def get_topology(self, topologyName, callback=None):
if callback:
self.topology_watchers[topologyName].append(callback)
else:
topology_path = self.get_topology_path(topologyName)
with open(topology_path) as f:
data = f.read()
topology = Topology()
topology.ParseFromString(data)
return topology
def watch_topology(data, stats):
if data:
topology = Topology()
topology.ParseFromString(data)
callback(topology)
else:
callback(None)
# Returning False will result in no future watches
# being triggered. If isWatching is True, then
# the future watches will be triggered.
return isWatching