Buffered logging to handle encoding conversion failures

DWIMlogging

  def flush
    @guard.synchronize do
      unless buffer.empty?
        old_buffer = buffer
        begin
          @log.write(old_buffer.join)
        rescue Encoding::UndefinedConversionError
          puts "Enc err"
          @log.write(old_buffer.map { |b| b.force_encoding(Encoding.default_internal) }.join)
          puts "Enc Done"
        end
      end

      # Important to do this even if buffer was empty or else @buffer will
      # accumulate empty arrays for each request where nothing was logged.
      clear_buffer
    end
  end