forked from 3bl3gamer/tgclient
/
session_store.go
85 lines (71 loc) · 1.85 KB
/
session_store.go
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package mtproto
import (
"encoding/json"
"errors"
"io/fs"
"os"
"github.com/ansel1/merry/v2"
)
var ErrNoSessionData = merry.Sentinel("no session data")
type SessionStore interface {
Save(*SessionInfo) error
Load(*SessionInfo) error
}
type SessNoopStore struct{}
func (s *SessNoopStore) Save(sess *SessionInfo) error { return nil }
func (s *SessNoopStore) Load(sess *SessionInfo) error { return merry.Wrap(ErrNoSessionData) }
type SessFileStore struct {
FPath string
}
func (s *SessFileStore) Save(sess *SessionInfo) (err error) {
f, err := os.Create(s.FPath + ".temp")
if err != nil {
return merry.Wrap(err)
}
defer f.Close()
encoder := json.NewEncoder(f)
encoder.SetIndent("", "\t")
if err := encoder.Encode(sess); err != nil {
return merry.Wrap(err)
}
if err := f.Close(); err != nil {
return merry.Wrap(err)
}
if err := os.Rename(s.FPath+".temp", s.FPath); err != nil {
return merry.Wrap(err)
}
return nil
}
func (s *SessFileStore) Load(sess *SessionInfo) error {
f, err := os.Open(s.FPath)
if errors.Is(err, fs.ErrNotExist) {
return merry.Wrap(ErrNoSessionData, merry.WithCause(err))
}
if err != nil {
return merry.Wrap(err)
}
defer f.Close()
if err := json.NewDecoder(f).Decode(sess); err != nil {
return merry.Wrap(err)
}
return nil
}
type SessFileStoreExt struct {
SessFileStore
RequirePresent bool // Session file must be already present
IgnoreUnreadable bool // Session file can be unreadable and will be overwritten, if unreadable and writeable
}
func (s *SessFileStoreExt) Load(sess *SessionInfo) error {
err := s.SessFileStore.Load(sess)
if s.RequirePresent && errors.Is(err, ErrNoSessionData) {
causeErr := merry.Cause(err)
if causeErr != nil {
return merry.Wrap(causeErr)
}
return merry.Wrap(err)
}
if s.IgnoreUnreadable && err != nil {
return merry.Wrap(ErrNoSessionData)
}
return merry.Wrap(err)
}