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package config
// functions to import and export the protobuf
// data to and from config files
import (
"errors"
"os"
"path/filepath"
"strings"
"go.wit.com/log"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/encoding/prototext"
"google.golang.org/protobuf/proto"
)
/*
// loads a file from ~/.config/<argname>/
func Load(argname string) ([]byte, string) {
}
*/
var ErrEmpty error = log.Errorf("file was empty")
// returns:
// - Full path to the config file. usually: ~/.config/<argname>
// - []byte : the contents of the file
// - error on read
func ConfigLoad(pb proto.Message, argname string, protoname string) error {
var fullname string
homeDir, err := os.UserHomeDir()
if err != nil {
log.Warn("ConfigLoad() UserHomeDir() err", err)
return err
}
fullname = filepath.Join(homeDir, ".config", argname, protoname+".text")
if err := loadTEXT(pb, fullname); err == nil {
return nil
}
if strings.HasSuffix(fullname, ".text") {
fullname = strings.TrimSuffix(fullname, ".text")
fullname += ".json"
if err := loadJSON(pb, fullname); err != nil {
return err
}
return nil
}
log.Info("Config file load failed:", fullname)
return log.Errorf("could not load config file")
}
func loadTEXT(pb proto.Message, fullname string) error {
var data []byte
var err error
if data, err = loadFile(fullname); err != nil {
log.Warn("config file failed to load", err)
// set pb.Filename that was attempted
SetFilename(pb, fullname)
return err
}
// don't even bother with Marshal()
if data == nil {
log.Warn("ConfigLoad() config file was empty", fullname)
return ErrEmpty // file is empty
}
// Unmarshal()
if err = prototext.Unmarshal(data, pb); err != nil {
log.Warn("ConfigLoad() file", fullname)
log.Warn("ConfigLoad() Unmarshal() err", err)
return err
}
if fn, ok := GetFilename(pb); ok {
if fn != fullname {
log.Info("config.ConfigLoad() new filename:", fullname)
SetFilename(pb, fullname)
}
}
if os.Getenv("CONFIG_VERBOSE") == "true" {
log.Infof("ConfigLoad() %s len()=%d\n", fullname, len(data))
}
return nil
}
func loadJSON(pb proto.Message, fullname string) error {
var data []byte
var err error
if data, err = loadFile(fullname); err != nil {
log.Warn("config file failed to load", err)
// set pb.Filename that was attempted
SetFilename(pb, fullname)
return err
}
// don't even bother with Marshal()
if data == nil {
log.Warn("ConfigLoad() config file was empty", fullname)
return ErrEmpty // file is empty
}
// Unmarshal()
if err = protojson.Unmarshal(data, pb); err != nil {
log.Warn("ConfigLoad() file", fullname)
log.Warn("ConfigLoad() Unmarshal() err", err)
return err
}
if fn, ok := GetFilename(pb); ok {
if fn != fullname {
log.Info("config.ConfigLoad() new filename:", fullname)
SetFilename(pb, fullname)
}
}
if os.Getenv("CONFIG_VERBOSE") == "true" {
log.Infof("ConfigLoad() %s len()=%d\n", fullname, len(data))
}
return nil
}
func loadFile(fullname string) ([]byte, error) {
data, err := os.ReadFile(fullname)
if errors.Is(err, os.ErrNotExist) {
// if file does not exist, just return nil. this
return nil, err
}
if err != nil {
// log.Info("open config file :", err)
return nil, err
}
return data, nil
}
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