forked from golang/protobuf
/
main.go
132 lines (120 loc) · 4.49 KB
/
main.go
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:generate go run . -execute
package main
import (
"flag"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"github.com/averyboy/protobuf/proto"
gengo "google.golang.org/protobuf/cmd/protoc-gen-go/internal_gengo"
"google.golang.org/protobuf/compiler/protogen"
"google.golang.org/protobuf/reflect/protodesc"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/types/descriptorpb"
"google.golang.org/protobuf/types/known/anypb"
"google.golang.org/protobuf/types/known/durationpb"
"google.golang.org/protobuf/types/known/emptypb"
"google.golang.org/protobuf/types/known/structpb"
"google.golang.org/protobuf/types/known/timestamppb"
"google.golang.org/protobuf/types/known/wrapperspb"
"google.golang.org/protobuf/types/pluginpb"
)
func main() {
run := flag.Bool("execute", false, "Write generated files to destination.")
flag.Parse()
// Set of generated proto packages to forward to v2.
files := []struct {
oldGoPkg string
newGoPkg string
pbDesc protoreflect.FileDescriptor
}{{
oldGoPkg: "github.com/averyboy/protobuf/protoc-gen-go/descriptor;descriptor",
newGoPkg: "google.golang.org/protobuf/types/descriptorpb",
pbDesc: descriptorpb.File_google_protobuf_descriptor_proto,
}, {
oldGoPkg: "github.com/averyboy/protobuf/protoc-gen-go/plugin;plugin_go",
newGoPkg: "google.golang.org/protobuf/types/pluginpb",
pbDesc: pluginpb.File_google_protobuf_compiler_plugin_proto,
}, {
oldGoPkg: "github.com/averyboy/protobuf/ptypes/any;any",
newGoPkg: "google.golang.org/protobuf/types/known/anypb",
pbDesc: anypb.File_google_protobuf_any_proto,
}, {
oldGoPkg: "github.com/averyboy/protobuf/ptypes/duration;duration",
newGoPkg: "google.golang.org/protobuf/types/known/durationpb",
pbDesc: durationpb.File_google_protobuf_duration_proto,
}, {
oldGoPkg: "github.com/averyboy/protobuf/ptypes/timestamp;timestamp",
newGoPkg: "google.golang.org/protobuf/types/known/timestamppb",
pbDesc: timestamppb.File_google_protobuf_timestamp_proto,
}, {
oldGoPkg: "github.com/averyboy/protobuf/ptypes/wrappers;wrappers",
newGoPkg: "google.golang.org/protobuf/types/known/wrapperspb",
pbDesc: wrapperspb.File_google_protobuf_wrappers_proto,
}, {
oldGoPkg: "github.com/averyboy/protobuf/ptypes/struct;structpb",
newGoPkg: "google.golang.org/protobuf/types/known/structpb",
pbDesc: structpb.File_google_protobuf_struct_proto,
}, {
oldGoPkg: "github.com/averyboy/protobuf/ptypes/empty;empty",
newGoPkg: "google.golang.org/protobuf/types/known/emptypb",
pbDesc: emptypb.File_google_protobuf_empty_proto,
}}
// For each package, construct a proto file that public imports the package.
var req pluginpb.CodeGeneratorRequest
var flags []string
for _, file := range files {
pkgPath := file.oldGoPkg[:strings.IndexByte(file.oldGoPkg, ';')]
fd := &descriptorpb.FileDescriptorProto{
Name: proto.String(pkgPath + "/" + path.Base(pkgPath) + ".proto"),
Syntax: proto.String(file.pbDesc.Syntax().String()),
Dependency: []string{file.pbDesc.Path()},
PublicDependency: []int32{0},
Options: &descriptorpb.FileOptions{GoPackage: proto.String(file.oldGoPkg)},
}
req.ProtoFile = append(req.ProtoFile, protodesc.ToFileDescriptorProto(file.pbDesc), fd)
req.FileToGenerate = append(req.FileToGenerate, fd.GetName())
flags = append(flags, "M"+file.pbDesc.Path()+"="+file.newGoPkg)
}
req.Parameter = proto.String(strings.Join(flags, ","))
// Use the internal logic of protoc-gen-go to generate the files.
gen, err := protogen.Options{}.New(&req)
check(err)
for _, file := range gen.Files {
if file.Generate {
gengo.GenerateVersionMarkers = false
gengo.GenerateFile(gen, file)
}
}
// Write the generated files.
resp := gen.Response()
if resp.Error != nil {
panic("gengo error: " + resp.GetError())
}
for _, file := range resp.File {
relPath, err := filepath.Rel(filepath.FromSlash("github.com/averyboy/protobuf"), file.GetName())
check(err)
check(ioutil.WriteFile(relPath+".bak", []byte(file.GetContent()), 0664))
if *run {
fmt.Println("#", relPath)
check(os.Rename(relPath+".bak", relPath))
} else {
cmd := exec.Command("diff", relPath, relPath+".bak", "-N", "-u")
cmd.Stdout = os.Stdout
cmd.Run()
os.Remove(relPath + ".bak") // best-effort delete
}
}
}
func check(err error) {
if err != nil {
panic(err)
}
}