def get(target=None):
"""Return current connection to libvirt or open a new one.
Use target to get/create the connection object linked to that object.
target must have a callable attribute named 'dispatchLibvirtEvents' which
will be registered as a callback on libvirt events.
Wrap methods of connection object so that they catch disconnection, and
take the current process down.
"""
if not is_supported():
raise NotAvailable()
with _lock:
conn = _connections.get(id(target))
if conn:
_log.debug('reusing cached container connection')
return conn
_log.debug('trying to connect to container manager')
conn = open_connection()
_connections[id(target)] = conn
if target is not None:
for event in (libvirt.VIR_DOMAIN_EVENT_ID_LIFECYCLE,
libvirt.VIR_DOMAIN_EVENT_ID_REBOOT,
libvirt.VIR_DOMAIN_EVENT_ID_RTC_CHANGE,
libvirt.VIR_DOMAIN_EVENT_ID_IO_ERROR_REASON,
libvirt.VIR_DOMAIN_EVENT_ID_GRAPHICS,
libvirt.VIR_DOMAIN_EVENT_ID_BLOCK_JOB,
libvirt.VIR_DOMAIN_EVENT_ID_WATCHDOG):
conn.domainEventRegisterAny(None,
event,
target.dispatchLibvirtEvents,
event)
return conn
def get(target=None):
"""Return current connection to libvirt or open a new one.
Use target to get/create the connection object linked to that object.
target must have a callable attribute named 'dispatchLibvirtEvents' which
will be registered as a callback on libvirt events.
Wrap methods of connection object so that they catch disconnection, and
take the current process down.
"""
if not is_supported():
raise NotAvailable()
with _lock:
conn = _connections.get(id(target))
if conn:
_log.debug('reusing cached container connection')
return conn
_log.debug('trying to connect to container manager')
conn = open_connection()
_connections[id(target)] = conn
if target is not None:
for event in (libvirt.VIR_DOMAIN_EVENT_ID_LIFECYCLE,
libvirt.VIR_DOMAIN_EVENT_ID_REBOOT,
libvirt.VIR_DOMAIN_EVENT_ID_RTC_CHANGE,
libvirt.VIR_DOMAIN_EVENT_ID_IO_ERROR_REASON,
libvirt.VIR_DOMAIN_EVENT_ID_GRAPHICS,
libvirt.VIR_DOMAIN_EVENT_ID_BLOCK_JOB,
libvirt.VIR_DOMAIN_EVENT_ID_WATCHDOG):
conn.domainEventRegisterAny(None, event,
target.dispatchLibvirtEvents,
event)
return conn
def open_connection(uri=None, username=None, passwd=None):
"""
by calling this method you are getting a new and unwrapped connection
if you want to use wrapped and cached connection use the get() method
"""
# no argument is needed, they are present only to mimic libvirtconnection
if not is_supported():
raise NotAvailable()
return vdsm.virt.containers.connection.Connection()
def open_connection(uri=None, username=None, passwd=None):
"""
by calling this method you are getting a new and unwrapped connection
if you want to use wrapped and cached connection use the get() method
"""
# no argument is needed, they are present only to mimic libvirtconnection
if not is_supported():
raise NotAvailable()
return vdsm.virt.containers.connection.Connection()
