class Connection(object):
"""A lightweight connector to Redis database server."""
def __init__(self, host, port, db):
self.host = host
self.port = port
self._db = db
self.redis = Redis(host=self.host, port=self.port, db=self._db)
self.check_connection()
def check_connection(self):
try:
self.redis.randomkey()
logging.info("Connected to Redis[db:%s] on %s:%s" % (self._db, self.host, self.port), exc_info=False)
except:
logging.error("Cannot connect to Redis[db:%s] on %s:%s" % (self._db, self.host, self.port), exc_info=False)
def close(self):
""" Close connection """
self.redis.connection.disconnect()
logging.info("Connection to Redis on %s:%s closed." % (self.host, self.port), exc_info=False)
def __del__(self):
self.close()
def switch_to(self, to_db):
""" Switches the connection from a redis db to another """
""" Closes the connection and establishes it again with a different redis db """
self.redis.connection.disconnect()
self.redis = Redis(host=self.host, port=self.port, db=to_db)
self._db = to_db
self.check_connection()
# Here's a set of function that I think you might need to use frequently.
# You can reach other Redis commands directly from reds.[command] from your Connection subclass.
def get(self, key):
return self.redis.get(key)
def set(self, key, val):
return self.redis.set(key, val)
def save(self):
""" synchronously save the db on disk """
if self.redis.save():
logging.info("Redis[db:%s] saved successfully" % self._db, exc_info=False)
else:
logging.error("Redis[db:%s] was NOT saved successfully" % self._db, exc_info=True)
def bgsave(self):
""" asynchronously save the db on disk """
if self.redis.bgsave():
logging.info("Redis[db:%s] saved successfully" % self._db, exc_info=False)
else:
logging.error("Redis[db:%s] was NOT saved successfully" % self._db, exc_info=True)
def last_save(self):
""" return the unix time stamp of the last successfully saving of the dataset on disk """
return self.redis.lastsave()
curr_ut_cnt = cache.scard(user_todo)
curr_us_cnt = cache.scard(user_set)
curr_expected = curr_us_cnt+curr_ut_cnt
prev_uq_cnt = 0
prev_ut_cnt = 0
prev_us_cnt = 0
prev_expected = 0
try:
while True:
print "-"*10, datetime.now(), "-"*20
prev_us_cnt = curr_us_cnt
curr_us_cnt = cache.scard(user_set)
print "Set:".rjust(8), str(curr_us_cnt).rjust(8), "| delta:", curr_us_cnt-prev_us_cnt
prev_ut_cnt = curr_ut_cnt
curr_ut_cnt = cache.scard(user_todo)
print "Todo:".rjust(8), str(curr_ut_cnt).rjust(8), "| delta:", curr_ut_cnt-prev_ut_cnt
prev_uq_cnt = curr_uq_cnt
curr_uq_cnt = cache.llen(user_q)
print "Queued:".rjust(8), str(curr_uq_cnt).rjust(8), "| delta:", curr_uq_cnt-prev_uq_cnt
prev_expected = curr_expected
curr_expected = curr_us_cnt+curr_ut_cnt
print "Current Expected Total:", curr_expected, "| delta:", curr_expected-prev_expected
print "Last save:", cache.lastsave()
print
sleep(30)
except KeyboardInterrupt:
exit()
