Chef - access new_resource from library

Question

Is there a way I can access new_resource attributes from inside a Chef library (in libraries/default.rb) ?

My current solution is:

In libraries/default.rb

module Libraries
    def init(resource)
       @@server_name = resource.server_name
       @@server_type = resource.server_type
       @@script      = get_script_path
       ...
    end
    def get_script_path
       if @@server_type == 'admin'
          script = 'admin_cntl.sh'
          path   = '/admin_server/bin'
       elsif @@server_type == 'managed'
          script = 'managed_cntl.sh'
          path   = '/managed_server/bin'
       end
       ::File.join(path, script)
    end
end

In providers/default.rb

include Libraries

action :start do 
   init(new_resource)
   execute 'my_script' do 
      command "./#{@@script} start"
   end
end

action :remove do 
   init(new_resource)
   execute 'my_script' do 
      command "./#{@@script} stop"
   end
end

I think this is unnecessary overhead but I couldn't come up with a better solution.

Is there a better way ?

Answer 1

Use a normal mixin:

# libraries/default.rb
module MyLibrary
  def script_path
    case new_resource.server_type
    when 'admin'
      '/admin_server/bin/admin_cntl.sh'
    when 'managed'
      '/managed_server/bin/managed_cntl.sh'
    end
  end
end

# providers/default.rb
include MyLibrary

action :start do 
   execute 'my_script' do 
      command "./#{script_path} start"
   end
end

action :remove do 
   execute 'my_script' do 
      command "./#{script_path} stop"
   end
end

Also remember you can define methods directly in the provider if they are only useful for that one provider.