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/*
This file is part of GNU Taler
(C) 2017-2019 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* Cross-platform timers.
*
* NodeJS and the browser use slightly different timer API,
* this abstracts over these differences.
*/
/**
* Imports.
*/
import { Logger, Duration } from "@gnu-taler/taler-util";
const logger = new Logger("timer.ts");
/**
* Cancelable timer.
*/
export interface TimerHandle {
clear(): void;
/**
* Make sure the event loop exits when the timer is the
* only event left. Has no effect in the browser.
*/
unref(): void;
}
class IntervalHandle {
constructor(public h: any) { }
clear(): void {
clearInterval(this.h);
}
/**
* Make sure the event loop exits when the timer is the
* only event left. Has no effect in the browser.
*/
unref(): void {
if (typeof this.h === "object") {
this.h.unref();
}
}
}
class TimeoutHandle {
constructor(public h: any) { }
clear(): void {
clearTimeout(this.h);
}
/**
* Make sure the event loop exits when the timer is the
* only event left. Has no effect in the browser.
*/
unref(): void {
if (typeof this.h === "object") {
this.h.unref();
}
}
}
/**
* Get a performance counter in nanoseconds.
*/
export const performanceNow: () => bigint = (() => {
// @ts-ignore
if (typeof process !== "undefined" && process.hrtime) {
return () => {
return process.hrtime.bigint();
};
}
// @ts-ignore
if (typeof performance !== "undefined") {
// @ts-ignore
return () => BigInt(Math.floor(performance.now() * 1000)) * BigInt(1000);
}
return () => BigInt(0);
})();
const nullTimerHandle = {
clear() {
// do nothing
return;
},
unref() {
// do nothing
return;
},
};
/**
* Group of timers that can be destroyed at once.
*/
export interface TimerAPI {
after(delayMs: number, callback: () => void): TimerHandle;
every(delayMs: number, callback: () => void): TimerHandle;
}
export class SetTimeoutTimerAPI implements TimerAPI {
/**
* Call a function every time the delay given in milliseconds passes.
*/
every(delayMs: number, callback: () => void): TimerHandle {
return new IntervalHandle(setInterval(callback, delayMs));
}
/**
* Call a function after the delay given in milliseconds passes.
*/
after(delayMs: number, callback: () => void): TimerHandle {
return new TimeoutHandle(setTimeout(callback, delayMs));
}
}
export const timer = new SetTimeoutTimerAPI();
/**
* Implementation of [[TimerGroup]] using setTimeout
*/
export class TimerGroup {
private stopped = false;
private readonly timerMap: { [index: number]: TimerHandle } = {};
private idGen = 1;
constructor(public readonly timerApi: TimerAPI) { }
stopCurrentAndFutureTimers(): void {
this.stopped = true;
for (const x in this.timerMap) {
if (!this.timerMap.hasOwnProperty(x)) {
continue;
}
this.timerMap[x].clear();
delete this.timerMap[x];
}
}
resolveAfter(delayMs: Duration): Promise<void> {
return new Promise<void>((resolve, reject) => {
if (delayMs.d_ms !== "forever") {
this.after(delayMs.d_ms, () => {
resolve();
});
}
});
}
after(delayMs: number, callback: () => void): TimerHandle {
if (this.stopped) {
logger.warn("dropping timer since timer group is stopped");
return nullTimerHandle;
}
const h = this.timerApi.after(delayMs, callback);
const myId = this.idGen++;
this.timerMap[myId] = h;
const tm = this.timerMap;
return {
clear() {
h.clear();
delete tm[myId];
},
unref() {
h.unref();
},
};
}
every(delayMs: number, callback: () => void): TimerHandle {
if (this.stopped) {
logger.warn("dropping timer since timer group is stopped");
return nullTimerHandle;
}
const h = this.timerApi.every(delayMs, callback);
const myId = this.idGen++;
this.timerMap[myId] = h;
const tm = this.timerMap;
return {
clear() {
h.clear();
delete tm[myId];
},
unref() {
h.unref();
},
};
}
}
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