// Get get value for given key of the latest snapshot of database.
func (d *DB) Get(key []byte, ro *opt.ReadOptions) (value []byte, err error) {
err = d.rok()
if err != nil {
return
}
value, err = d.get(key, d.getSeq(), ro)
if ro.HasFlag(opt.RFDontCopyBuffer) {
return
}
return dupBytes(value), err
}
// NewIterator return an iterator over the contents of this snapshot of
// database.
//
// Please note that the iterator is not thread-safe, you may not use same
// iterator instance concurrently without external synchronization.
func (p *Snapshot) NewIterator(ro *opt.ReadOptions) iterator.Iterator {
if atomic.LoadUint32(&p.released) != 0 {
return &iterator.EmptyIterator{errors.ErrSnapshotReleased}
}
d := p.d
if err := d.rok(); err != nil {
return &iterator.EmptyIterator{err}
}
return &dbIter{
snap: p,
cmp: d.s.cmp.cmp,
it: d.newRawIterator(ro),
seq: p.entry.seq,
copyBuffer: !ro.HasFlag(opt.RFDontCopyBuffer),
}
}
