mirror of
git://sourceware.org/git/lvm2.git
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256 lines
6.6 KiB
Python
256 lines
6.6 KiB
Python
#!/usr/bin/env python3
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# Copyright (C) 2015-2016 Red Hat, Inc. All rights reserved.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions
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# of the GNU General Public License v.2.
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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, see <http://www.gnu.org/licenses/>.
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import string
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import random
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import functools
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import xml.etree.ElementTree as Et
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from collections import OrderedDict
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import dbus
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BUSNAME = "com.redhat.lvmdbus1"
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MANAGER_INT = BUSNAME + '.Manager'
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MANAGER_OBJ = '/' + BUSNAME.replace('.', '/') + '/Manager'
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PV_INT = BUSNAME + ".Pv"
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VG_INT = BUSNAME + ".Vg"
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LV_INT = BUSNAME + ".Lv"
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THINPOOL_INT = BUSNAME + ".ThinPool"
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SNAPSHOT_INT = BUSNAME + ".Snapshot"
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LV_COMMON_INT = BUSNAME + ".LvCommon"
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JOB_INT = BUSNAME + ".Job"
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CACHE_POOL_INT = BUSNAME + ".CachePool"
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CACHE_LV_INT = BUSNAME + ".CachedLv"
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THINPOOL_LV_PATH = '/' + THINPOOL_INT.replace('.', '/')
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def rs(length, suffix, character_set=string.ascii_lowercase):
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return ''.join(random.choice(character_set)
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for _ in range(length)) + suffix
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def mib(s):
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return 1024 * 1024 * s
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class DbusIntrospection(object):
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@staticmethod
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def introspect(xml_representation):
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interfaces = {}
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root = Et.fromstring(xml_representation)
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for c in root:
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if c.tag == "interface":
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in_f = c.attrib['name']
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interfaces[in_f] = \
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dict(methods=OrderedDict(), properties={})
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for nested in c:
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if nested.tag == "method":
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mn = nested.attrib['name']
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interfaces[in_f]['methods'][mn] = OrderedDict()
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for arg in nested:
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if arg.tag == 'arg':
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arg_dir = arg.attrib['direction']
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if arg_dir == 'in':
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n = arg.attrib['name']
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else:
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n = 'RETURN_VALUE'
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arg_type = arg.attrib['type']
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if n:
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v = dict(
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name=mn,
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a_dir=arg_dir,
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a_type=arg_type)
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interfaces[in_f]['methods'][mn][n] = v
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elif nested.tag == 'property':
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pn = nested.attrib['name']
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p_access = nested.attrib['access']
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p_type = nested.attrib['type']
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interfaces[in_f]['properties'][pn] = \
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dict(p_access=p_access, p_type=p_type)
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else:
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pass
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# print('Interfaces...')
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# for k, v in list(interfaces.items()):
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# print('Interface %s' % k)
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# if v['methods']:
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# for m, args in list(v['methods'].items()):
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# print(' method: %s' % m)
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# for a, aa in args.items():
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# print(' method arg: %s type %s' %
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# (a, aa['a_type']))
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# if v['properties']:
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# for p, d in list(v['properties'].items()):
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# print(' Property: %s type= %s' % (p, d['p_type']))
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# print('End interfaces')
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return interfaces
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def btsr(value):
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t = type(value)
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if t == dbus.Boolean:
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return 'b'
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elif t == dbus.ObjectPath:
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return 'o'
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elif t == dbus.String:
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return 's'
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elif t == dbus.Byte:
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return 'y'
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elif t == dbus.Int16:
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return 'n'
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elif t == dbus.Int32:
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return 'i'
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elif t == dbus.Int64:
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return 'x'
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elif t == dbus.UInt16:
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return 'q'
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elif t == dbus.UInt32:
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return 'u'
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elif t == dbus.UInt64:
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return 't'
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elif t == dbus.Double:
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return 'd'
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elif t == dbus.Struct:
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rc = '('
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for vt in value:
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rc += btsr(vt)
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rc += ')'
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return rc
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elif t == dbus.Array:
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rc = "a"
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for i in value:
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rc += btsr(i)
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break
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return rc
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else:
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raise RuntimeError("Unhandled type %s" % str(t))
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def verify_type(value, dbus_str_rep):
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actual_str_rep = btsr(value)
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if dbus_str_rep != actual_str_rep:
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# print("%s ~= %s" % (dbus_str_rep, actual_str_rep))
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# Unless we have a full filled out type we won't match exactly
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if not dbus_str_rep.startswith(actual_str_rep):
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raise RuntimeError("Incorrect type, expected= %s actual "
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"= %s object= %s" %
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(dbus_str_rep, actual_str_rep,
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str(type(value))))
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class RemoteObject(object):
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def _set_props(self, props=None):
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# print 'Fetching properties'
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if not props:
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# prop_fetch = dbus.Interface(self.bus.get_object(
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# BUSNAME, self.object_path), 'org.freedesktop.DBus.Properties')
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for i in range(0, 3):
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try:
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prop_fetch = dbus.Interface(self.bus.get_object(
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BUSNAME, self.object_path),
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'org.freedesktop.DBus.Properties')
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props = prop_fetch.GetAll(self.interface)
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break
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except dbus.exceptions.DBusException as dbe:
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if "GetAll" not in str(dbe):
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raise dbe
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if props:
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for kl, vl in list(props.items()):
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# Verify type is correct!
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verify_type(vl,
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self.introspect[self.interface]['properties'][kl]['p_type'])
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setattr(self, kl, vl)
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def __init__(self, specified_bus, object_path, interface, introspect,
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properties=None):
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self.object_path = object_path
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self.interface = interface
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self.bus = specified_bus
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self.introspect = introspect
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self.dbus_method = dbus.Interface(specified_bus.get_object(
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BUSNAME, self.object_path), self.interface)
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self._set_props(properties)
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def __getattr__(self, item):
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if hasattr(self.dbus_method, item):
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return functools.partial(self._wrapper, item)
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else:
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return functools.partial(self, item)
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def _wrapper(self, _method_name, *args, **kwargs):
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result = getattr(self.dbus_method, _method_name)(*args, **kwargs)
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# print("DEBUG: %s.%s result %s" %
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# (self.interface, _method_name, str(type(result))))
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if 'RETURN_VALUE' in self.introspect[
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self.interface]['methods'][_method_name]:
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r_type = self.introspect[
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self.interface]['methods'][
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_method_name]['RETURN_VALUE']['a_type']
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verify_type(result, r_type)
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return result
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def update(self):
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self._set_props()
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class ClientProxy(object):
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@staticmethod
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def _intf_short_name(nm):
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return nm.split('.')[-1:][0]
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def __init__(self, specified_bus, object_path, interface=None, props=None):
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i = dbus.Interface(specified_bus.get_object(
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BUSNAME, object_path), 'org.freedesktop.DBus.Introspectable')
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introspection_xml = i.Introspect()
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# import xml.dom.minidom
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#
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# xml = xml.dom.minidom.parseString(introspection_xml)
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# print(xml.toprettyxml())
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self.intro_spect = DbusIntrospection.introspect(introspection_xml)
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for k in self.intro_spect.keys():
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sn = ClientProxy._intf_short_name(k)
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# print('Client proxy has interface: %s %s' % (k, sn))
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if interface and interface == k and props is not None:
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ro = RemoteObject(specified_bus, object_path, k,
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self.intro_spect, props)
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else:
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ro = RemoteObject(specified_bus, object_path, k,
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self.intro_spect)
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setattr(self, sn, ro)
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self.object_path = object_path
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def update(self):
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# Go through all interfaces and update them
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for int_f in self.intro_spect.keys():
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sn = ClientProxy._intf_short_name(int_f)
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getattr(self, sn).update()
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