def get_servers_for(node: Optional[Node]) -> FrozenSet[str]:
"""Return NTP servers to use for the given node."""
if node is None or node.is_region_controller or _ntp_external_only():
routable_addrs = _get_external_servers()
elif node.is_rack_controller:
# Point the rack back at all the region controllers.
regions = RegionController.objects.all()
routable_addrs_map = get_routable_address_map(regions, node)
routable_addrs = reduce_routable_address_map(routable_addrs_map)
elif node.is_machine:
# Point the node back to its primary and secondary rack controllers as
# a source of time information.
racks = node.get_boot_rack_controllers()
if len(racks) == 0:
# This machine hasn't previously booted, so use all racks. Perhaps
# we should do this anyway, and disregard boot rack information?
racks = RackController.objects.all()
routable_addrs_map = get_routable_address_map(racks, node)
routable_addrs = reduce_routable_address_map(routable_addrs_map)
else:
# Point the node back at *all* rack controllers.
racks = RackController.objects.all()
routable_addrs_map = get_routable_address_map(racks, node)
routable_addrs = reduce_routable_address_map(routable_addrs_map)
# Return a frozenset of strings, be they IP addresses or hostnames.
return frozenset(map(str, routable_addrs))
def _getPeers(self, region):
"""Return syslog peers to use for the given region."""
peer_regions = RegionController.objects.exclude(id=region.id)
peer_addresses_map = get_routable_address_map(peer_regions, region)
return frozenset(
(other_region.hostname, sorted(ip_addresses)[0])
for other_region, ip_addresses in peer_addresses_map.items())
def get_peers_for(node: Node) -> FrozenSet[str]:
"""Return NTP peers to use for the given node.
For all node types other than region or region+rack controllers, this
returns the empty set.
"""
if node is None:
return frozenset()
elif node.is_region_controller:
peer_regions = RegionController.objects.exclude(id=node.id)
peer_addresses_map = get_routable_address_map(peer_regions, node)
peer_addresses = reduce_routable_address_map(peer_addresses_map)
return frozenset(map(str, peer_addresses))
else:
return frozenset()