~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2007-2010 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

"""Tests that branch classes implement hook callouts correctly."""

from bzrlib import (

    branch as _mod_branch,

    errors,

    remote,

    revision,

    tests,

    )

from bzrlib.symbol_versioning import deprecated_in

from bzrlib.tests import test_server

class ChangeBranchTipTestCase(tests.TestCaseWithMemoryTransport):

    """Base TestCase for testing pre/post_change_branch_tip hooks."""

    def install_logging_hook(self, prefix):

        """Add a hook that logs calls made to it.

        :returns: the list that the calls will be appended to.

        """

        hook_calls = []

        _mod_branch.Branch.hooks.install_named_hook(

            prefix + '_change_branch_tip', hook_calls.append, None)

        return hook_calls

    def make_branch_with_revision_ids(self, *revision_ids):

        """Makes a branch with the given commits."""

        tree = self.make_branch_and_memory_tree('source')

        tree.lock_write()

        tree.add('')

        for revision_id in revision_ids:

            tree.commit(u'Message of ' + revision_id.decode('utf8'),

                        rev_id=revision_id)

        tree.unlock()

        branch = tree.branch

        return branch

    def assertHookCalls(self, expected_params, branch, hook_calls=None,

        pre=False):

        if hook_calls is None:

            hook_calls = self.hook_calls

        if isinstance(branch, remote.RemoteBranch):

            # For a remote branch, both the server and the client will raise

            # this hook, and we see both in the test environment. The remote

            # instance comes in between the clients - the client doe pre, the

            # server does pre, the server does post, the client does post.

            if pre:

                offset = 0

            else:

                offset = 1

            self.assertEqual(expected_params, hook_calls[offset])

            self.assertEqual(2, len(hook_calls))

        else:

            self.assertEqual([expected_params], hook_calls)

class TestOpen(tests.TestCaseWithMemoryTransport):

    def capture_hook(self, branch):

        self.hook_calls.append(branch)

    def install_hook(self):

        self.hook_calls = []

        _mod_branch.Branch.hooks.install_named_hook(

            'open', self.capture_hook, None)

    def test_create(self):

        self.install_hook()

        b = self.make_branch('.')

        if isinstance(b, remote.RemoteBranch):

            # RemoteBranch creation:

            if (self.transport_readonly_server

                == test_server.ReadonlySmartTCPServer_for_testing_v2_only):

                # Older servers:

                self.assertEqual(3, len(self.hook_calls))

                # creates the branch via the VFS (for older servers)

                self.assertEqual(b._real_branch, self.hook_calls[0])

                # creates a RemoteBranch object

                self.assertEqual(b, self.hook_calls[1])

                # get_stacked_on_url RPC

                self.assertRealBranch(self.hook_calls[2])

            else:

                self.assertEqual(2, len(self.hook_calls))

                # create_branch RPC

                self.assertRealBranch(self.hook_calls[0])

                # create RemoteBranch locally

                self.assertEqual(b, self.hook_calls[1])

        else:

            self.assertEqual([b], self.hook_calls)

    def test_open(self):

        branch_url = self.make_branch('.').bzrdir.root_transport.base

        self.install_hook()

        b = _mod_branch.Branch.open(branch_url)

        if isinstance(b, remote.RemoteBranch):

            self.assertEqual(3, len(self.hook_calls))

            # open_branchV2 RPC

            self.assertRealBranch(self.hook_calls[0])

            # create RemoteBranch locally

            self.assertEqual(b, self.hook_calls[1])

            # get_stacked_on_url RPC

            self.assertRealBranch(self.hook_calls[2])

        else:

            self.assertEqual([b], self.hook_calls)

    def assertRealBranch(self, b):

        # Branches opened on the server don't have comparable URLs, so we just

        # assert that it is not a RemoteBranch.

        self.assertIsInstance(b, _mod_branch.Branch)

        self.assertFalse(isinstance(b, remote.RemoteBranch))

class TestPreChangeBranchTip(ChangeBranchTipTestCase):

    """Tests for pre_change_branch_tip hook.

    Most of these tests are very similar to the tests in

    TestPostChangeBranchTip.

    """

    def test_hook_runs_before_change(self):

        """The hook runs *before* the branch's last_revision_info has changed.

        """

        branch = self.make_branch_with_revision_ids('revid-one')

        def assertBranchAtRevision1(params):

            self.assertEquals(

                (1, 'revid-one'), params.branch.last_revision_info())

        _mod_branch.Branch.hooks.install_named_hook(

            'pre_change_branch_tip', assertBranchAtRevision1, None)

        branch.set_last_revision_info(0, revision.NULL_REVISION)

    def test_hook_failure_prevents_change(self):

        """If a hook raises an exception, the change does not take effect."""

        branch = self.make_branch_with_revision_ids(

            'one-\xc2\xb5', 'two-\xc2\xb5')

        class PearShapedError(Exception):

            pass

        def hook_that_raises(params):

            raise PearShapedError()

        _mod_branch.Branch.hooks.install_named_hook(

            'pre_change_branch_tip', hook_that_raises, None)

        hook_failed_exc = self.assertRaises(

            PearShapedError,

            branch.set_last_revision_info, 0, revision.NULL_REVISION)

        # The revision info is unchanged.

        self.assertEqual((2, 'two-\xc2\xb5'), branch.last_revision_info())

    def test_empty_history(self):

        branch = self.make_branch('source')

        hook_calls = self.install_logging_hook('pre')

        branch.set_last_revision_info(0, revision.NULL_REVISION)

        expected_params = _mod_branch.ChangeBranchTipParams(

            branch, 0, 0, revision.NULL_REVISION, revision.NULL_REVISION)

        self.assertHookCalls(expected_params, branch, hook_calls, pre=True)

    def test_nonempty_history(self):

        # some branches require that their history be set to a revision in the

        # repository, so we need to make a branch with non-empty history for

        # this test.

        branch = self.make_branch_with_revision_ids(

            'one-\xc2\xb5', 'two-\xc2\xb5')

        hook_calls = self.install_logging_hook('pre')

        branch.set_last_revision_info(1, 'one-\xc2\xb5')

        expected_params = _mod_branch.ChangeBranchTipParams(

            branch, 2, 1, 'two-\xc2\xb5', 'one-\xc2\xb5')

        self.assertHookCalls(expected_params, branch, hook_calls, pre=True)

    def test_branch_is_locked(self):

        branch = self.make_branch('source')

        def assertBranchIsLocked(params):

            self.assertTrue(params.branch.is_locked())

        _mod_branch.Branch.hooks.install_named_hook(

            'pre_change_branch_tip', assertBranchIsLocked, None)

        branch.set_last_revision_info(0, revision.NULL_REVISION)

    def test_calls_all_hooks_no_errors(self):

        """If multiple hooks are registered, all are called (if none raise

        errors).

        """

        branch = self.make_branch('source')

        hook_calls_1 = self.install_logging_hook('pre')

        hook_calls_2 = self.install_logging_hook('pre')

        self.assertIsNot(hook_calls_1, hook_calls_2)

        branch.set_last_revision_info(0, revision.NULL_REVISION)

        # Both hooks are called.

        if isinstance(branch, remote.RemoteBranch):

            count = 2

        else:

            count = 1

        self.assertEqual(len(hook_calls_1), count)

        self.assertEqual(len(hook_calls_2), count)

    def test_explicit_reject_by_hook(self):

        """If a hook raises TipChangeRejected, the change does not take effect.

        TipChangeRejected exceptions are propagated, not wrapped in HookFailed.

        """

        branch = self.make_branch_with_revision_ids(

            'one-\xc2\xb5', 'two-\xc2\xb5')

        def hook_that_rejects(params):

            raise errors.TipChangeRejected('rejection message')

        _mod_branch.Branch.hooks.install_named_hook(

            'pre_change_branch_tip', hook_that_rejects, None)

        self.assertRaises(

            errors.TipChangeRejected,

            branch.set_last_revision_info, 0, revision.NULL_REVISION)

        # The revision info is unchanged.

        self.assertEqual((2, 'two-\xc2\xb5'), branch.last_revision_info())

class TestPostChangeBranchTip(ChangeBranchTipTestCase):

    """Tests for post_change_branch_tip hook.

    Most of these tests are very similar to the tests in

    TestPostChangeBranchTip.

    """

    def test_hook_runs_after_change(self):

        """The hook runs *after* the branch's last_revision_info has changed.

        """

        branch = self.make_branch_with_revision_ids('revid-one')

        def assertBranchAtRevision1(params):

            self.assertEquals(

                (0, revision.NULL_REVISION), params.branch.last_revision_info())

        _mod_branch.Branch.hooks.install_named_hook(

            'post_change_branch_tip', assertBranchAtRevision1, None)

        branch.set_last_revision_info(0, revision.NULL_REVISION)

    def test_empty_history(self):

        branch = self.make_branch('source')

        hook_calls = self.install_logging_hook('post')

        branch.set_last_revision_info(0, revision.NULL_REVISION)

        expected_params = _mod_branch.ChangeBranchTipParams(

            branch, 0, 0, revision.NULL_REVISION, revision.NULL_REVISION)

        self.assertHookCalls(expected_params, branch, hook_calls)

    def test_nonempty_history(self):

        # some branches require that their history be set to a revision in the

        # repository, so we need to make a branch with non-empty history for

        # this test.

        branch = self.make_branch_with_revision_ids(

            'one-\xc2\xb5', 'two-\xc2\xb5')

        hook_calls = self.install_logging_hook('post')

        branch.set_last_revision_info(1, 'one-\xc2\xb5')

        expected_params = _mod_branch.ChangeBranchTipParams(

            branch, 2, 1, 'two-\xc2\xb5', 'one-\xc2\xb5')

        self.assertHookCalls(expected_params, branch, hook_calls)

    def test_branch_is_locked(self):

        """The branch passed to the hook is locked."""

        branch = self.make_branch('source')

        def assertBranchIsLocked(params):

            self.assertTrue(params.branch.is_locked())

        _mod_branch.Branch.hooks.install_named_hook(

            'post_change_branch_tip', assertBranchIsLocked, None)

        branch.set_last_revision_info(0, revision.NULL_REVISION)

    def test_calls_all_hooks_no_errors(self):

        """If multiple hooks are registered, all are called (if none raise

        errors).

        """

        branch = self.make_branch('source')

        hook_calls_1 = self.install_logging_hook('post')

        hook_calls_2 = self.install_logging_hook('post')

        self.assertIsNot(hook_calls_1, hook_calls_2)

        branch.set_last_revision_info(0, revision.NULL_REVISION)

        # Both hooks are called.

        if isinstance(branch, remote.RemoteBranch):

            count = 2

        else:

            count = 1

        self.assertEqual(len(hook_calls_1), count)

        self.assertEqual(len(hook_calls_2), count)

class TestAllMethodsThatChangeTipWillRunHooks(ChangeBranchTipTestCase):

    """Every method of Branch that changes a branch tip will invoke the

    pre/post_change_branch_tip hooks.

    """

    def setUp(self):

        super(TestAllMethodsThatChangeTipWillRunHooks, self).setUp()

        self.installPreAndPostHooks()

    def installPreAndPostHooks(self):

        self.pre_hook_calls = self.install_logging_hook('pre')

        self.post_hook_calls = self.install_logging_hook('post')

    def resetHookCalls(self):

        del self.pre_hook_calls[:], self.post_hook_calls[:]

    def assertPreAndPostHooksWereInvoked(self, branch, smart_enabled):

        """assert that both pre and post hooks were called

        :param smart_enabled: The method invoked is one that should be

            smart server ready.

        """

        # Check for the number of invocations expected. One invocation is

        # local, one is remote (if the branch is remote).

        if smart_enabled and isinstance(branch, remote.RemoteBranch):

            length = 2

        else:

            length = 1

        self.assertEqual(length, len(self.pre_hook_calls))

        self.assertEqual(length, len(self.post_hook_calls))

    def test_set_last_revision_info(self):

        branch = self.make_branch('')

        branch.set_last_revision_info(0, revision.NULL_REVISION)

        self.assertPreAndPostHooksWereInvoked(branch, True)

    def test_generate_revision_history(self):

        branch = self.make_branch('')

        branch.generate_revision_history(revision.NULL_REVISION)

        # NB: for HPSS protocols < v3, the server does not invoke branch tip

        # change events on generate_revision_history, as the change is done

        # directly by the client over the VFS.

        self.assertPreAndPostHooksWereInvoked(branch, True)

    def test_pull(self):

        source_branch = self.make_branch_with_revision_ids('rev-1', 'rev-2')

        self.resetHookCalls()

        destination_branch = self.make_branch('destination')

        destination_branch.pull(source_branch)

        self.assertPreAndPostHooksWereInvoked(destination_branch, False)

    def test_push(self):

        source_branch = self.make_branch_with_revision_ids('rev-1', 'rev-2')

        self.resetHookCalls()

        destination_branch = self.make_branch('destination')

        source_branch.push(destination_branch)

        self.assertPreAndPostHooksWereInvoked(destination_branch, True)