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django/tests/regressiontests/cache/tests.py

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# -*- coding: utf-8 -*-
# Unit tests for cache framework
# Uses whatever cache backend is set in the test settings file.
import os
import tempfile
import time
import warnings
from django.conf import settings
from django.core import management
from django.core.cache import get_cache, DEFAULT_CACHE_ALIAS
from django.core.cache.backends.base import CacheKeyWarning
from django.http import HttpResponse, HttpRequest
from django.middleware.cache import FetchFromCacheMiddleware, UpdateCacheMiddleware, CacheMiddleware
from django.test import RequestFactory, TestCase
from django.test.utils import get_warnings_state, restore_warnings_state
from django.utils import translation
from django.utils import unittest
from django.utils.cache import patch_vary_headers, get_cache_key, learn_cache_key
from django.utils.hashcompat import md5_constructor
from django.views.decorators.cache import cache_page
from regressiontests.cache.models import Poll, expensive_calculation
# functions/classes for complex data type tests
def f():
return 42
class C:
def m(n):
return 24
class DummyCacheTests(unittest.TestCase):
# The Dummy cache backend doesn't really behave like a test backend,
# so it has different test requirements.
def setUp(self):
self.cache = get_cache('django.core.cache.backends.dummy.DummyCache')
def test_simple(self):
"Dummy cache backend ignores cache set calls"
self.cache.set("key", "value")
self.assertEqual(self.cache.get("key"), None)
def test_add(self):
"Add doesn't do anything in dummy cache backend"
self.cache.add("addkey1", "value")
result = self.cache.add("addkey1", "newvalue")
self.assertEqual(result, True)
self.assertEqual(self.cache.get("addkey1"), None)
def test_non_existent(self):
"Non-existent keys aren't found in the dummy cache backend"
self.assertEqual(self.cache.get("does_not_exist"), None)
self.assertEqual(self.cache.get("does_not_exist", "bang!"), "bang!")
def test_get_many(self):
"get_many returns nothing for the dummy cache backend"
self.cache.set('a', 'a')
self.cache.set('b', 'b')
self.cache.set('c', 'c')
self.cache.set('d', 'd')
self.assertEqual(self.cache.get_many(['a', 'c', 'd']), {})
self.assertEqual(self.cache.get_many(['a', 'b', 'e']), {})
def test_delete(self):
"Cache deletion is transparently ignored on the dummy cache backend"
self.cache.set("key1", "spam")
self.cache.set("key2", "eggs")
self.assertEqual(self.cache.get("key1"), None)
self.cache.delete("key1")
self.assertEqual(self.cache.get("key1"), None)
self.assertEqual(self.cache.get("key2"), None)
def test_has_key(self):
"The has_key method doesn't ever return True for the dummy cache backend"
self.cache.set("hello1", "goodbye1")
self.assertEqual(self.cache.has_key("hello1"), False)
self.assertEqual(self.cache.has_key("goodbye1"), False)
def test_in(self):
"The in operator doesn't ever return True for the dummy cache backend"
self.cache.set("hello2", "goodbye2")
self.assertEqual("hello2" in self.cache, False)
self.assertEqual("goodbye2" in self.cache, False)
def test_incr(self):
"Dummy cache values can't be incremented"
self.cache.set('answer', 42)
self.assertRaises(ValueError, self.cache.incr, 'answer')
self.assertRaises(ValueError, self.cache.incr, 'does_not_exist')
def test_decr(self):
"Dummy cache values can't be decremented"
self.cache.set('answer', 42)
self.assertRaises(ValueError, self.cache.decr, 'answer')
self.assertRaises(ValueError, self.cache.decr, 'does_not_exist')
def test_data_types(self):
"All data types are ignored equally by the dummy cache"
stuff = {
'string' : 'this is a string',
'int' : 42,
'list' : [1, 2, 3, 4],
'tuple' : (1, 2, 3, 4),
'dict' : {'A': 1, 'B' : 2},
'function' : f,
'class' : C,
}
self.cache.set("stuff", stuff)
self.assertEqual(self.cache.get("stuff"), None)
def test_expiration(self):
"Expiration has no effect on the dummy cache"
self.cache.set('expire1', 'very quickly', 1)
self.cache.set('expire2', 'very quickly', 1)
self.cache.set('expire3', 'very quickly', 1)
time.sleep(2)
self.assertEqual(self.cache.get("expire1"), None)
self.cache.add("expire2", "newvalue")
self.assertEqual(self.cache.get("expire2"), None)
self.assertEqual(self.cache.has_key("expire3"), False)
def test_unicode(self):
"Unicode values are ignored by the dummy cache"
stuff = {
u'ascii': u'ascii_value',
u'unicode_ascii': u'Iñtërnâtiônàlizætiøn1',
u'Iñtërnâtiônàlizætiøn': u'Iñtërnâtiônàlizætiøn2',
u'ascii': {u'x' : 1 }
}
for (key, value) in stuff.items():
self.cache.set(key, value)
self.assertEqual(self.cache.get(key), None)
def test_set_many(self):
"set_many does nothing for the dummy cache backend"
self.cache.set_many({'a': 1, 'b': 2})
def test_delete_many(self):
"delete_many does nothing for the dummy cache backend"
self.cache.delete_many(['a', 'b'])
def test_clear(self):
"clear does nothing for the dummy cache backend"
self.cache.clear()
def test_incr_version(self):
"Dummy cache versions can't be incremented"
self.cache.set('answer', 42)
self.assertRaises(ValueError, self.cache.incr_version, 'answer')
self.assertRaises(ValueError, self.cache.incr_version, 'does_not_exist')
def test_decr_version(self):
"Dummy cache versions can't be decremented"
self.cache.set('answer', 42)
self.assertRaises(ValueError, self.cache.decr_version, 'answer')
self.assertRaises(ValueError, self.cache.decr_version, 'does_not_exist')
class BaseCacheTests(object):
# A common set of tests to apply to all cache backends
def test_simple(self):
# Simple cache set/get works
self.cache.set("key", "value")
self.assertEqual(self.cache.get("key"), "value")
def test_add(self):
# A key can be added to a cache
self.cache.add("addkey1", "value")
result = self.cache.add("addkey1", "newvalue")
self.assertEqual(result, False)
self.assertEqual(self.cache.get("addkey1"), "value")
def test_prefix(self):
# Test for same cache key conflicts between shared backend
self.cache.set('somekey', 'value')
# should not be set in the prefixed cache
self.assertFalse(self.prefix_cache.has_key('somekey'))
self.prefix_cache.set('somekey', 'value2')
self.assertEqual(self.cache.get('somekey'), 'value')
self.assertEqual(self.prefix_cache.get('somekey'), 'value2')
def test_non_existent(self):
# Non-existent cache keys return as None/default
# get with non-existent keys
self.assertEqual(self.cache.get("does_not_exist"), None)
self.assertEqual(self.cache.get("does_not_exist", "bang!"), "bang!")
def test_get_many(self):
# Multiple cache keys can be returned using get_many
self.cache.set('a', 'a')
self.cache.set('b', 'b')
self.cache.set('c', 'c')
self.cache.set('d', 'd')
self.assertEqual(self.cache.get_many(['a', 'c', 'd']), {'a' : 'a', 'c' : 'c', 'd' : 'd'})
self.assertEqual(self.cache.get_many(['a', 'b', 'e']), {'a' : 'a', 'b' : 'b'})
def test_delete(self):
# Cache keys can be deleted
self.cache.set("key1", "spam")
self.cache.set("key2", "eggs")
self.assertEqual(self.cache.get("key1"), "spam")
self.cache.delete("key1")
self.assertEqual(self.cache.get("key1"), None)
self.assertEqual(self.cache.get("key2"), "eggs")
def test_has_key(self):
# The cache can be inspected for cache keys
self.cache.set("hello1", "goodbye1")
self.assertEqual(self.cache.has_key("hello1"), True)
self.assertEqual(self.cache.has_key("goodbye1"), False)
def test_in(self):
# The in operator can be used to inspet cache contents
self.cache.set("hello2", "goodbye2")
self.assertEqual("hello2" in self.cache, True)
self.assertEqual("goodbye2" in self.cache, False)
def test_incr(self):
# Cache values can be incremented
self.cache.set('answer', 41)
self.assertEqual(self.cache.incr('answer'), 42)
self.assertEqual(self.cache.get('answer'), 42)
self.assertEqual(self.cache.incr('answer', 10), 52)
self.assertEqual(self.cache.get('answer'), 52)
self.assertRaises(ValueError, self.cache.incr, 'does_not_exist')
def test_decr(self):
# Cache values can be decremented
self.cache.set('answer', 43)
self.assertEqual(self.cache.decr('answer'), 42)
self.assertEqual(self.cache.get('answer'), 42)
self.assertEqual(self.cache.decr('answer', 10), 32)
self.assertEqual(self.cache.get('answer'), 32)
self.assertRaises(ValueError, self.cache.decr, 'does_not_exist')
def test_data_types(self):
# Many different data types can be cached
stuff = {
'string' : 'this is a string',
'int' : 42,
'list' : [1, 2, 3, 4],
'tuple' : (1, 2, 3, 4),
'dict' : {'A': 1, 'B' : 2},
'function' : f,
'class' : C,
}
self.cache.set("stuff", stuff)
self.assertEqual(self.cache.get("stuff"), stuff)
def test_cache_read_for_model_instance(self):
# Don't want fields with callable as default to be called on cache read
expensive_calculation.num_runs = 0
Poll.objects.all().delete()
my_poll = Poll.objects.create(question="Well?")
self.assertEqual(Poll.objects.count(), 1)
pub_date = my_poll.pub_date
self.cache.set('question', my_poll)
cached_poll = self.cache.get('question')
self.assertEqual(cached_poll.pub_date, pub_date)
# We only want the default expensive calculation run once
self.assertEqual(expensive_calculation.num_runs, 1)
def test_cache_write_for_model_instance_with_deferred(self):
# Don't want fields with callable as default to be called on cache write
expensive_calculation.num_runs = 0
Poll.objects.all().delete()
my_poll = Poll.objects.create(question="What?")
self.assertEqual(expensive_calculation.num_runs, 1)
defer_qs = Poll.objects.all().defer('question')
self.assertEqual(defer_qs.count(), 1)
self.assertEqual(expensive_calculation.num_runs, 1)
self.cache.set('deferred_queryset', defer_qs)
# cache set should not re-evaluate default functions
self.assertEqual(expensive_calculation.num_runs, 1)
def test_cache_read_for_model_instance_with_deferred(self):
# Don't want fields with callable as default to be called on cache read
expensive_calculation.num_runs = 0
Poll.objects.all().delete()
my_poll = Poll.objects.create(question="What?")
self.assertEqual(expensive_calculation.num_runs, 1)
defer_qs = Poll.objects.all().defer('question')
self.assertEqual(defer_qs.count(), 1)
self.cache.set('deferred_queryset', defer_qs)
self.assertEqual(expensive_calculation.num_runs, 1)
runs_before_cache_read = expensive_calculation.num_runs
cached_polls = self.cache.get('deferred_queryset')
# We only want the default expensive calculation run on creation and set
self.assertEqual(expensive_calculation.num_runs, runs_before_cache_read)
def test_expiration(self):
# Cache values can be set to expire
self.cache.set('expire1', 'very quickly', 1)
self.cache.set('expire2', 'very quickly', 1)
self.cache.set('expire3', 'very quickly', 1)
time.sleep(2)
self.assertEqual(self.cache.get("expire1"), None)
self.cache.add("expire2", "newvalue")
self.assertEqual(self.cache.get("expire2"), "newvalue")
self.assertEqual(self.cache.has_key("expire3"), False)
def test_unicode(self):
# Unicode values can be cached
stuff = {
u'ascii': u'ascii_value',
u'unicode_ascii': u'Iñtërnâtiônàlizætiøn1',
u'Iñtërnâtiônàlizætiøn': u'Iñtërnâtiônàlizætiøn2',
u'ascii': {u'x' : 1 }
}
for (key, value) in stuff.items():
self.cache.set(key, value)
self.assertEqual(self.cache.get(key), value)
def test_binary_string(self):
# Binary strings should be cachable
from zlib import compress, decompress
value = 'value_to_be_compressed'
compressed_value = compress(value)
self.cache.set('binary1', compressed_value)
compressed_result = self.cache.get('binary1')
self.assertEqual(compressed_value, compressed_result)
self.assertEqual(value, decompress(compressed_result))
def test_set_many(self):
# Multiple keys can be set using set_many
self.cache.set_many({"key1": "spam", "key2": "eggs"})
self.assertEqual(self.cache.get("key1"), "spam")
self.assertEqual(self.cache.get("key2"), "eggs")
def test_set_many_expiration(self):
# set_many takes a second ``timeout`` parameter
self.cache.set_many({"key1": "spam", "key2": "eggs"}, 1)
time.sleep(2)
self.assertEqual(self.cache.get("key1"), None)
self.assertEqual(self.cache.get("key2"), None)
def test_delete_many(self):
# Multiple keys can be deleted using delete_many
self.cache.set("key1", "spam")
self.cache.set("key2", "eggs")
self.cache.set("key3", "ham")
self.cache.delete_many(["key1", "key2"])
self.assertEqual(self.cache.get("key1"), None)
self.assertEqual(self.cache.get("key2"), None)
self.assertEqual(self.cache.get("key3"), "ham")
def test_clear(self):
# The cache can be emptied using clear
self.cache.set("key1", "spam")
self.cache.set("key2", "eggs")
self.cache.clear()
self.assertEqual(self.cache.get("key1"), None)
self.assertEqual(self.cache.get("key2"), None)
def test_long_timeout(self):
'''
Using a timeout greater than 30 days makes memcached think
it is an absolute expiration timestamp instead of a relative
offset. Test that we honour this convention. Refs #12399.
'''
self.cache.set('key1', 'eggs', 60*60*24*30 + 1) #30 days + 1 second
self.assertEqual(self.cache.get('key1'), 'eggs')
self.cache.add('key2', 'ham', 60*60*24*30 + 1)
self.assertEqual(self.cache.get('key2'), 'ham')
self.cache.set_many({'key3': 'sausage', 'key4': 'lobster bisque'}, 60*60*24*30 + 1)
self.assertEqual(self.cache.get('key3'), 'sausage')
self.assertEqual(self.cache.get('key4'), 'lobster bisque')
def perform_cull_test(self, initial_count, final_count):
"""This is implemented as a utility method, because only some of the backends
implement culling. The culling algorithm also varies slightly, so the final
number of entries will vary between backends"""
# Create initial cache key entries. This will overflow the cache, causing a cull
for i in range(1, initial_count):
self.cache.set('cull%d' % i, 'value', 1000)
count = 0
# Count how many keys are left in the cache.
for i in range(1, initial_count):
if self.cache.has_key('cull%d' % i):
count = count + 1
self.assertEqual(count, final_count)
def test_invalid_keys(self):
"""
All the builtin backends (except memcached, see below) should warn on
keys that would be refused by memcached. This encourages portable
caching code without making it too difficult to use production backends
with more liberal key rules. Refs #6447.
"""
# mimic custom ``make_key`` method being defined since the default will
# never show the below warnings
def func(key, *args):
return key
old_func = self.cache.key_func
self.cache.key_func = func
# On Python 2.6+ we could use the catch_warnings context
# manager to test this warning nicely. Since we can't do that
# yet, the cleanest option is to temporarily ask for
# CacheKeyWarning to be raised as an exception.
_warnings_state = get_warnings_state()
warnings.simplefilter("error", CacheKeyWarning)
try:
# memcached does not allow whitespace or control characters in keys
self.assertRaises(CacheKeyWarning, self.cache.set, 'key with spaces', 'value')
# memcached limits key length to 250
self.assertRaises(CacheKeyWarning, self.cache.set, 'a' * 251, 'value')
finally:
restore_warnings_state(_warnings_state)
self.cache.key_func = old_func
def test_cache_versioning_get_set(self):
# set, using default version = 1
self.cache.set('answer1', 42)
self.assertEqual(self.cache.get('answer1'), 42)
self.assertEqual(self.cache.get('answer1', version=1), 42)
self.assertEqual(self.cache.get('answer1', version=2), None)
self.assertEqual(self.v2_cache.get('answer1'), None)
self.assertEqual(self.v2_cache.get('answer1', version=1), 42)
self.assertEqual(self.v2_cache.get('answer1', version=2), None)
# set, default version = 1, but manually override version = 2
self.cache.set('answer2', 42, version=2)
self.assertEqual(self.cache.get('answer2'), None)
self.assertEqual(self.cache.get('answer2', version=1), None)
self.assertEqual(self.cache.get('answer2', version=2), 42)
self.assertEqual(self.v2_cache.get('answer2'), 42)
self.assertEqual(self.v2_cache.get('answer2', version=1), None)
self.assertEqual(self.v2_cache.get('answer2', version=2), 42)
# v2 set, using default version = 2
self.v2_cache.set('answer3', 42)
self.assertEqual(self.cache.get('answer3'), None)
self.assertEqual(self.cache.get('answer3', version=1), None)
self.assertEqual(self.cache.get('answer3', version=2), 42)
self.assertEqual(self.v2_cache.get('answer3'), 42)
self.assertEqual(self.v2_cache.get('answer3', version=1), None)
self.assertEqual(self.v2_cache.get('answer3', version=2), 42)
# v2 set, default version = 2, but manually override version = 1
self.v2_cache.set('answer4', 42, version=1)
self.assertEqual(self.cache.get('answer4'), 42)
self.assertEqual(self.cache.get('answer4', version=1), 42)
self.assertEqual(self.cache.get('answer4', version=2), None)
self.assertEqual(self.v2_cache.get('answer4'), None)
self.assertEqual(self.v2_cache.get('answer4', version=1), 42)
self.assertEqual(self.v2_cache.get('answer4', version=2), None)
def test_cache_versioning_add(self):
# add, default version = 1, but manually override version = 2
self.cache.add('answer1', 42, version=2)
self.assertEqual(self.cache.get('answer1', version=1), None)
self.assertEqual(self.cache.get('answer1', version=2), 42)
self.cache.add('answer1', 37, version=2)
self.assertEqual(self.cache.get('answer1', version=1), None)
self.assertEqual(self.cache.get('answer1', version=2), 42)
self.cache.add('answer1', 37, version=1)
self.assertEqual(self.cache.get('answer1', version=1), 37)
self.assertEqual(self.cache.get('answer1', version=2), 42)
# v2 add, using default version = 2
self.v2_cache.add('answer2', 42)
self.assertEqual(self.cache.get('answer2', version=1), None)
self.assertEqual(self.cache.get('answer2', version=2), 42)
self.v2_cache.add('answer2', 37)
self.assertEqual(self.cache.get('answer2', version=1), None)
self.assertEqual(self.cache.get('answer2', version=2), 42)
self.v2_cache.add('answer2', 37, version=1)
self.assertEqual(self.cache.get('answer2', version=1), 37)
self.assertEqual(self.cache.get('answer2', version=2), 42)
# v2 add, default version = 2, but manually override version = 1
self.v2_cache.add('answer3', 42, version=1)
self.assertEqual(self.cache.get('answer3', version=1), 42)
self.assertEqual(self.cache.get('answer3', version=2), None)
self.v2_cache.add('answer3', 37, version=1)
self.assertEqual(self.cache.get('answer3', version=1), 42)
self.assertEqual(self.cache.get('answer3', version=2), None)
self.v2_cache.add('answer3', 37)
self.assertEqual(self.cache.get('answer3', version=1), 42)
self.assertEqual(self.cache.get('answer3', version=2), 37)
def test_cache_versioning_has_key(self):
self.cache.set('answer1', 42)
# has_key
self.assertTrue(self.cache.has_key('answer1'))
self.assertTrue(self.cache.has_key('answer1', version=1))
self.assertFalse(self.cache.has_key('answer1', version=2))
self.assertFalse(self.v2_cache.has_key('answer1'))
self.assertTrue(self.v2_cache.has_key('answer1', version=1))
self.assertFalse(self.v2_cache.has_key('answer1', version=2))
def test_cache_versioning_delete(self):
self.cache.set('answer1', 37, version=1)
self.cache.set('answer1', 42, version=2)
self.cache.delete('answer1')
self.assertEqual(self.cache.get('answer1', version=1), None)
self.assertEqual(self.cache.get('answer1', version=2), 42)
self.cache.set('answer2', 37, version=1)
self.cache.set('answer2', 42, version=2)
self.cache.delete('answer2', version=2)
self.assertEqual(self.cache.get('answer2', version=1), 37)
self.assertEqual(self.cache.get('answer2', version=2), None)
self.cache.set('answer3', 37, version=1)
self.cache.set('answer3', 42, version=2)
self.v2_cache.delete('answer3')
self.assertEqual(self.cache.get('answer3', version=1), 37)
self.assertEqual(self.cache.get('answer3', version=2), None)
self.cache.set('answer4', 37, version=1)
self.cache.set('answer4', 42, version=2)
self.v2_cache.delete('answer4', version=1)
self.assertEqual(self.cache.get('answer4', version=1), None)
self.assertEqual(self.cache.get('answer4', version=2), 42)
def test_cache_versioning_incr_decr(self):
self.cache.set('answer1', 37, version=1)
self.cache.set('answer1', 42, version=2)
self.cache.incr('answer1')
self.assertEqual(self.cache.get('answer1', version=1), 38)
self.assertEqual(self.cache.get('answer1', version=2), 42)
self.cache.decr('answer1')
self.assertEqual(self.cache.get('answer1', version=1), 37)
self.assertEqual(self.cache.get('answer1', version=2), 42)
self.cache.set('answer2', 37, version=1)
self.cache.set('answer2', 42, version=2)
self.cache.incr('answer2', version=2)
self.assertEqual(self.cache.get('answer2', version=1), 37)
self.assertEqual(self.cache.get('answer2', version=2), 43)
self.cache.decr('answer2', version=2)
self.assertEqual(self.cache.get('answer2', version=1), 37)
self.assertEqual(self.cache.get('answer2', version=2), 42)
self.cache.set('answer3', 37, version=1)
self.cache.set('answer3', 42, version=2)
self.v2_cache.incr('answer3')
self.assertEqual(self.cache.get('answer3', version=1), 37)
self.assertEqual(self.cache.get('answer3', version=2), 43)
self.v2_cache.decr('answer3')
self.assertEqual(self.cache.get('answer3', version=1), 37)
self.assertEqual(self.cache.get('answer3', version=2), 42)
self.cache.set('answer4', 37, version=1)
self.cache.set('answer4', 42, version=2)
self.v2_cache.incr('answer4', version=1)
self.assertEqual(self.cache.get('answer4', version=1), 38)
self.assertEqual(self.cache.get('answer4', version=2), 42)
self.v2_cache.decr('answer4', version=1)
self.assertEqual(self.cache.get('answer4', version=1), 37)
self.assertEqual(self.cache.get('answer4', version=2), 42)
def test_cache_versioning_get_set_many(self):
# set, using default version = 1
self.cache.set_many({'ford1': 37, 'arthur1': 42})
self.assertEqual(self.cache.get_many(['ford1','arthur1']),
{'ford1': 37, 'arthur1': 42})
self.assertEqual(self.cache.get_many(['ford1','arthur1'], version=1),
{'ford1': 37, 'arthur1': 42})
self.assertEqual(self.cache.get_many(['ford1','arthur1'], version=2), {})
self.assertEqual(self.v2_cache.get_many(['ford1','arthur1']), {})
self.assertEqual(self.v2_cache.get_many(['ford1','arthur1'], version=1),
{'ford1': 37, 'arthur1': 42})
self.assertEqual(self.v2_cache.get_many(['ford1','arthur1'], version=2), {})
# set, default version = 1, but manually override version = 2
self.cache.set_many({'ford2': 37, 'arthur2': 42}, version=2)
self.assertEqual(self.cache.get_many(['ford2','arthur2']), {})
self.assertEqual(self.cache.get_many(['ford2','arthur2'], version=1), {})
self.assertEqual(self.cache.get_many(['ford2','arthur2'], version=2),
{'ford2': 37, 'arthur2': 42})
self.assertEqual(self.v2_cache.get_many(['ford2','arthur2']),
{'ford2': 37, 'arthur2': 42})
self.assertEqual(self.v2_cache.get_many(['ford2','arthur2'], version=1), {})
self.assertEqual(self.v2_cache.get_many(['ford2','arthur2'], version=2),
{'ford2': 37, 'arthur2': 42})
# v2 set, using default version = 2
self.v2_cache.set_many({'ford3': 37, 'arthur3': 42})
self.assertEqual(self.cache.get_many(['ford3','arthur3']), {})
self.assertEqual(self.cache.get_many(['ford3','arthur3'], version=1), {})
self.assertEqual(self.cache.get_many(['ford3','arthur3'], version=2),
{'ford3': 37, 'arthur3': 42})
self.assertEqual(self.v2_cache.get_many(['ford3','arthur3']),
{'ford3': 37, 'arthur3': 42})
self.assertEqual(self.v2_cache.get_many(['ford3','arthur3'], version=1), {})
self.assertEqual(self.v2_cache.get_many(['ford3','arthur3'], version=2),
{'ford3': 37, 'arthur3': 42})
# v2 set, default version = 2, but manually override version = 1
self.v2_cache.set_many({'ford4': 37, 'arthur4': 42}, version=1)
self.assertEqual(self.cache.get_many(['ford4','arthur4']),
{'ford4': 37, 'arthur4': 42})
self.assertEqual(self.cache.get_many(['ford4','arthur4'], version=1),
{'ford4': 37, 'arthur4': 42})
self.assertEqual(self.cache.get_many(['ford4','arthur4'], version=2), {})
self.assertEqual(self.v2_cache.get_many(['ford4','arthur4']), {})
self.assertEqual(self.v2_cache.get_many(['ford4','arthur4'], version=1),
{'ford4': 37, 'arthur4': 42})
self.assertEqual(self.v2_cache.get_many(['ford4','arthur4'], version=2), {})
def test_incr_version(self):
self.cache.set('answer', 42, version=2)
self.assertEqual(self.cache.get('answer'), None)
self.assertEqual(self.cache.get('answer', version=1), None)
self.assertEqual(self.cache.get('answer', version=2), 42)
self.assertEqual(self.cache.get('answer', version=3), None)
self.assertEqual(self.cache.incr_version('answer', version=2), 3)
self.assertEqual(self.cache.get('answer'), None)
self.assertEqual(self.cache.get('answer', version=1), None)
self.assertEqual(self.cache.get('answer', version=2), None)
self.assertEqual(self.cache.get('answer', version=3), 42)
self.v2_cache.set('answer2', 42)
self.assertEqual(self.v2_cache.get('answer2'), 42)
self.assertEqual(self.v2_cache.get('answer2', version=1), None)
self.assertEqual(self.v2_cache.get('answer2', version=2), 42)
self.assertEqual(self.v2_cache.get('answer2', version=3), None)
self.assertEqual(self.v2_cache.incr_version('answer2'), 3)
self.assertEqual(self.v2_cache.get('answer2'), None)
self.assertEqual(self.v2_cache.get('answer2', version=1), None)
self.assertEqual(self.v2_cache.get('answer2', version=2), None)
self.assertEqual(self.v2_cache.get('answer2', version=3), 42)
self.assertRaises(ValueError, self.cache.incr_version, 'does_not_exist')
def test_decr_version(self):
self.cache.set('answer', 42, version=2)
self.assertEqual(self.cache.get('answer'), None)
self.assertEqual(self.cache.get('answer', version=1), None)
self.assertEqual(self.cache.get('answer', version=2), 42)
self.assertEqual(self.cache.decr_version('answer', version=2), 1)
self.assertEqual(self.cache.get('answer'), 42)
self.assertEqual(self.cache.get('answer', version=1), 42)
self.assertEqual(self.cache.get('answer', version=2), None)
self.v2_cache.set('answer2', 42)
self.assertEqual(self.v2_cache.get('answer2'), 42)
self.assertEqual(self.v2_cache.get('answer2', version=1), None)
self.assertEqual(self.v2_cache.get('answer2', version=2), 42)
self.assertEqual(self.v2_cache.decr_version('answer2'), 1)
self.assertEqual(self.v2_cache.get('answer2'), None)
self.assertEqual(self.v2_cache.get('answer2', version=1), 42)
self.assertEqual(self.v2_cache.get('answer2', version=2), None)
self.assertRaises(ValueError, self.cache.decr_version, 'does_not_exist', version=2)
def test_custom_key_func(self):
# Two caches with different key functions aren't visible to each other
self.cache.set('answer1', 42)
self.assertEqual(self.cache.get('answer1'), 42)
self.assertEqual(self.custom_key_cache.get('answer1'), None)
self.assertEqual(self.custom_key_cache2.get('answer1'), None)
self.custom_key_cache.set('answer2', 42)
self.assertEqual(self.cache.get('answer2'), None)
self.assertEqual(self.custom_key_cache.get('answer2'), 42)
self.assertEqual(self.custom_key_cache2.get('answer2'), 42)
def custom_key_func(key, key_prefix, version):
"A customized cache key function"
return 'CUSTOM-' + '-'.join([key_prefix, str(version), key])
class DBCacheTests(unittest.TestCase, BaseCacheTests):
def setUp(self):
# Spaces are used in the table name to ensure quoting/escaping is working
self._table_name = 'test cache table'
management.call_command('createcachetable', self._table_name, verbosity=0, interactive=False)
self.cache = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, OPTIONS={'MAX_ENTRIES': 30})
self.prefix_cache = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, KEY_PREFIX='cacheprefix')
self.v2_cache = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, VERSION=2)
self.custom_key_cache = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, KEY_FUNCTION=custom_key_func)
self.custom_key_cache2 = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, KEY_FUNCTION='regressiontests.cache.tests.custom_key_func')
def tearDown(self):
from django.db import connection
cursor = connection.cursor()
cursor.execute('DROP TABLE %s' % connection.ops.quote_name(self._table_name))
def test_cull(self):
self.perform_cull_test(50, 29)
def test_zero_cull(self):
self.cache = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, OPTIONS={'MAX_ENTRIES': 30, 'CULL_FREQUENCY': 0})
self.perform_cull_test(50, 18)
def test_old_initialization(self):
self.cache = get_cache('db://%s?max_entries=30&cull_frequency=0' % self._table_name)
self.perform_cull_test(50, 18)
class LocMemCacheTests(unittest.TestCase, BaseCacheTests):
def setUp(self):
self.cache = get_cache('django.core.cache.backends.locmem.LocMemCache', OPTIONS={'MAX_ENTRIES': 30})
self.prefix_cache = get_cache('django.core.cache.backends.locmem.LocMemCache', KEY_PREFIX='cacheprefix')
self.v2_cache = get_cache('django.core.cache.backends.locmem.LocMemCache', VERSION=2)
self.custom_key_cache = get_cache('django.core.cache.backends.locmem.LocMemCache', OPTIONS={'MAX_ENTRIES': 30}, KEY_FUNCTION=custom_key_func)
self.custom_key_cache2 = get_cache('django.core.cache.backends.locmem.LocMemCache', OPTIONS={'MAX_ENTRIES': 30}, KEY_FUNCTION='regressiontests.cache.tests.custom_key_func')
# LocMem requires a hack to make the other caches
# share a data store with the 'normal' cache.
self.prefix_cache._cache = self.cache._cache
self.prefix_cache._expire_info = self.cache._expire_info
self.v2_cache._cache = self.cache._cache
self.v2_cache._expire_info = self.cache._expire_info
self.custom_key_cache._cache = self.cache._cache
self.custom_key_cache._expire_info = self.cache._expire_info
self.custom_key_cache2._cache = self.cache._cache
self.custom_key_cache2._expire_info = self.cache._expire_info
def tearDown(self):
self.cache.clear()
def test_cull(self):
self.perform_cull_test(50, 29)
def test_zero_cull(self):
self.cache = get_cache('django.core.cache.backends.locmem.LocMemCache', OPTIONS={'MAX_ENTRIES': 30, 'CULL_FREQUENCY': 0})
self.perform_cull_test(50, 19)
def test_old_initialization(self):
self.cache = get_cache('locmem://?max_entries=30&cull_frequency=0')
self.perform_cull_test(50, 19)
def test_multiple_caches(self):
"Check that multiple locmem caches are isolated"
mirror_cache = get_cache('django.core.cache.backends.locmem.LocMemCache')
other_cache = get_cache('django.core.cache.backends.locmem.LocMemCache', LOCATION='other')
self.cache.set('value1', 42)
self.assertEquals(mirror_cache.get('value1'), 42)
self.assertEquals(other_cache.get('value1'), None)
# memcached backend isn't guaranteed to be available.
# To check the memcached backend, the test settings file will
# need to contain a cache backend setting that points at
# your memcache server.
class MemcachedCacheTests(unittest.TestCase, BaseCacheTests):
def setUp(self):
name = settings.CACHES[DEFAULT_CACHE_ALIAS]['LOCATION']
self.cache = get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION=name)
self.prefix_cache = get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION=name, KEY_PREFIX='cacheprefix')
self.v2_cache = get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION=name, VERSION=2)
self.custom_key_cache = get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION=name, KEY_FUNCTION=custom_key_func)
self.custom_key_cache2 = get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION=name, KEY_FUNCTION='regressiontests.cache.tests.custom_key_func')
def tearDown(self):
self.cache.clear()
def test_invalid_keys(self):
"""
On memcached, we don't introduce a duplicate key validation
step (for speed reasons), we just let the memcached API
library raise its own exception on bad keys. Refs #6447.
In order to be memcached-API-library agnostic, we only assert
that a generic exception of some kind is raised.
"""
# memcached does not allow whitespace or control characters in keys
self.assertRaises(Exception, self.cache.set, 'key with spaces', 'value')
# memcached limits key length to 250
self.assertRaises(Exception, self.cache.set, 'a' * 251, 'value')
MemcachedCacheTests = unittest.skipUnless(settings.CACHES[DEFAULT_CACHE_ALIAS]['BACKEND'].startswith('django.core.cache.backends.memcached.'), "memcached not available")(MemcachedCacheTests)
class FileBasedCacheTests(unittest.TestCase, BaseCacheTests):
"""
Specific test cases for the file-based cache.
"""
def setUp(self):
self.dirname = tempfile.mkdtemp()
self.cache = get_cache('django.core.cache.backends.filebased.FileBasedCache', LOCATION=self.dirname, OPTIONS={'MAX_ENTRIES': 30})
self.prefix_cache = get_cache('django.core.cache.backends.filebased.FileBasedCache', LOCATION=self.dirname, KEY_PREFIX='cacheprefix')
self.v2_cache = get_cache('django.core.cache.backends.filebased.FileBasedCache', LOCATION=self.dirname, VERSION=2)
self.custom_key_cache = get_cache('django.core.cache.backends.filebased.FileBasedCache', LOCATION=self.dirname, KEY_FUNCTION=custom_key_func)
self.custom_key_cache2 = get_cache('django.core.cache.backends.filebased.FileBasedCache', LOCATION=self.dirname, KEY_FUNCTION='regressiontests.cache.tests.custom_key_func')
def tearDown(self):
self.cache.clear()
def test_hashing(self):
"""Test that keys are hashed into subdirectories correctly"""
self.cache.set("foo", "bar")
key = self.cache.make_key("foo")
keyhash = md5_constructor(key).hexdigest()
keypath = os.path.join(self.dirname, keyhash[:2], keyhash[2:4], keyhash[4:])
self.assert_(os.path.exists(keypath))
def test_subdirectory_removal(self):
"""
Make sure that the created subdirectories are correctly removed when empty.
"""
self.cache.set("foo", "bar")
key = self.cache.make_key("foo")
keyhash = md5_constructor(key).hexdigest()
keypath = os.path.join(self.dirname, keyhash[:2], keyhash[2:4], keyhash[4:])
self.assert_(os.path.exists(keypath))
self.cache.delete("foo")
self.assert_(not os.path.exists(keypath))
self.assert_(not os.path.exists(os.path.dirname(keypath)))
self.assert_(not os.path.exists(os.path.dirname(os.path.dirname(keypath))))
def test_cull(self):
self.perform_cull_test(50, 29)
def test_old_initialization(self):
self.cache = get_cache('file://%s?max_entries=30' % self.dirname)
self.perform_cull_test(50, 29)
class CustomCacheKeyValidationTests(unittest.TestCase):
"""
Tests for the ability to mixin a custom ``validate_key`` method to
a custom cache backend that otherwise inherits from a builtin
backend, and override the default key validation. Refs #6447.
"""
def test_custom_key_validation(self):
cache = get_cache('regressiontests.cache.liberal_backend://')
# this key is both longer than 250 characters, and has spaces
key = 'some key with spaces' * 15
val = 'a value'
cache.set(key, val)
self.assertEqual(cache.get(key), val)
class CacheUtils(unittest.TestCase):
"""TestCase for django.utils.cache functions."""
def setUp(self):
self.path = '/cache/test/'
self.old_cache_middleware_key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.old_cache_middleware_seconds = settings.CACHE_MIDDLEWARE_SECONDS
self.orig_use_i18n = settings.USE_I18N
settings.CACHE_MIDDLEWARE_KEY_PREFIX = 'settingsprefix'
settings.CACHE_MIDDLEWARE_SECONDS = 1
settings.USE_I18N = False
def tearDown(self):
settings.CACHE_MIDDLEWARE_KEY_PREFIX = self.old_cache_middleware_key_prefix
settings.CACHE_MIDDLEWARE_SECONDS = self.old_cache_middleware_seconds
settings.USE_I18N = self.orig_use_i18n
def _get_request(self, path, method='GET'):
request = HttpRequest()
request.META = {
'SERVER_NAME': 'testserver',
'SERVER_PORT': 80,
}
request.method = method
request.path = request.path_info = "/cache/%s" % path
return request
def test_patch_vary_headers(self):
headers = (
# Initial vary, new headers, resulting vary.
(None, ('Accept-Encoding',), 'Accept-Encoding'),
('Accept-Encoding', ('accept-encoding',), 'Accept-Encoding'),
('Accept-Encoding', ('ACCEPT-ENCODING',), 'Accept-Encoding'),
('Cookie', ('Accept-Encoding',), 'Cookie, Accept-Encoding'),
('Cookie, Accept-Encoding', ('Accept-Encoding',), 'Cookie, Accept-Encoding'),
('Cookie, Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
(None, ('Accept-Encoding', 'COOKIE'), 'Accept-Encoding, COOKIE'),
('Cookie, Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
('Cookie , Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
)
for initial_vary, newheaders, resulting_vary in headers:
response = HttpResponse()
if initial_vary is not None:
response['Vary'] = initial_vary
patch_vary_headers(response, newheaders)
self.assertEqual(response['Vary'], resulting_vary)
def test_get_cache_key(self):
request = self._get_request(self.path)
response = HttpResponse()
key_prefix = 'localprefix'
# Expect None if no headers have been set yet.
self.assertEqual(get_cache_key(request), None)
# Set headers to an empty list.
learn_cache_key(request, response)
self.assertEqual(get_cache_key(request), 'views.decorators.cache.cache_page.settingsprefix.GET.a8c87a3d8c44853d7f79474f7ffe4ad5.d41d8cd98f00b204e9800998ecf8427e')
# Verify that a specified key_prefix is taken in to account.
learn_cache_key(request, response, key_prefix=key_prefix)
self.assertEqual(get_cache_key(request, key_prefix=key_prefix), 'views.decorators.cache.cache_page.localprefix.GET.a8c87a3d8c44853d7f79474f7ffe4ad5.d41d8cd98f00b204e9800998ecf8427e')
def test_learn_cache_key(self):
request = self._get_request(self.path, 'HEAD')
response = HttpResponse()
response['Vary'] = 'Pony'
# Make sure that the Vary header is added to the key hash
learn_cache_key(request, response)
self.assertEqual(get_cache_key(request), 'views.decorators.cache.cache_page.settingsprefix.HEAD.a8c87a3d8c44853d7f79474f7ffe4ad5.d41d8cd98f00b204e9800998ecf8427e')
class PrefixedCacheUtils(CacheUtils):
def setUp(self):
super(PrefixedCacheUtils, self).setUp()
self.old_cache_key_prefix = settings.CACHES['default'].get('KEY_PREFIX', None)
settings.CACHES['default']['KEY_PREFIX'] = 'cacheprefix'
def tearDown(self):
super(PrefixedCacheUtils, self).tearDown()
if self.old_cache_key_prefix is None:
del settings.CACHES['default']['KEY_PREFIX']
else:
settings.CACHES['default']['KEY_PREFIX'] = self.old_cache_key_prefix
class CacheHEADTest(unittest.TestCase):
def setUp(self):
self.orig_cache_middleware_seconds = settings.CACHE_MIDDLEWARE_SECONDS
self.orig_cache_middleware_key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.orig_caches = settings.CACHES
settings.CACHE_MIDDLEWARE_SECONDS = 60
settings.CACHE_MIDDLEWARE_KEY_PREFIX = 'test'
settings.CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'
}
}
self.path = '/cache/test/'
def tearDown(self):
settings.CACHE_MIDDLEWARE_SECONDS = self.orig_cache_middleware_seconds
settings.CACHE_MIDDLEWARE_KEY_PREFIX = self.orig_cache_middleware_key_prefix
settings.CACHES = self.orig_caches
def _get_request(self, method):
request = HttpRequest()
request.META = {
'SERVER_NAME': 'testserver',
'SERVER_PORT': 80,
}
request.method = method
request.path = request.path_info = self.path
return request
def _get_request_cache(self, method):
request = self._get_request(method)
request._cache_update_cache = True
return request
def _set_cache(self, request, msg):
response = HttpResponse()
response.content = msg
return UpdateCacheMiddleware().process_response(request, response)
def test_head_caches_correctly(self):
test_content = 'test content'
request = self._get_request_cache('HEAD')
self._set_cache(request, test_content)
request = self._get_request('HEAD')
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertNotEqual(get_cache_data, None)
self.assertEqual(test_content, get_cache_data.content)
def test_head_with_cached_get(self):
test_content = 'test content'
request = self._get_request_cache('GET')
self._set_cache(request, test_content)
request = self._get_request('HEAD')
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertNotEqual(get_cache_data, None)
self.assertEqual(test_content, get_cache_data.content)
class CacheI18nTest(unittest.TestCase):
def setUp(self):
self.orig_cache_middleware_seconds = settings.CACHE_MIDDLEWARE_SECONDS
self.orig_cache_middleware_key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.orig_caches = settings.CACHES
self.orig_use_i18n = settings.USE_I18N
self.orig_languages = settings.LANGUAGES
settings.LANGUAGES = (
('en', 'English'),
('es', 'Spanish'),
)
settings.CACHE_MIDDLEWARE_KEY_PREFIX = 'settingsprefix'
self.path = '/cache/test/'
def tearDown(self):
settings.CACHE_MIDDLEWARE_SECONDS = self.orig_cache_middleware_seconds
settings.CACHE_MIDDLEWARE_KEY_PREFIX = self.orig_cache_middleware_key_prefix
settings.CACHES = self.orig_caches
settings.USE_I18N = self.orig_use_i18n
settings.LANGUAGES = self.orig_languages
translation.deactivate()
def _get_request(self):
request = HttpRequest()
request.META = {
'SERVER_NAME': 'testserver',
'SERVER_PORT': 80,
}
request.path = request.path_info = self.path
return request
def _get_request_cache(self):
request = HttpRequest()
request.META = {
'SERVER_NAME': 'testserver',
'SERVER_PORT': 80,
}
request.path = request.path_info = self.path
request._cache_update_cache = True
request.method = 'GET'
request.session = {}
return request
def test_cache_key_i18n(self):
settings.USE_I18N = True
request = self._get_request()
lang = translation.get_language()
response = HttpResponse()
key = learn_cache_key(request, response)
self.assertTrue(key.endswith(lang), "Cache keys should include the language name when i18n is active")
key2 = get_cache_key(request)
self.assertEqual(key, key2)
def test_cache_key_no_i18n (self):
settings.USE_I18N = False
request = self._get_request()
lang = translation.get_language()
response = HttpResponse()
key = learn_cache_key(request, response)
self.assertFalse(key.endswith(lang), "Cache keys shouldn't include the language name when i18n is inactive")
def test_middleware(self):
def set_cache(request, lang, msg):
translation.activate(lang)
response = HttpResponse()
response.content= msg
return UpdateCacheMiddleware().process_response(request, response)
settings.CACHE_MIDDLEWARE_SECONDS = 60
settings.CACHE_MIDDLEWARE_KEY_PREFIX = "test"
settings.CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'
}
}
settings.USE_ETAGS = True
settings.USE_I18N = True
en_message ="Hello world!"
es_message ="Hola mundo!"
request = self._get_request_cache()
set_cache(request, 'en', en_message)
get_cache_data = FetchFromCacheMiddleware().process_request(request)
# Check that we can recover the cache
self.assertNotEqual(get_cache_data.content, None)
self.assertEqual(en_message, get_cache_data.content)
# Check that we use etags
self.assertTrue(get_cache_data.has_header('ETag'))
# Check that we can disable etags
settings.USE_ETAGS = False
request._cache_update_cache = True
set_cache(request, 'en', en_message)
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertFalse(get_cache_data.has_header('ETag'))
# change the session language and set content
request = self._get_request_cache()
set_cache(request, 'es', es_message)
# change again the language
translation.activate('en')
# retrieve the content from cache
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertEqual(get_cache_data.content, en_message)
# change again the language
translation.activate('es')
get_cache_data = FetchFromCacheMiddleware().process_request(request)
self.assertEqual(get_cache_data.content, es_message)
class PrefixedCacheI18nTest(CacheI18nTest):
def setUp(self):
super(PrefixedCacheI18nTest, self).setUp()
self.old_cache_key_prefix = settings.CACHES['default'].get('KEY_PREFIX', None)
settings.CACHES['default']['KEY_PREFIX'] = 'cacheprefix'
def tearDown(self):
super(PrefixedCacheI18nTest, self).tearDown()
if self.old_cache_key_prefix is not None:
del settings.CACHES['default']['KEY_PREFIX']
else:
settings.CACHES['default']['KEY_PREFIX'] = self.old_cache_key_prefix
class CacheMiddlewareTest(unittest.TestCase):
def setUp(self):
self.orig_cache_middleware_alias = settings.CACHE_MIDDLEWARE_ALIAS
self.orig_cache_middleware_key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.orig_cache_middleware_seconds = settings.CACHE_MIDDLEWARE_SECONDS
self.orig_cache_middleware_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
self.orig_caches = settings.CACHES
settings.CACHE_MIDDLEWARE_ALIAS = 'other'
settings.CACHE_MIDDLEWARE_KEY_PREFIX = 'middlewareprefix'
settings.CACHE_MIDDLEWARE_SECONDS = 30
settings.CACHE_MIDDLEWARE_ANONYMOUS_ONLY = False
settings.CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'
},
'other': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'LOCATION': 'other',
'TIMEOUT': '1'
}
}
def tearDown(self):
settings.CACHE_MIDDLEWARE_ALIAS = self.orig_cache_middleware_alias
settings.CACHE_MIDDLEWARE_KEY_PREFIX = self.orig_cache_middleware_key_prefix
settings.CACHE_MIDDLEWARE_SECONDS = self.orig_cache_middleware_seconds
settings.CACHE_MIDDLEWARE_ANONYMOUS_ONLY = self.orig_cache_middleware_anonymous_only
settings.CACHES = self.orig_caches
def test_constructor(self):
"""
Ensure the constructor is correctly distinguishing between usage of CacheMiddleware as
Middleware vs. usage of CacheMiddleware as view decorator and setting attributes
appropriately.
"""
# If no arguments are passed in construction, it's being used as middleware.
middleware = CacheMiddleware()
# Now test object attributes against values defined in setUp above
self.assertEquals(middleware.cache_timeout, 30)
self.assertEquals(middleware.key_prefix, 'middlewareprefix')
self.assertEquals(middleware.cache_alias, 'other')
self.assertEquals(middleware.cache_anonymous_only, False)
# If arguments are being passed in construction, it's being used as a decorator.
# First, test with "defaults":
as_view_decorator = CacheMiddleware(cache_alias=None, key_prefix=None)
self.assertEquals(as_view_decorator.cache_timeout, 300) # Timeout value for 'default' cache, i.e. 300
self.assertEquals(as_view_decorator.key_prefix, '')
self.assertEquals(as_view_decorator.cache_alias, 'default') # Value of DEFAULT_CACHE_ALIAS from django.core.cache
self.assertEquals(as_view_decorator.cache_anonymous_only, False)
# Next, test with custom values:
as_view_decorator_with_custom = CacheMiddleware(cache_anonymous_only=True, cache_timeout=60, cache_alias='other', key_prefix='foo')
self.assertEquals(as_view_decorator_with_custom.cache_timeout, 60)
self.assertEquals(as_view_decorator_with_custom.key_prefix, 'foo')
self.assertEquals(as_view_decorator_with_custom.cache_alias, 'other')
self.assertEquals(as_view_decorator_with_custom.cache_anonymous_only, True)
def test_middleware(self):
def view(request, value):
return HttpResponse('Hello World %s' % value)
factory = RequestFactory()
middleware = CacheMiddleware()
prefix_middleware = CacheMiddleware(key_prefix='prefix1')
timeout_middleware = CacheMiddleware(cache_timeout=1)
request = factory.get('/view/')
# Put the request through the request middleware
result = middleware.process_request(request)
self.assertEquals(result, None)
response = view(request, '1')
# Now put the response through the response middleware
response = middleware.process_response(request, response)
# Repeating the request should result in a cache hit
result = middleware.process_request(request)
self.assertNotEquals(result, None)
self.assertEquals(result.content, 'Hello World 1')
# The same request through a different middleware won't hit
result = prefix_middleware.process_request(request)
self.assertEquals(result, None)
# The same request with a timeout _will_ hit
result = timeout_middleware.process_request(request)
self.assertNotEquals(result, None)
self.assertEquals(result.content, 'Hello World 1')
def test_view_decorator(self):
def view(request, value):
return HttpResponse('Hello World %s' % value)
# decorate the same view with different cache decorators
default_view = cache_page(view)
default_with_prefix_view = cache_page(key_prefix='prefix1')(view)
explicit_default_view = cache_page(cache='default')(view)
explicit_default_with_prefix_view = cache_page(cache='default', key_prefix='prefix1')(view)
other_view = cache_page(cache='other')(view)
other_with_prefix_view = cache_page(cache='other', key_prefix='prefix2')(view)
other_with_timeout_view = cache_page(4, cache='other', key_prefix='prefix3')(view)
factory = RequestFactory()
request = factory.get('/view/')
# Request the view once
response = default_view(request, '1')
self.assertEquals(response.content, 'Hello World 1')
# Request again -- hit the cache
response = default_view(request, '2')
self.assertEquals(response.content, 'Hello World 1')
# Requesting the same view with the explicit cache should yield the same result
response = explicit_default_view(request, '3')
self.assertEquals(response.content, 'Hello World 1')
# Requesting with a prefix will hit a different cache key
response = explicit_default_with_prefix_view(request, '4')
self.assertEquals(response.content, 'Hello World 4')
# Hitting the same view again gives a cache hit
response = explicit_default_with_prefix_view(request, '5')
self.assertEquals(response.content, 'Hello World 4')
# And going back to the implicit cache will hit the same cache
response = default_with_prefix_view(request, '6')
self.assertEquals(response.content, 'Hello World 4')
# Requesting from an alternate cache won't hit cache
response = other_view(request, '7')
self.assertEquals(response.content, 'Hello World 7')
# But a repeated hit will hit cache
response = other_view(request, '8')
self.assertEquals(response.content, 'Hello World 7')
# And prefixing the alternate cache yields yet another cache entry
response = other_with_prefix_view(request, '9')
self.assertEquals(response.content, 'Hello World 9')
# Request from the alternate cache with a new prefix and a custom timeout
response = other_with_timeout_view(request, '10')
self.assertEquals(response.content, 'Hello World 10')
# But if we wait a couple of seconds...
time.sleep(2)
# ... the default cache will still hit
cache = get_cache('default')
response = default_view(request, '11')
self.assertEquals(response.content, 'Hello World 1')
# ... the default cache with a prefix will still hit
response = default_with_prefix_view(request, '12')
self.assertEquals(response.content, 'Hello World 4')
# ... the explicit default cache will still hit
response = explicit_default_view(request, '13')
self.assertEquals(response.content, 'Hello World 1')
# ... the explicit default cache with a prefix will still hit
response = explicit_default_with_prefix_view(request, '14')
self.assertEquals(response.content, 'Hello World 4')
# .. but a rapidly expiring cache won't hit
response = other_view(request, '15')
self.assertEquals(response.content, 'Hello World 15')
# .. even if it has a prefix
response = other_with_prefix_view(request, '16')
self.assertEquals(response.content, 'Hello World 16')
# ... but a view with a custom timeout will still hit
response = other_with_timeout_view(request, '17')
self.assertEquals(response.content, 'Hello World 10')
# And if we wait a few more seconds
time.sleep(2)
# the custom timeouot cache will miss
response = other_with_timeout_view(request, '18')
self.assertEquals(response.content, 'Hello World 18')
class CacheMiddlewareAnonymousOnlyTests(TestCase):
urls = 'regressiontests.cache.urls'
def setUp(self):
self._orig_cache_middleware_anonymous_only = \
getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
self._orig_middleware_classes = settings.MIDDLEWARE_CLASSES
settings.MIDDLEWARE_CLASSES = list(settings.MIDDLEWARE_CLASSES)
settings.MIDDLEWARE_CLASSES.insert(0, 'django.middleware.cache.UpdateCacheMiddleware')
settings.MIDDLEWARE_CLASSES += ['django.middleware.cache.FetchFromCacheMiddleware']
def tearDown(self):
settings.CACHE_MIDDLEWARE_ANONYMOUS_ONLY = self._orig_cache_middleware_anonymous_only
settings.MIDDLEWARE_CLASSES = self._orig_middleware_classes
def test_cache_middleware_anonymous_only_does_not_cause_vary_cookie(self):
settings.CACHE_MIDDLEWARE_ANONYMOUS_ONLY = True
response = self.client.get('/')
self.failIf('Cookie' in response.get('Vary', ''))
if __name__ == '__main__':
unittest.main()
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