class DatabaseTestCase(unittest.TestCase):
def setUp(self):
self.database = Database()
def test_get_monitors(self):
monitor = self.database.get_monitor('frank')
monitors = self.database.get_monitors()
self.assertTrue(monitor in monitors)
def test_get_groups(self):
group = self.database.get_group_by_name('quae-other')
groups = self.database.get_groups()
self.assertTrue(group in groups)
def tearDown(self):
self.database = None
class Controller:
""" Controller object. Initializes various data structures used by object. Establishes connection with XMPP server,
connects to poller, aggregator and logging Multi-User Chats and registers stanza handlers. """
def __init__(self):
self.db = Database()
entity_prefix = 'controller'
conn = Connection(entity_prefix, static=True)
self.entity_name, self.entity_suffix = conn.get_entity_name()
# List of nodes known to the controller
self.poller_map = {}
self.poller_pool = {}
self.job_map = {}
self.job_pool = []
# Message scheduler
self.sched = MessageScheduler(self.message_handler)
self.log = Logging(conn)
conn.join_muc('pollers')
conn.join_muc('aggregators')
self.parser = Parser()
self.establish_jobs()
self.conn = conn.get_conn()
self.conn.RegisterHandler('iq',self.result_handler,'result')
self.conn.RegisterHandler('iq',self.set_handler,'set')
self.conn.RegisterHandler('presence',self.presence_handler)
self.go_on()
""" Called by the presence handler when an entity connects to the aggregator or poller MUCs.
Used to inspect retreive service information from an entity, required in the XEP Jabber-RPC standard. """
def disco_lookup(self, recipient):
self.log.info('Performing discovery lookup.')
message = Iq('get', queryNS=NS_DISCO_INFO, to=recipient)
self.sched.add_message(message, self.disco_handler)
""" Method passed and used as handler for messages by MessageScheduler.
Sends messages and logs an error if message send is a retry """
# Handler used by message scheduling class
def message_handler(self, message, retry=False):
# print 'Sending message.'
if retry == True:
self.log.error('Message timed out, resending.')
self.conn.send(message)
#
# MESSAGE HANDLERS
#
""" Handler for presence stanzas recieved by the XMPP listener.
If
"""
def presence_handler(self, conn, presence_node):
sender = presence_node.getFrom()
presence_type = presence_node.getAttr('type')
# Ignore self and presence announcements from logging MUC
if sender.getResource() != 'controller':
if presence_type == 'unavailable':
if sender.getNode() == 'aggregators' or sender.getNode() == 'pollers':
self.remove_entity(sender.getNode(), sender)
elif sender.getNode() == 'aggregators' or sender.getNode() == 'pollers':
# Check the service discovery details for a connecting node.
self.disco_lookup(sender)
raise NodeProcessed
""" IQ set handler, runs RPC methods in whitelist """
def set_handler(self, conn, iq_node):
query_node = iq_node.getQueryChildren()
for node in query_node:
try:
method = node.getTagData('methodName')
method_whitelist = ['get_group', 'get_groups', 'create_group', 'update_group', 'remove_group',
'get_monitor', 'get_monitors', 'create_monitor', 'update_monitor', 'remove_monitor', 'get_monitors_by_gid',
'get_job', 'get_jobs', 'create_job', 'update_job', 'remove_job',
'get_evaluation', 'get_evaluations', 'create_evaluation', 'update_evaluation', 'remove_evaluation',
'get_results', 'get_results_day', 'get_results_week', 'get_results_hour',
'poller_failure',
'get_aggregator']
if method in method_whitelist:
method = getattr(self, method)
try:
try:
params = node.getTag('params').getChildren()
args = self.parser.get_args(params, iq_node.getFrom())
except AttributeError:
args = []
status, parameters = apply(method, args)
message = self.parser.rpc_response(iq_node.getFrom(), iq_node.getID(), status, parameters)
self.conn.send(message)
except TypeError:
# print sys.exc_info()
conn.send(iq_node.buildReply('error'))
else:
conn.send(iq_node.buildReply('error'))
self.log.error('Method not in whitelist')
except AttributeError:
traceback.print_exc()
conn.send(iq_node.buildReply('error'))
raise NodeProcessed
def result_handler(self, conn, iq_node):
# Check if the reponse is managed by scheduler
if self.sched.is_managed(int(iq_node.getAttr('id'))):
self.sched.received_response(iq_node)
raise NodeProcessed
# END MESSAGE HANDLERS
#
# BEGIN SCHEDULER RESPONSE HANDLERS
#
def disco_handler(self, sender, query_node):
if query_node.getNamespace() == NS_DISCO_INFO:
entity_type = query_node.getTagAttr('identity', 'type')
if entity_type == 'aggregator' or entity_type == 'poller':
adjusted_jid = JID(sender.getResource() + '@quae.co.uk/skynet')
category = query_node.getTagAttr('identity', 'category')
self.log.info('Registering node %s' % adjusted_jid)
self.add_entity(entity_type, category, adjusted_jid)
else:
self.log.error('Receieved iq message with incorrect namespace')
def assign_job(self, sender, query_node):
if query_node.getNamespace() == NS_RPC:
poller, job_id = self.parser.get_args_no_sender(query_node.getTag('methodResponse').getTag('params').getChildren())
poller_jid = JID(poller)
job_id = int(job_id)
job = None
for i in range(len(self.job_pool)):
if self.job_pool[i]['id'] == job_id:
job = self.job_pool.pop(i)
self.log.info('Removing job %s from the job pool' % job_id)
break
if job != None:
self.job_map[poller_jid].append(job)
self.log.info('Job %s successfully assigned to %s' % (job_id, poller_jid))
else:
self.log.error('Receieved iq message with incorrect namespace')
def poller_removed(self, sender, query_node):
if query_node.getNamespace() == NS_RPC:
args = self.parser.get_args_no_sender(query_node.getTag('methodResponse').getTag('params').getChildren())
adjusted_jid = JID(args[0])
unassigned_jobs = self.job_map.pop(adjusted_jid)
for job in unassigned_jobs:
self.log.info('Adding job %s to the job pool' % job['id'])
self.job_pool.append(job)
parent_poller = None
for aggregator, pollers in self.poller_map.items():
for poller, segment in pollers:
if poller == adjusted_jid:
parent_aggregator = aggregator
pollers.remove((poller, segment))
break
self.log.info('Removed %s from %s' % (adjusted_jid, parent_aggregator))
self.assign_pooled_jobs()
else:
self.log.error('Receieved iq message with incorrect namespace')
# END SCHEDULER HANDLERS
#
# BEGIN RPC METHODS
#
# Requested by an aggregator when an assigned poller has failed/disconnected.
def poller_failure(self, sender, previous_poller):
pollers = self.poller_map[JID(sender)]
poller_jid = JID('[email protected]/' + JID(previous_poller).getNode())
try:
pollers.remove(poller_jid)
message = 'Removed failed poller'
try:
self.rebalance_pollers()
except:
print sys.exc_info()
return 'success', [message]
except:
return 'failure', ['Failed to remove poller']
# Group operations
def get_group(self, sender, name):
group = self.db.get_group_by_name(name)
if group != None:
return 'success', [group]
return 'failure', ['No such group exists']
def get_groups(self, sender):
groups = self.db.get_groups()
if groups != None:
return 'success', [groups]
return 'failure', ['Failed to retreieve groups']
def create_group(self, sender, name, desc):
existing = self.db.get_group_by_name(name)
if existing == None:
self.db.create_group(name, desc)
return 'success', ['Sucessfully created group %s' % name]
return 'failure', ['failure']
def update_group(self, sender, id, name, desc):
group = self.db.get_group_by_id(id)
if group != None:
self.db.update_group(id, name, desc)
return 'success', ['Successfully update group %s' % name]
return 'failure', ['Failed to update group']
def remove_group(self, sender, name):
self.db.remove_group_by_name(name)
if self.db.get_group_by_name(name) == None:
return 'success', ['Successfully remove group %s' % name]
else:
return 'failure', ['Failed to remove group %s' % name]
# Monitor operations
def get_monitor(self, sender, name):
try:
monitor = self.db.get_monitor(name)
if monitor != False:
return 'success', [monitor]
except TypeError:
return 'failure', ['No such monitor exists']
return 'failure', ['No such monitor exists']
def get_monitors(self, sender, group=None):
try:
if group != None:
monitors = self.db.get_monitors(group)
else:
monitors = self.db.get_monitors()
return 'success', [monitors]
except AttributeError:
return 'failure', ['Failed to retrieve monitors']
def get_monitors_by_gid(self, sender, group_id):
try:
if group_id != None:
monitors = self.db.get_monitors_by_gid(group_id)
return 'success', [monitors]
except AttributeError:
pass
return 'failure', ['Failed to retrieve monitors']
def create_monitor(self, sender, name, description, group):
if self.db.create_monitor(name, description, group) == True:
return 'success', ['Successfully create monitor %s' % name]
return 'failure', ['Failed to create monitor']
def update_monitor(self, sender, name, description, group):
group = self.db.get_group_by_id(id)
if group != None:
self.db.update_group(id, name, desc)
return 'success', ['Successfully update monitor %s' % name]
return 'failure', ['Failed to update monitor']
def remove_monitor(self, sender, name):
self.db.remove_monitor_by_name(name)
if self.db.get_monitor_by_name(name) == None:
return 'success', ['Successfully removed monitor %s' % name]
else:
return 'failure', ['Failed to remove monitor %s' % name]
# job operations
def get_job(self, sender, mon, id):
try:
job = self.db.get_job(id, mon)
return 'success', [job]
except TypeError:
return 'failure', ['No such job exists']
def get_jobs(self, sender, mon):
try:
jobs = self.db.get_jobs(mon)
return 'success', [jobs]
except AttributeError:
return 'failure', ['Failed to retreieve jobs']
def create_job(self, sender, mon, address, protocol, frequency, interface, resource):
if self.db.get_monitor(mon) != None:
if self.db.create_job(address, protocol, frequency, interface, resource, mon) == True:
return 'success', ['Successfully created a job for %s' % mon]
return 'failure', ['Failed to create job']
def update_job(self, sender, mon, id, address, protocol, frequency, interface, resource):
existing = self.db.get_job(id, mon)
if existing != None:
self.db.update_job(id, address, protocol, frequency, interface, resource)
return 'success', ['Successfully updated job']
else:
return 'failure', ['failure']
def remove_job(self, sender, mon, id):
self.db.remove_job(id)
if self.db.get_job(id) == None:
return 'success', ['Successfully removed job']
else:
return 'failure', ['failure']
# Result read operations
def get_results(self, sender, monitor, job, start_datetime, end_datetime):
results = self.db.get_results(monitor, job, start_datetime, end_datetime)
if results == None:
return 'failure', ['No such results exist']
elif results != False:
return 'success', results
return 'failure', ['Failed to retreive specificied results']
def get_results_day(self, sender, monitor, job, start_datetime):
results = self.db.get_results_day(monitor, job, start_datetime)
if results == []:
return 'failure', ['No such results exist']
elif results != False:
job_details = self.db.get_job(job, monitor)
return 'success', [job_details, results]
return 'failure', ['Failed to retreive specificied results']
def get_results_week(self, sender, monitor, job, start_datetime):
pass
def get_results_hour(self, sender, monitor, job, start_datetime):
results = self.db.get_results_hour(monitor, job, start_datetime)
if results == []:
return 'failure', ['No such results exist']
elif results != False:
job_details = self.db.get_job(job, monitor)
return 'success', [job_details, results]
return 'failure', ['Failed to retreive specificied results']
# END RPC METHODS
#
# BEGIN PRIVATE METHODS
#
""" Called on successful DISCO request.
Will register Poller or Aggregator, send jobs or balance jobs. """
def add_entity(self, entity_type, segment, entity):
if entity_type == 'aggregator':
self.poller_map[entity] = []
# If pollers have been added, but there were no aggregators running
self.assign_pooled_pollers()
if len(self.poller_map) > 1:
self.rebalance_pollers()
self.assign_pooled_jobs()
elif entity_type == 'poller':
self.job_map[entity] = []
self.poller_pool[entity] = segment
self.assign_pooled_pollers()
if len(self.poller_map) > 1:
self.rebalance_pollers()
self.assign_pooled_jobs()
if len(self.job_map) > 1:
self.rebalance_jobs()
# Give poller to appropriate aggregator
print 'Added %s to %ss' % (entity, entity_type)
self.log.info('Node %s was successfully registered with the controller' % entity)
""" Removing Poller or Aggregator """
def remove_entity(self, entity_type, entity):
try:
if entity_type == 'aggregators':
adjusted_jid = JID(JID(entity).getResource() + '@quae.co.uk/skynet')
unassigned_pollers = self.poller_map.pop(adjusted_jid)
for poller, segment in unassigned_pollers:
self.poller_pool[poller] = segment
self.log.info('Removed %s' % adjusted_jid)
if len(self.poller_pool) > 0:
# Try and assign pooled pollers
if not self.assign_pooled_pollers():
for poller, segment in unassigned_pollers:
message = self.parser.rpc_call(poller, 'aggregator_failure', [])
self.sched.add_message(message)
elif entity_type == 'pollers':
adjusted_jid = JID(JID(entity).getResource() + '@quae.co.uk/skynet')
if len(self.poller_map) > 0:
parent_aggregator = None
for aggregator, pollers in self.poller_map.items():
for poller, segment in pollers:
if adjusted_jid == poller:
parent_aggregator = aggregator
break
if parent_aggregator != None:
remove_call = self.parser.rpc_call(parent_aggregator, 'remove_poller', [str(adjusted_jid)])
self.sched.add_message(remove_call, self.poller_removed)
else:
try:
self.job_map.pop(adjusted_jid)
self.poller_pool.pop(adjusted_jid)
self.log.info('Poller not assigned, sucessfully removed')
except:
self.log.error('Failed to remove poller')
traceback.print_exc()
except ValueError:
self.log.error('Failed to remove %s' % entity)
""" Assign unassigned pollers """
def assign_pooled_pollers(self):
if len(self.poller_map) > 0:
while len(self.poller_pool) > 0:
unassigned_poller, segment = self.poller_pool.popitem()
chosen_aggregator = None
poller_comp = None
for aggregator, pollers in self.poller_map.items():
# If first loop or number of pollers assigned to aggregator is less than comp, make this agg the comp
if (chosen_aggregator == None and poller_comp == None) or len(pollers) < poller_comp:
chosen_aggregator = aggregator
poller_comp = len(pollers)
if chosen_aggregator != None:
# Assign Poller to the Aggregtor with least assigned Pollers
message = self.parser.rpc_call(chosen_aggregator, 'add_poller', [str(unassigned_poller)])
self.sched.add_message(message)
for job in self.job_map[unassigned_poller]:
message = self.parser.rpc_call(chosen_aggregator, 'move_job', [str(unassigned_poller), job['id'], job['address'], job['protocol'], job['frequency'], job['interface'], job['resource'], job['segment']])
self.sched.add_message(message)
self.poller_map[chosen_aggregator].append((unassigned_poller, segment))
return True
else:
self.log.info('No aggregators available for poller assignment')
return False
""" Get Pollers for a given network segment """
def get_segment_pollers(self, segment):
segment_pollers = {}
for aggregator, pollers in self.poller_map.items():
for poller, poller_segment in pollers:
if poller_segment == segment:
segment_pollers[poller] = self.job_map[poller]
return segment_pollers
""" Called to allocate unassigned jobs """
def assign_pooled_jobs(self):
if len(self.job_map) > 0 and len(self.poller_map) > 0:
for job in self.job_pool:
unassigned_job = job
least_loaded = None
job_comp = None
pollers = self.get_segment_pollers(unassigned_job['segment'])
for poller, jobs in pollers.items():
# for poller, jobs in self.job_map.items():
if (least_loaded == None and job_comp == None) or len(jobs) < job_comp:
least_loaded = poller
job_comp = len(jobs)
if least_loaded != None:
chosen_aggregator = None
for aggregator, pollers in self.poller_map.items():
for poller, segment in pollers:
if poller == least_loaded:
chosen_aggregator = aggregator
break
if chosen_aggregator != None:
self.send_job(unassigned_job, least_loaded, chosen_aggregator)
else:
self.log.info('No assigned pollers available for job assignment')
#print 'Job map %s' % self.job_map
#print 'Job pool %s' % self.job_pool
""" Rebalance pollers, compares amount assigned to each Aggregator, and moves across to
another Poller if there's at least 2 more than another Aggregator """
def rebalance_pollers(self):
self.log.info('Attempting to rebalance pollers')
poller_comp = None
least_pollers = None
most_pollers = None
# Retrieve aggregators with least and most pollers
for aggregator, pollers in self.poller_map.items():
if poller_comp == None:
least_pollers = aggregator
most_pollers = aggregator
elif len(pollers) < poller_comp:
least_pollers = aggregator
elif len(pollers) > poller_comp:
most_pollers = aggregator
poller_comp = len(pollers)
if least_pollers != None and most_pollers != None:
# If the difference between the two pollers is worth balancing
if (len(self.poller_map[most_pollers]) - len(self.poller_map[least_pollers])) > 1:
poller, segment = self.poller_map[most_pollers].pop()
self.poller_map[least_pollers].append((poller, segment))
self.sched.add_message(self.parser.rpc_call(least_pollers, 'add_poller', [str(poller)]))
self.sched.add_message(self.parser.rpc_call(most_pollers, 'remove_poller', [str(poller)]))
self.rebalance_pollers()
else:
self.log.info('Pollers balanced')
return True
""" Similar to above, checks number of assigned jobs through the system, and will level them across all Pollers """
def rebalance_jobs(self):
self.log.info('Attempting to rebalance jobs')
job_comp = None
least_jobs = None
most_jobs = None
network_segment = 'skynet'
pollers = self.get_segment_pollers(network_segment)
# for poller, jobs in self.job_map.items():
for poller, jobs in pollers.items():
print poller
if job_comp == None:
least_jobs = poller
most_jobs = poller
elif len(jobs) < job_comp:
least_jobs = poller
elif len(jobs) > job_comp:
most_jobs = poller
job_comp = len(jobs)
if least_jobs != None and most_jobs != None:
if (len(self.job_map[most_jobs]) - len(self.job_map[least_jobs])) > 1:
job = self.job_map[most_jobs].pop()
self.job_map[least_jobs].append(job)
least_parent = None
most_parent = None
for aggregator, pollers in self.poller_map.items():
for poller, node_segment in pollers:
if network_segment == node_segment:
if poller == least_jobs:
least_parent = aggregator
if poller == most_jobs:
most_parent = aggregator
if least_parent != None and most_parent != None:
break
if least_parent != None and most_parent != None:
self.log.info('Moving job %s to %s' % (job['id'], least_jobs))
self.sched.add_message(self.parser.rpc_call(most_parent, 'remove_job', [job['id']]))
self.sched.add_message(self.parser.rpc_call(least_parent, 'run_job', [str(least_jobs), job['id'], job['address'], job['protocol'], job['frequency'], job['interface'], job['resource']]), offset=True)
self.rebalance_jobs()
else:
self.log.info('Jobs balanced')
return True
""" Retrieve jobs on startup """
def establish_jobs(self):
monitors = self.db.get_monitors()
self.log.info('Retrieving jobs')
for monitor in monitors:
jobs = self.db.get_jobs(monitor.name)
for job in jobs:
job = dict(job)
segment_name = self.db.get_segment_name(job['segment'])
job['segment'] = segment_name
# Make the poll freq stored every minute minimum
job['frequency'] = job['frequency'] * 60
self.job_pool.append(job)
self.log.info('%s jobs added to the pool' % len(self.job_pool))
""" Send job to Aggregator to forward to Poller """
def send_job(self, job, poller, aggregator):
message = self.parser.rpc_call(aggregator, 'run_job', [str(poller), job['id'], job['address'], job['protocol'], job['frequency'], job['interface'], job['resource']])
self.log.info('Sending job %s to %s' % (job['id'], aggregator))
self.sched.add_message(message, self.assign_job, offset=True)
def step_on(self):
try:
self.conn.Process(1)
except KeyboardInterrupt: return 0
return 1
def go_on(self):
while self.step_on(): pass
