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main.go
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main.go
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package main
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"text/template"
"github.com/golang/protobuf/proto"
"github.com/golang/protobuf/protoc-gen-go/descriptor"
plugin "github.com/golang/protobuf/protoc-gen-go/plugin"
)
const Version = "v1"
func main() {
if err := run(); err != nil {
log.Fatal(err)
}
}
func run() error {
data, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return err
}
req := new(plugin.CodeGeneratorRequest)
if err := proto.Unmarshal(data, req); err != nil {
return err
}
if len(req.FileToGenerate) == 0 {
log.Fatal("no files to generate")
}
resp := new(plugin.CodeGeneratorResponse)
for _, name := range req.FileToGenerate {
file, err := getFileDescriptor(req, name)
if err != nil {
return err
}
genFile, err := generateFile(file)
if err != nil {
return fmt.Errorf("generating %s: %s", name, err)
}
if len(file.GetService()) > 0 {
resp.File = append(resp.File, genFile)
}
}
data, err = proto.Marshal(resp)
if err != nil {
return err
}
if _, err := os.Stdout.Write(data); err != nil {
return err
}
return nil
}
func generateFile(file *descriptor.FileDescriptorProto) (*plugin.CodeGeneratorResponse_File, error) {
tmpl, err := template.New("file").Parse(browserTemplate)
if err != nil {
return nil, err
}
data := &templateData{
Version: Version,
SourceFilename: file.GetName(),
}
for _, service := range file.GetService() {
data.Services = append(data.Services, &Service{service})
}
var buf bytes.Buffer
if err = tmpl.Execute(&buf, data); err != nil {
return nil, fmt.Errorf("rendering template for %s: %s", file.GetName(), err)
}
name := file.GetName()
name = name[:len(name)-len(filepath.Ext(name))]
return &plugin.CodeGeneratorResponse_File{
Name: proto.String(fmt.Sprintf("%s.js", name)),
Content: proto.String(buf.String()),
}, nil
}
func getFileDescriptor(req *plugin.CodeGeneratorRequest, name string) (*descriptor.FileDescriptorProto, error) {
for _, descriptor := range req.ProtoFile {
if descriptor.GetName() == name {
return descriptor, nil
}
}
return nil, fmt.Errorf("could not find descriptor for %s", name)
}