Deps galore
Kuba Orlik
3 years ago
parent
04a4fa2953
commit
e24cc50bc3
@ -1,96 +0,0 @@
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import { deferedSpawn } from "async-spawner";
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import Emittery from "emittery";
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import { promisify } from "util";
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//needed to pass information on wether or not the promise has been aborted witout 'this'
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class AbortableEmittery extends Emittery {
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public aborted = false;
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abort() {
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this.aborted = true;
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this.emit("abort");
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}
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}
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class AbortablePromise<T> extends Promise<T | null> {
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private emitter: AbortableEmittery;
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constructor(
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make_generator: (
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await_or_abort: (
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promise: Promise<any>,
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on_abort: () => void
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) => Promise<void>
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) => AsyncGenerator
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) {
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const emitter = new AbortableEmittery();
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const await_or_abort = (
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promise: Promise<any>,
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on_abort: () => void
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) => {
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return new Promise((resolve, reject) => {
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let resolved = false;
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emitter.on("abort", () => {
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if (!resolved) {
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on_abort();
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resolve(null);
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resolved = true;
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}
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});
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promise
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.then((result) => {
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if (!resolved) {
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resolve(result);
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resolved = true;
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}
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})
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.catch(reject);
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});
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};
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super(async (resolve, reject) => {
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let step_value;
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const generator = make_generator(await_or_abort);
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do {
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if (emitter.aborted) {
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resolve(null);
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return;
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}
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step_value = await generator.next();
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} while (!step_value.done);
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});
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this.emitter = emitter;
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}
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abort() {
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this.emitter.abort();
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}
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}
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// const sleep = promisify((timeout: number, callback: (...args: any[]) => void) =>
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// setTimeout(callback, timeout)
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// );
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// const a = new AbortablePromise(async function* () {
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// yield await sleep(1000);
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// console.log("awaited 100");
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// yield await sleep(2000);
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// console.log("awaited 200");
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// yield await sleep(3000);
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// console.log("awaited 300");
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// });
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// setTimeout(() => a.abort(), 1500);
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const b = new AbortablePromise(async function* (await_or_abort) {
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const ping = await deferedSpawn("ping", ["8.8.8.8"]);
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while (true) {
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console.log(
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await await_or_abort(ping.waitForNextData(), () => {
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ping.kill();
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})
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);
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yield;
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}
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});
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setTimeout(() => b.abort(), 5000);
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