Paul Stewart | d956fa2 | 2011-05-23 13:11:06 -0700 | [diff] [blame] | 1 | #!/usr/bin/python |
| 2 | |
| 3 | # Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| 4 | # Use of this source code is governed by a BSD-style license that can be |
| 5 | # found in the LICENSE file. |
| 6 | |
| 7 | """ Return the time difference between two logfile entries |
| 8 | """ |
| 9 | |
| 10 | import logging |
| 11 | import optparse |
| 12 | import os |
| 13 | import re |
| 14 | import sys |
| 15 | import time |
| 16 | |
| 17 | logger = logging.getLogger('log_time_diff') |
| 18 | handler = logging.StreamHandler(file('/dev/stderr', 'w')) |
| 19 | formatter = logging.Formatter('\tlog_time_diff: %(levelname)s\t%(message)s') |
| 20 | handler.setFormatter(formatter) |
| 21 | logger.addHandler(handler) |
| 22 | |
| 23 | |
| 24 | class StampParser(object): |
| 25 | saved_msgs = '/var/tmp/messages.autotest_start' |
| 26 | def __init__(self, from_str, to_str, start = None): |
| 27 | self.from_re = re.compile(from_str) |
| 28 | self.to_re = re.compile(to_str) |
| 29 | self.start_line = None |
| 30 | self.end_line = None |
| 31 | if start: |
| 32 | self.start = self.syslog_to_float(start) |
| 33 | else: |
| 34 | if os.path.exists(self.saved_msgs): |
| 35 | for line in file(self.saved_msgs): |
| 36 | pass |
| 37 | self.start = self.syslog_to_float(line.split(' ')[0]) |
| 38 | |
| 39 | def parse_file(self, filename): |
| 40 | for line in file(filename): |
| 41 | if self.from_re.search(line): |
| 42 | self.end_line = None |
| 43 | self.start_line = line |
| 44 | if self.to_re.search(line): |
| 45 | self.end_line = line |
| 46 | |
| 47 | def syslog_to_float(self, syslog_time): |
| 48 | # Lines end up like 2011-05-13T07:38:05.238129-07:00 ... |
| 49 | date, sep, fraction = syslog_time.partition('.') |
| 50 | int_time = time.mktime(time.strptime(date, '%Y-%m-%dT%H:%M:%S')) |
Paul Stewart | ca77b11 | 2011-06-22 13:01:15 -0700 | [diff] [blame] | 51 | return float('%d.%s' % (int_time, re.split('[+-]', fraction)[0])) |
Paul Stewart | d956fa2 | 2011-05-23 13:11:06 -0700 | [diff] [blame] | 52 | |
| 53 | def results(self): |
| 54 | if not self.start_line or not self.end_line: |
| 55 | logger.error('Could not find strings in file') |
| 56 | return '-' |
| 57 | |
| 58 | logger.debug('Start line: %s', self.start_line) |
| 59 | logger.debug('End line: %s', self.end_line) |
| 60 | |
| 61 | syslog_from = self.start_line.split(' ')[0] |
| 62 | syslog_from_time = self.syslog_to_float(syslog_from) |
| 63 | if self.start and syslog_from_time < self.start: |
| 64 | logger.error('Search string only appears before start time!') |
| 65 | return '-' |
| 66 | |
| 67 | from_match = re.search('kernel:\s*\[\s*([0-9.]*)', self.start_line) |
| 68 | to_match = re.search('kernel:\s*\[\s*([0-9.]*)', self.end_line) |
| 69 | if from_match and to_match: |
| 70 | # Lines end up like <syslog time> host kernel: [1307112.080338] ... |
| 71 | logger.info('Using kernel timestamp %s %s' % |
| 72 | (from_match.group(1), to_match.group(1))) |
| 73 | from_time = float(from_match.group(1)) |
| 74 | to_time = float(to_match.group(1)) |
| 75 | else: |
| 76 | syslog_to = self.end_line.split(' ')[0] |
| 77 | logger.info('Using syslog timestamp %s %s' % |
| 78 | (syslog_from, syslog_to)) |
| 79 | from_time = syslog_from_time |
| 80 | to_time = self.syslog_to_float(syslog_to) |
| 81 | return (to_time - from_time) |
| 82 | |
| 83 | |
| 84 | def main(argv): |
| 85 | parser = optparse.OptionParser('Usage: %prog [options...]') |
| 86 | parser.add_option('--from', dest='from_str', |
| 87 | help='First regexp to search for') |
| 88 | parser.add_option('--to', dest='to_str', |
| 89 | help='Second regexp to search for') |
| 90 | parser.add_option('--file', dest='file', default='/var/log/messages', |
| 91 | help='File to search for regexps in') |
| 92 | parser.add_option('--no-rotate', dest='no_rotate', action='store_true', |
| 93 | help='Do not search in file.1 for the same expression') |
| 94 | parser.add_option('--start', dest='start', |
| 95 | help='Do not accept events that start before this time') |
| 96 | parser.add_option('--debug', dest='debug', action='store_true', |
| 97 | help='Show extra verbose messages') |
| 98 | (options, args) = parser.parse_args(argv[1:]) |
| 99 | |
| 100 | if not options.from_str or not options.to_str: |
| 101 | parser.error('Required arguments: --from=<from_re> --to=<to_re>') |
| 102 | |
| 103 | |
| 104 | if options.debug: |
| 105 | logger.setLevel(logging.DEBUG) |
| 106 | else: |
| 107 | logger.setLevel(logging.INFO) |
| 108 | |
| 109 | parser = StampParser(options.from_str, options.to_str, options.start) |
| 110 | |
| 111 | # If file rotation is enabled, try to parse previous file |
| 112 | if not options.no_rotate: |
| 113 | rotate_file = '%s.1' % options.file |
| 114 | if os.path.exists(rotate_file): |
| 115 | parser.parse_file(rotate_file) |
| 116 | |
| 117 | parser.parse_file(options.file) |
| 118 | print parser.results() |
| 119 | |
| 120 | if __name__ == '__main__': |
| 121 | main(sys.argv) |