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  • Committer: teddy at recompile
  • Date: 2020-01-12 01:42:09 UTC
  • Revision ID: teddy@recompile.se-20200112014209-ktr3acloxzbmhbnt
mandos-ctl: Add DBussy support

Add support in mandos-ctl for the "DBussy" Python D-Bus module.  Use
it by default, if it is available.

* mandos-ctl: Try to import the "dbussy" and its high-level module
  "ravel".
  (main): Use DBussy if import succeeded.
  (dbussy_adapter): New.
  (Test_dbussy_adapter_SystemBus): New test class.

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Lines of Context:
mandos-ctl
50
50
    __metaclass__ = type
51
51
    str = unicode
52
52
 
 
53
class gi:
 
54
    """Dummy gi module, for the tests"""
 
55
    class repository:
 
56
        class GLib:
 
57
            class Error(Exception):
 
58
                pass
 
59
dbussy = None
 
60
ravel = None
 
61
dbus_python = None
 
62
pydbus = None
 
63
 
53
64
try:
54
 
    import pydbus
55
 
    import gi
56
 
    dbus_python = None
 
65
    import dbussy
 
66
    import ravel
57
67
except ImportError:
58
 
    import dbus as dbus_python
59
 
    pydbus = None
60
 
    class gi:
61
 
        """Dummy gi module, for the tests"""
62
 
        class repository:
63
 
            class GLib:
64
 
                class Error(Exception):
65
 
                    pass
 
68
    try:
 
69
        import pydbus
 
70
        import gi
 
71
    except ImportError:
 
72
        import dbus as dbus_python
 
73
 
66
74
 
67
75
# Show warnings by default
68
76
if not sys.warnoptions:
96
104
    if options.debug:
97
105
        log.setLevel(logging.DEBUG)
98
106
 
99
 
    if pydbus is not None:
 
107
    if dbussy is not None and ravel is not None:
 
108
        bus = dbussy_adapter.CachingBus(dbussy, ravel)
 
109
    elif pydbus is not None:
100
110
        bus = pydbus_adapter.CachingBus(pydbus)
101
111
    else:
102
112
        bus = dbus_python_adapter.CachingBus(dbus_python)
487
497
                             self.properties_iface, interface, key,
488
498
                             value)
489
499
 
490
 
 
491
500
    class MandosBus(SystemBus):
492
501
        busname_domain = "se.recompile"
493
502
        busname = busname_domain + ".Mandos"
682
691
                return new_object
683
692
 
684
693
 
 
694
class dbussy_adapter:
 
695
    class SystemBus(dbus.SystemBus):
 
696
        """Use DBussy"""
 
697
 
 
698
        def __init__(self, dbussy, ravel):
 
699
            self.dbussy = dbussy
 
700
            self.ravel = ravel
 
701
            self.bus = ravel.system_bus()
 
702
 
 
703
        @contextlib.contextmanager
 
704
        def convert_exception(self, exception_class=dbus.Error):
 
705
            try:
 
706
                yield
 
707
            except self.dbussy.DBusError as e:
 
708
                # This does what "raise from" would do
 
709
                exc = exception_class(*e.args)
 
710
                exc.__cause__ = e
 
711
                raise exc
 
712
 
 
713
        def call_method(self, methodname, busname, objectpath,
 
714
                        interface, *args):
 
715
            proxy_object = self.get_object(busname, objectpath)
 
716
            log.debug("D-Bus: %s:%s:%s.%s(%s)", busname, objectpath,
 
717
                      interface, methodname,
 
718
                      ", ".join(repr(a) for a in args))
 
719
            iface = proxy_object.get_interface(interface)
 
720
            method = getattr(iface, methodname)
 
721
            with self.convert_exception(dbus.Error):
 
722
                value =  method(*args)
 
723
            # DBussy returns values either as an empty list or as a
 
724
            # tuple: (signature, value)
 
725
            if value:
 
726
                return self.type_filter(value[0])
 
727
 
 
728
        def get_object(self, busname, objectpath):
 
729
            log.debug("D-Bus: Connect to: (busname=%r, path=%r)",
 
730
                      busname, objectpath)
 
731
            with self.convert_exception(dbus.ConnectFailed):
 
732
                return self.bus[busname][objectpath]
 
733
 
 
734
        def type_filter(self, value):
 
735
            """Convert the most bothersome types to Python types"""
 
736
            if isinstance(value, tuple):
 
737
                if (len(value) == 2
 
738
                    and isinstance(value[0],
 
739
                                   self.dbussy.DBUS.Signature)):
 
740
                    return self.type_filter(value[1])
 
741
            elif isinstance(value, self.dbussy.DBUS.ObjectPath):
 
742
                return str(value)
 
743
            # Also recurse into dictionaries
 
744
            elif isinstance(value, dict):
 
745
                return {self.type_filter(key):
 
746
                        self.type_filter(subval)
 
747
                        for key, subval in value.items()}
 
748
            return value
 
749
 
 
750
        def set_property(self, busname, objectpath, interface, key,
 
751
                         value):
 
752
            proxy_object = self.get_object(busname, objectpath)
 
753
            log.debug("D-Bus: %s:%s:%s.Set(%r, %r, %r)", busname,
 
754
                      objectpath, self.properties_iface, interface,
 
755
                      key, value)
 
756
            if key == "Secret":
 
757
                # DBussy wants a Byte Array to be a sequence of
 
758
                # values, not a byte string
 
759
                value = tuple(value)
 
760
            setattr(proxy_object.get_interface(interface), key, value)
 
761
 
 
762
    class MandosBus(SystemBus, dbus.MandosBus):
 
763
        pass
 
764
 
 
765
    class CachingBus(MandosBus):
 
766
        """A caching layer for dbussy_adapter.MandosBus"""
 
767
        def __init__(self, *args, **kwargs):
 
768
            self.object_cache = {}
 
769
            super(dbussy_adapter.CachingBus, self).__init__(*args,
 
770
                                                            **kwargs)
 
771
        def get_object(self, busname, objectpath):
 
772
            try:
 
773
                return self.object_cache[(busname, objectpath)]
 
774
            except KeyError:
 
775
                new_object = super(
 
776
                    dbussy_adapter.CachingBus,
 
777
                    self).get_object(busname, objectpath)
 
778
                self.object_cache[(busname, objectpath)]  = new_object
 
779
                return new_object
 
780
 
 
781
 
685
782
def commands_from_options(options):
686
783
 
687
784
    commands = list(options.commands)
1774
1871
        self.assertIs(obj1, obj1b)
1775
1872
 
1776
1873
 
 
1874
class Test_dbussy_adapter_SystemBus(TestCaseWithAssertLogs):
 
1875
 
 
1876
    class dummy_dbussy:
 
1877
        class DBUS:
 
1878
            class ObjectPath(str):
 
1879
                pass
 
1880
        class DBusError(Exception):
 
1881
            pass
 
1882
 
 
1883
    def fake_ravel_func(self, func):
 
1884
        class fake_ravel:
 
1885
            @staticmethod
 
1886
            def system_bus():
 
1887
                class DBusInterfaceProxy:
 
1888
                    @staticmethod
 
1889
                    def methodname(*args):
 
1890
                        return [func(*args)]
 
1891
                class DBusObject:
 
1892
                    @staticmethod
 
1893
                    def get_interface(interface):
 
1894
                        if interface == "interface":
 
1895
                            return DBusInterfaceProxy()
 
1896
                return {"busname": {"objectpath": DBusObject()}}
 
1897
        return fake_ravel
 
1898
 
 
1899
    def call_method(self, bus, methodname, busname, objectpath,
 
1900
                    interface, *args):
 
1901
        with self.assertLogs(log, logging.DEBUG):
 
1902
            return bus.call_method(methodname, busname, objectpath,
 
1903
                                   interface, *args)
 
1904
 
 
1905
    def test_call_method_returns(self):
 
1906
        expected_method_return = Unique()
 
1907
        method_args = (Unique(), Unique())
 
1908
        def func(*args):
 
1909
            self.assertEqual(len(method_args), len(args))
 
1910
            for marg, arg in zip(method_args, args):
 
1911
                self.assertIs(marg, arg)
 
1912
            return expected_method_return
 
1913
        fake_ravel = self.fake_ravel_func(func)
 
1914
        bus = dbussy_adapter.SystemBus(self.dummy_dbussy, fake_ravel)
 
1915
        ret = self.call_method(bus, "methodname", "busname",
 
1916
                               "objectpath", "interface",
 
1917
                               *method_args)
 
1918
        self.assertIs(ret, expected_method_return)
 
1919
 
 
1920
    def test_call_method_filters_objectpath(self):
 
1921
        def func():
 
1922
            return method_return
 
1923
        fake_ravel = self.fake_ravel_func(func)
 
1924
        bus = dbussy_adapter.SystemBus(self.dummy_dbussy, fake_ravel)
 
1925
        method_return = (self.dummy_dbussy.DBUS
 
1926
                         .ObjectPath("objectpath"))
 
1927
        ret = self.call_method(bus, "methodname", "busname",
 
1928
                               "objectpath", "interface")
 
1929
        self.assertEqual("objectpath", ret)
 
1930
        self.assertNotIsInstance(ret,
 
1931
                                 self.dummy_dbussy.DBUS.ObjectPath)
 
1932
 
 
1933
    def test_call_method_filters_objectpaths_in_dict(self):
 
1934
        ObjectPath = self.dummy_dbussy.DBUS.ObjectPath
 
1935
        def func():
 
1936
            return method_return
 
1937
        fake_ravel = self.fake_ravel_func(func)
 
1938
        bus = dbussy_adapter.SystemBus(self.dummy_dbussy, fake_ravel)
 
1939
        method_return = {
 
1940
            ObjectPath("objectpath_key_1"):
 
1941
            ObjectPath("objectpath_value_1"),
 
1942
            ObjectPath("objectpath_key_2"):
 
1943
            ObjectPath("objectpath_value_2"),
 
1944
        }
 
1945
        ret = self.call_method(bus, "methodname", "busname",
 
1946
                               "objectpath", "interface")
 
1947
        expected_method_return = {str(key): str(value)
 
1948
                                  for key, value in
 
1949
                                  method_return.items()}
 
1950
        for key, value in ret.items():
 
1951
            self.assertNotIsInstance(key, ObjectPath)
 
1952
            self.assertNotIsInstance(value, ObjectPath)
 
1953
        self.assertEqual(expected_method_return, ret)
 
1954
        self.assertIsInstance(ret, dict)
 
1955
 
 
1956
    def test_call_method_filters_objectpaths_in_dict_in_dict(self):
 
1957
        ObjectPath = self.dummy_dbussy.DBUS.ObjectPath
 
1958
        def func():
 
1959
            return method_return
 
1960
        fake_ravel = self.fake_ravel_func(func)
 
1961
        bus = dbussy_adapter.SystemBus(self.dummy_dbussy, fake_ravel)
 
1962
        method_return = {
 
1963
            ObjectPath("key1"): {
 
1964
                ObjectPath("key11"): ObjectPath("value11"),
 
1965
                ObjectPath("key12"): ObjectPath("value12"),
 
1966
            },
 
1967
            ObjectPath("key2"): {
 
1968
                ObjectPath("key21"): ObjectPath("value21"),
 
1969
                ObjectPath("key22"): ObjectPath("value22"),
 
1970
            },
 
1971
        }
 
1972
        ret = self.call_method(bus, "methodname", "busname",
 
1973
                               "objectpath", "interface")
 
1974
        expected_method_return = {
 
1975
            "key1": {"key11": "value11",
 
1976
                     "key12": "value12"},
 
1977
            "key2": {"key21": "value21",
 
1978
                     "key22": "value22"},
 
1979
        }
 
1980
        self.assertEqual(expected_method_return, ret)
 
1981
        for key, value in ret.items():
 
1982
            self.assertIsInstance(value, dict)
 
1983
            self.assertEqual(expected_method_return[key], value)
 
1984
            self.assertNotIsInstance(key, ObjectPath)
 
1985
            for inner_key, inner_value in value.items():
 
1986
                self.assertIsInstance(value, dict)
 
1987
                self.assertEqual(
 
1988
                    expected_method_return[key][inner_key],
 
1989
                    inner_value)
 
1990
                self.assertNotIsInstance(key, ObjectPath)
 
1991
 
 
1992
    def test_call_method_filters_objectpaths_in_dict_three_deep(self):
 
1993
        ObjectPath = self.dummy_dbussy.DBUS.ObjectPath
 
1994
        def func():
 
1995
            return method_return
 
1996
        fake_ravel = self.fake_ravel_func(func)
 
1997
        bus = dbussy_adapter.SystemBus(self.dummy_dbussy, fake_ravel)
 
1998
        method_return = {
 
1999
            ObjectPath("key1"): {
 
2000
                ObjectPath("key2"): {
 
2001
                    ObjectPath("key3"): ObjectPath("value"),
 
2002
                },
 
2003
            },
 
2004
        }
 
2005
        ret = self.call_method(bus, "methodname", "busname",
 
2006
                               "objectpath", "interface")
 
2007
        expected_method_return = {"key1": {"key2": {"key3": "value"}}}
 
2008
        self.assertEqual(expected_method_return, ret)
 
2009
        self.assertIsInstance(ret, dict)
 
2010
        self.assertNotIsInstance(next(iter(ret.keys())), ObjectPath)
 
2011
        self.assertIsInstance(ret["key1"], dict)
 
2012
        self.assertNotIsInstance(next(iter(ret["key1"].keys())),
 
2013
                                 ObjectPath)
 
2014
        self.assertIsInstance(ret["key1"]["key2"], dict)
 
2015
        self.assertNotIsInstance(
 
2016
            next(iter(ret["key1"]["key2"].keys())),
 
2017
            ObjectPath)
 
2018
        self.assertEqual("value", ret["key1"]["key2"]["key3"])
 
2019
        self.assertNotIsInstance(ret["key1"]["key2"]["key3"],
 
2020
                                 self.dummy_dbussy.DBUS.ObjectPath)
 
2021
 
 
2022
    def test_call_method_handles_exception(self):
 
2023
        def func():
 
2024
            raise self.dummy_dbussy.DBusError()
 
2025
 
 
2026
        fake_ravel = self.fake_ravel_func(func)
 
2027
        bus = dbussy_adapter.SystemBus(self.dummy_dbussy, fake_ravel)
 
2028
 
 
2029
        with self.assertRaises(dbus.Error) as e:
 
2030
            self.call_method(bus, "methodname", "busname",
 
2031
                             "objectpath", "interface")
 
2032
 
 
2033
        self.assertNotIsInstance(e.exception, dbus.ConnectFailed)
 
2034
 
 
2035
    def test_get_object_converts_to_correct_exception(self):
 
2036
        class fake_ravel_raises_exception_on_connect:
 
2037
            @staticmethod
 
2038
            def system_bus():
 
2039
                class Bus:
 
2040
                    @staticmethod
 
2041
                    def __getitem__(key):
 
2042
                        if key == "objectpath":
 
2043
                            raise self.dummy_dbussy.DBusError()
 
2044
                        raise Exception(key)
 
2045
                return {"busname": Bus()}
 
2046
        def func():
 
2047
            raise self.dummy_dbussy.DBusError()
 
2048
        bus = dbussy_adapter.SystemBus(
 
2049
            self.dummy_dbussy,
 
2050
            fake_ravel_raises_exception_on_connect)
 
2051
        with self.assertRaises(dbus.ConnectFailed):
 
2052
            self.call_method(bus, "methodname", "busname",
 
2053
                             "objectpath", "interface")
 
2054
 
 
2055
 
1777
2056
class Test_commands_from_options(unittest.TestCase):
1778
2057
 
1779
2058
    def setUp(self):