node.js 中的生产质量错误处理

Question

我正在处理 node.js 服务器应用程序中的请求错误处理。我已经定义了一个处理这些错误的回调函数：

app.use(function errorHandler(err, req, res, next) {    
    res.send(err, {status: err, message: 'error'}); 

  }
);

作为开发人员，这对我来说很好，因为它会打印如下堆栈跟踪：

{
"status": {
  "stack": "Error\\n    at MongooseError.ValidationError (/home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/error/validation.js:22:16)\\n    at model.Document.invalidate (/home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/document.js:1216:32)\\n    at /home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/document.js:1090:18\\n    at validate (/home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/schematype.js:653:7)\\n    at /home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/schematype.js:681:9\\n    at Array.forEach (native)\\n    at SchemaString.SchemaType.doValidate (/home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/schematype.js:658:19)\\n    at /home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/document.js:1088:11\\n    at process._tickCallback (node.js:415:13)",
  "message": "User validation failed",
  "name": "ValidationError",
  "errors": {
    "email": {
      "properties": {
        "regexp": {},
        "type": "regexp",
        "message": "Path `{PATH}` is invalid ({VALUE}).",
        "path": "email",
        "value": "test@exa@mple.com"
      },
      "stack": "Error\\n    at MongooseError.ValidatorError (/home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/error/validator.js:25:16)\\n    at validate (/home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/schematype.js:652:13)\\n    at /home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/schematype.js:681:9\\n    at Array.forEach (native)\\n    at SchemaString.SchemaType.doValidate (/home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/schematype.js:658:19)\\n    at /home/osboxes/skipodium_rest_server/node_modules/mongoose/lib/document.js:1088:11\\n    at process._tickCallback (node.js:415:13)",
      "message": "Path `email` is invalid (test@exa@mple.com).",
      "name": "ValidatorError",
      "kind": "regexp",
      "path": "email",
      "value": "test@exa@mple.com"
    }
  }
},
"message": "error"
}

但是，我想在生产版本中以一种简洁、用户友好的格式显示它，而不会泄露整个堆栈跟踪。现在我可以在每个请求处理函数中指定错误状态和消息，但仍然有特定信息，如上所示，输入的电子邮件无效，我不想为每个检查的字段手动输入由验证者。是否有任何现有的样板可以为我完成这项工作？

Answer 1

Mongoose 验证错误很难处理。我的一般方法是只处理第一个错误（让用户一次处理一个错误）并发送路径和消息，因为其余的不会真正为非开发人员带来太多额外的意义。

first = err.errors[Object.keys(err.errors)[0]]
res.send({
    path: first.path,
    message: first.message
});

我还建议使用自定义 API 风格的错误格式，您可以坚持使用它来处理所有错误 - 这将使可维护性变得更加容易。

我有一套我依赖的预定义错误模板 - 这是一个。

// If the client missed a required parameter
exports.missingParam = function (res, domain, param) {
   res.status(400).send({
      status: "failed",
      errors: [
         {
            status: "400",
            domain: domain,
            reason: "required",
            message: "Required parameter: "+param,
            locationType: "parameter",
            location: param
         }
      ]
   });
}

node.js 中的生产质量错误处理

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