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# Copyright (C) 2005-2009, 2011 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import os
import stat
import time
from bzrlib import osutils
from bzrlib.errors import BzrError
from bzrlib.hashcache import HashCache
from bzrlib.tests import (
TestCaseInTempDir,
)
from bzrlib.tests.features import (
OsFifoFeature,
)
sha1 = osutils.sha_string
def pause():
time.sleep(5.0)
class TestHashCache(TestCaseInTempDir):
"""Test the hashcache against a real directory"""
def make_hashcache(self):
# make a dummy bzr directory just to hold the cache
os.mkdir('.bzr')
hc = HashCache('.', '.bzr/stat-cache')
return hc
def reopen_hashcache(self):
hc = HashCache('.', '.bzr/stat-cache')
hc.read()
return hc
def test_hashcache_initial_miss(self):
"""Get correct hash from an empty hashcache"""
hc = self.make_hashcache()
self.build_tree_contents([('foo', 'hello')])
self.assertEquals(hc.get_sha1('foo'),
'aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d')
self.assertEquals(hc.miss_count, 1)
self.assertEquals(hc.hit_count, 0)
def test_hashcache_new_file(self):
hc = self.make_hashcache()
self.build_tree_contents([('foo', 'goodbye')])
# now read without pausing; it may not be possible to cache it as its
# so new
self.assertEquals(hc.get_sha1('foo'), sha1('goodbye'))
def test_hashcache_nonexistent_file(self):
hc = self.make_hashcache()
self.assertEquals(hc.get_sha1('no-name-yet'), None)
def test_hashcache_replaced_file(self):
hc = self.make_hashcache()
self.build_tree_contents([('foo', 'goodbye')])
self.assertEquals(hc.get_sha1('foo'), sha1('goodbye'))
os.remove('foo')
self.assertEquals(hc.get_sha1('foo'), None)
self.build_tree_contents([('foo', 'new content')])
self.assertEquals(hc.get_sha1('foo'), sha1('new content'))
def test_hashcache_not_file(self):
hc = self.make_hashcache()
self.build_tree(['subdir/'])
self.assertEquals(hc.get_sha1('subdir'), None)
def test_hashcache_load(self):
hc = self.make_hashcache()
self.build_tree_contents([('foo', 'contents')])
pause()
self.assertEquals(hc.get_sha1('foo'), sha1('contents'))
hc.write()
hc = self.reopen_hashcache()
self.assertEquals(hc.get_sha1('foo'), sha1('contents'))
self.assertEquals(hc.hit_count, 1)
def test_hammer_hashcache(self):
hc = self.make_hashcache()
for i in xrange(10000):
self.log('start writing at %s', time.time())
f = file('foo', 'w')
try:
last_content = '%08x' % i
f.write(last_content)
finally:
f.close()
last_sha1 = sha1(last_content)
self.log("iteration %d: %r -> %r",
i, last_content, last_sha1)
got_sha1 = hc.get_sha1('foo')
self.assertEquals(got_sha1, last_sha1)
hc.write()
hc = self.reopen_hashcache()
def test_hashcache_raise(self):
"""check that hashcache can raise BzrError"""
self.requireFeature(OsFifoFeature)
hc = self.make_hashcache()
os.mkfifo('a')
# It's possible that the system supports fifos but the filesystem
# can't. In that case we should skip at this point. But in fact
# such combinations don't usually occur for the filesystem where
# people test bzr.
self.assertRaises(BzrError, hc.get_sha1, 'a')
class FakeHashCache(HashCache):
"""Hashcache that consults a fake clock rather than the real one.
This lets us examine how old or new files would be handled, without
actually having to wait for time to pass.
"""
def __init__(self):
# set root and cache file name to none to make sure we won't touch the
# real filesystem
HashCache.__init__(self, '.', 'hashcache')
self._files = {}
# simulated clock running forward as operations happen
self._clock = 0
def put_file(self, filename, file_contents):
abspath = './' + filename
self._files[abspath] = (file_contents, self._clock)
def _fingerprint(self, abspath, fs=None):
entry = self._files[abspath]
return (len(entry[0]),
entry[1], entry[1],
10, 20,
stat.S_IFREG | 0600)
def _really_sha1_file(self, abspath, filters):
if abspath in self._files:
return sha1(self._files[abspath][0])
else:
return None
def _cutoff_time(self):
return self._clock - 2
def pretend_to_sleep(self, secs):
self._clock += secs
class TestHashCacheFakeFilesystem(TestCaseInTempDir):
"""Tests the hashcache using a simulated OS.
"""
def make_hashcache(self):
return FakeHashCache()
def test_hashcache_miss_new_file(self):
"""A new file gives the right sha1 but misses"""
hc = self.make_hashcache()
hc.put_file('foo', 'hello')
self.assertEquals(hc.get_sha1('foo'), sha1('hello'))
self.assertEquals(hc.miss_count, 1)
self.assertEquals(hc.hit_count, 0)
# if we try again it's still too new;
self.assertEquals(hc.get_sha1('foo'), sha1('hello'))
self.assertEquals(hc.miss_count, 2)
self.assertEquals(hc.hit_count, 0)
def test_hashcache_old_file(self):
"""An old file gives the right sha1 and hits"""
hc = self.make_hashcache()
hc.put_file('foo', 'hello')
hc.pretend_to_sleep(20)
# file is new; should get the correct hash but miss
self.assertEquals(hc.get_sha1('foo'), sha1('hello'))
self.assertEquals(hc.miss_count, 1)
self.assertEquals(hc.hit_count, 0)
# and can now be hit
self.assertEquals(hc.get_sha1('foo'), sha1('hello'))
self.assertEquals(hc.miss_count, 1)
self.assertEquals(hc.hit_count, 1)
hc.pretend_to_sleep(3)
# and again
self.assertEquals(hc.get_sha1('foo'), sha1('hello'))
self.assertEquals(hc.miss_count, 1)
self.assertEquals(hc.hit_count, 2)
def test_hashcache_invalidates(self):
hc = self.make_hashcache()
hc.put_file('foo', 'hello')
hc.pretend_to_sleep(20)
hc.get_sha1('foo')
hc.put_file('foo', 'h1llo')
self.assertEquals(hc.get_sha1('foo'), sha1('h1llo'))
self.assertEquals(hc.miss_count, 2)
self.assertEquals(hc.hit_count, 0)
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