def test_generation_increment_race(self, cache):
"""
If two caching wrappers try to increment the same nonexistent
generation key at the same time, it should end up at 2, not 1.
"""
from ccui.core.cache import CachingHttpWrapper
wrapper = CachingHttpWrapper("wrapped", ["perms"], ["BucketName"])
# Simulate a second wrapper having won the race between failed incr and
# add by setting up the incr method to raise ValueError on first call
# and return 2 on second call, and the add method to return False (not
# added).
cache.add.return_value = False
def _incr(key, called=[]):
# intentionally using mutable default as collector
if called:
return 2
called.append(True)
raise ValueError("Key %r not found" % key)
cache.incr.side_effect = _incr
self.assertEqual(wrapper._next_generation("BucketName"), 2)
def test_generation_increment_success(self, cache):
from ccui.core.cache import CachingHttpWrapper
wrapper = CachingHttpWrapper("wrapped", ["perms"], ["BucketName"])
cache.incr.return_value = 3
self.assertEqual(wrapper._next_generation("BucketName"), 3)
def test_generation_increment_success(self, cache):
from ccui.core.cache import CachingHttpWrapper
wrapper = CachingHttpWrapper("wrapped", ["perms"], ["BucketName"])
cache.incr.return_value = 3
self.assertEqual(wrapper._next_generation("BucketName"), 3)
def make_request(self, **kwargs):
from ccui.core.cache import CachingHttpWrapper
res = Mock(["status"])
res.status = kwargs.pop("response_status", httplib.OK)
content = kwargs.pop("response_content", "content")
permissions = kwargs.pop("permissions", [])
buckets = kwargs.pop("cache_buckets", ["BucketName"])
dependent_buckets = kwargs.pop("cache_dependent_buckets", [])
with patch("ccui.core.api.Http") as http:
http.request.return_value = (res, content)
return CachingHttpWrapper(http, permissions, buckets,
dependent_buckets).request(**kwargs)
def test_generation_increment_race(self, cache):
"""
If two caching wrappers try to increment the same nonexistent
generation key at the same time, it should end up at 2, not 1.
"""
from ccui.core.cache import CachingHttpWrapper
wrapper = CachingHttpWrapper("wrapped", ["perms"], ["BucketName"])
# Simulate a second wrapper having won the race between failed incr and
# add by setting up the incr method to raise ValueError on first call
# and return 2 on second call, and the add method to return False (not
# added).
cache.add.return_value = False
def _incr(key, called=[]):
# intentionally using mutable default as collector
if called:
return 2
called.append(True)
raise ValueError("Key %r not found" % key)
cache.incr.side_effect = _incr
self.assertEqual(wrapper._next_generation("BucketName"), 2)
