[#787] util/attributes: Restore escape characters after caching the result

As soon as resulting list and cache operate with the attribute pointer,
we can add attribute structure immediately and set restored key and
value of the attribute later.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/util/attributes/parser.go

@@ -59,16 +59,16 @@ func ParseV2Attributes(attrs []string, excl []string) ([]*netmap.NodeAttribute,
 			}
 
 			if !present {
+				attribute = netmap.NewNodeAttribute()
+				cache[key] = attribute
+				result = append(result, attribute)
+
 				// replace non-printable symbols with escaped symbols without escape character
 				key = replaceEscaping(key, true)
 				value = replaceEscaping(value, true)
 
-				attribute = netmap.NewNodeAttribute()
 				attribute.SetKey(key)
 				attribute.SetValue(value)
-
-				cache[key] = attribute
-				result = append(result, attribute)
 			}
 
 			if parentKey != "" {

pkg/util/attributes/parser_test.go

@@ -74,6 +74,13 @@ func TestParseV2Attributes(t *testing.T) {
 		attrs, err := attributes.ParseV2Attributes(from, nil)
 		require.NoError(t, err)
 		require.Len(t, attrs, 1)
+
+		t.Run("with escape characters", func(t *testing.T) {
+			from = []string{`/a\::b\/`, `/a\::b\/`}
+			attrs, err := attributes.ParseV2Attributes(from, nil)
+			require.NoError(t, err)
+			require.Len(t, attrs, 1)
+		})
 	})
 
 	t.Run("multiple parents", func(t *testing.T) {