提问者:小点点

Express.js UnhandledPromiserEjectionWarning:未处理的promise拒绝


所以我有以下代码:

app.post('/api/login', async function (req, res){
  try  {
    let [sorted,users] = await getSorted();
    const pw = req.body.password;
    const submittedUser = req.body.username;
    const hashedPassword = await bcrypt.hash(req.body.password, 10);
    // const user = { id: req.body.id, username: req.body.username, password: req.body.password };
    // USERNAME = FIRSTNAME
    var user = new User({firstname: req.body.username, eMail: req.body.eMail, password: hashedPassword });
    sorted.forEach(async ([firstname, password]) => {
      let result = bcrypt.compareSync(pw, password);
      // r = true if hash = hashed pw
      var serializeCookie = function(key, value, hrs) {
        // This is res.cookie’s code without the array management and also ignores signed cookies.
        if ('number' == typeof value) value = val.toString();
        if ('object' == typeof value) value = JSON.stringify(val);
        return cookie.serialize(key, value, { expires: new Date(Date.now() + 1000 * 60 * hrs), httpOnly: true });
      }; 

      var setMultipleCookies = function(res) {
        set_cookies.push(getCookie(access_token, myValue1.toString(), default_cookie_age));
        set_cookies.push(getCookie(loggedinid, myValue2.toString(), default_cookie_age));
        res.header("Set-Cookie", set_cookies);
      } 
      set_cookies = ['loggedinid', id]
      if (result === true && firstname == submittedUser) {
        jwt2.sign({user}, 'secrethere', { expiresIn: '15min'}, (err, token) =>{
          set_cookies.push('access_token'+ 'Bearer'+token).header("Set-Cookie", set_cookies)
                     .json(user);
        });
      }
      else {
        res.status(200).send("bad login");
      } 
    });    
  } catch (err) {
    res.status(500).send();
    console.log(err);
  }
});

我要被赶出去的错误:

(node:6628) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:6628) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

我想要完成的是:

我的登录功能,以前肯定是工作的,需要一些拉皮条,以便设置多个cookie。我在SO上发现了一个问题,我再也找不到了,它说明有一个bug和一些注释,也许它已经修复了,但是没有发现任何证据,因为代码就是不能工作。所以我不得不做这个黑客,我在我的代码中实现了它,它给了我这些错误。set_cookies=['loggedinid',id]应获取第二个cookie作为键loggedinid和值变量id。Id是MongoDB Id名称


共1个答案

匿名用户

至少这些问题:

>

  • foreach回调中没有任何await,因此将回调标记为async没有任何意义。删除这个关键字,你就不会再得到未经处理的拒绝承诺。更改:

    sorted.forEach(async ([firstname, password]) => {
    

    致:

    sorted.forEach(([firstname, password]) => {
    

    以下语句引用了不存在的header属性:

    set_cookies.push('access_token'+ 'Bearer'+token).header("Set-Cookie", set_cookies)
               .json(user);
    

    push的返回值是一个整数,因此不能对其调用.header()。会触发异常。可能您打算在res上调用.header():

    set_cookies.push('access_token'+ 'Bearer'+token);
    res.header("Set-Cookie", set_cookies)
       .json(user);
    

    该行中有未定义的变量id:

    set_cookies = ['loggedinid', id]
    

    我不能确切地说出您在这里的意图,但是您应该确保已经定义了id并且具有适当的值

    从未定义SerializEcookie中的变量Val。您可能想要value

    还有其他一些与你的问题无关的问题,比如:

    >

  • 两个函数SerializEcookieSetMultipleCookies从不调用。

    如果您确实打算使用SerializEcookie,那么它在写入数据的方式上是相当不一致的。这里确实不应该有任何类型检查if。它应该总是这样:

    value = JSON.stringify(value);
    

    函数可以是:

    var serializeCookie = function(key, value, hrs) {
        return cookie.serialize(key, JSON.stringify(value), 
               { expires: new Date(Date.now() + 1000 * 60 * hrs), httpOnly: true });
    }; 
    

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