等待verifyUserSignInSuccess的verifyUser等待等待用户的userSnapshot
这里有两个函数,它们在ReactNative应用程序的正确性,内存,时间方面会更有效:
export function verifyUser() { return async dispatch => { dispatch(verifyUserSignInRequest()); try { const user = await firebase.auth().onAuthStateChanged(); if (user) { let userRef = "/user/" + user.uid; const userSnapshot = await firebase .database() .ref(userRef) .once("value"); dispatch(verifyUserSignInSuccess(userSnapshot.val())); } else { dispatch(verifyUserSignInFailure(USER_NOT_SIGNED_IN)); } } catch (e) { dispatch(verifyUserSignInFailure(e.message)); } }; }
或嵌套异步等待:
export function verifyUser() { return async dispatch => { dispatch(verifyUserSignInRequest()); try { await firebase.auth().onAuthStateChanged(async user => { if (user) { let userRef = "/user/" + user.uid; await firebase .database() .ref(userRef) .once("value") .then( () => { dispatch(verifyUserSignInSuccess(userSnapshot.val())); }); } else { dispatch(verifyUserSignInFailure(USER_NOT_SIGNED_IN)); } }); } catch (e) { dispatch(verifyUserSignInFailure(e.message)); } }; }
根据
documentation,onAuthStateChanged()函数返回
The unsubscribe function for the observer.
所以你可以:
var unsubscribe = firebase.auth().onAuthStateChanged((user) { // handle it for changes signed in,signed out,or when the user's ID token changed in situations such as token expiry or password change });
然后:
退订();注册观察员.
onAuthStateChanged是一个Observer,它在用户登录,注销或在令牌到期或密码更改等情况下更改用户的ID令牌时调用观察者.所以第二个是最好的解决方案.每次登录或更改.
` let userRef = "/user/" + user.uid; await firebase .database() .ref(userRef) .once("value") .then( () => { dispatch(verifyUserSignInSuccess(userSnapshot.val())); }); } else { dispatch(verifyUserSignInFailure(USER_NOT_SIGNED_IN)); }`
交叉检查是正确的是用户是否有效.我不认为有内存比较是必需的.
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