
-## 示例
-
-示例请查看[examples/greeter](https://github.com/micro/go-micro/service/grpc/tree/master/examples/greeter)。
-
-## 开始使用
-
-我们提供相关文档[docs](https://micro.mu/docs/go-grpc_cn.html)，以便上手。

service/grpc/grpc.go

@@ -1,58 +1,124 @@
 package grpc
 
 import (
-	"time"
-
-	"github.com/micro/go-micro"
-	broker "github.com/micro/go-micro/broker"
-	client "github.com/micro/go-micro/client/grpc"
-	server "github.com/micro/go-micro/server/grpc"
+	"github.com/micro/go-micro/client"
+	gclient "github.com/micro/go-micro/client/grpc"
+	"github.com/micro/go-micro/server"
+	gserver "github.com/micro/go-micro/server/grpc"
+	"github.com/micro/go-micro/service"
 )
 
+type grpcService struct {
+	opts service.Options
+}
+
+func newService(opts ...service.Option) service.Service {
+	options := service.NewOptions(opts...)
+
+	return &grpcService{
+		opts: options,
+	}
+}
+
+func (s *grpcService) Name() string {
+	return s.opts.Server.Options().Name
+}
+
+// Init initialises options. Additionally it calls cmd.Init
+// which parses command line flags. cmd.Init is only called
+// on first Init.
+func (s *grpcService) Init(opts ...service.Option) {
+	// process options
+	for _, o := range opts {
+		o(&s.opts)
+	}
+}
+
+func (s *grpcService) Options() service.Options {
+	return s.opts
+}
+
+func (s *grpcService) Client() client.Client {
+	return s.opts.Client
+}
+
+func (s *grpcService) Server() server.Server {
+	return s.opts.Server
+}
+
+func (s *grpcService) String() string {
+	return "grpc"
+}
+
+func (s *grpcService) Start() error {
+	for _, fn := range s.opts.BeforeStart {
+		if err := fn(); err != nil {
+			return err
+		}
+	}
+
+	if err := s.opts.Server.Start(); err != nil {
+		return err
+	}
+
+	for _, fn := range s.opts.AfterStart {
+		if err := fn(); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *grpcService) Stop() error {
+	var gerr error
+
+	for _, fn := range s.opts.BeforeStop {
+		if err := fn(); err != nil {
+			gerr = err
+		}
+	}
+
+	if err := s.opts.Server.Stop(); err != nil {
+		return err
+	}
+
+	for _, fn := range s.opts.AfterStop {
+		if err := fn(); err != nil {
+			gerr = err
+		}
+	}
+
+	return gerr
+}
+
+func (s *grpcService) Run() error {
+	if err := s.Start(); err != nil {
+		return err
+	}
+
+	// wait on context cancel
+	<-s.opts.Context.Done()
+
+	return s.Stop()
+}
+
 // NewService returns a grpc service compatible with go-micro.Service
-func NewService(opts ...micro.Option) micro.Service {
+func NewService(opts ...service.Option) service.Service {
 	// our grpc client
-	c := client.NewClient()
+	c := gclient.NewClient()
 	// our grpc server
-	s := server.NewServer()
-	// our grpc broker
-	b := broker.NewBroker()
+	s := gserver.NewServer()
 
 	// create options with priority for our opts
-	options := []micro.Option{
-		micro.Client(c),
-		micro.Server(s),
-		micro.Broker(b),
+	options := []service.Option{
+		service.Client(c),
+		service.Server(s),
 	}
 
 	// append passed in opts
 	options = append(options, opts...)
 
 	// generate and return a service
-	return micro.NewService(options...)
-}
-
-// NewFunction returns a grpc service compatible with go-micro.Function
-func NewFunction(opts ...micro.Option) micro.Function {
-	// our grpc client
-	c := client.NewClient()
-	// our grpc server
-	s := server.NewServer()
-	// our grpc broker
-	b := broker.NewBroker()
-
-	// create options with priority for our opts
-	options := []micro.Option{
-		micro.Client(c),
-		micro.Server(s),
-		micro.Broker(b),
-		micro.RegisterTTL(time.Minute),
-		micro.RegisterInterval(time.Second * 30),
-	}
-
-	// append passed in opts
-	options = append(options, opts...)
-
-	// generate and return a function
-	return micro.NewFunction(options...)
+	return newService(options...)
 }

service/grpc/grpc_test.go

@@ -7,8 +7,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/micro/go-micro"
 	"github.com/micro/go-micro/registry/memory"
+	"github.com/micro/go-micro/service"
 	hello "github.com/micro/go-micro/service/grpc/proto"
 	mls "github.com/micro/go-micro/util/tls"
 )
@@ -32,13 +32,13 @@ func TestGRPCService(t *testing.T) {
 
 	// create GRPC service
 	service := NewService(
-		micro.Name("test.service"),
-		micro.Registry(r),
-		micro.AfterStart(func() error {
+		service.Name("test.service"),
+		service.Registry(r),
+		service.AfterStart(func() error {
 			wg.Done()
 			return nil
 		}),
-		micro.Context(ctx),
+		service.Context(ctx),
 	)
 
 	// register test handler
@@ -81,50 +81,6 @@ func TestGRPCService(t *testing.T) {
 	}
 }
 
-func TestGRPCFunction(t *testing.T) {
-	var wg sync.WaitGroup
-	wg.Add(1)
-
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
-	// create service
-	fn := NewFunction(
-		micro.Name("test.function"),
-		micro.Registry(memory.NewRegistry()),
-		micro.AfterStart(func() error {
-			wg.Done()
-			return nil
-		}),
-		micro.Context(ctx),
-	)
-
-	// register test handler
-	hello.RegisterTestHandler(fn.Server(), &testHandler{})
-
-	// run service
-	go fn.Run()
-
-	// wait for start
-	wg.Wait()
-
-	// create client
-	test := hello.NewTestService("test.function", fn.Client())
-
-	// call service
-	rsp, err := test.Call(context.Background(), &hello.Request{
-		Name: "John",
-	})
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// check message
-	if rsp.Msg != "Hello John" {
-		t.Fatalf("unexpected response %s", rsp.Msg)
-	}
-}
-
 func TestGRPCTLSService(t *testing.T) {
 	var wg sync.WaitGroup
 	wg.Add(1)
@@ -147,13 +103,13 @@ func TestGRPCTLSService(t *testing.T) {
 
 	// create GRPC service
 	service := NewService(
-		micro.Name("test.service"),
-		micro.Registry(r),
-		micro.AfterStart(func() error {
+		service.Name("test.service"),
+		service.Registry(r),
+		service.AfterStart(func() error {
 			wg.Done()
 			return nil
 		}),
-		micro.Context(ctx),
+		service.Context(ctx),
 		// set TLS config
 		WithTLS(config),
 	)

service/grpc/options.go

@@ -3,14 +3,14 @@ package grpc
 import (
 	"crypto/tls"
 
-	"github.com/micro/go-micro"
 	gc "github.com/micro/go-micro/client/grpc"
 	gs "github.com/micro/go-micro/server/grpc"
+	"github.com/micro/go-micro/service"
 )
 
 // WithTLS sets the TLS config for the service
-func WithTLS(t *tls.Config) micro.Option {
-	return func(o *micro.Options) {
+func WithTLS(t *tls.Config) service.Option {
+	return func(o *service.Options) {
 		o.Client.Init(
 			gc.AuthTLS(t),
 		)

service/mucp/mucp.go

@@ -2,20 +2,116 @@
 package mucp
 
 import (
-	// TODO: change to go-micro/service
-	"github.com/micro/go-micro"
+	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/server"
 	cmucp "github.com/micro/go-micro/client/mucp"
 	smucp "github.com/micro/go-micro/server/mucp"
+	"github.com/micro/go-micro/service"
 )
 
+type mucpService struct {
+	opts service.Options
+}
+
+func newService(opts ...service.Option) service.Service {
+	options := service.NewOptions(opts...)
+
+	return &mucpService{
+		opts: options,
+	}
+}
+
+func (s *mucpService) Name() string {
+	return s.opts.Server.Options().Name
+}
+
+// Init initialises options. Additionally it calls cmd.Init
+// which parses command line flags. cmd.Init is only called
+// on first Init.
+func (s *mucpService) Init(opts ...service.Option) {
+	// process options
+	for _, o := range opts {
+		o(&s.opts)
+	}
+}
+
+func (s *mucpService) Options() service.Options {
+	return s.opts
+}
+
+func (s *mucpService) Client() client.Client {
+	return s.opts.Client
+}
+
+func (s *mucpService) Server() server.Server {
+	return s.opts.Server
+}
+
+func (s *mucpService) String() string {
+	return "mucp"
+}
+
+func (s *mucpService) Start() error {
+	for _, fn := range s.opts.BeforeStart {
+		if err := fn(); err != nil {
+			return err
+		}
+	}
+
+	if err := s.opts.Server.Start(); err != nil {
+		return err
+	}
+
+	for _, fn := range s.opts.AfterStart {
+		if err := fn(); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *mucpService) Stop() error {
+	var gerr error
+
+	for _, fn := range s.opts.BeforeStop {
+		if err := fn(); err != nil {
+			gerr = err
+		}
+	}
+
+	if err := s.opts.Server.Stop(); err != nil {
+		return err
+	}
+
+	for _, fn := range s.opts.AfterStop {
+		if err := fn(); err != nil {
+			gerr = err
+		}
+	}
+
+	return gerr
+}
+
+func (s *mucpService) Run() error {
+	if err := s.Start(); err != nil {
+		return err
+	}
+
+	// wait on context cancel
+	<-s.opts.Context.Done()
+
+	return s.Stop()
+}
+
 // NewService returns a new mucp service
-func NewService(opts ...micro.Option) micro.Service {
-	options := []micro.Option{
-		micro.Client(cmucp.NewClient()),
-		micro.Server(smucp.NewServer()),
+func NewService(opts ...service.Option) service.Service {
+	options := []service.Option{
+		service.Client(cmucp.NewClient()),
+		service.Server(smucp.NewServer()),
 	}
 
 	options = append(options, opts...)
 
-	return micro.NewService(options...)
+	return newService(options...)
 }

service/options.go

@@ -31,7 +31,7 @@ type Options struct {
 
 type Option func(*Options)
 
-func newOptions(opts ...Option) Options {
+func NewOptions(opts ...Option) Options {
 	opt := Options{
 		Broker:    broker.DefaultBroker,
 		Client:    client.DefaultClient,