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Viewing changes to bzrlib/tests/per_lock/test_lock.py

  • Committer: Alexander Belchenko
  • Date: 2006-07-30 16:43:12 UTC
  • mto: (1711.2.111 jam-integration)
  • mto: This revision was merged to the branch mainline in revision 1906.
  • Revision ID: bialix@ukr.net-20060730164312-b025fd3ff0cee59e
rename  gpl.txt => COPYING.txt

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bzrlib/tests/per_lock/test_lock.py
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# Copyright (C) 2007 Canonical Ltd
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#
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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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#
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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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#
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Tests for OS level locks."""
18
 
 
19
 
from bzrlib import (
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    errors,
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    osutils,
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    )
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24
 
from bzrlib.tests import UnicodeFilenameFeature
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from bzrlib.tests.per_lock import TestCaseWithLock
26
 
 
27
 
 
28
 
class TestLock(TestCaseWithLock):
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30
 
    def setUp(self):
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        super(TestLock, self).setUp()
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        self.build_tree(['a-file'])
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34
 
    def test_read_lock(self):
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        """Smoke test for read locks."""
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        a_lock = self.read_lock('a-file')
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        self.addCleanup(a_lock.unlock)
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        # The lock file should be opened for reading
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        txt = a_lock.f.read()
40
 
        self.assertEqual('contents of a-file\n', txt)
41
 
 
42
 
    def test_create_if_needed_read(self):
43
 
        """We will create the file if it doesn't exist yet."""
44
 
        a_lock = self.read_lock('other-file')
45
 
        self.addCleanup(a_lock.unlock)
46
 
        txt = a_lock.f.read()
47
 
        self.assertEqual('', txt)
48
 
 
49
 
    def test_create_if_needed_write(self):
50
 
        """We will create the file if it doesn't exist yet."""
51
 
        a_lock = self.write_lock('other-file')
52
 
        self.addCleanup(a_lock.unlock)
53
 
        txt = a_lock.f.read()
54
 
        self.assertEqual('', txt)
55
 
        a_lock.f.seek(0)
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        a_lock.f.write('foo\n')
57
 
        a_lock.f.seek(0)
58
 
        txt = a_lock.f.read()
59
 
        self.assertEqual('foo\n', txt)
60
 
 
61
 
    def test_readonly_file(self):
62
 
        """If the file is readonly, we can take a read lock.
63
 
 
64
 
        But we shouldn't be able to take a write lock.
65
 
        """
66
 
        osutils.make_readonly('a-file')
67
 
        # Make sure the file is read-only (on all platforms)
68
 
        self.assertRaises(IOError, open, 'a-file', 'rb+')
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        a_lock = self.read_lock('a-file')
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        a_lock.unlock()
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72
 
        self.assertRaises(errors.LockFailed, self.write_lock, 'a-file')
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74
 
    def test_write_lock(self):
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        """Smoke test for write locks."""
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        a_lock = self.write_lock('a-file')
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        self.addCleanup(a_lock.unlock)
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        # You should be able to read and write to the lock file.
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        txt = a_lock.f.read()
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        self.assertEqual('contents of a-file\n', txt)
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        # Win32 requires that you call seek() when switching between a read
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        # operation and a write operation.
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        a_lock.f.seek(0, 2)
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        a_lock.f.write('more content\n')
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        a_lock.f.seek(0)
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        txt = a_lock.f.read()
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        self.assertEqual('contents of a-file\nmore content\n', txt)
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    def test_multiple_read_locks(self):
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        """You can take out more than one read lock on the same file."""
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        a_lock = self.read_lock('a-file')
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        self.addCleanup(a_lock.unlock)
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        b_lock = self.read_lock('a-file')
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        self.addCleanup(b_lock.unlock)
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    def test_multiple_write_locks_exclude(self):
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        """Taking out more than one write lock should fail."""
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        a_lock = self.write_lock('a-file')
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        self.addCleanup(a_lock.unlock)
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        # Taking out a lock on a locked file should raise LockContention
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        self.assertRaises(errors.LockContention, self.write_lock, 'a-file')
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    def _disabled_test_read_then_write_excludes(self):
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        """If a file is read-locked, taking out a write lock should fail."""
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        a_lock = self.read_lock('a-file')
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        self.addCleanup(a_lock.unlock)
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        # Taking out a lock on a locked file should raise LockContention
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        self.assertRaises(errors.LockContention, self.write_lock, 'a-file')
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    def test_read_unlock_write(self):
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        """Make sure that unlocking allows us to lock write"""
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        a_lock = self.read_lock('a-file')
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        a_lock.unlock()
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        a_lock = self.write_lock('a-file')
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        a_lock.unlock()
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    # TODO: jam 20070319 fcntl read locks are not currently fully
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    #       mutually exclusive with write locks. This will be fixed
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    #       in the next release.
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    def _disabled_test_write_then_read_excludes(self):
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        """If a file is write-locked, taking out a read lock should fail.
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123
 
        The file is exclusively owned by the write lock, so we shouldn't be
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        able to take out a shared read lock.
125
 
        """
126
 
        a_lock = self.write_lock('a-file')
127
 
        self.addCleanup(a_lock.unlock)
128
 
        # Taking out a lock on a locked file should raise LockContention
129
 
        self.assertRaises(errors.LockContention, self.read_lock, 'a-file')
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131
 
    # TODO: jam 20070319 fcntl write locks are not currently fully
132
 
    #       mutually exclusive with read locks. This will be fixed
133
 
    #       in the next release.
134
 
    def _disabled_test_write_unlock_read(self):
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        """If we have removed the write lock, we can grab a read lock."""
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        a_lock = self.write_lock('a-file')
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        a_lock.unlock()
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        a_lock = self.read_lock('a-file')
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        a_lock.unlock()
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    def _disabled_test_multiple_read_unlock_write(self):
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        """We can only grab a write lock if all read locks are done."""
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        a_lock = b_lock = c_lock = None
144
 
        try:
145
 
            a_lock = self.read_lock('a-file')
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            b_lock = self.read_lock('a-file')
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            self.assertRaises(errors.LockContention, self.write_lock, 'a-file')
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            a_lock.unlock()
149
 
            a_lock = None
150
 
            self.assertRaises(errors.LockContention, self.write_lock, 'a-file')
151
 
            b_lock.unlock()
152
 
            b_lock = None
153
 
            c_lock = self.write_lock('a-file')
154
 
            c_lock.unlock()
155
 
            c_lock = None
156
 
        finally:
157
 
            # Cleanup as needed
158
 
            if a_lock is not None:
159
 
                a_lock.unlock()
160
 
            if b_lock is not None:
161
 
                b_lock.unlock()
162
 
            if c_lock is not None:
163
 
                c_lock.unlock()
164
 
 
165
 
 
166
 
class TestLockUnicodePath(TestCaseWithLock):
167
 
 
168
 
    _test_needs_features = [UnicodeFilenameFeature]
169
 
 
170
 
    def test_read_lock(self):
171
 
        self.build_tree([u'\u1234'])
172
 
        u_lock = self.read_lock(u'\u1234')
173
 
        self.addCleanup(u_lock.unlock)
174
 
 
175
 
    def test_write_lock(self):
176
 
        self.build_tree([u'\u1234'])
177
 
        u_lock = self.write_lock(u'\u1234')
178
 
        self.addCleanup(u_lock.unlock)