X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Futils.ts;h=82c38c09e7161fd06e2c6f1628fdaad1e8f4c63f;hb=4f37eb675971d5e79730442f189d3cd02ed61155;hp=efd1f124084776667bd60495f202cec32c7e04a9;hpb=c38a523624d95c0329fac3d0748883c361db9d93;p=poolifier.git

diff --git a/src/utils.ts b/src/utils.ts
index efd1f124..82c38c09 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,10 +1,18 @@
 import * as os from 'node:os'
+import { webcrypto } from 'node:crypto'
+import { Worker as ClusterWorker } from 'node:cluster'
+import { Worker as ThreadWorker } from 'node:worker_threads'
 import type {
   MeasurementStatisticsRequirements,
   WorkerChoiceStrategyOptions
 } from './pools/selection-strategies/selection-strategies-types'
 import type { KillBehavior } from './worker/worker-options'
-import type { MeasurementStatistics } from './pools/worker'
+import {
+  type IWorker,
+  type MeasurementStatistics,
+  type WorkerType,
+  WorkerTypes
+} from './pools/worker'
 
 /**
  * Default task name.
@@ -23,7 +31,7 @@ export const EMPTY_FUNCTION: () => void = Object.freeze(() => {
  */
 export const DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS: WorkerChoiceStrategyOptions =
   {
-    choiceRetries: 6,
+    retries: 6,
     runTime: { median: false },
     waitTime: { median: false },
     elu: { median: false }
@@ -44,6 +52,7 @@ export const DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS: MeasurementStatisticsR
  * Always returns a value greater than zero.
  *
  * @returns The host OS optimized maximum pool size.
+ * @internal
  */
 export const availableParallelism = (): number => {
   let availableParallelism = 1
@@ -58,27 +67,95 @@ export const availableParallelism = (): number => {
   return availableParallelism
 }
 
-// /**
-//  * Computes the retry delay in milliseconds using an exponential back off algorithm.
-//  *
-//  * @param retryNumber - The number of retries that have already been attempted
-//  * @param maxDelayRatio - The maximum ratio of the delay that can be randomized
-//  * @returns Delay in milliseconds
-//  */
-// export const exponentialDelay = (
-//   retryNumber = 0,
-//   maxDelayRatio = 0.2
-// ): number => {
-//   const delay = Math.pow(2, retryNumber) * 100
-//   const randomSum = delay * maxDelayRatio * Math.random() // 0-(maxDelayRatio*100)% of the delay
-//   return delay + randomSum
-// }
+/**
+ * Returns the worker type of the given worker.
+ *
+ * @param worker - The worker to get the type of.
+ * @returns The worker type of the given worker.
+ * @internal
+ */
+export const getWorkerType = <Worker extends IWorker>(
+  worker: Worker
+): WorkerType | undefined => {
+  if (worker instanceof ThreadWorker) {
+    return WorkerTypes.thread
+  } else if (worker instanceof ClusterWorker) {
+    return WorkerTypes.cluster
+  }
+}
+
+/**
+ * Returns the worker id of the given worker.
+ *
+ * @param worker - The worker to get the id of.
+ * @returns The worker id of the given worker.
+ * @internal
+ */
+export const getWorkerId = <Worker extends IWorker>(
+  worker: Worker
+): number | undefined => {
+  if (worker instanceof ThreadWorker) {
+    return worker.threadId
+  } else if (worker instanceof ClusterWorker) {
+    return worker.id
+  }
+}
+
+/**
+ * Sleeps for the given amount of milliseconds.
+ *
+ * @param ms - The amount of milliseconds to sleep.
+ * @returns A promise that resolves after the given amount of milliseconds.
+ */
+export const sleep = async (ms: number): Promise<void> => {
+  await new Promise((resolve) => {
+    setTimeout(resolve, ms)
+  })
+}
+
+/**
+ * Computes the retry delay in milliseconds using an exponential back off algorithm.
+ *
+ * @param retryNumber - The number of retries that have already been attempted
+ * @param delayFactor - The base delay factor in milliseconds
+ * @returns Delay in milliseconds
+ * @internal
+ */
+export const exponentialDelay = (
+  retryNumber = 0,
+  delayFactor = 100
+): number => {
+  const delay = Math.pow(2, retryNumber) * delayFactor
+  const randomSum = delay * 0.2 * secureRandom() // 0-20% of the delay
+  return delay + randomSum
+}
+
+/**
+ * Computes the average of the given data set.
+ *
+ * @param dataSet - Data set.
+ * @returns The average of the given data set.
+ * @internal
+ */
+export const average = (dataSet: number[]): number => {
+  if (Array.isArray(dataSet) && dataSet.length === 0) {
+    return 0
+  }
+  if (Array.isArray(dataSet) && dataSet.length === 1) {
+    return dataSet[0]
+  }
+  return (
+    dataSet.reduce((accumulator, number) => accumulator + number, 0) /
+    dataSet.length
+  )
+}
 
 /**
  * Computes the median of the given data set.
  *
  * @param dataSet - Data set.
  * @returns The median of the given data set.
+ * @internal
  */
 export const median = (dataSet: number[]): number => {
   if (Array.isArray(dataSet) && dataSet.length === 0) {
@@ -127,6 +204,7 @@ export const isPlainObject = (obj: unknown): boolean =>
  * @param killBehavior - Which kind of kill behavior to detect.
  * @param value - Any value.
  * @returns `true` if `value` was strictly equals to `killBehavior`, otherwise `false`.
+ * @internal
  */
 export const isKillBehavior = <KB extends KillBehavior>(
   killBehavior: KB,
@@ -154,12 +232,12 @@ export const isAsyncFunction = (
  * @param measurementRequirements - The measurement statistics requirements.
  * @param measurementValue - The measurement value.
  * @param numberOfMeasurements - The number of measurements.
+ * @internal
  */
 export const updateMeasurementStatistics = (
   measurementStatistics: MeasurementStatistics,
   measurementRequirements: MeasurementStatisticsRequirements,
-  measurementValue: number,
-  numberOfMeasurements: number
+  measurementValue: number
 ): void => {
   if (measurementRequirements.aggregate) {
     measurementStatistics.aggregate =
@@ -172,13 +250,30 @@ export const updateMeasurementStatistics = (
       measurementValue,
       measurementStatistics.maximum ?? -Infinity
     )
-    if (measurementRequirements.average && numberOfMeasurements !== 0) {
-      measurementStatistics.average =
-        measurementStatistics.aggregate / numberOfMeasurements
-    }
-    if (measurementRequirements.median && measurementValue != null) {
+    if (
+      (measurementRequirements.average || measurementRequirements.median) &&
+      measurementValue != null
+    ) {
       measurementStatistics.history.push(measurementValue)
-      measurementStatistics.median = median(measurementStatistics.history)
+      if (measurementRequirements.average) {
+        measurementStatistics.average = average(measurementStatistics.history)
+      } else if (measurementStatistics.average != null) {
+        delete measurementStatistics.average
+      }
+      if (measurementRequirements.median) {
+        measurementStatistics.median = median(measurementStatistics.history)
+      } else if (measurementStatistics.median != null) {
+        delete measurementStatistics.median
+      }
     }
   }
 }
+
+/**
+ * Generate a cryptographically secure random number in the [0,1[ range
+ *
+ * @returns A number in the [0,1[ range
+ */
+export const secureRandom = (): number => {
+  return webcrypto.getRandomValues(new Uint32Array(1))[0] / 0x100000000
+}