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