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import random
from units.compat import unittest
from ansible.module_utils.cloud import _exponential_backoff, \
_full_jitter_backoff
class ExponentialBackoffStrategyTestCase(unittest.TestCase):
def test_no_retries(self):
strategy = _exponential_backoff(retries=0)
result = list(strategy())
self.assertEquals(result, [], 'list should be empty')
def test_exponential_backoff(self):
strategy = _exponential_backoff(retries=5, delay=1, backoff=2)
result = list(strategy())
self.assertEquals(result, [1, 2, 4, 8, 16])
def test_max_delay(self):
strategy = _exponential_backoff(retries=7, delay=1, backoff=2, max_delay=60)
result = list(strategy())
self.assertEquals(result, [1, 2, 4, 8, 16, 32, 60])
def test_max_delay_none(self):
strategy = _exponential_backoff(retries=7, delay=1, backoff=2, max_delay=None)
result = list(strategy())
self.assertEquals(result, [1, 2, 4, 8, 16, 32, 64])
class FullJitterBackoffStrategyTestCase(unittest.TestCase):
def test_no_retries(self):
strategy = _full_jitter_backoff(retries=0)
result = list(strategy())
self.assertEquals(result, [], 'list should be empty')
def test_full_jitter(self):
retries = 5
seed = 1
r = random.Random(seed)
expected = [r.randint(0, 2**i) for i in range(0, retries)]
strategy = _full_jitter_backoff(
retries=retries, delay=1, _random=random.Random(seed))
result = list(strategy())
self.assertEquals(result, expected)
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