openSocket method

Future<Socket> openSocket(String host, int port, { bool secure = false, SecurityContext? context, })

Opens a socket connection to the specified host and port.

• host: The hostname to connect to.
• port: The port to connect to.
• secure: Whether the connection should be secure (default is false).
• context: An optional SecurityContext for secure connections.
• Returns a connected Socket or throws an error if the connection fails.

Implementation

Future<Socket> openSocket(String host, int port,
    {bool secure = false, SecurityContext? context}) async {
  var addresses = _addressesCache[host] ??= await lookupAddress(host);

  Object? error;

  if (secure) {
    for (var i = 0; i < addresses.length; ++i) {
      var address = addresses[i];
      try {
        var socket = await connectSecureSocket(address, port, context);
        if (i > 0) {
          addresses.removeAt(i);
          addresses.insert(0, address);
        }

        return socket;
      } catch (e) {
        error = e;
      }
    }
  } else {
    for (var i = 0; i < addresses.length; ++i) {
      var address = addresses[i];
      try {
        var socket = await connectSocket(address, port);
        if (i > 0) {
          addresses.removeAt(i);
          addresses.insert(0, address);
        }

        return socket;
      } catch (e) {
        error = e;
      }
    }
  }

  throw error ?? StateError("Can't connect a socket to> $host:$port");
}