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- // Copyright 2016 Google Inc.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- // +build ignore
-
- // Regen.go regenerates the genproto repository.
- //
- // Regen.go recursively walks through each directory named by given arguments,
- // looking for all .proto files. (Symlinks are not followed.)
- // If the pkg_prefix flag is not an empty string,
- // any proto file without `go_package` option
- // or whose option does not begin with the prefix is ignored.
- // If multiple roots contain files with the same name,
- // eg "root1/path/to/file" and "root2/path/to/file",
- // only the first file is processed; the rest are ignored.
- // Protoc is executed on remaining files,
- // one invocation per set of files declaring the same Go package.
- package main
-
- import (
- "flag"
- "fmt"
- "io/ioutil"
- "log"
- "os"
- "os/exec"
- "path/filepath"
- "regexp"
- "strconv"
- "strings"
- )
-
- var goPkgOptRe = regexp.MustCompile(`(?m)^option go_package = (.*);`)
-
- func usage() {
- fmt.Fprintln(os.Stderr, `usage: go run regen.go -go_out=path/to/output [-pkg_prefix=pkg/prefix] roots...
-
- Most users will not need to run this file directly.
- To regenerate this repository, run regen.sh instead.`)
- flag.PrintDefaults()
- }
-
- func main() {
- goOutDir := flag.String("go_out", "", "go_out argument to pass to protoc-gen-go")
- pkgPrefix := flag.String("pkg_prefix", "", "only include proto files with go_package starting with this prefix")
- flag.Usage = usage
- flag.Parse()
-
- if *goOutDir == "" {
- log.Fatal("need go_out flag")
- }
-
- seenFiles := make(map[string]bool)
- pkgFiles := make(map[string][]string)
- for _, root := range flag.Args() {
- walkFn := func(path string, info os.FileInfo, err error) error {
- if err != nil {
- return err
- }
- if !info.Mode().IsRegular() || !strings.HasSuffix(path, ".proto") {
- return nil
- }
-
- switch rel, err := filepath.Rel(root, path); {
- case err != nil:
- return err
- case seenFiles[rel]:
- return nil
- default:
- seenFiles[rel] = true
- }
-
- pkg, err := goPkg(path)
- if err != nil {
- return err
- }
- pkgFiles[pkg] = append(pkgFiles[pkg], path)
- return nil
- }
- if err := filepath.Walk(root, walkFn); err != nil {
- log.Fatal(err)
- }
- }
- for pkg, fnames := range pkgFiles {
- if !strings.HasPrefix(pkg, *pkgPrefix) {
- continue
- }
- if out, err := protoc(*goOutDir, flag.Args(), fnames); err != nil {
- log.Fatalf("error executing protoc: %s\n%s", err, out)
- }
- }
- }
-
- // goPkg reports the import path declared in the given file's
- // `go_package` option. If the option is missing, goPkg returns empty string.
- func goPkg(fname string) (string, error) {
- content, err := ioutil.ReadFile(fname)
- if err != nil {
- return "", err
- }
-
- var pkgName string
- if match := goPkgOptRe.FindSubmatch(content); len(match) > 0 {
- pn, err := strconv.Unquote(string(match[1]))
- if err != nil {
- return "", err
- }
- pkgName = pn
- }
- if p := strings.IndexRune(pkgName, ';'); p > 0 {
- pkgName = pkgName[:p]
- }
- return pkgName, nil
- }
-
- // protoc executes the "protoc" command on files named in fnames,
- // passing go_out and include flags specified in goOut and includes respectively.
- // protoc returns combined output from stdout and stderr.
- func protoc(goOut string, includes, fnames []string) ([]byte, error) {
- args := []string{"--go_out=plugins=grpc:" + goOut}
- for _, inc := range includes {
- args = append(args, "-I", inc)
- }
- args = append(args, fnames...)
- return exec.Command("protoc", args...).CombinedOutput()
- }
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