optools/lib/python/logger.py

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2018-04-28 07:59:30 -04:00
#!/usr/bin/env python3
# The logfile.
dflt_logfile = '/var/log/optools/optools.log'
# The default log level. Can be one of (in increasing levels of output):
# critical
# error
# warning
# info
# debug
# "debug" may log sensitive information! Do *not* use it unless ABSOLUTELY
# NECESSARY.
dflt_loglevel = 'warning'
# stdlib
import datetime
import logging
import logging.handlers
import os
class log(object):
def __init__(self, loglvl = dflt_loglevel, logfile = dflt_logfile,
logname = 'optools'):
# Loglevel mappings.
self.loglvls = {'critical': logging.CRITICAL,
'error': logging.ERROR,
'warning': logging.WARNING,
'info': logging.INFO,
'debug': logging.DEBUG}
self.loglvl = loglvl.lower()
if self.loglvl not in self.loglvls:
raise ValueError(('{0} is not one of: ' +
'{1}').format(loglvl,
', '.join(self.loglvls.keys())))
self.Logger = logging.getLogger(logname)
self.logfile = os.path.abspath(os.path.expanduser(logfile))
try:
os.makedirs(os.path.dirname(self.logfile),
exist_ok = True,
mode = 0o700)
except Exception as e:
# Make this non-fatal since we also log to journal for systemd?
raise e
self.systemd()
self.journald()
self.Logger.setLevel(self.loglvls[self.loglvl])
self.log_handlers()
def systemd(self):
# Add journald support if we're on systemd.
# We probably are since we're most likely on Arch, but we don't want to
# make assumptions.
self.systemd = False
_sysd_chk = ['/run/systemd/system',
'/dev/.run/systemd',
'/dev/.systemd']
for _ in _sysd_chk:
if os.path.isdir(_):
self.systemd = True
break
return()
def journald(self):
if not self.systemd:
return()
try:
from systemd import journal
except ImportError:
try:
import pip
pip.main(['install', '--user', 'systemd'])
from systemd import journal
except Exception as e:
# Build failed. Missing gcc, disk too full, whatever.
self.systemd = False
return()
def log_handlers(self):
# Log formats
if self.systemd:
_jrnlfmt = logging.Formatter(fmt = ('{levelname}: {message} ' +
'({filename}:{lineno})'),
style = '{',
datefmt = '%Y-%m-%d %H:%M:%S')
_logfmt = logging.Formatter(fmt = ('{asctime}:{levelname}: {message} (' +
'{filename}:{lineno})'),
style = '{',
datefmt = '%Y-%m-%d %H:%M:%S')
# Add handlers
_dflthandler = logging.handlers.RotatingFileHandler(self.logfile,
encoding = 'utf8',
# 1GB
maxBytes = 1073741824,
backupCount = 5)
_dflthandler.setFormatter(_logfmt)
_dflthandler.setLevel(self.loglvls[self.loglvl])
if self.systemd:
from systemd import journal
try:
h = journal.JournaldLogHandler()
except AttributeError: # Uses the other version
h = journal.JournalHandler()
h.setFormatter(_jrnlfmt)
h.setLevel(self.loglvls[self.loglvl])
self.Logger.addHandler(h)
self.Logger.addHandler(_dflthandler)
self.Logger.info('Logging initialized')
return()