freeipa/ipatests/test_ipalib/test_plugable.py

# Authors:
#   Jason Gerard DeRose <jderose@redhat.com>
#
# Copyright (C) 2008  Red Hat
# see file 'COPYING' for use and warranty information
#
# 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 3 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, see <http://www.gnu.org/licenses/>.

"""
Test the `ipalib.plugable` module.
"""

# FIXME: Pylint errors
# pylint: disable=no-member

import inspect
from ipatests.util import raises, no_set, no_del, read_only
from ipatests.util import getitem, setitem, delitem
from ipatests.util import ClassChecker, create_test_api
from ipalib import plugable, errors, text
from ipaplatform.paths import paths


class test_SetProxy(ClassChecker):
    """
    Test the `ipalib.plugable.SetProxy` class.
    """
    _cls = plugable.SetProxy

    def test_class(self):
        """
        Test the `ipalib.plugable.SetProxy` class.
        """
        assert self.cls.__bases__ == (plugable.ReadOnly,)

    def test_init(self):
        """
        Test the `ipalib.plugable.SetProxy.__init__` method.
        """
        okay = (set, frozenset, dict)
        fail = (list, tuple)
        for t in okay:
            self.cls(t())
            raises(TypeError, self.cls, t)
        for t in fail:
            raises(TypeError, self.cls, t())
            raises(TypeError, self.cls, t)

    def test_SetProxy(self):
        """
        Test container emulation of `ipalib.plugable.SetProxy` class.
        """
        def get_key(i):
            return 'key_%d' % i

        cnt = 10
        target = set()
        proxy = self.cls(target)
        for i in xrange(cnt):
            key = get_key(i)

            # Check initial state
            assert len(proxy) == len(target)
            assert list(proxy) == sorted(target)
            assert key not in proxy
            assert key not in target

            # Add and test again
            target.add(key)
            assert len(proxy) == len(target)
            assert list(proxy) == sorted(target)
            assert key in proxy
            assert key in target


class test_DictProxy(ClassChecker):
    """
    Test the `ipalib.plugable.DictProxy` class.
    """
    _cls = plugable.DictProxy

    def test_class(self):
        """
        Test the `ipalib.plugable.DictProxy` class.
        """
        assert self.cls.__bases__ == (plugable.SetProxy,)

    def test_init(self):
        """
        Test the `ipalib.plugable.DictProxy.__init__` method.
        """
        self.cls(dict())
        raises(TypeError, self.cls, dict)
        fail = (set, frozenset, list, tuple)
        for t in fail:
            raises(TypeError, self.cls, t())
            raises(TypeError, self.cls, t)

    def test_DictProxy(self):
        """
        Test container emulation of `ipalib.plugable.DictProxy` class.
        """
        def get_kv(i):
            return (
                'key_%d' % i,
                'val_%d' % i,
            )
        cnt = 10
        target = dict()
        proxy = self.cls(target)
        for i in xrange(cnt):
            (key, val) = get_kv(i)

            # Check initial state
            assert len(proxy) == len(target)
            assert list(proxy) == sorted(target)
            assert list(proxy()) == [target[k] for k in sorted(target)]
            assert key not in proxy
            raises(KeyError, getitem, proxy, key)

            # Add and test again
            target[key] = val
            assert len(proxy) == len(target)
            assert list(proxy) == sorted(target)
            assert list(proxy()) == [target[k] for k in sorted(target)]

            # Verify TypeError is raised trying to set/del via proxy
            raises(TypeError, setitem, proxy, key, val)
            raises(TypeError, delitem, proxy, key)


class test_MagicDict(ClassChecker):
    """
    Test the `ipalib.plugable.MagicDict` class.
    """
    _cls = plugable.MagicDict

    def test_class(self):
        """
        Test the `ipalib.plugable.MagicDict` class.
        """
        assert self.cls.__bases__ == (plugable.DictProxy,)
        for non_dict in ('hello', 69, object):
            raises(TypeError, self.cls, non_dict)

    def test_MagicDict(self):
        """
        Test container emulation of `ipalib.plugable.MagicDict` class.
        """
        cnt = 10
        keys = []
        d = dict()
        dictproxy = self.cls(d)
        for i in xrange(cnt):
            key = 'key_%d' % i
            val = 'val_%d' % i
            keys.append(key)

            # Test thet key does not yet exist
            assert len(dictproxy) == i
            assert key not in dictproxy
            assert not hasattr(dictproxy, key)
            raises(KeyError, getitem, dictproxy, key)
            raises(AttributeError, getattr, dictproxy, key)

            # Test that items/attributes cannot be set on dictproxy:
            raises(TypeError, setitem, dictproxy, key, val)
            raises(AttributeError, setattr, dictproxy, key, val)

            # Test that additions in d are reflected in dictproxy:
            d[key] = val
            assert len(dictproxy) == i + 1
            assert key in dictproxy
            assert hasattr(dictproxy, key)
            assert dictproxy[key] is val
            assert read_only(dictproxy, key) is val

        # Test __iter__
        assert list(dictproxy) == keys

        for key in keys:
            # Test that items cannot be deleted through dictproxy:
            raises(TypeError, delitem, dictproxy, key)
            raises(AttributeError, delattr, dictproxy, key)

            # Test that deletions in d are reflected in dictproxy
            del d[key]
            assert len(dictproxy) == len(d)
            assert key not in dictproxy
            raises(KeyError, getitem, dictproxy, key)
            raises(AttributeError, getattr, dictproxy, key)


class test_Plugin(ClassChecker):
    """
    Test the `ipalib.plugable.Plugin` class.
    """
    _cls = plugable.Plugin

    def test_class(self):
        """
        Test the `ipalib.plugable.Plugin` class.
        """
        assert self.cls.__bases__ == (plugable.ReadOnly,)
        assert type(self.cls.api) is property

    def test_init(self):
        """
        Test the `ipalib.plugable.Plugin.__init__` method.
        """
        o = self.cls()
        assert o.name == 'Plugin'
        assert o.module == 'ipalib.plugable'
        assert o.fullname == 'ipalib.plugable.Plugin'
        assert isinstance(o.doc, text.Gettext)
        class some_subclass(self.cls):
            """
            Do sub-classy things.

            Although it doesn't know how to comport itself and is not for mixed
            company, this class *is* useful as we all need a little sub-class
            now and then.

            One more paragraph.
            """
        o = some_subclass()
        assert o.name == 'some_subclass'
        assert o.module == __name__
        assert o.fullname == '%s.some_subclass' % __name__
        assert o.summary == 'Do sub-classy things.'
        assert isinstance(o.doc, text.Gettext)
        class another_subclass(self.cls):
            pass
        o = another_subclass()
        assert o.summary == '<%s>' % o.fullname

        # Test that Plugin makes sure the subclass hasn't defined attributes
        # whose names conflict with the logger methods set in Plugin.__init__():
        class check(self.cls):
            info = 'whatever'
        e = raises(StandardError, check)
        assert str(e) == \
            "info is already bound to ipatests.test_ipalib.test_plugable.check()"

    def test_set_api(self):
        """
        Test the `ipalib.plugable.Plugin.set_api` method.
        """
        api = 'the api instance'
        o = self.cls()
        assert o.api is None
        e = raises(AssertionError, o.set_api, None)
        assert str(e) == 'set_api() argument cannot be None'
        o.set_api(api)
        assert o.api is api
        e = raises(AssertionError, o.set_api, api)
        assert str(e) == 'set_api() can only be called once'

    def test_finalize(self):
        """
        Test the `ipalib.plugable.Plugin.finalize` method.
        """
        o = self.cls()
        assert not o.__islocked__()
        o.finalize()
        assert o.__islocked__()

    def test_call(self):
        """
        Test the `ipalib.plugable.Plugin.call` method.
        """
        o = self.cls()
        o.call(paths.BIN_TRUE) is None
        e = raises(errors.SubprocessError, o.call, paths.BIN_FALSE)
        assert e.returncode == 1
        assert e.argv == (paths.BIN_FALSE,)


def test_Registrar():
    """
    Test the `ipalib.plugable.Registrar` class
    """
    class Base1(object):
        pass
    class Base2(object):
        pass
    class Base3(object):
        pass
    class plugin1(Base1):
        pass
    class plugin2(Base2):
        pass
    class plugin3(Base3):
        pass

    # Test creation of Registrar:
    r = plugable.Registrar(Base1, Base2)

    # Test __iter__:
    assert list(r) == ['Base1', 'Base2']

    # Test __hasitem__, __getitem__:
    for base in [Base1, Base2]:
        name = base.__name__
        assert name in r
        assert r[name] is base
        magic = getattr(r, name)
        assert type(magic) is plugable.MagicDict
        assert len(magic) == 0

    # Check that TypeError is raised trying to register something that isn't
    # a class:
    p = plugin1()
    e = raises(TypeError, r, p)
    assert str(e) == 'plugin must be a class; got %r' % p

    # Check that SubclassError is raised trying to register a class that is
    # not a subclass of an allowed base:
    e = raises(errors.PluginSubclassError, r, plugin3)
    assert e.plugin is plugin3

    # Check that registration works
    r(plugin1)
    assert len(r.Base1) == 1
    assert r.Base1['plugin1'] is plugin1
    assert r.Base1.plugin1 is plugin1

    # Check that DuplicateError is raised trying to register exact class
    # again:
    e = raises(errors.PluginDuplicateError, r, plugin1)
    assert e.plugin is plugin1

    # Check that OverrideError is raised trying to register class with same
    # name and same base:
    orig1 = plugin1
    class base1_extended(Base1):
        pass
    class plugin1(base1_extended):  # pylint: disable=function-redefined
        pass
    e = raises(errors.PluginOverrideError, r, plugin1)
    assert e.base == 'Base1'
    assert e.name == 'plugin1'
    assert e.plugin is plugin1

    # Check that overriding works
    r(plugin1, override=True)
    assert len(r.Base1) == 1
    assert r.Base1.plugin1 is plugin1
    assert r.Base1.plugin1 is not orig1

    # Check that MissingOverrideError is raised trying to override a name
    # not yet registerd:
    e = raises(errors.PluginMissingOverrideError, r, plugin2, override=True)
    assert e.base == 'Base2'
    assert e.name == 'plugin2'
    assert e.plugin is plugin2

    # Test that another plugin can be registered:
    assert len(r.Base2) == 0
    r(plugin2)
    assert len(r.Base2) == 1
    assert r.Base2.plugin2 is plugin2

    # Setup to test more registration:
    class plugin1a(Base1):
        pass
    r(plugin1a)

    class plugin1b(Base1):
        pass
    r(plugin1b)

    class plugin2a(Base2):
        pass
    r(plugin2a)

    class plugin2b(Base2):
        pass
    r(plugin2b)

    # Again test __hasitem__, __getitem__:
    for base in [Base1, Base2]:
        name = base.__name__
        assert name in r
        assert r[name] is base
        magic = getattr(r, name)
        assert len(magic) == 3
        for key in magic:
            klass = magic[key]
            assert getattr(magic, key) is klass
            assert issubclass(klass, base)


class test_API(ClassChecker):
    """
    Test the `ipalib.plugable.API` class.
    """

    _cls = plugable.API

    def test_API(self):
        """
        Test the `ipalib.plugable.API` class.
        """
        assert issubclass(plugable.API, plugable.ReadOnly)

        # Setup the test bases, create the API:
        class base0(plugable.Plugin):
            def method(self, n):
                return n

        class base1(plugable.Plugin):
            def method(self, n):
                return n + 1

        api = plugable.API(base0, base1)
        api.env.mode = 'unit_test'
        api.env.in_tree = True
        r = api.register
        assert isinstance(r, plugable.Registrar)
        assert read_only(api, 'register') is r

        class base0_plugin0(base0):
            pass
        r(base0_plugin0)

        class base0_plugin1(base0):
            pass
        r(base0_plugin1)

        class base0_plugin2(base0):
            pass
        r(base0_plugin2)

        class base1_plugin0(base1):
            pass
        r(base1_plugin0)

        class base1_plugin1(base1):
            pass
        r(base1_plugin1)

        class base1_plugin2(base1):
            pass
        r(base1_plugin2)

        # Test API instance:
        assert api.isdone('bootstrap') is False
        assert api.isdone('finalize') is False
        api.finalize()
        assert api.isdone('bootstrap') is True
        assert api.isdone('finalize') is True

        def get_base_name(b):
            return 'base%d' % b


        def get_plugin_name(b, p):
            return 'base%d_plugin%d' % (b, p)

        for b in xrange(2):
            base_name = get_base_name(b)
            base = locals()[base_name]
            ns = getattr(api, base_name)
            assert isinstance(ns, plugable.NameSpace)
            assert read_only(api, base_name) is ns
            assert len(ns) == 3
            for p in xrange(3):
                plugin_name = get_plugin_name(b, p)
                plugin = locals()[plugin_name]
                inst = ns[plugin_name]
                assert isinstance(inst, base)
                assert isinstance(inst, plugin)
                assert inst.name == plugin_name
                assert read_only(ns, plugin_name) is inst
                assert inst.method(7) == 7 + b

        # Test that calling finilize again raises AssertionError:
        e = raises(StandardError, api.finalize)
        assert str(e) == 'API.finalize() already called', str(e)

    def test_bootstrap(self):
        """
        Test the `ipalib.plugable.API.bootstrap` method.
        """
        (o, home) = create_test_api()
        assert o.env._isdone('_bootstrap') is False
        assert o.env._isdone('_finalize_core') is False
        assert o.isdone('bootstrap') is False
        o.bootstrap(my_test_override='Hello, world!')
        assert o.isdone('bootstrap') is True
        assert o.env._isdone('_bootstrap') is True
        assert o.env._isdone('_finalize_core') is True
        assert o.env.my_test_override == 'Hello, world!'
        e = raises(StandardError, o.bootstrap)
        assert str(e) == 'API.bootstrap() already called'

    def test_load_plugins(self):
        """
        Test the `ipalib.plugable.API.load_plugins` method.
        """
        (o, home) = create_test_api()
        assert o.isdone('bootstrap') is False
        assert o.isdone('load_plugins') is False
        o.load_plugins()
        assert o.isdone('bootstrap') is True
        assert o.isdone('load_plugins') is True
        e = raises(StandardError, o.load_plugins)
        assert str(e) == 'API.load_plugins() already called'