func (r *Reader) NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator {
if r.err != nil {
return iterator.NewEmptyIterator(r.err)
}
index := &indexIter{
blockIter: *r.indexBlock.newIterator(slice, true, nil),
tableReader: r,
slice: slice,
checksum: ro.GetStrict(opt.StrictBlockChecksum),
fillCache: !ro.GetDontFillCache(),
}
return iterator.NewIndexedIterator(index, r.strictIter || ro.GetStrict(opt.StrictIterator), false)
}
// Find finds key/value pair whose key is greater than or equal to the
// given key. It returns ErrNotFound if the table doesn't contain
// such pair.
//
// The caller should not modify the contents of the returned slice, but
// it is safe to modify the contents of the argument after Find returns.
func (r *Reader) Find(key []byte, ro *opt.ReadOptions) (rkey, value []byte, err error) {
if r.err != nil {
err = r.err
return
}
index := r.indexBlock.newIterator(nil, true, nil)
defer index.Release()
if !index.Seek(key) {
err = index.Error()
if err == nil {
err = ErrNotFound
}
return
}
dataBH, n := decodeBlockHandle(index.Value())
if n == 0 {
err = errors.New("leveldb/table: Reader: invalid table (bad data block handle)")
return
}
if r.filterBlock != nil && !r.filterBlock.contains(dataBH.offset, key) {
err = ErrNotFound
return
}
data := r.getDataIter(dataBH, nil, ro.GetStrict(opt.StrictBlockChecksum), !ro.GetDontFillCache())
defer data.Release()
if !data.Seek(key) {
err = data.Error()
if err == nil {
err = ErrNotFound
}
return
}
// Don't use block buffer, no need to copy the buffer.
rkey = data.Key()
// Use block buffer, and since the buffer will be recycled, the buffer
// need to be copied.
value = append([]byte{}, data.Value()...)
return
}
