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Rails System Test Supervisor

System tests with Rails, Capybara, and Selenium (with the Chrome driver) may go rogue and spike the CPU to 100% on the spawned browser depending on how heavily you've monkey patched these libraries and/or have complex JavaScript that mutates the DOM (morphs etc.).

This supervisor class monitors the driver process and its children and will kill any rogue process that persistently spikes to >=99% CPU utilization for an extended period of time. If and when this occurs, you lose control of the browser and your tests will hang until they eventually time out or error.

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Smart Heroku Review Apps managed by GitHub Actions

This gist aims to provide a simple solution for managing Heroku Review Apps with GitHub Actions due to the security incident that continues to disrupt Heroku's GitHub integration. Watch the demo to learn more.

.github
├── workflows
│   ├── heroku_review_app_create.yml

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Cron Cheat Sheet

sudo crontab -e

# Example of job definition:
# .---------------- minute (0 - 59)
# | .------------- hour (0 - 23)

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const hoverTime = 400
const fetchers = {}
const doc = document.implementation.createHTMLDocument('prefetch')

function fetchPage (url, success) {
  const xhr = new XMLHttpRequest()
  xhr.open('GET', url)
  xhr.setRequestHeader('VND.PREFETCH', 'true')
  xhr.setRequestHeader('Accept', 'text/html')
  xhr.onreadystatechange = () => {

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class Array

  # Divides the Array into equally sized chunks.
  #
  # @example
  #   list = ["a", "b", "c", "d", "e", "f"]
  #   list.divide(3) # => [["a", "b"], ["c", "d"], ["e", "f"]]
  #
  # @param [Integer] count A recommended number of chunks (sub lists) to create.
  #   The calculated chunk size is rounded up,

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module Resourceful

  def self.actions
    [:index, :show, :new, :edit, :create, :update, :destroy]
  end

  def self.callbacks
    [:before, :after, :respond_to]
  end

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FROM ruby:3.0-alpine

RUN apk add --no-cache --update \
ack \
bash \
build-base \
curl \
git \
htop \
less \

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class ExampleJob < ApplicationJob
  queue_as :default
  
  def perform(user)
    # do some work
    
    # HACK: get around limitations in devise/warden when rendering
    #       views outside the context of a formal http request
    renderer = ::ApplicationController.renderer.new
    renderer_env = renderer.instance_eval { @env }

hopsoft

Heroku Review Apps managed by GitHub Actions

This gist aims to provide a simple solution for managing Heroku Review Apps with GitHub Actions due to the security incident that continues to disrupt Heroku's GitHub integration.

.github
├── workflows
│   ├── heroku_review_app_create.yml
│   └── heroku_review_app_destroy.yml

hopsoft

# frozen_string_literal: true

class ApplicationReflex < StimulusReflex::Reflex
  # Put application-wide Reflex behavior and callbacks in this file.
  #
  # Example:
  #
  #   # If your ActionCable connection is: `identified_by :current_user`
  #   delegate :current_user, to: :connection
  #