Bruno Arueira brunoarueira

You can inherit the environment variables from PID 1 by iterating over the list of null-terminated strings in /proc/1/environ, parsing the first characters up to the first = as the variable name, setting the remaining value as that variable, and exporting it.

The Code Snippet

This works with multiline environment variables, and environment variables with arbitrary values, like strings, including = or JSON blobs.

Paste this in your current terminal session to inherit the environment variables from PID 1:

JWT Auth + Refresh Tokens in Rails

This is just some code I recently used in my development application in order to add token-based authentication for my api-only rails app. The api-client was to be consumed by a mobile application, so I needed an authentication solution that would keep the user logged in indefinetly and the only way to do this was either using refresh tokens or sliding sessions.

I also needed a way to both blacklist and whitelist tokens based on a unique identifier (jti)

Before trying it out DIY, I considered using:

Faster Rails tests

Feedback loop speed in one of the biggest contributing factors to overall development time. The faster you get results, the faster you can move on to other things. A fast enough test suite is therefore critical to teams' success, and is worth investing some time at the beginning to save in the long run.

Below is a list of techniques for speeding up a Rails test suite. It is not comprehensive, but should definitely provide some quick wins. This list of techniques assumes you're using minitest, but most everything should translate over to rspec by simply replacing test/test_helper.rb with spec/spec_helper.rb.

Lead with data
bcrypt
bootsnap
Cache Time::utc calls

Theming Ant Design with Sass and Webpack

This is a solution on how to theme/customize Ant Design (which is written in Less) with Sass and webpack. Ant itself offers two solutions and a related article on theming, but these are only applicable if you use Less, the antd-init boilerplate or dva-cli.

What this solution offers:

use a single sass-file to customize (no duplicate variables for your project and Ant)
hot reload compatibility
no dependencies on outdated npm modules
easy integration with your existing webpack setup (webpack 3+ tested)

Edit: This list is now maintained in the rust-anthology repo.

Introduction
Ownership
- Where Rust Really Shines
- Rust Means Never Having to Close a Socket
The Problem with Single-threaded Shared Mutability

	#!/usr/bin/env bash

	set -eu

	# Finds the heroku slug id from the compile apps latests releases
	# via the commit SHA
	function heroku_slug () {
	heroku releases --app ${1} --json \| \
	jq -rc --arg commit "${2}" \
	'.[]

	DUMP
	// pod-name name of the postgres pod
	// postgres-user database user that is able to access the database
	// database-name name of the database
	kubectl exec [pod-name] -- bash -c "pg_dump -U [postgres-user] [database-name]" > database.sql

	RESTORE
	// pod-name name of the postgres pod
	// postgres-user database user that is able to access the database
	// database-name name of the database

	# spec/support/webpack.rb

	module WebpackTestBuild
	TS_FILE = Rails.root.join("tmp", "webpack-spec-timestamp")
	class << self
	attr_accessor :already_built
	end

	def self.run_webpack
	puts "running webpack-test"

	module FactoryGirl
	module Doctor
	module FloatDuration
	refine Float do
	def duration
	t = self
	format("%02d:%02d.%03d", t / 60, t % 60, t.modulo(1) * 1000)
	end
	end
	end

	# if you want to render flamegraphs
	gem "stackprof", require: false # required by flamegraph
	gem "flamegraph", require: false