Install Varnish HTTP cache on a Mac OS X box with Sprinkle and configure it for accelerating CouchDB

.gitignore

.DS_Store
Gemfile.lock

Gemfile

source 'http://rubygems.org'

gem 'sprinkle'
gem 'activesupport', '2.3.5'

varnish-couchdb-accelerator.rb

# Install Varnish HTTP cache on a Mac OS X box with Sprinkle and configure it for accelerating CouchDB
# 
# == USAGE
#
#   $ gem install bundler
#   $ bundle install
#
#   $ sudo bundle exec sprinkle --verbose --script=varnish-couchdb-accelerator.rb
#
# == INFORMATION
#
# Assuming you have Couch running on port 5984 and such, swap:
#
#   http://localhost:5984/my-database/_design/app/_view/by_something
# to:
#   http://localhost:8080/my-database/_design/app/_view/by_something
#
# and you should notice some speed difference (eg. in Firebug).
#
# Then stress load the stack with:
#   $ ab -c 50 -n 1000 "http://0.0.0.0:5984/..."
# and:
#   $ ab -c 50 -n 1000 "http://0.0.0.0:8080/..."
#
# You should see what this is all about.

package :varnish do
  requires    :varnish_dependencies
  description 'Varnish HTTP Cache'
  version     '2.1.4'

  source "http://www.varnish-software.com/sites/default/files/varnish-#{version}.tar.gz" do
    pre( :configure ) { 'sh autogen.sh' }
  end

  verify do
    has_executable 'varnishd'
    has_file       '/usr/local/etc/varnish/default.vcl'
  end

  optional :varnish_couchdb_configuration
end

package :varnish_mac_dependencies, :provides => :varnish_dependencies do
  noop     { pre :install, 'ln -sf /bin/bash /bin/sh' }
  mac_port 'automake autoconf libtool libxslt ncurses pcre groff'
end

package :varnish_linux_dependencies, :provides => :varnish_dependencies do
  noop { pre :install, 'ln -sf /bin/bash /bin/sh' }
  apt  'automake autoconf libtool libxslt ncurses pcre groff'
end

package :varnish_couchdb_configuration do
  configuration_file = '/usr/local/etc/varnish/default.vcl'

  push_text <<-'CONFIG', configuration_file, :sudo => true
# Varnish Configuration for CouchDB
backend default {
  .host = "127.0.0.1";
  .port = "5984";
}
  CONFIG

  noop   { post :install, 'varnishd -f /usr/local/etc/varnish/default.vcl -s malloc,256MB -T 127.0.0.1:2000 -a 0.0.0.0:8080' }

  verify { file_contains configuration_file, '5984' }
end


policy :varnish_couchdb_accelerator, :roles => :app do
  requires :varnish
end


deployment do
  delivery :local

  source do
    prefix   '/usr/local'           # where all source packages will be configured to install
    archives '/usr/local/sources'   # where all source packages will be downloaded to
    builds   '/usr/local/build'     # where all source packages will be built
  end
end