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note_iter.go
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/
note_iter.go
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package note
import (
"log"
"github.com/boltdb/bolt"
)
/*
* @CreateTime: 2021/1/12 20:49
* @Author: JemmyHu <hujm20151021@gmail.com>
* @Description: a iterator for note
*/
type NoteIter struct {
CurKey []byte
Db *bolt.DB
PubKey []byte
PrvKey []byte
Passwd string
}
func NewNoteIter(curKey string, db *bolt.DB, userName, pwd string) *NoteIter {
return &NoteIter{
CurKey: []byte(curKey),
Db: db,
PubKey: GetPubKey(userName),
PrvKey: GetPrvKey(userName),
Passwd: pwd,
}
}
func (i *NoteIter) Next() *Note {
var note *Note
err := i.Db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(GetDbBucketName()))
if b == nil {
return nil
}
noteBytes := b.Get(i.CurKey)
if noteBytes == nil {
return nil
}
note = DeserializeNote(noteBytes, i.PrvKey, i.Passwd)
return nil
})
if err != nil {
log.Panic(err)
}
if note != nil {
i.CurKey = note.NextID
}
return note
}
func (i *NoteIter) Prev() *Note {
var note *Note
err := i.Db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(GetDbBucketName()))
if b == nil {
return nil
}
noteBytes := b.Get(i.CurKey)
if noteBytes == nil {
return nil
}
note = DeserializeNote(noteBytes, i.PrvKey, i.Passwd)
return nil
})
if err != nil {
log.Panic(err)
}
if note != nil {
i.CurKey = note.PrevID
}
return note
}