troelskn

# Requires ImageMagick


# Converting the source from JPEG to PNG - if necessary
convert my_src_image.jpg my_src_image.png


# Option A
#  - Requires a temporary intermediate file
#  - Drill more than 10 might result in poor results

troelskn

class ApplicationController < ActionController::Base
  layout :conditionally_select_layout

  # Like  `layout`, but allows conditional overriding in app controller
  def self.preferred_layout(value = nil)
    @preferred_layout = value unless value.nil?
    @preferred_layout
  end

  private

troelskn

I benchmarked identity_cache with memcached vs. default active_record against mysql.

Setup is running on AWS, same availability zone. I used RDS (Multi AZ setup) for MySql and ElastiCache for memcached. The test server is on EC2. Instance types are m3.large for MySql, m3.xlarge for EC2 and r3.large for memcached.

The database is a copy of our production db. The products table holds about 1.4M entries.

The cache has been pre-heated with all 1.4M entries prior to the test.

During the test, I ran 10000 fetches:

troelskn

require 'thinking_sphinx/middlewares'

module ThinkingSphinx
  module Middlewares
    class IdentityCacheMiddleware < ActiveRecordTranslator

      def call(contexts)
        contexts.each do |context|
          Inner.new(context).call
        end

troelskn

require 'ipaddr'
require 'net/http'
require 'uri'
require 'json'

module GeoIP
  def self.configuration
    @configuration ||= {}
  end

troelskn

require 'rubygems'
require 'rake'
require 'ostruct'
require 'fileutils'

module Ftp
  def self.invoke(config = {}, &block)
    commands = []
    commands << "set ftp:list-options -a"
    commands << "set ftp:ssl-allow no" if config.disable_ssl

troelskn

Keybase proof

I hereby claim:

• I am troelskn on github.
• I am troelskn (https://keybase.io/troelskn) on keybase.
• I have a public key whose fingerprint is FCE4 73F5 52AA C2B0 B73D FEC2 680B 1145 00F1 D09E

To claim this, I am signing this object:

troelskn

<?php
/**
 * Write with file extension xls and you should be fine.
 * This format is called SpreadsheetML
 */
class SimpleXlsWriter {
  protected $filename;
  protected $handle;
  protected $title = "No Title";
  protected $author = "No Author";

troelskn

class Class
  # Adds a initialize method, which takes attributes as a hash
  # Optionally call with symbol-names, to additionally create attribute accessors with `attr_accessor`
  def attr_initializer(*args)
    attr_accessor *args unless args.empty?
    module_eval <<-END
  def initialize(attributes = {})
    initialize_attributes(attributes)
  end
  def initialize_attributes(attributes = {})

troelskn

#!/usr/bin/env ruby
def parse_missing_required(input)
  matches = input.match(/Missing these required gems:([\s\S]*)You're running:/)
  matches[1].strip.split("\n").map do |line|
    m = line.match(/^\s*(\S+)\s+(\S+\s+[0-9.]+)/)
    p line if m.nil?
    {:name => m[1], :version => m[2]}
  end
end