Tracing a Ruby app

tracing.rb

# Ruby 1.9 using #set_trace_func
trace_log = '/application/log/trace.log'
File.write(trace_log, "#{'#'*150}\n"*5)
set_trace_func proc { |event, file, line, id, binding, classname|
    unless file.include?('/usr/') || file.include?('/opt/')
        LAST_FUNC ||= {}
        unless LAST_FUNC[:id] == id && LAST_FUNC[:classname] = classname
            file = file.sub('/application/', '')
            file_line = "#{file}:#{line}"
            string_format = "%-55s %20s  %-60s\n"
            File.open(trace_log, 'a') { |f|
                f.printf(string_format, file_line, id, classname)
            }
            printf(string_format, file_line, id, classname)
        end
        LAST_FUNC[:id] = id
        LAST_FUNC[:classname] = classname
    end
}

# Ruby 1.9 using TracePoint
require 'tracepoint'

TracePoint.trace do |tp|
    pp tp.methods.sort
  exit
  puts "#{tp.self.class}\t#{tp.callee}\t#{tp.event}\t#{tp.return?}"
end
TracePoint.activate