Forecast.rb

module Forecast
  
  # The farm is collected into this object.
  class Farm
    def initialize(name)
      @name = name
      @roles = []
    end
    
    def add_role(role)
      @roles.push role
    end
  end
  
  def farm(name, &block)
    puts "Making a farm called #{name}"
    
    # Set the currect farm
    @farm = Farm.new(name)
    
    block.call
  end
  
  def region(name)
    puts "Region: #{name}"
  end
  
  def role(name, &block)
    # where are we going to keep all the instance information ?? Some object?
   #@role = Role.new(name) << this object is what all the methods will act on
    
    puts "Role: #{@role.inspect}"
    block.call
    
    #@farm.add_role @role
    #@role = nil
  end
  
  # These methods might need to be moved
  def has_roles(*roles)
    puts "Roles #{roles.join(',')}"
  end
  
  def ip(ipvalue)
    puts "Role will have static IP: #{ipvalue}"
  end
  
  def size(size_value)
    puts "Role instance will be of size: #{size_value}"
  end
  
  def ebs(path, size)
    puts "Role will have EBS mounted on '#{path}' of size #{size}GB"
  end
  
  def minimum(number)
    puts "Minimum instances will be #{number}"
  end
  
  def maximum(number)
    puts "Minimum instances will be #{number}"
  end
  
  def disk(disksize)
    puts "Disk size #{disksize}"
  end
  
  module AWS
    def ec2(name, &block)
      puts "EC2 #{name}"
      block.call
    end
    
    def rds(name, &block)
      puts "RDS #{name}"
    end
  end
  
  module Rackspace
    def cloudserver(name, &block)
      puts "CloudServer #{name}"
    end
  end
  
  module DynamicDNS
    def domain(name, &block)
      puts "Domain #{name}"
    end
  end
end




#-- example script --
include Forecast

farm "chem" do 
  include DynamicDNS
  include AWS
  
  region :eu_west_1
  
  ec2 :proxy_varnish do
    has_roles :proxy, :varnish
    ip  "79.79.79.79"
  end
  
  ec2 :site do
    has_roles :webserver
    size    :m1small
    ebs     "/var/www/vhosts/chemical",  100
    ebs     "/var/www/vhosts/forum",    100
    minimum 1
    maximum 10
  end
  
  rds :ourdb do
    size    :massive
    disk    20
    domain  "db.chems.3ev.info"
  end
  
  include Rackspace
  
  cloudserver :backup do
    has_roles :mirror_live
    domain  "www.12.23.34.123.com"
  end
  
  cloudserver :hydrogen do
    has_roles :dev, :fullstackweb
  end
end