我对 Nodejs 相当陌生,所以我将更详细地解释我想要做什么。
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,我会在控制台上看到堆栈跟踪(但我必须重新启动服务器)。
所以我想我的问题是:
如何访问承诺失败处理程序中的堆栈跟踪?
EDIT:当然,欢迎任何关于如何改进解释的建议。如果我没有说清楚,请告诉我。
记录错误对象不会打印错误的堆栈跟踪。
你需要具体询问:
console.error('You had an error: ', err.stack);
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