Ethan-Arrowood

Module 1 - Introduction to WebSockets

Resources:

• MDN - The WebSockets API
• RFC 6455 - The WebSocket Protocol

Lesson 1 - Upgrading HTTP

This lesson will discuss the natural progression from HTTP to WebSockets. It should cover topics such as the Upgrade header, the client/server handshake, transfer of data, and connection persistance. All of these concepts and more are covered in the MDN documentation. Security should also be covered in this lesson

Ethan-Arrowood

const { Machine, interpret, send, sendParent } = require("xstate");
const https = require('https');

const CONNECTION_MONITOR_IPC_CHANNEL = 'connection-monitor'
const PING_IPC_CHANNEL = 'ping'

const CONNECTION_MONITOR_EVENTS = {
  TOGGLE_PING: 'toggle ping',
  CONNECT: 'connect',
  DISCONNECT: 'disconnect'

Ethan-Arrowood

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions

Ethan-Arrowood

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions

Ethan-Arrowood

Benchmark results for Headers class
Tested modules: undici-fetch, node-fetch, ./implementations/mapHeaders.js

Benchmark Suite results for operation: append
┌─────────┬───────────────────────────────────┬───────────────────────┬────────────────────────────────────┐
│ (index) │              Module               │      Total Time       │               Result               │
├─────────┼───────────────────────────────────┼───────────────────────┼────────────────────────────────────┤
│    0    │          'undici-fetch'           │ '552168ns (0.552ms)'  │                null                │
│    1    │           'node-fetch'            │ '1095718ns (1.096ms)' │ '98.439% slower than undici-fetch' │
│    2    │ './implementations/mapHeaders.js' │ '624987ns (0.625ms)'  │ '13.188% slower than undici-fetch' │

Ethan-Arrowood

type ConnectionContext = {
  state: 'disconnected'
  methods: {
    connect: () => Promise<void>
  }
} | {
  state: 'connected',
  data: {
    endpoint: string
  },

Ethan-Arrowood

import { deepStrictEqual } from 'assert/strict';
import { EventEmitter } from 'events';

class StopLight extends EventEmitter {
	static _data = new Map([
		[ 'GO', { color: 'green' } ],
		[ 'STOP', { color: 'red' } ],
		[ 'SLOW', { color: 'yellow' } ]
	])

Ethan-Arrowood

node test/unref-when-idle/unref-when-idle.js
TAP version 13
# Subtest: test unref
    1..0
ok 1 - test unref # time=6.285ms

TAP version 13
# Subtest: test unref worker
    ok 1 - should be equal
    1..1

Ethan-Arrowood

'use strict'

const { types } = require('util')
const { validateHeaderName, validateHeaderValue } = require('http')

const kHeaders = Symbol('headers')

function normalizeAndValidateHeaderName (name) {
  const normalizedHeaderName = name.toLowerCase()
  validateHeaderName(normalizedHeaderName)

Ethan-Arrowood

function merge(arr, start, mid, end) {
  // console.log(`m(${start}, ${mid}, ${end}) -> ${arr.slice(start, end)}`)

  for (let i = mid; i < end; i+=2) {
    let p = i
    for (let j = i - 2; j >= start; j-=2) {
      if (arr[p] < arr[j]) {
        [
          arr[p], arr[p+1],
          arr[j], arr[j+1]