如何检测Angular应用程序中与rxjs相关的内存泄漏 [英] How to detect rxjs related memory leaks in Angular apps

问题描述

是否有任何工具或技术可以检测遗留或当前活着的可观察量，订阅。

Is there any tool or technique to detect "left behind" or "currently alive" observables, subscriptions.

最近发现了一个非常令人讨厌的内存泄漏，组件是因缺少取消订阅电话而保持活力。我读到了关于takeUntil的方法，看起来还不错。
https://stackoverflow.com/a/41177163/2050306

Just recently discovered a pretty nasty memory leak where components were kept alive due to missing "unsubscribe" calls. I read about "takeUntil" approach which seems pretty good. https://stackoverflow.com/a/41177163/2050306

然而，我仍然想知道是否有任何工具（浏览器扩展等）。据我所知，Augury不会涵盖这个区域。

However I'm still wondering is there any tool (browser extension etc.) for that. Augury does not cover this area as far as I know.

非常感谢所有输入。

推荐答案

免责声明：我是下面提到的工具的作者。

Disclaimer: I'm the author of the tool I mention below.

这可以通过保留添加新订阅的列表来实现取消订阅后，从此列表中删除订阅。

This can be accomplished by keeping a list where new subscriptions are added to, and removing subscriptions from this list once it is unsubscribed.

麻烦的部分是观察订阅。一种直接的方法是通过猴子修补 Observable＃subscribe（）方法，即替换Observable原型方法。

The troublesome part is observing subscriptions. A straightforward way to achieve this is by monkey-patching the Observable#subscribe() method, that is, replacing the Observable prototype method.

这是 observable-profiler 的总体方法，挂钩到Observable库（即rxjs）并在控制台中打印泄漏订阅的工具。

This is the overall approach of observable-profiler, a development tool which hooks into an Observable library (i.e rxjs) and prints leaking subscriptions in console.

使用探查器的一种简单方法是在应用程序启动后开始跟踪，然后一段时间后停止跟踪：

A simple way to use the profiler is start tracking once the app is bootstraped, then stop tracking after a time:

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { Observable } from 'rxjs';
import { setup, track, printSubscribers } from 'observable-profiler';

setup(Observable);
platformBrowserDynamic([])
    .bootstrapModule(AppModule)
    .then(ref => {
        track();
        window.stopProfiler = () => {
            ref.destroy();
            const subscribers = track(false);
            printSubscribers({
                subscribers,
            });
        }
    });

只需在devtools控制台中调用 stopProfiler（）一旦你想要一份报告。

Just call stopProfiler() in devtools console once you want a report.

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