package blobstor import ( "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/common" "go.uber.org/zap" ) // Exists checks if the object is presented in BLOB storage. // // Returns any error encountered that did not allow // to completely check object existence. func (b *BlobStor) Exists(prm common.ExistsPrm) (common.ExistsRes, error) { // check presence in shallow dir first (cheaper) res, err := b.existsBig(prm) // If there was an error during existence check below, // it will be returned unless object was found in blobovnicza. // Otherwise, it is logged and the latest error is returned. // FSTree | Blobovnicza | Behaviour // found | (not tried) | return true, nil // not found | any result | return the result // error | found | log the error, return true, nil // error | not found | return the error // error | error | log the first error, return the second if !res.Exists { var smallErr error res, smallErr = b.existsSmall(prm) if err != nil && (smallErr != nil || res.Exists) { b.log.Warn("error occured during object existence checking", zap.Stringer("address", prm.Address), zap.String("error", err.Error())) err = nil } if err == nil { err = smallErr } } return res, err } // checks if object is presented in shallow dir. func (b *BlobStor) existsBig(prm common.ExistsPrm) (common.ExistsRes, error) { return b.fsTree.Exists(prm) } // existsSmall checks if object is presented in blobovnicza. func (b *BlobStor) existsSmall(prm common.ExistsPrm) (common.ExistsRes, error) { return b.blobovniczas.Exists(prm) }