func (r *rocksDBIterator) Seek(key []byte) {
if len(key) == 0 {
// start=Key("") needs special treatment since we need
// to access start[0] in an explicit seek.
r.setState(C.DBIterSeekToFirst(r.iter))
} else {
r.setState(C.DBIterSeek(r.iter, goToCSlice(key)))
}
}
func (r *rocksDBIterator) Seek(key MVCCKey) {
if len(key.Key) == 0 {
// start=Key("") needs special treatment since we need
// to access start[0] in an explicit seek.
r.setState(C.DBIterSeekToFirst(r.iter))
} else {
// We can avoid seeking if we're already at the key we seek.
if r.valid && key.Equal(r.unsafeKey()) {
return
}
r.setState(C.DBIterSeek(r.iter, goToCKey(key)))
}
}
func (r *rocksDBIterator) SeekReverse(key MVCCKey) {
if len(key.Key) == 0 {
r.setState(C.DBIterSeekToLast(r.iter))
} else {
r.setState(C.DBIterSeek(r.iter, goToCKey(key)))
// Maybe the key sorts after the last key in RocksDB.
if !r.Valid() {
r.setState(C.DBIterSeekToLast(r.iter))
}
if !r.Valid() {
return
}
// Make sure the current key is <= the provided key.
if key.Less(r.Key()) {
r.Prev()
}
}
}
func (r *rocksDBIterator) SeekReverse(key []byte) {
if len(key) == 0 {
C.DBIterSeekToLast(r.iter)
} else {
C.DBIterSeek(r.iter, goToCSlice(key))
// Maybe the key has exceeded the last key in rocksdb
if !r.Valid() {
C.DBIterSeekToLast(r.iter)
}
if !r.Valid() {
return
}
// Make sure the current key is <= the provided key.
curKey := r.Key()
if proto.EncodedKey(key).Less(curKey) {
r.Prev()
}
}
}
func (r *rocksDBIterator) SeekReverse(key MVCCKey) {
r.checkEngineOpen()
if len(key.Key) == 0 {
r.setState(C.DBIterSeekToLast(r.iter))
} else {
// We can avoid seeking if we're already at the key we seek.
if r.valid && !r.reseek && key.Equal(r.unsafeKey()) {
return
}
r.setState(C.DBIterSeek(r.iter, goToCKey(key)))
// Maybe the key sorts after the last key in RocksDB.
if !r.Valid() {
r.setState(C.DBIterSeekToLast(r.iter))
}
if !r.Valid() {
return
}
// Make sure the current key is <= the provided key.
if key.Less(r.unsafeKey()) {
r.Prev()
}
}
}