reactjs - How to achieve callbacks in Redux-Saga?

Question

The scenario is, I want to redirect a user or show alert based on the success, error callbacks after dispatching an action.

Below is the code using redux-thunk for the task

this.props.actions.login(credentials)
.then((success)=>redirectToHomePage)
.catch((error)=>alertError);

because the dispatch action in redux-thunk returns a Promise, It is easy to act with the response.

But now I'm getting my hands dirty on redux-saga, and trying to figure out how I can achieve the same result as above code. since Saga's run on a different thread, there is no way I can get the callback from the query above. so I just wanted to know how you guys do it. or whats the best way to deal with callbacks while using redux-saga ? the dispatch action looks like this :

this.props.actions.login(credentials);

and the saga

function* login(action) {
  try {
    const state = yield select();
    const token = state.authReducer.token;
    const response = yield call(API.login,action.params,token);
    yield put({type: ACTION_TYPES.LOGIN_SUCCESS, payload:response.data});
    yield call(setItem,AUTH_STORAGE_KEY,response.data.api_token);
  } catch (error) {
    yield put({type: ACTION_TYPES.LOGIN_FAILURE, error})
  }
}

saga monitor

export function* loginMonitor() {
  yield takeLatest(ACTION_TYPES.LOGIN_REQUEST,login);
}

action creator

function login(params) {
  return {
    type: ACTION_TYPES.LOGIN_REQUEST,
    params
  }
}

Answer 1

I spent all day dinking around with this stuff, switching from thunk to redux-saga

I too have a lot of code that looks like this

this.props.actions.login(credentials)
.then((success)=>redirectToHomePage)
.catch((error)=>alertError);

its possible to use thunk + saga

function login(params) {
  return (dispatch) => {
    return new Promise((resolve, reject) => {
      dispatch({
        type: ACTION_TYPES.LOGIN_REQUEST,
        params,
        resolve, 
        reject
      })
    }
  }
}

then over in saga land you can just do something like

function* login(action) {
  let response = yourApi.request('http://www.urthing.com/login')
  if (response.success) {
    action.resolve(response.success) // or whatever
  } else { action.reject() }
}