修改或保存数据到请求对象中 [英] Modify or save data in request object in fastify

问题描述

我使用nestjs构建REST API.

I use nestjs to build a REST API.

我有一个中间件，该中间件从redis缓存中加载数据，并应将其保存在请求对象中以在控制器功能中进行访问.

I have a middleware which loads data from redis cache and should save it in the request object to access it in the controller function.

如果我使用express作为引擎，它可以工作，但是使用fastify则不能工作.数据在控制器功能中未定义.

If i use express as engine it works, but with fastify it doesn't work. The data is undefined in the controller function.

代码如下:

function mymiddleware(req, res, next) => {
    req.data = {...};
    next();
};

推荐答案

这是一个简单的工作示例:

this is a simple working example:

const fastify = require('fastify')({ logger: true })

fastify.use(function (req, res, next) {
  console.log('middy')
  req.data = { hello: 'world' }
  next();
})

fastify.get('/', (req, res) => {
  res.send(`hello ${req.raw.data.hello}`)
})

fastify.listen(3000)

我认为您的问题是由于req对象造成的:在中间件(使用.use注册)中，您将获得标准的Node.js请求，而不是在fastify处理程序中增强的HTTPRequest.

I think that your problem is due to the req object: in middleware (registered using .use you will get the standard Node.js request, instead of augmented HTTPRequest in the fastify handler.

因此，您可以通过.raw字段访问低级Http请求.

So, you can access the low-level Http request with .raw field.

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