Log Handler

report_log.rb

require 'chef/handler'
require 'chef/log'
require 'json'


# Based on https://docs.chef.io/handlers.html#cookbook-versions
# and http://dev.nuclearrooster.com/2011/05/10/chef-notifying-and-logging-updated-resources


module Handlers
  class LogHandler < Chef::Handler

    def initialize opts={}
      @max_entries = opts[:max_entries] || 25
    end


    def report
      cookbooks = run_context.cookbook_collection
      cookbook_versions = cookbooks.keys.inject({}) do |h, k|
        cb = cookbooks[k]
        h[cb.name.to_s] = cb.version.to_s
        h
      end

      updates = run_status.updated_resources.map do |resource|
        {
          'time' => Time.now,
          'cookbook_version' => cookbook_versions[resource.cookbook_name.to_s],
          'cookbook_name' => resource.cookbook_name,
          'recipe_name' => resource.recipe_name,
          'action' => resource.action,
          'resource' => resource.name,
          'resource_type' => resource.resource_name
        }
      end

      node.automatic['cookbook_versions'] = cookbook_versions

      node.automatic['log'] ||= []
      log = node.automatic['log'].to_a
      updates.each do |update|
        log.unshift update
      end

      node.automatic['log'] = log.take @max_entries
      node.save

      Chef::Log.debug 'Cookbook Versions: %s' % JSON.pretty_generate(node['cookbook_versions'])
      Chef::Log.debug 'Updated Resources: %s' % JSON.pretty_generate(node['log'].reverse)
    end


  end
end