/usr/lib/python3/dist-packages/cronlog.py is in python3-crontab 1.9.3-2.
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# Copyright 2013, Martin Owens <doctormo@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import os
import re
import sys
import string
import codecs
import platform
py3 = platform.python_version()[0] == '3'
if py3:
unicode = str
from dateutil import parser as dateparse
MATCHER = r'(?P<date>\w+ +\d+ +\d\d:\d\d:\d\d) (?P<host>\w+) ' + \
r'CRON\[(?P<pid>\d+)\]: \((?P<user>\w+)\) CMD \((?P<cmd>.*)\)'
def size(filename):
return os.stat(filename)[6]
class LogReader(object):
"""Opens a Log file, reading backwards and watching for changes"""
def __init__(self, filename, mass=4096):
self.filename = filename
self.pipe = codecs.open(filename, 'r', encoding='utf-8')
self.mass = mass
self.size = -1
self.read = -1
def readlines(self, until=0):
"""Iterator for reading lines from a file backwards"""
if not self.pipe or self.pipe.closed:
raise IOError("Can't readline, no opened file.")
# Always seek to the end of the file, this accounts for file updates
# that happen during our running process.
self.size = size(self.filename)
block_num = 0
location = self.size
halfline = ''
while location > until:
location -= self.mass
mass = self.mass
if location < 0:
mass = self.mass + location
location = 0
self.pipe.seek(location)
line = self.pipe.read(mass) + halfline
data = line.split('\n')
if location != 0:
halfline = data.pop(0)
loc = location + mass
data.reverse()
for line in data:
if line.strip() == '':
continue
yield (loc, line)
loc -= len(line)
def __iter__(self):
for (offset, line) in self.readlines():
yield line
class CronLog(LogReader):
def __init__(self, filename='/var/log/syslog', user=None):
LogReader.__init__(self, filename)
self.user = user
def for_program(self, command):
return ProgramLog(self, command)
def __iter__(self):
for (offset, line) in self.readlines():
c = re.match(MATCHER, unicode(line))
datum = c and c.groupdict()
if datum and (not self.user or datum['user'] == self.user):
datum['date'] = dateparse.parse(datum['date'])
yield datum
class ProgramLog(object):
"""Specific log control for a single command/program"""
def __init__(self, log, command):
self.log = log
self.command = command
def __iter__(self):
for entry in self.log:
if entry['cmd'] == unicode(self.command):
yield entry
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