~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2006, 2008-2011 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

"""Tests for the Registry classes"""

import os

import sys

from bzrlib import (

    branch,

    osutils,

    registry,

    tests,

    )

class TestRegistry(tests.TestCase):

    def register_stuff(self, a_registry):

        a_registry.register('one', 1)

        a_registry.register('two', 2)

        a_registry.register('four', 4)

        a_registry.register('five', 5)

    def test_registry(self):

        a_registry = registry.Registry()

        self.register_stuff(a_registry)

        self.failUnless(a_registry.default_key is None)

        # test get() (self.default_key is None)

        self.assertRaises(KeyError, a_registry.get)

        self.assertRaises(KeyError, a_registry.get, None)

        self.assertEqual(2, a_registry.get('two'))

        self.assertRaises(KeyError, a_registry.get, 'three')

        # test _set_default_key

        a_registry.default_key = 'five'

        self.failUnless(a_registry.default_key == 'five')

        self.assertEqual(5, a_registry.get())

        self.assertEqual(5, a_registry.get(None))

        # If they ask for a specific entry, they should get KeyError

        # not the default value. They can always pass None if they prefer

        self.assertRaises(KeyError, a_registry.get, 'six')

        self.assertRaises(KeyError, a_registry._set_default_key, 'six')

        # test keys()

        self.assertEqual(['five', 'four', 'one', 'two'], a_registry.keys())

    def test_registry_funcs(self):

        a_registry = registry.Registry()

        self.register_stuff(a_registry)

        self.failUnless('one' in a_registry)

        a_registry.remove('one')

        self.failIf('one' in a_registry)

        self.assertRaises(KeyError, a_registry.get, 'one')

        a_registry.register('one', 'one')

        self.assertEqual(['five', 'four', 'one', 'two'],

                         sorted(a_registry.keys()))

        self.assertEqual([('five', 5), ('four', 4),

                          ('one', 'one'), ('two', 2)],

                         sorted(a_registry.iteritems()))

    def test_register_override(self):

        a_registry = registry.Registry()

        a_registry.register('one', 'one')

        self.assertRaises(KeyError, a_registry.register, 'one', 'two')

        self.assertRaises(KeyError, a_registry.register, 'one', 'two',

                                    override_existing=False)

        a_registry.register('one', 'two', override_existing=True)

        self.assertEqual('two', a_registry.get('one'))

        self.assertRaises(KeyError, a_registry.register_lazy,

                          'one', 'three', 'four')

        a_registry.register_lazy('one', 'module', 'member',

                                 override_existing=True)

    def test_registry_help(self):

        a_registry = registry.Registry()

        a_registry.register('one', 1, help='help text for one')

        # We should not have to import the module to return the help

        # information

        a_registry.register_lazy('two', 'nonexistent_module', 'member',

                                 help='help text for two')

        # We should be able to handle a callable to get information

        help_calls = []

        def generic_help(reg, key):

            help_calls.append(key)

            return 'generic help for %s' % (key,)

        a_registry.register('three', 3, help=generic_help)

        a_registry.register_lazy('four', 'nonexistent_module', 'member2',

                                 help=generic_help)

        a_registry.register('five', 5)

        def help_from_object(reg, key):

            obj = reg.get(key)

            return obj.help()

        class SimpleObj(object):

            def help(self):

                return 'this is my help'

        a_registry.register('six', SimpleObj(), help=help_from_object)

        self.assertEqual('help text for one', a_registry.get_help('one'))

        self.assertEqual('help text for two', a_registry.get_help('two'))

        self.assertEqual('generic help for three',

                         a_registry.get_help('three'))

        self.assertEqual(['three'], help_calls)

        self.assertEqual('generic help for four',

                         a_registry.get_help('four'))

        self.assertEqual(['three', 'four'], help_calls)

        self.assertEqual(None, a_registry.get_help('five'))

        self.assertEqual('this is my help', a_registry.get_help('six'))

        self.assertRaises(KeyError, a_registry.get_help, None)

        self.assertRaises(KeyError, a_registry.get_help, 'seven')

        a_registry.default_key = 'one'

        self.assertEqual('help text for one', a_registry.get_help(None))

        self.assertRaises(KeyError, a_registry.get_help, 'seven')

        self.assertEqual([('five', None),

                          ('four', 'generic help for four'),

                          ('one', 'help text for one'),

                          ('six', 'this is my help'),

                          ('three', 'generic help for three'),

                          ('two', 'help text for two'),

                         ], sorted((key, a_registry.get_help(key))

                                    for key in a_registry.keys()))

        # We don't know what order it was called in, but we should get

        # 2 more calls to three and four

        self.assertEqual(['four', 'four', 'three', 'three'],

                         sorted(help_calls))

    def test_registry_info(self):

        a_registry = registry.Registry()

        a_registry.register('one', 1, info='string info')

        # We should not have to import the module to return the info

        a_registry.register_lazy('two', 'nonexistent_module', 'member',

                                 info=2)

        # We should be able to handle a callable to get information

        a_registry.register('three', 3, info=['a', 'list'])

        obj = object()

        a_registry.register_lazy('four', 'nonexistent_module', 'member2',

                                 info=obj)

        a_registry.register('five', 5)

        self.assertEqual('string info', a_registry.get_info('one'))

        self.assertEqual(2, a_registry.get_info('two'))

        self.assertEqual(['a', 'list'], a_registry.get_info('three'))

        self.assertIs(obj, a_registry.get_info('four'))

        self.assertIs(None, a_registry.get_info('five'))

        self.assertRaises(KeyError, a_registry.get_info, None)

        self.assertRaises(KeyError, a_registry.get_info, 'six')

        a_registry.default_key = 'one'

        self.assertEqual('string info', a_registry.get_info(None))

        self.assertRaises(KeyError, a_registry.get_info, 'six')

        self.assertEqual([('five', None),

                          ('four', obj),

                          ('one', 'string info'),

                          ('three', ['a', 'list']),

                          ('two', 2),

                         ], sorted((key, a_registry.get_info(key))

                                    for key in a_registry.keys()))

    def test_get_prefix(self):

        my_registry = registry.Registry()

        http_object = object()

        sftp_object = object()

        my_registry.register('http:', http_object)

        my_registry.register('sftp:', sftp_object)

        found_object, suffix = my_registry.get_prefix('http://foo/bar')

        self.assertEqual('//foo/bar', suffix)

        self.assertIs(http_object, found_object)

        self.assertIsNot(sftp_object, found_object)

        found_object, suffix = my_registry.get_prefix('sftp://baz/qux')

        self.assertEqual('//baz/qux', suffix)

        self.assertIs(sftp_object, found_object)

class TestRegistryIter(tests.TestCase):

    """Test registry iteration behaviors.

    There are dark corner cases here when the registered objects trigger

    addition in the iterated registry.

    """

    def setUp(self):

        super(TestRegistryIter, self).setUp()

        # We create a registry with "official" objects and "hidden"

        # objects. The later represent the side effects that led to bug #277048

        # and #430510

        self.registry =  registry.Registry()

        def register_more():

            self.registry.register('hidden', None)

        self.registry.register('passive', None)

        self.registry.register('active', register_more)

        self.registry.register('passive-too', None)

        class InvasiveGetter(registry._ObjectGetter):

            def get_obj(inner_self):

                # Surprise ! Getting a registered object (think lazy loaded

                # module) register yet another object !

                self.registry.register('more hidden', None)

                return inner_self._obj

        self.registry.register('hacky', None)

        # We peek under the covers because the alternative is to use lazy

        # registration and create a module that can reference our test registry

        # it's too much work for such a corner case -- vila 090916

        self.registry._dict['hacky'] = InvasiveGetter(None)

    def _iter_them(self, iter_func_name):

        iter_func = getattr(self.registry, iter_func_name, None)

        self.assertIsNot(None, iter_func)

        count = 0

        for name, func in iter_func():

            count += 1

            self.assertFalse(name in ('hidden', 'more hidden'))

            if func is not None:

                # Using an object register another one as a side effect

                func()

        self.assertEqual(4, count)

    def test_iteritems(self):

        # the dict is modified during the iteration

        self.assertRaises(RuntimeError, self._iter_them, 'iteritems')

    def test_items(self):

        # we should be able to iterate even if one item modify the dict

        self._iter_them('items')

class TestRegistryWithDirs(tests.TestCaseInTempDir):

    """Registry tests that require temporary dirs"""

    def create_plugin_file(self, contents):

        """Create a file to be used as a plugin.

        This is created in a temporary directory, so that we

        are sure that it doesn't start in the plugin path.

        """

        os.mkdir('tmp')

        plugin_name = 'bzr_plugin_a_%s' % (osutils.rand_chars(4),)

        open('tmp/'+plugin_name+'.py', 'wb').write(contents)

        return plugin_name

    def create_simple_plugin(self):

        return self.create_plugin_file(

            'object1 = "foo"\n'

            '\n\n'

            'def function(a,b,c):\n'

            '    return a,b,c\n'

            '\n\n'

            'class MyClass(object):\n'

            '    def __init__(self, a):\n'

            '      self.a = a\n'

            '\n\n'

        )

    def test_lazy_import_registry_foo(self):

        a_registry = registry.Registry()

        a_registry.register_lazy('foo', 'bzrlib.branch', 'Branch')

        a_registry.register_lazy('bar', 'bzrlib.branch', 'Branch.hooks')

        self.assertEqual(branch.Branch, a_registry.get('foo'))

        self.assertEqual(branch.Branch.hooks, a_registry.get('bar'))

    def test_lazy_import_registry(self):

        plugin_name = self.create_simple_plugin()

        a_registry = registry.Registry()

        a_registry.register_lazy('obj', plugin_name, 'object1')

        a_registry.register_lazy('function', plugin_name, 'function')

        a_registry.register_lazy('klass', plugin_name, 'MyClass')

        a_registry.register_lazy('module', plugin_name, None)

        self.assertEqual(['function', 'klass', 'module', 'obj'],

                         sorted(a_registry.keys()))

        # The plugin should not be loaded until we grab the first object

        self.failIf(plugin_name in sys.modules)

        # By default the plugin won't be in the search path

        self.assertRaises(ImportError, a_registry.get, 'obj')

        plugin_path = os.getcwd() + '/tmp'

        sys.path.append(plugin_path)

        try:

            obj = a_registry.get('obj')

            self.assertEqual('foo', obj)

            self.failUnless(plugin_name in sys.modules)

            # Now grab another object

            func = a_registry.get('function')

            self.assertEqual(plugin_name, func.__module__)

            self.assertEqual('function', func.__name__)

            self.assertEqual((1, [], '3'), func(1, [], '3'))

            # And finally a class

            klass = a_registry.get('klass')

            self.assertEqual(plugin_name, klass.__module__)

            self.assertEqual('MyClass', klass.__name__)

            inst = klass(1)

            self.assertIsInstance(inst, klass)

            self.assertEqual(1, inst.a)

            module = a_registry.get('module')

            self.assertIs(obj, module.object1)

            self.assertIs(func, module.function)

            self.assertIs(klass, module.MyClass)

        finally:

            sys.path.remove(plugin_path)