prometheus/vendor/github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger/main.go

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package main
import (
"flag"
"fmt"
"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/codegenerator"
"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/descriptor"
"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger/genswagger"
)
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")
allowMerge = flag.Bool("allow_merge", false, "if set, generation one swagger file out of multiple protos")
mergeFileName = flag.String("merge_file_name", "apidocs", "target swagger file name prefix after merge")
useJSONNamesForFields = flag.Bool("json_names_for_fields", false, "if it sets Field.GetJsonName() will be used for generating swagger definitions, otherwise Field.GetName() will be used")
repeatedPathParamSeparator = flag.String("repeated_path_param_separator", "csv", "configures how repeated fields should be split. Allowed values are `csv`, `pipes`, `ssv` and `tsv`.")
versionFlag = flag.Bool("version", false, "print the current verison")
allowRepeatedFieldsInBody = flag.Bool("allow_repeated_fields_in_body", false, "allows to use repeated field in `body` and `response_body` field of `google.api.http` annotation option")
includePackageInTags = flag.Bool("include_package_in_tags", false, "if unset, the gRPC service name is added to the `Tags` field of each operation. if set and the `package` directive is shown in the proto file, the package name will be prepended to the service name")
useFQNForSwaggerName = flag.Bool("fqn_for_swagger_name", false, "if set, the object's swagger names will use the fully qualify name from the proto definition (ie my.package.MyMessage.MyInnerMessage")
useGoTemplate = flag.Bool("use_go_templates", false, "if set, you can use Go templates in protofile comments")
)
// Variables set by goreleaser at build time
var (
version = "dev"
commit = "unknown"
date = "unknown"
)
func main() {
flag.Parse()
defer glog.Flush()
if *versionFlag {
fmt.Printf("Version %v, commit %v, built at %v\n", version, commit, date)
os.Exit(0)
}
reg := descriptor.NewRegistry()
glog.V(1).Info("Processing code generator request")
f := os.Stdin
if *file != "-" {
var err error
f, err = os.Open(*file)
if err != nil {
glog.Fatal(err)
}
}
glog.V(1).Info("Parsing code generator request")
req, err := codegenerator.ParseRequest(f)
if err != nil {
glog.Fatal(err)
}
glog.V(1).Info("Parsed code generator request")
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)
}
}
reg.SetPrefix(*importPrefix)
reg.SetAllowDeleteBody(*allowDeleteBody)
reg.SetAllowMerge(*allowMerge)
reg.SetMergeFileName(*mergeFileName)
reg.SetUseJSONNamesForFields(*useJSONNamesForFields)
reg.SetAllowRepeatedFieldsInBody(*allowRepeatedFieldsInBody)
reg.SetIncludePackageInTags(*includePackageInTags)
reg.SetUseFQNForSwaggerName(*useFQNForSwaggerName)
reg.SetUseGoTemplate(*useGoTemplate)
if err := reg.SetRepeatedPathParamSeparator(*repeatedPathParamSeparator); err != nil {
emitError(err)
return
}
for k, v := range pkgMap {
reg.AddPkgMap(k, v)
}
if *grpcAPIConfiguration != "" {
if err := reg.LoadGrpcAPIServiceFromYAML(*grpcAPIConfiguration); err != nil {
emitError(err)
return
}
}
g := genswagger.New(reg)
if err := genswagger.AddStreamError(reg); err != nil {
emitError(err)
return
}
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)
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)
}
}
// 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
}
if spec[0] == "allow_merge" {
err := f.Set(spec[0], "true")
if err != nil {
return fmt.Errorf("Cannot set flag %s: %v", p, err)
}
continue
}
if spec[0] == "allow_repeated_fields_in_body" {
err := f.Set(spec[0], "true")
if err != nil {
return fmt.Errorf("Cannot set flag %s: %v", p, err)
}
continue
}
if spec[0] == "include_package_in_tags" {
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)
}
}
return nil
}