forked from TrueCloudLab/frostfs-node
78 lines
2.1 KiB
Go
78 lines
2.1 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/fstree"
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oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
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"go.uber.org/zap"
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)
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// ExistsPrm groups the parameters of Exists operation.
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type ExistsPrm struct {
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address
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}
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// ExistsRes groups the resulting values of Exists operation.
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type ExistsRes struct {
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exists bool
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}
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// Exists returns the fact that the object is in BLOB storage.
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func (r ExistsRes) Exists() bool {
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return r.exists
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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 ExistsPrm) (ExistsRes, error) {
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// check presence in shallow dir first (cheaper)
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exists, err := b.existsBig(prm.addr)
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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 !exists {
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var smallErr error
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exists, smallErr = b.existsSmall(prm.addr)
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if err != nil && (smallErr != nil || exists) {
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b.log.Warn("error occured during object existence checking",
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zap.Stringer("address", prm.addr),
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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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if err != nil {
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return ExistsRes{}, err
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}
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return ExistsRes{exists: exists}, 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(addr oid.Address) (bool, error) {
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_, err := b.fsTree.Exists(addr)
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if errors.Is(err, fstree.ErrFileNotFound) {
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return false, nil
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}
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return 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(addr oid.Address) (bool, error) {
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return b.blobovniczas.Exists(addr)
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}
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