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