forked from TrueCloudLab/frostfs-node
67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
package blobstor
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import (
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"errors"
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"fmt"
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"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/common"
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"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/fstree"
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apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
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objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
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)
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// Get reads the object from b.
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// If the descriptor is present, only one sub-storage is tried,
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// Otherwise, each sub-storage is tried in order.
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func (b *BlobStor) Get(prm common.GetPrm) (common.GetRes, error) {
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if prm.BlobovniczaID == nil {
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// Nothing specified, try everything.
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res, err := b.getBig(prm)
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if err == nil || !errors.As(err, new(apistatus.ObjectNotFound)) {
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return res, err
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}
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return b.getSmall(prm)
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}
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if *prm.BlobovniczaID == nil {
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return b.getBig(prm)
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}
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return b.getSmall(prm)
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}
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// getBig reads the object from shallow dir of BLOB storage by address.
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//
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// Returns any error encountered that
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// did not allow to completely read the object.
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//
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// Returns an error of type apistatus.ObjectNotFound if the requested object is not
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// presented in shallow dir.
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func (b *BlobStor) getBig(prm common.GetPrm) (common.GetRes, error) {
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// get compressed object data
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data, err := b.fsTree.Get(prm)
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if err != nil {
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if errors.Is(err, fstree.ErrFileNotFound) {
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var errNotFound apistatus.ObjectNotFound
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return common.GetRes{}, errNotFound
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}
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return common.GetRes{}, fmt.Errorf("could not read object from fs tree: %w", err)
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}
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data, err = b.Decompress(data)
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if err != nil {
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return common.GetRes{}, fmt.Errorf("could not decompress object data: %w", err)
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}
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// unmarshal the object
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obj := objectSDK.New()
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if err := obj.Unmarshal(data); err != nil {
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return common.GetRes{}, fmt.Errorf("could not unmarshal the object: %w", err)
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}
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return common.GetRes{Object: obj}, nil
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}
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func (b *BlobStor) getSmall(prm common.GetPrm) (common.GetRes, error) {
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return b.blobovniczas.Get(prm)
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}
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