metautil - npm Package Compare versions

Comparing version 3.0.0 to 3.0.1

CHANGELOG.md

@@ -5,2 +5,6 @@ # Changelog
 
+## [3.0.1][] - 2021-01-18
+
+- Optimize buffering crypto random generator
+
 ## [3.0.0][] - 2021-01-06
@@ -16,3 +20,5 @@
 
-[unreleased]: https://github.com/metarhia/metautil/compare/v2.2.0...HEAD
+[unreleased]: https://github.com/metarhia/metautil/compare/v3.0.1...HEAD
+[3.0.1]: https://github.com/metarhia/metautil/compare/v3.0.0...v3.0.1
+[3.0.0]: https://github.com/metarhia/metautil/compare/v2.2.0...v3.0.0
 [2.2.0]: https://github.com/metarhia/common/releases/tag/v2.2.0

metautil.js

@@ -6,37 +6,2 @@ 'use strict';
 
-class CryptoRandomPrefetcher {
-  constructor(bufSize, valueSize) {
-    if (bufSize % valueSize !== 0) {
-      throw new RangeError('buffer size must be a multiple of value size');
-    }
-    this.buf = crypto.randomBytes(bufSize);
-    this.pos = 0;
-    this.vsz = valueSize;
-  }
-
-  // Return Buffer with next `valueSize` random bytes.
-  next() {
-    if (this.pos === this.buf.length) {
-      this.pos = 0;
-      crypto.randomFillSync(this.buf);
-    }
-    const end = this.pos + this.vsz;
-    const buf = this.buf.slice(this.pos, end);
-    this.pos = end;
-    return buf;
-  }
-
-  [Symbol.iterator]() {
-    return {
-      [Symbol.iterator]() {
-        return this;
-      },
-      next: () => ({ value: this.next(), done: false }),
-    };
-  }
-}
-
-const cryptoPrefetcher = (bufSize, valueSize) =>
-  new CryptoRandomPrefetcher(bufSize, valueSize);
-
 const random = (min, max) => {
@@ -50,8 +15,21 @@ if (max === undefined) {
 
-const randPrefetcher = cryptoPrefetcher(4096, 4);
 const UINT32_MAX = 0xffffffff;
+const BUF_LEN = 1024;
+const BUF_SIZE = BUF_LEN * Uint32Array.BYTES_PER_ELEMENT;
 
-const cryptoRandom = () =>
-  randPrefetcher.next().readUInt32LE(0, true) / (UINT32_MAX + 1);
+const randomPrefetcher = {
+  buf: crypto.randomBytes(BUF_SIZE),
+  pos: 0,
+};
 
+const cryptoRandom = () => {
+  if (randomPrefetcher.pos === randomPrefetcher.buf.length) {
+    randomPrefetcher.pos = 0;
+    crypto.randomFillSync(randomPrefetcher.buf);
+  }
+  const val = randomPrefetcher.buf.readUInt32LE(randomPrefetcher.pos);
+  randomPrefetcher.pos += Uint32Array.BYTES_PER_ELEMENT;
+  return val / (UINT32_MAX + 1);
+};
+
 const sample = (arr) => {
@@ -58,0 +36,0 @@ const index = Math.floor(Math.random() * arr.length);

package.json

 {
   "name": "metautil",
-  "version": "3.0.0",
+  "version": "3.0.1",
   "author": "Timur Shemsedinov <[e-mail]>",
@@ -17,3 +17,2 @@ "license": "MIT",
   },
-  "homepage": "https://github.com/metarhia/metautil#readme",
   "repository": {
@@ -24,4 +23,10 @@ "type": "git",
   "bugs": {
-    "url": "https://github.com/metarhia/metautil/issues"
+    "url": "https://github.com/metarhia/metautil/issues",
+    "email": "[e-mail]"
   },
+  "homepage": "https://metarhia.com",
+  "funding": {
+    "type": "patreon",
+    "url": "https://www.patreon.com/tshemsedinov"
+  },
   "scripts": {
@@ -33,3 +38,3 @@ "lint": "eslint . && prettier --check \"**/*.js\" \"**/*.json\" \"**/*.md\" \"**/.*rc\"",
   "devDependencies": {
-    "eslint": "^7.15.0",
+    "eslint": "^7.18.0",
     "eslint-config-metarhia": "^7.0.1",
@@ -36,0 +41,0 @@ "eslint-config-prettier": "^7.0.0",

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Found 1 instance in 1 package

Fixed alerts

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Worsened metrics

Total package byte prevSize

7611

decreased by-2.07%

Lines of code

145

decreased by-11.59%

No dependency changes