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[benchmarks-js.git] / benchmark-utils.js

diff --git a/benchmark-utils.js b/benchmark-utils.js
index 4cddc6d5fe5defe31cf6ba306e87853f68b1573c..678a2b3b80ae28a7367ade71a1993ee77b45d640 100644 (file)
--- a/benchmark-utils.js
+++ b/benchmark-utils.js
@@ -1,8 +1,75 @@
-function generateRandomInteger (max, min = 0) {
-  if (min) {
-    return Math.floor(Math.random() * (max - min + 1) + min)
+const crypto = require('crypto')
+
+/**
+ * Generate a cryptographically secure random number in the [0,1[ range
+ *
+ * @returns
+ */
+function secureRandom () {
+  return crypto.randomBytes(4).readUInt32LE() / 0x100000000
+}
+
+/**
+ * @param max
+ * @param min
+ * @returns
+ */
+function generateRandomInteger (max = Number.MAX_SAFE_INTEGER, min = 0) {
+  if (max < 0) {
+    throw new RangeError('Invalid interval')
+  }
+  max = Math.floor(max)
+  if (min != null && min !== 0) {
+    if (max < min || min < 0) {
+      throw new RangeError('Invalid interval')
+    }
+    min = Math.ceil(min)
+    return Math.floor(secureRandom() * (max - min + 1)) + min
+  }
+  return Math.floor(secureRandom() * (max + 1))
+}
+
+/**
+ *
+ * @param size
+ * @param max
+ * @param numberGenerator
+ * @returns
+ */
+function generateRandomNumberArray (
+  size,
+  max = Number.MAX_VALUE,
+  numberGenerator = generateRandomFloat
+) {
+  const array = []
+  for (let i = 0; i < size; i++) {
+    array.push(numberGenerator(max))
   }
-  return Math.floor(Math.random() * max + 1)
+  return array
+}
+
+/**
+ *
+ * @param max
+ * @param min
+ * @param negative
+ * @returns
+ */
+function generateRandomFloat (max = Number.MAX_VALUE, min = 0, negative = true) {
+  if (max < min || min < 0 || max < 0) {
+    throw new RangeError('Invalid interval')
+  }
+  const randomPositiveFloat = crypto.randomBytes(4).readUInt32LE() / 0xffffffff
+  const sign = negative && randomPositiveFloat < 0.5 ? -1 : 1
+  return sign * (randomPositiveFloat * (max - min) + min)
+}
+
+/**
+ * @param ms
+ * @returns
+ */
+async function sleep (ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
 }
 
 const LIST_FORMATTER = new Intl.ListFormat('en-US', {
@@ -10,4 +77,11 @@ const LIST_FORMATTER = new Intl.ListFormat('en-US', {
   type: 'conjunction'
 })
 
-module.exports = { generateRandomInteger, LIST_FORMATTER }
+module.exports = {
+  generateRandomInteger,
+  generateRandomFloat,
+  generateRandomNumberArray,
+  sleep,
+  secureRandom,
+  LIST_FORMATTER
+}