func (t *tOps) createFrom(src iter.Iterator) (f *tFile, n int, err error) {
w, err := t.create()
if err != nil {
return
}
defer func() {
if err != nil {
w.drop()
}
}()
for src.Next() {
err = w.add(src.Key(), src.Value())
if err != nil {
return
}
}
err = src.Error()
if err != nil {
return
}
n = w.tw.Len()
f, err = w.finish()
return
}
// Get lookup for given key on the table. Get returns errors.ErrNotFound if
// given key did not exist.
func (t *Reader) Get(key []byte, ro opt.ReadOptionsGetter) (rkey, rvalue []byte, err error) {
// create an iterator of index block
index_iter := t.index.NewIterator()
if !index_iter.Seek(key) {
err = index_iter.Error()
if err == nil {
err = errors.ErrNotFound
}
return
}
// decode data block info
bi := new(bInfo)
_, err = bi.decodeFrom(index_iter.Value())
if err != nil {
return
}
// get the data block
if t.filter == nil || t.filter.KeyMayMatch(uint(bi.offset), key) {
var it iter.Iterator
var cache cache.Object
it, cache, err = t.getDataIter(bi, ro)
if err != nil {
return
}
if cache != nil {
defer cache.Release()
}
// seek to key
if !it.Seek(key) {
err = it.Error()
if err == nil {
err = errors.ErrNotFound
}
return
}
rkey, rvalue = it.Key(), it.Value()
} else {
err = errors.ErrNotFound
}
return
}