blob: 734aa26fef1a7954fd76ec323eb014c17b5a67a5 [file] [log] [blame]
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:generate go run . -execute
package main
import (
"flag"
"fmt"
"go/format"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"regexp"
"sort"
"strings"
gengogrpc "google.golang.org/protobuf/cmd/protoc-gen-go-grpc/internal_gengogrpc"
gengo "google.golang.org/protobuf/cmd/protoc-gen-go/internal_gengo"
"google.golang.org/protobuf/compiler/protogen"
"google.golang.org/protobuf/internal/detrand"
"google.golang.org/protobuf/reflect/protoreflect"
)
func init() {
// Determine repository root path.
out, err := exec.Command("git", "rev-parse", "--show-toplevel").CombinedOutput()
check(err)
repoRoot = strings.TrimSpace(string(out))
// Determine the module path.
cmd := exec.Command("go", "list", "-m", "-f", "{{.Path}}")
cmd.Dir = repoRoot
out, err = cmd.CombinedOutput()
check(err)
modulePath = strings.TrimSpace(string(out))
// When the environment variable RUN_AS_PROTOC_PLUGIN is set,
// we skip running main and instead act as a protoc plugin.
// This allows the binary to pass itself to protoc.
if plugins := os.Getenv("RUN_AS_PROTOC_PLUGIN"); plugins != "" {
// Disable deliberate output instability for generated files.
// This is reasonable since we fully control the output.
detrand.Disable()
protogen.Run(nil, func(gen *protogen.Plugin) error {
for _, plugin := range strings.Split(plugins, ",") {
for _, file := range gen.Files {
if file.Generate {
switch plugin {
case "go":
gengo.GenerateVersionMarkers = false
gengo.GenerateFile(gen, file)
generateFieldNumbers(gen, file)
case "gogrpc":
gengogrpc.GenerateFile(gen, file)
}
}
}
}
return nil
})
os.Exit(0)
}
}
var (
run bool
protoRoot string
repoRoot string
modulePath string
generatedPreamble = []string{
"// Copyright 2019 The Go Authors. All rights reserved.",
"// Use of this source code is governed by a BSD-style.",
"// license that can be found in the LICENSE file.",
"",
"// Code generated by generate-protos. DO NOT EDIT.",
"",
}
)
func main() {
flag.BoolVar(&run, "execute", false, "Write generated files to destination.")
flag.StringVar(&protoRoot, "protoroot", os.Getenv("PROTOBUF_ROOT"), "The root of the protobuf source tree.")
flag.Parse()
if protoRoot == "" {
panic("protobuf source root is not set")
}
generateLocalProtos()
generateRemoteProtos()
}
func generateLocalProtos() {
tmpDir, err := ioutil.TempDir(repoRoot, "tmp")
check(err)
defer os.RemoveAll(tmpDir)
// Generate all local proto files (except version-locked files).
dirs := []struct {
path string
grpcPlugin bool
annotateFor map[string]bool
exclude map[string]bool
}{
{path: "cmd/protoc-gen-go/testdata", annotateFor: map[string]bool{"annotations/annotations.proto": true}},
{path: "cmd/protoc-gen-go-grpc/testdata", grpcPlugin: true},
{path: "internal/testprotos", exclude: map[string]bool{"irregular/irregular.proto": true}},
{path: "encoding/testprotos"},
{path: "reflect/protoregistry/testprotos"},
}
semVerRx := regexp.MustCompile(`v[0-9]+\.[0-9]+\.[0-9]+`)
for _, d := range dirs {
subDirs := map[string]bool{}
dstDir := filepath.Join(tmpDir, filepath.FromSlash(d.path))
check(os.MkdirAll(dstDir, 0775))
srcDir := filepath.Join(repoRoot, filepath.FromSlash(d.path))
filepath.Walk(srcDir, func(srcPath string, _ os.FileInfo, _ error) error {
if !strings.HasSuffix(srcPath, ".proto") || semVerRx.MatchString(srcPath) {
return nil
}
relPath, err := filepath.Rel(srcDir, srcPath)
check(err)
subDirs[filepath.Dir(relPath)] = true
if d.exclude[filepath.ToSlash(relPath)] {
return nil
}
// Emit a .meta file for certain files.
var opts string
if d.annotateFor[filepath.ToSlash(relPath)] {
opts = ",annotate_code"
}
// Determine which set of plugins to use.
plugins := "go"
if d.grpcPlugin {
plugins += ",gogrpc"
}
protoc(plugins, "-I"+filepath.Join(protoRoot, "src"), "-I"+srcDir, "--go_out=paths=source_relative"+opts+":"+dstDir, relPath)
return nil
})
// For directories in testdata, generate a test that links in all
// generated packages to ensure that it builds and initializes properly.
// This is done because "go build ./..." does not build sub-packages
// under testdata.
if filepath.Base(d.path) == "testdata" {
var imports []string
for sd := range subDirs {
imports = append(imports, fmt.Sprintf("_ %q", path.Join(modulePath, d.path, filepath.ToSlash(sd))))
}
sort.Strings(imports)
s := strings.Join(append(generatedPreamble, []string{
"package main",
"",
"import (" + strings.Join(imports, "\n") + ")",
}...), "\n")
b, err := format.Source([]byte(s))
check(err)
check(ioutil.WriteFile(filepath.Join(tmpDir, filepath.FromSlash(d.path+"/gen_test.go")), b, 0664))
}
}
syncOutput(repoRoot, tmpDir)
}
func generateRemoteProtos() {
tmpDir, err := ioutil.TempDir(repoRoot, "tmp")
check(err)
defer os.RemoveAll(tmpDir)
// Generate all remote proto files.
files := []struct{ prefix, path string }{
{"", "conformance/conformance.proto"},
{"benchmarks", "benchmarks.proto"},
{"benchmarks", "datasets/google_message1/proto2/benchmark_message1_proto2.proto"},
{"benchmarks", "datasets/google_message1/proto3/benchmark_message1_proto3.proto"},
{"benchmarks", "datasets/google_message2/benchmark_message2.proto"},
{"benchmarks", "datasets/google_message3/benchmark_message3.proto"},
{"benchmarks", "datasets/google_message3/benchmark_message3_1.proto"},
{"benchmarks", "datasets/google_message3/benchmark_message3_2.proto"},
{"benchmarks", "datasets/google_message3/benchmark_message3_3.proto"},
{"benchmarks", "datasets/google_message3/benchmark_message3_4.proto"},
{"benchmarks", "datasets/google_message3/benchmark_message3_5.proto"},
{"benchmarks", "datasets/google_message3/benchmark_message3_6.proto"},
{"benchmarks", "datasets/google_message3/benchmark_message3_7.proto"},
{"benchmarks", "datasets/google_message3/benchmark_message3_8.proto"},
{"benchmarks", "datasets/google_message4/benchmark_message4.proto"},
{"benchmarks", "datasets/google_message4/benchmark_message4_1.proto"},
{"benchmarks", "datasets/google_message4/benchmark_message4_2.proto"},
{"benchmarks", "datasets/google_message4/benchmark_message4_3.proto"},
{"src", "google/protobuf/any.proto"},
{"src", "google/protobuf/api.proto"},
{"src", "google/protobuf/compiler/plugin.proto"},
{"src", "google/protobuf/descriptor.proto"},
{"src", "google/protobuf/duration.proto"},
{"src", "google/protobuf/empty.proto"},
{"src", "google/protobuf/field_mask.proto"},
{"src", "google/protobuf/source_context.proto"},
{"src", "google/protobuf/struct.proto"},
{"src", "google/protobuf/test_messages_proto2.proto"},
{"src", "google/protobuf/test_messages_proto3.proto"},
{"src", "google/protobuf/timestamp.proto"},
{"src", "google/protobuf/type.proto"},
{"src", "google/protobuf/wrappers.proto"},
}
for _, f := range files {
protoc("go", "-I"+filepath.Join(protoRoot, f.prefix), "--go_out="+tmpDir, f.path)
}
syncOutput(repoRoot, filepath.Join(tmpDir, modulePath))
}
func protoc(plugins string, args ...string) {
cmd := exec.Command("protoc", "--plugin=protoc-gen-go="+os.Args[0])
cmd.Args = append(cmd.Args, args...)
cmd.Env = append(os.Environ(), "RUN_AS_PROTOC_PLUGIN="+plugins)
out, err := cmd.CombinedOutput()
if err != nil {
fmt.Printf("executing: %v\n%s\n", strings.Join(cmd.Args, " "), out)
}
check(err)
}
// generateFieldNumbers generates an internal package for descriptor.proto
// and well-known types.
func generateFieldNumbers(gen *protogen.Plugin, file *protogen.File) {
if file.Desc.Package() != "google.protobuf" {
return
}
importPath := modulePath + "/internal/fieldnum"
base := strings.TrimSuffix(path.Base(file.Desc.Path()), ".proto")
g := gen.NewGeneratedFile(importPath+"/"+base+"_gen.go", protogen.GoImportPath(importPath))
for _, s := range generatedPreamble {
g.P(s)
}
g.P("package ", path.Base(importPath))
g.P("")
var processMessages func([]*protogen.Message)
processMessages = func(messages []*protogen.Message) {
for _, message := range messages {
g.P("// Field numbers for ", message.Desc.FullName(), ".")
g.P("const (")
for _, field := range message.Fields {
fd := field.Desc
typeName := fd.Kind().String()
switch fd.Kind() {
case protoreflect.EnumKind:
typeName = string(fd.Enum().FullName())
case protoreflect.MessageKind, protoreflect.GroupKind:
typeName = string(fd.Message().FullName())
}
g.P(message.GoIdent.GoName, "_", field.GoName, "=", fd.Number(), "// ", fd.Cardinality(), " ", typeName)
}
g.P(")")
processMessages(message.Messages)
}
}
processMessages(file.Messages)
}
func syncOutput(dstDir, srcDir string) {
filepath.Walk(srcDir, func(srcPath string, _ os.FileInfo, _ error) error {
if !strings.HasSuffix(srcPath, ".go") && !strings.HasSuffix(srcPath, ".meta") {
return nil
}
relPath, err := filepath.Rel(srcDir, srcPath)
check(err)
dstPath := filepath.Join(dstDir, relPath)
if run {
fmt.Println("#", relPath)
b, err := ioutil.ReadFile(srcPath)
check(err)
check(os.MkdirAll(filepath.Dir(dstPath), 0775))
check(ioutil.WriteFile(dstPath, b, 0664))
} else {
cmd := exec.Command("diff", dstPath, srcPath, "-N", "-u")
cmd.Stdout = os.Stdout
cmd.Run()
}
return nil
})
}
func check(err error) {
if err != nil {
panic(err)
}
}