Question

我想要重新抛出错误但保留原始错误的跟踪。在普通的旧同步javascript中可以这样做：

 try {
  processThings();
} catch (e) {
  const moreDetailedError = new Error("Couldn't process things due to: " + e.message);
  moreDetailedError.original = e;
  moreDetailedError.stack = moreDetailedError.stack + '\nCaused by:\n' + e.stack;

  throw moreDetailedError;
}

function processThings() {
  throw new Error('Internal error');
}

生成的堆栈跟踪如下所示：

Error: Couldn't process things due to: Internal error
    at Object.<anonymous> (test.js:8:29)
    at Module._compile (module.js:570:32)
    [...]
    at bootstrap_node.js:509:3
Caused by:
Error: Internal error
    at processThings (test.js:16:9)
    at Object.<anonymous> (test.js:6:3)
    at Module._compile (module.js:570:32)
    [...]
    at bootstrap_node.js:509:3

这正是我想要的。现在我希望能够在蓝鸟的承诺链延续中做同样的事情。这是基于承诺的等效代码（必须与BLUEBIRD_DEBUG=1一起运行才能获得长堆栈跟踪）：

const Promise = require('bluebird');

Promise.try(processThings).catch(e => {
  const moreDetailedError = new Error("Couldn't process things due to: " + e.message);
  moreDetailedError.original = e;
  moreDetailedError.stack = moreDetailedError.stack + '\nCaused by:\n' + e.stack;

  throw moreDetailedError;
});

function processThings() {
  throw new Error('Internal error');
}

但是，bluebird似乎吞下了我的Caused by信息，只是给了我moreDetailedError没有原始信息的堆栈跟踪：

Unhandled rejection Error: Couldn't process things due to: Internal error
    at Promise.try.catch.e (test.js:6:29)
    at runCallback (timers.js:637:20)
    [...]
    at Object.<anonymous> (test.js:5:12)
From previous event:
    at Object.<anonymous> (test.js:5:33)
    at Module._compile (module.js:570:32)
    [...]
    at bootstrap_node.js:509:3

有没有办法让蓝鸟在最后通过正确的方式获得修改后的堆栈？

Answer 1

我能够通过简单地将原始错误的堆栈附加到更详细的错误的[[[Ljava.lang.String;@2a3046da, [[Ljava.lang.String;@2a098129, [[Ljava.lang.String;@198e2867, [[Ljava.lang.String;@12f40c25, [[Ljava.lang.String;@3ada9e37]来解决问题，而不是操纵其堆栈跟踪。不是我想要的解决方案，但它适用于我的目的。

node.js：在bluebird

1 个答案: