如何让 onBeforeAction 调用等到内部的函数调用在meteor.js中完成?

How to make onBeforeAction call wait until a function call inside finishes in meteor.js?(如何让 onBeforeAction 调用等到内部的函数调用在meteor.js中完成?)

问题描述

我有一个与 meteor.js 同步的 onBeforeAction 方法

I have a synchronized onBeforeAction method with meteor.js

Router.onBeforeAction(function() {
    var self;

    self = this;

    authToken = Session.get('authToken');

   if (!authToken) {
       this.redirect('login');
       this.next();
   } else {
       Meteor.call('validateAuthToken', authToken, function (error, result)) {
           if (result) {
               self.next();
           } else {
               self.redirect('login');
               self.next();
           }
       }
   }
});

我需要通过调用服务器调用来验证存储在 Session 中的身份验证令牌.但是这个方法在我执行的时候总是会抛出异常.我发现原因是因为 onBeforeAction 调用在 validateAuthToken 调用返回之前终止.因此 self.next() 不会采取行动.所以我想知道我该怎么做才能防止 onBeforeAction 调用停止，直到 validateAuthToken 返回验证结果然后继续?

I need to validate an authentication token stored in Session by invoking a server call. But this method always throws an exception when I am executing it. And I found out the reason is because the onBeforeAction call is terminated before the validateAuthToken call returns. And thus the self.next() won't take action. So I wonder what can I do to prevent the onBeforeAction call from stopping until the validateAuthToken returns the validated result and then proceed?

我通过等待会话变量尝试了不同的实现，但似乎就绪状态从未设置为 true

I've tried a different implementation by wait on a session variable, but it seems the ready state is never set to true

Router.onBeforeAction(function() {
    var authToken;

    authToken = Session.get('authToken');

    if (!authToken) {
        this.redirect('login');
        this.next();
    } else {
        Meteor.call('validateAuthToken', authToken, function (error, result) {
            if (!error) {
                Session.set("tokenValidated", result);
            }
        });

        this.wait(Meteor.subscribe('token', Session.get('tokenValidated')));
        if (this.ready()) {
            if (!Session.get("tokenValidated")) {
                this.redirect('login');
                this.next();
            } else {
                this.next();
            }
        }
    }

});

推荐答案

您也可以使用 https://github.com/iron-meteor/iron-router/issues/426

Ready = new Blaze.ReactiveVar(false);
Router.route('feed',{
  waitOn: function () {
    Meteor.call('getInstagramUserFeed', function(error, result) {
      if(!error) Ready.set(result)
    });
    return [
      function () { return Ready.get(); }
    ];
  },
  action: function () {
    if (this.ready()) this.render('feed')
    else this.render('LoadingMany');
  }
});

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