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# Copyright 2012 Canonical Ltd.
# This file is part of lazr.restfulclient.
#
# lazr.restfulclient is free software: you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation, version 3 of the
# License.
#
# lazr.restfulclient is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with lazr.restfulclient. If not, see <http://www.gnu.org/licenses/>.
"""Tests for the atomic file cache."""
__metaclass__ = type
import shutil
import tempfile
import unittest
import sys
PY3 = sys.version_info[0] >= 3
if PY3:
binary_type = bytes
else:
binary_type = str
import httplib2
from lazr.restfulclient._browser import (
AtomicFileCache, safename)
class TestFileCacheInterface(unittest.TestCase):
"""Tests for ``AtomicFileCache``."""
file_cache_factory = httplib2.FileCache
unicode_bytes = b'pa\xc9\xaa\xce\xb8\xc9\x99n'
unicode_text = unicode_bytes.decode('utf-8')
def setUp(self):
super(TestFileCacheInterface, self).setUp()
self.cache_dir = tempfile.mkdtemp()
def tearDown(self):
shutil.rmtree(self.cache_dir)
super(TestFileCacheInterface, self).tearDown()
def make_file_cache(self):
"""Make a FileCache-like object to be tested."""
return self.file_cache_factory(self.cache_dir, safename)
def test_get_non_existent_key(self):
# get() returns None if the key does not exist.
cache = self.make_file_cache()
self.assertIs(None, cache.get('nonexistent'))
def test_set_key(self):
# A key set with set() can be got by get().
cache = self.make_file_cache()
cache.set('key', b'value')
self.assertEqual(b'value', cache.get('key'))
def test_set_twice_overrides(self):
# Setting a key again overrides the value.
cache = self.make_file_cache()
cache.set('key', b'value')
cache.set('key', b'new-value')
self.assertEqual(b'new-value', cache.get('key'))
def test_delete_absent_key(self):
# Deleting a key that's not there does nothing.
cache = self.make_file_cache()
cache.delete('nonexistent')
self.assertIs(None, cache.get('nonexistent'))
def test_delete_key(self):
# A key once set can be deleted. Further attempts to get that key
# return None.
cache = self.make_file_cache()
cache.set('key', b'value')
cache.delete('key')
self.assertIs(None, cache.get('key'))
def test_get_non_string_key(self):
# get() raises TypeError if asked to get a non-string key.
cache = self.make_file_cache()
self.assertRaises(TypeError, cache.get, 42)
def test_delete_non_string_key(self):
# delete() raises TypeError if asked to delete a non-string key.
cache = self.make_file_cache()
self.assertRaises(TypeError, cache.delete, 42)
def test_set_non_string_key(self):
# set() raises TypeError if asked to set a non-string key.
cache = self.make_file_cache()
self.assertRaises(TypeError, cache.set, 42, 'the answer')
def test_set_non_string_value(self):
# set() raises TypeError if asked to set a key to a non-string value.
# Attempts to retrieve that value return the empty string. This is
# probably a bug in httplib2.FileCache.
cache = self.make_file_cache()
self.assertRaises(TypeError, cache.set, 'answer', 42)
self.assertEqual(b'', cache.get('answer'))
def test_get_unicode(self):
# get() can retrieve unicode keys.
cache = self.make_file_cache()
self.assertIs(None, cache.get(self.unicode_text))
def test_set_unicode_keys(self):
cache = self.make_file_cache()
cache.set(self.unicode_text, b'value')
self.assertEqual(b'value', cache.get(self.unicode_text))
def test_set_unicode_value(self):
# set() cannot store unicode values. Values must be bytes.
cache = self.make_file_cache()
error = TypeError if PY3 else UnicodeEncodeError
self.assertRaises(
error, cache.set, 'key', self.unicode_text)
def test_delete_unicode(self):
# delete() can remove unicode keys.
cache = self.make_file_cache()
cache.set(self.unicode_text, b'value')
cache.delete(self.unicode_text)
self.assertIs(None, cache.get(self.unicode_text))
class TestAtomicFileCache(TestFileCacheInterface):
"""Tests for ``AtomicFileCache``."""
file_cache_factory = AtomicFileCache
@staticmethod
def prefix_safename(x):
if isinstance(x, binary_type):
x = x.decode('utf-8')
return AtomicFileCache.TEMPFILE_PREFIX + x
def test_set_non_string_value(self):
# set() raises TypeError if asked to set a key to a non-string value.
# Attempts to retrieve that value act is if it were never set.
#
# Note: This behaviour differs from httplib2.FileCache.
cache = self.make_file_cache()
self.assertRaises(TypeError, cache.set, 'answer', 42)
self.assertIs(None, cache.get('answer'))
# Implementation-specific tests follow.
def test_bad_safename_get(self):
safename = self.prefix_safename
cache = AtomicFileCache(self.cache_dir, safename)
self.assertRaises(ValueError, cache.get, 'key')
def test_bad_safename_set(self):
safename = self.prefix_safename
cache = AtomicFileCache(self.cache_dir, safename)
self.assertRaises(ValueError, cache.set, 'key', b'value')
def test_bad_safename_delete(self):
safename = self.prefix_safename
cache = AtomicFileCache(self.cache_dir, safename)
self.assertRaises(ValueError, cache.delete, 'key')