Class: CycleChefHandler

Inherits:
Chef::Handler
  • Object
show all
Defined in:
lib/cycle_chef_handler.rb

Constant Summary collapse

VERSION = 
'1.2.2'

Instance Method Summary collapse

Constructor Details

#initialize(params) ⇒ CycleChefHandler

Returns a new instance of CycleChefHandler.



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# File 'lib/cycle_chef_handler.rb', line 32

def initialize(params)
  defaults = {:exchange    => 'chef',
              :exchange_type => :direct,
              :exchange_durable => false,
              :exchange_autodelete => false,
              :bind_queue => false,
              :queue => nil,
              :queue_durable => false,
              :queue_autodelete => true,
              :routing_key => 'chef',
              :max_retries => 5,
              :retry_delay => 5}

  @amqp_config = defaults.merge(params[:amqp_config])
  check_amqp_config

  @extras = params[:extras] || {}
  @converge_index_file = params[:converge_index_file] || '/var/run/chef/converge_index'
  @failed_converge_file = params[:failed_converge_count_file] || '/var/run/chef/failed_converge_count'
end

Instance Method Details

#check_amqp_config ⇒ Object 



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# File 'lib/cycle_chef_handler.rb', line 53

def check_amqp_config
  [:host, :exchange].each do |i|
    if not @amqp_config[i]
      raise ArgumentError, ":amqp_config missing value for #{i}"
    end
  end
end

#clear_count_file(count_file) ⇒ Object 



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# File 'lib/cycle_chef_handler.rb', line 200

def clear_count_file(count_file)
  if File.exist? count_file
    FileUtils.rm count_file
  end
end

#create_ad ⇒ Object 



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# File 'lib/cycle_chef_handler.rb', line 131

def create_ad
  ad = ClassAd.new
  ad['AdType']              = 'Chef.Host'
  ad['ChefNode']            = Chef::Config[:node_name]
  ad['ConvergeStartTime']   = start_time
  ad['ConvergeEndTime']     = end_time
  ad['ConvergeElapsedTime'] = RelativeTime.new(elapsed_time)

  updated = []
  if not updated_resources.nil?
    updated = updated_resources.map {|x| x.to_s}
  end

  ad['UpdatedResources']      = updated
  ad['UpdatedResourcesCount'] = updated.size
  ad['ConvergeIndex']         = increment_count_file(@converge_index_file)
  ad['ChefServerUrl']         = Chef::Config[:chef_server_url]
  ad['ChefServerHostName']    = URI.parse(Chef::Config[:chef_server_url]).host
  ad['ChefClientVersion']     = Chef::VERSION
  ad['CycleChefHandlerVersion'] = CycleChefHandler::VERSION
  ad['Success']               = success?

  exception = nil
  backtrace = nil
  if failed?
    exception = run_status.formatted_exception
    backtrace = run_status.backtrace
    ad['FailedConvergeCount'] = increment_count_file(@failed_converge_file)
  else
    clear_count_file(@failed_converge_file)
    ad['FailedConvergeCount'] = 0
  end

  ad['Exception']             = exception
  ad['Backtrace']             = backtrace

  @extras.each do |k,v|
    ad[k] = v
  end

  ad
end

#increment_count_file(count_file) ⇒ Object 



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# File 'lib/cycle_chef_handler.rb', line 174

def increment_count_file(count_file)
  file_dir = File.dirname(count_file)
  if not File.directory? file_dir
    FileUtils.mkdir_p file_dir
  end
 
  count = nil
  if File.exists? count_file
    File.open(count_file) do |file|
      count = file.readline.chomp.to_i
    end
  end

  if count.nil?
    count = 1
  else
    count += 1
  end

  File.open(count_file, "w") do |file|
    file.puts(count)
  end
    
  count
end

#report ⇒ Object 



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# File 'lib/cycle_chef_handler.rb', line 62

def report

  ## Create and Post a classad
  ad = create_ad
  payload = "<classads>" + ad.to_xml + "</classads>"
  
  for attempt in 1..@amqp_config[:max_retries] do
    begin

      b = Bunny.new(@amqp_config)

      b.start
      e = b.exchange(@amqp_config[:exchange], 
                    :type        => @amqp_config[:exchange_type],
                    :durable     => @amqp_config[:exchange_durable], 
                    :auto_delete => @amqp_config[:exchange_autodelete])

      # in some cases, the user may want to declare and bind a queue
      # to the exchange so consumers get all messages, even ones that 
      # enter the exchange before the consumer exists.
      if @amqp_config[:bind_queue]
        q = b.queue(@amqp_config[:queue], 
                   :durable     => @amqp_config[:queue_durable],
                   :auto_delete => @amqp_config[:queue_autodelete])

        if not @amqp_config[:routing_key].nil?

          q.bind(@amqp_config[:exchange], :key => @amqp_config[:routing_key])

        else

          q.bind(@amqp_config[:exchange])

        end

      end

      if not @amqp_config[:routing_key].nil?

        e.publish(payload, :key => @amqp_config[:routing_key])

      else
        
        e.publish(payload)
      
      end

      Chef::Log.info("Posted converge history report")
      return

    rescue Exception => e
      if attempt < @amqp_config[:max_retries]
        delay = attempt * @amqp_config[:retry_delay]
        Chef::Log.error("Failed to post converge history report, retrying in #{delay} seconds...")
        sleep(delay)  # Sleep for a while if it's a transient communcation error then try again
      else
        trace = e.backtrace.join("\n")
        Chef::Log.error("Failed to post converge history report: #{e.message} #{trace}")
        return
      end

    ensure

      b.stop

    end
  end
end