下面是redis的封装,使用多线程的话,保证线程安全就把下面的线程锁打开
import redis
import threading
import logging
class RedisClient(object):
"""
py2.7, py3.4
"""
# mutex = threading.Lock() # gevent 里使用线程锁可能有问题
config = None
connection_pool = None
connection_client = None
def __init__(self, config):
"""
:param config: {"host":"",
"port": 0,
"index": 0,
"auth": "",
"encoding": "",
"decode_responses": False,
"max_connections": 1,
"target_max_memory": 1024
}
"""
self.config = config
max_conn = 1
if "max_connections" in self.config:
max_conn = self.config["max_connections"]
if max_conn <= 0:
max_conn = 1
decode_responses = False
if "decode_responses" in config:
decode_responses = config["decode_responses"]
temp_pool = redis.ConnectionPool(host=self.config['host'], port=self.config['port'], db=self.config['index'], password=self.config['auth'],
encoding=self.config['encoding'], max_connections=max_conn, decode_responses=decode_responses)
self.connection_pool = temp_pool
temp_client = redis.Redis(connection_pool=self.connection_pool)
self.connection_client = temp_client
def rpush(self, key, json_text, expired_in_seconds=0):
r = self.connection_client
# self.mutex.acquire()
pipe = r.pipeline()
pipe.rpush(key, json_text)
if expired_in_seconds > 0:
pipe.expire(key, expired_in_seconds)
pipe.execute()
# self.mutex.release()
def lpush(self, key, json_text, expired_in_seconds=0):
r = self.connection_client
# self.mutex.acquire()
pipe = r.pipeline()
pipe.lpush(key, json_text)
if expired_in_seconds > 0:
pipe.expire(key, expired_in_seconds)
pipe.execute()
# self.mutex.release()
def lpop_pipline(self, key, length):
i = 0
poped_items = []
r = self.connection_client
# self.mutex.acquire()
curent_len = r.llen(key)
if curent_len > 0:
target_len = 0
if curent_len > length:
target_len = length
else:
target_len = curent_len
pipe = r.pipeline()
while i < target_len:
pipe.lpop(key)
i += 1
temp_poped_items = pipe.execute()
poped_items = temp_poped_items
# self.mutex.release()
return poped_items
def lpop(self, key):
poped_items = []
r = self.connection_client
# self.mutex.acquire()
data = r.lpop(key)
if data:
poped_items.append(data)
# self.mutex.release()
return poped_items
def rpop_pipline(self, key, length):
i = 0
poped_items = []
r = self.connection_client
# self.mutex.acquire()
curent_len = r.llen(key)
if curent_len > 0:
target_len = 0
if curent_len > length:
target_len = length
else:
target_len = curent_len
pipe = r.pipeline()
while i < target_len:
pipe.rpop(key)
i += 1
temp_poped_items = pipe.execute()
poped_items = temp_poped_items
# self.mutex.release()
return poped_items
def rpop(self, key):
poped_items = []
r = self.connection_client
# self.mutex.acquire()
data = r.rpop(key)
if data:
poped_items.append(data)
# self.mutex.release()
return poped_items
def hincrby(self, hash_key, field, amount=1):
r = self.connection_client
# self.mutex.acquire()
result = r.hincrby(hash_key, field, amount)
# self.mutex.release()
return result
def llen(self, key):
r = self.connection_client
# self.mutex.acquire()
result = r.llen(key)
# self.mutex.release()
return result
def hdel(self, key, field):
r = self.connection_client
# self.mutex.acquire()
result = r.hdel(key, field)
# self.mutex.release()
return result
def hset(self, key, field, value, expired_in_seconds=0):
r = self.connection_client
# self.mutex.acquire()
pipline = r.pipeline()
pipline.hset(key, field, value)
if expired_in_seconds > 0:
pipline.expire(key, expired_in_seconds)
pipline.execute()
# self.mutex.release()
def info(self, section=None):
r = self.connection_client
# self.mutex.acquire()
result = r.info(section)
# self.mutex.release()
return result
def exceed_memory_limits(self):
result = False
if "target_max_memory" in self.config.keys():
target_max_memory = self.config["target_max_memory"]
redis_info = self.info("memory")
distance = self.__max_memory_distance(redis_info, target_max_memory)
if distance and distance <= 0:
result = True
return result
def __max_memory_distance(self, redis_info_dict, target_max):
# # Memory
# used_memory:472978192
# used_memory_human:451.07M
# used_memory_rss:510640128
# used_memory_peak:493548568
# used_memory_peak_human:470.68M
# used_memory_lua:35840
# mem_fragmentation_ratio:1.08
# mem_allocator:jemalloc - 3.6.0
result = None
if "used_memory" in redis_info_dict.keys():
temp_used = int(redis_info_dict["used_memory"])
temp_used = temp_used / (1024 * 1024)
result = target_max - temp_used
else:
logging.warning(u"used_memory is not found!")
return result
def sadd(self, key, value):
r = self.connection_client
# self.mutex.acquire()
result = r.sadd(key, value)
# self.mutex.release()
return result
def sismember(self, key, value):
r = self.connection_client
# self.mutex.acquire()
result = r.sismember(key, value)
# self.mutex.release()
return result
def exists(self, key):
r = self.connection_client
# self.mutex.acquire()
result = r.exists(key)
# self.mutex.release()
return result
def keys(self, pattern):
r = self.connection_client
# self.mutex.acquire()
result = r.keys(pattern=pattern)
# self.mutex.release()
return result
def delele(self, key):
r = self.connection_client
# self.mutex.acquire()
r.delete(key)
# self.mutex.release()
def scan(self, cursor, match=None, count=50):
"""
:param cursor:
:param match:
:param count:
:return:
(new_cursor,
[key1, key2, key3 ...])
"""
r = self.connection_client
# self.mutex.acquire()
result = r.scan(cursor=cursor, match=match, count=count)
# self.mutex.release()
return result
def hmget(self, hash_key, fields_list):
r = self.connection_client
# self.mutex.acquire()
result = r.hmget(hash_key, fields_list)
# self.mutex.release()
return result
def set(self, key, value, ex=None):
r = self.connection_client
# self.mutex.acquire()
result = r.set(key, value, ex)
# self.mutex.release()
return result
def close(self):
if self.connection_pool:
self.connection_pool.disconnect()
config = {
"host": "",
"port": 6379,
"auth": "",
"index": 11,
"encoding": "utf-8",
"decode_responses": True, # 获取中文数据可以直接 decode python unicode
"target_max_memory": 3896,
"max_connections": 1
}
redis_client = RedisClient(config)
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