74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
package blobstor
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import (
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"os"
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"github.com/nspcc-dev/neofs-api-go/pkg/object"
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objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
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"github.com/pkg/errors"
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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 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 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 !exists {
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// TODO: do smth if err != nil
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// check presence in blobovnicza
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exists, err = b.existsSmall(prm.addr)
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}
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if err != nil {
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return nil, err
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}
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return &ExistsRes{
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exists: exists,
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}, 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 *object.Address) (bool, error) {
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_, err := b.fsTree.exists(addr)
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if errors.Is(err, 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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// checks if object is presented in blobovnicza.
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func (b *BlobStor) existsSmall(addr *object.Address) (bool, error) {
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// TODO: implement
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return false, nil
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}
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func (t *fsTree) exists(addr *objectSDK.Address) (string, error) {
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p := t.treePath(addr)
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_, err := os.Stat(p)
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if os.IsNotExist(err) {
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err = errFileNotFound
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}
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return p, err
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}
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