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119 lines
2.8 KiB
TypeScript
119 lines
2.8 KiB
TypeScript
type SimpleFunction<T> = (arg: T) => void;
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type Return<T> = Promise<T> | T;
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async function toPromise<T>(value: Return<T>): Promise<T> {
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return value instanceof Promise ? value : Promise.resolve(value);
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}
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/**
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* Create a promise which waits until `done` is called or until `timeout` period is reached.
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* If `timeout` is reached then this will throw an Error.
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*
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* @param task The task to wait for.
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* @param timeout The timeout period.
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*/
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export async function waitForTask<T>(
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task: (done: SimpleFunction<T>) => Return<void>,
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timeout: number = 2000
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): Promise<T> {
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const timeoutPromise = new Promise<T>((_, rej) => {
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const wait = setTimeout(() => {
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clearTimeout(wait);
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rej(new Error('Task timed out.'));
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}, timeout);
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});
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const taskPromise = new Promise(async (res, rej) => {
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try {
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await toPromise(task(res));
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} catch (e) {
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rej(e);
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}
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});
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return Promise.race([timeoutPromise, taskPromise]) as Promise<T>;
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}
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export interface PollOptions {
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timeout: number;
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interval: number;
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}
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/**
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* Creates a promise which calls the `task` every `interval` until `done` is called or until `timeout` period is reached.
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* If `timeout` is reached then this will throw an Error.
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*
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* @param task The task which runs every `interval` ms.
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* @param options The polling options.
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*/
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export async function poll(
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task: (done: SimpleFunction<void>) => Return<void>,
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options: Partial<PollOptions> = {}
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): Promise<void> {
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const defaults: PollOptions = {
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timeout: 2000,
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interval: 1000,
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};
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const { timeout, interval } = {
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...defaults,
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...options,
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};
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const endTime = Date.now() + timeout;
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let stop = false;
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const finish = () => {
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stop = true;
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};
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const _poll = async (resolve: any, reject: any) => {
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if (stop) {
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resolve();
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} else if (Date.now() >= endTime) {
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finish();
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reject(new Error('Periodic check timeout'));
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} else {
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try {
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await toPromise(task(finish));
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} catch (e) {
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finish();
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reject(e);
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return;
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}
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setTimeout(() => {
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void _poll(resolve, reject);
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}, interval);
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}
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};
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return new Promise((resolve, reject) => {
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void _poll(resolve, reject);
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});
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}
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/**
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* Creates a promise which waits until `check` returns `true` or rejects if `timeout` preiod is reached.
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* If `timeout` is reached then this will throw an Error.
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*
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* @param check The boolean check.
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* @param timeout The time before an error is thrown.
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*/
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export async function waitUntil(
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check: () => Return<boolean>,
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timeout: number = 2000
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) {
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// This is causing unhandled promise rejection somewhere in MessageQueue tests
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return poll(
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async done => {
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const result = await toPromise(check());
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if (result) {
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done();
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}
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},
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{
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timeout,
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}
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);
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}
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