Question

我使用TypeScript使用Node和Express创建了一个非常简单的REST API，异步路由用包装器包装起来以捕获所有错误，并在中间件中进行处理。

我已经使用js的一个非常基本的示例尝试了相同的包装器和中间件，并且效果很好，我不知道它会逃避我，我希望有人能帮助我。

我将包含要测试的路由的类和服务器的类留在这里：

const asyncWrapper = (fn: any) => (req: Request, res: Response, next: any): Promise<any> => Promise.resolve(fn(req, res, next)).catch(next);

const errorHandlingMiddlware = (error: any, req: Request, res: Response, next: NextFunction) => {

res.status(450);
res.json({
    ok: false,
    error: error.message
});
next(); 
}

class ClientRoutes {

public router: Router;

constructor(){
    this.router = Router();
    this.routes();
}

//get a client for our db, receives an id on url.
async getClient(req: Request, res: Response, next: NextFunction): Promise<void>{

        const id: String = req.params.id;   
        const client: Client|null = await ClientModel.findById(id);

        res.json({
            ok: true,
            client
        });

    }

routes(){
    this.router.get('/:id',asyncWrapper(this.getClient));
}}



const clientRoutes: ClientRoutes = new ClientRoutes();
export default clientRoutes.router;

class Server {

    public app: express.Application;

    constructor(){
        this.app = express();
        this.config();
        this.routes();
    }



    config(){
        const MONGODB_URI: string = 'mongodb://localhost/paint_admin_db';
        mongoose.connect(process.env.MONGODB_URI || MONGODB_URI,{
            useNewUrlParser: true,
            useCreateIndex: true,
            useFindAndModify: false
        });
        //Settings
        this.app.set('port',process.env.PORT || 3000);
        //Middlewares
        this.app.use(express.json());
        this.app.use(express.urlencoded({extended: false}));
        this.app.use(helmet());
        this.app.use(compression());
        this.app.use(cors());
        this.app.use(myLogger);
        this.app.use(errorHandlingMiddlware);
    }


    routes(){
        this.app.use('/api/clients',ClientRoutes);
        this.app.use('/api/tasks',TaskRoutes)
    }


    start(){
        const port = this.app.get('port');
        this.app.listen(port,() => console.log(`Server on port: ${port}`));
    }
}

使用不存在的ID调用getClient路由会引发典型的猫鼬错误。

为什么下一个包装器不能正常工作？

0 个答案: