frostfs-node/pkg/local_object_storage/shard/exists.go

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package shard
import (
"context"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
)
// ExistsPrm groups the parameters of Exists operation.
type ExistsPrm struct {
addr oid.Address
}
// ExistsRes groups the resulting values of Exists operation.
type ExistsRes struct {
ex bool
}
// SetAddress is an Exists option to set object checked for existence.
func (p *ExistsPrm) SetAddress(addr oid.Address) {
p.addr = addr
}
// Exists returns the fact that the object is in the shard.
func (p ExistsRes) Exists() bool {
return p.ex
}
// Exists checks if object is presented in shard.
//
// Returns any error encountered that does not allow to
// unambiguously determine the presence of an object.
//
// Returns an error of type apistatus.ObjectAlreadyRemoved if object has been marked as removed.
// Returns the object.ErrObjectIsExpired if the object is presented but already expired.
func (s *Shard) Exists(ctx context.Context, prm ExistsPrm) (ExistsRes, error) {
var exists bool
var err error
s.m.RLock()
defer s.m.RUnlock()
if s.info.Mode.NoMetabase() {
var p common.ExistsPrm
p.Address = prm.addr
var res common.ExistsRes
res, err = s.blobStor.Exists(ctx, p)
exists = res.Exists
} else {
var existsPrm meta.ExistsPrm
existsPrm.SetAddress(prm.addr)
var res meta.ExistsRes
res, err = s.metaBase.Exists(existsPrm)
exists = res.Exists()
}
return ExistsRes{
ex: exists,
}, err
}