def _get_next_hop(self):
"""Return the cell name for the next hop. If the next hop is
the current cell, return None.
"""
if self.target_cell == self.routing_path:
return self.state_manager.my_cell_state
target_cell = self.target_cell
routing_path = self.routing_path
current_hops = routing_path.count(_PATH_CELL_SEP)
next_hop_num = current_hops + 1
dest_hops = target_cell.count(_PATH_CELL_SEP)
if dest_hops < current_hops:
reason = _("destination is %(target_cell)s but routing_path "
"is %(routing_path)s") % locals()
raise exception.CellRoutingInconsistency(reason=reason)
dest_name_parts = target_cell.split(_PATH_CELL_SEP)
if (_PATH_CELL_SEP.join(dest_name_parts[:next_hop_num]) !=
routing_path):
reason = _("destination is %(target_cell)s but routing_path "
"is %(routing_path)s") % locals()
raise exception.CellRoutingInconsistency(reason=reason)
next_hop_name = dest_name_parts[next_hop_num]
if self.direction == 'up':
next_hop = self.state_manager.get_parent_cell(next_hop_name)
else:
next_hop = self.state_manager.get_child_cell(next_hop_name)
if not next_hop:
cell_type = 'parent' if self.direction == 'up' else 'child'
reason = _("Unknown %(cell_type)s when routing to "
"%(target_cell)s") % locals()
raise exception.CellRoutingInconsistency(reason=reason)
return next_hop
def test_compute_node_get_not_found(self):
cell_compute_uuid = cells_utils.cell_with_item('cell1', uuids.cn_uuid)
with mock.patch.object(self.host_api.cells_rpcapi, 'compute_node_get',
side_effect=exception.CellRoutingInconsistency(
reason='because_cells_v1')):
self.assertRaises(exception.ComputeHostNotFound,
self.host_api.compute_node_get,
self.ctxt, cell_compute_uuid)
