Question

我对nodejs比较陌生，所以我会更详细地解释一下我想要做什么。

我有一个网络服务器。如果请求失败，我想记录该异常的堆栈跟踪，但是提供错误页面而不是使服务器崩溃。

例如，处理请求的函数：

var Q = require('q');

var requestHandler = function () {
    // Here I get the data etc. that was requested. As this is not important, just a dummy here
    Q.resolve()
        // Now I answer the request
        .then(function (data) {
            // Dummy Code representing the sending of a response
            console.log('sending response …');
            console.log('oh no! an exception');
            // Now an Exception occurs
            throw new Error('You did something wrong!');
        })
        // If there was any error, show the error page instead
        .fail(function (err) {
            // Dummy Code representing the sending of the error page
            console.log('sending error page');
            // Additionally I want to write the error into a log file
            console.error('You had an error: ', err);
        })
        // If there was an error in the .fail-handler, I deserve the server to crash
        .done();
};

// A request comes in, I want to call my handler
requestHandler();

控制台的输出：

sending response …
oh no! an exception
sending error page
You had an error:  [Error: You did something wrong!]

我看不到访问堆栈跟踪的方法。但是当我在.fail-handler中抛出异常（或者只是省略完整的.fail-handler）时，我在控制台上获得了一个堆栈跟踪（但我必须重新启动服务器）。

所以我想我的问题是：

如何在promise失败处理程序中访问堆栈跟踪？

编辑：欢迎任何有关如何改进说明的提示，当然。如果我没有说清楚，请告诉我。

Answer 1

记录错误对象不会打印错误的堆栈跟踪。你需要具体要求：

console.error('You had an error: ', err.stack);

使用promises - 在失败处理程序中记录堆栈跟踪

1 个答案: