def is_cluster_leader():
if not CloudHost.ENABLED['cloudwatch']:
return False
cluster = CloudHost.INSTALL_ID
instances = CloudHost.get_autoscaled_instances()
leader = JBoxDynConfig.get_cluster_leader(cluster)
ami_recentness = CloudHost.get_ami_recentness()
JBoxDB.log_debug("cluster: %s. instances: %s. leader: %s. ami_recentness: %d",
cluster, repr(instances), repr(leader), ami_recentness)
# if none set, or set instance is dead elect self as leader, but wait till next cycle to prevent conflicts
if (leader is None) or (leader not in instances) and (ami_recentness >= 0):
JBoxDB.log_info("setting self (%s) as cluster leader", CloudHost.instance_id())
JBoxDynConfig.set_cluster_leader(cluster, CloudHost.instance_id())
return False
is_leader = (leader == CloudHost.instance_id())
# if running an older ami, step down from cluster leader
if (ami_recentness < 0) and is_leader:
JBoxDB.log_info("unmarking self (%s) as cluster leader", CloudHost.instance_id())
JBoxDynConfig.unset_cluster_leader(cluster)
return False
return is_leader
def is_cluster_leader():
if not CloudHost.ENABLED['cloudwatch']:
return False
cluster = CloudHost.INSTALL_ID
instances = CloudHost.get_autoscaled_instances()
leader = JBoxDynConfig.get_cluster_leader(cluster)
ami_recentness = CloudHost.get_ami_recentness()
JBoxDB.log_debug(
"cluster: %s. instances: %s. leader: %s. ami_recentness: %d", cluster,
repr(instances), repr(leader), ami_recentness)
# if none set, or set instance is dead elect self as leader, but wait till next cycle to prevent conflicts
if (leader is None) or (leader not in instances) and (ami_recentness >= 0):
JBoxDB.log_info("setting self (%s) as cluster leader",
CloudHost.instance_id())
JBoxDynConfig.set_cluster_leader(cluster, CloudHost.instance_id())
return False
is_leader = (leader == CloudHost.instance_id())
# if running an older ami, step down from cluster leader
if (ami_recentness < 0) and is_leader:
JBoxDB.log_info("unmarking self (%s) as cluster leader",
CloudHost.instance_id())
JBoxDynConfig.unset_cluster_leader(cluster)
return False
return is_leader
def handle_if_instance_info(self, is_allowed):
stats = self.get_argument('instance_info', None)
if stats is None:
return False
if not is_allowed:
AdminHandler.log_error("Show instance info not allowed for user")
response = {'code': -1, 'data': 'You do not have permissions to view these stats'}
else:
try:
if stats == 'load':
result = {}
# get cluster loads
average_load = CloudHost.get_cluster_average_stats('Load')
if None != average_load:
result['Average Load'] = average_load;
machine_loads = CloudHost.get_cluster_stats('Load')
if None != machine_loads:
for n, v in machine_loads.iteritems():
result['Instance ' + n] = v
elif stats == 'sessions':
result = {}
if CloudHost.ENABLED['autoscale']:
instances = CloudHost.get_autoscaled_instances()
else:
instances = ['localhost']
for idx in range(0, len(instances)):
inst = instances[idx]
result[inst] = JBoxContainer.sync_session_status(inst)['data']
else:
raise Exception("unknown command %s" % (stats,))
response = {'code': 0, 'data': result}
except:
AdminHandler.log_error("exception while getting stats")
AdminHandler._get_logger().exception("exception while getting stats")
response = {'code': -1, 'data': 'error getting stats'}
self.write(response)
return True