Chef Handler Example Exception Handling

chef_handler_example.rb

# attributes
default['cron']['service_name'] = 'cron'

# recipe
include_recipe 'chef_handler'

cookbook_file "#{node['chef_handler']['handler_path']}/blah.rb" do
  source 'blah.rb'
  action :create
end

chef_handler 'Rightscale::BlahHandler' do
  source "#{node['chef_handler']['handler_path']}/blah.rb"
  action :enable
end

service node['cron']['service_name'] do
  action :stop
end

# The failing resource
execute 'blah'

service node['cron']['service_name'] do
  action :start
end

# The handler ruby code (files/default/blah.rb)
module Rightscale
  class BlahHandler < Chef::Handler
    def report
      # Node can be accessed by `run_context.node`
      cron_service_name = run_context.node['cron']['service_name']
      # Find the resource from the resource collection
      cron_resource = run_context.resource_collection.lookup("service[#{cron_service_name}]")
      # Run the :start action of the resource found.
      cron_resource.run_action(:start) if cron_resource
      Chef::Log.error 'Cron service started.'
    end
  end
end

cool!