mirror of
https://github.com/element-hq/element-web.git
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50 lines
1.7 KiB
TypeScript
50 lines
1.7 KiB
TypeScript
/*
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Copyright 2019, 2020 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Returns a promise which resolves when the input promise resolves with its value
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// or when the timeout of ms is reached with the value of given timeoutValue
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export async function timeout<T, Y>(promise: Promise<T>, timeoutValue: Y, ms: number): Promise<T | Y> {
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const timeoutPromise = new Promise<T | Y>((resolve) => {
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const timeoutId = window.setTimeout(resolve, ms, timeoutValue);
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promise.then(() => {
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clearTimeout(timeoutId);
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});
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});
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return Promise.race([promise, timeoutPromise]);
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}
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// Helper method to retry a Promise a given number of times or until a predicate fails
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export async function retry<T, E extends Error>(
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fn: () => Promise<T>,
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num: number,
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predicate?: (e: E) => boolean,
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): Promise<T> {
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let lastErr!: any;
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for (let i = 0; i < num; i++) {
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try {
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const v = await fn();
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// If `await fn()` throws then we won't reach here
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return v;
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} catch (err) {
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if (predicate && !predicate(err as E)) {
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throw err;
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}
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lastErr = err;
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}
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}
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throw lastErr;
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}
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