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View index.js
const { createServer } = require('http');
createServer((req, res) => {
res.writeHead(200, {
Connection: 'Transfer-Encoding',
'Content-Type': 'text/html; charset=utf-8',
'Transfer-Encoding': 'chunked'
PatrickJS /
Created Sep 9, 2019 — forked from Rich-Harris/
Stuff I wish I'd known sooner about service workers

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via

Use Canary for development instead of Chrome stable

Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.

View LoadableWebpackPlugin.js
/* eslint-disable no-param-reassign */
const path = require('path');
const fse = require('fs-extra');
class LoadablePlugin {
constructor({ filename = 'loadable-stats.json', writeToFileEmit = false } = {}) {
this.opts = { filename, writeToFileEmit };
apply(compiler) {
PatrickJS / 1.js
Created Sep 14, 2018 — forked from getify/1.js
tag function for formatting console.log(..) statements
View 1.js
function logger(strings,...values) {
var str = "";
for (let i = 0; i < strings.length; i++) {
if (i > 0) {
if (values[i-1] && typeof values[i-1] == "object") {
if (values[i-1] instanceof Error) {
if (values[i-1].stack) {
str += values[i-1].stack;
PatrickJS /
Created Sep 14, 2018
List of AWS availability zones for each AWS region
AWS region code AWS region name Number of AZs AZ names
us-east-1 Virginia 4 us-east-1a, us-east-1b, us-east-1c, us-east-1e
us-west-1 N. California 2 us-west-1a, us-west-1b
us-west-2 Oregon 3 us-west-2a, us-west-2b, us-west-2c
eu-west-1 Ireland 3 eu-west-1a, eu-west-1b, eu-west-1c
eu-central-1 Frankfurt 2 eu-central-1a, eu-central-1b
ap-southeast-1 Singapore 2 ap-southeast-1a, ap-southeast-1b
ap-southeast-2 Sydney 2 ap-southeast-2a, ap-southeast-2b, ap-southeast-2c
ap-northeast-1 Tokyo 2 ap-northeast-1a, ap-nort
PatrickJS / pwnd.js
Created Sep 12, 2018 — forked from jgrahamc/pwnd.js
Cloudflare Workers that adds an "Cf-Password-Pwnd" header to a POST request indicating whether the 'password' field appears in Troy Hunt's database of pwned passwords.
View pwnd.js
addEventListener('fetch', event => {
async function fetchAndCheckPassword(req) {
if (req.method == "POST") {
try {
const post = await req.formData();
const pwd = post.get('password')
const enc = new TextEncoder("utf-8").encode(pwd)
PatrickJS / cloudflare-workers-apilityio.js
Created Aug 27, 2018 — forked from diegoparrilla/cloudflare-workers-apilityio.js
Using Cloudflare Workers and API add to the request headers information of the blacklists of abusers that contains the IP address of the client.
View cloudflare-workers-apilityio.js
addEventListener('fetch', event => {
async function fetchAndCheckOrigin(req) {
try {
startTime = new Date();
const body = await req.body;
const ip = req.headers.get('cf-connecting-ip');
const es = req.headers.get('cf-ipcountry');

Scaling your API with rate limiters

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

Request rate limiter

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.

PatrickJS / Event-stream based GraphQL
Created Aug 22, 2018 — forked from OlegIlyenko/Event-stream based GraphQL
Event-stream based GraphQL subscriptions for real-time updates
View Event-stream based GraphQL

In this gist I would like to describe an idea for GraphQL subscriptions. It was inspired by conversations about subscriptions in the GraphQL slack channel and different GH issues, like #89 and #411.

Conceptual Model

At the moment GraphQL allows 2 types of queries:

  • query
  • mutation

Reference implementation also adds the third type: subscription. It does not have any semantics yet, so here I would like to propose one possible semantics interpretation and the reasoning behind it.

PatrickJS / buildSitemap.js
Created Jul 27, 2018 — forked from evantahler/buildSitemap.js
35 lines to build a sitemap for next.js projects
View buildSitemap.js
#! /usr/bin/env node
// I am ./bin/buildSitemap.js
const path = require('path')
const glob = require('glob')
const fs = require('fs')
const SITE_ROOT = process.env.SITE_ROOT || ''
const SOURCE = process.env.SOURCE || path.join(__dirname, '..', 'pages', '/**/*.js')
const DESTINATION = process.env.DESTINATION || path.join(__dirname, '..', 'static', 'sitemap.xml')
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