closeStatus property

@override CloseStatus? get closeStatus

How the connection was closed, by either side: the code and reason of the close frame. null while it is open.

Implementation

@override
CloseStatus? get closeStatus {
  final guard = _guard;
  if (guard != null && guard.aborted) {
    return _local;
  }
  final received = switch (_socket.closeCode) {
    final code? => CloseStatus(code, switch (_socket.closeReason) {
      final reason? when reason.isNotEmpty => reason,
      _ => null,
    }),
    null => null,
  };
  // The input ended without a close frame (1006, no reason) after this
  // side closed, or after the output met the error that broke the
  // connection: _local has the status passed to close, or the error. (A
  // close frame that arrived is the other side's answer: it wins.)
  if (received != null &&
      received.code == CloseStatus.noCloseFrame.code &&
      _local != null) {
    return _local;
  }
  // A broken connection: dart:io reports 1002 when the input side saw
  // the error, 1006 when the output side saw it first (the guard then
  // destroys the socket, and the input just ends without a close
  // frame), 1005 for a close frame without a code whose answer failed,
  // or nothing yet while the application holds the messages back.
  // dart:io gives no reason then; _local has the error (or the status
  // this side closed with first).
  if (guard != null &&
      guard.broken != null &&
      (received == null ||
          received.code == CloseStatus.protocolError.code ||
          received.code == CloseStatus.noStatusCode.code ||
          received.code == CloseStatus.noCloseFrame.code)) {
    return _local;
  }
  return received ?? _local;
}