/
genproto.go
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/
genproto.go
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// Copyright 2019 Google LLC
//
// 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.
package generator
import (
"context"
"errors"
"fmt"
"io/ioutil"
"log"
"path/filepath"
"regexp"
"strconv"
"strings"
"cloud.google.com/go/internal/gapicgen/execv"
"cloud.google.com/go/internal/gapicgen/git"
"golang.org/x/sync/errgroup"
)
var goPkgOptRe = regexp.MustCompile(`(?m)^option go_package = (.*);`)
// denylist is a set of clients to NOT generate.
var denylist = map[string]bool{
// TODO(codyoss): re-enable after issue is resolve -- https://github.com/googleapis/go-genproto/issues/357
"google.golang.org/genproto/googleapis/cloud/recommendationengine/v1beta1": true,
// These two container APIs are currently frozen. They should not be updated
// due to manual layer built on top of them.
"google.golang.org/genproto/googleapis/grafeas/v1": true,
"google.golang.org/genproto/googleapis/devtools/containeranalysis/v1": true,
}
// GenprotoGenerator is used to generate code for googleapis/go-genproto.
type GenprotoGenerator struct {
genprotoDir string
googleapisDir string
protoSrcDir string
}
// NewGenprotoGenerator creates a new GenprotoGenerator.
func NewGenprotoGenerator(c *Config) *GenprotoGenerator {
return &GenprotoGenerator{
genprotoDir: c.GenprotoDir,
googleapisDir: c.GoogleapisDir,
protoSrcDir: filepath.Join(c.ProtoDir, "/src"),
}
}
var skipPrefixes = []string{
"google.golang.org/genproto/googleapis/ads",
}
func hasPrefix(s string, prefixes []string) bool {
for _, prefix := range prefixes {
if strings.HasPrefix(s, prefix) {
return true
}
}
return false
}
// Regen regenerates the genproto repository.
// regenGenproto regenerates the genproto repository.
//
// regenGenproto recursively walks through each directory named by given
// arguments, looking for all .proto files. (Symlinks are not followed.) Any
// proto file without `go_package` option or whose option does not begin with
// the genproto 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.
func (g *GenprotoGenerator) Regen(ctx context.Context) error {
log.Println("regenerating genproto")
// Create space to put generated .pb.go's.
c := execv.Command("mkdir", "generated")
c.Dir = g.genprotoDir
if err := c.Run(); err != nil {
return err
}
// Get the last processed googleapis hash.
lastHash, err := ioutil.ReadFile(filepath.Join(g.genprotoDir, "regen.txt"))
if err != nil {
return err
}
pkgFiles, err := g.getUpdatedPackages(string(lastHash))
if err != nil {
return err
}
if len(pkgFiles) == 0 {
return errors.New("couldn't find any pkgfiles")
}
log.Println("generating from protos")
grp, _ := errgroup.WithContext(ctx)
for pkg, fileNames := range pkgFiles {
if !strings.HasPrefix(pkg, "google.golang.org/genproto") || denylist[pkg] || hasPrefix(pkg, skipPrefixes) {
continue
}
pk := pkg
fn := fileNames
grp.Go(func() error {
log.Println("running protoc on", pk)
return g.protoc(fn)
})
}
if err := grp.Wait(); err != nil {
return err
}
if err := g.moveAndCleanupGeneratedSrc(); err != nil {
return err
}
if err := vet(g.genprotoDir); err != nil {
return err
}
if err := build(g.genprotoDir); err != nil {
return err
}
return nil
}
// 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(fileName string) (string, error) {
content, err := ioutil.ReadFile(fileName)
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 fileNames, and outputs
// to "<genprotoDir>/generated".
func (g *GenprotoGenerator) protoc(fileNames []string) error {
args := []string{"--experimental_allow_proto3_optional", fmt.Sprintf("--go_out=plugins=grpc:%s/generated", g.genprotoDir), "-I", g.googleapisDir, "-I", g.protoSrcDir}
args = append(args, fileNames...)
c := execv.Command("protoc", args...)
c.Dir = g.genprotoDir
return c.Run()
}
// getUpdatedPackages parses all of the new commits to find what packages need
// to be regenerated.
func (g *GenprotoGenerator) getUpdatedPackages(googleapisHash string) (map[string][]string, error) {
files, err := git.UpdateFilesSinceHash(g.googleapisDir, googleapisHash)
if err != nil {
return nil, err
}
pkgFiles := make(map[string][]string)
for _, v := range files {
if !strings.HasSuffix(v, ".proto") {
continue
}
path := filepath.Join(g.googleapisDir, v)
pkg, err := goPkg(path)
if err != nil {
return nil, err
}
pkgFiles[pkg] = append(pkgFiles[pkg], path)
}
return pkgFiles, nil
}
// moveAndCleanupGeneratedSrc moves all generated src to their correct locations
// in the repository, because protoc puts it in a folder called `generated/``.
func (g *GenprotoGenerator) moveAndCleanupGeneratedSrc() error {
log.Println("moving generated code")
// The period at the end is analogous to * (copy everything in this dir).
c := execv.Command("cp", "-R", filepath.Join(g.genprotoDir, "generated", "google.golang.org", "genproto", "googleapis"), g.genprotoDir)
if err := c.Run(); err != nil {
return err
}
c = execv.Command("rm", "-rf", "generated")
c.Dir = g.genprotoDir
if err := c.Run(); err != nil {
return err
}
return nil
}