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Viewing changes to bzrlib/tests/test_lockable_files.py

  • Committer: Canonical.com Patch Queue Manager
  • Date: 2008-03-28 03:28:01 UTC
  • mfrom: (3311.1.1 ianc-integration)
  • Revision ID: pqm@pqm.ubuntu.com-20080328032801-o2sda79zu2g6ckxg
Reduced the evangelism in the User Guide (Ian Clatworthy)

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# Copyright (C) 2005-2010 Canonical Ltd
 
1
# Copyright (C) 2005, 2006 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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#
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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
15
 
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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16
 
17
17
from StringIO import StringIO
18
18
 
24
24
    )
25
25
from bzrlib.errors import BzrBadParameterNotString, NoSuchFile, ReadOnlyError
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26
from bzrlib.lockable_files import LockableFiles, TransportLock
27
 
from bzrlib.symbol_versioning import (
28
 
    deprecated_in,
29
 
    )
30
 
from bzrlib.tests import (
31
 
    TestCaseInTempDir,
32
 
    TestNotApplicable,
33
 
    )
 
27
from bzrlib.tests import TestCaseInTempDir
34
28
from bzrlib.tests.test_smart import TestCaseWithSmartMedium
35
29
from bzrlib.tests.test_transactions import DummyWeave
36
30
from bzrlib.transactions import (PassThroughTransaction,
41
35
 
42
36
 
43
37
# these tests are applied in each parameterized suite for LockableFiles
44
 
#
45
 
# they use an old style of parameterization, but we want to remove this class
46
 
# so won't modernize them now. - mbp 20080430
47
38
class _TestLockableFiles_mixin(object):
48
39
 
 
40
    def test_read_write(self):
 
41
        self.assertRaises(NoSuchFile, self.lockable.get, 'foo')
 
42
        self.assertRaises(NoSuchFile, self.lockable.get_utf8, 'foo')
 
43
        self.lockable.lock_write()
 
44
        try:
 
45
            unicode_string = u'bar\u1234'
 
46
            self.assertEqual(4, len(unicode_string))
 
47
            byte_string = unicode_string.encode('utf-8')
 
48
            self.assertEqual(6, len(byte_string))
 
49
            self.assertRaises(UnicodeEncodeError, self.lockable.put, 'foo',
 
50
                              StringIO(unicode_string))
 
51
            self.lockable.put('foo', StringIO(byte_string))
 
52
            self.assertEqual(byte_string,
 
53
                             self.lockable.get('foo').read())
 
54
            self.assertEqual(unicode_string,
 
55
                             self.lockable.get_utf8('foo').read())
 
56
            self.assertRaises(BzrBadParameterNotString,
 
57
                              self.lockable.put_utf8,
 
58
                              'bar',
 
59
                              StringIO(unicode_string)
 
60
                              )
 
61
            self.lockable.put_utf8('bar', unicode_string)
 
62
            self.assertEqual(unicode_string,
 
63
                             self.lockable.get_utf8('bar').read())
 
64
            self.assertEqual(byte_string,
 
65
                             self.lockable.get('bar').read())
 
66
            self.lockable.put_bytes('raw', 'raw\xffbytes')
 
67
            self.assertEqual('raw\xffbytes',
 
68
                             self.lockable.get('raw').read())
 
69
        finally:
 
70
            self.lockable.unlock()
 
71
 
 
72
    def test_locks(self):
 
73
        self.lockable.lock_read()
 
74
        try:
 
75
            self.assertRaises(ReadOnlyError, self.lockable.put, 'foo', 
 
76
                              StringIO('bar\u1234'))
 
77
        finally:
 
78
            self.lockable.unlock()
 
79
 
49
80
    def test_transactions(self):
50
81
        self.assertIs(self.lockable.get_transaction().__class__,
51
82
                      PassThroughTransaction)
68
99
 
69
100
    def test__escape(self):
70
101
        self.assertEqual('%25', self.lockable._escape('%'))
71
 
 
 
102
        
72
103
    def test__escape_empty(self):
73
104
        self.assertEqual('', self.lockable._escape(''))
74
105
 
80
111
        except NotImplementedError:
81
112
            # this lock cannot be broken
82
113
            self.lockable.unlock()
83
 
            raise TestNotApplicable("%r is not breakable" % (self.lockable,))
 
114
            return
84
115
        l2 = self.get_lockable()
85
116
        orig_factory = bzrlib.ui.ui_factory
86
117
        # silent ui - no need for stdout
87
 
        bzrlib.ui.ui_factory = bzrlib.ui.CannedInputUIFactory([True])
 
118
        bzrlib.ui.ui_factory = bzrlib.ui.SilentUIFactory()
 
119
        bzrlib.ui.ui_factory.stdin = StringIO("y\n")
88
120
        try:
89
121
            l2.break_lock()
90
122
        finally:
98
130
 
99
131
    def test_lock_write_returns_None_refuses_token(self):
100
132
        token = self.lockable.lock_write()
101
 
        self.addCleanup(self.lockable.unlock)
102
 
        if token is not None:
103
 
            # This test does not apply, because this lockable supports
104
 
            # tokens.
105
 
            raise TestNotApplicable("%r uses tokens" % (self.lockable,))
106
 
        self.assertRaises(errors.TokenLockingNotSupported,
107
 
                          self.lockable.lock_write, token='token')
 
133
        try:
 
134
            if token is not None:
 
135
                # This test does not apply, because this lockable supports
 
136
                # tokens.
 
137
                return
 
138
            self.assertRaises(errors.TokenLockingNotSupported,
 
139
                              self.lockable.lock_write, token='token')
 
140
        finally:
 
141
            self.lockable.unlock()
108
142
 
109
143
    def test_lock_write_returns_token_when_given_token(self):
110
144
        token = self.lockable.lock_write()
111
 
        self.addCleanup(self.lockable.unlock)
112
 
        if token is None:
113
 
            # This test does not apply, because this lockable refuses
114
 
            # tokens.
115
 
            return
116
 
        new_lockable = self.get_lockable()
117
 
        token_from_new_lockable = new_lockable.lock_write(token=token)
118
 
        self.addCleanup(new_lockable.unlock)
119
 
        self.assertEqual(token, token_from_new_lockable)
 
145
        try:
 
146
            if token is None:
 
147
                # This test does not apply, because this lockable refuses
 
148
                # tokens.
 
149
                return
 
150
            new_lockable = self.get_lockable()
 
151
            token_from_new_lockable = new_lockable.lock_write(token=token)
 
152
            try:
 
153
                self.assertEqual(token, token_from_new_lockable)
 
154
            finally:
 
155
                new_lockable.unlock()
 
156
        finally:
 
157
            self.lockable.unlock()
120
158
 
121
159
    def test_lock_write_raises_on_token_mismatch(self):
122
160
        token = self.lockable.lock_write()
123
 
        self.addCleanup(self.lockable.unlock)
124
 
        if token is None:
125
 
            # This test does not apply, because this lockable refuses
126
 
            # tokens.
127
 
            return
128
 
        different_token = token + 'xxx'
129
 
        # Re-using the same lockable instance with a different token will
130
 
        # raise TokenMismatch.
131
 
        self.assertRaises(errors.TokenMismatch,
132
 
                          self.lockable.lock_write, token=different_token)
133
 
        # A separate instance for the same lockable will also raise
134
 
        # TokenMismatch.
135
 
        # This detects the case where a caller claims to have a lock (via
136
 
        # the token) for an external resource, but doesn't (the token is
137
 
        # different).  Clients need a separate lock object to make sure the
138
 
        # external resource is probed, whereas the existing lock object
139
 
        # might cache.
140
 
        new_lockable = self.get_lockable()
141
 
        self.assertRaises(errors.TokenMismatch,
142
 
                          new_lockable.lock_write, token=different_token)
 
161
        try:
 
162
            if token is None:
 
163
                # This test does not apply, because this lockable refuses
 
164
                # tokens.
 
165
                return
 
166
            different_token = token + 'xxx'
 
167
            # Re-using the same lockable instance with a different token will
 
168
            # raise TokenMismatch.
 
169
            self.assertRaises(errors.TokenMismatch,
 
170
                              self.lockable.lock_write, token=different_token)
 
171
            # A seperate instance for the same lockable will also raise
 
172
            # TokenMismatch.
 
173
            # This detects the case where a caller claims to have a lock (via
 
174
            # the token) for an external resource, but doesn't (the token is
 
175
            # different).  Clients need a seperate lock object to make sure the
 
176
            # external resource is probed, whereas the existing lock object
 
177
            # might cache.
 
178
            new_lockable = self.get_lockable()
 
179
            self.assertRaises(errors.TokenMismatch,
 
180
                              new_lockable.lock_write, token=different_token)
 
181
        finally:
 
182
            self.lockable.unlock()
143
183
 
144
184
    def test_lock_write_with_matching_token(self):
145
185
        # If the token matches, so no exception is raised by lock_write.
146
186
        token = self.lockable.lock_write()
147
 
        self.addCleanup(self.lockable.unlock)
148
 
        if token is None:
149
 
            # This test does not apply, because this lockable refuses
150
 
            # tokens.
151
 
            return
152
 
        # The same instance will accept a second lock_write if the specified
153
 
        # token matches.
154
 
        self.lockable.lock_write(token=token)
155
 
        self.lockable.unlock()
156
 
        # Calling lock_write on a new instance for the same lockable will
157
 
        # also succeed.
158
 
        new_lockable = self.get_lockable()
159
 
        new_lockable.lock_write(token=token)
160
 
        new_lockable.unlock()
 
187
        try:
 
188
            if token is None:
 
189
                # This test does not apply, because this lockable refuses
 
190
                # tokens.
 
191
                return
 
192
            # The same instance will accept a second lock_write if the specified
 
193
            # token matches.
 
194
            self.lockable.lock_write(token=token)
 
195
            self.lockable.unlock()
 
196
            # Calling lock_write on a new instance for the same lockable will
 
197
            # also succeed.
 
198
            new_lockable = self.get_lockable()
 
199
            new_lockable.lock_write(token=token)
 
200
            new_lockable.unlock()
 
201
        finally:
 
202
            self.lockable.unlock()
161
203
 
162
204
    def test_unlock_after_lock_write_with_token(self):
163
205
        # If lock_write did not physically acquire the lock (because it was
164
206
        # passed a token), then unlock should not physically release it.
165
207
        token = self.lockable.lock_write()
166
 
        self.addCleanup(self.lockable.unlock)
167
 
        if token is None:
168
 
            # This test does not apply, because this lockable refuses
169
 
            # tokens.
170
 
            return
171
 
        new_lockable = self.get_lockable()
172
 
        new_lockable.lock_write(token=token)
173
 
        new_lockable.unlock()
174
 
        self.assertTrue(self.lockable.get_physical_lock_status())
 
208
        try:
 
209
            if token is None:
 
210
                # This test does not apply, because this lockable refuses
 
211
                # tokens.
 
212
                return
 
213
            new_lockable = self.get_lockable()
 
214
            new_lockable.lock_write(token=token)
 
215
            new_lockable.unlock()
 
216
            self.assertTrue(self.lockable.get_physical_lock_status())
 
217
        finally:
 
218
            self.lockable.unlock()
175
219
 
176
220
    def test_lock_write_with_token_fails_when_unlocked(self):
177
221
        # Lock and unlock to get a superficially valid token.  This mimics a
242
286
        # But should be relockable with a token.
243
287
        self.lockable.lock_write(token=token)
244
288
        self.lockable.unlock()
245
 
        # Cleanup: we should still be able to get the lock, but we restore the
246
 
        # behavior to clearing the lock when unlocking.
247
 
        self.lockable.lock_write(token=token)
248
 
        self.lockable.dont_leave_in_place()
249
 
        self.lockable.unlock()
250
289
 
251
290
    def test_dont_leave_in_place(self):
252
291
        token = self.lockable.lock_write()
271
310
        third_lockable.unlock()
272
311
 
273
312
 
274
 
# This method of adapting tests to parameters is different to
275
 
# the TestProviderAdapters used elsewhere, but seems simpler for this
276
 
# case.
 
313
# This method of adapting tests to parameters is different to 
 
314
# the TestProviderAdapters used elsewhere, but seems simpler for this 
 
315
# case.  
277
316
class TestLockableFiles_TransportLock(TestCaseInTempDir,
278
317
                                      _TestLockableFiles_mixin):
279
318
 
285
324
        self.lockable = self.get_lockable()
286
325
        self.lockable.create_lock()
287
326
 
288
 
    def stop_server(self):
289
 
        super(TestLockableFiles_TransportLock, self).stop_server()
 
327
    def tearDown(self):
 
328
        super(TestLockableFiles_TransportLock, self).tearDown()
290
329
        # free the subtransport so that we do not get a 5 second
291
330
        # timeout due to the SFTP connection cache.
292
 
        try:
293
 
            del self.sub_transport
294
 
        except AttributeError:
295
 
            pass
 
331
        del self.sub_transport
296
332
 
297
333
    def get_lockable(self):
298
334
        return LockableFiles(self.sub_transport, 'my-lock', TransportLock)
299
 
 
 
335
        
300
336
 
301
337
class TestLockableFiles_LockDir(TestCaseInTempDir,
302
338
                              _TestLockableFiles_mixin):
306
342
        TestCaseInTempDir.setUp(self)
307
343
        self.transport = get_transport('.')
308
344
        self.lockable = self.get_lockable()
309
 
        # the lock creation here sets mode - test_permissions on branch
310
 
        # tests that implicitly, but it might be a good idea to factor
 
345
        # the lock creation here sets mode - test_permissions on branch 
 
346
        # tests that implicitly, but it might be a good idea to factor 
311
347
        # out the mode checking logic and have it applied to loackable files
312
348
        # directly. RBC 20060418
313
349
        self.lockable.create_lock()