[chef] Re: help abstracting WET code to methods in a library cookbook

OK. This works:

urmom/libraries/halper.rb
  module Urmom; module Halper;
    def self.saysomethin(say)
      puts "==================== HIGGS-BOSON: #{say} .. from the library call"
    end
  end

urmom/resources/default.rb
  actions :saywhat, :sayinsult
  default_action :saywhat
  attribute :say, :kind_of => String, :default => "urmom", :name_attribute => 
true

urmom/providers/default.rb
  include Urmom::Halper
  action :saywhat do
    say = new_resource.name + " .. from the LWRP"
    ::Urmom::Halper.saysomethin(say)
  end

hoosier/recipes/default.rb
  Chef::Recipe.send(:include, Urmom::Halper)

  ::Urmom::Halper.saysomethin("kerfuffle")

  urmom "dooooooootdeedoo" do
  end



jazzbutcher$ chef-client -z -o recipe[hoosier] | grep HIGGS
==================== HIGGS-BOSON: kerfuffle .. from the library call
==================== HIGGS-BOSON: dooooooootdeedoo .. from the LWRP .. from 
the library call


\o/
kallen


On Tue, 19 Nov 2013, 

 
 wrote:

> Greetings Chefizens,
>
> I'm trying to abstract some WET code I have sprinkled around several of my
> recipes into a library. I'm trying to define a method in a "library 
> cookbook",
> and use that method in a different cookbook. But I'm failing. Below I show 
> a few
> techniques I'm trying. The examples below are contrived and very simple --
> I want to start simple and actually get it, before I try more abstractions
> layered on top (say, LWRP).
>
> Docs I'm reading in an attempt to teach myself how to wield library 
> cookbooks in
> this manner:
>
> [1] http://stackoverflow.com/questions/15595144/dry-within-a-chef-recipe
> [2] 
> http://stackoverflow.com/questions/17333486/how-do-i-share-code-across-chef-cookbooks-in-a-chef-repo
> [3] 
> http://www.opscode.com/blog/2013/09/04/demystifying-common-idioms-in-chef-recipes/
> [4] 
> http://dougireton.com/blog/2012/12/16/how-to-include-the-windows-cookbook-helper-methods-in-your-chef-recipe/
> [5] http://docs.opscode.com/essentials_cookbook_libraries.html
>
>
> All of my attempts result in:
>
>   Recipe Compile Error in 
> /var/cache/chef/cookbooks/hoosier/recipes/default.rb
>   NameError
>   uninitialized constant Chef::Recipe::Urmom
>
>
> And so:
>
> The cookbook "urmom" has a "halper" library: 
> cookbooks/urmom/libraries/halper.rb:
>
>   module Halper
>     def saywhat
>       return "urmom"
>     end
>   end
>
>
> The cookbook "hoosier" has a dependency set in metadata.rb on "urmom". It 
> is in
> hoosier's default recipe that I'm trying these tests.
>
>   foo = Urmom::Halper.saywhat
>   Chef::Log.debug("HIGGS-BOSON: result: #{foo}")
>
> I run it: chef-client -l debug -L /var/log/chef/client.log -o 
> "recipe[hoosier]"
>
>
> This technique is how I understood what [1] is saying.
>
>
>
> Next I try this in recipe[hoosier::default], based on [3] and [4]:
>
>   ::Chef::Recipe.send(:include, Urmom::Halper)
>   foo = Urmom::Halper.saywhat
>   Chef::Log.debug("HIGGS-BOSON: result: #{foo}")
>
>
>
> Next I try:
>
>   extend Urmom::Halper
>   foo = Urmom::Halper.saywhat
>   Chef::Log.debug("HIGGS-BOSON: result: #{foo}")
>
>
>
> Last, I change the Halper library, per Ranjib Dey's comment in [3]:
>
>   class Chef::Recipe::Halper
>     def saywhat
>       return "urmom"
>     end
>   end
>
>
> The calling recipe is still:
>
>   foo = saywhat
>   Chef::Log.debug("HIGGS-BOSON: result: #{foo}")
>
>
>
> Any help graciously accepted :>
> kallen