Redis 通过mset提速查询

背景

有些业务需要删除一些不知来源的key，由于不确定是否会影响线上，所以需要在删除前先备份

于是写了个备份str类型的key的小工具方便业务方参考

注意：一次操作的key的个数不要超过1000个，否则会影响proxy的性能

#!/bin/python3

import redis

keys_f="keys.txt"
set_cmd_f="mset.txt"
n=0
para=1000
keys_roll=[]
proxy_ip='127.0.0.1'
port=9999

def getSetCmd(keys):
    set_cmd=["mset"]
    r = redis.StrictRedis(host=proxy_ip, port=port, db=0, socket_timeout=0.5, socket_connect_timeout=0.5)
    values=r.mget(keys)
    for i in range(len(values)):
        k=keys_roll[i]
        value=values[i]
        # key不存则不考虑
        if value is not None:
            v=str(value.decode('utf-8'))
            if v=='':
                v='\"\"'
            set_cmd.append(k)
            set_cmd.append(v)
    set_cmd=' '.join(set_cmd)
    print(set_cmd)
    with open(set_cmd_f,'a') as inf:
        inf.write(set_cmd+'\n')
with open(keys_f) as out:
    keys=out.readlines()
    for key in keys:
        key=key.strip() # strip "\n"
        n=n+1
        mo=n%para
        keys_roll.append(key)
        if mo==0:
            getSetCmd(keys_roll)
            keys_roll=[]
# 最后一批次不满设置的并发度
if mo != 0:
    getSetCmd(keys_roll)
    keys_roll=[]