321341a2fb
Also implement locks for tasks that can have unintended side-effects if ran simultaneously. Other minor UI tweaks.
37 lines
920 B
TypeScript
37 lines
920 B
TypeScript
// This is a simple, in-memory lock, which works well enough if you're serving from a single source/server
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function wait(milliseconds = 100) {
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return new Promise((resolve) => setTimeout(() => resolve(true), milliseconds));
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}
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const expirationInMilliseconds = 15 * 1000;
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const locks: Map<string, { expiresAt: Date }> = new Map();
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export default class Locker {
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protected lockName: string = '';
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constructor(lockName: string) {
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this.lockName = lockName;
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}
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public async acquire() {
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const currentLock = locks.get(this.lockName);
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while (currentLock) {
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// Only wait if the lock hasn't expired
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if (currentLock.expiresAt > new Date()) {
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await wait();
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}
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}
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locks.set(this.lockName, {
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expiresAt: new Date(new Date().setMilliseconds(new Date().getMilliseconds() + expirationInMilliseconds)),
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});
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}
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public release() {
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locks.delete(this.lockName);
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}
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}
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