David Walsh
32 lines
1.2 KiB
TypeScript
32 lines
1.2 KiB
TypeScript
import * as crypto from 'crypto';
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import * as ethUtil from 'ethereumjs-util';
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import { BigNumber } from '@0x/utils';
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/**
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* Generate a random integer between `min` and `max`, inclusive.
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*/
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export function getRandomInteger(min: BigNumber | string | number, max: BigNumber | string | number): BigNumber {
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const range = new BigNumber(max).minus(min);
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return getRandomPortion(range).plus(min);
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}
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/**
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* Generate a random integer between `0` and `total`, inclusive.
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*/
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function getRandomPortion(total: BigNumber | string | number): BigNumber {
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return new BigNumber(total).times(getRandomFloat(0, 1)).integerValue(BigNumber.ROUND_HALF_UP);
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}
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export function randomAddress(): string {
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return ethUtil.bufferToHex(crypto.randomBytes(20));
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}
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/**
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* Generate a random, high-precision decimal between `min` and `max`, inclusive.
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*/
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export function getRandomFloat(min: BigNumber | string | number, max: BigNumber | string | number): BigNumber {
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// Generate a really high precision number between [0, 1]
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const r = new BigNumber(crypto.randomBytes(32).toString('hex'), 16).dividedBy(new BigNumber(2).pow(256).minus(1));
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return new BigNumber(max).minus(min).times(r).plus(min);
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}
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