Commit | Line | Data |
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aa4bf4b2 | 1 | import * as os from 'node:os' |
98446b39 | 2 | import { webcrypto } from 'node:crypto' |
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3 | import { Worker as ClusterWorker } from 'node:cluster' |
4 | import { Worker as ThreadWorker } from 'node:worker_threads' | |
3c93feb9 JB |
5 | import type { |
6 | MeasurementStatisticsRequirements, | |
7 | WorkerChoiceStrategyOptions | |
8 | } from './pools/selection-strategies/selection-strategies-types' | |
59317253 | 9 | import type { KillBehavior } from './worker/worker-options' |
75de9f41 JB |
10 | import { |
11 | type IWorker, | |
12 | type MeasurementStatistics, | |
13 | type WorkerType, | |
14 | WorkerTypes | |
15 | } from './pools/worker' | |
bbeadd16 | 16 | |
ff128cc9 JB |
17 | /** |
18 | * Default task name. | |
19 | */ | |
20 | export const DEFAULT_TASK_NAME = 'default' | |
21 | ||
6e9d10db JB |
22 | /** |
23 | * An intentional empty function. | |
24 | */ | |
4f3c3d89 | 25 | export const EMPTY_FUNCTION: () => void = Object.freeze(() => { |
6e9d10db | 26 | /* Intentionally empty */ |
4f3c3d89 | 27 | }) |
78099a15 JB |
28 | |
29 | /** | |
bbeadd16 JB |
30 | * Default worker choice strategy options. |
31 | */ | |
32 | export const DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS: WorkerChoiceStrategyOptions = | |
33 | { | |
8c0b113f | 34 | retries: 6, |
932fc8be | 35 | runTime: { median: false }, |
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36 | waitTime: { median: false }, |
37 | elu: { median: false } | |
bbeadd16 JB |
38 | } |
39 | ||
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40 | /** |
41 | * Default measurement statistics requirements. | |
42 | */ | |
43 | export const DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS: MeasurementStatisticsRequirements = | |
44 | { | |
45 | aggregate: false, | |
46 | average: false, | |
47 | median: false | |
48 | } | |
49 | ||
51474716 | 50 | /** |
ab80dc46 JB |
51 | * Returns safe host OS optimized estimate of the default amount of parallelism a pool should use. |
52 | * Always returns a value greater than zero. | |
53 | * | |
54 | * @returns The host OS optimized maximum pool size. | |
4bffc062 | 55 | * @internal |
51474716 JB |
56 | */ |
57 | export const availableParallelism = (): number => { | |
58 | let availableParallelism = 1 | |
59 | try { | |
aa4bf4b2 | 60 | availableParallelism = os.availableParallelism() |
51474716 | 61 | } catch { |
562a4037 JB |
62 | const cpus = os.cpus() |
63 | if (Array.isArray(cpus) && cpus.length > 0) { | |
64 | availableParallelism = cpus.length | |
51474716 JB |
65 | } |
66 | } | |
67 | return availableParallelism | |
68 | } | |
69 | ||
9fe8fd69 JB |
70 | /** |
71 | * Returns the worker type of the given worker. | |
72 | * | |
73 | * @param worker - The worker to get the type of. | |
74 | * @returns The worker type of the given worker. | |
75 | * @internal | |
76 | */ | |
187601ff | 77 | export const getWorkerType = (worker: IWorker): WorkerType | undefined => { |
9fe8fd69 JB |
78 | if (worker instanceof ThreadWorker) { |
79 | return WorkerTypes.thread | |
80 | } else if (worker instanceof ClusterWorker) { | |
81 | return WorkerTypes.cluster | |
82 | } | |
83 | } | |
84 | ||
85 | /** | |
86 | * Returns the worker id of the given worker. | |
87 | * | |
88 | * @param worker - The worker to get the id of. | |
89 | * @returns The worker id of the given worker. | |
90 | * @internal | |
91 | */ | |
187601ff | 92 | export const getWorkerId = (worker: IWorker): number | undefined => { |
9fe8fd69 JB |
93 | if (worker instanceof ThreadWorker) { |
94 | return worker.threadId | |
95 | } else if (worker instanceof ClusterWorker) { | |
96 | return worker.id | |
97 | } | |
98 | } | |
99 | ||
68cbdc84 JB |
100 | /** |
101 | * Sleeps for the given amount of milliseconds. | |
102 | * | |
103 | * @param ms - The amount of milliseconds to sleep. | |
104 | * @returns A promise that resolves after the given amount of milliseconds. | |
105 | */ | |
106 | export const sleep = async (ms: number): Promise<void> => { | |
107 | await new Promise((resolve) => { | |
108 | setTimeout(resolve, ms) | |
109 | }) | |
110 | } | |
111 | ||
112 | /** | |
113 | * Computes the retry delay in milliseconds using an exponential back off algorithm. | |
114 | * | |
115 | * @param retryNumber - The number of retries that have already been attempted | |
147be6fe | 116 | * @param delayFactor - The base delay factor in milliseconds |
68cbdc84 JB |
117 | * @returns Delay in milliseconds |
118 | * @internal | |
119 | */ | |
120 | export const exponentialDelay = ( | |
121 | retryNumber = 0, | |
147be6fe | 122 | delayFactor = 100 |
68cbdc84 | 123 | ): number => { |
147be6fe JB |
124 | const delay = Math.pow(2, retryNumber) * delayFactor |
125 | const randomSum = delay * 0.2 * secureRandom() // 0-20% of the delay | |
68cbdc84 JB |
126 | return delay + randomSum |
127 | } | |
8990357d | 128 | |
dc021bcc JB |
129 | /** |
130 | * Computes the average of the given data set. | |
131 | * | |
132 | * @param dataSet - Data set. | |
133 | * @returns The average of the given data set. | |
134 | * @internal | |
135 | */ | |
136 | export const average = (dataSet: number[]): number => { | |
137 | if (Array.isArray(dataSet) && dataSet.length === 0) { | |
138 | return 0 | |
139 | } | |
140 | if (Array.isArray(dataSet) && dataSet.length === 1) { | |
141 | return dataSet[0] | |
142 | } | |
143 | return ( | |
144 | dataSet.reduce((accumulator, number) => accumulator + number, 0) / | |
145 | dataSet.length | |
146 | ) | |
147 | } | |
148 | ||
bbeadd16 | 149 | /** |
afe0d5bf | 150 | * Computes the median of the given data set. |
78099a15 JB |
151 | * |
152 | * @param dataSet - Data set. | |
153 | * @returns The median of the given data set. | |
4bffc062 | 154 | * @internal |
78099a15 JB |
155 | */ |
156 | export const median = (dataSet: number[]): number => { | |
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157 | if (Array.isArray(dataSet) && dataSet.length === 0) { |
158 | return 0 | |
159 | } | |
78099a15 JB |
160 | if (Array.isArray(dataSet) && dataSet.length === 1) { |
161 | return dataSet[0] | |
162 | } | |
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163 | const sortedDataSet = dataSet.slice().sort((a, b) => a - b) |
164 | return ( | |
165 | (sortedDataSet[(sortedDataSet.length - 1) >> 1] + | |
166 | sortedDataSet[sortedDataSet.length >> 1]) / | |
167 | 2 | |
168 | ) | |
78099a15 | 169 | } |
0d80593b | 170 | |
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171 | /** |
172 | * Rounds the given number to the given scale. | |
64383951 | 173 | * The rounding is done using the "round half away from zero" method. |
afe0d5bf JB |
174 | * |
175 | * @param num - The number to round. | |
176 | * @param scale - The scale to round to. | |
177 | * @returns The rounded number. | |
178 | */ | |
179 | export const round = (num: number, scale = 2): number => { | |
180 | const rounder = Math.pow(10, scale) | |
181 | return Math.round(num * rounder * (1 + Number.EPSILON)) / rounder | |
182 | } | |
183 | ||
3c653a03 JB |
184 | /** |
185 | * Is the given object a plain object? | |
186 | * | |
187 | * @param obj - The object to check. | |
188 | * @returns `true` if the given object is a plain object, `false` otherwise. | |
189 | */ | |
0d80593b JB |
190 | export const isPlainObject = (obj: unknown): boolean => |
191 | typeof obj === 'object' && | |
192 | obj !== null && | |
193 | obj?.constructor === Object && | |
194 | Object.prototype.toString.call(obj) === '[object Object]' | |
59317253 JB |
195 | |
196 | /** | |
197 | * Detects whether the given value is a kill behavior or not. | |
198 | * | |
199 | * @typeParam KB - Which specific KillBehavior type to test against. | |
200 | * @param killBehavior - Which kind of kill behavior to detect. | |
201 | * @param value - Any value. | |
202 | * @returns `true` if `value` was strictly equals to `killBehavior`, otherwise `false`. | |
4bffc062 | 203 | * @internal |
59317253 JB |
204 | */ |
205 | export const isKillBehavior = <KB extends KillBehavior>( | |
206 | killBehavior: KB, | |
207 | value: unknown | |
208 | ): value is KB => { | |
209 | return value === killBehavior | |
210 | } | |
49d1b48c JB |
211 | |
212 | /** | |
213 | * Detects whether the given value is an asynchronous function or not. | |
214 | * | |
215 | * @param fn - Any value. | |
216 | * @returns `true` if `fn` was an asynchronous function, otherwise `false`. | |
217 | */ | |
218 | export const isAsyncFunction = ( | |
219 | fn: unknown | |
220 | ): fn is (...args: unknown[]) => Promise<unknown> => { | |
221 | return typeof fn === 'function' && fn.constructor.name === 'AsyncFunction' | |
222 | } | |
e4f20deb JB |
223 | |
224 | /** | |
225 | * Updates the given measurement statistics. | |
226 | * | |
227 | * @param measurementStatistics - The measurement statistics to update. | |
228 | * @param measurementRequirements - The measurement statistics requirements. | |
229 | * @param measurementValue - The measurement value. | |
008512c7 | 230 | * @param numberOfMeasurements - The number of measurements. |
4bffc062 | 231 | * @internal |
e4f20deb JB |
232 | */ |
233 | export const updateMeasurementStatistics = ( | |
234 | measurementStatistics: MeasurementStatistics, | |
235 | measurementRequirements: MeasurementStatisticsRequirements, | |
dc021bcc | 236 | measurementValue: number |
e4f20deb JB |
237 | ): void => { |
238 | if (measurementRequirements.aggregate) { | |
239 | measurementStatistics.aggregate = | |
240 | (measurementStatistics.aggregate ?? 0) + measurementValue | |
241 | measurementStatistics.minimum = Math.min( | |
242 | measurementValue, | |
243 | measurementStatistics.minimum ?? Infinity | |
244 | ) | |
245 | measurementStatistics.maximum = Math.max( | |
246 | measurementValue, | |
247 | measurementStatistics.maximum ?? -Infinity | |
248 | ) | |
dc021bcc JB |
249 | if ( |
250 | (measurementRequirements.average || measurementRequirements.median) && | |
251 | measurementValue != null | |
252 | ) { | |
e4f20deb | 253 | measurementStatistics.history.push(measurementValue) |
dc021bcc JB |
254 | if (measurementRequirements.average) { |
255 | measurementStatistics.average = average(measurementStatistics.history) | |
bdb9d712 JB |
256 | } else if (measurementStatistics.average != null) { |
257 | delete measurementStatistics.average | |
dc021bcc JB |
258 | } |
259 | if (measurementRequirements.median) { | |
260 | measurementStatistics.median = median(measurementStatistics.history) | |
bdb9d712 JB |
261 | } else if (measurementStatistics.median != null) { |
262 | delete measurementStatistics.median | |
dc021bcc | 263 | } |
e4f20deb JB |
264 | } |
265 | } | |
266 | } | |
c3f0a074 | 267 | |
68cbdc84 JB |
268 | /** |
269 | * Generate a cryptographically secure random number in the [0,1[ range | |
270 | * | |
271 | * @returns A number in the [0,1[ range | |
272 | */ | |
970b38d6 | 273 | export const secureRandom = (): number => { |
98446b39 | 274 | return webcrypto.getRandomValues(new Uint32Array(1))[0] / 0x100000000 |
68cbdc84 | 275 | } |