88 lines
2.9 KiB
Python
88 lines
2.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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# Copyright (c) 2010 Citrix Systems, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Abstraction of the underlying virtualization API."""
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import sys
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from nova import flags
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from nova import log as logging
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from nova import utils
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from nova.virt import driver
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from nova.virt import fake
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from nova.virt.libvirt import connection as libvirt_conn
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from nova.virt import vmwareapi_conn
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from nova.virt.xenapi import connection as xenapi_conn
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LOG = logging.getLogger(__name__)
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FLAGS = flags.FLAGS
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"""
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In case of baremetal (FLAGS.connection_type),
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specific driver is set by FLAGS.baremetal_driver
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"""
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if FLAGS.connection_type == 'baremetal':
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from nova.virt.baremetal import proxy
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def get_connection(read_only=False):
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"""
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Returns an object representing the connection to a virtualization
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platform.
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This could be :mod:`nova.virt.fake.FakeConnection` in test mode,
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a connection to KVM, QEMU, or UML via :mod:`libvirt_conn`, or a connection
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to XenServer or Xen Cloud Platform via :mod:`xenapi`.
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Any object returned here must conform to the interface documented by
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:mod:`FakeConnection`.
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**Related flags**
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:connection_type: A string literal that falls through a if/elif structure
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to determine what virtualization mechanism to use.
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Values may be
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* fake
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* libvirt
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* xenapi
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* vmwareapi
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"""
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# TODO(termie): maybe lazy load after initial check for permissions
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# TODO(termie): check whether we can be disconnected
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t = FLAGS.connection_type
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if t == 'fake':
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conn = fake.get_connection(read_only)
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elif t == 'libvirt':
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conn = libvirt_conn.get_connection(read_only)
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elif t == 'xenapi':
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conn = xenapi_conn.get_connection(read_only)
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elif t == 'vmwareapi':
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conn = vmwareapi_conn.get_connection(read_only)
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elif t == 'baremetal':
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conn = proxy.get_connection(read_only)
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else:
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raise Exception('Unknown connection type "%s"' % t)
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if conn is None:
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LOG.error(_('Failed to open connection to the hypervisor'))
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sys.exit(1)
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return utils.check_isinstance(conn, driver.ComputeDriver)
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