class Monitor(threading.Thread):
"""
Thread responsible for monitoring EPG-to-Contract relations.
"""
def __init__(self, cdb):
threading.Thread.__init__(self)
self.cdb = cdb
self._monitor_frequency = 1
self._exit = False
self._relation_subscriptions = []
self._inheritance_tag_subscriptions = []
self._subnet_subscriptions = []
self._relations = RelationDB()
self._inheritance_tags = TagDB()
self._subnets = SubnetDB()
self._old_relations = {}
self.apic = None
def exit(self):
"""
Indicate that the thread should exit.
"""
self._exit = True
def subscribe(self, policy):
query_url = ''
epg = policy.epg
epg_data = (epg.tenant, epg.epg_container_name, epg.name)
if epg.epg_container_type == 'app':
query_url = '/api/mo/uni/tn-%s/ap-%s/epg-%s.json' % epg_data
elif epg.epg_container_type == 'l3out':
subnet_query_url = '/api/mo/uni/tn-%s/out-%s/instP-%s.json' % epg_data
subnet_query_url += '?query-target=subtree&target-subtree-class=l3extSubnet'
subnet_query_url += '&subscription=yes'
if subnet_query_url not in self._subnet_subscriptions:
self.apic.subscribe(subnet_query_url)
self._subnet_subscriptions.append(subnet_query_url)
query_url = '/api/mo/uni/tn-%s/out-%s/instP-%s.json' % epg_data
elif epg.epg_container_type == 'l2out':
query_url = '/api/mo/uni/tn-%s/l2out-%s/instP-%s.json' % epg_data
query_url += '?query-target=subtree&target-subtree-class=fvRsProv,fvRsCons,fvRsProtBy,fvRsConsIf'
query_url += '&subscription=yes'
if query_url not in self._relation_subscriptions:
self.apic.subscribe(query_url)
self._relation_subscriptions.append(query_url)
def connect_to_apic(self):
logging.debug('Connecting to APIC...')
# Connect to APIC
apic_config = self.cdb.get_apic_config()
url = apic_config.ip_address
if apic_config.use_https:
url = 'https://' + url
else:
url = 'http://' + url
if self.apic is not None:
logging.debug('APIC is previously connected')
self.apic = Session(url, apic_config.user_name, apic_config.password)
resp = self.apic.login()
# TODO: need to clear out the databases first
assert len(self._inheritance_tags.db) == 0
# Get all of the subnets
query_url = '/api/mo/uni.json?query-target=subtree&target-subtree-class=l3extSubnet'
subnets = self.apic.get(query_url)
for subnet in subnets.json()['imdata']:
subnet_event = SubnetEvent(subnet)
self._subnets.store_subnet_event(subnet_event)
# Get all of the inherited relations
tag_query_url = '/api/class/tagInst.json?query-target-filter=wcard(tagInst.name,"inherited:")'
tags = self.apic.get(tag_query_url)
for tag in tags.json()['imdata']:
tag_event = TagEvent(tag)
# Create a database entry for the inherited relations
self._inheritance_tags.store_tag(tag_event)
self._old_relations = self._inheritance_tags.get_relations()
# Get all of the relations. We need this to track relations that are already present
# i.e. configured but not through inheritance so that we can tell the difference
query_url = '/api/mo/uni.json?query-target=subtree&target-subtree-class=fvRsProv,fvRsCons,fvRsProtBy,fvRsConsIf'
relations = self.apic.get(query_url)
for relation in relations.json()['imdata']:
# Skip any in-band and out-of-band interfaces
if '/mgmtp-' in relation[relation.keys()[0]]['attributes']['dn']:
continue
self._relations.store_relation(RelationEvent(relation))
# Get all of the policies that are inherited from but not inheriting
parent_only_policies = []
for policy in self.cdb.get_inheritance_policies():
inherited_from = False
if policy.allowed and not policy.enabled:
for child_policy in self.cdb.get_inheritance_policies():
if child_policy.has_inherit_from(
) and child_policy.inherit_from == policy.epg:
inherited_from = True
if inherited_from:
parent_only_policies.append(policy)
# Issue all of the subscriptions
for policy in self.cdb.get_inheritance_policies():
self.subscribe(policy)
for parent_only_policy in parent_only_policies:
self.subscribe(parent_only_policy)
tag_query_url += '&subscription=yes'
self.apic.subscribe(tag_query_url)
self._inheritance_tag_subscriptions.append(tag_query_url)
def _does_tenant_have_contract(self,
tenant_name,
contract_name,
contract_type='brc'):
logging.debug('tenant: %s contract: %s contract_type: %s', tenant_name,
contract_name, contract_type)
query_url = '/api/mo/uni/tn-%s/%s-%s.json' % (
tenant_name, contract_type, contract_name)
resp = self.apic.get(query_url)
return resp.ok and int(resp.json()['totalCount']) > 0
def does_tenant_have_contract_if(self, tenant_name, contract_if_name):
return self._does_tenant_have_contract(tenant_name,
contract_if_name,
contract_type='cif')
def does_tenant_have_contract(self, tenant_name, contract_name):
return self._does_tenant_have_contract(tenant_name, contract_name)
def _add_inherited_relation(self, tenants, epg, relation, deleted=False):
tenant_found = False
# Find the tenant. Add if necessary
for tenant in tenants:
if tenant.name == epg.tenant:
tenant_found = True
break
if not tenant_found:
tenant = Tenant(epg.tenant)
tenants.append(tenant)
# Find the EPG Container. Add if necessary
if epg.is_l3out():
epg_container_class = OutsideL3
else:
epg_container_class = AppProfile
epg_containers = tenant.get_children(only_class=epg_container_class)
epg_container_found = False
for epg_container in epg_containers:
if epg_container.name == epg.epg_container_name:
epg_container_found = True
break
if not epg_container_found:
epg_container = epg_container_class(epg.epg_container_name, tenant)
# Find the EPG. Add if necessary
if epg.is_l3out():
epg_class = OutsideEPG
else:
epg_class = EPG
epgs = tenant.get_children(only_class=epg_class)
epg_found = False
for tenant_epg in epgs:
if tenant_epg.name == epg.name:
epg_found = True
break
if not epg_found:
tenant_epg = epg_class(epg.name, epg_container)
# Add the relation
(relation_type, relation_name) = relation
if relation_type == 'fvRsProv':
contract = Contract(relation_name, tenant)
tenant_epg.provide(contract)
if deleted:
tenant_epg.provide(contract)
tenant_epg.dont_provide(contract)
elif relation_type == 'fvRsCons':
contract = Contract(relation_name, tenant)
tenant_epg.consume(contract)
if deleted:
tenant_epg.consume(contract)
tenant_epg.dont_consume(contract)
elif relation_type == 'fvRsConsIf':
contract_interface = ContractInterface(relation_name, tenant)
tenant_epg.consume_cif(contract_interface)
if deleted:
tenant_epg.consume_cif(contract_interface)
tenant_epg.dont_consume_cif(contract_interface)
elif relation_type == 'fvRsProtBy':
taboo = Taboo(relation_name, tenant)
tenant_epg.protect(taboo)
if deleted:
tenant_epg.protect(taboo)
tenant_epg.dont_protect(taboo)
tenant_epg.add_tag('inherited:%s:%s' % (relation_type, relation_name))
if deleted:
tenant_epg.delete_tag('inherited:%s:%s' %
(relation_type, relation_name))
return tenants
def add_inherited_relation(self, tenants, epg, relation):
return self._add_inherited_relation(tenants, epg, relation)
def remove_inherited_relation(self, tenants, epg, relation):
return self._add_inherited_relation(tenants,
epg,
relation,
deleted=True)
def _calculate_relations_for_l3out_policy(self, inheritance_policy):
logging.debug('_calculate_relations_for_l3out_policy: %s',
inheritance_policy)
# Get all of the EPGs covering this policy's EPG's subnets
covering_epgs = self._subnets.get_all_covering_epgs(
inheritance_policy.epg)
# Remove any EPGs that are not allowed to be inherited
for covering_epg in covering_epgs:
if not self.cdb.is_inheritance_allowed(covering_epg):
covering_epgs.remove(covering_epg)
# Get all of the relations for the remaining covering EPGs
relations = []
for covering_epg in covering_epgs:
epg_relations = self._relations.get_relations_for_epg(covering_epg)
for epg_relation in epg_relations:
if epg_relation not in relations:
relations.append(epg_relation)
logging.debug('Relations to be inherited: %s', relations)
# Need to add any configured relations
configured_relations = self._relations.get_relations_for_epg(
inheritance_policy.epg)
for configured_relation in configured_relations:
if configured_relation not in relations:
logging.debug('Adding configured relation: %s',
configured_relation)
if not self._inheritance_tags.is_inherited(
inheritance_policy.epg, configured_relation):
relations.append(configured_relation)
return relations
def _calculate_relations_for_app_policy(self, inheritance_policy):
logging.debug('policy: %s', inheritance_policy)
relations = []
# Check if this policy is even inheritance enabled
if not inheritance_policy.has_inherit_from():
logging.warning('EPG is not inheriting from a parent EPG')
return relations
# Get the EPG that this policy is inheriting from
parent_epg = inheritance_policy.inherit_from
# Is inheritance allowed on that EPG ?
if not self.cdb.is_inheritance_allowed(parent_epg):
logging.warning('Parent EPG policy does not allow inheritance')
return relations
# Get the relations belonging to that EPG
return self._relations.get_relations_for_epg(parent_epg)
def calculate_relations(self):
relations = {}
for inheritance_policy in self.cdb.get_inheritance_policies():
if not inheritance_policy.enabled:
continue
if inheritance_policy.epg.is_l3out():
epg_relations = self._calculate_relations_for_l3out_policy(
inheritance_policy)
else:
# TODO: may eventually need to process l2out
epg_relations = self._calculate_relations_for_app_policy(
inheritance_policy)
relations[inheritance_policy.epg.get_json()] = epg_relations
return relations
def process_relation_event(self, event):
logging.debug('process_event EVENT: %s', event.event)
self._relations.store_relation(event)
def process_subnet_event(self, event):
logging.debug('Received subnet event: %s', event)
# Store the subnet in the SubnetDB
self._subnets.store_subnet_event(event)
def process_inheritance_tag_event(self, event):
logging.debug('Received subnet event: %s', event)
# Store the tag in the TagDB
self._inheritance_tags.store_tag(event)
def _process_events(self, old_relations):
while self.apic is None:
pass
if old_relations is None:
old_relations = self._inheritance_tags.get_relations()
# Check for any tag events
for subscription in self._inheritance_tag_subscriptions:
while self.apic.has_events(subscription):
event = TagEvent(
self.apic.get_event(subscription)['imdata'][0])
self.process_inheritance_tag_event(event)
# Check for relation events
for subscription in self._relation_subscriptions:
while self.apic.has_events(subscription):
event = RelationEvent(
self.apic.get_event(subscription)['imdata'][0])
self.process_relation_event(event)
# Check for subnet events
for subscription in self._subnet_subscriptions:
while self.apic.has_events(subscription):
event = SubnetEvent(
self.apic.get_event(subscription)['imdata'][0])
self.process_subnet_event(event)
# Calculate the new set of relations
new_relations = self.calculate_relations()
for old_epg in old_relations:
logging.debug(old_epg)
for new_epg in new_relations:
logging.debug(new_epg)
# Compare the old and the new relations for changes
tenants = []
for new_epg in new_relations:
if new_epg not in old_relations:
# New EPG, so we need to add all of the relations
for new_relation in new_relations[new_epg]:
if self._inheritance_tags.is_inherited(
EPGPolicy(json.loads(new_epg)), new_relation):
# If it's inherited, but we don't have the relation. We are likely coming up and not populated
# the old_relations yet
pass
# If just configured, we will have a relationDB entry. Otherwise, we need to inherit it
if self._relations.has_relation_for_epg(
EPGPolicy(json.loads(new_epg)), new_relation):
continue
tenants = self.add_inherited_relation(
tenants, EPGPolicy(json.loads(new_epg)), new_relation)
else:
# Handle any new added relations
for new_relation in new_relations[new_epg]:
if new_relation not in old_relations[new_epg]:
if self._relations.has_relation_for_epg(
EPGPolicy(json.loads(new_epg)), new_relation):
continue
tenants = self.add_inherited_relation(
tenants, EPGPolicy(json.loads(new_epg)),
new_relation)
# Handle any deleted relations
for old_relation in old_relations[new_epg]:
if old_relation not in new_relations[new_epg]:
if self._inheritance_tags.is_inherited(
EPGPolicy(json.loads(new_epg)), old_relation):
tenants = self.remove_inherited_relation(
tenants, EPGPolicy(json.loads(new_epg)),
old_relation)
else:
# Must have been configured and manually deleted
pass
for old_epg in old_relations:
if old_epg not in new_relations:
for old_relation in old_relations[old_epg]:
if self._inheritance_tags.is_inherited(
EPGPolicy(json.loads(old_epg)), old_relation):
tenants = self.remove_inherited_relation(
tenants, EPGPolicy(json.loads(old_epg)),
old_relation)
# Push the necessary config to the APIC
for tenant in tenants:
tenant_json = tenant.get_json()
# Check that the tenant actually has the contracts since they may actually be tenant common contracts.
# If tenant common is used, we need to clean up the tenant JSON to not create an empty contract within
# this tenant
for child in tenant_json['fvTenant']['children']:
if 'vzBrCP' in child:
if not self.does_tenant_have_contract(
tenant.name,
child['vzBrCP']['attributes']['name']):
tenant_json['fvTenant']['children'].remove(child)
elif 'vzCPIf' in child:
if not self.does_tenant_have_contract_if(
tenant.name,
child['vzCPIf']['attributes']['name']):
tenant_json['fvTenant']['children'].remove(child)
logging.debug('Pushing tenant configuration to the APIC: %s',
tenant_json)
resp = self.apic.push_to_apic(tenant.get_url(), tenant_json)
if resp.ok:
logging.debug('Pushed to APIC successfully')
else:
logging.error('Error pushing to APIC', resp.text)
return new_relations
def run(self):
loop_count = 0
accelerated_cleanup_done = False
while not self._exit:
time.sleep(self._monitor_frequency)
self._old_relations = self._process_events(self._old_relations)
except:
error("Error creating subscription for tenant '%s'" % tn.name)
# Also, subscribe to the Tenant class so we can create new subscriptions
# if new tenants get created.
tn_url = "/api/class/fvTenant.json?subscription=yes"
session.subscribe(tn_url, only_new=True)
# Now we loop forever, waiting for any events
output("Waiting for events...")
while(True):
# Check status of existing tenants
for url in urls:
if session.has_events(url):
event_data = session.get_event(url)
do_something(event_data)
# Check for new tenants (if any tenants get added, we create a new
# subscription; if they get deleted, we remove the existing one).
if session.has_events(tn_url):
tn = session.get_event(tn_url)
tn_dn = tn['imdata'][0]['fvTenant']['attributes']['dn']
url = "/api/mo/%s.json?query-target=subtree&subscription=yes" % tn_dn
if tn['imdata'][0]['fvTenant']['attributes']['status']=="created":
debug("Subscribing to '%s'" % url)
session.subscribe(url, only_new=True)
urls.append(url)
elif tn['imdata'][0]['fvTenant']['attributes']['status']=="deleted":
debug("Unsubscribing from '%s'" % url)
session.unsubscribe(url)
class Monitor(threading.Thread):
"""
Thread responsible for monitoring EPG-to-Contract relations.
"""
def __init__(self, cdb):
threading.Thread.__init__(self)
self.cdb = cdb
self._monitor_frequency = 1
self._exit = False
self._relation_subscriptions = []
self._inheritance_tag_subscriptions = []
self._subnet_subscriptions = []
self._relations = RelationDB()
self._inheritance_tags = TagDB()
self._subnets = SubnetDB()
self._old_relations = {}
self.apic = None
def exit(self):
"""
Indicate that the thread should exit.
"""
self._exit = True
def subscribe(self, policy):
query_url = ""
epg = policy.epg
epg_data = (epg.tenant, epg.epg_container_name, epg.name)
if epg.epg_container_type == "app":
query_url = "/api/mo/uni/tn-%s/ap-%s/epg-%s.json" % epg_data
elif epg.epg_container_type == "l3out":
subnet_query_url = "/api/mo/uni/tn-%s/out-%s/instP-%s.json" % epg_data
subnet_query_url += "?query-target=subtree&target-subtree-class=l3extSubnet"
subnet_query_url += "&subscription=yes"
if subnet_query_url not in self._subnet_subscriptions:
self.apic.subscribe(subnet_query_url)
self._subnet_subscriptions.append(subnet_query_url)
query_url = "/api/mo/uni/tn-%s/out-%s/instP-%s.json" % epg_data
elif epg.epg_container_type == "l2out":
query_url = "/api/mo/uni/tn-%s/l2out-%s/instP-%s.json" % epg_data
query_url += "?query-target=subtree&target-subtree-class=fvRsProv,fvRsCons,fvRsProtBy,fvRsConsIf"
query_url += "&subscription=yes"
if query_url not in self._relation_subscriptions:
self.apic.subscribe(query_url)
self._relation_subscriptions.append(query_url)
def connect_to_apic(self):
logging.debug("Connecting to APIC...")
# Connect to APIC
apic_config = self.cdb.get_apic_config()
url = apic_config.ip_address
if apic_config.use_https:
url = "https://" + url
else:
url = "http://" + url
if self.apic is not None:
logging.debug("APIC is previously connected")
self.apic = Session(url, apic_config.user_name, apic_config.password)
resp = self.apic.login()
# TODO: need to clear out the databases first
assert len(self._inheritance_tags.db) == 0
# Get all of the subnets
query_url = "/api/mo/uni.json?query-target=subtree&target-subtree-class=l3extSubnet"
subnets = self.apic.get(query_url)
for subnet in subnets.json()["imdata"]:
subnet_event = SubnetEvent(subnet)
self._subnets.store_subnet_event(subnet_event)
# Get all of the inherited relations
tag_query_url = '/api/class/tagInst.json?query-target-filter=wcard(tagInst.name,"inherited:")'
tags = self.apic.get(tag_query_url)
for tag in tags.json()["imdata"]:
tag_event = TagEvent(tag)
# Create a database entry for the inherited relations
self._inheritance_tags.store_tag(tag_event)
self._old_relations = self._inheritance_tags.get_relations()
# Get all of the relations. We need this to track relations that are already present
# i.e. configured but not through inheritance so that we can tell the difference
query_url = "/api/mo/uni.json?query-target=subtree&target-subtree-class=fvRsProv,fvRsCons,fvRsProtBy,fvRsConsIf"
relations = self.apic.get(query_url)
for relation in relations.json()["imdata"]:
# Skip any in-band and out-of-band interfaces
if "/mgmtp-" in relation[relation.keys()[0]]["attributes"]["dn"]:
continue
self._relations.store_relation(RelationEvent(relation))
# Get all of the policies that are inherited from but not inheriting
parent_only_policies = []
for policy in self.cdb.get_inheritance_policies():
inherited_from = False
if policy.allowed and not policy.enabled:
for child_policy in self.cdb.get_inheritance_policies():
if child_policy.has_inherit_from() and child_policy.inherit_from == policy.epg:
inherited_from = True
if inherited_from:
parent_only_policies.append(policy)
# Issue all of the subscriptions
for policy in self.cdb.get_inheritance_policies():
self.subscribe(policy)
for parent_only_policy in parent_only_policies:
self.subscribe(parent_only_policy)
tag_query_url += "&subscription=yes"
self.apic.subscribe(tag_query_url)
self._inheritance_tag_subscriptions.append(tag_query_url)
def _does_tenant_have_contract(self, tenant_name, contract_name, contract_type="brc"):
logging.debug("tenant: %s contract: %s contract_type: %s", tenant_name, contract_name, contract_type)
query_url = "/api/mo/uni/tn-%s/%s-%s.json" % (tenant_name, contract_type, contract_name)
resp = self.apic.get(query_url)
return resp.ok and int(resp.json()["totalCount"]) > 0
def does_tenant_have_contract_if(self, tenant_name, contract_if_name):
return self._does_tenant_have_contract(tenant_name, contract_if_name, contract_type="cif")
def does_tenant_have_contract(self, tenant_name, contract_name):
return self._does_tenant_have_contract(tenant_name, contract_name)
def _add_inherited_relation(self, tenants, epg, relation, deleted=False):
tenant_found = False
# Find the tenant. Add if necessary
for tenant in tenants:
if tenant.name == epg.tenant:
tenant_found = True
break
if not tenant_found:
tenant = Tenant(epg.tenant)
tenants.append(tenant)
# Find the EPG Container. Add if necessary
if epg.is_l3out():
epg_container_class = OutsideL3
else:
epg_container_class = AppProfile
epg_containers = tenant.get_children(only_class=epg_container_class)
epg_container_found = False
for epg_container in epg_containers:
if epg_container.name == epg.epg_container_name:
epg_container_found = True
break
if not epg_container_found:
epg_container = epg_container_class(epg.epg_container_name, tenant)
# Find the EPG. Add if necessary
if epg.is_l3out():
epg_class = OutsideEPG
else:
epg_class = EPG
epgs = tenant.get_children(only_class=epg_class)
epg_found = False
for tenant_epg in epgs:
if tenant_epg.name == epg.name:
epg_found = True
break
if not epg_found:
tenant_epg = epg_class(epg.name, epg_container)
# Add the relation
(relation_type, relation_name) = relation
if relation_type == "fvRsProv":
contract = Contract(relation_name, tenant)
tenant_epg.provide(contract)
if deleted:
tenant_epg.provide(contract)
tenant_epg.dont_provide(contract)
elif relation_type == "fvRsCons":
contract = Contract(relation_name, tenant)
tenant_epg.consume(contract)
if deleted:
tenant_epg.consume(contract)
tenant_epg.dont_consume(contract)
elif relation_type == "fvRsConsIf":
contract_interface = ContractInterface(relation_name, tenant)
tenant_epg.consume_cif(contract_interface)
if deleted:
tenant_epg.consume_cif(contract_interface)
tenant_epg.dont_consume_cif(contract_interface)
elif relation_type == "fvRsProtBy":
taboo = Taboo(relation_name, tenant)
tenant_epg.protect(taboo)
if deleted:
tenant_epg.protect(taboo)
tenant_epg.dont_protect(taboo)
tenant_epg.add_tag("inherited:%s:%s" % (relation_type, relation_name))
if deleted:
tenant_epg.delete_tag("inherited:%s:%s" % (relation_type, relation_name))
return tenants
def add_inherited_relation(self, tenants, epg, relation):
return self._add_inherited_relation(tenants, epg, relation)
def remove_inherited_relation(self, tenants, epg, relation):
return self._add_inherited_relation(tenants, epg, relation, deleted=True)
def _calculate_relations_for_l3out_policy(self, inheritance_policy):
logging.debug("_calculate_relations_for_l3out_policy: %s", inheritance_policy)
# Get all of the EPGs covering this policy's EPG's subnets
covering_epgs = self._subnets.get_all_covering_epgs(inheritance_policy.epg)
# Remove any EPGs that are not allowed to be inherited
for covering_epg in covering_epgs:
if not self.cdb.is_inheritance_allowed(covering_epg):
covering_epgs.remove(covering_epg)
# Get all of the relations for the remaining covering EPGs
relations = []
for covering_epg in covering_epgs:
epg_relations = self._relations.get_relations_for_epg(covering_epg)
for epg_relation in epg_relations:
if epg_relation not in relations:
relations.append(epg_relation)
logging.debug("Relations to be inherited: %s", relations)
# Need to add any configured relations
configured_relations = self._relations.get_relations_for_epg(inheritance_policy.epg)
for configured_relation in configured_relations:
if configured_relation not in relations:
logging.debug("Adding configured relation: %s", configured_relation)
if not self._inheritance_tags.is_inherited(inheritance_policy.epg, configured_relation):
relations.append(configured_relation)
return relations
def _calculate_relations_for_app_policy(self, inheritance_policy):
logging.debug("policy: %s", inheritance_policy)
relations = []
# Check if this policy is even inheritance enabled
if not inheritance_policy.has_inherit_from():
logging.warning("EPG is not inheriting from a parent EPG")
return relations
# Get the EPG that this policy is inheriting from
parent_epg = inheritance_policy.inherit_from
# Is inheritance allowed on that EPG ?
if not self.cdb.is_inheritance_allowed(parent_epg):
logging.warning("Parent EPG policy does not allow inheritance")
return relations
# Get the relations belonging to that EPG
return self._relations.get_relations_for_epg(parent_epg)
def calculate_relations(self):
relations = {}
for inheritance_policy in self.cdb.get_inheritance_policies():
if not inheritance_policy.enabled:
continue
if inheritance_policy.epg.is_l3out():
epg_relations = self._calculate_relations_for_l3out_policy(inheritance_policy)
else:
# TODO: may eventually need to process l2out
epg_relations = self._calculate_relations_for_app_policy(inheritance_policy)
relations[inheritance_policy.epg.get_json()] = epg_relations
return relations
def process_relation_event(self, event):
logging.debug("process_event EVENT: %s", event.event)
self._relations.store_relation(event)
def process_subnet_event(self, event):
logging.debug("Received subnet event: %s", event)
# Store the subnet in the SubnetDB
self._subnets.store_subnet_event(event)
def process_inheritance_tag_event(self, event):
logging.debug("Received subnet event: %s", event)
# Store the tag in the TagDB
self._inheritance_tags.store_tag(event)
def _process_events(self, old_relations):
while self.apic is None:
pass
if old_relations is None:
old_relations = self._inheritance_tags.get_relations()
# Check for any tag events
for subscription in self._inheritance_tag_subscriptions:
while self.apic.has_events(subscription):
event = TagEvent(self.apic.get_event(subscription)["imdata"][0])
self.process_inheritance_tag_event(event)
# Check for relation events
for subscription in self._relation_subscriptions:
while self.apic.has_events(subscription):
event = RelationEvent(self.apic.get_event(subscription)["imdata"][0])
self.process_relation_event(event)
# Check for subnet events
for subscription in self._subnet_subscriptions:
while self.apic.has_events(subscription):
event = SubnetEvent(self.apic.get_event(subscription)["imdata"][0])
self.process_subnet_event(event)
# Calculate the new set of relations
new_relations = self.calculate_relations()
for old_epg in old_relations:
logging.debug(old_epg)
for new_epg in new_relations:
logging.debug(new_epg)
# Compare the old and the new relations for changes
tenants = []
for new_epg in new_relations:
if new_epg not in old_relations:
# New EPG, so we need to add all of the relations
for new_relation in new_relations[new_epg]:
if self._inheritance_tags.is_inherited(EPGPolicy(json.loads(new_epg)), new_relation):
# If it's inherited, but we don't have the relation. We are likely coming up and not populated
# the old_relations yet
pass
# If just configured, we will have a relationDB entry. Otherwise, we need to inherit it
if self._relations.has_relation_for_epg(EPGPolicy(json.loads(new_epg)), new_relation):
continue
tenants = self.add_inherited_relation(tenants, EPGPolicy(json.loads(new_epg)), new_relation)
else:
# Handle any new added relations
for new_relation in new_relations[new_epg]:
if new_relation not in old_relations[new_epg]:
if self._relations.has_relation_for_epg(EPGPolicy(json.loads(new_epg)), new_relation):
continue
tenants = self.add_inherited_relation(tenants, EPGPolicy(json.loads(new_epg)), new_relation)
# Handle any deleted relations
for old_relation in old_relations[new_epg]:
if old_relation not in new_relations[new_epg]:
if self._inheritance_tags.is_inherited(EPGPolicy(json.loads(new_epg)), old_relation):
tenants = self.remove_inherited_relation(
tenants, EPGPolicy(json.loads(new_epg)), old_relation
)
else:
# Must have been configured and manually deleted
pass
for old_epg in old_relations:
if old_epg not in new_relations:
for old_relation in old_relations[old_epg]:
if self._inheritance_tags.is_inherited(EPGPolicy(json.loads(old_epg)), old_relation):
tenants = self.remove_inherited_relation(tenants, EPGPolicy(json.loads(old_epg)), old_relation)
# Push the necessary config to the APIC
for tenant in tenants:
tenant_json = tenant.get_json()
# Check that the tenant actually has the contracts since they may actually be tenant common contracts.
# If tenant common is used, we need to clean up the tenant JSON to not create an empty contract within
# this tenant
for child in tenant_json["fvTenant"]["children"]:
if "vzBrCP" in child:
if not self.does_tenant_have_contract(tenant.name, child["vzBrCP"]["attributes"]["name"]):
tenant_json["fvTenant"]["children"].remove(child)
elif "vzCPIf" in child:
if not self.does_tenant_have_contract_if(tenant.name, child["vzCPIf"]["attributes"]["name"]):
tenant_json["fvTenant"]["children"].remove(child)
logging.debug("Pushing tenant configuration to the APIC: %s", tenant_json)
resp = self.apic.push_to_apic(tenant.get_url(), tenant_json)
if resp.ok:
logging.debug("Pushed to APIC successfully")
else:
logging.error("Error pushing to APIC", resp.text)
return new_relations
def run(self):
loop_count = 0
accelerated_cleanup_done = False
while not self._exit:
time.sleep(self._monitor_frequency)
self._old_relations = self._process_events(self._old_relations)
class Monitor(threading.Thread):
"""
Thread responsible for monitoring EPG-to-Contract relations.
"""
def __init__(self, cdb):
threading.Thread.__init__(self)
self.cdb = cdb
self._monitor_frequency = 1
self._exit = False
self._relation_subscriptions = []
self._inheritance_tag_subscriptions = []
self._subnet_subscriptions = []
self._relations = RelationDB()
self._inheritance_tags = TagDB()
self._subnets = SubnetDB()
self.apic = None
def exit(self):
"""
Indicate that the thread should exit.
"""
self._exit = True
def subscribe(self, policy):
query_url = ''
epg = policy.epg
epg_data = (epg.tenant, epg.epg_container_name, epg.name)
if epg.epg_container_type == 'app':
query_url = '/api/mo/uni/tn-%s/ap-%s/epg-%s.json' % epg_data
elif epg.epg_container_type == 'l3out':
subnet_query_url = '/api/mo/uni/tn-%s/out-%s/instP-%s.json' % epg_data
subnet_query_url += '?query-target=subtree&target-subtree-class=l3extSubnet'
subnet_query_url += '&subscription=yes'
if subnet_query_url not in self._subnet_subscriptions:
self.apic.subscribe(subnet_query_url)
self._subnet_subscriptions.append(subnet_query_url)
query_url = '/api/mo/uni/tn-%s/out-%s/instP-%s.json' % epg_data
elif epg.epg_container_type == 'l2out':
query_url = '/api/mo/uni/tn-%s/l2out-%s/instP-%s.json' % epg_data
query_url += '?query-target=subtree&target-subtree-class=fvRsProv,fvRsCons,fvRsProtBy,fvRsConsIf'
query_url += '&subscription=yes'
if query_url not in self._relation_subscriptions:
self.apic.subscribe(query_url)
self._relation_subscriptions.append(query_url)
def connect_to_apic(self):
logging.debug('Connecting to APIC...')
# Connect to APIC
apic_config = self.cdb.get_apic_config()
url = apic_config.ip_address
if apic_config.use_https:
url = 'https://' + url
else:
url = 'http://' + url
if self.apic is not None:
logging.debug('APIC is previously connected')
self.apic = Session(url, apic_config.user_name, apic_config.password)
resp = self.apic.login()
# TODO: need to clear out the databases first
# Get all of the subnets
query_url = '/api/mo/uni.json?query-target=subtree&target-subtree-class=l3extSubnet'
subnets = self.apic.get(query_url)
for subnet in subnets.json()['imdata']:
subnet_event = SubnetEvent(subnet)
self._subnets.store_subnet_event(subnet_event)
# Get all of the inherited relations
tag_query_url = '/api/class/tagInst.json?query-target-filter=wcard(tagInst.name,"inherited:")'
tags = self.apic.get(tag_query_url)
for tag in tags.json()['imdata']:
tag_event = TagEvent(tag)
# Create a database entry for the inherited relations
self._inheritance_tags.store_tag(tag_event)
# Get all of the relations. We need this to track relations that are already present
# i.e. configured but not through inheritance so that we can tell the difference
query_url = '/api/mo/uni.json?query-target=subtree&target-subtree-class=fvRsProv,fvRsCons,fvRsProtBy,fvRsConsIf'
relations = self.apic.get(query_url)
for relation in relations.json()['imdata']:
self._relations.store_relation(RelationEvent(relation))
# Get all of the policies that are inherited from but not inheriting
parent_only_policies = []
for policy in self.cdb.get_inheritance_policies():
inherited_from = False
if policy.allowed and not policy.enabled:
for child_policy in self.cdb.get_inheritance_policies():
if child_policy.has_inherit_from() and child_policy.inherit_from == policy.epg:
inherited_from = True
if inherited_from:
parent_only_policies.append(policy)
# Issue all of the subscriptions
for policy in self.cdb.get_inheritance_policies():
self.subscribe(policy)
for parent_only_policy in parent_only_policies:
self.subscribe(parent_only_policy)
tag_query_url += '&subscription=yes'
self.apic.subscribe(tag_query_url)
self._inheritance_tag_subscriptions.append(tag_query_url)
def _add_inherited_relation(self, tenants, epg, relation, deleted=False):
tenant_found = False
# Find the tenant. Add if necessary
for tenant in tenants:
if tenant.name == epg.tenant:
tenant_found = True
break
if not tenant_found:
tenant = Tenant(epg.tenant)
tenants.append(tenant)
# Find the EPG Container. Add if necessary
if epg.is_l3out:
epg_container_class = OutsideL3
else:
epg_container_class = AppProfile
epg_containers = tenant.get_children(only_class=epg_container_class)
epg_container_found = False
for epg_container in epg_containers:
if epg_container.name == epg.epg_container_name:
epg_container_found = True
break
if not epg_container_found:
epg_container = epg_container_class(epg.epg_container_name, tenant)
# Find the EPG. Add if necessary
if epg.is_l3out:
epg_class = OutsideEPG
else:
epg_class = EPG
epgs = tenant.get_children(only_class=epg_class)
epg_found = False
for tenant_epg in epgs:
if tenant_epg.name == epg.name:
epg_found = True
break
if not epg_found:
tenant_epg = epg_class(epg.name, epg_container)
# Add the relation
(relation_type, relation_name) = relation
if relation_type == 'fvRsProv':
contract = Contract(relation_name, tenant)
tenant_epg.provide(contract)
if deleted:
tenant_epg.provide(contract)
tenant_epg.dont_provide(contract)
elif relation_type == 'fvRsCons':
contract = Contract(relation_name, tenant)
tenant_epg.consume(contract)
if deleted:
tenant_epg.consume(contract)
tenant_epg.dont_consume(contract)
elif relation_type == 'fvRsConsIf':
contract_interface = ContractInterface(relation_name, tenant)
tenant_epg.consume_cif(contract_interface)
if deleted:
tenant_epg.consume_cif(contract_interface)
tenant_epg.dont_consume_cif(contract_interface)
elif relation_type == 'fvRsProtBy':
taboo = Taboo(relation_name, tenant)
tenant_epg.protect(taboo)
if deleted:
tenant_epg.protect(taboo)
tenant_epg.dont_protect(taboo)
tenant_epg.add_tag('inherited:%s:%s' % (relation_type, relation_name))
if deleted:
tenant_epg.delete_tag('inherited:%s:%s' % (relation_type, relation_name))
return tenants
def add_inherited_relation(self, tenants, epg, relation):
return self._add_inherited_relation(tenants, epg, relation)
def remove_inherited_relation(self, tenants, epg, relation):
return self._add_inherited_relation(tenants, epg, relation, deleted=True)
def _calculate_relations_for_l3out_policy(self, inheritance_policy):
logging.debug('_calculate_relations_for_l3out_policy: %s', inheritance_policy)
# Get all of the EPGs covering this policy's EPG's subnets
covering_epgs = self._subnets.get_all_covering_epgs(inheritance_policy.epg)
# Remove any EPGs that are not allowed to be inherited
for covering_epg in covering_epgs:
if not self.cdb.is_inheritance_allowed(covering_epg):
covering_epgs.remove(covering_epg)
# Get all of the relations for the remaining covering EPGs
relations = []
for covering_epg in covering_epgs:
epg_relations = self._relations.get_relations_for_epg(covering_epg)
for epg_relation in epg_relations:
if epg_relation not in relations:
relations.append(epg_relation)
logging.debug('Relations to be inherited: %s', relations)
# Need to add any configured relations
configured_relations = self._relations.get_relations_for_epg(inheritance_policy.epg)
for configured_relation in configured_relations:
if configured_relation not in relations:
logging.debug('Adding configured relation: %s', configured_relation)
if not self._inheritance_tags.is_inherited(inheritance_policy.epg, configured_relation):
relations.append(configured_relation)
return relations
def _calculate_relations_for_app_policy(self, inheritance_policy):
pass
def calculate_relations(self):
relations = {}
for inheritance_policy in self.cdb.get_inheritance_policies():
if not inheritance_policy.enabled:
continue
if inheritance_policy.epg.is_l3out():
epg_relations = self._calculate_relations_for_l3out_policy(inheritance_policy)
else:
# TODO: may eventually need to process l2out
self._calculate_relations_for_app_policy(inheritance_policy)
relations[inheritance_policy.epg.get_json()] = epg_relations
return relations
def process_relation_event(self, event):
logging.debug('process_event EVENT: %s', event.event)
self._relations.store_relation(event)
def process_subnet_event(self, event):
logging.debug('Received subnet event: %s', event)
# Store the subnet in the SubnetDB
self._subnets.store_subnet_event(event)
def process_inheritance_tag_event(self, event):
logging.debug('Received subnet event: %s', event)
# Store the tag in the TagDB
self._inheritance_tags.store_tag(event)
def _process_events(self, old_relations):
while self.apic is None:
pass
# Check for any tag events
for subscription in self._inheritance_tag_subscriptions:
while self.apic.has_events(subscription):
event = TagEvent(self.apic.get_event(subscription)['imdata'][0])
self.process_inheritance_tag_event(event)
# Check for relation events
for subscription in self._relation_subscriptions:
while self.apic.has_events(subscription):
event = RelationEvent(self.apic.get_event(subscription)['imdata'][0])
self.process_relation_event(event)
# Check for subnet events
for subscription in self._subnet_subscriptions:
while self.apic.has_events(subscription):
event = SubnetEvent(self.apic.get_event(subscription)['imdata'][0])
self.process_subnet_event(event)
# Calculate the new set of relations
new_relations = self.calculate_relations()
logging.debug('OLD_RELATIONS: %s %s', len(old_relations), old_relations)
for old_epg in old_relations:
logging.debug(old_epg)
logging.debug('NEW_RELATIONS: %s %s', len(new_relations), new_relations)
for new_epg in new_relations:
logging.debug(new_epg)
# Compare the old and the new relations for changes
tenants = []
for new_epg in new_relations:
if new_epg not in old_relations:
# New EPG, so we need to add all of the relations
for new_relation in new_relations[new_epg]:
if self._inheritance_tags.is_inherited(EPGPolicy(json.loads(new_epg)), new_relation):
# If it's inherited, but we don't have the relation. We are likely coming up and not populated
# the old_relations yet
#continue
pass
# If just configured, we will have a relationDB entry. Otherwise, we need to inherit it
if self._relations.has_relation_for_epg(EPGPolicy(json.loads(new_epg)), new_relation):
continue
tenants = self.add_inherited_relation(tenants, EPGPolicy(json.loads(new_epg)), new_relation)
else:
# Handle any new added relations
for new_relation in new_relations[new_epg]:
if new_relation not in old_relations[new_epg]:
if self._relations.has_relation_for_epg(EPGPolicy(json.loads(new_epg)), new_relation):
continue
tenants = self.add_inherited_relation(tenants, EPGPolicy(json.loads(new_epg)), new_relation)
# Handle any deleted relations
for old_relation in old_relations[new_epg]:
if old_relation not in new_relations[new_epg]:
if self._inheritance_tags.is_inherited(EPGPolicy(json.loads(new_epg)), old_relation):
tenants = self.remove_inherited_relation(tenants, EPGPolicy(json.loads(new_epg)), old_relation)
else:
# Must have been configured and manually deleted
pass
for old_epg in old_relations:
if old_epg not in new_relations:
for old_relation in old_relations[old_epg]:
if self._inheritance_tags.is_inherited(EPGPolicy(json.loads(old_epg)), old_relation):
tenants = self.remove_inherited_relation(tenants, EPGPolicy(json.loads(old_epg)), old_relation)
# Push the necessary config to the APIC
for tenant in tenants:
resp = tenant.push_to_apic(self.apic)
if resp.ok:
logging.debug('Pushed to APIC successfully')
else:
logging.error('Error pushing to APIC', resp.text)
return new_relations
def run(self):
loop_count = 0
accelerated_cleanup_done = False
old_relations = {}
while not self._exit:
time.sleep(self._monitor_frequency)
old_relations = self._process_events(old_relations)
except:
error("Error creating subscription for tenant '%s'" % tn.name)
# Also, subscribe to the Tenant class so we can create new subscriptions
# if new tenants get created.
tn_url = "/api/class/fvTenant.json?subscription=yes"
session.subscribe(tn_url, only_new=True)
# Now we loop forever, waiting for any events
output("Waiting for events...")
while (True):
# Check status of existing tenants
for url in urls:
if session.has_events(url):
event_data = session.get_event(url)
do_something(event_data)
# Check for new tenants (if any tenants get added, we create a new
# subscription; if they get deleted, we remove the existing one).
if session.has_events(tn_url):
tn = session.get_event(tn_url)
tn_dn = tn['imdata'][0]['fvTenant']['attributes']['dn']
url = "/api/mo/%s.json?query-target=subtree&subscription=yes" % tn_dn
if tn['imdata'][0]['fvTenant']['attributes'][
'status'] == "created":
debug("Subscribing to '%s'" % url)
session.subscribe(url, only_new=True)
urls.append(url)
elif tn['imdata'][0]['fvTenant']['attributes'][
'status'] == "deleted":
