英文:
express js error handler(s) get ignored after first one
问题
我有一个使用Express.js编写的应用程序，其中包含一些路由和一个受保护的路由，该路由匹配以/app开头的所有端点的调用。之后，我像这样向应用程序添加了通用错误处理程序：
app.use("/app", authenticate);
// app.post("/new_user", validate({body: schema}), route_handler);
// 更多路由等等
app.use((error: TypeError | ValidationError, req: Request, res: Response, next: NextFunction) => {
console.log("检查验证错误");
if (error instanceof ValidationError) {
console.log("找到验证错误");
res.status(403).send(error);
} else {
console.log("没有验证错误");
next();
}
});
app.use((error: TypeError | AuthError, req: Request, res: Response, next: NextFunction) => {
console.log("检查身份验证错误");
if (error instanceof AuthError) {
console.log("找到身份验证错误");
res.status(403).send({ msg: "身份验证失败" });
} else {
console.log("没有身份验证错误");
next();
}
});
app.use((error: Error, req: Request, res: Response, next: NextFunction) => {
console.log("检查通用错误");
if (error) {
res.status(500).send({ msg: "发生了一些通用错误" });
} else {
next();
}
});
app.use((req: Request, res: Response, next: NextFunction) => {
console.log("路由未找到");
res.status(404).send({
msg: "未找到此端点",
});
next();
});
当我对例如以下端点进行请求：https://localhost/app/ 并在此端点故意抛出 AuthError 时，我看到的唯一的 console.log() 是：
检查验证错误
没有验证错误
路由未找到
但我认为我应该看到以下内容：
检查验证错误
没有验证错误
检查身份验证错误
找到身份验证错误
为什么我的身份验证错误中间件从未被调用？
英文:
I have an express js app with some routes and a protected route that matches all the calls to an endpoint that starts with /app. after that i add generic error handler to the app like so:
app.use("/app", authenticate);
// app.post("/new_user", validate({body: schema}), route_handler);
// more routes etc.
app.use((error: TypeError | ValidationError, req: Request, res: Response, next: NextFunction) => {
console.log("CHECK FOR VALIDATION ERROR");
if(error instanceof ValidationError) {
console.log("VALIDATION ERROR FOUND")
res.status(403).send(error);
} else {
console.log("NO VALIDATION ERROR")
next();
}
});
app.use((error: TypeError | AuthError, req: Request, res: Response, next: NextFunction) => {
console.log("CHECK FOR AUTH ERROR");
if(error instanceof AuthError) {
console.log("AUTH ERROR FOUND");
res.status(403).send({msg: "Authentication failed"});
} else {
console.log("NO AUTH ERROR")
next();
}
});
app.use((error: Error, req: Request, res: Response, next: NextFunction) => {
console.log("CHECK GENERIC ERROR");
if(error) {
res.status(500).send({msg: "Some generic error happend"});
} else {
next();
}
});
app.use((req: Request, res: Response, next: NextFunction) => {
console.log("ROUTE NOT FOUND");
res.status(404).send({
msg: "this endpoint was not found",
});
next();
});
When i do a request to for example the following endpoint: https://localhost/app/ and throw a AuthError on purpose in this endpoint the only console.log()'s i ever see are:
CHECK FOR VALIDATION ERROR
NO VALIDATION ERROR
ROUTE NOT FOUND
But i think i should see the following:
CHECK FOR VALIDATION ERROR
NO VALIDATION ERROR
CHECK FOR AUTH ERROR
AUTH ERROR FOUND
Why is my Auth error middleware never called??
答案1
得分: 1
你需要在调用 next 时将 error 传递给其他错误中间件，像这样：
app.use((error: TypeError | AuthError, req: Request, res: Response, next: NextFunction) => {
console.log("检查身份验证错误");
if (error instanceof AuthError) {
console.log("找到身份验证错误");
res.status(403).send({ msg: "身份验证失败" });
} else {
console.log("没有身份验证错误");
next(error);
}
});
没有这样做的话，正常的中间件会被调用。
英文:
You need to pass error to the other error middleware when you call next like this:
app.use((error: TypeError | AuthError, req: Request, res: Response, next: NextFunction) => {
console.log("CHECK FOR AUTH ERROR");
if(error instanceof AuthError) {
console.log("AUTH ERROR FOUND");
res.status(403).send({msg: "Authentication failed"});
} else {
console.log("NO AUTH ERROR")
next(error);
}
});
Without it, the normal middleware will get called.
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