import redis import os import configparser import logging DATABASE_VERSION = [ 1 ] configfile = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'config/config.cfg') cfg = configparser.ConfigParser() cfg.read(configfile) serv_log = redis.StrictRedis( host=cfg.get('RedisGlobal', 'host'), port=cfg.getint('RedisGlobal', 'port'), db=cfg.getint('RedisLog', 'db')) serv_redis_db = redis.StrictRedis( host=cfg.get('RedisGlobal', 'host'), port=cfg.getint('RedisGlobal', 'port'), db=cfg.getint('RedisDB', 'db')) serv_list = redis.StrictRedis( host=cfg.get('RedisGlobal', 'host'), port=cfg.getint('RedisGlobal', 'port'), db=cfg.getint('RedisLIST', 'db')) # logger logDir = cfg.get('Log', 'directory') logfilename = cfg.get('Log', 'update_filename') logPath = os.path.join(logDir, logfilename) if not os.path.exists(logDir): os.makedirs(logDir) handler = logging.FileHandler(logPath) formatter = logging.Formatter('%(asctime)s:%(levelname)s:%(name)s:%(message)s') handler.setFormatter(formatter) update_logger = logging.getLogger(__name__) update_logger.setLevel(logging.INFO) update_logger.addHandler(handler) def check_for_updates(): db_version = serv_redis_db.get(cfg.get('RedisDB', 'dbVersion')) db_version = int(db_version) if db_version is not None else 0 updates_to_be_done = find_updates(db_version) if len(updates_to_be_done) == 0: update_logger.info('database up-to-date') else: for i in updates_to_be_done: exec_updates(i) def find_updates(db_version): updates_to_be_done = [] for i in DATABASE_VERSION: if db_version < i: updates_to_be_done.append(i) return updates_to_be_done def exec_updates(db_version): result = False if db_version == 1: result = apply_update_1() if result: serv_redis_db.set(cfg.get('RedisDB', 'dbVersion'), db_version) update_logger.warning(f'dbVersion sets to {db_version}') else: update_logger.error(f'Something went wrong. {result}') # Data format changed. Wipe the key. def apply_update_1(): serv_redis_db.delete('TEMP_CACHE_LIVE:Attribute') log_text = 'Executed update 1. Deleted Redis key `TEMP_CACHE_LIVE:Attribute`' print(log_text) update_logger.info(log_text) return True