Question

I’m maintaining an old asp classic application. It uses Response.AppendToLog as its sole debug logging system. I only debug it on my localhost so the logging files are on my harddrive in the %SystemDrive%\inetpub\logs\LogFiles folder.

I’m looking for a tail-like program that shows these debug messages live. Maybe with a possibility to colour the messages based on a filter.

Update: I’ve started writing my own tail program in python using the info in Recipe 157035. The logging lags behind by a minute approximately. Any ideas on improving it?

Answer 1

I finished it. Now all I have to do is Response.AppendToLog('#message'); where every space or weird character in message is replaced by an underscore. Too bad it lags behind by a minute or so, but it’s better than nothing.

import time, os, re  def tail_f(file):     interval = 1.0      while True:         where = file.tell()         line = file.readline()         if not line:             time.sleep(interval)             file.seek(where)         else:             yield line  def run():     #Set the filename and open the file     filename = r'C:\inetpub\logs\LogFiles\W3SVC1\u_ex{0}.log'.format(time.strftime('%y%m%d'))     file = open(filename,'r')      #Find the size of the file and move to the end     st_results = os.stat(filename)     st_size = st_results[6]     file.seek(st_size)      for line in tail_f(file):         #ignore comments         if line[0] != '#':             line = line.strip()             parts = line.split(' ')              status = parts[10]             if status == '304':                 continue              when = parts[1]             method = parts[3]             path = parts[4]             query = parts[5].split('|')[0].split('#')[0]              if query == '-':                 query = ''             elif query != '':                 query = '?'+query              print when, method[0], status, path + query              if status == '500':                 if parts[5].find('|') != -1:                     errorparts = parts[5].replace('_', ' ').split('|')[1:]                     linenr = errorparts[0]                     errornr = errorparts[1]                     errormessage = errorparts[2]                     print 'Error {0} on line {1}\n{2}'.format(errornr, linenr, errormessage)             if parts[5].find('#') != -1:                 print '* '+('\n* '.join(parts[5].replace('_', ' ').split('#')[1:]))  run()