websocket: improve performance of generate mask

benchmarks/websocket/generate-mask.mjs

@@ -0,0 +1,22 @@
+import { randomFillSync, randomBytes } from 'node:crypto'
+import { bench, group, run } from 'mitata'
+
+const BUFFER_SIZE = 16384
+
+const buf = randomFillSync(Buffer.allocUnsafe(BUFFER_SIZE), 0, BUFFER_SIZE)
+let bufIdx = 0
+
+function generateMask () {
+  if (bufIdx + 4 > BUFFER_SIZE) {
+    bufIdx = 0
+    randomFillSync(buf, 0, BUFFER_SIZE)
+  }
+  return [buf[bufIdx++], buf[bufIdx++], buf[bufIdx++], buf[bufIdx++]]
+}
+
+group('generate', () => {
+  bench('generateMask', () => generateMask())
+  bench('crypto.randomBytes(4)', () => randomBytes(4))
+})
+
+await run()

lib/web/websocket/websocket.js

@@ -2,7 +2,7 @@
 
 const { webidl } = require('../fetch/webidl')
 const { URLSerializer } = require('../fetch/data-url')
-const { getGlobalOrigin } = require('../fetch/global')
+const { environmentSettingsObject } = require('../fetch/util')
 const { staticPropertyDescriptors, states, sentCloseFrameState, opcodes, emptyBuffer } = require('./constants')
 const {
   kWebSocketURL,
@@ -29,6 +29,8 @@ const { kEnumerableProperty, isBlobLike } = require('../../core/util')
 const { getGlobalDispatcher } = require('../../global')
 const { types } = require('node:util')
 
+const FastBuffer = Buffer[Symbol.species]
+
 let experimentalWarned = false
 
 // https://websockets.spec.whatwg.org/#interface-definition
@@ -67,7 +69,7 @@ class WebSocket extends EventTarget {
     protocols = options.protocols
 
     // 1. Let baseURL be this's relevant settings object's API base URL.
-    const baseURL = getGlobalOrigin()
+    const baseURL = environmentSettingsObject.settingsObject.baseUrl
 
     // 1. Let urlRecord be the result of applying the URL parser to url with baseURL.
     let urlRecord
@@ -323,7 +325,7 @@ class WebSocket extends EventTarget {
       // increase the bufferedAmount attribute by the length of the
       // ArrayBuffer in bytes.
 
-      const value = Buffer.from(data)
+      const value = new FastBuffer(data)
       const frame = new WebsocketFrameSend(value)
       const buffer = frame.createFrame(opcodes.BINARY)
 
@@ -344,7 +346,7 @@ class WebSocket extends EventTarget {
       // not throw an exception must increase the bufferedAmount attribute
       // by the length of data’s buffer in bytes.
 
-      const ab = Buffer.from(data, data.byteOffset, data.byteLength)
+      const ab = new FastBuffer(data, data.byteOffset, data.byteLength)
 
       const frame = new WebsocketFrameSend(ab)
       const buffer = frame.createFrame(opcodes.BINARY)
@@ -368,7 +370,7 @@ class WebSocket extends EventTarget {
       const frame = new WebsocketFrameSend()
 
       data.arrayBuffer().then((ab) => {
-        const value = Buffer.from(ab)
+        const value = new FastBuffer(ab)
         frame.frameData = value
         const buffer = frame.createFrame(opcodes.BINARY)
 
@@ -505,9 +507,7 @@ class WebSocket extends EventTarget {
   set binaryType (type) {
     webidl.brandCheck(this, WebSocket)
 
-    if (type !== 'blob' && type !== 'arraybuffer') {
-      this[kBinaryType] = 'blob'
-    } else {
+    if (type === 'blob' || type === 'arraybuffer') {
       this[kBinaryType] = type
     }
   }
@@ -644,7 +644,10 @@ webidl.converters.WebSocketSendData = function (V) {
     }
   }
 
-  return webidl.converters.USVString(V)
+  // This is done with `Buffer.from`.
+  // "To convert a string into a scalar value string, replace any surrogates
+  //  with U+FFFD."
+  return webidl.converters.DOMString(V)
 }
 
 module.exports = {