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# Copyright (c) 2021 NVIDIA
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import unittest
import mock
from time import time
from swift.common.error_limiter import ErrorLimiter
from test.unit import FakeRing
class TestErrorLimiter(unittest.TestCase):
def setUp(self):
self.ring = FakeRing()
def test_init_config(self):
config = {'suppression_interval': 100.9,
'suppression_limit': 5}
limiter = ErrorLimiter(**config)
self.assertEqual(limiter.suppression_interval, 100.9)
self.assertEqual(limiter.suppression_limit, 5)
config = {'suppression_interval': '100.9',
'suppression_limit': '5'}
limiter = ErrorLimiter(**config)
self.assertEqual(limiter.suppression_interval, 100.9)
self.assertEqual(limiter.suppression_limit, 5)
def test_init_bad_config(self):
with self.assertRaises(ValueError):
ErrorLimiter(suppression_interval='bad',
suppression_limit=1)
with self.assertRaises(TypeError):
ErrorLimiter(suppression_interval=None,
suppression_limit=1)
with self.assertRaises(ValueError):
ErrorLimiter(suppression_interval=0,
suppression_limit='bad')
with self.assertRaises(TypeError):
ErrorLimiter(suppression_interval=0,
suppression_limit=None)
def test_is_limited(self):
node = self.ring.devs[-1]
limiter = ErrorLimiter(suppression_interval=60, suppression_limit=10)
now = time()
with mock.patch('swift.common.error_limiter.time', return_value=now):
self.assertFalse(limiter.is_limited(node))
limiter.limit(node)
self.assertTrue(limiter.is_limited(node))
node_key = limiter.node_key(node)
self.assertEqual(limiter.stats.get(node_key),
{'errors': limiter.suppression_limit + 1,
'last_error': now})
def test_increment(self):
node = self.ring.devs[-1]
limiter = ErrorLimiter(suppression_interval=60, suppression_limit=10)
node_key = limiter.node_key(node)
for i in range(limiter.suppression_limit):
self.assertFalse(limiter.increment(node))
self.assertEqual(i + 1, limiter.stats.get(node_key)['errors'])
self.assertFalse(limiter.is_limited(node))
# A few more to make sure it is > suppression_limit
for i in range(1, 4):
self.assertTrue(limiter.increment(node))
self.assertEqual(limiter.suppression_limit + i,
limiter.stats.get(node_key)['errors'])
self.assertTrue(limiter.is_limited(node))
# Simulate time with no errors have gone by.
last_time = limiter.stats.get(node_key)['last_error']
now = last_time + limiter.suppression_interval + 1
with mock.patch('swift.common.error_limiter.time',
return_value=now):
self.assertFalse(limiter.is_limited(node))
self.assertFalse(limiter.stats.get(node_key))
def test_node_key(self):
limiter = ErrorLimiter(suppression_interval=60, suppression_limit=10)
node = self.ring.devs[0]
expected = '%s:%s/%s' % (node['ip'], node['port'], node['device'])
self.assertEqual(expected, limiter.node_key(node))
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