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# -------------------------------------------------------------------------
# Copyright (c) 2015-2017 AT&T Intellectual Property
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# -------------------------------------------------------------------------
#
import jaydebeapi
import sqlalchemy.pool as pool
from jaydebeapi import _DEFAULT_CONVERTERS, _java_to_py
from osdf.utils.programming_utils import MetaSingleton
from osdf.config.base import osdf_config
_DEFAULT_CONVERTERS.update({'BIGINT': _java_to_py('longValue')})
class VerticaDB(metaclass=MetaSingleton):
connection_pool = None
def get_connection(self):
p = self.get_config_params()
c = jaydebeapi.connect(
'com.vertica.jdbc.Driver',
'jdbc:vertica://{}:{}/{}'.format(p['host'], p['port'], p['db']),
{'user': p['user'], 'password': p['passwd'], 'CHARSET': 'UTF8'},
jars=[p['db_driver']]
)
return c
def get_config_params(self):
config = osdf_config["deployment"]
host, port, db = config["verticaHost"], config["verticaPort"], config.get("verticaDB")
user, passwd = config["verticaUsername"], config["verticaPassword"]
jar_path = osdf_config['core']['osdf_system']['vertica_jar']
params = dict(host=host, db=db, user=user, passwd=passwd, port=port, db_driver=jar_path)
return params
def connect(self):
if self.connection_pool is None:
self.connection_pool = pool.QueuePool(self.get_connection, max_overflow=10, pool_size=5, recycle=600)
conn = self.connection_pool.connect()
cursor = conn.cursor()
return conn, cursor
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