stonegao

require 'rubygems'
require 'sinatra'

get '/' do
  "Hello from Sinatra running on Java!"
end

stonegao

require 'rbconfig'

$stdout.sync = true

def hello(source, expect_input)
  puts "[child] Hello from #{source}"
  if expect_input
    puts "[child] Standard input contains: \"#{$stdin.readline.chomp}\""
  else
    puts "[child] No stdin, or stdin is same as parent's"

stonegao

# Demonstration of a handful of the metaprogramming features of Ruby.
# 
# This code uses the same class/module configuration as Rails' standard
# acts_as plugins. I was looking for a way to extend the behavior of an 
# ActiveRecord model in practice, and this came out of that exploration.
#
# Each "method" of extending the target class is tested and evaluated 
# for functionality and a report is printed. 
#
# Each method is tested as a class method and an instance method, 

stonegao

Installing Panda on your local machine or server

This guide is an alternative to using the prebuilt AMI which includes all the software required to run Panda.

Please note that this guide been mainly tested on OSX and Ubuntu. Please post modifications to the mailing list if you try another platform.

Before starting, your system must have a working Ruby (1.8.x) installation along with Rubygems (>= 1.3.1) and MySQL running happily.

Install dependencies

stonegao

Ubuntu 8.10 Intrepid 32-bit server AMI taken from (http://alestic.com/): ami-7cfd1a15

Useful guides:

• http://articles.slicehost.com/2009/1/6/ubuntu-intrepid-ruby-on-rails
• http://devblog.michaelgalero.com/2008/11/27/setting-up-your-ubuntu-server-for-merb/

Panda user

See this guide for details about securing an EC2 instance:

stonegao

# download, from_repo, and commit_state methods swiped from 
# http://github.com/Sutto/rails-template/blob/07b044072f3fb0b40aea27b713ca61515250f5ec/rails_template.rb

require 'open-uri'
 
def download(from, to = from.split("/").last)
  #run "curl -s -L #{from} > #{to}"
  file to, open(from).read
rescue
  puts "Can't get #{from} - Internet down?"

stonegao

class AddAttachmentsDataToWrapper < ActiveRecord::Migration
  def self.up
    add_column :wrappers, :data_file_name, :string
    add_column :wrappers, :data_content_type, :string
    add_column :wrappers, :data_file_size, :integer
    add_column :wrappers, :data_updated_at, :datetime
  end

  def self.down
    remove_column :wrappers, :data_file_name

stonegao

def transform_hash(original, options={}, &block)
  original.inject({}){|result, (key,value)|
    value = if (options[:deep] && Hash === value) 
              transform_hash(value, options, &block)
            else 
              value
            end
    block.call(result,key,value)
    result
  }

stonegao

# I want to check if Sphinx is installed on machines to auto-determine the
# version. This can be done via the following line of code:

`indexer`[/^Sphinx (\d\.\d\.\d)/, 1]

# But, if indexer doesn't exist, then we get an error sent to the shell by Ruby
# (though it's not caught by $stdout/$stderr, so I assume it's core Ruby being
# inconsistent).
# 
# I don't want the error - I have code in place to let the user know that

stonegao

module Rack
  class MemoryBloat
    def initialize(app, logger)
      @app = app
      @logger = logger
    end

    def call(env)
      memory_usage_before = memory_usage
      result = @app.call(env)