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