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main.go
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main.go
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package main
import (
"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/utrack/clay/v2/cmd/protoc-gen-goclay/genhandler"
)
var (
importPrefix = flag.String("import_prefix", "", "prefix to be added to go package paths for imported proto files")
file = flag.String("file", "-", "where to load data from")
allowDeleteBody = flag.Bool("allow_delete_body", false, "unless set, HTTP DELETE methods may not have a body")
grpcAPIConfiguration = flag.String("grpc_api_configuration", "", "path to gRPC API Configuration in YAML format")
withImpl = flag.Bool("impl", false, "generate simple implementations for proto Services. Implementation will not be generated if it already exists. See also `force` option")
withSwagger = flag.Bool("swagger", true, "generate swagger.json")
withSwaggerPath = flag.String("swagger_path", "", "in addition to swagger in pb.goclay.go, generate separate swagger file at provided path")
applyHTTPMiddlewares = flag.Bool("http_middlewares", true, "apply default HTTP millewares")
implPath = flag.String("impl_path", "", "path where the implementation is generated (for impl = true)")
forceImpl = flag.Bool("force", false, "force regenerate implementation if it already exists (for impl = true)")
serviceSubDir = flag.Bool("impl_service_sub_dir", false, "generate implementation for each service into sub directory")
implTypeNameTmpl = flag.String("impl_type_name_tmpl", "{{ .ServiceName}}Implementation", "template for generating name of implementation structure")
implFileNameTmpl = flag.String("impl_file_name_tmpl", "{{ if .MethodName }}{{ .MethodName }}{{ else }}{{ .ServiceName }}{{ end }}", "template for generating implementations filename")
withTests = flag.Bool("tests", true, "generate simple unit tests for proto Services")
)
func main() {
flag.Parse()
flag.Lookup("logtostderr").Value.Set("true")
defer glog.Flush()
reg := descriptor.NewRegistry()
glog.V(2).Info("Processing code generator request")
fs := os.Stdin
if *file != "-" {
var err error
fs, err = os.Open(*file)
if err != nil {
glog.Fatal(err)
}
}
glog.V(2).Info("Parsing code generator request")
req, err := parseRequest(fs)
if err != nil {
glog.Fatal(err)
}
pkgMap := make(map[string]string)
if req.Parameter != nil {
err = parseReqParam(req.GetParameter(), flag.CommandLine, pkgMap)
if err != nil {
glog.Fatalf("Error parsing flags: %v", err)
}
}
// Remove this type cast when grpc-gateway will release new version.
// For now this functions only present in master branch
var xreg interface{} = reg
if set, ok := xreg.(interface{ SetAllowRepeatedFieldsInBody(bool) }); ok {
set.SetAllowRepeatedFieldsInBody(true)
}
// Use Field.GetJsonName() for generating swagger definitions
if set, ok := xreg.(interface{ SetUseJSONNamesForFields(bool) }); ok {
set.SetUseJSONNamesForFields(true)
}
reg.SetAllowDeleteBody(*allowDeleteBody)
reg.SetPrefix(*importPrefix)
reg.SetDisableDefaultErrors(true)
for k, v := range pkgMap {
reg.AddPkgMap(k, v)
}
if *grpcAPIConfiguration != "" {
if err = reg.LoadGrpcAPIServiceFromYAML(*grpcAPIConfiguration); err != nil {
emitError(err)
return
}
}
if err = reg.Load(req); err != nil {
emitError(err)
return
}
genhandler.MustRegisterImplTypeNameTemplate(*implTypeNameTmpl)
genhandler.MustRegisterImplFileNameTemplate(*implFileNameTmpl)
opts := []genhandler.Option{
genhandler.Impl(*withImpl),
genhandler.ImplPath(*implPath),
genhandler.Force(*forceImpl),
genhandler.ServiceSubDir(*serviceSubDir),
genhandler.ApplyDefaultMiddlewares(*applyHTTPMiddlewares),
genhandler.WithTests(*withTests),
}
if *withSwagger {
swagBuf, err := genSwaggerDef(reg, req)
if err != nil {
emitError(err)
return
}
opts = append(opts, genhandler.SwaggerDef(swagBuf))
}
if *withSwaggerPath != "" {
opts = append(opts, genhandler.SwaggerPath(*withSwaggerPath))
}
g := genhandler.New(reg, opts...)
var targets []*descriptor.File
for _, target := range req.FileToGenerate {
var f *descriptor.File
f, err = reg.LookupFile(target)
if err != nil {
glog.Fatal(err)
}
targets = append(targets, f)
}
out, err := g.Generate(targets)
glog.V(2).Info("Processed code generator request")
if err != nil {
emitError(err)
return
}
emitFiles(os.Stdout, out)
}
// parseReqParam parses a CodeGeneratorRequest parameter and adds the
// extracted values to the given FlagSet and pkgMap. Returns a non-nil
// error if setting a flag failed.
func parseReqParam(param string, f *flag.FlagSet, pkgMap map[string]string) error {
if param == "" {
return nil
}
for _, p := range strings.Split(param, ",") {
spec := strings.SplitN(p, "=", 2)
if len(spec) == 1 {
if spec[0] == "allow_delete_body" {
err := f.Set(spec[0], "true")
if err != nil {
return fmt.Errorf("Cannot set flag %s: %v", p, err)
}
continue
}
err := f.Set(spec[0], "")
if err != nil {
return fmt.Errorf("Cannot set flag %s: %v", p, err)
}
continue
}
name, value := spec[0], spec[1]
if strings.HasPrefix(name, "M") {
pkgMap[name[1:]] = value
continue
}
if err := f.Set(name, value); err != nil {
return fmt.Errorf("Cannot set flag %s: %v", p, err)
}
}
*implPath = strings.Trim(*implPath, "/")
if *implPath == "." {
*implPath = ""
}
return nil
}
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 {
glog.Fatal(err)
}
if _, err := out.Write(buf); err != nil {
glog.Fatal(err)
}
}
// extracted from grpc-gateway pre-1.13.0
func parseRequest(r io.Reader) (*plugin.CodeGeneratorRequest, error) {
input, err := ioutil.ReadAll(r)
if err != nil {
return nil, fmt.Errorf("failed to read code generator request: %v", err)
}
req := new(plugin.CodeGeneratorRequest)
if err = proto.Unmarshal(input, req); err != nil {
return nil, fmt.Errorf("failed to unmarshal code generator request: %v", err)
}
return req, nil
}