package engine import ( "errors" "github.com/nspcc-dev/neofs-node/pkg/core/object" "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard" "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/util" objectSDK "github.com/nspcc-dev/neofs-sdk-go/object" addressSDK "github.com/nspcc-dev/neofs-sdk-go/object/address" "go.uber.org/zap" ) // GetPrm groups the parameters of Get operation. type GetPrm struct { addr *addressSDK.Address } // GetRes groups resulting values of Get operation. type GetRes struct { obj *objectSDK.Object } // WithAddress is a Get option to set the address of the requested object. // // Option is required. func (p *GetPrm) WithAddress(addr *addressSDK.Address) *GetPrm { if p != nil { p.addr = addr } return p } // Object returns the requested object. func (r *GetRes) Object() *objectSDK.Object { return r.obj } // Get reads an object from local storage. // // Returns any error encountered that // did not allow to completely read the object part. // // Returns ErrNotFound if requested object is missing in local storage. // // Returns an error if executions are blocked (see BlockExecution). func (e *StorageEngine) Get(prm *GetPrm) (res *GetRes, err error) { err = e.execIfNotBlocked(func() error { res, err = e.get(prm) return err }) return } func (e *StorageEngine) get(prm *GetPrm) (*GetRes, error) { if e.metrics != nil { defer elapsed(e.metrics.AddGetDuration)() } var ( obj *objectSDK.Object siErr *objectSDK.SplitInfoError outSI *objectSDK.SplitInfo outError = object.ErrNotFound shardWithMeta hashedShard metaError error ) shPrm := new(shard.GetPrm). WithAddress(prm.addr) e.iterateOverSortedShards(prm.addr, func(_ int, sh hashedShard) (stop bool) { res, err := sh.Get(shPrm) if err != nil { if res.HasMeta() { shardWithMeta = sh metaError = err } switch { case errors.Is(err, object.ErrNotFound): return false // ignore, go to next shard case errors.As(err, &siErr): siErr = err.(*objectSDK.SplitInfoError) if outSI == nil { outSI = objectSDK.NewSplitInfo() } util.MergeSplitInfo(siErr.SplitInfo(), outSI) // stop iterating over shards if SplitInfo structure is complete if outSI.Link() != nil && outSI.LastPart() != nil { return true } return false case errors.Is(err, object.ErrAlreadyRemoved): outError = err return true // stop, return it back default: e.reportShardError(sh, "could not get object from shard", err) return false } } obj = res.Object() return true }) if outSI != nil { return nil, objectSDK.NewSplitInfoError(outSI) } if obj == nil { if shardWithMeta.Shard == nil || !errors.Is(outError, object.ErrNotFound) { return nil, outError } // If the object is not found but is present in metabase, // try to fetch it from blobstor directly. If it is found in any // blobstor, increase the error counter for the shard which contains the meta. shPrm = shPrm.WithIgnoreMeta(true) e.iterateOverSortedShards(prm.addr, func(_ int, sh hashedShard) (stop bool) { res, err := sh.Get(shPrm) obj = res.Object() return err == nil }) if obj == nil { return nil, outError } e.reportShardError(shardWithMeta, "meta info was present, but object is missing", metaError, zap.Stringer("address", prm.addr)) } return &GetRes{ obj: obj, }, nil } // Get reads object from local storage by provided address. func Get(storage *StorageEngine, addr *addressSDK.Address) (*objectSDK.Object, error) { res, err := storage.Get(new(GetPrm). WithAddress(addr), ) if err != nil { return nil, err } return res.Object(), nil }