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# Copyright (C) 2013-2016 Kristoffer Gronlund <kgronlund@suse.com>
# See COPYING for license information.
"""
Helpers for handling log timestamps.
"""
import re
import time
import datetime
from . import utils
from . import log
logger = log.setup_logger(__name__)
YEAR = None
def set_year(ts=None):
'''
ts: optional time in seconds
'''
global YEAR
year = time.strftime("%Y", time.localtime(ts))
if YEAR is not None:
t = (" (ts: %s)" % (ts)) if ts is not None else ""
logger.debug("history: setting year to %s%s", year, t)
YEAR = year
def human_date(dt=None):
'''
Convert datetime argument into a presentational string.
dt: Datetime (default: now)
'''
if dt is None:
dt = utils.make_datetime_naive(datetime.datetime.now())
# here, dt is in UTC. Convert to localtime:
localdt = datetime.datetime.fromtimestamp(utils.datetime_to_timestamp(dt))
# drop microseconds
return re.sub("[.].*", "", "%s %s" % (localdt.date(), localdt.time()))
def make_time(t):
'''
t: time in seconds / datetime / other
returns: time in floating point
'''
if t is None:
return None
elif isinstance(t, datetime.datetime):
return utils.datetime_to_timestamp(t)
return t
# fmt1: group 11 is node
# fmt2: group 2 is node
# fmt3: group 2 is node
# fmt4: node not available?
_syslog2node_formats = (re.compile(r'^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:.(\d+))?([+-])(\d{2}):?(\d{2})\s+(?:\[\d+\])?\s*([\S]+)'),
re.compile(r'^(\d{4}-\d{2}-\d{2}T\S+)\s+(?:\[\d+\])?\s*([\S]+)'),
re.compile(r'^([a-zA-Z]{2,4}\s+\d{1,2}\s+\d{2}:\d{2}:\d{2})\s+(?:\[\d+\])?\s*([\S]+)'),
re.compile(r'^(\d{4}\/\d{2}\/\d{2}_\d{2}:\d{2}:\d{2})'),
re.compile(r'^([A-Z][a-z]+ \d{1,2} \d{2}:\d{2}:\d{2}\.\d+) ([\S]+)'))
_syslog_ts_prev = None
def syslog_ts(s):
"""
Finds the timestamp in the given line
Returns as floating point, seconds
"""
global _syslog_ts_prev
fmt1, fmt2, fmt3, fmt4, fm5 = _syslog2node_formats
# RFC3339
m = fmt1.match(s)
if m:
year, month, day, hour, minute, second, ms, tzsgn, tzh, tzm, _ = m.groups()
ts = time.mktime((int(year), int(month), int(day), int(hour), int(minute), int(second), 0, 0, -1))
if tzsgn == '+':
ts += (3600.0 * float(tzh) + 60.0 * float(tzm))
else:
ts -= (3600.0 * float(tzh) + 60.0 * float(tzm))
if ms:
ts += float("0.%s" % ms)
_syslog_ts_prev = ts
return _syslog_ts_prev
m = fmt2.match(s)
if m:
_syslog_ts_prev = utils.parse_to_timestamp(m.group(1))
return _syslog_ts_prev
m = fmt3.match(s)
if m:
if YEAR is None:
set_year()
tstr = YEAR + ' ' + m.group(1)
dt = datetime.datetime.strptime(tstr, '%Y %b %d %H:%M:%S')
from dateutil import tz
ts = utils.total_seconds(dt - tz.tzlocal().utcoffset(dt) - datetime.datetime(1970, 1, 1))
_syslog_ts_prev = ts
return _syslog_ts_prev
m = fmt4.match(s)
if m:
tstr = m.group(1).replace('_', ' ')
_syslog_ts_prev = utils.parse_to_timestamp(tstr)
return _syslog_ts_prev
m = fm5.match(s)
if m:
_syslog_ts_prev = utils.parse_to_timestamp(m.group(1))
return _syslog_ts_prev
logger.debug("malformed line: %s", s)
return _syslog_ts_prev
_syslog_node_prev = None
def syslog2node(s):
'''
Get the node from a syslog line.
old format:
Aug 14 11:07:04 <node> ...
new format:
Aug 14 11:07:04 [<PID>] <node> ...
RFC5424:
<TS> <node> ...
RFC5424 (2):
<TS> [<PID>] <node> ...
'''
global _syslog_node_prev
fmt1, fmt2, fmt3, _, _ = _syslog2node_formats
m = fmt1.match(s)
if m:
_syslog_node_prev = m.group(11)
return _syslog_node_prev
m = fmt2.match(s)
if m:
_syslog_node_prev = m.group(2)
return _syslog_node_prev
m = fmt3.match(s)
if m:
_syslog_node_prev = m.group(2)
return _syslog_node_prev
try:
# strptime defaults year to 1900 (sigh)
time.strptime(' '.join(s.split()[0:3]),
"%b %d %H:%M:%S")
_syslog_node_prev = s.split()[3]
return _syslog_node_prev
except ValueError: # try the rfc5424
ls = s.split()
if not ls:
return _syslog_node_prev
rfc5424 = s.split()[0]
if 'T' in rfc5424:
try:
utils.parse_to_timestamp(rfc5424)
_syslog_node_prev = s.split()[1]
return _syslog_node_prev
except Exception:
return _syslog_node_prev
else:
return _syslog_node_prev
def syslog_ts_node(s):
"""
Returns (timestamp, node) from a syslog log line
"""
global _syslog_ts_prev
global _syslog_node_prev
fmt1, fmt2, fmt3, fmt4, fmt5 = _syslog2node_formats
# RFC3339
m = fmt1.match(s)
if m:
year, month, day, hour, minute, second, ms, tzsgn, tzh, tzm, node = m.groups()
ts = time.mktime((int(year), int(month), int(day), int(hour), int(minute), int(second), 0, 0, -1))
if tzsgn == '+':
ts += (3600.0 * float(tzh) + 60.0 * float(tzm))
else:
ts -= (3600.0 * float(tzh) + 60.0 * float(tzm))
_syslog_ts_prev = ts
_syslog_node_prev = node
return _syslog_ts_prev, node
m = fmt2.match(s)
if m:
_syslog_ts_prev, _syslog_node_prev = utils.parse_to_timestamp(m.group(1)), m.group(2)
return _syslog_ts_prev, _syslog_node_prev
m = fmt3.match(s)
if m:
if YEAR is None:
set_year()
tstr = YEAR + ' ' + m.group(1)
dt = datetime.datetime.strptime(tstr, '%Y %b %d %H:%M:%S')
from dateutil import tz
ts = utils.total_seconds(dt - tz.tzlocal().utcoffset(dt) - datetime.datetime(1970, 1, 1))
_syslog_ts_prev, _syslog_node_prev = ts, m.group(2)
return _syslog_ts_prev, _syslog_node_prev
m = fmt4.match(s)
if m:
tstr = m.group(1).replace('_', ' ')
_syslog_ts_prev = utils.parse_to_timestamp(tstr)
return _syslog_ts_prev, _syslog_node_prev
m = fmt5.match(s)
if m:
_syslog_ts_prev, _syslog_node_prev = utils.parse_to_timestamp(m.group(1)), m.group(2)
return _syslog_ts_prev, _syslog_node_prev
logger.debug("malformed line: %s", s)
return _syslog_ts_prev, _syslog_node_prev
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