package engine import ( "fmt" "github.com/google/uuid" "github.com/nspcc-dev/hrw" "github.com/nspcc-dev/neofs-api-go/pkg/object" "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard" "github.com/pkg/errors" ) var errShardNotFound = errors.New("shard not found") type hashedShard struct { sh *shard.Shard } // AddShard adds a new shard to the storage engine. // // Returns any error encountered that did not allow adding a shard. // Otherwise returns the ID of the added shard. func (e *StorageEngine) AddShard(opts ...shard.Option) (*shard.ID, error) { e.mtx.Lock() defer e.mtx.Unlock() id, err := e.generateShardID() if err != nil { return nil, errors.Wrap(err, "could not generate shard ID") } e.shards[id.String()] = shard.New(append(opts, shard.WithID(id))...) return id, nil } func (e *StorageEngine) generateShardID() (*shard.ID, error) { uid, err := uuid.NewRandom() if err != nil { return nil, err } bin, err := uid.MarshalBinary() if err != nil { return nil, err } return shard.NewIDFromBytes(bin), nil } func (e *StorageEngine) shardWeight(sh *shard.Shard) float64 { weightValues := sh.WeightValues() return float64(weightValues.FreeSpace) } func (e *StorageEngine) sortShardsByWeight(objAddr fmt.Stringer) []hashedShard { e.mtx.RLock() defer e.mtx.RUnlock() shards := make([]hashedShard, 0, len(e.shards)) weights := make([]float64, 0, len(e.shards)) for _, sh := range e.shards { shards = append(shards, hashedShard{sh}) weights = append(weights, e.shardWeight(sh)) } hrw.SortSliceByWeightValue(shards, weights, hrw.Hash([]byte(objAddr.String()))) return shards } func (e *StorageEngine) iterateOverSortedShards(addr *object.Address, handler func(*shard.Shard) (stop bool)) { for _, sh := range e.sortShardsByWeight(addr) { if handler(sh.sh) { break } } } // SetShardMode sets mode of the shard with provided identifier. // // Returns an error if shard mode was not set, or shard was not found in storage engine. func (e *StorageEngine) SetShardMode(id *shard.ID, m shard.Mode) error { e.mtx.RLock() defer e.mtx.RUnlock() for shID, sh := range e.shards { if id.String() == shID { return sh.SetMode(m) } } return errShardNotFound } func (s hashedShard) Hash() uint64 { return hrw.Hash( []byte(s.sh.ID().String()), ) }