frostfs-node/pkg/local_object_storage/metabase/v2/exists.go

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package meta
import (
objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-node/pkg/core/object"
"go.etcd.io/bbolt"
)
// Exists returns ErrAlreadyRemoved if addr was marked as removed. Otherwise it
// returns true if addr is in primary index or false if it is not.
func (db *DB) Exists(addr *objectSDK.Address) (exists bool, err error) {
err = db.boltDB.View(func(tx *bbolt.Tx) error {
exists, err = db.exists(tx, addr)
return err
})
return exists, err
}
func (db *DB) exists(tx *bbolt.Tx, addr *objectSDK.Address) (exists bool, err error) {
// check graveyard first
if inGraveyard(tx, addr) {
return false, object.ErrAlreadyRemoved
}
objKey := objectKey(addr.ObjectID())
// if graveyard is empty, then check if object exists in primary bucket
if inBucket(tx, primaryBucketName(addr.ContainerID()), objKey) {
return true, nil
}
// if primary bucket is empty, then check if object exists in parent bucket
if inBucket(tx, parentBucketName(addr.ContainerID()), objKey) {
return true, nil
}
// if parent bucket is empty, then check if object exists in tombstone bucket
if inBucket(tx, tombstoneBucketName(addr.ContainerID()), objKey) {
return true, nil
}
// if parent bucket is empty, then check if object exists in storage group bucket
return inBucket(tx, storageGroupBucketName(addr.ContainerID()), objKey), nil
}
// inGraveyard returns true if object was marked as removed.
func inGraveyard(tx *bbolt.Tx, addr *objectSDK.Address) bool {
graveyard := tx.Bucket(graveyardBucketName)
if graveyard == nil {
return false
}
tombstone := graveyard.Get(addressKey(addr))
return len(tombstone) != 0
}
// inBucket checks if key <key> is present in bucket <name>.
func inBucket(tx *bbolt.Tx, name, key []byte) bool {
bkt := tx.Bucket(name)
if bkt == nil {
return false
}
// using `get` as `exists`: https://github.com/boltdb/bolt/issues/321
val := bkt.Get(key)
return len(val) != 0
}