Update vendor/

vendor/github.com/asdine/storm/kv.go

@@ -18,6 +18,8 @@ type KeyValueStore interface {
 	GetBytes(bucketName string, key interface{}) ([]byte, error)
 	// SetBytes sets a raw value into a bucket.
 	SetBytes(bucketName string, key interface{}, value []byte) error
+	// KeyExists reports the presence of a key in a bucket.
+	KeyExists(bucketName string, key interface{}) (bool, error)
 }
 
 // GetBytes gets a raw value from a bucket.
@@ -143,3 +145,26 @@ func (n *node) delete(tx *bolt.Tx, bucketName string, id []byte) error {
 
 	return bucket.Delete(id)
 }
+
+// KeyExists reports the presence of a key in a bucket.
+func (n *node) KeyExists(bucketName string, key interface{}) (bool, error) {
+	id, err := toBytes(key, n.codec)
+	if err != nil {
+		return false, err
+	}
+
+	var exists bool
+	return exists, n.readTx(func(tx *bolt.Tx) error {
+		bucket := n.GetBucket(tx, bucketName)
+		if bucket == nil {
+			return ErrNotFound
+		}
+
+		v := bucket.Get(id)
+		if v != nil {
+			exists = true
+		}
+
+		return nil
+	})
+}