[我们使用了Molecularr网站上的示例作为API网关的基础,当路由引发错误时会出现问题-永远不会遇到onError
处理函数,未处理异常,并且节点使应用程序崩溃。不是这个主意!
[我意识到这不是一个完整的示例,但是如果我们在概念上犯了严重错误,或者如果我们期望可以击中onError
处理程序,那将是一个不错的选择……
const OpenApiMixin = require('./openapi.mixin')
const { MoleculerError } = require('moleculer').Errors
class BadRequestError extends MoleculerError {
constructor (message) {
message = message || 'Bad request'
super(message, 400, 'Bad request')
}
}
...
const functionThatCanThrowError = async (req, res)=>{
if (!req.body.email) {
throw new BadRequestError('No email transferred.')
}
...
}
module.exports = {
name: 'api-gateway',
mixins: [ApiGateway, OpenApiMixin()],
settings: {
...
path: '/',
routes: [
{
path: '/api',
...
aliases: {
'POST /route-can-throw-error': functionThatCanThrowError
},
// Route error handler
onError (req, res, err) {
let { type, code, message, data, name } = err
res.writeHead(Number(code) || 500, { 'Content-Type': 'application/json' })
res.end(JSON.stringify({ type, code, message, data, name }))
}
}
]
}``
functionThatCanThrowError
是中间件。它应该是类似Express的中间件,在该中间件不能抛出错误。为此,您应该致电next(err)
。例如:
const functionThatCanThrowError = async (req, res, next)=>{
if (!req.body.email) {
next(new BadRequestError('No email transferred.'))
}
...
}
更多信息:https://expressjs.com/en/guide/error-handling.html
module.exports = {
name: "api",
mixins: [ApiGateway],
settings: {
port: process.env.PORT || 3000,
routes: [
{
path: "/api",
whitelist: ["**"],
aliases: {
"GET /req-res-error": [
(req, res, next) => {
next(new MoleculerError("Req-Res Error"));
}
],
"GET /action-error": "api.actionError"
},
onError(req, res, err) {
this.logger.error("An Error Occurred!");
res.end("Global error: " + err.message);
}
}
]
},
actions: {
async actionError() {
throw new MoleculerError("ACTION ERROR");
}
}
};