package engine import ( "errors" objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object" "github.com/nspcc-dev/neofs-node/pkg/core/object" "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard" "go.uber.org/zap" ) // GetPrm groups the parameters of Get operation. type GetPrm struct { off, ln uint64 addr *objectSDK.Address } // GetRes groups resulting values of Get operation. type GetRes struct { obj *object.Object } // ErrObjectNotFound is returns on read operations requested on a missing object. var ErrObjectNotFound = errors.New("object not found") // WithAddress is a Get option to set the address of the requested object. // // Option is required. func (p *GetPrm) WithAddress(addr *objectSDK.Address) *GetPrm { if p != nil { p.addr = addr } return p } // WithPayloadRange is a Get option to set range of requested payload data. // // Missing an option or calling with zero length is equivalent // to getting the full payload range. func (p *GetPrm) WithPayloadRange(off, ln uint64) *GetPrm { if p != nil { p.off, p.ln = off, ln } return p } // Object returns the requested object part. // // Instance payload contains the requested range of the original object. func (r *GetRes) Object() *object.Object { return r.obj } // Get reads part of an object from local storage. // // Returns any error encountered that // did not allow to completely read the object part. // // Returns ErrObjectNotFound if requested object is missing in local storage. func (e *StorageEngine) Get(prm *GetPrm) (*GetRes, error) { e.mtx.RLock() defer e.mtx.RUnlock() var obj *object.Object shPrm := new(shard.GetPrm). WithAddress(prm.addr) if prm.ln == 0 { shPrm = shPrm.WithFullRange() } else { shPrm = shPrm.WithRange(prm.off, int64(prm.ln)) } e.iterateOverSortedShards(prm.addr, func(sh *shard.Shard) (stop bool) { res, err := sh.Get(shPrm) if err != nil { if !errors.Is(err, shard.ErrObjectNotFound) { // TODO: smth wrong with shard, need to be processed e.log.Warn("could not get object from shard", zap.Stringer("shard", sh.ID()), zap.String("error", err.Error()), ) } } else { obj = res.Object() } return err == nil }) if obj == nil { return nil, ErrObjectNotFound } return &GetRes{ obj: obj, }, nil }