Unreliable network connection timeout parameters about sdk

[dart-github-bot]

Summary: The SecureSocket.connect() method with a specified timeout parameter does not consistently throw a timeout exception when the connection exceeds the set duration, leading to unreliable network connection timeouts. This issue requires investigation to determine why the timeout parameter is not being enforced as expected.

[a-siva]

//cc @brianquinlan

[brianquinlan]

We might not apply the timeout early enough:

  static Future<_NativeSocket> connect(dynamic host, int port,
      dynamic sourceAddress, int sourcePort, Duration? timeout) {
    return startConnect(host, port, sourceAddress, sourcePort)
        .then((ConnectionTask<_NativeSocket> task) {
      Future<_NativeSocket> socketFuture = task.socket;
      if (timeout != null) {
        socketFuture = socketFuture.timeout(timeout, onTimeout: () {
          task.cancel();
          throw createError(
              null, "Connection timed out, host: ${host}, port: ${port}");
        });
      }
      return socketFuture;
    });
  }

[tilongzs]

close() also encountered the same problem. Suggest conducting a unified investigation to identify potential issues with interfaces with timeouts.