/
main.go
134 lines (119 loc) · 3.73 KB
/
main.go
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package main
import (
"crypto/sha1"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"github.com/golang/glog"
"github.com/golang/protobuf/proto"
plugin "github.com/golang/protobuf/protoc-gen-go/plugin"
"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/descriptor"
"github.com/tmc/grpcutil/protoc-gen-flowtypes/genflowtypes"
)
var (
importPrefix = flag.String("import_prefix", "", "prefix to be added to go package paths for imported proto files")
flagAlwaysQualifyTypes = flag.Bool("always_qualify_type_names", false, "prefixes package names to all types if true")
flagEmbedEnums = flag.Bool("embed_enums", false, "embeds instead of creating references to enum types")
flagFilenameOverride = flag.String("output", "", "output filename override")
flagOptionalSimpleTypes = flag.Bool("optional_simples", false, "marks default optionality for 'simple' field values")
flagEmitEnumZeros = flag.Bool("enum_zeros", false, "emit enum names of value zero")
flagDumpJSON = flag.Bool("dump_json", false, "dump json representation of request to stderr")
file = flag.String("file", "stdin", "where to load data from")
)
func parseReq(r io.Reader) (*plugin.CodeGeneratorRequest, string, error) {
glog.V(1).Info("Parsing code generator request")
input, err := ioutil.ReadAll(r)
if err != nil {
glog.Errorf("Failed to read code generator request: %v", err)
return nil, "", err
}
req := new(plugin.CodeGeneratorRequest)
if err = proto.Unmarshal(input, req); err != nil {
glog.Errorf("Failed to unmarshal code generator request: %v", err)
return nil, "", err
}
glog.V(1).Info("Parsed code generator request")
shasum := fmt.Sprintf("%x", sha1.Sum(input))
glog.V(1).Info("input sha sum:", shasum)
return req, shasum, nil
}
func main() {
flag.Parse()
defer glog.Flush()
reg := descriptor.NewRegistry()
glog.V(1).Info("Processing code generator request")
f := os.Stdin
if *file != "stdin" {
f, _ = os.Open("input.txt")
}
req, inputSha, err := parseReq(f)
if err != nil {
glog.Fatal(err)
}
if req.Parameter != nil {
for _, p := range strings.Split(req.GetParameter(), ",") {
spec := strings.SplitN(p, "=", 2)
if len(spec) == 1 {
if err := flag.CommandLine.Set(spec[0], ""); err != nil {
glog.Fatalf("Cannot set flag %s", p)
}
continue
}
name, value := spec[0], spec[1]
if strings.HasPrefix(name, "M") {
reg.AddPkgMap(name[1:], value)
continue
}
if err := flag.CommandLine.Set(name, value); err != nil {
glog.Fatalf("Cannot set flag %s", p)
}
}
}
g := genflowtypes.New(reg)
reg.SetPrefix(*importPrefix)
if err := reg.Load(req); err != nil {
emitError(err)
return
}
var targets []*descriptor.File
for _, target := range req.FileToGenerate {
f, err := reg.LookupFile(target)
if err != nil {
glog.Fatal(err)
}
targets = append(targets, f)
}
out, err := g.Generate(targets, genflowtypes.GeneratorOptions{
AlwaysQualifyTypes: *flagAlwaysQualifyTypes,
EmbedEnums: *flagEmbedEnums,
OptonalSimpleTypes: *flagOptionalSimpleTypes,
FilenameOverride: *flagFilenameOverride,
EmitEnumZeros: *flagEmitEnumZeros,
DumpJSON: *flagDumpJSON,
InputID: inputSha,
})
glog.V(1).Info("Processed code generator request")
if err != nil {
emitError(err)
return
}
emitFiles(out)
}
func emitFiles(out []*plugin.CodeGeneratorResponse_File) {
emitResp(&plugin.CodeGeneratorResponse{File: out})
}
func emitError(err error) {
emitResp(&plugin.CodeGeneratorResponse{Error: proto.String(err.Error())})
}
func emitResp(resp *plugin.CodeGeneratorResponse) {
buf, err := proto.Marshal(resp)
if err != nil {
glog.Fatal(err)
}
if _, err := os.Stdout.Write(buf); err != nil {
glog.Fatal(err)
}
}