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gh-88352: Make TimedRotatingFileHandler tests more stable by serhiy-storchaka · Pull Request #116409 · python/cpython · GitHub

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gh-88352: Make TimedRotatingFileHandler tests more stable #116409

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serhiy-storchaka merged 2 commits into from
Mar 11, 2024
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gh-88352: Make TimedRotatingFileHandler tests more stable #116409

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gh-88352: Make TimedRotatingFileHandler tests more stable
serhiy-storchaka Mar 6, 2024
d9f6c99
Share code between test_rollover_at_midnight and test_rollover_at_wee…
serhiy-storchaka Mar 11, 2024
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gh-88352: Make TimedRotatingFileHandler tests more stable 
The tests failed (with less than 1% probability) if for example the file
was created at 11:46:03.999, but the record was emitted at 11:46:04.001,
with atTime=11:46:04, which caused an unexpected rollover. Ensure that the
tests are always run within the range of the same whole second.
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serhiy-storchaka committed Mar 6, 2024
commit 8f7b2aa34f95c0d59a1d1d977b8cc3edcc1a626d
27 changes: 22 additions & 5 deletions Lib/test/test_logging.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6081,7 +6081,16 @@ def test_rollover(self):
self.assertTrue(found, msg=msg)

def test_rollover_at_midnight(self):
atTime = datetime.datetime.now().time()
os_helper.unlink(self.fn)
now = datetime.datetime.now()
atTime = now.time()
if not 0.1 < atTime.microsecond/1e6 < 0.9:
# The test requires all records to be emitted within
# the range of the same whole second.
time.sleep((0.1 - atTime.microsecond/1e6) % 1.0)
now = datetime.datetime.now()
atTime = now.time()
atTime = atTime.replace(microsecond=0)
fmt = logging.Formatter('%(asctime)s %(message)s')
for i in range(3):
fh = logging.handlers.TimedRotatingFileHandler(
Expand All @@ -6095,15 +6104,15 @@ def test_rollover_at_midnight(self):
for i, line in enumerate(f):
self.assertIn(f'testing1 {i}', line)

os.utime(self.fn, (time.time() - 1,)*2)
os.utime(self.fn, (now.timestamp() - 1,)*2)
for i in range(2):
fh = logging.handlers.TimedRotatingFileHandler(
self.fn, encoding="utf-8", when='MIDNIGHT', atTime=atTime)
fh.setFormatter(fmt)
r2 = logging.makeLogRecord({'msg': f'testing2 {i}'})
fh.emit(r2)
fh.close()
rolloverDate = datetime.datetime.now() - datetime.timedelta(days=1)
rolloverDate = now - datetime.timedelta(days=1)
otherfn = f'{self.fn}.{rolloverDate:%Y-%m-%d}'
self.assertLogFile(otherfn)
with open(self.fn, encoding="utf-8") as f:
Expand All @@ -6114,8 +6123,16 @@ def test_rollover_at_midnight(self):
self.assertIn(f'testing1 {i}', line)

def test_rollover_at_weekday(self):
os_helper.unlink(self.fn)
now = datetime.datetime.now()
atTime = now.time()
if not 0.1 < atTime.microsecond/1e6 < 0.9:
# The test requires all records to be emitted within
# the range of the same whole second.
time.sleep((0.1 - atTime.microsecond/1e6) % 1.0)
now = datetime.datetime.now()
atTime = now.time()
atTime = atTime.replace(microsecond=0)
fmt = logging.Formatter('%(asctime)s %(message)s')
for i in range(3):
fh = logging.handlers.TimedRotatingFileHandler(
Expand All @@ -6129,15 +6146,15 @@ def test_rollover_at_weekday(self):
for i, line in enumerate(f):
self.assertIn(f'testing1 {i}', line)

os.utime(self.fn, (time.time() - 1,)*2)
os.utime(self.fn, (now.timestamp() - 1,)*2)
for i in range(2):
fh = logging.handlers.TimedRotatingFileHandler(
self.fn, encoding="utf-8", when=f'W{now.weekday()}', atTime=atTime)
fh.setFormatter(fmt)
r2 = logging.makeLogRecord({'msg': f'testing2 {i}'})
fh.emit(r2)
fh.close()
rolloverDate = datetime.datetime.now() - datetime.timedelta(days=7)
rolloverDate = now - datetime.timedelta(days=7)
otherfn = f'{self.fn}.{rolloverDate:%Y-%m-%d}'
self.assertLogFile(otherfn)
with open(self.fn, encoding="utf-8") as f:
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