Future _fetchByHash()

in builder/lib/src/commits_cache.dart [79:105]

• 25 lines of code
• 9 McCabe index (conditional complexity)

  Future<Commit?> _fetchByHash(String hash) async {
    final commit = await firestore.getCommit(hash);
    if (commit == null) return null;
    final index = commit.index;
    if (startIndex == null) {
      _cacheCommit(commit);
    } else if (index < startIndex!) {
      for (var fetchIndex = startIndex! - 1; fetchIndex > index; --fetchIndex) {
        // Other invocations may be fetching simultaneously.
        if (fetchIndex < startIndex!) {
          final infillCommit = await firestore.getCommitByIndex(fetchIndex);
          _cacheCommit(infillCommit);
        }
      }
      _cacheCommit(commit);
    } else if (index > endIndex!) {
      for (var fetchIndex = endIndex! + 1; fetchIndex < index; ++fetchIndex) {
        // Other invocations may be fetching simultaneously.
        if (fetchIndex > endIndex!) {
          final infillCommit = await firestore.getCommitByIndex(fetchIndex);
          _cacheCommit(infillCommit);
        }
      }
      _cacheCommit(commit);
    }
    return commit;
  }