sing-box/cmd/internal/protogen/main.go

219 lines
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Go
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2022-08-22 10:53:47 +00:00
package main
import (
"bufio"
"bytes"
"fmt"
"go/build"
"io"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
)
// envFile returns the name of the Go environment configuration file.
// Copy from https://github.com/golang/go/blob/c4f2a9788a7be04daf931ac54382fbe2cb754938/src/cmd/go/internal/cfg/cfg.go#L150-L166
func envFile() (string, error) {
if file := os.Getenv("GOENV"); file != "" {
if file == "off" {
return "", fmt.Errorf("GOENV=off")
}
return file, nil
}
dir, err := os.UserConfigDir()
if err != nil {
return "", err
}
if dir == "" {
return "", fmt.Errorf("missing user-config dir")
}
return filepath.Join(dir, "go", "env"), nil
}
// GetRuntimeEnv returns the value of runtime environment variable,
// that is set by running following command: `go env -w key=value`.
func GetRuntimeEnv(key string) (string, error) {
file, err := envFile()
if err != nil {
return "", err
}
if file == "" {
return "", fmt.Errorf("missing runtime env file")
}
var data []byte
var runtimeEnv string
data, readErr := os.ReadFile(file)
if readErr != nil {
return "", readErr
}
envStrings := strings.Split(string(data), "\n")
for _, envItem := range envStrings {
envItem = strings.TrimSuffix(envItem, "\r")
envKeyValue := strings.Split(envItem, "=")
if strings.EqualFold(strings.TrimSpace(envKeyValue[0]), key) {
runtimeEnv = strings.TrimSpace(envKeyValue[1])
}
}
return runtimeEnv, nil
}
// GetGOBIN returns GOBIN environment variable as a string. It will NOT be empty.
func GetGOBIN() string {
// The one set by user explicitly by `export GOBIN=/path` or `env GOBIN=/path command`
GOBIN := os.Getenv("GOBIN")
if GOBIN == "" {
var err error
// The one set by user by running `go env -w GOBIN=/path`
GOBIN, err = GetRuntimeEnv("GOBIN")
if err != nil {
// The default one that Golang uses
return filepath.Join(build.Default.GOPATH, "bin")
}
if GOBIN == "" {
return filepath.Join(build.Default.GOPATH, "bin")
}
return GOBIN
}
return GOBIN
}
func main() {
pwd, err := os.Getwd()
if err != nil {
fmt.Println("Can not get current working directory.")
os.Exit(1)
}
GOBIN := GetGOBIN()
binPath := os.Getenv("PATH")
pathSlice := []string{pwd, GOBIN, binPath}
binPath = strings.Join(pathSlice, string(os.PathListSeparator))
os.Setenv("PATH", binPath)
suffix := ""
if runtime.GOOS == "windows" {
suffix = ".exe"
}
protoc := "protoc"
if linkPath, err := os.Readlink(protoc); err == nil {
protoc = linkPath
}
protoFilesMap := make(map[string][]string)
walkErr := filepath.Walk("./", func(path string, info os.FileInfo, err error) error {
if err != nil {
fmt.Println(err)
return err
}
if info.IsDir() {
return nil
}
dir := filepath.Dir(path)
filename := filepath.Base(path)
if strings.HasSuffix(filename, ".proto") &&
filename != "typed_message.proto" &&
filename != "descriptor.proto" {
protoFilesMap[dir] = append(protoFilesMap[dir], path)
}
return nil
})
if walkErr != nil {
fmt.Println(walkErr)
os.Exit(1)
}
for _, files := range protoFilesMap {
for _, relProtoFile := range files {
args := []string{
"-I", ".",
"--go_out", pwd,
"--go_opt", "paths=source_relative",
"--go-grpc_out", pwd,
"--go-grpc_opt", "paths=source_relative",
"--plugin", "protoc-gen-go=" + filepath.Join(GOBIN, "protoc-gen-go"+suffix),
"--plugin", "protoc-gen-go-grpc=" + filepath.Join(GOBIN, "protoc-gen-go-grpc"+suffix),
}
args = append(args, relProtoFile)
cmd := exec.Command(protoc, args...)
cmd.Env = append(cmd.Env, os.Environ()...)
output, cmdErr := cmd.CombinedOutput()
if len(output) > 0 {
fmt.Println(string(output))
}
if cmdErr != nil {
fmt.Println(cmdErr)
os.Exit(1)
}
}
}
normalizeWalkErr := filepath.Walk("./", func(path string, info os.FileInfo, err error) error {
if err != nil {
fmt.Println(err)
return err
}
if info.IsDir() {
return nil
}
filename := filepath.Base(path)
if strings.HasSuffix(filename, ".pb.go") &&
path != "config.pb.go" {
if err := NormalizeGeneratedProtoFile(path); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
return nil
})
if normalizeWalkErr != nil {
fmt.Println(normalizeWalkErr)
os.Exit(1)
}
}
func NormalizeGeneratedProtoFile(path string) error {
fd, err := os.OpenFile(path, os.O_RDWR, 0o644)
if err != nil {
return err
}
_, err = fd.Seek(0, io.SeekStart)
if err != nil {
return err
}
out := bytes.NewBuffer(nil)
scanner := bufio.NewScanner(fd)
valid := false
for scanner.Scan() {
if !valid && !strings.HasPrefix(scanner.Text(), "package ") {
continue
}
valid = true
out.Write(scanner.Bytes())
out.Write([]byte("\n"))
}
_, err = fd.Seek(0, io.SeekStart)
if err != nil {
return err
}
err = fd.Truncate(0)
if err != nil {
return err
}
_, err = io.Copy(fd, bytes.NewReader(out.Bytes()))
if err != nil {
return err
}
return nil
}