我有一个与 meteor.js 同步的 onBeforeAction 方法
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 token 。但是这个方法在我执行的时候总是抛出异常。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。所以我想知道我可以做些什么来防止 onBeforeAction 调用停止,直到 validateAuthToken 返回验证结果然后继续?
我已经通过等待 session 变量尝试了不同的实现,但似乎就绪状态从未设置为 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();
}
}
}
});
最佳答案
编辑 :在稍微解决这个问题之后,我想出了一个工作示例(没有无限循环)。您可以使用以下代码:
Util = {};
// We need to store the dep, ready flag, and data for each call
Util.d_waitOns = {};
// This function returns a handle with a reactive ready function, which
// is what waitOn expects. waitOn will complete when the reactive function
// returns true.
Util.waitOnServer = function(name) {
// This prevents the waitOnServer call from being called multiple times
// and the resulting infinite loop.
if (this.d_waitOns[name] !== undefined &&
this.d_waitOns[name].ready === true) {
return;
}
else {
this.d_waitOns[name] = {};
}
var self = this;
// We need to store the dependency and the ready flag.
this.d_waitOns[name].dep = new Deps.Dependency();
this.d_waitOns[name].ready = false;
// Perform the actual async call.
Meteor.call(name, function(err, or) {
// The call has complete, so set the ready flag, notify the reactive
// function that we are ready, and store the data.
self.d_waitOns[name].ready = true;
self.d_waitOns[name].dep.changed();
self.d_waitOns[name].data = (err || or);
});
// The reactive handle that we are returning.
var handle = {
ready: function() {
self.d_waitOns[name].dep.depend();
return self.d_waitOns[name].ready;
}
};
return handle;
}
// Retrieve the data that we stored in the async callback.
Util.getResponse = function(name) {
return this.d_waitOns[name].data;
}
像这样从 waitOn 调用:
Router.route("/test", {
name: "test",
action: function() {
console.log("The data is ", Util.getResponse("testWaitOn"));
},
waitOn: function() {
return Util.waitOnServer("testWaitOn");
}
})
我写了一篇博文,里面有更深入的解释,你可以在这里找到:
http://www.curtismlarson.com/blog/2015/05/04/meteor-ironrouter-waitOn-server/
关于meteor - 如何让 onBeforeAction 调用等到 meteor.js 中的函数调用完成?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29493809/