javascript - 我的错误处理代码的哪一部分可能导致Heroku崩溃？

Question

问题:我在代码中引入了错误处理，如果出现问题，该错误处理应呈现一个错误页面和一条错误消息。在此特定情况下，当用户尝试未登录而访问保护路由时，将显示错误页面。相反，Heroku仅等待30秒并崩溃。奇怪的是，一切都在LocalHost上按预期工作。
虽然我不确定，但我认为错误是来自以下代码中的某处(调用const sendErrorDev函数时)。一切工作都找到了，直到我介绍了这一点。但是，我不确定是什么导致Heroku与LocalHost的结果有所不同。

const AppError = require('../utils/appError');

const JsonWebTokenError = () =>
  new AppError('Invalid token. Please login again!', 401);

const handleJWTExpiredError = () =>
  new AppError('Your token has EXPIRED! What?!', 401);

const handleCastErrorDB = err => {
  const message = `Invalid ${err.path}: ${err.value}.`;
  return new AppError(message, 400);
};

const handleDuplicateFieldsDB = err => {
  const value = err.errmsg.match(/(["'])(?:(?=(\\?))\2.)*?\1/)[0];
  console.log(value);
  const message = `Duplicate field value: ${value}. Please use another value!`;
  return new AppError(message, 400);
};

const handleValidationErrorDB = err => {
  const errors = Object.values(err.errors).map(el => el.message);
  const message = `Invalid input data. ${errors.join('. ')}`;
  return new AppError(message, 400);
};

const sendErrorDev = (err, req, res) => {
  // A. API
  if (req.originalUrl.startsWith('/api')) {
    return res.status(err.statusCode).json({
      status: err.status,
      error: err,
      message: err.message,
      stack: err.stack
    });
  }
  // B. RENDERED WEBSITE
  return res.status(err.statusCode).render('error', {
    title: 'Something went wrong!',
    msg: err.message
  });
};

const sendErrorProd = (err, req, res) => {
  // A) API
  console.log('This is working!!!');
  if (req.originalUrl.startsWith('/api')) {
    // A) Trusted operaitonal error, okay to send the details to the client.
    if (err.isOperational) {
      return res.status(err.statusCode).json({
        status: err.status,
        message: err.message
      });
    }
    // Weird coding errors, don't leak the details to the client.
    // 1.) Log the error to the
    console.error('ERROR!', err);
    // 2.) Send generic message to the client
    return res.status(500).json({
      status: 'error',
      message: 'Something went very wrong! JESUS!'
    });
  }
  // B) Rendered Website
  if (err.isOperational) {
    console.log(err);
    return res.status(err.statusCode).render('error', {
      title: 'Something went wrong!',
      msg: err.message
    });
  }
  // Weird coding errors, don't leak the details to the client.
  // 1.) Log the error to the
  console.error('ERROR!', err);
  // 2.) Send generic message to the client
  return res.status(err.statusCode).render('error', {
    title: 'Something went wrong!',
    msg: 'Please try again later.'
  });
};

module.exports = (err, req, res, next) => {
  //console.log(err.stack);
  err.statusCode = err.statusCode || 500;
  err.status = err.status || 'error';

  if (process.env.NODE_ENV === 'development') {
    sendErrorDev(err, req, res);
  } else if (process.env.NODE_ENV === 'production') {
    let error = { ...err };
    error.message = err.message;
    if (error.name === 'CastError') error = handleCastErrorDB(error);
    if (error.code === 11000) error = handleDuplicateFieldsDB(error);
    if (error.name === 'ValidationError')
      error = handleValidationErrorDB(error);
    if (error.name === 'JsonWebTokenError') error = JsonWebTokenError();
    if (error.name === 'TokenExpiredError') error = handleJWTExpiredError();

    sendErrorProd(error, req, res);
  }
};

Answer 1

在Heroku中，我拼错了一个配置变量。我更正后，问题消失了。