package shard import ( "fmt" 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/blobovnicza" "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor" meta "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/metabase" ) // storFetcher is a type to unify object fetching mechanism in `fetchObjectData` // method. It represents generalization of `getSmall` and `getBig` methods. type storFetcher = func(stor *blobstor.BlobStor, id *blobovnicza.ID) (*object.Object, error) // GetPrm groups the parameters of Get operation. type GetPrm struct { addr *objectSDK.Address } // GetRes groups resulting values of Get operation. type GetRes struct { obj *object.Object } // 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 } // Object returns the requested object. func (r *GetRes) Object() *object.Object { return r.obj } // Get reads an object from shard. // // Returns any error encountered that // did not allow to completely read the object part. // // Returns object.ErrNotFound if requested object is missing in shard. func (s *Shard) Get(prm *GetPrm) (*GetRes, error) { var big, small storFetcher big = func(stor *blobstor.BlobStor, _ *blobovnicza.ID) (*object.Object, error) { getBigPrm := new(blobstor.GetBigPrm) getBigPrm.SetAddress(prm.addr) res, err := stor.GetBig(getBigPrm) if err != nil { return nil, err } return res.Object(), nil } small = func(stor *blobstor.BlobStor, id *blobovnicza.ID) (*object.Object, error) { getSmallPrm := new(blobstor.GetSmallPrm) getSmallPrm.SetAddress(prm.addr) getSmallPrm.SetBlobovniczaID(id) res, err := stor.GetSmall(getSmallPrm) if err != nil { return nil, err } return res.Object(), nil } obj, err := s.fetchObjectData(prm.addr, big, small) return &GetRes{ obj: obj, }, err } // fetchObjectData looks through writeCache and blobStor to find object. func (s *Shard) fetchObjectData(addr *objectSDK.Address, big, small storFetcher) (*object.Object, error) { var ( err error res *object.Object ) if s.hasWriteCache() { res, err = small(s.writeCache, nil) if err == nil { return res, nil } s.log.Debug("miss in writeCache blobovnicza") res, err = big(s.writeCache, nil) if err == nil { return res, nil } s.log.Debug("miss in writeCache shallow dir") } exists, err := meta.Exists(s.metaBase, addr) if err != nil { return nil, err } if !exists { return nil, object.ErrNotFound } blobovniczaID, err := meta.IsSmall(s.metaBase, addr) if err != nil { return nil, fmt.Errorf("can't fetch blobovnicza id from metabase: %w", err) } if blobovniczaID != nil { res, err = small(s.blobStor, blobovniczaID) } else { res, err = big(s.blobStor, nil) } return res, err }