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database.py
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database.py
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import psycopg2
import random
import logging
import time
logging = logging.getLogger(__name__)
class DB():
conn = None
delay = 1
maxDelay = 900
factor = 0.95
jitter = 0.1
def __init__(self, database, user, password, host, port):
while (self.delay <= self.maxDelay):
try:
self.conn = psycopg2.connect(database=database, user=user, password=password, host=host, port=port)
logging.debug("Connect to db %s successfull on port %s" % (database,port))
break
except psycopg2.Error, e:
logging.debug("Delay:%s;Can't connect to db %s on port %s(ErrCode:%s, ErrMessage:%s)" % (str(self.delay),database,port,e.pgcode,e.pgerror))
time.sleep(self.delay)
self.delay = min(self.delay*self.factor, self.maxDelay)
self.delay = self.delay + random.gauss(self.delay, self.jitter)
logging.debug("DelaySet:%s" % str(self.delay))
def __del__(self):
if self.conn is not None:
self.conn.close()