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// Command protoc-gen-gitaly-protolist is designed to be used as a protobuf compiler to generate a
// list of protobuf files via a publicly accessible variable.
//
// This plugin can be accessed by invoking the protoc compiler with the following arguments:
//
// protoc --plugin=protoc-gen-gitaly-protolist --gitaly_protolist_out=.
//
// The plugin accepts a protobuf message in STDIN that describes the parsed protobuf files. A
// response is sent back on STDOUT that contains any errors.
package main
import (
"bytes"
"fmt"
"go/format"
"io"
"log"
"os"
"path/filepath"
"strings"
"text/template"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/pluginpb"
)
const (
gitalyProtoDirArg = "proto_dir"
gitalypbDirArg = "gitalypb_dir"
)
func main() {
data, err := io.ReadAll(os.Stdin)
if err != nil {
log.Fatalf("reading input: %s", err)
}
req := &pluginpb.CodeGeneratorRequest{}
if err := proto.Unmarshal(data, req); err != nil {
log.Fatalf("parsing input proto: %s", err)
}
if err := generateProtolistGo(req); err != nil {
log.Fatal(err)
}
}
func parseArgs(argString string) (gitalyProtoDir string, gitalypbDir string) {
for _, arg := range strings.Split(argString, ",") {
argKeyValue := strings.Split(arg, "=")
if len(argKeyValue) != 2 {
continue
}
switch argKeyValue[0] {
case gitalyProtoDirArg:
gitalyProtoDir = argKeyValue[1]
case gitalypbDirArg:
gitalypbDir = argKeyValue[1]
}
}
return gitalyProtoDir, gitalypbDir
}
func generateProtolistGo(req *pluginpb.CodeGeneratorRequest) error {
var err error
gitalyProtoDir, gitalypbDir := parseArgs(req.GetParameter())
if gitalyProtoDir == "" {
return fmt.Errorf("%s not provided", gitalyProtoDirArg)
}
if gitalypbDir == "" {
return fmt.Errorf("%s not provided", gitalypbDirArg)
}
var protoNames []string
if gitalyProtoDir, err = filepath.Abs(gitalyProtoDir); err != nil {
return fmt.Errorf("failed to get absolute path for %s: %v", gitalyProtoDir, err)
}
files, err := os.ReadDir(gitalyProtoDir)
if err != nil {
return fmt.Errorf("failed to read %s: %v", gitalyProtoDir, err)
}
for _, fi := range files {
if !fi.IsDir() && strings.HasSuffix(fi.Name(), ".proto") {
protoNames = append(protoNames, fmt.Sprintf(`"%s"`, fi.Name()))
}
}
f, err := os.Create(filepath.Join(gitalypbDir, "protolist.go"))
if err != nil {
return fmt.Errorf("could not create protolist.go: %v", err)
}
defer f.Close()
if err = renderProtoList(f, protoNames); err != nil {
return fmt.Errorf("could not render go code: %v", err)
}
return nil
}
// renderProtoList generate a go file with a list of gitaly protos
func renderProtoList(dest io.WriteCloser, protoNames []string) error {
joinFunc := template.FuncMap{"join": strings.Join}
protoList := `package gitalypb
// Code generated by protoc-gen-gitaly. DO NOT EDIT
// GitalyProtos is a list of gitaly protobuf files
var GitalyProtos = []string{
{{join . ",\n"}},
}
`
protoListTempl, err := template.New("protoList").Funcs(joinFunc).Parse(protoList)
if err != nil {
return fmt.Errorf("could not create go code template: %v", err)
}
var rawGo bytes.Buffer
if err := protoListTempl.Execute(&rawGo, protoNames); err != nil {
return fmt.Errorf("could not execute go code template: %v", err)
}
formattedGo, err := format.Source(rawGo.Bytes())
if err != nil {
return fmt.Errorf("could not format go code: %v", err)
}
if _, err = io.Copy(dest, bytes.NewBuffer(formattedGo)); err != nil {
return fmt.Errorf("failed to write protolist.go file: %v", err)
}
return nil
}
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