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package config
import (
"fmt"
"os"
"path/filepath"
"strings"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/encoding/prototext"
"google.golang.org/protobuf/proto"
)
var ErrProtoFilename error = fmt.Errorf("proto does not have Filename")
func SavePB(pb proto.Message) error {
return Save(pb)
}
// writes the protobuf to disk
// uses the already configured Filename
func Save(pb proto.Message) error {
fullname, err := GetFilename(pb)
if err != nil {
return err
}
return SaveToFilename(pb, fullname)
}
// special case. adds a header to the TEXT output
func SaveWithHeader(pb proto.Message, header string) error {
err := saveTEXT(pb, header)
return err
}
// writes the protobuf to disk (sets Filename if PB has 'Filename')
func SaveToFilename(pb proto.Message, fullname string) error {
basedir, _ := filepath.Split(fullname)
if err := os.MkdirAll(basedir, os.ModePerm); err != nil {
return err
}
if strings.HasSuffix(fullname, ".pb") {
return saveProto(pb, fullname)
}
if strings.HasSuffix(fullname, ".text") {
return saveTEXT(pb, "")
}
if strings.HasSuffix(fullname, ".json") {
return saveJSON(pb)
}
return fmt.Errorf("unknown filetype '%s'", fullname)
}
func saveProto(pb proto.Message, fullname string) error {
if !strings.HasSuffix(fullname, ".pb") {
// todo: append .text here?
return fmt.Errorf("%s needs to end in '.pb'", fullname)
}
dir, name := filepath.Split(fullname)
if name == "" {
return fmt.Errorf("filename was blank")
}
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
return err
}
data, err := proto.Marshal(pb)
if err != nil {
return err
}
return configWrite(fullname, data)
}
func saveTEXT(pb proto.Message, header string) error {
// get pb.Filename if it is there in the .proto file
fullname, err := GetFilename(pb)
if err != nil {
return err
}
fullname = strings.TrimSpace(fullname)
if fullname == "" {
return fmt.Errorf("saveTEXT() pb.Filename was blank")
}
if !strings.HasSuffix(fullname, ".text") {
// todo: append .text here?
return fmt.Errorf("not .text file: %s", fullname)
}
dir, name := filepath.Split(fullname)
if name == "" {
return fmt.Errorf("filename was blank")
}
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
return err
}
data := prototext.Format(pb)
err = configWrite(fullname, []byte(data))
if err != nil {
return err
}
return nil
}
func saveJSON(pb proto.Message) error {
// get pb.Filename if it is there in the .proto file
fullname, err := GetFilename(pb)
if err != nil {
return err
}
if !strings.HasSuffix(fullname, ".text") {
// todo: append .text here?
return fmt.Errorf("not .text file: %s", fullname)
}
dir, name := filepath.Split(fullname)
if name == "" {
return fmt.Errorf("filename was blank")
}
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
return err
}
data := protojson.Format(pb)
fullname += ".json"
err = configWrite(fullname, []byte(data))
if err != nil {
return err
}
return nil
}
func configWrite(fullname string, data []byte) error {
cfgfile, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
defer cfgfile.Close()
if err != nil {
return err
}
_, err = cfgfile.Write(data)
return err
}
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