Formatter for standard lib logger

formatter.rb

# storage on lib/gasper/logger/formatter.rb
# Usage
#   LOGGER = Logger.new('log/development.log', 'daily')
#   LOGGER.formatter = Gasper::Logger::Formatter.new
#   LOGGER.progname = 'mongodb-json-proxy'
#
module Gasper
  module Logger
    class Formatter
      # YYYY:MM:DD HH:MM:SS.MS progname(pid) level: message
      @format = "%s %s(%d) [%s] %s\n"

      class << self
        attr_accessor :format
      end

      def call(severity, time, progname, msg)
        self.class.format % [ format_time( time ), progname, $$, severity, msg.to_s ]
      end

      private

      def format_time( time )
        time.strftime( "%Y-%m-%d %H:%M:%S." ) + time.usec.to_s
      end
    end
  end
end