refactor: renable standard JS linter rules

[poolifier.git] / src / utils.ts

diff --git a/src/utils.ts b/src/utils.ts
index d7ce5a210f2dea09290fd90a5f4eb64fcb2162d5..7d6309d539e22e65b08b64b55924b6df8a51de74 100644 (file)
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,13 +1,14 @@
 import * as os from 'node:os'
-import { webcrypto } from 'node:crypto'
+import { getRandomValues, randomInt } from 'node:crypto'
 import { Worker as ClusterWorker } from 'node:cluster'
 import { Worker as ThreadWorker } from 'node:worker_threads'
+import { cpus } from 'node:os'
 import type {
-  MeasurementStatisticsRequirements,
-  WorkerChoiceStrategyOptions
-} from './pools/selection-strategies/selection-strategies-types'
-import type { KillBehavior } from './worker/worker-options'
-import { type IWorker, type WorkerType, WorkerTypes } from './pools/worker'
+  InternalWorkerChoiceStrategyOptions,
+  MeasurementStatisticsRequirements
+} from './pools/selection-strategies/selection-strategies-types.js'
+import type { KillBehavior } from './worker/worker-options.js'
+import { type IWorker, type WorkerType, WorkerTypes } from './pools/worker.js'
 
 /**
  * Default task name.
@@ -22,15 +23,21 @@ export const EMPTY_FUNCTION: () => void = Object.freeze(() => {
 })
 
 /**
- * Default worker choice strategy options.
+ * Gets default worker choice strategy options.
+ *
+ * @param retries - The number of worker choice retries.
+ * @returns The default worker choice strategy options.
  */
-export const DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS: WorkerChoiceStrategyOptions =
-  {
-    retries: 6,
+const getDefaultInternalWorkerChoiceStrategyOptions = (
+  retries: number
+): InternalWorkerChoiceStrategyOptions => {
+  return {
+    retries,
     runTime: { median: false },
     waitTime: { median: false },
     elu: { median: false }
   }
+}
 
 /**
  * Default measurement statistics requirements.
@@ -226,7 +233,7 @@ export const isAsyncFunction = (
  * @internal
  */
 export const secureRandom = (): number => {
-  return webcrypto.getRandomValues(new Uint32Array(1))[0] / 0x100000000
+  return getRandomValues(new Uint32Array(1))[0] / 0x100000000
 }
 
 /**
@@ -250,3 +257,76 @@ export const min = (...args: number[]): number =>
  */
 export const max = (...args: number[]): number =>
   args.reduce((maximum, num) => (maximum > num ? maximum : num), -Infinity)
+
+/**
+ * Wraps a function so that it can only be called once.
+ *
+ * @param fn - The function to wrap.
+ * @param context - The context to bind the function to.
+ * @returns The wrapped function.
+ * @internal
+ */
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export const once = <T, A extends any[], R>(
+  fn: (...args: A) => R,
+  context: T
+): ((...args: A) => R) => {
+  let result: R
+  return (...args: A) => {
+    if (fn != null) {
+      result = fn.apply<T, A, R>(context, args)
+      ;(fn as unknown as undefined) = (context as unknown as undefined) =
+        undefined
+    }
+    return result
+  }
+}
+
+const clone = <T extends object>(object: T): T => {
+  return JSON.parse(JSON.stringify(object)) as T
+}
+
+export const buildInternalWorkerChoiceStrategyOptions = (
+  poolMaxSize: number,
+  opts?: InternalWorkerChoiceStrategyOptions
+): InternalWorkerChoiceStrategyOptions => {
+  opts = clone(opts ?? {})
+  if (opts?.weights == null) {
+    opts.weights = getDefaultWeights(poolMaxSize)
+  }
+  return {
+    ...getDefaultInternalWorkerChoiceStrategyOptions(
+      poolMaxSize + Object.keys(opts.weights).length
+    ),
+    ...opts
+  }
+}
+
+const getDefaultWeights = (
+  poolMaxSize: number,
+  defaultWorkerWeight?: number
+): Record<number, number> => {
+  defaultWorkerWeight = defaultWorkerWeight ?? getDefaultWorkerWeight()
+  const weights: Record<number, number> = {}
+  for (let workerNodeKey = 0; workerNodeKey < poolMaxSize; workerNodeKey++) {
+    weights[workerNodeKey] = defaultWorkerWeight
+  }
+  return weights
+}
+
+const getDefaultWorkerWeight = (): number => {
+  const cpuSpeed = randomInt(500, 2500)
+  let cpusCycleTimeWeight = 0
+  for (const cpu of cpus()) {
+    if (cpu.speed == null || cpu.speed === 0) {
+      cpu.speed =
+        cpus().find(cpu => cpu.speed != null && cpu.speed !== 0)?.speed ??
+        cpuSpeed
+    }
+    // CPU estimated cycle time
+    const numberOfDigits = cpu.speed.toString().length - 1
+    const cpuCycleTime = 1 / (cpu.speed / Math.pow(10, numberOfDigits))
+    cpusCycleTimeWeight += cpuCycleTime * Math.pow(10, numberOfDigits)
+  }
+  return Math.round(cpusCycleTimeWeight / cpus().length)
+}