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

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package shard
import (
"github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/pkg/errors"
)
// ExistsPrm groups the parameters of Exists operation.
type ExistsPrm struct {
addr *object.Address
}
// ExistsRes groups resulting values of Exists operation.
type ExistsRes struct {
ex bool
}
// WithAddress is an Exists option to set object checked for existence.
func (p *ExistsPrm) WithAddress(addr *object.Address) *ExistsPrm {
if p != nil {
p.addr = addr
}
return p
}
// 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.
func (s *Shard) Exists(prm *ExistsPrm) (*ExistsRes, error) {
exists, err := s.objectExists(prm.addr)
if err != nil {
return nil, errors.Wrap(err, "could not check object presence in metabase")
}
return &ExistsRes{
ex: exists,
}, nil
}
func (s *Shard) objectExists(addr *object.Address) (bool, error) {
return s.metaBase.Exists(addr)
}