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main.go
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main.go
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package main
import (
"flag"
"io"
"log"
"os"
"github.com/golang/protobuf/proto"
plugin "github.com/golang/protobuf/protoc-gen-go/plugin"
"github.com/grpc-ecosystem/grpc-gateway/codegenerator"
"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/descriptor"
"github.com/s7techlab/cckit/gateway/protoc-gen-cc-gateway/generator"
)
var (
file = flag.String("file", "-", "where to load data from")
)
func main() {
var err error
flag.Parse()
if err = flag.Lookup("logtostderr").Value.Set("true"); err != nil {
log.Fatal(err)
}
reg := descriptor.NewRegistry()
fs := os.Stdin
if *file != "-" {
if fs, err = os.Open(*file); err != nil {
log.Fatal(err)
}
}
req, err := codegenerator.ParseRequest(fs)
if err != nil {
log.Fatal(err)
}
if err = reg.Load(req); err != nil {
emitError(err)
return
}
g := generator.New(reg)
var (
targets []*descriptor.File
f *descriptor.File
)
for _, target := range req.FileToGenerate {
if f, err = reg.LookupFile(target); err != nil {
log.Fatal(err)
}
targets = append(targets, f)
}
out, err := g.Generate(targets)
if err != nil {
emitError(err)
return
}
emitFiles(os.Stdout, out)
}
func emitFiles(w io.Writer, out []*plugin.CodeGeneratorResponse_File) {
emitResp(w, &plugin.CodeGeneratorResponse{File: out})
}
func emitError(err error) {
emitResp(os.Stdout, &plugin.CodeGeneratorResponse{Error: proto.String(err.Error())})
}
func emitResp(out io.Writer, resp *plugin.CodeGeneratorResponse) {
buf, err := proto.Marshal(resp)
if err != nil {
log.Fatal(err)
}
if _, err := out.Write(buf); err != nil {
log.Fatal(err)
}
}