def get_connection(read_only=False):
"""
Returns an object representing the connection to a virtualization
platform, or to an on-demand bare-metal provisioning platform.
This could be :mod:`nova.virt.fake.FakeConnection` in test mode,
a connection to KVM, QEMU, or UML via :mod:`libvirt_conn`, or a connection
to XenServer or Xen Cloud Platform via :mod:`xenapi`. Other platforms are
also supported.
Any object returned here must conform to the interface documented by
:mod:`FakeConnection`.
**Related flags**
:connection_type: A string literal that falls through an if/elif structure
to determine what virtualization mechanism to use.
Values may be
* fake
* libvirt
* xenapi
* vmwareapi
* baremetal
"""
# TODO(termie): maybe lazy load after initial check for permissions
# TODO(termie): check whether we can be disconnected
t = FLAGS.connection_type
if t == 'fake':
conn = fake.get_connection(read_only)
elif t == 'libvirt':
conn = libvirt_conn.get_connection(read_only)
elif t == 'xenapi':
conn = xenapi_conn.get_connection(read_only)
elif t == 'vmwareapi':
conn = vmwareapi_conn.get_connection(read_only)
elif t == 'baremetal':
conn = proxy.get_connection(read_only)
else:
raise Exception('Unknown connection type "%s"' % t)
if conn is None:
LOG.error(_('Failed to open connection to underlying virt platform'))
sys.exit(1)
return utils.check_isinstance(conn, driver.ComputeDriver)
def get_connection(read_only=False):
"""
Returns an object representing the connection to a virtualization
platform.
This could be :mod:`nova.virt.fake.FakeConnection` in test mode,
a connection to KVM, QEMU, or UML via :mod:`libvirt_conn`, or a connection
to XenServer or Xen Cloud Platform via :mod:`xenapi`.
Any object returned here must conform to the interface documented by
:mod:`FakeConnection`.
**Related flags**
:connection_type: A string literal that falls through a if/elif structure
to determine what virtualization mechanism to use.
Values may be
* fake
* libvirt
* xenapi
* vmwareapi
"""
# TODO(termie): maybe lazy load after initial check for permissions
# TODO(termie): check whether we can be disconnected
t = FLAGS.connection_type
if t == 'fake':
conn = fake.get_connection(read_only)
elif t == 'libvirt':
conn = libvirt_conn.get_connection(read_only)
elif t == 'xenapi':
conn = xenapi_conn.get_connection(read_only)
elif t == 'vmwareapi':
conn = vmwareapi_conn.get_connection(read_only)
elif t == 'baremetal':
conn = proxy.get_connection(read_only)
else:
raise Exception('Unknown connection type "%s"' % t)
if conn is None:
LOG.error(_('Failed to open connection to the hypervisor'))
sys.exit(1)
return utils.check_isinstance(conn, driver.ComputeDriver)
def test_get_info(self):
# Create the mock objects
self.mox.StubOutWithMock(dom, 'read_domains')
self.mox.StubOutWithMock(dom, 'write_domains')
# Expected calls
dom.read_domains('/tftpboot/test_fake_dom_file')\
.AndReturn(fake_domains)
dom.write_domains('/tftpboot/test_fake_dom_file', fake_domains)
self.mox.ReplayAll()
# Code under test
conn = proxy.get_connection(True)
info = conn.get_info('instance-00000001')
# Expected values
self.assertEquals(info['mem'], 16777216)
self.assertEquals(info['state'], 1)
self.assertEquals(info['num_cpu'], 1)
self.assertEquals(info['cpu_time'], 100)
self.assertEquals(info['max_mem'], 16777216)
def test_get_info(self):
# Create the mock objects
self.mox.StubOutWithMock(dom, 'read_domains')
self.mox.StubOutWithMock(dom, 'write_domains')
# Expected calls
dom.read_domains('/tftpboot/'
'test_fake_dom_file').AndReturn(fake_domains)
dom.write_domains('/tftpboot/test_fake_dom_file', fake_domains)
self.mox.ReplayAll()
# Code under test
conn = proxy.get_connection(True)
# TODO(mikalstill): this is not a very good fake instance
info = conn.get_info({'name': 'instance-00000001'})
# Expected values
self.assertEquals(info['mem'], 16777216)
self.assertEquals(info['state'], 1)
self.assertEquals(info['num_cpu'], 1)
self.assertEquals(info['cpu_time'], 100)
self.assertEquals(info['max_mem'], 16777216)
