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107 lines
2.3 KiB
Go
107 lines
2.3 KiB
Go
package protocbase
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import (
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"bytes"
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"fmt"
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"text/template"
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"time"
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"github.com/Masterminds/sprig"
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"github.com/golang/protobuf/proto"
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"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/descriptor"
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"golang.org/x/tools/imports"
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)
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var extensions = map[string]*proto.ExtensionDesc{}
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type BaseTemplateData struct {
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Now time.Time
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File *descriptor.File
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registry *descriptor.Registry
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}
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var templateFuncs = map[string]interface{}{
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"option": getOption,
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}
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func RegisterTmplFunc(name string, f interface{}) {
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if _, existing := templateFuncs[name]; existing {
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panic(fmt.Sprintf("func with name %v is already registered", name))
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}
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templateFuncs[name] = f
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}
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func RegisterExtension(ext *proto.ExtensionDesc) {
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extensions[ext.Name] = ext
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}
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func GetBaseTemplateData(registry *descriptor.Registry, file *descriptor.File) *BaseTemplateData {
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return &BaseTemplateData{
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Now: time.Now().UTC(),
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File: file,
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registry: registry,
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}
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}
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func getOption(opts proto.Message, extName string) interface{} {
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extDesc := extensions[extName]
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if !proto.HasExtension(opts, extDesc) {
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return nil
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}
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ext, err := proto.GetExtension(opts, extDesc)
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if err != nil {
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panic(err)
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}
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return ext
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}
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func (data *BaseTemplateData) ResolveMsgType(msgType string) string {
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msg, err := data.registry.LookupMsg(data.File.GetPackage(), msgType)
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if err != nil {
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panic(err)
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}
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return msg.GoType(data.File.GoPkg.Path)
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}
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func (data *BaseTemplateData) ResolveFile(fileName string) *descriptor.File {
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file, err := data.registry.LookupFile(fileName)
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if err != nil {
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panic(err)
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}
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return file
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}
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func LoadTemplate(templateData []byte, err error) *template.Template {
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if err != nil {
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panic(err)
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}
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return template.Must(template.New("").
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Funcs(sprig.TxtFuncMap()).
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Funcs(templateFuncs).
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Parse(string(templateData)))
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}
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func GenerateFromTemplate(tmpl *template.Template, data interface{}) (string, error) {
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var tpl bytes.Buffer
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err := tmpl.Execute(&tpl, data)
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if err != nil {
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return "", err
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}
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tmplResult := tpl.Bytes()
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tmplResult, err = imports.Process(".", tmplResult, nil)
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return string(tmplResult), err
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}
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func GenerateFromBaseTemplate(tmpl *template.Template, registry *descriptor.Registry, file *descriptor.File) (string, error) {
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return GenerateFromTemplate(tmpl, GetBaseTemplateData(registry, file))
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}
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