reactjs – 放置firebase.auth()的位置.onAuthStateChanged()

现在,我从我的auth reducer获取用户身份验证时设置的用户的loggedIn状态,但我希望在页面刷新后使用onAuthStateChanged()保持loggedIn状态.

我应该在哪里放置onAuthStateChanged()函数？有没有最好的做法来使用它？

我的代码供以下参考：

App.js

<PrivateRoute path="/dashboard" component={Dashboard} />
<Route path="/login" component={Login} />

ProtectedRoute.js

const PrivateRoute = ({ component: Component,...rest }) => {
const { loggedIn } = rest;
return (
    <Route {...rest} render={props => (
      loggedIn ? (<Component {...props} />) : (
        <Redirect to={{
          pathname: '/login',state: { from: props.location }
        }} />
      )
    )} />
  )
}

function mapStateToProps({auth}){
  return {
    loggedIn: auth.loggedIn
  }
}
export default connect(mapStateToProps)(PrivateRoute);

actions_auth.js

export const loginUser = ({ email,password },callback ) => {
console.log(email,password)
return(dispatch) => {
  dispatch({ type: LOGIN_USER });
  auth.signInWithEmailAndPassword(email,password)
    .then(
      user => { 
        dispatch({
        type: LOGIN_USER_SUCCESS,payload: user
    });
    callback();
  },error => { 
      console.log( error.message );        
      dispatch({ 
        type: LOGIN_USER_FAIL,error: error.message 
      });
    }
  )
 }
}

reducer_auth.js

const INITIAL_STATE = {
  email: '',password: '',error: '',loading: false,loggedIn: false
};

export default (state = INITIAL_STATE,action) => {
  switch (action.type) {
    case EMAIL_CHANGED:
      return { ...state,email: action.payload };
    case PASSWORD_CHANGED:
      return { ...state,password: action.payload };
    case LOGIN_USER:
      return { ...state,loading: true,error: '' };
    case LOGIN_USER_SUCCESS:          
      return { ...state,...INITIAL_STATE,user: action.payload,loggedIn: true };
    case LOGIN_USER_FAIL:
      return { ...state,error: action.error };
    case LOGOUT_USER:
      return { ...state,...INITIAL_STATE };
    default:
      return state;
  }
};