428 lines
14 KiB
Python
428 lines
14 KiB
Python
#
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# Copyright 2013, 2014, 2015 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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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, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301 USA.
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import logging
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import weakref
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import libvirt
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from virtcli import CLIConfig
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from . import pollhelpers
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from . import support
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from . import util
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from . import Capabilities
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from .guest import Guest
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from .nodedev import NodeDevice
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from .storage import StoragePool, StorageVolume
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from .uri import URI, MagicURI
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class VirtualConnection(object):
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"""
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Wrapper for libvirt connection that provides various bits like
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- caching static data
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- lookup for API feature support
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- simplified API wrappers that handle new and old ways of doing things
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"""
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def __init__(self, uri):
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_initial_uri = uri or ""
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if MagicURI.uri_is_magic(_initial_uri):
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self._magic_uri = MagicURI(_initial_uri)
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self._open_uri = self._magic_uri.open_uri
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self._uri = self._magic_uri.make_fake_uri()
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self._fake_conn_predictable = self._magic_uri.predictable
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self._fake_conn_remote = self._magic_uri.remote
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self._fake_conn_session = self._magic_uri.session
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self._fake_conn_version = self._magic_uri.conn_version
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self._fake_libvirt_version = self._magic_uri.libvirt_version
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else:
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self._magic_uri = None
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self._open_uri = _initial_uri
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self._uri = _initial_uri
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self._fake_conn_predictable = False
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self._fake_conn_remote = False
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self._fake_conn_session = False
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self._fake_libvirt_version = None
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self._fake_conn_version = None
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self._daemon_version = None
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self._conn_version = None
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self._libvirtconn = None
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self._uriobj = URI(self._uri)
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self._caps = None
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self._support_cache = {}
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self._fetch_cache = {}
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# Setting this means we only do fetch_all* once and just carry
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# the result. For the virt-* CLI tools this ensures any revalidation
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# isn't hammering the connection over and over
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self.cache_object_fetch = False
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# These let virt-manager register a callback which provides its
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# own cached object lists, rather than doing fresh calls
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self.cb_fetch_all_guests = None
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self.cb_fetch_all_pools = None
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self.cb_fetch_all_vols = None
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self.cb_fetch_all_nodedevs = None
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self.cb_clear_cache = None
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##############
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# Properties #
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##############
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def __getattr__(self, attr):
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if attr in self.__dict__:
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return self.__dict__[attr]
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# Proxy virConnect API calls
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libvirtconn = self.__dict__.get("_libvirtconn")
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return getattr(libvirtconn, attr)
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def _get_uri(self):
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return self._uri or self._open_uri
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uri = property(_get_uri)
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def _get_caps(self):
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if not self._caps:
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self._caps = Capabilities(self,
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self._libvirtconn.getCapabilities())
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return self._caps
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caps = property(_get_caps)
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def get_conn_for_api_arg(self):
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return self._libvirtconn
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##############
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# Public API #
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##############
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def is_closed(self):
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return not bool(self._libvirtconn)
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def close(self):
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self._libvirtconn = None
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self._uri = None
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self._fetch_cache = {}
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def fake_conn_predictable(self):
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return self._fake_conn_predictable
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def invalidate_caps(self):
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self._caps = None
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def is_open(self):
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return bool(self._libvirtconn)
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def open(self, passwordcb):
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open_flags = 0
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valid_auth_options = [libvirt.VIR_CRED_AUTHNAME,
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libvirt.VIR_CRED_PASSPHRASE]
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authcb = self._auth_cb
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authcb_data = passwordcb
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conn = libvirt.openAuth(self._open_uri,
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[valid_auth_options, authcb,
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(authcb_data, valid_auth_options)],
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open_flags)
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if self._magic_uri:
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self._magic_uri.overwrite_conn_functions(conn)
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self._libvirtconn = conn
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if not self._open_uri:
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self._uri = self._libvirtconn.getURI()
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self._uriobj = URI(self._uri)
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def set_keep_alive(self, interval, count):
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if hasattr(self._libvirtconn, "setKeepAlive"):
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self._libvirtconn.setKeepAlive(interval, count)
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####################
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# Polling routines #
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####################
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_FETCH_KEY_GUESTS = "vms"
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_FETCH_KEY_POOLS = "pools"
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_FETCH_KEY_VOLS = "vols"
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_FETCH_KEY_NODEDEVS = "nodedevs"
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def clear_cache(self, pools=False):
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if self.cb_clear_cache:
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self.cb_clear_cache(pools=pools) # pylint: disable=not-callable
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return
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if pools:
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self._fetch_cache.pop(self._FETCH_KEY_POOLS, None)
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def _fetch_all_guests_cached(self):
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key = self._FETCH_KEY_GUESTS
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if key in self._fetch_cache:
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return self._fetch_cache[key]
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ignore, ignore, ret = pollhelpers.fetch_vms(
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self, {}, lambda obj, ignore: obj)
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ret = [Guest(weakref.ref(self), parsexml=obj.XMLDesc(0))
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for obj in ret]
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if self.cache_object_fetch:
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self._fetch_cache[key] = ret
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return ret
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def fetch_all_guests(self):
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"""
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Returns a list of Guest() objects
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"""
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if self.cb_fetch_all_guests:
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return self.cb_fetch_all_guests() # pylint: disable=not-callable
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return self._fetch_all_guests_cached()
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def _fetch_all_pools_cached(self):
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key = self._FETCH_KEY_POOLS
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if key in self._fetch_cache:
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return self._fetch_cache[key]
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ignore, ignore, ret = pollhelpers.fetch_pools(
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self, {}, lambda obj, ignore: obj)
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ret = [StoragePool(weakref.ref(self), parsexml=obj.XMLDesc(0))
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for obj in ret]
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if self.cache_object_fetch:
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self._fetch_cache[key] = ret
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return ret
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def fetch_all_pools(self):
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"""
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Returns a list of StoragePool objects
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"""
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if self.cb_fetch_all_pools:
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return self.cb_fetch_all_pools() # pylint: disable=not-callable
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return self._fetch_all_pools_cached()
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def _fetch_all_vols_cached(self):
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key = self._FETCH_KEY_VOLS
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if key in self._fetch_cache:
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return self._fetch_cache[key]
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ret = []
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for xmlobj in self.fetch_all_pools():
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pool = self._libvirtconn.storagePoolLookupByName(xmlobj.name)
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if pool.info()[0] != libvirt.VIR_STORAGE_POOL_RUNNING:
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continue
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ignore, ignore, vols = pollhelpers.fetch_volumes(
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self, pool, {}, lambda obj, ignore: obj)
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for vol in vols:
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try:
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xml = vol.XMLDesc(0)
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ret.append(StorageVolume(weakref.ref(self), parsexml=xml))
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except Exception, e:
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logging.debug("Fetching volume XML failed: %s", e)
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if self.cache_object_fetch:
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self._fetch_cache[key] = ret
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return ret
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def fetch_all_vols(self):
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"""
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Returns a list of StorageVolume objects
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"""
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if self.cb_fetch_all_vols:
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return self.cb_fetch_all_vols() # pylint: disable=not-callable
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return self._fetch_all_vols_cached()
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def _fetch_all_nodedevs_cached(self):
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key = self._FETCH_KEY_NODEDEVS
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if key in self._fetch_cache:
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return self._fetch_cache[key]
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ignore, ignore, ret = pollhelpers.fetch_nodedevs(
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self, {}, lambda obj, ignore: obj)
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ret = [NodeDevice.parse(weakref.ref(self), obj.XMLDesc(0))
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for obj in ret]
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if self.cache_object_fetch:
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self._fetch_cache[key] = ret
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return ret
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def fetch_all_nodedevs(self):
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"""
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Returns a list of NodeDevice() objects
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"""
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if self.cb_fetch_all_nodedevs:
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return self.cb_fetch_all_nodedevs() # pylint: disable=not-callable
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return self._fetch_all_nodedevs_cached()
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#########################
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# Libvirt API overrides #
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#########################
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def getURI(self):
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return self._uri
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#########################
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# Public version checks #
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#########################
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def local_libvirt_version(self):
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if self._fake_libvirt_version is not None:
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return self._fake_libvirt_version
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# This handles caching for us
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return util.local_libvirt_version()
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def daemon_version(self):
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if self._fake_libvirt_version is not None:
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return self._fake_libvirt_version
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if not self.is_remote():
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return self.local_libvirt_version()
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if not self._daemon_version:
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if not self.check_support(support.SUPPORT_CONN_LIBVERSION):
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self._daemon_version = 0
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else:
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self._daemon_version = self._libvirtconn.getLibVersion()
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return self._daemon_version
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def conn_version(self):
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if self._fake_conn_version is not None:
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return self._fake_conn_version
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if not self._conn_version:
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if not self.check_support(support.SUPPORT_CONN_GETVERSION):
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self._conn_version = 0
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else:
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self._conn_version = self._libvirtconn.getVersion()
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return self._conn_version
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def stable_defaults(self, emulator=None, force=False):
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"""
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:param force: Just check if we are running on RHEL, regardless of
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whether stable defaults are requested by the build. This is needed
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to ensure we don't enable VM devices that are compiled out on
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RHEL, like vmvga
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"""
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if not CLIConfig.stable_defaults and not force:
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return False
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if not self.is_qemu():
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return False
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if emulator:
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return str(emulator).startswith("/usr/libexec")
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for guest in self.caps.guests:
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for dom in guest.domains:
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if dom.emulator.startswith("/usr/libexec"):
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return True
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return False
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###################
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# Public URI bits #
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###################
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def is_remote(self):
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return (self._fake_conn_remote or self._uriobj.hostname)
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def is_session_uri(self):
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return (self._fake_conn_session or self.get_uri_path() == "/session")
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def get_uri_hostname(self):
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return self._uriobj.hostname
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def get_uri_port(self):
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return self._uriobj.port
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def get_uri_username(self):
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return self._uriobj.username
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def get_uri_transport(self):
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if self.get_uri_hostname() and not self._uriobj.transport:
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# Libvirt defaults to transport=tls if hostname specified but
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# no transport is specified
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return "tls"
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return self._uriobj.transport
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def get_uri_path(self):
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return self._uriobj.path
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def get_uri_driver(self):
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return self._uriobj.scheme
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def is_qemu(self):
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return self._uriobj.scheme.startswith("qemu")
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def is_qemu_system(self):
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return (self.is_qemu() and self._uriobj.path == "/system")
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def is_qemu_session(self):
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return (self.is_qemu() and self.is_session_uri())
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def is_really_test(self):
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return URI(self._open_uri).scheme.startswith("test")
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def is_test(self):
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return self._uriobj.scheme.startswith("test")
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def is_xen(self):
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return (self._uriobj.scheme.startswith("xen") or
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self._uriobj.scheme.startswith("libxl"))
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def is_lxc(self):
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return self._uriobj.scheme.startswith("lxc")
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def is_openvz(self):
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return self._uriobj.scheme.startswith("openvz")
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def is_container(self):
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return self.is_lxc() or self.is_openvz()
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def is_vz(self):
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return (self._uriobj.scheme.startswith("vz") or
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self._uriobj.scheme.startswith("parallels"))
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#########################
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# Support check helpers #
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#########################
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for _supportname in [_supportname for _supportname in dir(support) if
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_supportname.startswith("SUPPORT_")]:
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locals()[_supportname] = getattr(support, _supportname)
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def check_support(self, feature, data=None):
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key = feature
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data = data or self
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if key not in self._support_cache:
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self._support_cache[key] = support.check_support(
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self, feature, data)
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return self._support_cache[key]
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def support_remote_url_install(self):
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if self._magic_uri:
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return False
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return (self.check_support(self.SUPPORT_CONN_STREAM) and
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self.check_support(self.SUPPORT_STREAM_UPLOAD))
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###################
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# Private helpers #
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###################
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def _auth_cb(self, creds, (passwordcb, passwordcreds)):
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for cred in creds:
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if cred[0] not in passwordcreds:
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raise RuntimeError("Unknown cred type '%s', expected only "
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"%s" % (cred[0], passwordcreds))
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return passwordcb(creds)
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