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