def test_instantiation_with_redis_info(self):
"""A Redis client must be initialized if connection info is provided"""
lock = downloaders.DownloadLock('url',
2,
redis_host='test',
redis_port=6379)
self.assertIsInstance(lock.redis, Redis)
def test_acquired_if_max_downloads_is_none(self):
"""The lock must be acquired if there is the max_downloads is left as None"""
lock = downloaders.DownloadLock('url',
None,
redis_host='test',
redis_port=6379)
with mock.patch('geospaas_processing.downloaders.Redis.eval'):
self.assertTrue(lock.__enter__())
def test_locked_if_increment_returns_none(self):
"""`__enter__` must return False if the increment script returns None"""
lock = downloaders.DownloadLock('url',
2,
redis_host='test',
redis_port=6379)
with mock.patch('geospaas_processing.downloaders.Redis.eval',
return_value=None):
self.assertFalse(lock.__enter__())
def test_acquired_if_increment_returns_int(self):
"""`__enter__` must return True if the increment script doesn't return None"""
lock = downloaders.DownloadLock('url',
2,
redis_host='test',
redis_port=6379)
with mock.patch('geospaas_processing.downloaders.Redis.eval',
return_value=1):
self.assertTrue(lock.__enter__())
def test_no_decrement_if_not_redis_and_acquired(self):
"""
The download count must not be decremented if redis is unavailable,
even if the lock was acquired
"""
lock = downloaders.DownloadLock('url', 2)
lock.acquired = True
with mock.patch(
'geospaas_processing.downloaders.Redis.eval') as mock_eval:
lock.__exit__()
mock_eval.assert_not_called()
def test_decrement_if_redis_and_acquired(self):
"""The download count must be decremented if redis is available and the lock was acquired"""
lock = downloaders.DownloadLock('url',
2,
redis_host='test',
redis_port=6379)
lock.acquired = True
with mock.patch(
'geospaas_processing.downloaders.Redis.eval') as mock_eval:
lock.__exit__()
mock_eval.assert_called_with(lock.DECREMENT_SCRIPT, 1,
lock.CURRENT_DOWNLOADS_KEY, 'url')
def test_no_decrement_if_redis_and_not_acquired(self):
"""
The download count must not be decremented if redis is available
but the lock was not acquired
"""
lock = downloaders.DownloadLock('url',
2,
redis_host='test',
redis_port=6379)
lock.acquired = False
with mock.patch(
'geospaas_processing.downloaders.Redis.eval') as mock_eval:
lock.__exit__()
mock_eval.assert_not_called()
def test_always_acquired_if_no_redis(self):
"""`__enter__` must return True if no Redis connection info is provided"""
lock = downloaders.DownloadLock('url', 2)
self.assertTrue(lock.__enter__())
def test_instantiation_without_redis_info(self):
"""The redis attribute must be set to None if no connection info is provided"""
lock = downloaders.DownloadLock('url', 2)
self.assertIsNone(lock.redis)