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##############################################################################
# Copyright (c) 2015 EMC and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
from _sqlite3 import OperationalError
from threading import Lock
import logging
import sqlite3
db_mutex = Lock()
class ConfigurationDB(object):
db_name = "StorPerfConfig.db"
def __init__(self):
"""
Creates the StorPerfConfig.db and configuration tables on demand
"""
self.logger = logging.getLogger(__name__)
self.logger.debug("Connecting to " + ConfigurationDB.db_name)
with db_mutex:
db = sqlite3.connect(ConfigurationDB.db_name)
cursor = db.cursor()
try:
cursor.execute('''CREATE TABLE configuration
(configuration_name text,
key text,
value text)''')
self.logger.debug("Created configuration table")
except OperationalError:
self.logger.debug("Configuration table exists")
cursor.execute('SELECT * FROM configuration')
db.commit()
db.close()
def delete_configuration_value(self, configuration_name, key):
"""Deletes the value associated with the given key
"""
with db_mutex:
db = sqlite3.connect(ConfigurationDB.db_name)
cursor = db.cursor()
cursor.execute(
"delete from configuration where configuration_name=? and key=?",
(configuration_name, key))
self.logger.debug("Deleted " + configuration_name + ":" + key)
db.commit()
db.close()
def get_configuration_value(self, configuration_name, key):
"""Returns a string representation of the value stored
with this key under the given configuration name.
"""
with db_mutex:
db = sqlite3.connect(ConfigurationDB.db_name)
cursor = db.cursor()
cursor.execute(
"""select value from configuration
where configuration_name = ?
and key = ?""",
(configuration_name, key,))
row = cursor.fetchone()
return_value = None
if (row is None):
self.logger.debug(
configuration_name + ":" + key + " does not exist")
else:
self.logger.debug(
configuration_name + ":" + key + " is " + str(row[0]))
return_value = str(row[0])
db.close()
return return_value
def set_configuration_value(self, configuration_name, key, value):
"""Updates or creates the key under the given configuration
name so that it holds the value specified.
"""
if (value is None):
return self.delete_configuration_value(configuration_name, key)
with db_mutex:
value = str(value)
db = sqlite3.connect(ConfigurationDB.db_name)
cursor = db.cursor()
cursor.execute(
"delete from configuration where configuration_name=? and key=?",
(configuration_name, key))
cursor.execute(
"""insert into configuration(configuration_name, key, value)
values (?,?,?)""", (configuration_name, key, value))
self.logger.debug(
configuration_name + ":" + key + " set to " + value)
db.commit()
db.close()
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