@saberhq/snapshots/dist/esm/math.js

The TypeScript SDK for the Saber Voting Escrow Snapshot system.

import invariant from "tiny-invariant";
import { COMMON_ERA_UNIX_TS, ERA_NUM_PERIODS, PERIOD_SECONDS, } from "./constants";
/**
 * Number of seconds in an era.
 */
export const SECONDS_PER_ERA = PERIOD_SECONDS * ERA_NUM_PERIODS;
/**
 * Calculates the era that the given {@link Date} is in.
 * @param date
 * @returns
 */
export const calculateEra = (date) => {
    return Math.floor((Math.floor(date.getTime() / 1000) - COMMON_ERA_UNIX_TS) / SECONDS_PER_ERA);
};
/**
 * Calculates the start date of a period.
 * @param era
 * @param period
 * @returns
 */
export const calculatePeriodStart = (era, period) => {
    return new Date((COMMON_ERA_UNIX_TS + era * SECONDS_PER_ERA + period * PERIOD_SECONDS) *
        1000);
};
/**
 * Calculates the start date of an era.
 * @param era
 * @returns
 */
export const calculateEraStart = (era) => calculatePeriodStart(era, 0);
/**
 * Returns the eras included in a given period.
 *
 * This is useful for figuring out what histories must be fetched.
 *
 * @param start
 * @param end
 * @returns
 */
export const calculateErasForPeriod = (start, end) => {
    const currentEra = calculateEra(start);
    const lastEra = calculateEra(end);
    invariant(lastEra >= currentEra, "Last era must be greater than current era.");
    return Array(lastEra - currentEra + 1)
        .fill(null)
        .map((_, i) => currentEra + i);
};
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