docker/swarmkit

package deepcopy

import (
    "github.com/gogo/protobuf/gogoproto"
    "github.com/gogo/protobuf/plugin/testgen"
    "github.com/gogo/protobuf/protoc-gen-gogo/generator"
)

type test struct {
    *generator.Generator
}

// NewTest creates a new deepcopy testgen plugin
func NewTest(g *generator.Generator) testgen.TestPlugin {
    return &test{g}
}

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()
        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 {
                fName = "Get" + fName + "()"
                if f.IsMessage() {
                    p.P(`if in.`, fName, ` != nil && in.`, fName, ` == out.`, fName, ` {`)
                    p.In()
                    p.P(`t.Fatalf("`, fName, `: %#v == %#v", in.`, fName, `, out.`, fName, `)`)
                    p.Out()
                    p.P(`}`)
                }
            } else {
                p.P(`if &in.`, fName, ` == &out.`, fName, ` {`)
                p.In()
                p.P(`t.Fatalf("`, fName, `: %#v == %#v", &in.`, fName, `, &out.`, fName, `)`)
                p.Out()
                p.P(`}`)
            }

            if f.IsBytes() {
                if f.IsRepeated() {
                    p.P(`if len(in.`, fName, `) > 0 {`)
                    p.In()
                    fName += "[0]"
                }
                p.P(`if len(in.`, fName, `) > 0 {`)
                p.In()
                p.P(`in.`, fName, "[0]++")
                p.P(`if in.Equal(out) {`)
                p.In()
                p.P(`t.Fatalf("%#v == %#v", in, out)`)
                p.Out()
                p.P(`}`)
                p.Out()
                p.P(`}`)
                if f.IsRepeated() {
                    p.Out()
                    p.P(`}`)
                }
            }
        }

        // copying from nil should result in nil
        p.P()
        p.P(`in = nil`)
        p.P(`out = in.Copy()`)
        p.P(`if out != nil {`)
        p.In()
        p.P(`t.Fatalf("copying nil should return nil, returned: %#v", out)`)
        p.Out()
        p.P(`}`)

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

    return used
}

func init() {
    testgen.RegisterTestPlugin(NewTest)
}