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#! /usr/bin/python
# Copyright 2013 Linaro Limited
# Author Matt Hart <matthew.hart@linaro.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
import logging
import psycopg2
import time
class DBHandler(object):
def __init__(self, config):
logging.debug("Creating new DBHandler: %s" % config["dbhost"])
logging.getLogger().name = "DBHandler"
self.conn = psycopg2.connect(database=config["dbname"], user=config["dbuser"],
password=config["dbpass"], host=config["dbhost"])
self.cursor = self.conn.cursor()
def do_sql(self, sql):
logging.debug("executing sql: %s" % sql)
self.cursor.execute(sql)
self.conn.commit()
def do_sql_with_fetch(self, sql):
logging.debug("executing sql: %s" % sql)
self.cursor.execute(sql)
row = self.cursor.fetchone()
self.conn.commit()
return row
def create_db(self):
logging.info("Creating db table if it doesn't exist")
sql = "create table if not exists pdu_queue (id serial, hostname " \
"text, port int, request text, exectime int)"
self.cursor.execute(sql)
self.conn.commit()
sql = "select column_name from information_schema.columns where " \
"table_name='pdu_queue' and column_name='exectime'"
self.cursor.execute(sql)
res = self.cursor.fetchone()
if not res:
logging.info("Old db schema discovered, upgrading")
sql = "alter table pdu_queue add column exectime int default 1"
self.cursor.execute(sql)
self.conn.commit()
def delete_row(self, row_id):
logging.debug("deleting row %i" % row_id)
self.do_sql("delete from pdu_queue where id=%i" % row_id)
def get_res(self, sql):
return self.cursor.execute(sql)
def get_next_job(self):
now = int(time.time())
row = self.do_sql_with_fetch("select id,hostname,port,request from pdu_queue where (exectime < %i or exectime is null) order by id asc limit 1" % now)
return row
def close(self):
logging.debug("Closing DBHandler")
self.cursor.close()
self.conn.close()
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