Scripts to set up an EngineYard AppCloud that will use Amazon S3 as its assets host. These scripts will sync your public directory (including any cache files such as cached javascript) up to a bucket on S3 which can then be used as an asset host.

before_symlink.rb

# EngineYard AppCloud before_symlink to copy public files to S3
# lives in $RAILS_ROOT/deploy/before_symlink.rb
#

# Only need to run once
on_app_master do
  aws_bucket     = "<BUCKET_NAME>"
  aws_access_key = "<YOUR ACCESS ID>"
  aws_secret_key = "<YOUR SECRET KEY>"

  # Generate all cache files
  run "RAILS_ENV=#{environment} #{release_path}/script/generate_asset_cache_files.rb"
  
  # Run the S3SYNC (http://www.s3sync.net/)
  # gem install s3snc
  # This exports over ssl all files in the public directory and makes the readable by the public
  run "export AWS_ACCESS_KEY_ID=#{aws_access_key};export AWS_SECRET_ACCESS_KEY=#{aws_secret_key}; s3sync -s -p -v --progress --make-dirs -r #{release_path}/public #{aws_bucket}:"
end

generate_asset_cache_files.rb

#!/usr/bin/env ruby

# Script resides at
# $RAILS_ROOT/script/generate_asset_cache_files.rb
# 
# Big assist on this to Kyle Burton
#

require 'net/http'
require 'uri'

env = ENV['RAILS_ENV'] || "development" # Environment to run

# List of all URLs needed to generate all cached content that should be synced out to the asset host
urls = ["/"]
port = 3009

#
# We need the retries as the Webrick server may not be ready right away
#
max_retries = 20

cmd = "#{File.join(File.dirname(__FILE__))}/server -e #{env} -p #{port} -d"
puts "Starting Webrick with #{cmd}"
unless system(cmd)
  raise "Problem booting webrick!"
end

try_count = 0
urls.each do |url|
  make_request = true
  while make_request and try_count < max_retries do
    begin
      full_url = "http://localhost:#{port}#{url}"
      puts "Getting url #{full_url}"
      Net::HTTP.get_print URI.parse(full_url)
      puts "Got url #{full_url}"
      make_request=false
    rescue Exception => e
      puts "Errored...#{e.inspect}" 
      try_count += 1
      sleep 2
    end
  end
end

res = `ps aux | grep [r]uby | grep [s]cript/server`
pid = res.split[1]

puts "Killing Webrick"
Process.kill "KILL", pid.to_i