360 lines
14 KiB
Python
360 lines
14 KiB
Python
# -*- coding: utf-8 -*-
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# Unit tests for cache framework
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# Uses whatever cache backend is set in the test settings file.
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import os
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import shutil
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import tempfile
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import time
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import unittest
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from django.conf import settings
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from django.core import management
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from django.core.cache import get_cache
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from django.core.cache.backends.base import InvalidCacheBackendError
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from django.http import HttpResponse, HttpRequest
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from django.utils.cache import patch_vary_headers, get_cache_key, learn_cache_key
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from django.utils.hashcompat import md5_constructor
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# functions/classes for complex data type tests
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def f():
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return 42
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class C:
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def m(n):
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return 24
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class DummyCacheTests(unittest.TestCase):
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# The Dummy cache backend doesn't really behave like a test backend,
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# so it has different test requirements.
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def setUp(self):
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self.cache = get_cache('dummy://')
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def test_simple(self):
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"Dummy cache backend ignores cache set calls"
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self.cache.set("key", "value")
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self.assertEqual(self.cache.get("key"), None)
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def test_add(self):
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"Add doesn't do anything in dummy cache backend"
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self.cache.add("addkey1", "value")
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result = self.cache.add("addkey1", "newvalue")
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self.assertEqual(result, True)
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self.assertEqual(self.cache.get("addkey1"), None)
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def test_non_existent(self):
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"Non-existent keys aren't found in the dummy cache backend"
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self.assertEqual(self.cache.get("does_not_exist"), None)
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self.assertEqual(self.cache.get("does_not_exist", "bang!"), "bang!")
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def test_get_many(self):
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"get_many returns nothing for the dummy cache backend"
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self.cache.set('a', 'a')
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self.cache.set('b', 'b')
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self.cache.set('c', 'c')
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self.cache.set('d', 'd')
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self.assertEqual(self.cache.get_many(['a', 'c', 'd']), {})
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self.assertEqual(self.cache.get_many(['a', 'b', 'e']), {})
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def test_delete(self):
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"Cache deletion is transparently ignored on the dummy cache backend"
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self.cache.set("key1", "spam")
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self.cache.set("key2", "eggs")
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self.assertEqual(self.cache.get("key1"), None)
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self.cache.delete("key1")
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self.assertEqual(self.cache.get("key1"), None)
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self.assertEqual(self.cache.get("key2"), None)
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def test_has_key(self):
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"The has_key method doesn't ever return True for the dummy cache backend"
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self.cache.set("hello1", "goodbye1")
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self.assertEqual(self.cache.has_key("hello1"), False)
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self.assertEqual(self.cache.has_key("goodbye1"), False)
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def test_in(self):
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"The in operator doesn't ever return True for the dummy cache backend"
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self.cache.set("hello2", "goodbye2")
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self.assertEqual("hello2" in self.cache, False)
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self.assertEqual("goodbye2" in self.cache, False)
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def test_incr(self):
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"Dummy cache values can't be incremented"
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self.cache.set('answer', 42)
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self.assertRaises(ValueError, self.cache.incr, 'answer')
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self.assertRaises(ValueError, self.cache.incr, 'does_not_exist')
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def test_decr(self):
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"Dummy cache values can't be decremented"
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self.cache.set('answer', 42)
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self.assertRaises(ValueError, self.cache.decr, 'answer')
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self.assertRaises(ValueError, self.cache.decr, 'does_not_exist')
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def test_data_types(self):
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"All data types are ignored equally by the dummy cache"
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stuff = {
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'string' : 'this is a string',
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'int' : 42,
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'list' : [1, 2, 3, 4],
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'tuple' : (1, 2, 3, 4),
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'dict' : {'A': 1, 'B' : 2},
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'function' : f,
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'class' : C,
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}
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self.cache.set("stuff", stuff)
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self.assertEqual(self.cache.get("stuff"), None)
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def test_expiration(self):
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"Expiration has no effect on the dummy cache"
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self.cache.set('expire1', 'very quickly', 1)
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self.cache.set('expire2', 'very quickly', 1)
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self.cache.set('expire3', 'very quickly', 1)
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time.sleep(2)
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self.assertEqual(self.cache.get("expire1"), None)
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self.cache.add("expire2", "newvalue")
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self.assertEqual(self.cache.get("expire2"), None)
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self.assertEqual(self.cache.has_key("expire3"), False)
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def test_unicode(self):
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"Unicode values are ignored by the dummy cache"
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stuff = {
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u'ascii': u'ascii_value',
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u'unicode_ascii': u'Iñtërnâtiônàlizætiøn1',
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u'Iñtërnâtiônàlizætiøn': u'Iñtërnâtiônàlizætiøn2',
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u'ascii': {u'x' : 1 }
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}
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for (key, value) in stuff.items():
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self.cache.set(key, value)
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self.assertEqual(self.cache.get(key), None)
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class BaseCacheTests(object):
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# A common set of tests to apply to all cache backends
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def test_simple(self):
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# Simple cache set/get works
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self.cache.set("key", "value")
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self.assertEqual(self.cache.get("key"), "value")
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def test_add(self):
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# A key can be added to a cache
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self.cache.add("addkey1", "value")
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result = self.cache.add("addkey1", "newvalue")
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self.assertEqual(result, False)
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self.assertEqual(self.cache.get("addkey1"), "value")
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def test_non_existent(self):
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# Non-existent cache keys return as None/default
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# get with non-existent keys
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self.assertEqual(self.cache.get("does_not_exist"), None)
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self.assertEqual(self.cache.get("does_not_exist", "bang!"), "bang!")
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def test_get_many(self):
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# Multiple cache keys can be returned using get_many
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self.cache.set('a', 'a')
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self.cache.set('b', 'b')
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self.cache.set('c', 'c')
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self.cache.set('d', 'd')
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self.assertEqual(self.cache.get_many(['a', 'c', 'd']), {'a' : 'a', 'c' : 'c', 'd' : 'd'})
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self.assertEqual(self.cache.get_many(['a', 'b', 'e']), {'a' : 'a', 'b' : 'b'})
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def test_delete(self):
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# Cache keys can be deleted
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self.cache.set("key1", "spam")
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self.cache.set("key2", "eggs")
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self.assertEqual(self.cache.get("key1"), "spam")
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self.cache.delete("key1")
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self.assertEqual(self.cache.get("key1"), None)
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self.assertEqual(self.cache.get("key2"), "eggs")
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def test_has_key(self):
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# The cache can be inspected for cache keys
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self.cache.set("hello1", "goodbye1")
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self.assertEqual(self.cache.has_key("hello1"), True)
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self.assertEqual(self.cache.has_key("goodbye1"), False)
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def test_in(self):
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# The in operator can be used to inspet cache contents
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self.cache.set("hello2", "goodbye2")
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self.assertEqual("hello2" in self.cache, True)
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self.assertEqual("goodbye2" in self.cache, False)
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def test_incr(self):
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# Cache values can be incremented
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self.cache.set('answer', 41)
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self.assertEqual(self.cache.incr('answer'), 42)
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self.assertEqual(self.cache.get('answer'), 42)
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self.assertEqual(self.cache.incr('answer', 10), 52)
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self.assertEqual(self.cache.get('answer'), 52)
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self.assertRaises(ValueError, self.cache.incr, 'does_not_exist')
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def test_decr(self):
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# Cache values can be decremented
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self.cache.set('answer', 43)
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self.assertEqual(self.cache.decr('answer'), 42)
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self.assertEqual(self.cache.get('answer'), 42)
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self.assertEqual(self.cache.decr('answer', 10), 32)
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self.assertEqual(self.cache.get('answer'), 32)
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self.assertRaises(ValueError, self.cache.decr, 'does_not_exist')
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def test_data_types(self):
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# Many different data types can be cached
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stuff = {
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'string' : 'this is a string',
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'int' : 42,
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'list' : [1, 2, 3, 4],
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'tuple' : (1, 2, 3, 4),
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'dict' : {'A': 1, 'B' : 2},
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'function' : f,
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'class' : C,
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}
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self.cache.set("stuff", stuff)
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self.assertEqual(self.cache.get("stuff"), stuff)
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def test_expiration(self):
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# Cache values can be set to expire
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self.cache.set('expire1', 'very quickly', 1)
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self.cache.set('expire2', 'very quickly', 1)
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self.cache.set('expire3', 'very quickly', 1)
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time.sleep(2)
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self.assertEqual(self.cache.get("expire1"), None)
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self.cache.add("expire2", "newvalue")
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self.assertEqual(self.cache.get("expire2"), "newvalue")
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self.assertEqual(self.cache.has_key("expire3"), False)
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def test_unicode(self):
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# Unicode values can be cached
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stuff = {
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u'ascii': u'ascii_value',
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u'unicode_ascii': u'Iñtërnâtiônàlizætiøn1',
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u'Iñtërnâtiônàlizætiøn': u'Iñtërnâtiônàlizætiøn2',
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u'ascii': {u'x' : 1 }
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}
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for (key, value) in stuff.items():
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self.cache.set(key, value)
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self.assertEqual(self.cache.get(key), value)
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class DBCacheTests(unittest.TestCase, BaseCacheTests):
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def setUp(self):
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management.call_command('createcachetable', 'test_cache_table', verbosity=0, interactive=False)
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self.cache = get_cache('db://test_cache_table')
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def tearDown(self):
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from django.db import connection
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cursor = connection.cursor()
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cursor.execute('DROP TABLE test_cache_table');
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class LocMemCacheTests(unittest.TestCase, BaseCacheTests):
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def setUp(self):
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self.cache = get_cache('locmem://')
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# memcached backend isn't guaranteed to be available.
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# To check the memcached backend, the test settings file will
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# need to contain a CACHE_BACKEND setting that points at
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# your memcache server.
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if settings.CACHE_BACKEND.startswith('memcached://'):
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class MemcachedCacheTests(unittest.TestCase, BaseCacheTests):
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def setUp(self):
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self.cache = get_cache(settings.CACHE_BACKEND)
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class FileBasedCacheTests(unittest.TestCase, BaseCacheTests):
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"""
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Specific test cases for the file-based cache.
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"""
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def setUp(self):
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self.dirname = tempfile.mkdtemp()
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self.cache = get_cache('file://%s' % self.dirname)
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def tearDown(self):
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shutil.rmtree(self.dirname)
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def test_hashing(self):
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"""Test that keys are hashed into subdirectories correctly"""
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self.cache.set("foo", "bar")
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keyhash = md5_constructor("foo").hexdigest()
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keypath = os.path.join(self.dirname, keyhash[:2], keyhash[2:4], keyhash[4:])
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self.assert_(os.path.exists(keypath))
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def test_subdirectory_removal(self):
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"""
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Make sure that the created subdirectories are correctly removed when empty.
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"""
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self.cache.set("foo", "bar")
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keyhash = md5_constructor("foo").hexdigest()
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keypath = os.path.join(self.dirname, keyhash[:2], keyhash[2:4], keyhash[4:])
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self.assert_(os.path.exists(keypath))
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self.cache.delete("foo")
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self.assert_(not os.path.exists(keypath))
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self.assert_(not os.path.exists(os.path.dirname(keypath)))
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self.assert_(not os.path.exists(os.path.dirname(os.path.dirname(keypath))))
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class CacheUtils(unittest.TestCase):
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"""TestCase for django.utils.cache functions."""
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def setUp(self):
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self.path = '/cache/test/'
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self.old_settings_key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
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self.old_middleware_seconds = settings.CACHE_MIDDLEWARE_SECONDS
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settings.CACHE_MIDDLEWARE_KEY_PREFIX = 'settingsprefix'
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settings.CACHE_MIDDLEWARE_SECONDS = 1
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def tearDown(self):
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settings.CACHE_MIDDLEWARE_KEY_PREFIX = self.old_settings_key_prefix
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settings.CACHE_MIDDLEWARE_SECONDS = self.old_middleware_seconds
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def _get_request(self, path):
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request = HttpRequest()
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request.META = {
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'SERVER_NAME': 'testserver',
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'SERVER_PORT': 80,
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}
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request.path = request.path_info = "/cache/%s" % path
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return request
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def test_patch_vary_headers(self):
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headers = (
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# Initial vary, new headers, resulting vary.
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(None, ('Accept-Encoding',), 'Accept-Encoding'),
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('Accept-Encoding', ('accept-encoding',), 'Accept-Encoding'),
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('Accept-Encoding', ('ACCEPT-ENCODING',), 'Accept-Encoding'),
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('Cookie', ('Accept-Encoding',), 'Cookie, Accept-Encoding'),
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('Cookie, Accept-Encoding', ('Accept-Encoding',), 'Cookie, Accept-Encoding'),
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('Cookie, Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
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(None, ('Accept-Encoding', 'COOKIE'), 'Accept-Encoding, COOKIE'),
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('Cookie, Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
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('Cookie , Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
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)
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for initial_vary, newheaders, resulting_vary in headers:
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response = HttpResponse()
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if initial_vary is not None:
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response['Vary'] = initial_vary
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patch_vary_headers(response, newheaders)
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self.assertEqual(response['Vary'], resulting_vary)
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def test_get_cache_key(self):
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request = self._get_request(self.path)
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response = HttpResponse()
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key_prefix = 'localprefix'
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# Expect None if no headers have been set yet.
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self.assertEqual(get_cache_key(request), None)
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# Set headers to an empty list.
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learn_cache_key(request, response)
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self.assertEqual(get_cache_key(request), 'views.decorators.cache.cache_page.settingsprefix.a8c87a3d8c44853d7f79474f7ffe4ad5.d41d8cd98f00b204e9800998ecf8427e')
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# Verify that a specified key_prefix is taken in to account.
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learn_cache_key(request, response, key_prefix=key_prefix)
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self.assertEqual(get_cache_key(request, key_prefix=key_prefix), 'views.decorators.cache.cache_page.localprefix.a8c87a3d8c44853d7f79474f7ffe4ad5.d41d8cd98f00b204e9800998ecf8427e')
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def test_learn_cache_key(self):
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request = self._get_request(self.path)
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response = HttpResponse()
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response['Vary'] = 'Pony'
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# Make sure that the Vary header is added to the key hash
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learn_cache_key(request, response)
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self.assertEqual(get_cache_key(request), 'views.decorators.cache.cache_page.settingsprefix.a8c87a3d8c44853d7f79474f7ffe4ad5.d41d8cd98f00b204e9800998ecf8427e')
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if __name__ == '__main__':
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unittest.main()
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