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RxJS + Async Stack Tagging
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<!-- macOS: open -a Google\ Chrome\ Canary --args --js-flags="--experimental-async-stack-tagging-api" --> | |
<!-- Linux: chrome --js-flags="--experimental-async-stack-tagging-api" --> | |
<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<script type="module"> | |
import * as rxjs from "https://unpkg.com/rxjs@7?module"; | |
// Wraps `rxjs::from` to also schedule an async task. | |
// Returns the task and the observable. | |
function from(name, ...args) { | |
const task = console.scheduleAsyncTask(name, true); | |
const observable = rxjs.from(...args); | |
return { task, observable }; | |
} | |
// Wraps `Observable::subscribe` to run an async task with attribution. | |
function subscribe(observable, task, f) { | |
return observable.subscribe({ | |
next(...args) { | |
console.startAsyncTask(task); | |
f(...args); | |
console.finishAsyncTask(task); | |
}, | |
complete() { | |
console.cancelAsyncTask(task); | |
}, | |
}); | |
} | |
// Example adapted from https://www.learnrxjs.io/learn-rxjs/operators/filtering/sample | |
const sequence = from("Hello Task Attribution!", ["foo", "bar", "baz"]); | |
const zipped = rxjs.zip(sequence.observable, rxjs.interval(1000)); | |
const piped = zipped.pipe(rxjs.sample(rxjs.interval(1500))); | |
subscribe(piped, sequence.task, (value) => { | |
console.trace(value); | |
debugger; | |
}); | |
</script> | |
</head> | |
</html> |
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