Merge dependabot/npm_and_yarn/examples/typescript/http-server-pool/express-cluster...

[poolifier.git] / src / utils.ts

diff --git a/src/utils.ts b/src/utils.ts
index a0a9e530131cbe78df7401dff80452eef16e8634..b38cf948e833ef41ccc7d183db0498a8e4257ed0 100644 (file)
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,13 +1,15 @@
 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'
+} 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'
+import type { IPool } from './pools/pool.js'
 
 /**
  * Default task name.
@@ -21,17 +23,6 @@ export const EMPTY_FUNCTION: () => void = Object.freeze(() => {
   /* Intentionally empty */
 })
 
-/**
- * Default worker choice strategy options.
- */
-export const DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS: WorkerChoiceStrategyOptions =
-  {
-    retries: 6,
-    runTime: { median: false },
-    waitTime: { median: false },
-    elu: { median: false }
-  }
-
 /**
  * Default measurement statistics requirements.
  */
@@ -187,7 +178,7 @@ export const round = (num: number, scale = 2): number => {
 export const isPlainObject = (obj: unknown): boolean =>
   typeof obj === 'object' &&
   obj !== null &&
-  obj?.constructor === Object &&
+  obj.constructor === Object &&
   Object.prototype.toString.call(obj) === '[object Object]'
 
 /**
@@ -226,7 +217,7 @@ export const isAsyncFunction = (
  * @internal
  */
 export const secureRandom = (): number => {
-  return webcrypto.getRandomValues(new Uint32Array(1))[0] / 0x100000000
+  return getRandomValues(new Uint32Array(1))[0] / 0x100000000
 }
 
 /**
@@ -266,6 +257,7 @@ export const once = <T, A extends any[], R>(
 ): ((...args: A) => R) => {
   let result: R
   return (...args: A) => {
+    // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
     if (fn != null) {
       result = fn.apply<T, A, R>(context, args)
       ;(fn as unknown as undefined) = (context as unknown as undefined) =
@@ -274,3 +266,72 @@ export const once = <T, A extends any[], R>(
     return result
   }
 }
+
+export const getWorkerChoiceStrategyRetries = <
+  Worker extends IWorker,
+  Data,
+  Response
+>(
+    pool: IPool<Worker, Data, Response>,
+    opts?: WorkerChoiceStrategyOptions
+  ): number => {
+  return (
+    pool.info.maxSize +
+    Object.keys(opts?.weights ?? getDefaultWeights(pool.info.maxSize)).length
+  )
+}
+
+const clone = <T>(object: T): T => {
+  return structuredClone<T>(object)
+}
+
+export const buildWorkerChoiceStrategyOptions = <
+  Worker extends IWorker,
+  Data,
+  Response
+>(
+    pool: IPool<Worker, Data, Response>,
+    opts?: WorkerChoiceStrategyOptions
+  ): WorkerChoiceStrategyOptions => {
+  opts = clone(opts ?? {})
+  opts.weights = opts.weights ?? getDefaultWeights(pool.info.maxSize)
+  return {
+    ...{
+      runTime: { median: false },
+      waitTime: { median: false },
+      elu: { median: false }
+    },
+    ...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()) {
+    // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+    if (cpu.speed == null || cpu.speed === 0) {
+      cpu.speed =
+        // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+        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)
+}