/
main.go
106 lines (85 loc) · 2.05 KB
/
main.go
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package main
import (
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"github.com/pkg/errors"
"github.com/twirphp/twirp/protoc-gen-twirp_php/internal/gen"
"google.golang.org/protobuf/compiler/protogen"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/descriptorpb"
"google.golang.org/protobuf/types/pluginpb"
)
// Provisioned by ldflags
var (
version string
)
func main() {
versionFlag := flag.Bool("version", false, "print version and exit")
flag.Parse()
if *versionFlag {
fmt.Println(version)
os.Exit(0)
}
err := Main(os.Stdin, os.Stdout)
if err != nil {
log.Fatal(err)
}
}
// Main does the hard work. It is called by the main func.
func Main(in io.Reader, out io.Writer) error {
req, err := readCodeGeneratorRequest(in)
if err != nil {
return err
}
// This is an ugly hack to make sure we bypass Go requirements
for _, fd := range req.GetProtoFile() {
pkg := "dummy/path"
if fd.Options == nil {
fd.Options = &descriptorpb.FileOptions{}
}
fd.Options.GoPackage = &pkg
}
options := protogen.Options{}
plugin, err := options.New(req)
if err != nil {
return err
}
err = gen.Generate(plugin, version)
if err != nil {
plugin.Error(err)
}
err = writeCodeGeneratorResponse(out, plugin.Response())
if err != nil {
return err
}
return nil
}
func readCodeGeneratorRequest(in io.Reader) (*pluginpb.CodeGeneratorRequest, error) {
data, err := ioutil.ReadAll(in)
if err != nil {
return nil, errors.Wrap(err, "cannot read input")
}
req := new(pluginpb.CodeGeneratorRequest)
if err = proto.Unmarshal(data, req); err != nil {
return nil, errors.Wrap(err, "cannot parse input proto")
}
if len(req.FileToGenerate) == 0 {
return nil, errors.Wrap(err, "no files to generate")
}
return req, nil
}
func writeCodeGeneratorResponse(out io.Writer, resp *pluginpb.CodeGeneratorResponse) error {
data, err := proto.Marshal(resp)
if err != nil {
return errors.Wrap(err, "cannot serialize output proto")
}
_, err = out.Write(data)
if err != nil {
return errors.Wrap(err, "cannot write output")
}
return nil
}