233 lines
6.8 KiB
Go
233 lines
6.8 KiB
Go
// Protocol Buffers for Go with Gadgets
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//
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// Copyright (c) 2013, The GoGo Authors. All rights reserved.
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// http://github.com/gogo/protobuf
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/*
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The face plugin generates a function will be generated which can convert a structure which satisfies an interface (face) to the specified structure.
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This interface contains getters for each of the fields in the struct.
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The specified struct is also generated with the getters.
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This means that getters should be turned off so as not to conflict with face getters.
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This allows it to satisfy its own face.
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It is enabled by the following extensions:
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- face
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- face_all
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Turn off getters by using the following extensions:
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- getters
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- getters_all
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The face plugin also generates a test given it is enabled using one of the following extensions:
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- testgen
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- testgen_all
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Let us look at:
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github.com/gogo/protobuf/test/example/example.proto
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Btw all the output can be seen at:
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github.com/gogo/protobuf/test/example/*
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The following message:
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message A {
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option (gogoproto.face) = true;
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option (gogoproto.goproto_getters) = false;
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optional string Description = 1 [(gogoproto.nullable) = false];
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optional int64 Number = 2 [(gogoproto.nullable) = false];
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optional bytes Id = 3 [(gogoproto.customtype) = "github.com/gogo/protobuf/test/custom.Uuid", (gogoproto.nullable) = false];
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}
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given to the face plugin, will generate the following code:
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type AFace interface {
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Proto() github_com_gogo_protobuf_proto.Message
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GetDescription() string
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GetNumber() int64
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GetId() github_com_gogo_protobuf_test_custom.Uuid
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}
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func (this *A) Proto() github_com_gogo_protobuf_proto.Message {
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return this
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}
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func (this *A) TestProto() github_com_gogo_protobuf_proto.Message {
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return NewAFromFace(this)
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}
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func (this *A) GetDescription() string {
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return this.Description
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}
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func (this *A) GetNumber() int64 {
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return this.Number
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}
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func (this *A) GetId() github_com_gogo_protobuf_test_custom.Uuid {
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return this.Id
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}
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func NewAFromFace(that AFace) *A {
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this := &A{}
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this.Description = that.GetDescription()
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this.Number = that.GetNumber()
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this.Id = that.GetId()
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return this
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}
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and the following test code:
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func TestAFace(t *testing7.T) {
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popr := math_rand7.New(math_rand7.NewSource(time7.Now().UnixNano()))
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p := NewPopulatedA(popr, true)
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msg := p.TestProto()
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if !p.Equal(msg) {
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t.Fatalf("%#v !Face Equal %#v", msg, p)
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}
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}
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The struct A, representing the message, will also be generated just like always.
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As you can see A satisfies its own Face, AFace.
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Creating another struct which satisfies AFace is very easy.
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Simply create all these methods specified in AFace.
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Implementing The Proto method is done with the helper function NewAFromFace:
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func (this *MyStruct) Proto() proto.Message {
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return NewAFromFace(this)
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}
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just the like TestProto method which is used to test the NewAFromFace function.
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*/
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package face
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import (
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"github.com/gogo/protobuf/gogoproto"
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"github.com/gogo/protobuf/protoc-gen-gogo/generator"
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)
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type plugin struct {
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*generator.Generator
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generator.PluginImports
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}
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func NewPlugin() *plugin {
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return &plugin{}
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}
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func (p *plugin) Name() string {
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return "face"
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}
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func (p *plugin) Init(g *generator.Generator) {
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p.Generator = g
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}
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func (p *plugin) Generate(file *generator.FileDescriptor) {
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p.PluginImports = generator.NewPluginImports(p.Generator)
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protoPkg := p.NewImport("github.com/gogo/protobuf/proto")
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if !gogoproto.ImportsGoGoProto(file.FileDescriptorProto) {
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protoPkg = p.NewImport("github.com/golang/protobuf/proto")
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}
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for _, message := range file.Messages() {
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if !gogoproto.IsFace(file.FileDescriptorProto, message.DescriptorProto) {
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continue
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}
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if message.DescriptorProto.GetOptions().GetMapEntry() {
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continue
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}
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if message.DescriptorProto.HasExtension() {
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panic("face does not support message with extensions")
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}
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if gogoproto.HasGoGetters(file.FileDescriptorProto, message.DescriptorProto) {
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panic("face requires getters to be disabled please use gogoproto.getters or gogoproto.getters_all and set it to false")
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}
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ccTypeName := generator.CamelCaseSlice(message.TypeName())
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p.P(`type `, ccTypeName, `Face interface{`)
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p.In()
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p.P(`Proto() `, protoPkg.Use(), `.Message`)
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for _, field := range message.Field {
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fieldname := p.GetFieldName(message, field)
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goTyp, _ := p.GoType(message, field)
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if p.IsMap(field) {
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m := p.GoMapType(nil, field)
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goTyp = m.GoType
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}
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p.P(`Get`, fieldname, `() `, goTyp)
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}
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p.Out()
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p.P(`}`)
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p.P(``)
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p.P(`func (this *`, ccTypeName, `) Proto() `, protoPkg.Use(), `.Message {`)
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p.In()
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p.P(`return this`)
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p.Out()
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p.P(`}`)
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p.P(``)
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p.P(`func (this *`, ccTypeName, `) TestProto() `, protoPkg.Use(), `.Message {`)
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p.In()
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p.P(`return New`, ccTypeName, `FromFace(this)`)
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p.Out()
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p.P(`}`)
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p.P(``)
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for _, field := range message.Field {
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fieldname := p.GetFieldName(message, field)
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goTyp, _ := p.GoType(message, field)
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if p.IsMap(field) {
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m := p.GoMapType(nil, field)
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goTyp = m.GoType
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}
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p.P(`func (this *`, ccTypeName, `) Get`, fieldname, `() `, goTyp, `{`)
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p.In()
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p.P(` return this.`, fieldname)
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p.Out()
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p.P(`}`)
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p.P(``)
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}
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p.P(``)
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p.P(`func New`, ccTypeName, `FromFace(that `, ccTypeName, `Face) *`, ccTypeName, ` {`)
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p.In()
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p.P(`this := &`, ccTypeName, `{}`)
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for _, field := range message.Field {
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fieldname := p.GetFieldName(message, field)
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p.P(`this.`, fieldname, ` = that.Get`, fieldname, `()`)
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}
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p.P(`return this`)
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p.Out()
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p.P(`}`)
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p.P(``)
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}
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}
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func init() {
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generator.RegisterPlugin(NewPlugin())
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}
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