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# Author: Pieter Noordhuis
# Description: Simple demo to showcase Redis PubSub with EventMachine
#
# Update 7 Oct 2010:
# - This example does *not* appear to work with Chrome >=6.0. Apparently,
#   the WebSocket protocol implementation in the cramp gem does not work
#   well with Chrome's (newer) WebSocket implementation.
#
# Requirements:
# - rubygems: eventmachine, thin, cramp, sinatra, yajl-ruby

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require 'csv'
require 'ipaddr'

last = nil
CSV.foreach("us.csv") do |row|
  next if row.empty?
  from = IPAddr.new(row[0])
  to = IPAddr.new(row[1])
  mask = from.to_i ^ to.to_i

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#Simple Authentication with Bcrypt

This tutorial is for adding authentication to a vanilla Ruby on Rails app using Bcrypt and has_secure_password.

The steps below are based on Ryan Bates's approach from Railscast #250 Authentication from Scratch (revised).

You can see the final source code here: repo. I began with a stock rails app using rails new gif_vault

##Steps

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# run with  Piece.xor_files 'output_filepath', ['infilepath1','infilepath2']

require 'inline'
Class Piece
  inline do |builder|
    builder.include '<stdlib.h>'
    builder.include '<stdio.h>'
    builder.c_singleton <<-C_CODE
    /*
    rb_input_paths_array should be a ruby array of strings, 

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{
  "vars": {
    "@gray-base": "#000",
    "@gray-darker": "lighten(@gray-base, 13.5%)",
    "@gray-dark": "lighten(@gray-base, 20%)",
    "@gray": "lighten(@gray-base, 33.5%)",
    "@gray-light": "lighten(@gray-base, 46.7%)",
    "@gray-lighter": "lighten(@gray-base, 93.5%)",
    "@brand-primary": "darken(#428bca, 6.5%)",
    "@brand-success": "#5cb85c",

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<% header "Content-Type" => "text/html" %>
<h1>Let's run some ruby code: <%= rand %></h1>

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### start_processing.action_controller

| Key           | Value                                                     |
| ------------- | --------------------------------------------------------- |
| `:controller` | The controller name                                       |
| `:action`     | The action                                                |
| `:params`     | Hash of request parameters without any filtered parameter |
| `:format`     | html/js/json/xml etc                                      |
| `:method`     | HTTP request verb                                         |

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http://redis.io/topics/admin
Redis Administration

This page contains topics related to the administration of Redis instances. Every topic is self contained in form of a FAQ. New topics will be created in the future.
Redis setup hints

    We suggest deploying Redis using the Linux operating system. Redis is also tested heavily on OS X, and tested from time to time on FreeBSD and OpenBSD systems. However Linux is where we do all the major stress testing, and where most production deployments are working.
    Make sure to set the Linux kernel overcommit memory setting to 1. Add vm.overcommit_memory = 1 to /etc/sysctl.conf and then reboot or run the command sysctl vm.overcommit_memory=1 for this to take effect immediately.
    Make sure to disable Linux kernel feature transparent huge pages, it will affect greatly both memory usage and latency in a negative way. This is accomplished with the following command: echo never > sys/kernel/mm/transparent_hugepage/enabled.
    Make sure to setup some swap in your syst

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Redis Marshaling

If you have time consuming method in your app that you call frequently, chances are that you’d like to cache it. Redis is great key-value store that can be used for this purpose. However, redis only store string values. In order to store other kinds of objects, you’ll have to use marshaling.

There is a built-in ruby class called Marshal that does the job well. The only thing you have to do is to call Marshal.dump method and pass it an object. The exact opposite is the Marshal.load method.

I’ve created helper method for easier integration with Redis. Here is how it looks:

module RedisHelper

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$ \curl -sSL https://get.rvm.io | bash -s stable
$ echo "source ~/.profile" >> ~/.bash_profile
$ echo "gem: —no-document" >> ~/.gemrc
$ rvm autolibs enable
$ rvm install ruby
$ gem install rails
$ rvm use 2.2 --default
# Update your RVM to the latest statble version.
rvm get latest
# Update your RVM to the most recent version. (most bug fixes)