generate haproxy.cfg with chef

haproxy.rb

# Wrapper cookbook snippet and upstream cookbook here: https://github.com/sous-chefs/haproxy

haproxy_lb 'backend-service-name-here' do
  params([
           'bind 0.0.0.0:80',
           'mode http',
           'balance roundrobin',
           'option forwardfor',
           'option http-server-close'
         ])
  @params << "maxconn #{node['webloadbalancer']['dispatchers']['maxconn']}"

  # populate backend servers via chef search
  search_criteria = ''
  search_criteria << %(chef_environment:#{node.chef_environment})
  search_criteria << ' AND '
  search_criteria << %(run_list:recipe\\[#{service_cookbook}\\:\\:#{service_recipe}\\])
  search('node', search_criteria).sort.each do |n|
    @params << "server #{n['name']} #{n['ipaddress']}:#{node['webloadbalancer']['forward-port']} weight 100 check inter 5s rise 2 fall 3"
  end
end

include_recipe 'haproxy::manual'