X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Futils.ts;h=e1d6c11859936dfef95d5e4777e509ca50df5f0f;hb=b4c2a50df77a5f3110d228436ce9f3008cbd8297;hp=d39bfa02c8498ed54d8bebc8d9ace5a7a7fd756f;hpb=dc021bcca72f8b4d185d96a301579612fba2793b;p=poolifier.git

diff --git a/src/utils.ts b/src/utils.ts
index d39bfa02..e1d6c118 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 }
@@ -51,30 +59,76 @@ export const availableParallelism = (): number => {
   try {
     availableParallelism = os.availableParallelism()
   } catch {
-    const numberOfCpus = os.cpus()
-    if (Array.isArray(numberOfCpus) && numberOfCpus.length > 0) {
-      availableParallelism = numberOfCpus.length
+    const cpus = os.cpus()
+    if (Array.isArray(cpus) && cpus.length > 0) {
+      availableParallelism = cpus.length
     }
   }
   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
-//  * @internal
-//  */
-// 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.
@@ -203,34 +257,23 @@ export const updateMeasurementStatistics = (
       measurementStatistics.history.push(measurementValue)
       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
       }
     }
   }
 }
 
 /**
- * Executes a function once at a time.
+ * Generate a cryptographically secure random number in the [0,1[ range
  *
- * @param fn - The function to execute.
- * @param context - The context to bind the function to.
- * @returns The function to execute.
- */
-export const once = (
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  fn: (...args: any[]) => void,
-  context: unknown
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-): ((...args: any[]) => void) => {
-  let called = false
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  return function (...args: any[]): void {
-    if (!called) {
-      called = true
-      fn.apply(context, args)
-      called = false
-    }
-  }
+ * @returns A number in the [0,1[ range
+ */
+export const secureRandom = (): number => {
+  return webcrypto.getRandomValues(new Uint32Array(1))[0] / 0x100000000
 }