frontend/src/sagas/home.js


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import { apply, call, put, take } from "redux-saga/effects";
import { createSubscriptionChannel } from "../utils/websocket";
import { push } from "react-router-redux";

import { actions, types } from "../redux/players";

function* sendUsername({ socket }) {
  while (true) {
    const { username } = yield take(types.REQUEST_CHOOSE_USERNAME);
    yield apply(socket, socket.send, [
      "/app/chooseName",
      JSON.stringify({ playerName: username })
    ]);
  }
}

function* validateUsername({ socket }) {
  const usernameChannel = yield call(
    createSubscriptionChannel,
    socket,
    "/user/queue/nameChoice"
  );
  while (true) {
    const user = yield take(usernameChannel);
    yield put(actions.setCurrentPlayer(user));
    yield apply(usernameChannel, usernameChannel.close);
    yield put(push("/games"));
  }
}

function* usernameChoiceSaga(wsConnection) {
  // TODO: Run sendUsername in loop when we have the ability to cancel saga on route change
  yield [
    call(sendUsername, wsConnection),
    call(validateUsername, wsConnection)
  ];
}

export default usernameChoiceSaga;