1 import { randomBytes
, randomInt
, randomUUID
} from
'node:crypto';
2 import { inspect
} from
'node:util';
10 millisecondsToMinutes
,
11 millisecondsToSeconds
,
13 secondsToMilliseconds
,
15 import deepClone from
'deep-clone';
17 import { Constants
} from
'./Constants';
18 import { type TimestampedData
, WebSocketCloseEventStatusString
} from
'../types';
20 export const logPrefix
= (prefixString
= ''): string => {
21 return `${new Date().toLocaleString()}${prefixString}`;
24 export const generateUUID
= (): string => {
28 export const validateUUID
= (uuid
: string): boolean => {
29 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(
34 export const sleep
= async (milliSeconds
: number): Promise
<NodeJS
.Timeout
> => {
35 return new Promise
<NodeJS
.Timeout
>((resolve
) => setTimeout(resolve
as () => void, milliSeconds
));
38 export const formatDurationMilliSeconds
= (duration
: number): string => {
39 duration
= convertToInt(duration
);
40 const days
= Math.floor(duration
/ (24 * 3600 * 1000));
41 const hours
= Math.floor(millisecondsToHours(duration
) - days
* 24);
42 const minutes
= Math.floor(
43 millisecondsToMinutes(duration
) - days
* 24 * 60 - hoursToMinutes(hours
),
45 const seconds
= Math.floor(
46 millisecondsToSeconds(duration
) -
48 hoursToSeconds(hours
) -
49 minutesToSeconds(minutes
),
51 return formatDuration({
59 export const formatDurationSeconds
= (duration
: number): string => {
60 return formatDurationMilliSeconds(secondsToMilliseconds(duration
));
63 // More efficient time validation function than the one provided by date-fns
64 export const isValidTime
= (date
: unknown
): boolean => {
65 if (typeof date
=== 'number') {
67 } else if (isDate(date
)) {
68 return !isNaN((date
as Date).getTime());
73 export const convertToDate
= (
74 value
: Date | string | number | null | undefined,
75 ): Date | null | undefined => {
76 if (isNullOrUndefined(value
)) {
77 return value
as null | undefined;
82 if (isString(value
) || typeof value
=== 'number') {
83 return new Date(value
!);
88 export const convertToInt
= (value
: unknown
): number => {
92 let changedValue
: number = value
as number;
93 if (Number.isSafeInteger(value
)) {
94 return value
as number;
96 if (typeof value
=== 'number') {
97 return Math.trunc(value
);
99 if (isString(value
)) {
100 changedValue
= parseInt(value
as string);
102 if (isNaN(changedValue
)) {
103 // eslint-disable-next-line @typescript-eslint/no-base-to-string
104 throw new Error(`Cannot convert to integer: ${value.toString()}`);
109 export const convertToFloat
= (value
: unknown
): number => {
113 let changedValue
: number = value
as number;
114 if (isString(value
)) {
115 changedValue
= parseFloat(value
as string);
117 if (isNaN(changedValue
)) {
118 // eslint-disable-next-line @typescript-eslint/no-base-to-string
119 throw new Error(`Cannot convert to float: ${value.toString()}`);
124 export const convertToBoolean
= (value
: unknown
): boolean => {
128 if (typeof value
=== 'boolean') {
130 } else if (isString(value
) && ((value
as string).toLowerCase() === 'true' || value
=== '1')) {
132 } else if (typeof value
=== 'number' && value
=== 1) {
139 export const getRandomFloat
= (max
= Number.MAX_VALUE
, min
= 0): number => {
141 throw new RangeError('Invalid interval');
143 if (max
- min
=== Infinity) {
144 throw new RangeError('Invalid interval');
146 return (randomBytes(4).readUInt32LE() / 0xffffffff) * (max
- min
) + min
;
149 export const getRandomInteger
= (max
= Constants
.MAX_RANDOM_INTEGER
, min
= 0): number => {
150 max
= Math.floor(max
);
151 if (!isNullOrUndefined(min
) && min
!== 0) {
152 min
= Math.ceil(min
);
153 return Math.floor(randomInt(min
, max
+ 1));
155 return Math.floor(randomInt(max
+ 1));
159 * Rounds the given number to the given scale.
160 * The rounding is done using the "round half away from zero" method.
162 * @param numberValue - The number to round.
163 * @param scale - The scale to round to.
164 * @returns The rounded number.
166 export const roundTo
= (numberValue
: number, scale
: number): number => {
167 const roundPower
= Math.pow(10, scale
);
168 return Math.round(numberValue
* roundPower
* (1 + Number.EPSILON
)) / roundPower
;
171 export const getRandomFloatRounded
= (max
= Number.MAX_VALUE
, min
= 0, scale
= 2): number => {
173 return roundTo(getRandomFloat(max
, min
), scale
);
175 return roundTo(getRandomFloat(max
), scale
);
178 export const getRandomFloatFluctuatedRounded
= (
180 fluctuationPercent
: number,
183 if (fluctuationPercent
< 0 || fluctuationPercent
> 100) {
184 throw new RangeError(
185 `Fluctuation percent must be between 0 and 100. Actual value: ${fluctuationPercent}`,
188 if (fluctuationPercent
=== 0) {
189 return roundTo(staticValue
, scale
);
191 const fluctuationRatio
= fluctuationPercent
/ 100;
192 return getRandomFloatRounded(
193 staticValue
* (1 + fluctuationRatio
),
194 staticValue
* (1 - fluctuationRatio
),
199 export const extractTimeSeriesValues
= (timeSeries
: Array<TimestampedData
>): number[] => {
200 return timeSeries
.map((timeSeriesItem
) => timeSeriesItem
.value
);
203 export const isObject
= (item
: unknown
): boolean => {
205 isNullOrUndefined(item
) === false && typeof item
=== 'object' && Array.isArray(item
) === false
217 | { [key
: string]: CloneableData
};
219 export const cloneObject
= <T
>(object
: T
): T
=> {
220 // eslint-disable-next-line @typescript-eslint/no-unsafe-call
221 return deepClone(object
as CloneableData
) as T
;
224 export const hasOwnProp
= (object
: unknown
, property
: PropertyKey
): boolean => {
225 return isObject(object
) && Object.hasOwn(object
as object
, property
);
228 export const isCFEnvironment
= (): boolean => {
229 return !isNullOrUndefined(process
.env
.VCAP_APPLICATION
);
232 export const isIterable
= <T
>(obj
: T
): boolean => {
233 return !isNullOrUndefined(obj
) ? typeof obj
[Symbol
.iterator
as keyof T
] === 'function' : false;
236 const isString
= (value
: unknown
): boolean => {
237 return typeof value
=== 'string';
240 export const isEmptyString
= (value
: unknown
): boolean => {
241 return isNullOrUndefined(value
) || (isString(value
) && (value
as string).trim().length
=== 0);
244 export const isNotEmptyString
= (value
: unknown
): boolean => {
245 return isString(value
) && (value
as string).trim().length
> 0;
248 export const isUndefined
= (value
: unknown
): boolean => {
249 return value
=== undefined;
252 export const isNullOrUndefined
= (value
: unknown
): boolean => {
253 // eslint-disable-next-line eqeqeq, no-eq-null
254 return value
== null;
257 export const isEmptyArray
= (object
: unknown
): boolean => {
258 return Array.isArray(object
) && object
.length
=== 0;
261 export const isNotEmptyArray
= (object
: unknown
): boolean => {
262 return Array.isArray(object
) && object
.length
> 0;
265 export const isEmptyObject
= (obj
: object
): boolean => {
266 if (obj
?.constructor
!== Object) {
269 // Iterates over the keys of an object, if
270 // any exist, return false.
271 for (const _
in obj
) {
277 export const insertAt
= (str
: string, subStr
: string, pos
: number): string =>
278 `${str.slice(0, pos)}${subStr}${str.slice(pos)}`;
281 * Computes the retry delay in milliseconds using an exponential backoff algorithm.
283 * @param retryNumber - the number of retries that have already been attempted
284 * @param maxDelayRatio - the maximum ratio of the delay that can be randomized
285 * @returns delay in milliseconds
287 export const exponentialDelay
= (retryNumber
= 0, maxDelayRatio
= 0.2): number => {
288 const delay
= Math.pow(2, retryNumber
) * 100;
289 const randomSum
= delay
* maxDelayRatio
* secureRandom(); // 0-(maxDelayRatio*100)% of the delay
290 return delay
+ randomSum
;
293 const isPromisePending
= (promise
: Promise
<unknown
>): boolean => {
294 return inspect(promise
).includes('pending');
297 export const promiseWithTimeout
= async <T
>(
301 timeoutCallback
: () => void = () => {
302 /* This is intentional */
305 // Create a timeout promise that rejects in timeout milliseconds
306 const timeoutPromise
= new Promise
<never>((_
, reject
) => {
308 if (isPromisePending(promise
)) {
310 // FIXME: The original promise shall be canceled
312 reject(timeoutError
);
316 // Returns a race between timeout promise and the passed promise
317 return Promise
.race
<T
>([promise
, timeoutPromise
]);
321 * Generates a cryptographically secure random number in the [0,1[ range
325 export const secureRandom
= (): number => {
326 return randomBytes(4).readUInt32LE() / 0x100000000;
329 export const JSONStringifyWithMapSupport
= (
330 obj
: Record
<string, unknown
> | Record
<string, unknown
>[] | Map
<unknown
, unknown
>,
333 return JSON
.stringify(
335 (_
, value
: Record
<string, unknown
>) => {
336 if (value
instanceof Map
) {
349 * Converts websocket error code to human readable string message
351 * @param code - websocket error code
352 * @returns human readable string message
354 export const getWebSocketCloseEventStatusString
= (code
: number): string => {
355 if (code
>= 0 && code
<= 999) {
357 } else if (code
>= 1016) {
359 return '(For WebSocket standard)';
360 } else if (code
<= 2999) {
361 return '(For WebSocket extensions)';
362 } else if (code
<= 3999) {
363 return '(For libraries and frameworks)';
364 } else if (code
<= 4999) {
365 return '(For applications)';
370 WebSocketCloseEventStatusString
[code
as keyof
typeof WebSocketCloseEventStatusString
],
373 return WebSocketCloseEventStatusString
[code
as keyof
typeof WebSocketCloseEventStatusString
];
378 export const isArraySorted
= <T
>(array
: T
[], compareFn
: (a
: T
, b
: T
) => number): boolean => {
379 for (let index
= 0; index
< array
.length
- 1; ++index
) {
380 if (compareFn(array
[index
], array
[index
+ 1]) > 0) {