/
vnc_amqp.py
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/
vnc_amqp.py
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import socket
import gevent
import cStringIO
from pprint import pformat
from cfgm_common.utils import cgitb_hook
from cfgm_common.exceptions import NoIdError
from cfgm_common.vnc_kombu import VncKombuClient
from cfgm_common.dependency_tracker import DependencyTracker
from cfgm_common.uve.msg_traces.ttypes import MessageBusNotifyTrace,\
DependencyTrackerResource
class VncAmqpHandle(object):
def __init__(self, logger, db_cls, reaction_map, q_name_prefix, args=None):
self.logger = logger
self.db_cls = db_cls
self.reaction_map = reaction_map
self.q_name_prefix = q_name_prefix
self._db_resync_done = gevent.event.Event()
self._args = args
def establish(self):
q_name = '.'.join([self.q_name_prefix, socket.gethostname()])
self._vnc_kombu = VncKombuClient(
self._args.rabbit_server, self._args.rabbit_port,
self._args.rabbit_user, self._args.rabbit_password,
self._args.rabbit_vhost, self._args.rabbit_ha_mode,
q_name, self._vnc_subscribe_callback,
self.logger.log, rabbit_use_ssl=self._args.rabbit_use_ssl,
kombu_ssl_version=self._args.kombu_ssl_version,
kombu_ssl_keyfile=self._args.kombu_ssl_keyfile,
kombu_ssl_certfile=self._args.kombu_ssl_certfile,
kombu_ssl_ca_certs=self._args.kombu_ssl_ca_certs)
def msgbus_store_err_msg(self, msg):
self.msg_tracer.error = msg
def msgbus_trace_msg(self):
self.msg_tracer.trace_msg(name='MessageBusNotifyTraceBuf',
sandesh=self.logger._sandesh)
def _vnc_subscribe_callback(self, oper_info):
self._db_resync_done.wait()
try:
self.oper_info = oper_info
self.vnc_subscribe_actions()
except Exception:
string_buf = cStringIO.StringIO()
cgitb_hook(file=string_buf, format="text")
self.logger.error(string_buf.getvalue())
self.msgbus_store_err_msg(string_buf.getvalue())
try:
with open(self._args.trace_file, 'a') as err_file:
err_file.write(string_buf.getvalue())
except IOError:
pass
finally:
try:
self.msgbus_trace_msg()
except Exception:
pass
del self.oper_info
del self.obj_type
del self.obj_class
del self.obj
del self.dependency_tracker
def create_msgbus_trace(self, request_id, oper, uuid):
self.msg_tracer = MessageBusNotifyTrace(request_id=request_id,
operation=oper, uuid=uuid)
def vnc_subscribe_actions(self):
msg = "Notification Message: %s" % (pformat(self.oper_info))
self.logger.debug(msg)
self.obj = None
self.dependency_tracker = None
self.obj_type = self.oper_info['type'].replace('-', '_')
self.obj_class = self.db_cls.get_obj_type_map().get(self.obj_type)
if self.obj_class is None:
return
oper = self.oper_info['oper']
obj_id = self.oper_info['uuid']
self.create_msgbus_trace(self.oper_info.get('request_id'),
oper, obj_id)
if oper == 'CREATE':
self.handle_create()
elif oper == 'UPDATE':
self.handle_update()
elif oper == 'DELETE':
self.handle_delete()
else:
self.handle_unknown()
return
if self.obj is None:
self.logger.warning("Object %s uuid %s was not found for operation %s" % (
self. obj_type, obj_id, oper))
return
self.evaluate_dependency()
def _get_key_from_oper_info(self):
if self.db_cls._indexed_by_name:
return ':'.join(self.oper_info['fq_name'])
return self.oper_info['uuid']
def handle_create(self):
obj_key = self._get_key_from_oper_info()
obj_id = self.oper_info['uuid']
obj_fq_name = self.oper_info['fq_name']
self.db_cls._object_db.cache_uuid_to_fq_name_add(
obj_id, obj_fq_name, self.obj_type)
self.obj = self.obj_class.locate(obj_key)
if self.obj is None:
self.logger.info('%s id %s fq_name %s not found' % (
self.obj_type, obj_id, obj_fq_name))
return
self.dependency_tracker = DependencyTracker(
self.db_cls.get_obj_type_map(), self.reaction_map)
self.dependency_tracker.evaluate(self.obj_type, self.obj)
def handle_update(self):
obj_id = self.oper_info['uuid']
self.obj = self.obj_class.get_by_uuid(obj_id)
old_dt = None
if self.obj is not None:
old_dt = DependencyTracker(
self.db_cls.get_obj_type_map(), self.reaction_map)
old_dt.evaluate(self.obj_type, self.obj)
else:
self.logger.info('%s id %s not found' % (self.obj_type,
obj_id))
return
try:
if self.obj.update() == False:
# If update returns a False it indicates nothing has changed.
# If it returns True or None, then some change was detected.
# If no change, then terminate dependency tracker
return
except NoIdError:
obj_id = self.oper_info['uuid']
self.logger.warning('%s uuid %s update caused NoIdError' %
(self.obj_type, obj_id))
return
self.dependency_tracker = DependencyTracker(
self.db_cls.get_obj_type_map(), self.reaction_map)
self.dependency_tracker.evaluate(self.obj_type, self.obj)
if old_dt:
for resource, ids in old_dt.resources.items():
if resource not in self.dependency_tracker.resources:
self.dependency_tracker.resources[resource] = ids
else:
self.dependency_tracker.resources[resource] = list(
set(self.dependency_tracker.resources[resource]) |
set(ids))
def handle_delete(self):
obj_id = self.oper_info['uuid']
self.obj = self.obj_class.get_by_uuid(obj_id)
self.db_cls._object_db.cache_uuid_to_fq_name_del(obj_id)
if self.obj is None:
return
self.dependency_tracker = DependencyTracker(
self.db_cls.get_obj_type_map(), self.reaction_map)
self.dependency_tracker.evaluate(self.obj_type, self.obj)
obj_key = self._get_key_from_oper_info()
self.obj_class.delete(obj_key)
def handle_unknown(self):
# unknown operation
self.logger.error('Unknown operation %s' % self.oper_info['oper'])
def init_msgbus_fq_name(self):
self.msg_tracer.fq_name = self.obj.name
def init_msgbus_dtr(self):
self.msg_tracer.dependency_tracker_resources = []
def add_msgbus_dtr(self, res_type, res_id_list):
dtr = DependencyTrackerResource(obj_type=res_type,
obj_keys=res_id_list)
self.msg_tracer.dependency_tracker_resources.append(dtr)
def evaluate_dependency(self):
if not self.dependency_tracker:
return
self.init_msgbus_fq_name()
self.init_msgbus_dtr()
for res_type, res_id_list in self.dependency_tracker.resources.items():
if not res_id_list:
continue
self.add_msgbus_dtr(res_type, res_id_list)
cls = self.db_cls.get_obj_type_map().get(res_type)
if cls is None:
continue
for res_id in res_id_list:
res_obj = cls.get(res_id)
if res_obj is not None:
res_obj.evaluate()
def close(self):
self._vnc_kombu.shutdown()