mirror of
https://github.com/virt-manager/virt-manager.git
synced 2024-10-27 10:25:25 +03:00
f107e39989
Init a shared log instance in virtinst/logger.py, and use that throughout the code base, so we aren't calling directly into 'logging'. This helps protect our logging output from being cluttered with other library output, as happens with some 'requests' usage
425 lines
13 KiB
Python
425 lines
13 KiB
Python
#
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# Copyright 2013, 2014, 2015 Red Hat, Inc.
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#
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# This work is licensed under the GNU GPLv2 or later.
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# See the COPYING file in the top-level directory.
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import os
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import weakref
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import libvirt
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from . import pollhelpers
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from . import support
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from . import Capabilities
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from .guest import Guest
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from .logger import log
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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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def _real_local_libvirt_version():
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"""
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Lookup the local libvirt library version, but cache the value since
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it never changes.
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"""
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key = "__virtinst_cached_getVersion"
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if not hasattr(libvirt, key):
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setattr(libvirt, key, libvirt.getVersion())
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return getattr(libvirt, key)
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class VirtinstConnection(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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@staticmethod
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def libvirt_new_enough_for_virtmanager(version):
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return _real_local_libvirt_version() >= version
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@staticmethod
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def get_app_cache_dir():
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ret = ""
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try:
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# We don't want to depend on glib for virt-install
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from gi.repository import GLib
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ret = GLib.get_user_cache_dir()
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except ImportError:
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pass
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if not ret:
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ret = os.environ.get("XDG_CACHE_HOME")
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if not ret:
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ret = os.path.expanduser("~/.cache")
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return os.path.join(ret, "virt-manager")
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@staticmethod
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def in_testsuite():
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return "VIRTINST_TEST_SUITE" in os.environ
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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._fetch_cache = {}
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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_domains = 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_cache_new_pool = None
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self.support = support.SupportCache(weakref.proxy(self))
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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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ret = 0
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if self._libvirtconn:
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ret = self._libvirtconn.close()
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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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return ret
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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, authcb, cbdata):
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# Mirror the set of libvirt.c virConnectCredTypeDefault
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valid_auth_options = [
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libvirt.VIR_CRED_AUTHNAME,
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libvirt.VIR_CRED_ECHOPROMPT,
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libvirt.VIR_CRED_REALM,
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libvirt.VIR_CRED_PASSPHRASE,
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libvirt.VIR_CRED_NOECHOPROMPT,
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libvirt.VIR_CRED_EXTERNAL,
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]
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open_flags = 0
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conn = libvirt.openAuth(self._open_uri,
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[valid_auth_options, authcb, cbdata],
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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_DOMAINS = "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 _fetch_all_domains_raw(self):
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ignore, ignore, ret = pollhelpers.fetch_vms(
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self, {}, lambda obj, ignore: obj)
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return [Guest(weakref.proxy(self), parsexml=obj.XMLDesc(0))
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for obj in ret]
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def fetch_all_domains(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_domains:
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return self.cb_fetch_all_domains() # pylint: disable=not-callable
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key = self._FETCH_KEY_DOMAINS
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if key not in self._fetch_cache:
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self._fetch_cache[key] = self._fetch_all_domains_raw()
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return self._fetch_cache[key][:]
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def _build_pool_raw(self, poolobj):
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return StoragePool(weakref.proxy(self),
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parsexml=poolobj.XMLDesc(0))
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def _fetch_all_pools_raw(self):
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ignore, ignore, ret = pollhelpers.fetch_pools(
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self, {}, lambda obj, ignore: obj)
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return [self._build_pool_raw(poolobj) for poolobj in 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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key = self._FETCH_KEY_POOLS
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if key not in self._fetch_cache:
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self._fetch_cache[key] = self._fetch_all_pools_raw()
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return self._fetch_cache[key][:]
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def _fetch_vols_raw(self, poolxmlobj):
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ret = []
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pool = self._libvirtconn.storagePoolLookupByName(poolxmlobj.name)
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if pool.info()[0] != libvirt.VIR_STORAGE_POOL_RUNNING:
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return ret
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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.proxy(self), parsexml=xml))
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except Exception as e:
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log.debug("Fetching volume XML failed: %s", e)
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return ret
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def _fetch_all_vols_raw(self):
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ret = []
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for poolxmlobj in self.fetch_all_pools():
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ret.extend(self._fetch_vols_raw(poolxmlobj))
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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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key = self._FETCH_KEY_VOLS
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if key not in self._fetch_cache:
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self._fetch_cache[key] = self._fetch_all_vols_raw()
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return self._fetch_cache[key][:]
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def _cache_new_pool_raw(self, poolobj):
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# Make sure cache is primed
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if self._FETCH_KEY_POOLS not in self._fetch_cache:
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# Nothing cached yet, so next poll will pull in latest bits,
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# so there's nothing to do
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return
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poollist = self._fetch_cache[self._FETCH_KEY_POOLS]
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poolxmlobj = self._build_pool_raw(poolobj)
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poollist.append(poolxmlobj)
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if self._FETCH_KEY_VOLS not in self._fetch_cache:
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return
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vollist = self._fetch_cache[self._FETCH_KEY_VOLS]
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vollist.extend(self._fetch_vols_raw(poolxmlobj))
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def cache_new_pool(self, poolobj):
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"""
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Insert the passed poolobj into our cache
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"""
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if self.cb_cache_new_pool:
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# pylint: disable=not-callable
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return self.cb_cache_new_pool(poolobj)
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return self._cache_new_pool_raw(poolobj)
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def _fetch_all_nodedevs_raw(self):
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ignore, ignore, ret = pollhelpers.fetch_nodedevs(
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self, {}, lambda obj, ignore: obj)
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return [NodeDevice(weakref.proxy(self), obj.XMLDesc(0))
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for obj in 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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key = self._FETCH_KEY_NODEDEVS
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if key not in self._fetch_cache:
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self._fetch_cache[key] = self._fetch_all_nodedevs_raw()
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return self._fetch_cache[key][:]
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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 _real_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 _real_local_libvirt_version()
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if self._daemon_version is None:
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self._daemon_version = 0
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try:
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self._daemon_version = self._libvirtconn.getLibVersion()
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except Exception:
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log.debug("Error calling getLibVersion", exc_info=True)
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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 self._conn_version is None:
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self._conn_version = 0
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try:
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self._conn_version = self._libvirtconn.getVersion()
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except Exception:
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log.debug("Error calling getVersion", exc_info=True)
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return self._conn_version
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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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def support_remote_url_install(self):
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if self.in_testsuite():
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return True
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if self._magic_uri:
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return False
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if self.is_test():
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return False
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return self.support.conn_stream()
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