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# This file is part of cloud-init. See LICENSE file for license information.
"""Tests for cloudinit.log """
import datetime
import io
import logging
import time
from cloudinit import log as ci_logging
from cloudinit.analyze.dump import CLOUD_INIT_ASCTIME_FMT
from tests.unittests.helpers import CiTestCase
class TestCloudInitLogger(CiTestCase):
def setUp(self):
# set up a logger like cloud-init does in setupLogging, but instead
# of sys.stderr, we'll plug in a StringIO() object so we can see
# what gets logged
logging.Formatter.converter = time.gmtime
self.ci_logs = io.StringIO()
self.ci_root = logging.getLogger()
console = logging.StreamHandler(self.ci_logs)
console.setFormatter(logging.Formatter(ci_logging.DEF_CON_FORMAT))
console.setLevel(ci_logging.DEBUG)
self.ci_root.addHandler(console)
self.ci_root.setLevel(ci_logging.DEBUG)
self.LOG = logging.getLogger("test_cloudinit_logger")
def test_logger_uses_gmtime(self):
"""Test that log message have timestamp in UTC (gmtime)"""
# Log a message, extract the timestamp from the log entry
# convert to datetime, and compare to a utc timestamp before
# and after the logged message.
# Due to loss of precision in the LOG timestamp, subtract and add
# time to the utc stamps for comparison
#
# utc_before: 2017-08-23 14:19:42.569299
# parsed dt : 2017-08-23 14:19:43.069000
# utc_after : 2017-08-23 14:19:43.570064
utc_before = datetime.datetime.utcnow() - datetime.timedelta(0, 0.5)
self.LOG.error("Test message")
utc_after = datetime.datetime.utcnow() + datetime.timedelta(0, 0.5)
# extract timestamp from log:
# 2017-08-23 14:19:43,069 - test_log.py[ERROR]: Test message
logstr = self.ci_logs.getvalue().splitlines()[0]
timestampstr = logstr.split(" - ")[0]
parsed_dt = datetime.datetime.strptime(
timestampstr, CLOUD_INIT_ASCTIME_FMT
)
self.assertLess(utc_before, parsed_dt)
self.assertLess(parsed_dt, utc_after)
self.assertLess(utc_before, utc_after)
self.assertGreater(utc_after, parsed_dt)
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