passport.js和process.nextTick在策略中 [英] passport.js and process.nextTick in strategy

问题描述

我在nodeJS中面临新问题： process.nextTick

I'm facing something new in nodeJS: process.nextTick

在某些策略中，护照的代码示例.js，我们可以看到

In some strategies code examples for passport.js, we can see

passport.use(new LocalStrategy(
  function (username, password, done) {

    // asynchronous verification, for effect...
    process.nextTick(function () {

      findByUsername(username, function (err, user) {
        // ...
        bcrypt.compare(password, user.password, function (err, res) {
          // ...
        });
      })
    });
  }
));

但在官方文档中，没有使用。 （ http://passportjs.org/guide/username-password/ ）

But in the official documentation, it is not used. (http://passportjs.org/guide/username-password/)

我所理解的是，应该使用 process.nextTick 来延迟同步堆栈以阻止事件。但是在这个策略代码中，没有事件。

What I understand is that process.nextTick should be used to defer synchronous stack to not block an event. But in this strategy code, there is no event.

这里有什么好处？

推荐答案

在示例中只显示异步认证是可能的。在大多数情况下，您会查询数据库，因此它本质上是异步的。然而，这个例子只是一个硬编码的用户组，所以 nextTick 调用是有效的，以模拟异步函数。

It's only there in the example to show that async authentication is possible. In most cases, you'd be querying a database, so it'd be async in nature. However, the example just has a hard-coded set of users, so the nextTick call is there for effect, to simulate an async function.

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