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