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3e176f2aa4
This only has one user in interface.py. That case is indeed weird but we can implement it there, rather than in generic code
756 lines
27 KiB
Python
756 lines
27 KiB
Python
#
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# Base class for all VM devices
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#
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# Copyright 2008, 2013 Red Hat, Inc.
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# Cole Robinson <crobinso@redhat.com>
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#
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# This work is licensed under the GNU GPLv2.
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# See the COPYING file in the top-level directory.
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import collections
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import logging
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import os
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import re
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import string # pylint: disable=deprecated-module
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from .xmlapi import XMLAPI
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from . import util
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# pylint: disable=protected-access
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# This whole file is calling around into non-public functions that we
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# don't want regular API users to touch
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_trackprops = bool("VIRTINST_TEST_SUITE" in os.environ)
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_allprops = []
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_seenprops = []
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class _XMLChildList(list):
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"""
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Little wrapper for a list containing XMLChildProperty output.
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This is just to insert a dynamically created add_new() function
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which instantiates and appends a new child object
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"""
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def __init__(self, childclass, copylist, xmlbuilder):
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list.__init__(self)
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self._childclass = childclass
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self._xmlbuilder = xmlbuilder
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for i in copylist:
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self.append(i)
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def new(self):
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"""
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Instantiate a new child object and return it
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"""
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return self._childclass(self._xmlbuilder.conn)
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def add_new(self):
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"""
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Instantiate a new child object, append it, and return it
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"""
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obj = self.new()
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self._xmlbuilder.add_child(obj)
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return obj
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class XMLChildProperty(property):
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"""
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Property that points to a class used for parsing a subsection of
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of the parent XML. For example when we deligate parsing
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/domain/cpu/feature of the /domain/cpu class.
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@child_class: XMLBuilder class this property is tracking. So for
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guest.devices.disk this is DeviceDisk
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@relative_xpath: Relative location where the class is rooted compared
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to its xmlbuilder root path. So if xmlbuilder is ./foo and we
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want to track ./foo/bar/baz instances, set relative_xpath=./bar
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@is_single: If True, this represents an XML node that is only expected
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to appear once, like <domain><cpu>
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"""
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def __init__(self, child_class, relative_xpath=".", is_single=False):
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self.child_class = child_class
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self.is_single = is_single
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self.relative_xpath = relative_xpath
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self._propname = None
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property.__init__(self, self._fget)
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def __repr__(self):
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return "<XMLChildProperty %s %s>" % (str(self.child_class), id(self))
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def _findpropname(self, xmlbuilder):
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if self._propname is None:
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for key, val in xmlbuilder._all_child_props().items():
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if val is self:
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self._propname = key
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break
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if self._propname is None:
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raise RuntimeError("Didn't find expected property=%s" % self)
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return self._propname
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def _get(self, xmlbuilder):
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propname = self._findpropname(xmlbuilder)
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if propname not in xmlbuilder._propstore and not self.is_single:
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xmlbuilder._propstore[propname] = []
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return xmlbuilder._propstore[propname]
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def _fget(self, xmlbuilder):
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if self.is_single:
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return self._get(xmlbuilder)
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return _XMLChildList(self.child_class,
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self._get(xmlbuilder),
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xmlbuilder)
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def clear(self, xmlbuilder):
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if self.is_single:
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self._get(xmlbuilder).clear()
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else:
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for obj in self._get(xmlbuilder)[:]:
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xmlbuilder.remove_child(obj)
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def append(self, xmlbuilder, newobj):
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self._get(xmlbuilder).append(newobj)
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def remove(self, xmlbuilder, obj):
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self._get(xmlbuilder).remove(obj)
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def set(self, xmlbuilder, obj):
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xmlbuilder._propstore[self._findpropname(xmlbuilder)] = obj
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def get_prop_xpath(self, _xmlbuilder, obj):
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return self.relative_xpath + "/" + obj._XML_ROOT_NAME
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class XMLProperty(property):
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def __init__(self, xpath,
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set_converter=None, validate_cb=None,
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is_bool=False, is_int=False, is_yesno=False, is_onoff=False,
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default_cb=None, default_name=None, do_abspath=False):
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"""
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Set a XMLBuilder class property that maps to a value in an XML
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document, indicated by the passed xpath. For example, for a
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<domain><name> the definition may look like:
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name = XMLProperty("./name")
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When building XML from scratch (virt-install), 'name' works
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similar to a regular class property(). When parsing and editing
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existing guest XML, we use the xpath value to get/set the value
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in the parsed XML document.
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:param xpath: xpath string which maps to the associated property
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in a typical XML document
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:param name: Just a string to print for debugging, only needed
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if xpath isn't specified.
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:param set_converter: optional function for converting the property
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value from the virtinst API to the guest XML. For example,
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the Guest.memory API was once in MiB, but the libvirt domain
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memory API is in KiB. So, if xpath is specified, on a 'get'
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operation we convert the XML value with int(val) / 1024.
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:param validate_cb: Called once when value is set, should
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raise a RuntimeError if the value is not proper.
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:param is_bool: Whether this is a boolean property in the XML
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:param is_int: Whether this is an integer property in the XML
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:param is_yesno: Whether this is a yes/no property in the XML
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:param is_onoff: Whether this is an on/off property in the XML
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:param default_cb: If building XML from scratch, and this property
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is never explicitly altered, this function is called for setting
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a default value in the XML, and for any 'get' call before the
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first explicit 'set'.
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:param default_name: If the user does a set and passes in this
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value, instead use the value of default_cb()
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:param do_abspath: If True, run os.path.abspath on the passed value
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"""
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self._xpath = xpath
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if not self._xpath:
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raise RuntimeError("XMLProperty: xpath must be passed.")
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self._propname = None
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self._is_bool = is_bool
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self._is_int = is_int
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self._is_yesno = is_yesno
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self._is_onoff = is_onoff
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self._do_abspath = do_abspath
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self._validate_cb = validate_cb
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self._convert_value_for_setter_cb = set_converter
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self._default_cb = default_cb
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self._default_name = default_name
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if sum([int(bool(i)) for i in
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[self._is_bool, self._is_int,
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self._is_yesno, self._is_onoff]]) > 1:
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raise RuntimeError("Conflict property converter options.")
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if self._default_name and not self._default_cb:
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raise RuntimeError("default_name requires default_cb.")
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self._is_tracked = False
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if _trackprops:
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_allprops.append(self)
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property.__init__(self, fget=self.getter, fset=self.setter)
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def __repr__(self):
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return "<XMLProperty %s %s>" % (str(self._xpath), id(self))
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####################
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# Internal helpers #
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####################
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def _findpropname(self, xmlbuilder):
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"""
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Map the raw property() instance to the param name it's exposed
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as in the XMLBuilder class. This is just for debug purposes.
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"""
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if self._propname is None:
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for key, val in xmlbuilder._all_xml_props().items():
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if val is self:
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self._propname = key
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break
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if self._propname is None:
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raise RuntimeError("Didn't find expected property=%s" % self)
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return self._propname
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def _convert_get_value(self, val):
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# pylint: disable=redefined-variable-type
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if self._default_name and val == self._default_name:
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ret = val
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elif self._is_bool:
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ret = bool(val)
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elif self._is_int and val is not None:
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intkwargs = {}
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if "0x" in str(val):
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intkwargs["base"] = 16
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ret = int(val, **intkwargs)
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elif self._is_yesno and val is not None:
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ret = bool(val == "yes")
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elif self._is_onoff and val is not None:
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ret = bool(val == "on")
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else:
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ret = val
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return ret
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def _convert_set_value(self, xmlbuilder, val):
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if self._default_name and val == self._default_name:
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val = self._default_cb(xmlbuilder)
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elif self._do_abspath and val is not None:
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val = os.path.abspath(val)
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elif self._is_onoff and val is not None:
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val = bool(val) and "on" or "off"
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elif self._is_yesno and val is not None:
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val = bool(val) and "yes" or "no"
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elif self._is_int and val is not None:
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intkwargs = {}
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if "0x" in str(val):
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intkwargs["base"] = 16
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val = int(val, **intkwargs)
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if self._convert_value_for_setter_cb:
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val = self._convert_value_for_setter_cb(xmlbuilder, val)
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return val
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def _prop_is_unset(self, xmlbuilder):
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propname = self._findpropname(xmlbuilder)
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return (propname not in xmlbuilder._propstore)
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def _default_get_value(self, xmlbuilder):
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"""
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Return (can use default, default value)
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"""
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ret = (False, -1)
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if not xmlbuilder._xmlstate.is_build:
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return ret
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if not self._prop_is_unset(xmlbuilder):
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return ret
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if not self._default_cb:
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return ret
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if self._default_name:
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return (True, self._default_name)
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return (True, self._default_cb(xmlbuilder))
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def _set_default(self, xmlbuilder):
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"""
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Encode the property default into the XML and propstore, but
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only if a default is registered, and only if the property was
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not already explicitly set by the API user.
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This is called during the get_xml_config process and shouldn't
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be called from outside this file.
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"""
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candefault, val = self._default_get_value(xmlbuilder)
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if not candefault:
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return
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self.setter(xmlbuilder, val, validate=False)
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def _nonxml_fset(self, xmlbuilder, val):
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"""
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This stores the value in XMLBuilder._propstore
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dict as propname->value. This saves us from having to explicitly
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track every variable.
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"""
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propstore = xmlbuilder._propstore
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propname = self._findpropname(xmlbuilder)
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propstore.pop(propname, None)
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propstore[propname] = val
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def _nonxml_fget(self, xmlbuilder):
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"""
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The flip side to nonxml_fset, fetch the value from
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XMLBuilder._propstore
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"""
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candefault, val = self._default_get_value(xmlbuilder)
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if candefault:
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return val
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propname = self._findpropname(xmlbuilder)
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return xmlbuilder._propstore.get(propname, None)
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def clear(self, xmlbuilder):
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# We only unset the cached data, since XML will be cleared elsewhere
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propstore = xmlbuilder._propstore
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propname = self._findpropname(xmlbuilder)
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if propname in propstore:
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self.setter(xmlbuilder, None)
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##################################
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# The actual getter/setter impls #
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##################################
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def getter(self, xmlbuilder):
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"""
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Fetch value at user request. If we are parsing existing XML and
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the user hasn't done a 'set' yet, return the value from the XML,
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otherwise return the value from propstore
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If this is a built from scratch object, we never pull from XML
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since it's known to the empty, and we may want to return
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a 'default' value
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"""
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if _trackprops and not self._is_tracked:
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_seenprops.append(self)
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self._is_tracked = True
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# pylint: disable=redefined-variable-type
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if (self._prop_is_unset(xmlbuilder) and
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not xmlbuilder._xmlstate.is_build):
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val = self._get_xml(xmlbuilder)
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else:
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val = self._nonxml_fget(xmlbuilder)
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ret = self._convert_get_value(val)
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return ret
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def _get_xml(self, xmlbuilder):
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"""
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Actually fetch the associated value from the backing XML
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"""
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xpath = xmlbuilder._xmlstate.make_abs_xpath(self._xpath)
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return xmlbuilder._xmlstate.xmlapi.get_xpath_content(
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xpath, self._is_bool)
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def setter(self, xmlbuilder, val, validate=True):
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"""
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Set the value at user request. This just stores the value
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in propstore. Setting the actual XML is only done at
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get_xml_config time.
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"""
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if _trackprops and not self._is_tracked:
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_seenprops.append(self)
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self._is_tracked = True
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if validate and self._validate_cb:
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self._validate_cb(xmlbuilder, val)
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self._nonxml_fset(xmlbuilder,
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self._convert_set_value(xmlbuilder, val))
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def _set_xml(self, xmlbuilder, setval):
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"""
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Actually set the passed value in the XML document
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"""
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xpath = xmlbuilder._xmlstate.make_abs_xpath(self._xpath)
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xmlbuilder._xmlstate.xmlapi.set_xpath_content(xpath, setval)
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class _XMLState(object):
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def __init__(self, root_name, parsexml, parentxmlstate,
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relative_object_xpath):
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self._root_name = root_name
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self._namespace = ""
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if ":" in self._root_name:
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ns = self._root_name.split(":")[0]
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self._namespace = " xmlns:%s='%s'" % (ns, XMLAPI.NAMESPACES[ns])
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# xpath of this object relative to its parent. So for a standalone
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# <disk> this is empty, but if the disk is the forth one in a <domain>
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# it will be set to ./devices/disk[4]
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self._relative_object_xpath = relative_object_xpath or ""
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# xpath of the parent. For a disk in a standalone <domain>, this
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# is empty, but if the <domain> is part of a <domainsnapshot>,
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# it will be "./domain"
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self._parent_xpath = (
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parentxmlstate and parentxmlstate.abs_xpath()) or ""
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self.xmlapi = None
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self.is_build = False
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if not parsexml and not parentxmlstate:
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self.is_build = True
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self.parse(parsexml, parentxmlstate)
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def parse(self, parsexml, parentxmlstate):
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if parentxmlstate:
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self.is_build = parentxmlstate.is_build or self.is_build
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self.xmlapi = parentxmlstate.xmlapi
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return
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# Make sure passed in XML has required xmlns inserted
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if not parsexml:
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parsexml = "<%s%s/>" % (self._root_name, self._namespace)
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elif self._namespace and "xmlns" not in parsexml:
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parsexml = parsexml.replace("<" + self._root_name,
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"<" + self._root_name + self._namespace)
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try:
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self.xmlapi = XMLAPI(parsexml)
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except Exception:
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logging.debug("Error parsing xml=\n%s", parsexml)
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raise
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def set_relative_object_xpath(self, xpath):
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self._relative_object_xpath = xpath or ""
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def set_parent_xpath(self, xpath):
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self._parent_xpath = xpath or ""
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def _join_xpath(self, x1, x2):
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if x1.endswith("/"):
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x1 = x1[:-1]
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if x2.startswith("."):
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x2 = x2[1:]
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return x1 + x2
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def abs_xpath(self):
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return self._join_xpath(self._parent_xpath or ".",
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self._relative_object_xpath or ".")
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def make_abs_xpath(self, xpath):
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"""
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Convert a relative xpath to an absolute xpath. So for DeviceDisk
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that's part of a Guest, accessing driver_name will do convert:
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./driver/@name
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to an absolute xpath like:
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./devices/disk[3]/driver/@name
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"""
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return self._join_xpath(self.abs_xpath() or ".", xpath)
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class XMLBuilder(object):
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"""
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Base for all classes which build or parse domain XML
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"""
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# Order that we should apply values to the XML. Keeps XML generation
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# consistent with what the test suite expects.
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_XML_PROP_ORDER = []
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# Name of the root XML element
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_XML_ROOT_NAME = None
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# In some cases, libvirt can incorrectly generate unparseable XML.
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# These are libvirt bugs, but this allows us to work around it in
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# for specific XML classes.
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#
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# Example: nodedev 'system' XML:
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# https://bugzilla.redhat.com/show_bug.cgi?id=1184131
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_XML_SANITIZE = False
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def __init__(self, conn, parsexml=None,
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parentxmlstate=None, relative_object_xpath=None):
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"""
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Initialize state
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:param conn: VirtinstConnection to validate device against
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:param parsexml: Optional XML string to parse
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The rest of the parameters are for internal use only
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"""
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self.conn = conn
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if self._XML_SANITIZE:
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if hasattr(parsexml, 'decode'):
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parsexml = parsexml.decode("ascii", "ignore").encode("ascii")
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else:
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parsexml = parsexml.encode("ascii", "ignore").decode("ascii")
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parsexml = "".join([c for c in parsexml if c in string.printable])
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self._propstore = collections.OrderedDict()
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self._xmlstate = _XMLState(self._XML_ROOT_NAME,
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parsexml, parentxmlstate,
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relative_object_xpath)
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self._initial_child_parse()
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def _initial_child_parse(self):
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# Walk the XML tree and hand of parsing to any registered
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# child classes
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for xmlprop in list(self._all_child_props().values()):
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child_class = xmlprop.child_class
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prop_path = xmlprop.get_prop_xpath(self, child_class)
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if xmlprop.is_single:
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obj = child_class(self.conn,
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parentxmlstate=self._xmlstate,
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relative_object_xpath=prop_path)
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xmlprop.set(self, obj)
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|
continue
|
|
|
|
if self._xmlstate.is_build:
|
|
continue
|
|
|
|
nodecount = self._xmlstate.xmlapi.count(
|
|
self._xmlstate.make_abs_xpath(prop_path))
|
|
for idx in range(nodecount):
|
|
idxstr = "[%d]" % (idx + 1)
|
|
obj = child_class(self.conn,
|
|
parentxmlstate=self._xmlstate,
|
|
relative_object_xpath=(prop_path + idxstr))
|
|
xmlprop.append(self, obj)
|
|
|
|
def __repr__(self):
|
|
return "<%s %s %s>" % (self.__class__.__name__.split(".")[-1],
|
|
self._XML_ROOT_NAME, id(self))
|
|
|
|
|
|
############################
|
|
# Public XML managing APIs #
|
|
############################
|
|
|
|
def get_xml_config(self):
|
|
"""
|
|
Return XML string of the object
|
|
"""
|
|
xmlapi = self._xmlstate.xmlapi
|
|
if self._xmlstate.is_build:
|
|
xmlapi = xmlapi.copy_api()
|
|
|
|
self._add_parse_bits(xmlapi)
|
|
ret = xmlapi.get_xml(self._xmlstate.make_abs_xpath("."))
|
|
|
|
if ret and not ret.endswith("\n"):
|
|
ret += "\n"
|
|
return ret
|
|
|
|
def clear(self, leave_stub=False):
|
|
"""
|
|
Wipe out all properties of the object
|
|
|
|
:param leave_stub: if True, don't unlink the top stub node,
|
|
see virtinst/cli usage for an explanation
|
|
"""
|
|
props = list(self._all_xml_props().values())
|
|
props += list(self._all_child_props().values())
|
|
for prop in props:
|
|
prop.clear(self)
|
|
|
|
is_child = bool(re.match("^.*\[\d+\]$", self._xmlstate.abs_xpath()))
|
|
if is_child or leave_stub:
|
|
# User requested to clear an object that is the child of
|
|
# another object (xpath ends in [1] etc). We can't fully remove
|
|
# the node in that case, since then the xmlbuilder object is
|
|
# no longer valid, and all the other child xpaths will be
|
|
# pointing to the wrong node. So just stub out the content
|
|
self._xmlstate.xmlapi.node_clear(self._xmlstate.abs_xpath())
|
|
else:
|
|
self._xmlstate.xmlapi.node_force_remove(self._xmlstate.abs_xpath())
|
|
|
|
def validate(self):
|
|
"""
|
|
Validate any set values and raise an exception if there's
|
|
a problem
|
|
"""
|
|
pass
|
|
|
|
def set_defaults(self, guest):
|
|
"""
|
|
Encode any default values if needed
|
|
"""
|
|
ignore = guest
|
|
|
|
def get_xml_id(self):
|
|
"""
|
|
Return the location of the object in the XML document. This is
|
|
basically the absolute xpath, but the value returned should be
|
|
treated as opaque, it's just for cross XML comparisons. Used
|
|
in virt-manager code
|
|
"""
|
|
return self._xmlstate.abs_xpath()
|
|
|
|
|
|
################
|
|
# Internal API #
|
|
################
|
|
|
|
def __get_prop_cache(self, cachename, checkclass):
|
|
if not hasattr(self.__class__, cachename):
|
|
ret = {}
|
|
for c in reversed(type.mro(self.__class__)[:-1]):
|
|
for key, val in c.__dict__.items():
|
|
if isinstance(val, checkclass):
|
|
ret[key] = val
|
|
setattr(self.__class__, cachename, ret)
|
|
return getattr(self.__class__, cachename)
|
|
|
|
def _all_xml_props(self):
|
|
"""
|
|
Return a list of all XMLProperty instances that this class has.
|
|
"""
|
|
cachename = self.__class__.__name__ + "_cached_xml_props"
|
|
return self.__get_prop_cache(cachename, XMLProperty)
|
|
|
|
def _all_child_props(self):
|
|
"""
|
|
Return a list of all XMLChildProperty instances that this class has.
|
|
"""
|
|
cachename = self.__class__.__name__ + "_cached_child_props"
|
|
return self.__get_prop_cache(cachename, XMLChildProperty)
|
|
|
|
def _find_child_prop(self, child_class, return_single=False):
|
|
xmlprops = self._all_child_props()
|
|
for xmlprop in list(xmlprops.values()):
|
|
if xmlprop.is_single and not return_single:
|
|
continue
|
|
if child_class is xmlprop.child_class:
|
|
return xmlprop
|
|
raise RuntimeError("programming error: "
|
|
"Didn't find child property for child_class=%s" %
|
|
child_class)
|
|
|
|
def _set_xpaths(self, parent_xpath, relative_object_xpath=-1):
|
|
"""
|
|
Change the object hierarchy's cached xpaths
|
|
"""
|
|
self._xmlstate.set_parent_xpath(parent_xpath)
|
|
if relative_object_xpath != -1:
|
|
self._xmlstate.set_relative_object_xpath(relative_object_xpath)
|
|
for propname in self._all_child_props():
|
|
for p in util.listify(getattr(self, propname, [])):
|
|
p._set_xpaths(self._xmlstate.abs_xpath())
|
|
|
|
def _set_child_xpaths(self):
|
|
"""
|
|
Walk the list of child properties and make sure their
|
|
xpaths point at their particular element. Needs to be called
|
|
whenever child objects are added or removed
|
|
"""
|
|
typecount = {}
|
|
for propname, xmlprop in self._all_child_props().items():
|
|
for obj in util.listify(getattr(self, propname)):
|
|
idxstr = ""
|
|
if not xmlprop.is_single:
|
|
class_type = obj.__class__
|
|
if class_type not in typecount:
|
|
typecount[class_type] = 0
|
|
typecount[class_type] += 1
|
|
idxstr = "[%d]" % typecount[class_type]
|
|
|
|
prop_path = xmlprop.get_prop_xpath(self, obj)
|
|
obj._set_xpaths(self._xmlstate.abs_xpath(),
|
|
prop_path + idxstr)
|
|
|
|
def _parse_with_children(self, *args, **kwargs):
|
|
"""
|
|
Set new backing XML objects in ourselves and all our child props
|
|
"""
|
|
self._xmlstate.parse(*args, **kwargs)
|
|
for propname in self._all_child_props():
|
|
for p in util.listify(getattr(self, propname, [])):
|
|
p._parse_with_children(None, self._xmlstate)
|
|
|
|
def add_child(self, obj):
|
|
"""
|
|
Insert the passed XMLBuilder object into our XML document. The
|
|
object needs to have an associated mapping via XMLChildProperty
|
|
"""
|
|
xmlprop = self._find_child_prop(obj.__class__)
|
|
xml = obj.get_xml_config()
|
|
xmlprop.append(self, obj)
|
|
self._set_child_xpaths()
|
|
|
|
if not obj._xmlstate.is_build:
|
|
use_xpath = obj._xmlstate.abs_xpath().rsplit("/", 1)[0]
|
|
indent = 2 * obj._xmlstate.abs_xpath().count("/")
|
|
self._xmlstate.xmlapi.node_add_xml(
|
|
util.xml_indent(xml, indent), use_xpath)
|
|
obj._parse_with_children(None, self._xmlstate)
|
|
|
|
def remove_child(self, obj):
|
|
"""
|
|
Remove the passed XMLBuilder object from our XML document, but
|
|
ensure its data isn't altered.
|
|
"""
|
|
xmlprop = self._find_child_prop(obj.__class__)
|
|
xmlprop.remove(self, obj)
|
|
|
|
xpath = obj._xmlstate.abs_xpath()
|
|
xml = obj.get_xml_config()
|
|
obj._set_xpaths(None, None)
|
|
obj._parse_with_children(xml, None)
|
|
self._xmlstate.xmlapi.node_force_remove(xpath)
|
|
self._set_child_xpaths()
|
|
|
|
|
|
#################################
|
|
# Private XML building routines #
|
|
#################################
|
|
|
|
def _add_parse_bits(self, xmlapi):
|
|
"""
|
|
Callback that adds the implicitly tracked XML properties to
|
|
the backing xml.
|
|
"""
|
|
origpropstore = self._propstore.copy()
|
|
origapi = self._xmlstate.xmlapi
|
|
try:
|
|
self._xmlstate.xmlapi = xmlapi
|
|
return self._do_add_parse_bits()
|
|
finally:
|
|
self._xmlstate.xmlapi = origapi
|
|
self._propstore = origpropstore
|
|
|
|
def _do_add_parse_bits(self):
|
|
# Set all defaults if the properties have one registered
|
|
xmlprops = self._all_xml_props()
|
|
childprops = self._all_child_props()
|
|
|
|
for prop in list(xmlprops.values()):
|
|
prop._set_default(self)
|
|
|
|
# Set up preferred XML ordering
|
|
do_order = [p for p in self._propstore if p not in childprops]
|
|
for key in reversed(self._XML_PROP_ORDER):
|
|
if key not in xmlprops and key not in childprops:
|
|
raise RuntimeError("programming error: key '%s' must be "
|
|
"xml prop or child prop" % key)
|
|
if key in do_order:
|
|
do_order.remove(key)
|
|
do_order.insert(0, key)
|
|
elif key in childprops:
|
|
do_order.insert(0, key)
|
|
|
|
for key in sorted(list(childprops.keys())):
|
|
if key not in do_order:
|
|
do_order.append(key)
|
|
|
|
# Alter the XML
|
|
for key in do_order:
|
|
if key in xmlprops:
|
|
xmlprops[key]._set_xml(self, self._propstore[key])
|
|
elif key in childprops:
|
|
for obj in util.listify(getattr(self, key)):
|
|
obj._add_parse_bits(self._xmlstate.xmlapi)
|