Пример #1
0
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
}
Пример #2
0
// 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
}