af-consul/dist/esm/src/lib/hash.js

A highly specialized function library

import * as _ from 'lodash';
import * as XXH from 'xxhashjs';
import { isObject } from './utils';
const getHash = (data, base = '32', seed = 0xCAFEBABE) => {
    let stringToHash = '';
    if (data === undefined) {
        stringToHash = '#thisisundefined#';
    }
    else if (data === null) {
        stringToHash = '#thisisnull#';
    }
    else if (data === '') {
        stringToHash = '#thisisemptystring#';
    }
    else if (Array.isArray(data)) {
        const arr = data.map((value) => ([value, getHash(String(value) + (typeof value), '32', seed)]));
        arr.sort(([, a], [, b]) => {
            if (a < b)
                return -1;
            if (a > b)
                return 1;
            return 0;
        });
        stringToHash = JSON.stringify(arr.map(([v]) => v));
    }
    else if (isObject(data)) {
        const op = Object.prototype.toString.call(data); // === '[object Date]'
        switch (op) {
            case '[object Function]':
            case '[object Date]':
                stringToHash += data.toString();
                break;
            // case '[object Object]':
            default: {
                const keys = Object.keys(data).sort();
                keys.forEach((key) => {
                    stringToHash += key + getHash(data[key], base, seed);
                });
            }
        }
    }
    else if (typeof data === 'string') {
        stringToHash = data;
    }
    else if (typeof data === 'number') {
        stringToHash = `i${String(data)}`;
    }
    else if (typeof data === 'boolean') {
        stringToHash = `b${data ? 1 : 0}`;
    }
    else if (typeof data === 'function') {
        stringToHash = `f${data.toString()}`;
    }
    return XXH[`h${base}`](stringToHash, seed).toString(16);
};
export const getConfigHash = (options) => {
    const opt = _.pick(options.config, ['consul', 'webServer']);
    const hash = getHash(opt);
    options.hash = hash;
    return hash;
};
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