ExpressJS:承诺和错误处理中间件 [英] ExpressJS: Promises and Error Handling middleware

问题描述

我定义了一些错误处理中间件，并且路由返回了Promise.但是，当那个承诺产生错误时，我必须在每个承诺之后手动附加.catch(err => next(err)).虽然这不是问题，但ExpressJ判断路由是否返回了诺言是否明智?如果是，则自动调用错误处理中间件.

I have some error handling middleware defined and a route returning a promise. But when that promise gives an error, I have to manually append .catch(err => next(err)) after every promise. While its not a problem, isn't it sensible for ExpressJs to see if a route returns a promise and if so call the error handling middleware automatically.

我当前的简化代码:

// errorHandlers.js
function sequelizeValidationError (err, req, res, next) {
  if (err.name && err.name == 'SequelizeValidationError')
    res.status(400).send(err.errors)
  else next(err)
}

// auth.js
router.post ('/register',  middleware.isNotAuthenticated, (req, res, next) => {
  const { email, password, name } = req.body;

  return models.User.find({where : { email }}).then(user => {
    if (user) {
      if (user.password == password) sendToken(user.id, res);
      else res.sendStatus(401);
    } else {
      return models.User.create({
        email, password, name
      }).then(user => {
        sendToken(user.id, res);
      })
    }
  }).catch(next)
})

// index.js
router.use('/auth', require('./auth'))

router.use(errorHandlers.sequelizeValidationError)

例如，当前我可能忘记在一个地方写catch，并且服务器将发生故障.

For example, currently I could have forgot to write catch at one place and the server would have failed.

我错过了什么吗?如何避免每次都要键入catch?

Am I missing out on something? How can I avoid having to type the catch every time?

推荐答案

这是已提交.

我提交了重复错误

到目前为止，最好的选择似乎是使用包装函数.

As of now the best bet seems to be to use a wrap function .

另请参见上面的@robertklep的注释.如果不使用route-params， promise-express-router 可能会有用. express-co 似乎是一个包装函数+更多基于生成器的优点

Also see @robertklep 's comment above. promise-express-router may be useful if you donot use route-params . express-co seems to be a wrap function + more generator-based goodness

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