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utils.py
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utils.py
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import redis
import json
DEBUG = False
def enable_debug():
global DEBUG
DEBUG = True
def disable_debug():
global DEBUG
DEBUG = False
class RedisClientPool(object):
singleton = None
def __init__(self):
self.clients = {}
self.names = []
@classmethod
def get_pool(cls):
if not cls.singleton:
cls.singleton = RedisClientPool()
return cls.singleton
def load_config(self, config):
""" config has to be either a dict or a file name holding the config dict:
{
"redis1": {"host":"192.168.1.1", "port":3279, "db":0},
"redis2": {"host":"192.168.1.2", "port":3279, "db":0}
}
"""
if isinstance(config, basestring):
try:
configstr = open(config, "r").read()
config = json.loads(configstr)
except:
raise ConfigReadError()
# now config has to be a dict
if not isinstance(config, dict):
raise Exception("Invalid config passed to load_config")
for k in config:
v = config[k]
self.clients[k] = RedisClient(v["host"], v["port"], v["db"])
self.clients[k].ping()
self.names.append(k)
def get_client(self, name):
if name not in self.clients:
raise InvalidRedisClientName()
return self.clients[name]
class RedisClient(object): # A wrapper of redis client for debugging, etc
def __init__(self, host, port, db):
self.client = redis.StrictRedis(host=host, port=port, db=db)
def __getattr__(self, attr):
if DEBUG:
print "Calling command %s of redis client"%attr
return getattr(self.client, attr)
class ConfigReadError(Exception):
"""Raised when failed to read or parse config file"""
class RedisNotInitialized(Exception):
"""Raised when redis client is not ready"""
class RedisOperationFailure(Exception):
"""Raised when redis command returns failure"""
class RedisNestedTypeError(Exception):
"""Raised when a nested type within dbase is neither atomic type or a dbase type"""
class InvalidRedisClientName(Exception):
"""Raised when the redis client of that name is not found"""