Messing around w/ some metric logging

lager.rb

require 'logger'

require 'json'

class LagerFormatter < Logger::Formatter

  def self.call(severity, time, prg_name, message)
    defaults = {
      :severity => severity,
      :time     => time,
      :prg_name => prg_name
    }
    defaults.merge(message).to_json
  end
end

class Lager
  attr_reader :log

  def initialize
    @log = Logger.new(STDOUT)
    @log.datetime_format = "%FT%T%:z"
    @log.formatter = LagerFormatter
    @log.progname  = "cloud-control"
  end
end

class Transcript
  def initialize
    @log = Lager.new
  end

  def log_around(&block)
    start_time = Time.now
    yield
    end_time   = Time.now
    execution_time = end_time - start_time
    @log.log.debug({ :execution => execution_time, :message => "it worked" })
  end
end

transcript = Transcript.new

transcript.log_around do
  sleep 3
end