func (d *deepCopyGen) genOneOfWriter(m *generator.Descriptor, f *descriptor.FieldDescriptorProto, oneOfFuncs map[string][]func()) {
	ccTypeName := generator.CamelCaseSlice(m.TypeName())
	fName := generator.CamelCase(*f.Name)
	if gogoproto.IsCustomName(f) {
		fName = gogoproto.GetCustomName(f)
	}

	odp := m.OneofDecl[int(*f.OneofIndex)]
	oneOfName := generator.CamelCase(odp.GetName())
	oneOfNameFuncs, ok := oneOfFuncs[oneOfName]
	if !ok {
		oneOfFunc := func() {
			d.gen.P("\tswitch m.", oneOfName, ".(type) {")
		}
		oneOfNameFuncs = append(oneOfNameFuncs, oneOfFunc)
	}

	isMessage := f.IsMessage()
	oneOfFunc := func() {
		tName := ccTypeName + "_" + fName
		d.gen.P("\tcase *", tName, ":")
		d.gen.P("\t\ti := &", tName, " {")
		if isMessage {
			d.gen.P("\t\t\t", fName, ": m.Get", fName, "().Copy(),")
		} else {
			d.gen.P("\t\t\t", fName, ": m.Get", fName, "(),")
		}
		d.gen.P("\t\t}")
		d.gen.P()
		d.gen.P("\t\to.", oneOfName, " = i")
	}

	oneOfNameFuncs = append(oneOfNameFuncs, oneOfFunc)
	oneOfFuncs[oneOfName] = oneOfNameFuncs
}

func (p *test) Generate(imports generator.PluginImports, file *generator.FileDescriptor) bool {
	used := false
	testingPkg := imports.NewImport("testing")
	randPkg := imports.NewImport("math/rand")
	timePkg := imports.NewImport("time")

	for _, message := range file.Messages() {
		if !gogoproto.HasTestGen(file.FileDescriptorProto, message.DescriptorProto) {
			continue
		}

		if message.DescriptorProto.GetOptions().GetMapEntry() {
			continue
		}

		used = true
		ccTypeName := generator.CamelCaseSlice(message.TypeName())
		p.P(`func Test`, ccTypeName, `Copy(t *`, testingPkg.Use(), `.T) {`)
		p.In()
		p.P(`popr := `, randPkg.Use(), `.New(`, randPkg.Use(), `.NewSource(`, timePkg.Use(), `.Now().UnixNano()))`)
		p.P(`in := NewPopulated`, ccTypeName, `(popr, true)`)
		p.P(`out := in.Copy()`)
		p.P(`if !in.Equal(out) {`)
		p.In()
		p.P(`t.Fatalf("%#v != %#v", in, out)`)
		p.Out()
		p.P(`}`)

		for _, f := range message.Field {
			fName := generator.CamelCase(*f.Name)
			if gogoproto.IsCustomName(f) {
				fName = gogoproto.GetCustomName(f)
			}

			if f.OneofIndex != nil {
				odp := message.OneofDecl[int(*f.OneofIndex)]
				fName = generator.CamelCase(odp.GetName())
			}

			p.P(`if &in.`, fName, ` == &out.`, fName, ` {`)
			p.In()
			p.P(`t.Fatalf("`, fName, `: %#v == %#v", &in.`, fName, `, &out.`, fName, `)`)
			p.Out()
			p.P(`}`)
		}

		p.Out()
		p.P(`}`)
	}

	return used
}

func (p *plugin) Generate(file *generator.FileDescriptor) {
	for _, msg := range file.Messages() {
		face := gogoproto.IsFace(file.FileDescriptorProto, msg.DescriptorProto)
		for _, field := range msg.GetField() {
			if field.OneofIndex == nil {
				continue
			}
			if face {
				fmt.Fprintf(os.Stderr, "ERROR: field %v.%v cannot be in a face and oneof\n", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name))
				os.Exit(1)
			}
			if gogoproto.IsEmbed(field) {
				fmt.Fprintf(os.Stderr, "ERROR: field %v.%v cannot be in an oneof and an embedded field\n", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name))
				os.Exit(1)
			}
			if !gogoproto.IsNullable(field) {
				fmt.Fprintf(os.Stderr, "ERROR: field %v.%v cannot be in an oneof and a non-nullable field\n", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name))
				os.Exit(1)
			}
			if gogoproto.IsUnion(file.FileDescriptorProto, msg.DescriptorProto) {
				fmt.Fprintf(os.Stderr, "ERROR: field %v.%v cannot be in an oneof and in an union (deprecated)\n", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name))
				os.Exit(1)
			}
		}
	}
}

func (p *plugin) checkNameSpace(message *generator.Descriptor) map[string]bool {
	ccTypeName := generator.CamelCaseSlice(message.TypeName())
	names := make(map[string]bool)
	for _, field := range message.Field {
		fieldname := generator.CamelCase(*field.Name)
		if field.IsMessage() && gogoproto.IsEmbed(field) {
			desc := p.ObjectNamed(field.GetTypeName())
			moreNames := p.checkNameSpace(desc.(*generator.Descriptor))
			for another := range moreNames {
				if names[another] {
					fmt.Fprintf(os.Stderr, "ERROR: duplicate embedded fieldname %v in type %v\n", fieldname, ccTypeName)
					os.Exit(1)
				}
				names[another] = true
			}
		} else {
			if names[fieldname] {
				fmt.Fprintf(os.Stderr, "ERROR: duplicate embedded fieldname %v in type %v\n", fieldname, ccTypeName)
				os.Exit(1)
			}
			names[fieldname] = true
		}
	}
	return names
}

func (p *plugin) Generate(file *generator.FileDescriptor) {
	for _, msg := range file.Messages() {
		for _, os := range overwriters {
			possible := true
			for _, overwriter := range os {
				if overwriter(file.FileDescriptorProto, msg.DescriptorProto) {
					possible = false
				}
			}
			if possible {
				p.checkOverwrite(msg, os)
			}
		}
		p.checkNameSpace(msg)
		for _, field := range msg.GetField() {
			if gogoproto.IsEmbed(field) && gogoproto.IsCustomName(field) {
				fmt.Fprintf(os.Stderr, "ERROR: field %v with custom name %v cannot be embedded", *field.Name, gogoproto.GetCustomName(field))
				os.Exit(1)
			}
		}
		p.checkRepeated(msg)
	}
	for _, e := range file.GetExtension() {
		if gogoproto.IsEmbed(e) {
			fmt.Fprintf(os.Stderr, "ERROR: extended field %v cannot be embedded", generator.CamelCase(*e.Name))
			os.Exit(1)
		}
	}
}

func (d *deepCopyGen) genMapWriter(m *generator.Descriptor, f *descriptor.FieldDescriptorProto, notNullablePrefix string) func() {
	fName := generator.CamelCase(*f.Name)
	if gogoproto.IsCustomName(f) {
		fName = gogoproto.GetCustomName(f)
	}

	dv := d.gen.ObjectNamed(f.GetTypeName())
	if desc, ok := dv.(*generator.Descriptor); ok && desc.GetOptions().GetMapEntry() {
		mt := d.gen.GoMapType(desc, f)
		typename := mt.GoType
		valueIsMessage := mt.ValueField.IsMessage()
		mapfunc := func() {
			d.gen.P("\tif m.", fName, " != nil {")
			d.gen.P("\t\to.", fName, " = make(", typename, ")")
			d.gen.P("\t\tfor k, v := range m.", fName, " {")
			if valueIsMessage {
				d.gen.P("\t\t\to.", fName, "[k] = ", notNullablePrefix, "v.Copy()")
			} else {
				d.gen.P("\t\t\to.", fName, "[k] = v")
			}
			d.gen.P("\t\t}")
			d.gen.P("\t}")
			d.gen.P()
		}

		return mapfunc
	}

	return nil
}

func (d *deepCopyGen) genRepeated(m *generator.Descriptor, f *descriptor.FieldDescriptorProto) {
	fName := generator.CamelCase(*f.Name)
	if gogoproto.IsCustomName(f) {
		fName = gogoproto.GetCustomName(f)
	}

	typename, _ := d.GoType(m, f)

	d.P("if o.", fName, " != nil {")
	d.In()
	if f.IsMessage() {
		d.P("m.", fName, " = make(", typename, ", len(o.", fName, "))")

		// TODO(stevvooe): Handle custom type here?
		goType := d.TypeName(d.ObjectNamed(f.GetTypeName())) // elides [] or *

		d.P("for i := range m.", fName, " {")
		d.In()
		if !gogoproto.IsNullable(f) {
			d.genCopyFunc("&m."+fName+"[i]", "&o."+fName+"[i]")
		} else {
			d.P("m.", fName, "[i] = &", goType, "{}")
			d.genCopyFunc("m."+fName+"[i]", "o."+fName+"[i]")
		}
		d.Out()
		d.P("}")
	} else {
		d.P("m.", fName, " = make(", typename, ", len(o.", fName, "))")
		d.P("copy(m.", fName, ", ", "o.", fName, ")")
	}
	d.Out()
	d.P("}")
	d.P()
}

// generateClientSignature returns the client-side signature for a method.
func (g *grpc) generateClientSignature(servName string, method *pb.MethodDescriptorProto) string {
	origMethName := method.GetName()
	methName := generator.CamelCase(origMethName)
	if reservedClientName[methName] {
		methName += "_"
	}
	reqArg := ", in *" + g.typeName(method.GetInputType())
	if method.GetClientStreaming() {
		reqArg = ""
	}
	respName := "*" + g.typeName(method.GetOutputType())
	if method.GetServerStreaming() || method.GetClientStreaming() {
		respName = servName + "_" + generator.CamelCase(origMethName) + "Client"
	}
	return fmt.Sprintf("%s(ctx %s.Context%s, opts ...%s.CallOption) (%s, error)", methName, contextPkg, reqArg, grpcPkg, respName)
}

func (d *deepCopyGen) genRepeatedWriter(m *generator.Descriptor, f *descriptor.FieldDescriptorProto, notNullablePrefix string) func() {
	fName := generator.CamelCase(*f.Name)
	if gogoproto.IsCustomName(f) {
		fName = gogoproto.GetCustomName(f)
	}

	typename, _ := d.gen.GoType(m, f)
	isMessage := f.IsMessage()

	repeatedFunc := func() {
		d.gen.P("\tif m.", fName, " != nil {")
		d.gen.P("\t\to.", fName, " = make(", typename, ", 0, len(m.", fName, "))")
		if isMessage {
			d.gen.P("\t\tfor _, v := range m.", fName, " {")
			d.gen.P("\t\t\to.", fName, " = append(o.", fName, ", ", notNullablePrefix, "v.Copy())")
			d.gen.P("\t\t}")
		} else {
			d.gen.P("\t\to.", fName, " = append(o.", fName, ", m.", fName, "...)")
		}
		d.gen.P("\t}")
		d.gen.P()
	}

	return repeatedFunc
}

func (d *deepCopyGen) genOneOf(m *generator.Descriptor, oneof *descriptor.OneofDescriptorProto, fields []*descriptor.FieldDescriptorProto) {
	oneOfName := generator.CamelCase(oneof.GetName())

	d.P("if o.", oneOfName, " != nil {")
	d.In()
	d.P("switch o.", oneOfName, ".(type) {")

	for _, f := range fields {
		ccTypeName := generator.CamelCaseSlice(m.TypeName())
		fName := generator.CamelCase(*f.Name)
		if gogoproto.IsCustomName(f) {
			fName = gogoproto.GetCustomName(f)
		}

		tName := ccTypeName + "_" + fName
		d.P("case *", tName, ":")
		d.In()
		d.P("v := ", tName, " {")
		d.In()

		var rhs string
		if f.IsMessage() {
			goType := d.TypeName(d.ObjectNamed(f.GetTypeName())) // elides [] or *
			rhs = "&" + goType + "{}"
		} else {
			rhs = "o.Get" + fName + "()"
		}
		d.P(fName, ": ", rhs, ",")
		d.Out()
		d.P("}")

		if f.IsMessage() {
			d.genCopyFunc("v."+fName, "o.Get"+fName+"()")
		}

		d.P("m.", oneOfName, " = &v")
		d.Out()
	}

	d.Out()
	d.P("}")
	d.Out()
	d.P("}")
	d.P()
}

func (p *plugin) checkRepeated(message *generator.Descriptor) {
	ccTypeName := generator.CamelCaseSlice(message.TypeName())
	for _, field := range message.Field {
		if !gogoproto.IsEmbed(field) {
			continue
		}
		if field.IsBytes() {
			fieldname := generator.CamelCase(*field.Name)
			fmt.Fprintf(os.Stderr, "ERROR: found embedded bytes field %s in message %s\n", fieldname, ccTypeName)
			os.Exit(1)
		}
		if !field.IsRepeated() {
			continue
		}
		fieldname := generator.CamelCase(*field.Name)
		fmt.Fprintf(os.Stderr, "ERROR: found repeated embedded field %s in message %s\n", fieldname, ccTypeName)
		os.Exit(1)
	}
}

// generateServerSignature returns the server-side signature for a method.
func (g *grpc) generateServerSignature(servName string, method *pb.MethodDescriptorProto) string {
	origMethName := method.GetName()
	methName := generator.CamelCase(origMethName)
	if reservedClientName[methName] {
		methName += "_"
	}

	var reqArgs []string
	ret := "error"
	if !method.GetServerStreaming() && !method.GetClientStreaming() {
		reqArgs = append(reqArgs, contextPkg+".Context")
		ret = "(*" + g.typeName(method.GetOutputType()) + ", error)"
	}
	if !method.GetClientStreaming() {
		reqArgs = append(reqArgs, "*"+g.typeName(method.GetInputType()))
	}
	if method.GetServerStreaming() || method.GetClientStreaming() {
		reqArgs = append(reqArgs, servName+"_"+generator.CamelCase(origMethName)+"Server")
	}

	return methName + "(" + strings.Join(reqArgs, ", ") + ") " + ret
}

func (p *plugin) Generate(file *generator.FileDescriptor) {
	proto3 := gogoproto.IsProto3(file.FileDescriptorProto)
	for _, msg := range file.Messages() {
		getters := gogoproto.HasGoGetters(file.FileDescriptorProto, msg.DescriptorProto)
		face := gogoproto.IsFace(file.FileDescriptorProto, msg.DescriptorProto)
		for _, field := range msg.GetField() {
			if len(field.GetDefaultValue()) > 0 {
				if !getters {
					fmt.Fprintf(os.Stderr, "ERROR: field %v.%v cannot have a default value and not have a getter method", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name))
					os.Exit(1)
				}
				if face {
					fmt.Fprintf(os.Stderr, "ERROR: field %v.%v cannot have a default value be in a face", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name))
					os.Exit(1)
				}
			}
			if gogoproto.IsNullable(field) {
				continue
			}
			if len(field.GetDefaultValue()) > 0 {
				fmt.Fprintf(os.Stderr, "ERROR: field %v.%v cannot be non-nullable and have a default value", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name))
				os.Exit(1)
			}
			if !field.IsMessage() && !gogoproto.IsCustomType(field) {
				if field.IsRepeated() {
					fmt.Fprintf(os.Stderr, "WARNING: field %v.%v is a repeated non-nullable native type, nullable=false has no effect\n", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name))
				} else if proto3 {
					fmt.Fprintf(os.Stderr, "ERROR: field %v.%v is a native type and in proto3 syntax with nullable=false there exists conflicting implementations when encoding zero values", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name))
					os.Exit(1)
				}
				if field.IsBytes() {
					fmt.Fprintf(os.Stderr, "WARNING: field %v.%v is a non-nullable bytes type, nullable=false has no effect\n", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name))
				}
			}
			if !field.IsEnum() {
				continue
			}
			enum := p.ObjectNamed(field.GetTypeName()).(*generator.EnumDescriptor)
			if len(enum.Value) == 0 || enum.Value[0].GetNumber() != 0 {
				fmt.Fprintf(os.Stderr, "ERROR: field %v.%v cannot be non-nullable and be an enum type %v which does not start with zero", generator.CamelCase(*msg.Name), generator.CamelCase(*field.Name), enum.GetName())
				os.Exit(1)
			}
		}
	}
	for _, e := range file.GetExtension() {
		if !gogoproto.IsNullable(e) {
			fmt.Fprintf(os.Stderr, "ERROR: extended field %v cannot be nullable %v", generator.CamelCase(e.GetName()), generator.CamelCase(*e.Name))
			os.Exit(1)
		}
	}
}

// CustomNameID preprocess the field, and set the [(gogoproto.customname) = "..."]
// if necessary, in order to avoid setting `gogoproto.customname` manually.
// The automatically assigned name should conform to Golang convention.
func CustomNameID(file *descriptor.FileDescriptorProto) {

	f := func(field *descriptor.FieldDescriptorProto) {
		// Skip if [(gogoproto.customname) = "..."] has already been set.
		if gogoproto.IsCustomName(field) {
			return
		}
		// Skip if embedded
		if gogoproto.IsEmbed(field) {
			return
		}
		if field.OneofIndex != nil {
			return
		}
		fieldName := generator.CamelCase(*field.Name)
		switch {
		case *field.Name == "id":
			// id -> ID
			fieldName = "ID"
		case strings.HasPrefix(*field.Name, "id_"):
			// id_some -> IDSome
			fieldName = "ID" + fieldName[2:]
		case strings.HasSuffix(*field.Name, "_id"):
			// some_id -> SomeID
			fieldName = fieldName[:len(fieldName)-2] + "ID"
		case strings.HasSuffix(*field.Name, "_ids"):
			// some_ids -> SomeIDs
			fieldName = fieldName[:len(fieldName)-3] + "IDs"
		default:
			return
		}
		if field.Options == nil {
			field.Options = &descriptor.FieldOptions{}
		}
		if err := proto.SetExtension(field.Options, gogoproto.E_Customname, &fieldName); err != nil {
			panic(err)
		}
	}

	// Iterate through all fields in file
	vanity.ForEachFieldExcludingExtensions(file.MessageType, f)
}

func (p *plugin) checkOverwrite(message *generator.Descriptor, enablers map[string]gogoproto.EnableFunc) {
	ccTypeName := generator.CamelCaseSlice(message.TypeName())
	names := []string{}
	for name := range enablers {
		names = append(names, name)
	}
	for _, field := range message.Field {
		if field.IsMessage() && gogoproto.IsEmbed(field) {
			fieldname := generator.CamelCase(*field.Name)
			desc := p.ObjectNamed(field.GetTypeName())
			msg := desc.(*generator.Descriptor)
			for errStr, enabled := range enablers {
				if enabled(msg.File(), msg.DescriptorProto) {
					fmt.Fprintf(os.Stderr, "WARNING: found non-%v %v with embedded %v %v\n", names, ccTypeName, errStr, fieldname)
				}
			}
			p.checkOverwrite(msg, enablers)
		}
	}
}

func (d *deepCopyGen) genMap(m *generator.Descriptor, f *descriptor.FieldDescriptorProto) bool {
	fName := generator.CamelCase(*f.Name)
	if gogoproto.IsCustomName(f) {
		fName = gogoproto.GetCustomName(f)
	}

	dv := d.ObjectNamed(f.GetTypeName())
	desc, ok := dv.(*generator.Descriptor)
	if !ok || !desc.GetOptions().GetMapEntry() {
		return false
	}

	mt := d.GoMapType(desc, f)
	typename := mt.GoType

	d.P("if o.", fName, " != nil {")
	d.In()
	d.P("m.", fName, " = make(", typename, ", ", "len(o.", fName, "))")
	d.P("for k, v := range o.", fName, " {")
	d.In()
	if mt.ValueField.IsMessage() {
		if !gogoproto.IsNullable(f) {
			d.P("n := ", d.TypeName(d.ObjectNamed(mt.ValueField.GetTypeName())), "{}")
			d.genCopyFunc("&n", "&v")
			d.P("m.", fName, "[k] = ", "n")
		} else {
			d.P("m.", fName, "[k] = &", d.TypeName(d.ObjectNamed(mt.ValueField.GetTypeName())), "{}")
			d.genCopyFunc("m."+fName+"[k]", "v")
		}
	} else {
		d.P("m.", fName, "[k] = v")
	}
	d.Out()
	d.P("}")
	d.Out()
	d.P("}")
	d.P()

	return true
}

//.........这里部分代码省略.........
			p.encodeKey(fieldNumber, wireType)
			p.P(`l = len(s)`)
			p.encodeVarint("l")
			p.P(`i+=copy(dAtA[i:], s)`)
			p.Out()
			p.P(`}`)
		} else if proto3 {
			p.P(`if len(m.`, fieldname, `) > 0 {`)
			p.In()
			p.encodeKey(fieldNumber, wireType)
			p.callVarint(`len(m.`, fieldname, `)`)
			p.P(`i+=copy(dAtA[i:], m.`, fieldname, `)`)
			p.Out()
			p.P(`}`)
		} else if !nullable {
			p.encodeKey(fieldNumber, wireType)
			p.callVarint(`len(m.`, fieldname, `)`)
			p.P(`i+=copy(dAtA[i:], m.`, fieldname, `)`)
		} else {
			p.encodeKey(fieldNumber, wireType)
			p.callVarint(`len(*m.`, fieldname, `)`)
			p.P(`i+=copy(dAtA[i:], *m.`, fieldname, `)`)
		}
	case descriptor.FieldDescriptorProto_TYPE_GROUP:
		panic(fmt.Errorf("marshaler does not support group %v", fieldname))
	case descriptor.FieldDescriptorProto_TYPE_MESSAGE:
		if p.IsMap(field) {
			m := p.GoMapType(nil, field)
			keygoTyp, keywire := p.GoType(nil, m.KeyField)
			keygoAliasTyp, _ := p.GoType(nil, m.KeyAliasField)
			// keys may not be pointers
			keygoTyp = strings.Replace(keygoTyp, "*", "", 1)
			keygoAliasTyp = strings.Replace(keygoAliasTyp, "*", "", 1)
			keyCapTyp := generator.CamelCase(keygoTyp)
			valuegoTyp, valuewire := p.GoType(nil, m.ValueField)
			valuegoAliasTyp, _ := p.GoType(nil, m.ValueAliasField)
			nullable, valuegoTyp, valuegoAliasTyp = generator.GoMapValueTypes(field, m.ValueField, valuegoTyp, valuegoAliasTyp)
			keyKeySize := keySize(1, wireToType(keywire))
			valueKeySize := keySize(2, wireToType(valuewire))
			if gogoproto.IsStableMarshaler(file.FileDescriptorProto, message.DescriptorProto) {
				keysName := `keysFor` + fieldname
				p.P(keysName, ` := make([]`, keygoTyp, `, 0, len(m.`, fieldname, `))`)
				p.P(`for k, _ := range m.`, fieldname, ` {`)
				p.In()
				p.P(keysName, ` = append(`, keysName, `, `, keygoTyp, `(k))`)
				p.Out()
				p.P(`}`)
				p.P(p.sortKeysPkg.Use(), `.`, keyCapTyp, `s(`, keysName, `)`)
				p.P(`for _, k := range `, keysName, ` {`)
			} else {
				p.P(`for k, _ := range m.`, fieldname, ` {`)
			}
			p.In()
			p.encodeKey(fieldNumber, wireType)
			sum := []string{strconv.Itoa(keyKeySize)}
			switch m.KeyField.GetType() {
			case descriptor.FieldDescriptorProto_TYPE_DOUBLE,
				descriptor.FieldDescriptorProto_TYPE_FIXED64,
				descriptor.FieldDescriptorProto_TYPE_SFIXED64:
				sum = append(sum, `8`)
			case descriptor.FieldDescriptorProto_TYPE_FLOAT,
				descriptor.FieldDescriptorProto_TYPE_FIXED32,
				descriptor.FieldDescriptorProto_TYPE_SFIXED32:
				sum = append(sum, `4`)
			case descriptor.FieldDescriptorProto_TYPE_INT64,
				descriptor.FieldDescriptorProto_TYPE_UINT64,

// generateService generates all the code for the named service.
func (g *grpc) generateService(file *generator.FileDescriptor, service *pb.ServiceDescriptorProto, index int) {
	path := fmt.Sprintf("6,%d", index) // 6 means service.

	origServName := service.GetName()
	fullServName := origServName
	if pkg := file.GetPackage(); pkg != "" {
		fullServName = pkg + "." + fullServName
	}
	servName := generator.CamelCase(origServName)

	g.P()
	g.P("// Client API for ", servName, " service")
	g.P()

	// Client interface.
	g.P("type ", servName, "Client interface {")
	for i, method := range service.Method {
		g.gen.PrintComments(fmt.Sprintf("%s,2,%d", path, i)) // 2 means method in a service.
		g.P(g.generateClientSignature(servName, method))
	}
	g.P("}")
	g.P()

	// Client structure.
	g.P("type ", unexport(servName), "Client struct {")
	g.P("cc *", grpcPkg, ".ClientConn")
	g.P("}")
	g.P()

	// NewClient factory.
	g.P("func New", servName, "Client (cc *", grpcPkg, ".ClientConn) ", servName, "Client {")
	g.P("return &", unexport(servName), "Client{cc}")
	g.P("}")
	g.P()

	var methodIndex, streamIndex int
	serviceDescVar := "_" + servName + "_serviceDesc"
	// Client method implementations.
	for _, method := range service.Method {
		var descExpr string
		if !method.GetServerStreaming() && !method.GetClientStreaming() {
			// Unary RPC method
			descExpr = fmt.Sprintf("&%s.Methods[%d]", serviceDescVar, methodIndex)
			methodIndex++
		} else {
			// Streaming RPC method
			descExpr = fmt.Sprintf("&%s.Streams[%d]", serviceDescVar, streamIndex)
			streamIndex++
		}
		g.generateClientMethod(servName, fullServName, serviceDescVar, method, descExpr)
	}

	g.P("// Server API for ", servName, " service")
	g.P()

	// Server interface.
	serverType := servName + "Server"
	g.P("type ", serverType, " interface {")
	for i, method := range service.Method {
		g.gen.PrintComments(fmt.Sprintf("%s,2,%d", path, i)) // 2 means method in a service.
		g.P(g.generateServerSignature(servName, method))
	}
	g.P("}")
	g.P()

	// Server registration.
	g.P("func Register", servName, "Server(s *", grpcPkg, ".Server, srv ", serverType, ") {")
	g.P("s.RegisterService(&", serviceDescVar, `, srv)`)
	g.P("}")
	g.P()

	// Server handler implementations.
	var handlerNames []string
	for _, method := range service.Method {
		hname := g.generateServerMethod(servName, fullServName, method)
		handlerNames = append(handlerNames, hname)
	}

	// Service descriptor.
	g.P("var ", serviceDescVar, " = ", grpcPkg, ".ServiceDesc {")
	g.P("ServiceName: ", strconv.Quote(fullServName), ",")
	g.P("HandlerType: (*", serverType, ")(nil),")
	g.P("Methods: []", grpcPkg, ".MethodDesc{")
	for i, method := range service.Method {
		if method.GetServerStreaming() || method.GetClientStreaming() {
			continue
		}
		g.P("{")
		g.P("MethodName: ", strconv.Quote(method.GetName()), ",")
		g.P("Handler: ", handlerNames[i], ",")
		g.P("},")
	}
	g.P("},")
	g.P("Streams: []", grpcPkg, ".StreamDesc{")
	for i, method := range service.Method {
		if !method.GetServerStreaming() && !method.GetClientStreaming() {
			continue
		}
		g.P("{")
//.........这里部分代码省略.........

func (g *grpc) generateClientMethod(servName, fullServName, serviceDescVar string, method *pb.MethodDescriptorProto, descExpr string) {
	sname := fmt.Sprintf("/%s/%s", fullServName, method.GetName())
	methName := generator.CamelCase(method.GetName())
	inType := g.typeName(method.GetInputType())
	outType := g.typeName(method.GetOutputType())

	g.P("func (c *", unexport(servName), "Client) ", g.generateClientSignature(servName, method), "{")
	if !method.GetServerStreaming() && !method.GetClientStreaming() {
		g.P("out := new(", outType, ")")
		// TODO: Pass descExpr to Invoke.
		g.P("err := ", grpcPkg, `.Invoke(ctx, "`, sname, `", in, out, c.cc, opts...)`)
		g.P("if err != nil { return nil, err }")
		g.P("return out, nil")
		g.P("}")
		g.P()
		return
	}
	streamType := unexport(servName) + methName + "Client"
	g.P("stream, err := ", grpcPkg, ".NewClientStream(ctx, ", descExpr, `, c.cc, "`, sname, `", opts...)`)
	g.P("if err != nil { return nil, err }")
	g.P("x := &", streamType, "{stream}")
	if !method.GetClientStreaming() {
		g.P("if err := x.ClientStream.SendMsg(in); err != nil { return nil, err }")
		g.P("if err := x.ClientStream.CloseSend(); err != nil { return nil, err }")
	}
	g.P("return x, nil")
	g.P("}")
	g.P()

	genSend := method.GetClientStreaming()
	genRecv := method.GetServerStreaming()
	genCloseAndRecv := !method.GetServerStreaming()

	// Stream auxiliary types and methods.
	g.P("type ", servName, "_", methName, "Client interface {")
	if genSend {
		g.P("Send(*", inType, ") error")
	}
	if genRecv {
		g.P("Recv() (*", outType, ", error)")
	}
	if genCloseAndRecv {
		g.P("CloseAndRecv() (*", outType, ", error)")
	}
	g.P(grpcPkg, ".ClientStream")
	g.P("}")
	g.P()

	g.P("type ", streamType, " struct {")
	g.P(grpcPkg, ".ClientStream")
	g.P("}")
	g.P()

	if genSend {
		g.P("func (x *", streamType, ") Send(m *", inType, ") error {")
		g.P("return x.ClientStream.SendMsg(m)")
		g.P("}")
		g.P()
	}
	if genRecv {
		g.P("func (x *", streamType, ") Recv() (*", outType, ", error) {")
		g.P("m := new(", outType, ")")
		g.P("if err := x.ClientStream.RecvMsg(m); err != nil { return nil, err }")
		g.P("return m, nil")
		g.P("}")
		g.P()
	}
	if genCloseAndRecv {
		g.P("func (x *", streamType, ") CloseAndRecv() (*", outType, ", error) {")
		g.P("if err := x.ClientStream.CloseSend(); err != nil { return nil, err }")
		g.P("m := new(", outType, ")")
		g.P("if err := x.ClientStream.RecvMsg(m); err != nil { return nil, err }")
		g.P("return m, nil")
		g.P("}")
		g.P()
	}
}

func (p *stringer) Generate(file *generator.FileDescriptor) {
	proto3 := gogoproto.IsProto3(file.FileDescriptorProto)
	p.PluginImports = generator.NewPluginImports(p.Generator)
	p.atleastOne = false

	p.localName = generator.FileName(file)

	fmtPkg := p.NewImport("fmt")
	stringsPkg := p.NewImport("strings")
	reflectPkg := p.NewImport("reflect")
	sortKeysPkg := p.NewImport("github.com/gogo/protobuf/sortkeys")
	for _, message := range file.Messages() {
		if !gogoproto.IsStringer(file.FileDescriptorProto, message.DescriptorProto) {
			continue
		}
		if gogoproto.EnabledGoStringer(file.FileDescriptorProto, message.DescriptorProto) {
			panic("old string method needs to be disabled, please use gogoproto.goproto_stringer or gogoproto.goproto_stringer_all and set it to false")
		}
		if message.DescriptorProto.GetOptions().GetMapEntry() {
			continue
		}
		p.atleastOne = true
		ccTypeName := generator.CamelCaseSlice(message.TypeName())
		p.P(`func (this *`, ccTypeName, `) String() string {`)
		p.In()
		p.P(`if this == nil {`)
		p.In()
		p.P(`return "nil"`)
		p.Out()
		p.P(`}`)
		for _, field := range message.Field {
			if !generator.IsMap(file.FileDescriptorProto, field) {
				continue
			}
			fieldname := p.GetFieldName(message, field)
			mapMsg := generator.GetMap(file.FileDescriptorProto, field)
			keyField, valueField := mapMsg.GetMapFields()
			keysName := `keysFor` + fieldname
			keygoTyp, _ := p.GoType(nil, keyField)
			keygoTyp = strings.Replace(keygoTyp, "*", "", 1)
			keyCapTyp := generator.CamelCase(keygoTyp)
			valuegoTyp, _ := p.GoType(nil, valueField)
			p.P(keysName, ` := make([]`, keygoTyp, `, 0, len(this.`, fieldname, `))`)
			p.P(`for k, _ := range this.`, fieldname, ` {`)
			p.In()
			p.P(keysName, ` = append(`, keysName, `, k)`)
			p.Out()
			p.P(`}`)
			p.P(sortKeysPkg.Use(), `.`, keyCapTyp, `s(`, keysName, `)`)
			mapName := `mapStringFor` + fieldname
			p.P(mapName, ` := "map[`, keygoTyp, `]`, valuegoTyp, `{"`)
			p.P(`for _, k := range `, keysName, ` {`)
			p.In()
			p.P(mapName, ` += fmt.Sprintf("%v: %v,", k, this.`, fieldname, `[k])`)
			p.Out()
			p.P(`}`)
			p.P(mapName, ` += "}"`)
		}
		p.P("s := ", stringsPkg.Use(), ".Join([]string{`&", ccTypeName, "{`,")
		for _, field := range message.Field {
			nullable := gogoproto.IsNullable(field)
			repeated := field.IsRepeated()
			fieldname := p.GetFieldName(message, field)
			if generator.IsMap(file.FileDescriptorProto, field) {
				mapName := `mapStringFor` + fieldname
				p.P("`", fieldname, ":`", ` + `, mapName, " + `,", "`,")
			} else if field.IsMessage() || p.IsGroup(field) {
				desc := p.ObjectNamed(field.GetTypeName())
				msgname := p.TypeName(desc)
				msgnames := strings.Split(msgname, ".")
				typeName := msgnames[len(msgnames)-1]
				if nullable {
					p.P("`", fieldname, ":`", ` + `, stringsPkg.Use(), `.Replace(`, fmtPkg.Use(), `.Sprintf("%v", this.`, fieldname, `), "`, typeName, `","`, msgname, `"`, ", 1) + `,", "`,")
				} else if repeated {
					p.P("`", fieldname, ":`", ` + `, stringsPkg.Use(), `.Replace(`, stringsPkg.Use(), `.Replace(`, fmtPkg.Use(), `.Sprintf("%v", this.`, fieldname, `), "`, typeName, `","`, msgname, `"`, ", 1),`&`,``,1) + `,", "`,")
				} else {
					p.P("`", fieldname, ":`", ` + `, stringsPkg.Use(), `.Replace(`, stringsPkg.Use(), `.Replace(this.`, fieldname, `.String(), "`, typeName, `","`, msgname, `"`, ", 1),`&`,``,1) + `,", "`,")
				}
			} else {
				if nullable && !repeated && !proto3 {
					p.P("`", fieldname, ":`", ` + valueToString`, p.localName, `(this.`, fieldname, ") + `,", "`,")
				} else {
					p.P("`", fieldname, ":`", ` + `, fmtPkg.Use(), `.Sprintf("%v", this.`, fieldname, ") + `,", "`,")
				}
			}
		}
		if message.DescriptorProto.HasExtension() {
			if gogoproto.HasExtensionsMap(file.FileDescriptorProto, message.DescriptorProto) {
				p.P("`XXX_extensions:` + proto.StringFromExtensionsMap(this.XXX_extensions) + `,`,")
			} else {
				p.P("`XXX_extensions:` + proto.StringFromExtensionsBytes(this.XXX_extensions) + `,`,")
			}
		}
		if gogoproto.HasUnrecognized(file.FileDescriptorProto, message.DescriptorProto) {
			p.P("`XXX_unrecognized:` + ", fmtPkg.Use(), `.Sprintf("%v", this.XXX_unrecognized) + `, "`,`,")
		}
		p.P("`}`,")
		p.P(`}`, `,""`, ")")
		p.P(`return s`)
		p.Out()
//.........这里部分代码省略.........