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 is_proposed_cluster_leader():
if not CloudHost.ENABLED['cloudwatch']:
return False
cluster = CloudHost.INSTALL_ID
leader = JBoxDynConfig.get_cluster_leader(cluster)
return leader == CloudHost.instance_id()
def is_proposed_cluster_leader():
if not CloudHost.ENABLED['cloudwatch']:
return False
cluster = CloudHost.INSTALL_ID
leader = JBoxDynConfig.get_cluster_leader(cluster)
return leader == CloudHost.instance_id()
def try_launch_container(cls, user_id, max_hop=False):
sessname = unique_sessname(user_id)
cont = JBoxContainer.get_by_name(sessname)
cls.log_debug("have existing container for %s: %r", sessname, None != cont)
if cont is not None:
cls.log_debug("container running: %r", cont.is_running())
if max_hop:
self_load = CloudHost.get_instance_stats(CloudHost.instance_id(), 'Load')
if self_load < 100:
JBoxContainer.async_launch_by_name(sessname, user_id, True)
return True
is_leader = is_proposed_cluster_leader()
if ((cont is None) or (not cont.is_running())) and (not CloudHost.should_accept_session(is_leader)):
if cont is not None:
cont.async_backup_and_cleanup()
return False
JBoxContainer.async_launch_by_name(sessname, user_id, True)
return True
def try_launch_container(cls, user_id, max_hop=False):
sessname = unique_sessname(user_id)
cont = JBoxContainer.get_by_name(sessname)
cls.log_debug("have existing container for %s: %r", sessname,
None != cont)
if cont is not None:
cls.log_debug("container running: %r", cont.is_running())
if max_hop:
self_load = CloudHost.get_instance_stats(CloudHost.instance_id(),
'Load')
if self_load < 100:
JBoxContainer.async_launch_by_name(sessname, user_id, True)
return True
is_leader = is_proposed_cluster_leader()
if ((cont is None) or (not cont.is_running())) and (
not CloudHost.should_accept_session(is_leader)):
if cont is not None:
cont.async_backup_and_cleanup()
return False
JBoxContainer.async_launch_by_name(sessname, user_id, True)
return True
def set_lb_tracker_cookie(self):
self.set_cookie('lb',
signstr(CloudHost.instance_id(),
self.config('sesskey')),
expires_days=30)
def set_lb_tracker_cookie(self):
self.set_cookie('lb', signstr(CloudHost.instance_id(), self.config('sesskey')), expires_days=30)