nextSourceAfter function

String? nextSourceAfter(
  1. String failed,
  2. List<String> candidates
)

The next source to try after failed, or null when the chain is exhausted.

Returns null for a source that is not in the chain at all, so a pipeline the user picked by hand fails with its own error instead of silently restarting the platform chain from somewhere in the middle.

Implementation

String? nextSourceAfter(String failed, List<String> candidates) {
  final int index = candidates.indexOf(failed);
  if (index == -1 || index + 1 >= candidates.length) return null;
  return candidates[index + 1];
}