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bzrlib/tests/test_lockable_files.py
 
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# Copyright (C) 2005, 2006 by Canonical Ltd
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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from StringIO import StringIO
 
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from bzrlib.branch import Branch
 
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from bzrlib.errors import BzrBadParameterNotString, NoSuchFile, ReadOnlyError
 
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from bzrlib.lockable_files import LockableFiles, TransportLock
 
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from bzrlib.lockdir import LockDir
 
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from bzrlib.tests import TestCaseInTempDir
 
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from bzrlib.transactions import (PassThroughTransaction,
 
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                                 ReadOnlyTransaction,
 
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                                 WriteTransaction,
 
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                                 )
 
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from bzrlib.transport import get_transport
 
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# these tests are applied in each parameterized suite for LockableFiles
 
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class _TestLockableFiles_mixin(object):
 
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    def test_read_write(self):
 
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        self.assertRaises(NoSuchFile, self.lockable.get, 'foo')
 
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        self.assertRaises(NoSuchFile, self.lockable.get_utf8, 'foo')
 
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        self.lockable.lock_write()
 
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        try:
 
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            unicode_string = u'bar\u1234'
 
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            self.assertEqual(4, len(unicode_string))
 
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            byte_string = unicode_string.encode('utf-8')
 
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            self.assertEqual(6, len(byte_string))
 
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            self.assertRaises(UnicodeEncodeError, self.lockable.put, 'foo', 
 
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                              StringIO(unicode_string))
 
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            self.lockable.put('foo', StringIO(byte_string))
 
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            self.assertEqual(byte_string,
 
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                             self.lockable.get('foo').read())
 
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            self.assertEqual(unicode_string,
 
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                             self.lockable.get_utf8('foo').read())
 
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            self.assertRaises(BzrBadParameterNotString,
 
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                              self.lockable.put_utf8,
 
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                              'bar',
 
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                              StringIO(unicode_string)
 
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                              )
 
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            self.lockable.put_utf8('bar', unicode_string)
 
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            self.assertEqual(unicode_string, 
 
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                             self.lockable.get_utf8('bar').read())
 
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            self.assertEqual(byte_string, 
 
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                             self.lockable.get('bar').read())
 
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        finally:
 
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            self.lockable.unlock()
 
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    def test_locks(self):
 
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        self.lockable.lock_read()
 
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        try:
 
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            self.assertRaises(ReadOnlyError, self.lockable.put, 'foo', 
 
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                              StringIO('bar\u1234'))
 
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        finally:
 
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            self.lockable.unlock()
 
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    def test_transactions(self):
 
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        self.assertIs(self.lockable.get_transaction().__class__,
 
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                      PassThroughTransaction)
 
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        self.lockable.lock_read()
 
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        try:
 
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            self.assertIs(self.lockable.get_transaction().__class__,
 
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                          ReadOnlyTransaction)
 
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        finally:
 
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            self.lockable.unlock()
 
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        self.assertIs(self.lockable.get_transaction().__class__,
 
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                      PassThroughTransaction)
 
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        self.lockable.lock_write()
 
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        self.assertIs(self.lockable.get_transaction().__class__,
 
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                      WriteTransaction)
 
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        self.lockable.unlock()
 
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    def test__escape(self):
 
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        self.assertEqual('%25', self.lockable._escape('%'))
 
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    def test__escape_empty(self):
 
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        self.assertEqual('', self.lockable._escape(''))
 
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# This method of adapting tests to parameters is different to 
 
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# the TestProviderAdapters used elsewhere, but seems simpler for this 
 
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# case.  
 
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class TestLockableFiles_TransportLock(TestCaseInTempDir,
 
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                                      _TestLockableFiles_mixin):
 
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    def setUp(self):
 
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        super(TestLockableFiles_TransportLock, self).setUp()
 
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        transport = get_transport('.')
 
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        transport.mkdir('.bzr')
 
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        sub_transport = transport.clone('.bzr')
 
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        self.lockable = LockableFiles(sub_transport, 'my-lock', TransportLock)
 
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        self.lockable.create_lock()
 
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class TestLockableFiles_LockDir(TestCaseInTempDir,
 
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                              _TestLockableFiles_mixin):
 
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    """LockableFile tests run with LockDir underneath"""
 
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    def setUp(self):
 
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        super(TestLockableFiles_LockDir, self).setUp()
 
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        self.transport = get_transport('.')
 
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        self.lockable = LockableFiles(self.transport, 'my-lock', LockDir)
 
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        self.lockable.create_lock()
 
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    def test_lock_is_lockdir(self):
 
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        """Created instance should use a LockDir.
 
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        This primarily tests the mixin adapter works properly.
 
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        """
 
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        ## self.assertIsInstance(self.lockable, LockableFiles)
 
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        ## self.assertIsInstance(self.lockable._lock_strategy,
 
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                              ## LockDirStrategy)
 
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    def test_lock_created(self):
 
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        self.assertTrue(self.transport.has('my-lock'))
 
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        self.lockable.lock_write()
 
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        self.assertTrue(self.transport.has('my-lock/held/info'))
 
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        self.lockable.unlock()
 
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        self.assertFalse(self.transport.has('my-lock/held/info'))
 
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        self.assertTrue(self.transport.has('my-lock'))
 
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    # TODO: Test the lockdir inherits the right file and directory permissions
 
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    # from the LockableFiles.