def _calculate_hosts(self, cluster):
"""
Calculates the hosts metadata for the cluster.
:param cluster: The name of the cluster.
:type cluster: str
"""
# XXX: Not sure which wil be more efficient: fetch all
# the host data in one etcd call and sort through
# them, or fetch the ones we need individually.
# For the MVP phase, fetch all is better.
# etcd_resp, error = cherrypy.engine.publish(
# 'store-get', '/commissaire/hosts')[0]
# if error:
try:
hosts = Hosts.retrieve()
except:
self.logger.warn(
'Etcd does not have any hosts. '
'Cannot determine cluster stats.')
return
available = unavailable = total = 0
for host in hosts.hosts:
if host.address in cluster.hostset:
total += 1
if host.status == 'active':
available += 1
else:
unavailable += 1
cluster.hosts['total'] = total
cluster.hosts['available'] = available
cluster.hosts['unavailable'] = unavailable
def on_get(self, req, resp):
"""
Handles GET requests for Hosts.
:param req: Request instance that will be passed through.
:type req: falcon.Request
:param resp: Response instance that will be passed through.
:type resp: falcon.Response
"""
try:
hosts = Hosts.retrieve()
if len(hosts.hosts) == 0:
raise Exception()
resp.status = falcon.HTTP_200
req.context["model"] = hosts
except:
# This was originally a "no content" but I think a 404 makes
# more sense if there are no hosts
self.logger.warn("Etcd does not have any hosts. Returning [] and 404.")
resp.status = falcon.HTTP_404
req.context["model"] = None
return
