Golang OrderedKeyValueDB.Get Examples

Example #1

File: sync.go Project: tartavull/dvid

// returned map will only include labels that had previously been seen (has key)
func (d *Data) getCounts(ctx *datastore.VersionedCtx, labels map[indexedLabel]int32) (counts map[indexedLabel]uint32, err error) {
	var store storage.OrderedKeyValueDB
	store, err = d.GetOrderedKeyValueDB()
	if err != nil {
		return
	}

	counts = make(map[indexedLabel]uint32, len(labels))
	var i IndexType
	var label uint64
	var val []byte
	for il := range labels {
		i, label, err = decodeIndexedLabel(il)
		if err != nil {
			return
		}

		val, err = store.Get(ctx, NewTypeLabelTKey(i, label))
		if err != nil {
			return
		}
		if val == nil {
			continue
		}
		if len(val) != 4 {
			err = fmt.Errorf("bad size in value for index type %s, label %d: value has length %d", i, label, len(val))
			return
		}
		counts[il] = binary.LittleEndian.Uint32(val)
	}
	return
}