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MonitorOutdatedGems::Config.new do
  set_frequency_default "monthly"
  set_versions_default "MAJOR"
  monitor "strong_migrations", versions: "PATCH"
  monitor "browser", versions: "MINOR"
  monitor "annotate", versions: "MAJOR"
end

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My largest Sidekiq application had a memory leak and I was able to find and fix it in just few hours spent on analyzing Ruby's heap. In this post I'll show my profiling setup.

As you might know Ruby 2.1 introduced a few great changes to ObjectSpace, so now it's much easier to find a line of code that is allocating too many objects. Here is great post explaining how it's working.

I was too lazy to set up some seeding and run it locally, so I checked that test suite passes when profiling is enabled and pushed debugging to production. Production environment also suited me better since my jobs data can't be fully random generated.

So, in order to profile your worker, add this to your Sidekiq configuration:

if ENV["PROFILE"]

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Running redis using upstart on Ubuntu

I've been trying to understand how to setup systems from the ground up on Ubuntu. I just installed redis onto the box and here's how I did it and some things to look out for.

To install:

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# config/deploy.rb

namespace :upstart do
  desc 'Generate and upload Upstard configs for daemons needed by the app'
  task :update_configs, except: {no_release: true} do
    upstart_config_files = File.expand_path('../upstart/*.conf.erb', __FILE__)
    upstart_root         = '/etc/init'

    Dir[upstart_config_files].each do |upstart_config_file|
      config = ERB.new(IO.read(upstart_config_file)).result(binding)

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class TicTacToe
  attr_accessor :board, :winner
  attr_reader :winning_positions

  def initialize
    @board = create_board
    @winner = nil
    @winning_positions = [ [1, 2, 3], [4, 5, 6], [7, 8, 9], [1, 4, 7], [2, 5, 8], [3, 6, 9], [1, 5, 9], [3, 5, 7] ]
  end

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class Product < ActiveRecord::Base

  scope :approved, -> { where(:approved => true) }

  serialize :large_dimensions

  belongs_to :submitter, class_name: 'User', foreign_key: 'user_id'

  has_many :likes, as: :likeable, dependent: :destroy

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<!-- 
    The purpose of the following is to provide a callback to the parent window 
    so we can transfer the data retrieved from Gmail omnicontacts 
-->

<%= hidden_field_tag 'contacts_callback', @contacts.to_json, id: "contacts_callback" %>

<% content_for :scripts do %>
	<script>
		//	Set a Global variable to be accessed by the parent window

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#!/usr/bin/env ruby
require 'open-uri'
require 'JSON'
require 'digest/sha2'
require 'pry'
require 'bigdecimal'
require 'bitcoin' # Because I need to cheat every now and then

# Usage:
# gem install pry json ffi ruby-bitcoin

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<% content_for :head do %>
<% end %>

<% if flash[:notice] %>
	<div class="alert alert-success">
		<button type="button" class="close" data-dismiss="alert">×</button>
		<%= flash[:notice] %>
	</div>
<% end %>

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#route
resources :users do
  get :activate, on: :member
end
 
#view
<%= form_for @user, :url => activate_user_path(@user) do |f| %>
....
<% end %>