Lord Norlan Mumar lmumar

How to create small, unique tokens in Ruby

That is is basically a "fork" of blog article i'm constantly returning to. It seems that the blog is down:

My choice: Dave Bass’s rand().to_s() trick

Dave Bass proposed this which I picked up for my implementation (here for an 8-chars token):

How not to fuck up OAuth2

I've seen a number of articles posted here recently that just give terrible advice when it comes to OAuth2, so I figured I'd make this so people would dick themselves over.

The reason people do this, is because they are just writing filler nonsense content in the hopes you'll click on the website. They don't care if the content is solid because they just want you to see the ads.

As for my credentials, I work for a major fintech company with part of my duties being to help developers get set up with OAuth2 in their applications.

If you aren't a lazy fuck, just read this, and the next section on decoupling. Otherwise I've summarised the important bits later on.

Turning PostgreSQL into a queue serving 10,000 jobs per second

RDBMS-based job queues have been criticized recently for being unable to handle heavy loads. And they deserve it, to some extent, because the queries used to safely lock a job have been pretty hairy. SELECT FOR UPDATE followed by an UPDATE works fine at first, but then you add more workers, and each is trying to SELECT FOR UPDATE the same row (and maybe throwing NOWAIT in there, then catching the errors and retrying), and things slow down.

On top of that, they have to actually update the row to mark it as locked, so the rest of your workers are sitting there waiting while one of them propagates its lock to disk (and the disks of however many servers you're replicating to). QueueClassic got some mileage out of the novel idea of randomly picking a row near the front of the queue to lock, but I can't still seem to get more than an an extra few hundred jobs per second out of it under heavy load.

So, many developers have started going straight t

Configuring Emacs for react, es6, and flow

For a while, JSX and new es6 syntax had flaky support in emacs, but there's been huge work on a lot of packages. Using emacs for JavaScript with React, ES6, and Flow (or Typescript, etc) is really easy and powerful in Emacs these days.

This is how you can work on modern web development projects with full support for tooling like JSX, Flow types, live eslint errors, automatic prettier.js formatting, and more.

Set up `web-mode`

web-mode provides most of the underlying functionality, so a huge shout-out to the maintainer(s) there.

	brew tap homebrew/versions
	brew install v8-315

	gem install libv8 -v '3.16.14.13' -- --with-system-v8
	gem install therubyracer -- --with-v8-dir=/usr/local/opt/v8-315

	bundle install

	//
	// Author: Jonathan Blow
	// Version: 1
	// Date: 31 August, 2018
	//
	// This code is released under the MIT license, which you can find at
	//
	// https://opensource.org/licenses/MIT
	//
	//

	# Encoding: utf-8

	#
	# idle.rb
	#
	# goal:
	# Ruby script to test how to fetch IMAP mails with IDLE mode.
	# IMAP IDLE allow a sort of "push" / "real-time" delivery.
	#
	# I used the script to test LATENCY (end-to-end delivery times)

	[Unit]
	Description=Puma Rails Server
	After=network.target

	[Service]
	Type=simple
	User=deploy
	WorkingDirectory=/home/deploy/app/current
	ExecStart=/home/deploy/.rbenv/bin/rbenv exec bundle exec puma -C /home/deploy/app/shared/config/puma.rb
	ExecStop=/home/deploy/.rbenv/bin/rbenv exec bundle exec pumactl -S /home/deploy/app/shared/tmp/pids/puma.state stop

	const redisClient = redis.createClient(REDIS_URL);
	const listeners = Object.create(null);

	function addListener(channel, listener) {
	if (!listeners[channel]) {
	listeners[channel] = [];
	redisClient.subscribe(channel);
	}

	listeners[channel].push(listener);

	import EXIF from 'exif-js';

	const hasBlobConstructor = typeof (Blob) !== 'undefined' && (function checkBlobConstructor() {
	try {
	return Boolean(new Blob());
	} catch (error) {
	return false;
	}
	}());