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db.py
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db.py
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
#
"""
Service monitor DB to store VM, SI information
"""
import pycassa
from pycassa.system_manager import *
from pysandesh.gen_py.process_info.ttypes import ConnectionStatus
from sandesh_common.vns.constants import SVC_MONITOR_KEYSPACE_NAME, \
CASSANDRA_DEFAULT_GC_GRACE_SECONDS
import inspect
import json
import time
class ServiceMonitorDB(object):
_KEYSPACE = SVC_MONITOR_KEYSPACE_NAME
def __init__(self, args=None):
self._args = args
if args.cluster_id:
self._keyspace = '%s_%s' % (args.cluster_id,
ServiceMonitorDB._KEYSPACE)
else:
self._keyspace = ServiceMonitorDB._KEYSPACE
# update with logger instance
def add_logger(self, logger):
self._logger = logger
# db CRUD
def _db_get(self, table, key):
try:
entry = table.get(key)
except Exception as e:
self._logger.log("DB: %s %s get failed" %
(inspect.stack()[1][3], key))
return None
return entry
def _db_insert(self, table, key, entry):
try:
table.insert(key, entry)
except Exception as e:
self._logger.log("DB: %s %s insert failed" %
(inspect.stack()[1][3], key))
return False
return True
def _db_remove(self, table, key, columns=None):
try:
if columns:
table.remove(key, columns=columns)
else:
table.remove(key)
except Exception as e:
self._logger.log("DB: %s %s remove failed" %
(inspect.stack()[1][3], key))
return False
return True
def _db_list(self, table):
try:
entries = list(table.get_range())
except Exception as e:
self._logger.log("DB: %s list failed" %
(inspect.stack()[1][3]))
return None
return entries
# initialize cassandra
def _cassandra_init(self, cf_name):
server_idx = 0
num_dbnodes = len(self._args.cassandra_server_list)
connected = False
# Update connection info
self._logger.db_conn_status_update(ConnectionStatus.INIT,
self._args.cassandra_server_list)
while not connected:
try:
cass_server = self._args.cassandra_server_list[server_idx]
sys_mgr = SystemManager(cass_server)
connected = True
except Exception as e:
# Update connection info
self._logger.db_conn_status_update(ConnectionStatus.DOWN,
[cass_server], str(e))
server_idx = (server_idx + 1) % num_dbnodes
time.sleep(3)
# Update connection info
self._logger.db_conn_status_update(ConnectionStatus.UP,
self._args.cassandra_server_list)
if self._args.reset_config:
try:
sys_mgr.drop_keyspace(self._keyspace)
except pycassa.cassandra.ttypes.InvalidRequestException as e:
print "Warning! " + str(e)
try:
sys_mgr.create_keyspace(self._keyspace, SIMPLE_STRATEGY,
{'replication_factor': str(num_dbnodes)})
except pycassa.cassandra.ttypes.InvalidRequestException as e:
print "Warning! " + str(e)
# set up column families
column_families = [cf_name]
gc_grace_sec = CASSANDRA_DEFAULT_GC_GRACE_SECONDS
for cf in column_families:
try:
sys_mgr.create_column_family(self._keyspace, cf, gc_grace_seconds=gc_grace_sec)
except pycassa.cassandra.ttypes.InvalidRequestException as e:
print "Warning! " + str(e)
sys_mgr.alter_column_family(self._keyspace, cf, gc_grace_seconds=gc_grace_sec)
conn_pool = pycassa.ConnectionPool(self._keyspace,
self._args.cassandra_server_list,
max_overflow=10,
use_threadlocal=True,
prefill=True,
pool_size=10,
pool_timeout=30,
max_retries=-1,
timeout=0.5)
rd_consistency = pycassa.cassandra.ttypes.ConsistencyLevel.QUORUM
wr_consistency = pycassa.cassandra.ttypes.ConsistencyLevel.QUORUM
svc_cf = pycassa.ColumnFamily(conn_pool, cf_name,
read_consistency_level=rd_consistency,
write_consistency_level=wr_consistency)
return svc_cf
class ServiceInstanceDB(ServiceMonitorDB):
_SVC_SI_CF = 'service_instance_table'
def init_database(self):
self._svc_si_cf = self._cassandra_init(self._SVC_SI_CF)
def get_vm_db_prefix(self, inst_count):
return('vm' + str(inst_count) + '-')
def remove_vm_info(self, si_fq_str, vm_uuid):
si_info = self.service_instance_get(si_fq_str)
if not si_info:
return
prefix = None
for key, item in si_info.items():
if item == vm_uuid:
prefix = key.split('-')[0]
break
if not prefix:
return
vm_column_list = []
for key in si_info.keys():
if key.startswith(prefix):
vm_column_list.append(key)
self.service_instance_remove(si_fq_str, vm_column_list)
# service instance CRUD
def service_instance_get(self, si_fq_str):
return self._db_get(self._svc_si_cf, si_fq_str)
def service_instance_insert(self, si_fq_str, entry):
return self._db_insert(self._svc_si_cf, si_fq_str, entry)
def service_instance_remove(self, si_fq_str, columns=None):
return self._db_remove(self._svc_si_cf, si_fq_str, columns)
def service_instance_list(self):
return self._db_list(self._svc_si_cf)
class LBDB(ServiceMonitorDB):
_LB_CF = 'pool_table'
def init_database(self):
self._lb_cf = self._cassandra_init(self._LB_CF)
def pool_config_get(self, pool_id):
json_str = self._db_get(self._lb_cf, pool_id)
if json_str and 'config_info' in json_str:
return json.loads(json_str['config_info'])
else:
return None
def pool_driver_info_get(self, pool_id):
json_str = self._db_get(self._lb_cf, pool_id)
if json_str and 'driver_info' in json_str:
return json.loads(json_str['driver_info'])
else:
return None
def pool_config_insert(self, pool_id, pool_obj):
entry = json.dumps(pool_obj)
return self._db_insert(self._lb_cf, pool_id, {'config_info': entry})
def pool_driver_info_insert(self, pool_id, pool_obj):
entry = json.dumps(pool_obj)
return self._db_insert(self._lb_cf, pool_id, {'driver_info': entry})
def pool_remove(self, pool_id, columns=None):
return self._db_remove(self._lb_cf, pool_id, columns)
def pool_list(self):
ret_list = []
for each_entry_id, each_entry_data in self._db_list(self._lb_cf) or []:
config_info_obj_dict = json.loads(each_entry_data['config_info'])
driver_info_obj_dict = None
if 'driver_info' in each_entry_data:
driver_info_obj_dict = json.loads(each_entry_data['driver_info'])
ret_list.append((each_entry_id, config_info_obj_dict, driver_info_obj_dict))
return ret_list