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

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package shard
import (
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor"
meta "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/metabase"
oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
"go.uber.org/zap"
)
// 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
}
// WithAddress is an Exists option to set object checked for existence.
func (p *ExistsPrm) WithAddress(addr oid.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.
//
// Returns an error of type apistatus.ObjectAlreadyRemoved if object has been marked as removed.
func (s *Shard) Exists(prm ExistsPrm) (ExistsRes, error) {
var existsPrm meta.ExistsPrm
existsPrm.WithAddress(prm.addr)
res, err := s.metaBase.Exists(existsPrm)
exists := res.Exists()
if err != nil {
// If the shard is in degraded mode, try to consult blobstor directly.
// Otherwise, just return an error.
if s.GetMode() == ModeDegraded {
var p blobstor.ExistsPrm
p.SetAddress(prm.addr)
res, bErr := s.blobStor.Exists(p)
if bErr == nil {
exists = res.Exists()
s.log.Warn("metabase existence check finished with error",
zap.Stringer("address", prm.addr),
zap.String("error", err.Error()))
err = nil
}
}
}
return ExistsRes{
ex: exists,
}, err
}