bin/djbdns-logparse

   1 #!/usr/bin/python3
   2 r"""
   3 Convert tinydns and dnscache logs to human-readable form
   4 """
   5 from argparse import ArgumentParser, FileType
   6 from djbdns.io import parse_logfile
   7
   8 # Create an argument parser using the file's docsctring as its
   9 # description.
  10 parser = ArgumentParser(description = __doc__)
  11
  12 # Parse zero or more positional arguments into a list of
  13 # "logfiles". If none are given, read from stdin instead.
  14 from sys import stdin
  15 parser.add_argument("logfiles",
  16                     metavar="LOGFILE",
  17                     type=FileType("r"),
  18                     nargs="*",
  19                     default=[stdin],
  20                     help="djbdns logfile to process (default: stdin)")
  21
  22 # Warning: argparse automatically opens its file arguments here,
  23 # and they only get closed when the program terminates. There's no
  24 # real benefit to closing them one-at-a-time after calling
  25 # parse_logfile(), because the "scarce" resource of open file
  26 # descriptors gets consumed immediately, before any processing has
  27 # happened. In other words, if you're going to run out of file
  28 # descriptors, it's going to happen right now.
  29 #
  30 # So anyway, don't run this on several million logfiles.
  31 args = parser.parse_args()
  32 for f in args.logfiles:
  33     parse_logfile(f)