def _get_manager(self, backend):
LOG.debug("Manager requested for volume_backend '%s'.", backend)
if backend is None:
LOG.debug("Fetching default backend.")
backend = self._get_volume_backend(allow_null_host=True)
if backend not in self.volume_managers:
msg = (_("Volume manager for backend '%s' does not exist.") %
(backend))
raise exception.BackupFailedToGetVolumeBackend(msg)
return self.volume_managers[backend]
def _get_volume_backend(self, host=None, allow_null_host=False):
if host is None:
if not allow_null_host:
msg = _("NULL host not allowed for volume backend lookup.")
raise exception.BackupFailedToGetVolumeBackend(msg)
else:
LOG.debug("Checking hostname '%s' for backend info.", host)
part = host.partition('@')
if (part[1] == '@') and (part[2] != ''):
backend = part[2]
LOG.debug("Got backend '%s'.", backend)
return backend
LOG.info(_LI("Backend not found in hostname (%s) so using default."),
host)
if 'default' not in self.volume_managers:
# For multi-backend we just pick "first" from volume managers dict
return next(iter(self.volume_managers))
return 'default'
def _get_volume_backend(self, host=None, allow_null_host=False):
if host is None:
if not allow_null_host:
msg = _("NULL host not allowed for volume backend lookup.")
raise exception.BackupFailedToGetVolumeBackend(msg)
else:
LOG.debug("Checking hostname '%s' for backend info." % (host))
part = host.partition('@')
if (part[1] == '@') and (part[2] != ''):
backend = part[2]
LOG.debug("Got backend '%s'." % (backend))
return backend
LOG.info(
_("Backend not found in hostname (%s) so using default.") % (host))
if 'default' not in self.volume_managers:
# For multi-backend we just pick the top of the list.
return self.volume_managers.keys()[0]
return 'default'
def _get_volume_backend(self, host=None, allow_null_host=False):
if host is None:
if not allow_null_host:
msg = _("NULL host not allowed for volume backend lookup.")
raise exception.BackupFailedToGetVolumeBackend(msg)
else:
LOG.debug("Checking hostname '%s' for backend info.", host)
# NOTE(xyang): If host='myhost@lvmdriver', backend='lvmdriver'
# by the logic below. This is different from extract_host.
# vol_utils.extract_host(host, 'backend')='myhost@lvmdriver'.
part = host.partition('@')
if (part[1] == '@') and (part[2] != ''):
backend = part[2]
LOG.debug("Got backend '%s'.", backend)
return backend
LOG.info("Backend not found in hostname (%s) so using default.", host)
if 'default' not in self.volume_managers:
# For multi-backend we just pick the top of the list.
return next(iter(self.volume_managers))
return 'default'
