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import { Codec, renderContext, Context } from "./codec";
/*
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/>
*/
/**
* Helpers for relative and absolute time.
*/
export class Timestamp {
/**
* Timestamp in milliseconds.
*/
readonly t_ms: number | "never";
}
export interface Duration {
/**
* Duration in milliseconds.
*/
readonly d_ms: number | "forever";
}
let timeshift = 0;
export function setDangerousTimetravel(dt: number): void {
timeshift = dt;
}
export function getTimestampNow(): Timestamp {
return {
t_ms: new Date().getTime() + timeshift,
};
}
export function getDurationRemaining(
deadline: Timestamp,
now = getTimestampNow(),
): Duration {
if (deadline.t_ms === "never") {
return { d_ms: "forever" };
}
if (now.t_ms === "never") {
throw Error("invalid argument for 'now'");
}
if (deadline.t_ms < now.t_ms) {
return { d_ms: 0 };
}
return { d_ms: deadline.t_ms - now.t_ms };
}
export function timestampMin(t1: Timestamp, t2: Timestamp): Timestamp {
if (t1.t_ms === "never") {
return { t_ms: t2.t_ms };
}
if (t2.t_ms === "never") {
return { t_ms: t2.t_ms };
}
return { t_ms: Math.min(t1.t_ms, t2.t_ms) };
}
/**
* Truncate a timestamp so that that it represents a multiple
* of seconds. The timestamp is always rounded down.
*/
export function timestampTruncateToSecond(t1: Timestamp): Timestamp {
if (t1.t_ms === "never") {
return { t_ms: "never" };
}
return {
t_ms: Math.floor(t1.t_ms / 1000) * 1000,
};
}
export function durationMin(d1: Duration, d2: Duration): Duration {
if (d1.d_ms === "forever") {
return { d_ms: d2.d_ms };
}
if (d2.d_ms === "forever") {
return { d_ms: d2.d_ms };
}
return { d_ms: Math.min(d1.d_ms, d2.d_ms) };
}
export function timestampCmp(t1: Timestamp, t2: Timestamp): number {
if (t1.t_ms === "never") {
if (t2.t_ms === "never") {
return 0;
}
return 1;
}
if (t2.t_ms === "never") {
return -1;
}
if (t1.t_ms == t2.t_ms) {
return 0;
}
if (t1.t_ms > t2.t_ms) {
return 1;
}
return -1;
}
export function timestampAddDuration(t1: Timestamp, d: Duration): Timestamp {
if (t1.t_ms === "never" || d.d_ms === "forever") {
return { t_ms: "never" };
}
return { t_ms: t1.t_ms + d.d_ms };
}
export function timestampSubtractDuraction(
t1: Timestamp,
d: Duration,
): Timestamp {
if (t1.t_ms === "never") {
return { t_ms: "never" };
}
if (d.d_ms === "forever") {
return { t_ms: 0 };
}
return { t_ms: Math.max(0, t1.t_ms - d.d_ms) };
}
export function stringifyTimestamp(t: Timestamp): string {
if (t.t_ms === "never") {
return "never";
}
return new Date(t.t_ms).toISOString();
}
export function timestampDifference(t1: Timestamp, t2: Timestamp): Duration {
if (t1.t_ms === "never") {
return { d_ms: "forever" };
}
if (t2.t_ms === "never") {
return { d_ms: "forever" };
}
return { d_ms: Math.abs(t1.t_ms - t2.t_ms) };
}
export function timestampIsBetween(
t: Timestamp,
start: Timestamp,
end: Timestamp,
): boolean {
if (timestampCmp(t, start) < 0) {
return false;
}
if (timestampCmp(t, end) > 0) {
return false;
}
return true;
}
export const codecForTimestamp: Codec<Timestamp> = {
decode(x: any, c?: Context): Timestamp {
const t_ms = x.t_ms;
if (typeof t_ms === "string") {
if (t_ms === "never") {
return { t_ms: "never" };
}
throw Error(`expected timestamp at ${renderContext(c)}`);
}
if (typeof t_ms === "number") {
return { t_ms };
}
throw Error(`expected timestamp at ${renderContext(c)}`);
},
};
export const codecForDuration: Codec<Duration> = {
decode(x: any, c?: Context): Duration {
const d_ms = x.d_ms;
if (typeof d_ms === "string") {
if (d_ms === "forever") {
return { d_ms: "forever" };
}
throw Error(`expected duration at ${renderContext(c)}`);
}
if (typeof d_ms === "number") {
return { d_ms };
}
throw Error(`expected duration at ${renderContext(c)}`);
},
};
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