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vnc_endpoints.py
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vnc_endpoints.py
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#
# Copyright (c) 2017 Juniper Networks, Inc. All rights reserved.
#
"""
VNC endpoints management for kubernetes
"""
import uuid
from vnc_api.vnc_api import *
from config_db import *
from cfgm_common import importutils
class VncEndpoints(object):
def __init__(self, vnc_lib=None, logger=None, kube=None):
self._name = type(self).__name__
self._vnc_lib = vnc_lib
self.logger = logger
self._kube = kube
self.service_lb_pool_mgr = importutils.import_object(
'kube_manager.vnc.loadbalancer.ServiceLbPoolManager', vnc_lib, logger)
self.service_lb_member_mgr = importutils.import_object(
'kube_manager.vnc.loadbalancer.ServiceLbMemberManager', vnc_lib, logger)
def _vnc_create_member(self, pool, pod_id, vmi_id, protocol_port):
pool_obj = self.service_lb_pool_mgr.read(pool.uuid)
address = None
annotations = {}
annotations['vmi'] = vmi_id
annotations['vm'] = pod_id
member_obj = self.service_lb_member_mgr.create(pool_obj,
address, protocol_port, annotations)
return member_obj
def _is_service_exists(self, service_name, service_namespace):
name = 'service' + '-' + service_name
lb_fq_name = ['default-domain', service_namespace, name]
try:
lb_obj = self._vnc_lib.loadbalancer_read(fq_name=lb_fq_name)
except NoIdError:
return False, None
if lb_obj is None:
return False, None
else:
return True, lb_obj.uuid
def _add_pod_to_service(self, service_id, pod_id, port=None):
lb = LoadbalancerKM.get(service_id)
if not lb:
return
listener_found = True
for ll_id in list(lb.loadbalancer_listeners):
ll = LoadbalancerListenerKM.get(ll_id)
if not ll:
continue
if not ll.params['protocol_port']:
continue
if port:
if ll.params['protocol_port'] != port['port'] or \
ll.params['protocol'] != port['protocol']:
listener_found = False
if not listener_found:
continue
pool_id = ll.loadbalancer_pool
if not pool_id:
continue
pool = LoadbalancerPoolKM.get(pool_id)
if not pool:
continue
vm = VirtualMachineKM.get(pod_id)
if not vm:
continue
for vmi_id in list(vm.virtual_machine_interfaces):
vmi = VirtualMachineInterfaceKM.get(vmi_id)
if not vmi:
continue
member_match = False
for member_id in pool.members:
member = LoadbalancerMemberKM.get(member_id)
if member and member.vmi == vmi_id:
member_match = True
break
if not member_match:
if isinstance(ll.target_port, basestring):
target_port = ll.params['protocol_port']
else:
target_port = ll.target_port
self.logger.debug("Create LB member for Pod: %s in LB: %s with target-port: %s"
% (vm.fq_name, lb.name, target_port))
member_obj = self._vnc_create_member(pool, pod_id, vmi_id,
target_port)
LoadbalancerMemberKM.locate(member_obj.uuid)
def _remove_pod_from_service(self, service_id, pod_id, port=None):
lb = LoadbalancerKM.get(service_id)
if not lb:
return
listener_found = True
for ll_id in list(lb.loadbalancer_listeners):
ll = LoadbalancerListenerKM.get(ll_id)
if not ll:
continue
if not ll.params['protocol_port']:
continue
if port:
if ll.params['protocol_port'] != port['port'] or \
ll.params['protocol'] != port['protocol']:
listener_found = False
if not listener_found:
continue
pool_id = ll.loadbalancer_pool
if not pool_id:
continue
pool = LoadbalancerPoolKM.get(pool_id)
if not pool:
continue
member_match = False
for member_id in pool.members:
member = LoadbalancerMemberKM.get(member_id)
if member and member.vm == pod_id:
member_match = True
break
if member_match:
self.logger.debug("Delete LB member for Pod: %s from LB: %s"
% (pod_id, lb.name))
self.service_lb_member_mgr.delete(member_id)
LoadbalancerMemberKM.delete(member.uuid)
def _get_pod_members_from_service_lb(self, service_id):
pod_members = set()
lb = LoadbalancerKM.get(service_id)
if not lb:
return pod_members
# No listeners on LB. Error condition. Handle gracefully..
if len(lb.loadbalancer_listeners) == 0:
self.logger.warning("No listeners on LB (" + lb.name + ")")
return pod_members
for ll_id in list(lb.loadbalancer_listeners):
ll = LoadbalancerListenerKM.get(ll_id)
if not ll:
continue
pool_id = ll.loadbalancer_pool
if not pool_id:
continue
pool = LoadbalancerPoolKM.get(pool_id)
if not pool:
continue
for member_id in pool.members:
member = LoadbalancerMemberKM.get(member_id)
if member.vm:
pod_members.add(member.vm)
return pod_members
def _get_service_pod_list(self, event):
pods_in_event = set()
subsets = event['object']['subsets']
for subset in subsets:
endpoints = subset['addresses']
for endpoint in endpoints:
pod = endpoint.get('targetRef')
if pod and pod.get('uid'):
pods_in_event.add(pod.get('uid'))
return pods_in_event
def vnc_endpoint_add(self, uid, name, namespace, event):
# Does service exists in contrail-api server,
# If No, create Service and then continue.
exists, service_id = self._is_service_exists(name, namespace)
if exists == False:
self.logger.warning("Add/Modify endpoint event when service "
+ name + " not existing");
return
# Get list of Pods attached to the Service.
prev_pod_ids = self._get_pod_members_from_service_lb(service_id)
#Get curr list of Pods matching Service Selector as listed
# in 'event' elements.
cur_pod_ids = self._get_service_pod_list(event)
# Compare. If Pod present in both lists, do nothing
# If Pod present only in cur_pod list, add 'Pod' to 'Service'
add_pod_members = cur_pod_ids.difference(prev_pod_ids)
for pod_id in add_pod_members:
self._add_pod_to_service(service_id, pod_id)
# If Pod present only in prev_pod list , delete 'Pod' from 'Service'
del_pod_members = prev_pod_ids.difference(cur_pod_ids)
for pod_id in del_pod_members:
self._remove_pod_from_service(service_id, pod_id)
def vnc_endpoint_delete(self, uid, name, namespace):
# Does service exists in contrail-api server,
# If No, create Service and then continue.
exists, service_id = self._is_service_exists(name, namespace)
if exists is False:
self.logger.warning("Delete endpoint event when service "
+ name + " doesn't exist.. ignore endpoint delete");
return
# Get list of Pods attached to the Service.
prev_pod_ids = self._get_pod_members_from_service_lb(service_id)
#Get curr list of Pods matching Service Selector as listed
# in 'event' elements.
cur_pod_ids = self._get_pod_list(event)
# Compare 2 lists. Should be same.. any diff is a sign of warning
pod_diff = set(prev_pod_ids) - set(cur_pod_ids)
# loadbalancer members source of truth. Delete them'all
for pod_id in prev_pod_ids:
remove_pod_from_service(service_id, pod_id)
def process(self, event):
event_type = event['type']
kind = event['object'].get('kind')
uid = event['object']['metadata'].get('uid')
name = event['object']['metadata'].get('name')
namespace = event['object']['metadata'].get('namespace')
print("%s - Got %s %s %s:%s"
%(self._name, event_type, kind, namespace, name))
self.logger.debug("%s - Got %s %s %s:%s"
%(self._name, event_type, kind, namespace, name))
if event['type'] == 'ADDED' or event['type'] == 'MODIFIED':
self.vnc_endpoint_add(uid, name, namespace, event)
elif event['type'] == 'DELETED':
self.vnc_endpoint_delete(uid, name, namespace)