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ansys_cmd.md

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English | 中文版

Redis Source Code Analysis - Command Line

[TOC]

Definition

struct redisCommand redisCommandTable[] = {
	 {"get",getCommand,2,"rF",0,NULL,1,1,1,0,0},
	 {"set",setCommand,-3,"wm",0,NULL,1,1,1,0,0},
	 {"setnx",setnxCommand,3,"wmF",0,NULL,1,1,1,0,0},
	 {"setex",setexCommand,4,"wm",0,NULL,1,1,1,0,0},
	 {"psetex",psetexCommand,4,"wm",0,NULL,1,1,1,0,0},
	 {"append",appendCommand,3,"wm",0,NULL,1,1,1,0,0},
	 {"strlen",strlenCommand,2,"rF",0,NULL,1,1,1,0,0},
	 {"del",delCommand,-2,"w",0,NULL,1,-1,1,0,0},
	 {"exists",existsCommand,-2,"rF",0,NULL,1,-1,1,0,0},
	 {"setbit",setbitCommand,4,"wm",0,NULL,1,1,1,0,0},
	 {"getbit",getbitCommand,3,"rF",0,NULL,1,1,1,0,0},
	 {"setrange",setrangeCommand,4,"wm",0,NULL,1,1,1,0,0},
	 {"getrange",getrangeCommand,4,"r",0,NULL,1,1,1,0,0},
	 {"substr",getrangeCommand,4,"r",0,NULL,1,1,1,0,0},
	 {"incr",incrCommand,2,"wmF",0,NULL,1,1,1,0,0},
	 {"decr",decrCommand,2,"wmF",0,NULL,1,1,1,0,0},
	 {"mget",mgetCommand,-2,"r",0,NULL,1,-1,1,0,0},
	 {"rpush",rpushCommand,-3,"wmF",0,NULL,1,1,1,0,0},
	 {"lpush",lpushCommand,-3,"wmF",0,NULL,1,1,1,0,0},
	 {"rpushx",rpushxCommand,3,"wmF",0,NULL,1,1,1,0,0},
	 {"lpushx",lpushxCommand,3,"wmF",0,NULL,1,1,1,0,0},
	 {"linsert",linsertCommand,5,"wm",0,NULL,1,1,1,0,0},
	 {"rpop",rpopCommand,2,"wF",0,NULL,1,1,1,0,0},
	 {"lpop",lpopCommand,2,"wF",0,NULL,1,1,1,0,0},
	 {"brpop",brpopCommand,-3,"ws",0,NULL,1,1,1,0,0},
	 {"brpoplpush",brpoplpushCommand,4,"wms",0,NULL,1,2,1,0,0},
	 {"blpop",blpopCommand,-3,"ws",0,NULL,1,-2,1,0,0},
	 {"llen",llenCommand,2,"rF",0,NULL,1,1,1,0,0},
	 {"lindex",lindexCommand,3,"r",0,NULL,1,1,1,0,0},
	 {"lset",lsetCommand,4,"wm",0,NULL,1,1,1,0,0},
	 {"lrange",lrangeCommand,4,"r",0,NULL,1,1,1,0,0},
	 {"ltrim",ltrimCommand,4,"w",0,NULL,1,1,1,0,0},
	 {"lrem",lremCommand,4,"w",0,NULL,1,1,1,0,0},
	 {"rpoplpush",rpoplpushCommand,3,"wm",0,NULL,1,2,1,0,0},
	 {"sadd",saddCommand,-3,"wmF",0,NULL,1,1,1,0,0},
	 {"srem",sremCommand,-3,"wF",0,NULL,1,1,1,0,0},
	 {"smove",smoveCommand,4,"wF",0,NULL,1,2,1,0,0},
	 {"sismember",sismemberCommand,3,"rF",0,NULL,1,1,1,0,0},
	 {"scard",scardCommand,2,"rF",0,NULL,1,1,1,0,0},
	 {"spop",spopCommand,2,"wRsF",0,NULL,1,1,1,0,0},
	 {"srandmember",srandmemberCommand,-2,"rR",0,NULL,1,1,1,0,0},
	 {"sinter",sinterCommand,-2,"rS",0,NULL,1,-1,1,0,0},
	 {"sinterstore",sinterstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
	 {"sunion",sunionCommand,-2,"rS",0,NULL,1,-1,1,0,0},
	 {"sunionstore",sunionstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
	 {"sdiff",sdiffCommand,-2,"rS",0,NULL,1,-1,1,0,0},
	 {"sdiffstore",sdiffstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
	 {"smembers",sinterCommand,2,"rS",0,NULL,1,1,1,0,0},
	 {"sscan",sscanCommand,-3,"rR",0,NULL,1,1,1,0,0},
	 {"zadd",zaddCommand,-4,"wmF",0,NULL,1,1,1,0,0},
	 {"zincrby",zincrbyCommand,4,"wmF",0,NULL,1,1,1,0,0},
	 {"zrem",zremCommand,-3,"wF",0,NULL,1,1,1,0,0},
	 {"zremrangebyscore",zremrangebyscoreCommand,4,"w",0,NULL,1,1,1,0,0},
	 {"zremrangebyrank",zremrangebyrankCommand,4,"w",0,NULL,1,1,1,0,0},
	 {"zremrangebylex",zremrangebylexCommand,4,"w",0,NULL,1,1,1,0,0},
	 {"zunionstore",zunionstoreCommand,-4,"wm",0,zunionInterGetKeys,0,0,0,0,0},
	 {"zinterstore",zinterstoreCommand,-4,"wm",0,zunionInterGetKeys,0,0,0,0,0},
	 {"zrange",zrangeCommand,-4,"r",0,NULL,1,1,1,0,0},
	 {"zrangebyscore",zrangebyscoreCommand,-4,"r",0,NULL,1,1,1,0,0},
	 {"zrevrangebyscore",zrevrangebyscoreCommand,-4,"r",0,NULL,1,1,1,0,0},
	 {"zrangebylex",zrangebylexCommand,-4,"r",0,NULL,1,1,1,0,0},
	 {"zrevrangebylex",zrevrangebylexCommand,-4,"r",0,NULL,1,1,1,0,0},
	 {"zcount",zcountCommand,4,"rF",0,NULL,1,1,1,0,0},
	 {"zlexcount",zlexcountCommand,4,"rF",0,NULL,1,1,1,0,0},
	 {"zrevrange",zrevrangeCommand,-4,"r",0,NULL,1,1,1,0,0},
	 {"zcard",zcardCommand,2,"rF",0,NULL,1,1,1,0,0},
	 {"zscore",zscoreCommand,3,"rF",0,NULL,1,1,1,0,0},
	 {"zrank",zrankCommand,3,"rF",0,NULL,1,1,1,0,0},
	 {"zrevrank",zrevrankCommand,3,"rF",0,NULL,1,1,1,0,0},
	 {"zscan",zscanCommand,-3,"rR",0,NULL,1,1,1,0,0},
	 {"hset",hsetCommand,4,"wmF",0,NULL,1,1,1,0,0},
	 {"hsetnx",hsetnxCommand,4,"wmF",0,NULL,1,1,1,0,0},
	 {"hget",hgetCommand,3,"rF",0,NULL,1,1,1,0,0},
	 {"hmset",hmsetCommand,-4,"wm",0,NULL,1,1,1,0,0},
	 {"hmget",hmgetCommand,-3,"r",0,NULL,1,1,1,0,0},
	 {"hincrby",hincrbyCommand,4,"wmF",0,NULL,1,1,1,0,0},
	 {"hincrbyfloat",hincrbyfloatCommand,4,"wmF",0,NULL,1,1,1,0,0},
	 {"hdel",hdelCommand,-3,"wF",0,NULL,1,1,1,0,0},
	 {"hlen",hlenCommand,2,"rF",0,NULL,1,1,1,0,0},
	 {"hkeys",hkeysCommand,2,"rS",0,NULL,1,1,1,0,0},
	 {"hvals",hvalsCommand,2,"rS",0,NULL,1,1,1,0,0},
	 {"hgetall",hgetallCommand,2,"r",0,NULL,1,1,1,0,0},
	 {"hexists",hexistsCommand,3,"rF",0,NULL,1,1,1,0,0},
	 {"hscan",hscanCommand,-3,"rR",0,NULL,1,1,1,0,0},
	 {"incrby",incrbyCommand,3,"wmF",0,NULL,1,1,1,0,0},
	 {"decrby",decrbyCommand,3,"wmF",0,NULL,1,1,1,0,0},
	 {"incrbyfloat",incrbyfloatCommand,3,"wmF",0,NULL,1,1,1,0,0},
	 {"getset",getsetCommand,3,"wm",0,NULL,1,1,1,0,0},
	 {"mset",msetCommand,-3,"wm",0,NULL,1,-1,2,0,0},
	 {"msetnx",msetnxCommand,-3,"wm",0,NULL,1,-1,2,0,0},
	 {"randomkey",randomkeyCommand,1,"rR",0,NULL,0,0,0,0,0},
	 {"select",selectCommand,2,"rlF",0,NULL,0,0,0,0,0},
	 {"move",moveCommand,3,"wF",0,NULL,1,1,1,0,0},
	 {"rename",renameCommand,3,"w",0,NULL,1,2,1,0,0},
	 {"renamenx",renamenxCommand,3,"wF",0,NULL,1,2,1,0,0},
	 {"expire",expireCommand,3,"wF",0,NULL,1,1,1,0,0},
	 {"expireat",expireatCommand,3,"wF",0,NULL,1,1,1,0,0},
	 {"pexpire",pexpireCommand,3,"wF",0,NULL,1,1,1,0,0},
	 {"pexpireat",pexpireatCommand,3,"wF",0,NULL,1,1,1,0,0},
	 {"keys",keysCommand,2,"rS",0,NULL,0,0,0,0,0},
	 {"scan",scanCommand,-2,"rR",0,NULL,0,0,0,0,0},
	 {"dbsize",dbsizeCommand,1,"rF",0,NULL,0,0,0,0,0},
	 {"auth",authCommand,2,"rsltF",0,NULL,0,0,0,0,0},
	 {"ping",pingCommand,-1,"rtF",0,NULL,0,0,0,0,0},
	 {"echo",echoCommand,2,"rF",0,NULL,0,0,0,0,0},
	 {"save",saveCommand,1,"ars",0,NULL,0,0,0,0,0},
	 {"bgsave",bgsaveCommand,1,"ar",0,NULL,0,0,0,0,0},
	 {"bgrewriteaof",bgrewriteaofCommand,1,"ar",0,NULL,0,0,0,0,0},
	 {"shutdown",shutdownCommand,-1,"arlt",0,NULL,0,0,0,0,0},
	 {"lastsave",lastsaveCommand,1,"rRF",0,NULL,0,0,0,0,0},
	 {"type",typeCommand,2,"rF",0,NULL,1,1,1,0,0},
	 {"multi",multiCommand,1,"rsF",0,NULL,0,0,0,0,0},
	 {"exec",execCommand,1,"sM",0,NULL,0,0,0,0,0},
	 {"discard",discardCommand,1,"rsF",0,NULL,0,0,0,0,0},
	 {"sync",syncCommand,1,"ars",0,NULL,0,0,0,0,0},
	 {"psync",syncCommand,3,"ars",0,NULL,0,0,0,0,0},
	 {"replconf",replconfCommand,-1,"arslt",0,NULL,0,0,0,0,0},
	 {"flushdb",flushdbCommand,1,"w",0,NULL,0,0,0,0,0},
	 {"flushall",flushallCommand,1,"w",0,NULL,0,0,0,0,0},
	 {"sort",sortCommand,-2,"wm",0,sortGetKeys,1,1,1,0,0},
	 {"info",infoCommand,-1,"rlt",0,NULL,0,0,0,0,0},
	 {"monitor",monitorCommand,1,"ars",0,NULL,0,0,0,0,0},
	 {"ttl",ttlCommand,2,"rF",0,NULL,1,1,1,0,0},
	 {"pttl",pttlCommand,2,"rF",0,NULL,1,1,1,0,0},
	 {"persist",persistCommand,2,"wF",0,NULL,1,1,1,0,0},
	 {"slaveof",slaveofCommand,3,"ast",0,NULL,0,0,0,0,0},
	 {"role",roleCommand,1,"lst",0,NULL,0,0,0,0,0},
	 {"debug",debugCommand,-2,"as",0,NULL,0,0,0,0,0},
	 {"config",configCommand,-2,"art",0,NULL,0,0,0,0,0},
	 {"subscribe",subscribeCommand,-2,"rpslt",0,NULL,0,0,0,0,0},
	 {"unsubscribe",unsubscribeCommand,-1,"rpslt",0,NULL,0,0,0,0,0},
	 {"psubscribe",psubscribeCommand,-2,"rpslt",0,NULL,0,0,0,0,0},
	 {"punsubscribe",punsubscribeCommand,-1,"rpslt",0,NULL,0,0,0,0,0},
	 {"publish",publishCommand,3,"pltrF",0,NULL,0,0,0,0,0},
	 {"pubsub",pubsubCommand,-2,"pltrR",0,NULL,0,0,0,0,0},
	 {"watch",watchCommand,-2,"rsF",0,NULL,1,-1,1,0,0},
	 {"unwatch",unwatchCommand,1,"rsF",0,NULL,0,0,0,0,0},
	 {"cluster",clusterCommand,-2,"ar",0,NULL,0,0,0,0,0},
	 {"restore",restoreCommand,-4,"wm",0,NULL,1,1,1,0,0},
	 {"restore-asking",restoreCommand,-4,"wmk",0,NULL,1,1,1,0,0},
	 {"migrate",migrateCommand,-6,"w",0,migrateGetKeys,0,0,0,0,0},
	 {"asking",askingCommand,1,"r",0,NULL,0,0,0,0,0},
	 {"readonly",readonlyCommand,1,"rF",0,NULL,0,0,0,0,0},
	 {"readwrite",readwriteCommand,1,"rF",0,NULL,0,0,0,0,0},
	 {"dump",dumpCommand,2,"r",0,NULL,1,1,1,0,0},
	 {"object",objectCommand,3,"r",0,NULL,2,2,2,0,0},
	 {"client",clientCommand,-2,"rs",0,NULL,0,0,0,0,0},
	 {"eval",evalCommand,-3,"s",0,evalGetKeys,0,0,0,0,0},
	 {"evalsha",evalShaCommand,-3,"s",0,evalGetKeys,0,0,0,0,0},
	 {"slowlog",slowlogCommand,-2,"r",0,NULL,0,0,0,0,0},
	 {"script",scriptCommand,-2,"rs",0,NULL,0,0,0,0,0},
	 {"time",timeCommand,1,"rRF",0,NULL,0,0,0,0,0},
	 {"bitop",bitopCommand,-4,"wm",0,NULL,2,-1,1,0,0},
	 {"bitcount",bitcountCommand,-2,"r",0,NULL,1,1,1,0,0},
	 {"bitpos",bitposCommand,-3,"r",0,NULL,1,1,1,0,0},
	 {"wait",waitCommand,3,"rs",0,NULL,0,0,0,0,0},
	 {"command",commandCommand,0,"rlt",0,NULL,0,0,0,0,0},
	 {"pfselftest",pfselftestCommand,1,"r",0,NULL,0,0,0,0,0},
	 {"pfadd",pfaddCommand,-2,"wmF",0,NULL,1,1,1,0,0},
	 {"pfcount",pfcountCommand,-2,"r",0,NULL,1,-1,1,0,0},
	 {"pfmerge",pfmergeCommand,-2,"wm",0,NULL,1,-1,1,0,0},
	 {"pfdebug",pfdebugCommand,-3,"w",0,NULL,0,0,0,0,0},
	 {"latency",latencyCommand,-2,"arslt",0,NULL,0,0,0,0,0}
};

Implementation

get

  1. Use a "lazy deletion" policy to check whether the key has expired; if it has, delete it.
  2. Look up the key;
    • If found and not expired, return the result;
    • Otherwise return NULL;
  3. Update lookup statistics:
    • Non-NULL: increment stat_keyspace_hits by 1;
    • NULL: increment stat_keyspace_misses by 1;

set

SET key value [NX] [XX] [EX <seconds>] [PX <milliseconds>]

  • key: the key
  • value: the value
  • NX
  • XX
  • EX
  • PX

References

[1] Huang Jianhong. Redis Design and Implementation