61 lines
1.7 KiB
TypeScript
61 lines
1.7 KiB
TypeScript
/*
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This file is part of GNU Taler
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(C) 2019 GNUnet e.V.
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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export interface OpenedPromise<T> {
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promise: Promise<T>;
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resolve: (val: T) => void;
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reject: (err: any) => void;
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}
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/**
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* Get an unresolved promise together with its extracted resolve / reject
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* function.
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*/
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export function openPromise<T>(): OpenedPromise<T> {
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let resolve: ((x?: any) => void) | null = null;
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let reject: ((reason?: any) => void) | null = null;
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const promise = new Promise<T>((res, rej) => {
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resolve = res;
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reject = rej;
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});
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if (!(resolve && reject)) {
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// Never happens, unless JS implementation is broken
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throw Error();
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}
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return { resolve, reject, promise };
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}
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export class AsyncCondition {
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private _waitPromise: Promise<void>;
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private _resolveWaitPromise: (val: void) => void;
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constructor() {
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const op = openPromise<void>();
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this._waitPromise = op.promise;
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this._resolveWaitPromise = op.resolve;
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}
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wait(): Promise<void> {
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return this._waitPromise;
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}
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trigger(): void {
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this._resolveWaitPromise();
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const op = openPromise<void>();
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this._waitPromise = op.promise;
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this._resolveWaitPromise = op.resolve;
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}
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}
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