room.js

export function connectToChannel(socket, roomId) {
  return (dispatch) => {
    if (!socket) { return false; }
    const channel = socket.channel(`rooms:${roomId}`);

    channel.join().receive('ok', (response) => {
      dispatch({ type: 'ROOM_CONNECTED_TO_CHANNEL', response, channel });
    });

    return false;
  };
}

export function leaveChannel(channel) {
  return (dispatch) => {
    if (channel) {
      channel.leave();
    }
    dispatch({ type: 'USER_LEFT_ROOM' });
  };
}