src/utils/Utils.ts

   1 import crypto from 'node:crypto';
   2 import util from 'node:util';
   3
   4 import clone from 'just-clone';
   5
   6 import Constants from './Constants';
   7 import { WebSocketCloseEventStatusString } from '../types/WebSocket';
   8
   9 export default class Utils {
  10   private constructor() {
  11     // This is intentional
  12   }
  13
  14   public static logPrefix(prefixString = ''): string {
  15     return `${new Date().toLocaleString()}${prefixString}`;
  16   }
  17
  18   public static generateUUID(): string {
  19     return crypto.randomUUID();
  20   }
  21
  22   public static validateUUID(uuid: string): boolean {
  23     return /^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$/.test(
  24       uuid
  25     );
  26   }
  27
  28   public static async sleep(milliSeconds: number): Promise<NodeJS.Timeout> {
  29     return new Promise(resolve => setTimeout(resolve as () => void, milliSeconds));
  30   }
  31
  32   public static formatDurationMilliSeconds(duration: number): string {
  33     duration = Utils.convertToInt(duration);
  34     const hours = Math.floor(duration / (3600 * 1000));
  35     const minutes = Math.floor((duration / 1000 - hours * 3600) / 60);
  36     const seconds = duration / 1000 - hours * 3600 - minutes * 60;
  37     let hoursStr = hours.toString();
  38     let minutesStr = minutes.toString();
  39     let secondsStr = seconds.toString();
  40
  41     if (hours < 10) {
  42       hoursStr = `0${hours.toString()}`;
  43     }
  44     if (minutes < 10) {
  45       minutesStr = `0${minutes.toString()}`;
  46     }
  47     if (seconds < 10) {
  48       secondsStr = `0${seconds.toString()}`;
  49     }
  50     return `${hoursStr}:${minutesStr}:${secondsStr.substring(0, 6)}`;
  51   }
  52
  53   public static formatDurationSeconds(duration: number): string {
  54     return Utils.formatDurationMilliSeconds(duration * 1000);
  55   }
  56
  57   public static convertToDate(
  58     value: Date | string | number | null | undefined
  59   ): Date | null | undefined {
  60     if (Utils.isNullOrUndefined(value)) {
  61       return value as null | undefined;
  62     }
  63     if (value instanceof Date) {
  64       return value;
  65     }
  66     if (Utils.isString(value) || typeof value === 'number') {
  67       return new Date(value);
  68     }
  69     return null;
  70   }
  71
  72   public static convertToInt(value: unknown): number {
  73     if (!value) {
  74       return 0;
  75     }
  76     let changedValue: number = value as number;
  77     if (Number.isSafeInteger(value)) {
  78       return value as number;
  79     }
  80     if (typeof value === 'number') {
  81       return Math.trunc(value);
  82     }
  83     if (Utils.isString(value)) {
  84       changedValue = parseInt(value as string);
  85     }
  86     if (isNaN(changedValue)) {
  87       throw new Error(`Cannot convert to integer: ${value.toString()}`);
  88     }
  89     return changedValue;
  90   }
  91
  92   public static convertToFloat(value: unknown): number {
  93     if (!value) {
  94       return 0;
  95     }
  96     let changedValue: number = value as number;
  97     if (Utils.isString(value)) {
  98       changedValue = parseFloat(value as string);
  99     }
 100     if (isNaN(changedValue)) {
 101       throw new Error(`Cannot convert to float: ${value.toString()}`);
 102     }
 103     return changedValue;
 104   }
 105
 106   public static convertToBoolean(value: unknown): boolean {
 107     let result = false;
 108     if (value) {
 109       // Check the type
 110       if (typeof value === 'boolean') {
 111         return value;
 112       } else if (
 113         Utils.isString(value) &&
 114         ((value as string).toLowerCase() === 'true' || value === '1')
 115       ) {
 116         result = true;
 117       } else if (typeof value === 'number' && value === 1) {
 118         result = true;
 119       }
 120     }
 121     return result;
 122   }
 123
 124   public static getRandomFloat(max = Number.MAX_VALUE, min = 0, negative = false): number {
 125     if (max < min || max < 0 || min < 0) {
 126       throw new RangeError('Invalid interval');
 127     }
 128     const randomPositiveFloat = crypto.randomBytes(4).readUInt32LE() / 0xffffffff;
 129     const sign = negative && randomPositiveFloat < 0.5 ? -1 : 1;
 130     return sign * (randomPositiveFloat * (max - min) + min);
 131   }
 132
 133   public static getRandomInteger(max = Constants.MAX_RANDOM_INTEGER, min = 0): number {
 134     max = Math.floor(max);
 135     if (!Utils.isNullOrUndefined(min) && min !== 0) {
 136       min = Math.ceil(min);
 137       return Math.floor(crypto.randomInt(min, max + 1));
 138     }
 139     return Math.floor(crypto.randomInt(max + 1));
 140   }
 141
 142   public static roundTo(numberValue: number, scale: number): number {
 143     const roundPower = Math.pow(10, scale);
 144     return Math.round(numberValue * roundPower) / roundPower;
 145   }
 146
 147   public static truncTo(numberValue: number, scale: number): number {
 148     const truncPower = Math.pow(10, scale);
 149     return Math.trunc(numberValue * truncPower) / truncPower;
 150   }
 151
 152   public static getRandomFloatRounded(max = Number.MAX_VALUE, min = 0, scale = 2): number {
 153     if (min) {
 154       return Utils.roundTo(Utils.getRandomFloat(max, min), scale);
 155     }
 156     return Utils.roundTo(Utils.getRandomFloat(max), scale);
 157   }
 158
 159   public static getRandomFloatFluctuatedRounded(
 160     staticValue: number,
 161     fluctuationPercent: number,
 162     scale = 2
 163   ): number {
 164     if (fluctuationPercent === 0) {
 165       return Utils.roundTo(staticValue, scale);
 166     }
 167     const fluctuationRatio = fluctuationPercent / 100;
 168     return Utils.getRandomFloatRounded(
 169       staticValue * (1 + fluctuationRatio),
 170       staticValue * (1 - fluctuationRatio),
 171       scale
 172     );
 173   }
 174
 175   public static isObject(item: unknown): boolean {
 176     return (
 177       Utils.isNullOrUndefined(item) === false &&
 178       typeof item === 'object' &&
 179       Array.isArray(item) === false
 180     );
 181   }
 182
 183   public static cloneObject<T extends object>(object: T): T {
 184     return clone<T>(object);
 185   }
 186
 187   public static isIterable<T>(obj: T): boolean {
 188     return obj ? typeof obj[Symbol.iterator] === 'function' : false;
 189   }
 190
 191   public static isString(value: unknown): boolean {
 192     return typeof value === 'string';
 193   }
 194
 195   public static isEmptyString(value: unknown): boolean {
 196     return Utils.isString(value) && (value as string).trim().length === 0;
 197   }
 198
 199   public static isUndefined(value: unknown): boolean {
 200     return typeof value === 'undefined';
 201   }
 202
 203   public static isNullOrUndefined(value: unknown): boolean {
 204     // eslint-disable-next-line eqeqeq, no-eq-null
 205     return value == null ? true : false;
 206   }
 207
 208   public static isEmptyArray(object: unknown | unknown[]): boolean {
 209     if (!Array.isArray(object)) {
 210       return true;
 211     }
 212     if (object.length > 0) {
 213       return false;
 214     }
 215     return true;
 216   }
 217
 218   public static isEmptyObject(obj: object): boolean {
 219     if (obj?.constructor !== Object) {
 220       return false;
 221     }
 222     // Iterates over the keys of an object, if
 223     // any exist, return false.
 224     for (const _ in obj) {
 225       return false;
 226     }
 227     return true;
 228   }
 229
 230   public static insertAt = (str: string, subStr: string, pos: number): string =>
 231     `${str.slice(0, pos)}${subStr}${str.slice(pos)}`;
 232
 233   /**
 234    * @param retryNumber - the number of retries that have already been attempted
 235    * @returns delay in milliseconds
 236    */
 237   public static exponentialDelay(retryNumber = 0): number {
 238     const delay = Math.pow(2, retryNumber) * 100;
 239     const randomSum = delay * 0.2 * Utils.secureRandom(); // 0-20% of the delay
 240     return delay + randomSum;
 241   }
 242
 243   public static isPromisePending(promise: Promise<unknown>): boolean {
 244     return util.inspect(promise).includes('pending');
 245   }
 246
 247   public static async promiseWithTimeout<T>(
 248     promise: Promise<T>,
 249     timeoutMs: number,
 250     timeoutError: Error,
 251     timeoutCallback: () => void = () => {
 252       /* This is intentional */
 253     }
 254   ): Promise<T> {
 255     // Create a timeout promise that rejects in timeout milliseconds
 256     const timeoutPromise = new Promise<never>((_, reject) => {
 257       setTimeout(() => {
 258         if (Utils.isPromisePending(promise)) {
 259           timeoutCallback();
 260           // FIXME: The original promise shall be canceled
 261         }
 262         reject(timeoutError);
 263       }, timeoutMs);
 264     });
 265
 266     // Returns a race between timeout promise and the passed promise
 267     return Promise.race<T>([promise, timeoutPromise]);
 268   }
 269
 270   /**
 271    * Generate a cryptographically secure random number in the [0,1[ range
 272    *
 273    * @returns
 274    */
 275   public static secureRandom(): number {
 276     return crypto.randomBytes(4).readUInt32LE() / 0x100000000;
 277   }
 278
 279   public static JSONStringifyWithMapSupport(
 280     obj: Record<string, unknown> | Record<string, unknown>[] | Map<unknown, unknown>,
 281     space?: number
 282   ): string {
 283     return JSON.stringify(
 284       obj,
 285       (key, value: Record<string, unknown>) => {
 286         if (value instanceof Map) {
 287           return {
 288             dataType: 'Map',
 289             value: [...value],
 290           };
 291         }
 292         return value;
 293       },
 294       space
 295     );
 296   }
 297
 298   /**
 299    * Convert websocket error code to human readable string message
 300    *
 301    * @param code - websocket error code
 302    * @returns human readable string message
 303    */
 304   public static getWebSocketCloseEventStatusString(code: number): string {
 305     if (code >= 0 && code <= 999) {
 306       return '(Unused)';
 307     } else if (code >= 1016) {
 308       if (code <= 1999) {
 309         return '(For WebSocket standard)';
 310       } else if (code <= 2999) {
 311         return '(For WebSocket extensions)';
 312       } else if (code <= 3999) {
 313         return '(For libraries and frameworks)';
 314       } else if (code <= 4999) {
 315         return '(For applications)';
 316       }
 317     }
 318     if (!Utils.isUndefined(WebSocketCloseEventStatusString[code])) {
 319       return WebSocketCloseEventStatusString[code] as string;
 320     }
 321     return '(Unknown)';
 322   }
 323 }