X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/c7cf2ec97cc81a854ab58fd6755dcfe1cbc3fdc9..44b38ef43259e8805b01db01ad9a1c67479c6194:/redis.c diff --git a/redis.c b/redis.c index 358463cd..19abda20 100644 --- a/redis.c +++ b/redis.c @@ -27,16 +27,24 @@ * POSSIBILITY OF SUCH DAMAGE. */ -#define REDIS_VERSION "0.100" +#define REDIS_VERSION "1.050" #include "fmacros.h" +#include "config.h" #include #include #include #include #include +#define __USE_POSIX199309 #include + +#ifdef HAVE_BACKTRACE +#include +#include +#endif /* HAVE_BACKTRACE */ + #include #include #include @@ -49,7 +57,13 @@ #include #include #include +#include + +#if defined(__sun) +#include "solarisfixes.h" +#endif +#include "redis.h" #include "ae.h" /* Event driven programming library */ #include "sds.h" /* Dynamic safe strings */ #include "anet.h" /* Networking the easy way */ @@ -74,20 +88,31 @@ #define REDIS_OBJFREELIST_MAX 1000000 /* Max number of objects to cache */ #define REDIS_MAX_SYNC_TIME 60 /* Slave can't take more to sync */ #define REDIS_EXPIRELOOKUPS_PER_CRON 100 /* try to expire 100 keys/second */ +#define REDIS_MAX_WRITE_PER_EVENT (1024*64) +#define REDIS_REQUEST_MAX_SIZE (1024*1024*256) /* max bytes in inline command */ /* Hash table parameters */ #define REDIS_HT_MINFILL 10 /* Minimal hash table fill 10% */ -#define REDIS_HT_MINSLOTS 16384 /* Never resize the HT under this */ /* Command flags */ -#define REDIS_CMD_BULK 1 -#define REDIS_CMD_INLINE 2 +#define REDIS_CMD_BULK 1 /* Bulk write command */ +#define REDIS_CMD_INLINE 2 /* Inline command */ +/* REDIS_CMD_DENYOOM reserves a longer comment: all the commands marked with + this flags will return an error when the 'maxmemory' option is set in the + config file and the server is using more than maxmemory bytes of memory. + In short this commands are denied on low memory conditions. */ +#define REDIS_CMD_DENYOOM 4 /* Object types */ #define REDIS_STRING 0 #define REDIS_LIST 1 #define REDIS_SET 2 -#define REDIS_HASH 3 +#define REDIS_ZSET 3 +#define REDIS_HASH 4 + +/* Objects encoding */ +#define REDIS_ENCODING_RAW 0 /* Raw representation */ +#define REDIS_ENCODING_INT 1 /* Encoded as integer */ /* Object types only used for dumping to disk */ #define REDIS_EXPIRETIME 253 @@ -162,12 +187,17 @@ /* Anti-warning macro... */ #define REDIS_NOTUSED(V) ((void) V) +#define ZSKIPLIST_MAXLEVEL 32 /* Should be enough for 2^32 elements */ +#define ZSKIPLIST_P 0.25 /* Skiplist P = 1/4 */ + /*================================= Data types ============================== */ /* A redis object, that is a type able to hold a string / list / set */ typedef struct redisObject { void *ptr; - int type; + unsigned char type; + unsigned char encoding; + unsigned char notused[2]; int refcount; } robj; @@ -184,9 +214,10 @@ typedef struct redisClient { redisDb *db; int dictid; sds querybuf; - robj **argv; - int argc; + robj **argv, **mbargv; + int argc, mbargc; int bulklen; /* bulk read len. -1 if not in bulk read mode */ + int multibulk; /* multi bulk command format active */ list *reply; int sentlen; time_t lastinteraction; /* time of the last interaction, used for timeout */ @@ -230,13 +261,18 @@ struct redisServer { int maxidletime; int dbnum; int daemonize; + int appendonly; + int appendfd; + int appendseldb; char *pidfile; int bgsaveinprogress; + pid_t bgsavechildpid; struct saveparam *saveparams; int saveparamslen; char *logfile; char *bindaddr; char *dbfilename; + char *appendfilename; char *requirepass; int shareobjects; /* Replication related */ @@ -245,6 +281,8 @@ struct redisServer { int masterport; redisClient *master; /* client that is master for this slave */ int replstate; + unsigned int maxclients; + unsigned long maxmemory; /* Sort parameters - qsort_r() is only available under BSD so we * have to take this state global, in order to pass it to sortCompare() */ int sort_desc; @@ -260,6 +298,11 @@ struct redisCommand { int flags; }; +struct redisFunctionSym { + char *name; + unsigned long pointer; +}; + typedef struct _redisSortObject { robj *obj; union { @@ -273,6 +316,28 @@ typedef struct _redisSortOperation { robj *pattern; } redisSortOperation; +/* ZSETs use a specialized version of Skiplists */ + +typedef struct zskiplistNode { + struct zskiplistNode **forward; + struct zskiplistNode *backward; + double score; + robj *obj; +} zskiplistNode; + +typedef struct zskiplist { + struct zskiplistNode *header, *tail; + unsigned long length; + int level; +} zskiplist; + +typedef struct zset { + dict *dict; + zskiplist *zsl; +} zset; + +/* Our shared "common" objects */ + struct sharedObjectsStruct { robj *crlf, *ok, *err, *emptybulk, *czero, *cone, *pong, *space, *colon, *nullbulk, *nullmultibulk, @@ -282,6 +347,12 @@ struct sharedObjectsStruct { *select5, *select6, *select7, *select8, *select9; } shared; +/* Global vars that are actally used as constants. The following double + * values are used for double on-disk serialization, and are initialized + * at runtime to avoid strange compiler optimizations. */ + +static double R_Zero, R_PosInf, R_NegInf, R_Nan; + /*================================ Prototypes =============================== */ static void freeStringObject(robj *o); @@ -297,15 +368,27 @@ static void incrRefCount(robj *o); static int rdbSaveBackground(char *filename); static robj *createStringObject(char *ptr, size_t len); static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc); +static void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc); static int syncWithMaster(void); static robj *tryObjectSharing(robj *o); +static int tryObjectEncoding(robj *o); +static robj *getDecodedObject(const robj *o); static int removeExpire(redisDb *db, robj *key); static int expireIfNeeded(redisDb *db, robj *key); static int deleteIfVolatile(redisDb *db, robj *key); static int deleteKey(redisDb *db, robj *key); static time_t getExpire(redisDb *db, robj *key); static int setExpire(redisDb *db, robj *key, time_t when); -static void updateSalvesWaitingBgsave(int bgsaveerr); +static void updateSlavesWaitingBgsave(int bgsaveerr); +static void freeMemoryIfNeeded(void); +static int processCommand(redisClient *c); +static void setupSigSegvAction(void); +static void rdbRemoveTempFile(pid_t childpid); +static size_t stringObjectLen(robj *o); +static void processInputBuffer(redisClient *c); +static zskiplist *zslCreate(void); +static void zslFree(zskiplist *zsl); +static void zslInsert(zskiplist *zsl, double score, robj *obj); static void authCommand(redisClient *c); static void pingCommand(redisClient *c); @@ -345,6 +428,8 @@ static void sremCommand(redisClient *c); static void smoveCommand(redisClient *c); static void sismemberCommand(redisClient *c); static void scardCommand(redisClient *c); +static void spopCommand(redisClient *c); +static void srandmemberCommand(redisClient *c); static void sinterCommand(redisClient *c); static void sinterstoreCommand(redisClient *c); static void sunionCommand(redisClient *c); @@ -360,8 +445,21 @@ static void infoCommand(redisClient *c); static void mgetCommand(redisClient *c); static void monitorCommand(redisClient *c); static void expireCommand(redisClient *c); -static void getSetCommand(redisClient *c); +static void expireatCommand(redisClient *c); +static void getsetCommand(redisClient *c); static void ttlCommand(redisClient *c); +static void slaveofCommand(redisClient *c); +static void debugCommand(redisClient *c); +static void msetCommand(redisClient *c); +static void msetnxCommand(redisClient *c); +static void zaddCommand(redisClient *c); +static void zrangeCommand(redisClient *c); +static void zrangebyscoreCommand(redisClient *c); +static void zrevrangeCommand(redisClient *c); +static void zcardCommand(redisClient *c); +static void zremCommand(redisClient *c); +static void zscoreCommand(redisClient *c); +static void zremrangebyscoreCommand(redisClient *c); /*================================= Globals ================================= */ @@ -369,43 +467,57 @@ static void ttlCommand(redisClient *c); static struct redisServer server; /* server global state */ static struct redisCommand cmdTable[] = { {"get",getCommand,2,REDIS_CMD_INLINE}, - {"set",setCommand,3,REDIS_CMD_BULK}, - {"setnx",setnxCommand,3,REDIS_CMD_BULK}, + {"set",setCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, + {"setnx",setnxCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, {"del",delCommand,-2,REDIS_CMD_INLINE}, {"exists",existsCommand,2,REDIS_CMD_INLINE}, - {"incr",incrCommand,2,REDIS_CMD_INLINE}, - {"decr",decrCommand,2,REDIS_CMD_INLINE}, + {"incr",incrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, + {"decr",decrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, {"mget",mgetCommand,-2,REDIS_CMD_INLINE}, - {"rpush",rpushCommand,3,REDIS_CMD_BULK}, - {"lpush",lpushCommand,3,REDIS_CMD_BULK}, + {"rpush",rpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, + {"lpush",lpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, {"rpop",rpopCommand,2,REDIS_CMD_INLINE}, {"lpop",lpopCommand,2,REDIS_CMD_INLINE}, {"llen",llenCommand,2,REDIS_CMD_INLINE}, {"lindex",lindexCommand,3,REDIS_CMD_INLINE}, - {"lset",lsetCommand,4,REDIS_CMD_BULK}, + {"lset",lsetCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, {"lrange",lrangeCommand,4,REDIS_CMD_INLINE}, {"ltrim",ltrimCommand,4,REDIS_CMD_INLINE}, {"lrem",lremCommand,4,REDIS_CMD_BULK}, - {"sadd",saddCommand,3,REDIS_CMD_BULK}, + {"sadd",saddCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, {"srem",sremCommand,3,REDIS_CMD_BULK}, {"smove",smoveCommand,4,REDIS_CMD_BULK}, {"sismember",sismemberCommand,3,REDIS_CMD_BULK}, {"scard",scardCommand,2,REDIS_CMD_INLINE}, - {"sinter",sinterCommand,-2,REDIS_CMD_INLINE}, - {"sinterstore",sinterstoreCommand,-3,REDIS_CMD_INLINE}, - {"sunion",sunionCommand,-2,REDIS_CMD_INLINE}, - {"sunionstore",sunionstoreCommand,-3,REDIS_CMD_INLINE}, - {"sdiff",sdiffCommand,-2,REDIS_CMD_INLINE}, - {"sdiffstore",sdiffstoreCommand,-3,REDIS_CMD_INLINE}, + {"spop",spopCommand,2,REDIS_CMD_INLINE}, + {"srandmember",srandmemberCommand,2,REDIS_CMD_INLINE}, + {"sinter",sinterCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, + {"sinterstore",sinterstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, + {"sunion",sunionCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, + {"sunionstore",sunionstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, + {"sdiff",sdiffCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, + {"sdiffstore",sdiffstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, {"smembers",sinterCommand,2,REDIS_CMD_INLINE}, - {"incrby",incrbyCommand,3,REDIS_CMD_INLINE}, - {"decrby",decrbyCommand,3,REDIS_CMD_INLINE}, - {"getset",getSetCommand,3,REDIS_CMD_BULK}, + {"zadd",zaddCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, + {"zrem",zremCommand,3,REDIS_CMD_BULK}, + {"zremrangebyscore",zremrangebyscoreCommand,4,REDIS_CMD_INLINE}, + {"zrange",zrangeCommand,4,REDIS_CMD_INLINE}, + {"zrangebyscore",zrangebyscoreCommand,4,REDIS_CMD_INLINE}, + {"zrevrange",zrevrangeCommand,4,REDIS_CMD_INLINE}, + {"zcard",zcardCommand,2,REDIS_CMD_INLINE}, + {"zscore",zscoreCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, + {"incrby",incrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, + {"decrby",decrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, + {"getset",getsetCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, + {"mset",msetCommand,-3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, + {"msetnx",msetnxCommand,-3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM}, {"randomkey",randomkeyCommand,1,REDIS_CMD_INLINE}, {"select",selectCommand,2,REDIS_CMD_INLINE}, {"move",moveCommand,3,REDIS_CMD_INLINE}, {"rename",renameCommand,3,REDIS_CMD_INLINE}, {"renamenx",renamenxCommand,3,REDIS_CMD_INLINE}, + {"expire",expireCommand,3,REDIS_CMD_INLINE}, + {"expireat",expireatCommand,3,REDIS_CMD_INLINE}, {"keys",keysCommand,2,REDIS_CMD_INLINE}, {"dbsize",dbsizeCommand,1,REDIS_CMD_INLINE}, {"auth",authCommand,2,REDIS_CMD_INLINE}, @@ -419,14 +531,14 @@ static struct redisCommand cmdTable[] = { {"sync",syncCommand,1,REDIS_CMD_INLINE}, {"flushdb",flushdbCommand,1,REDIS_CMD_INLINE}, {"flushall",flushallCommand,1,REDIS_CMD_INLINE}, - {"sort",sortCommand,-2,REDIS_CMD_INLINE}, + {"sort",sortCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM}, {"info",infoCommand,1,REDIS_CMD_INLINE}, {"monitor",monitorCommand,1,REDIS_CMD_INLINE}, - {"expire",expireCommand,3,REDIS_CMD_INLINE}, {"ttl",ttlCommand,2,REDIS_CMD_INLINE}, + {"slaveof",slaveofCommand,3,REDIS_CMD_INLINE}, + {"debug",debugCommand,-2,REDIS_CMD_INLINE}, {NULL,NULL,0,0} }; - /*============================ Utility functions ============================ */ /* Glob-style pattern matching. */ @@ -552,8 +664,7 @@ int stringmatchlen(const char *pattern, int patternLen, return 0; } -void redisLog(int level, const char *fmt, ...) -{ +static void redisLog(int level, const char *fmt, ...) { va_list ap; FILE *fp; @@ -567,7 +678,7 @@ void redisLog(int level, const char *fmt, ...) time_t now; now = time(NULL); - strftime(buf,64,"%d %b %H:%M:%S",gmtime(&now)); + strftime(buf,64,"%d %b %H:%M:%S",localtime(&now)); fprintf(fp,"%s %c ",buf,c[level]); vfprintf(fp, fmt, ap); fprintf(fp,"\n"); @@ -584,6 +695,12 @@ void redisLog(int level, const char *fmt, ...) * keys and radis objects as values (objects can hold SDS strings, * lists, sets). */ +static void dictVanillaFree(void *privdata, void *val) +{ + DICT_NOTUSED(privdata); + zfree(val); +} + static int sdsDictKeyCompare(void *privdata, const void *key1, const void *key2) { @@ -603,32 +720,77 @@ static void dictRedisObjectDestructor(void *privdata, void *val) decrRefCount(val); } -static int dictSdsKeyCompare(void *privdata, const void *key1, +static int dictObjKeyCompare(void *privdata, const void *key1, const void *key2) { const robj *o1 = key1, *o2 = key2; return sdsDictKeyCompare(privdata,o1->ptr,o2->ptr); } -static unsigned int dictSdsHash(const void *key) { +static unsigned int dictObjHash(const void *key) { const robj *o = key; return dictGenHashFunction(o->ptr, sdslen((sds)o->ptr)); } +static int dictEncObjKeyCompare(void *privdata, const void *key1, + const void *key2) +{ + const robj *o1 = key1, *o2 = key2; + + if (o1->encoding == REDIS_ENCODING_RAW && + o2->encoding == REDIS_ENCODING_RAW) + return sdsDictKeyCompare(privdata,o1->ptr,o2->ptr); + else { + robj *dec1, *dec2; + int cmp; + + dec1 = o1->encoding != REDIS_ENCODING_RAW ? + getDecodedObject(o1) : (robj*)o1; + dec2 = o2->encoding != REDIS_ENCODING_RAW ? + getDecodedObject(o2) : (robj*)o2; + cmp = sdsDictKeyCompare(privdata,dec1->ptr,dec2->ptr); + if (dec1 != o1) decrRefCount(dec1); + if (dec2 != o2) decrRefCount(dec2); + return cmp; + } +} + +static unsigned int dictEncObjHash(const void *key) { + const robj *o = key; + + if (o->encoding == REDIS_ENCODING_RAW) + return dictGenHashFunction(o->ptr, sdslen((sds)o->ptr)); + else { + robj *dec = getDecodedObject(o); + unsigned int hash = dictGenHashFunction(dec->ptr, sdslen((sds)dec->ptr)); + decrRefCount(dec); + return hash; + } +} + static dictType setDictType = { - dictSdsHash, /* hash function */ + dictEncObjHash, /* hash function */ NULL, /* key dup */ NULL, /* val dup */ - dictSdsKeyCompare, /* key compare */ + dictEncObjKeyCompare, /* key compare */ dictRedisObjectDestructor, /* key destructor */ NULL /* val destructor */ }; +static dictType zsetDictType = { + dictEncObjHash, /* hash function */ + NULL, /* key dup */ + NULL, /* val dup */ + dictEncObjKeyCompare, /* key compare */ + dictRedisObjectDestructor, /* key destructor */ + dictVanillaFree /* val destructor */ +}; + static dictType hashDictType = { - dictSdsHash, /* hash function */ + dictObjHash, /* hash function */ NULL, /* key dup */ NULL, /* val dup */ - dictSdsKeyCompare, /* key compare */ + dictObjKeyCompare, /* key compare */ dictRedisObjectDestructor, /* key destructor */ dictRedisObjectDestructor /* val destructor */ }; @@ -648,7 +810,7 @@ static void oom(const char *msg) { } /* ====================== Redis server networking stuff ===================== */ -void closeTimedoutClients(void) { +static void closeTimedoutClients(void) { redisClient *c; listNode *ln; time_t now = time(NULL); @@ -665,26 +827,32 @@ void closeTimedoutClients(void) { } } +static int htNeedsResize(dict *dict) { + long long size, used; + + size = dictSlots(dict); + used = dictSize(dict); + return (size && used && size > DICT_HT_INITIAL_SIZE && + (used*100/size < REDIS_HT_MINFILL)); +} + /* If the percentage of used slots in the HT reaches REDIS_HT_MINFILL * we resize the hash table to save memory */ -void tryResizeHashTables(void) { +static void tryResizeHashTables(void) { int j; for (j = 0; j < server.dbnum; j++) { - long long size, used; - - size = dictSlots(server.db[j].dict); - used = dictSize(server.db[j].dict); - if (size && used && size > REDIS_HT_MINSLOTS && - (used*100/size < REDIS_HT_MINFILL)) { - redisLog(REDIS_NOTICE,"The hash table %d is too sparse, resize it...",j); + if (htNeedsResize(server.db[j].dict)) { + redisLog(REDIS_DEBUG,"The hash table %d is too sparse, resize it...",j); dictResize(server.db[j].dict); - redisLog(REDIS_NOTICE,"Hash table %d resized.",j); + redisLog(REDIS_DEBUG,"Hash table %d resized.",j); } + if (htNeedsResize(server.db[j].expires)) + dictResize(server.db[j].expires); } } -int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) { +static int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) { int j, loops = server.cronloops++; REDIS_NOTUSED(eventLoop); REDIS_NOTUSED(id); @@ -700,8 +868,8 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) { size = dictSlots(server.db[j].dict); used = dictSize(server.db[j].dict); vkeys = dictSize(server.db[j].expires); - if (!(loops % 5) && used > 0) { - redisLog(REDIS_DEBUG,"DB %d: %d keys (%d volatile) in %d slots HT.",j,used,vkeys,size); + if (!(loops % 5) && (used || vkeys)) { + redisLog(REDIS_DEBUG,"DB %d: %lld keys (%lld volatile) in %lld slots HT.",j,used,vkeys,size); /* dictPrintStats(server.dict); */ } } @@ -716,7 +884,7 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) { /* Show information about connected clients */ if (!(loops % 5)) { - redisLog(REDIS_DEBUG,"%d clients connected (%d slaves), %zu bytes in use", + redisLog(REDIS_DEBUG,"%d clients connected (%d slaves), %zu bytes in use, %d shared objects", listLength(server.clients)-listLength(server.slaves), listLength(server.slaves), server.usedmemory, @@ -730,20 +898,25 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) { /* Check if a background saving in progress terminated */ if (server.bgsaveinprogress) { int statloc; - /* XXX: TODO handle the case of the saving child killed */ if (wait4(-1,&statloc,WNOHANG,NULL)) { int exitcode = WEXITSTATUS(statloc); - if (exitcode == 0) { + int bysignal = WIFSIGNALED(statloc); + + if (!bysignal && exitcode == 0) { redisLog(REDIS_NOTICE, "Background saving terminated with success"); server.dirty = 0; server.lastsave = time(NULL); + } else if (!bysignal && exitcode != 0) { + redisLog(REDIS_WARNING, "Background saving error"); } else { redisLog(REDIS_WARNING, - "Background saving error"); + "Background saving terminated by signal"); + rdbRemoveTempFile(server.bgsavechildpid); } server.bgsaveinprogress = 0; - updateSalvesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR); + server.bgsavechildpid = -1; + updateSlavesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR); } } else { /* If there is not a background saving in progress check if @@ -834,7 +1007,6 @@ static void createSharedObjects(void) { static void appendServerSaveParams(time_t seconds, int changes) { server.saveparams = zrealloc(server.saveparams,sizeof(struct saveparam)*(server.saveparamslen+1)); - if (server.saveparams == NULL) oom("appendServerSaveParams"); server.saveparams[server.saveparamslen].seconds = seconds; server.saveparams[server.saveparamslen].changes = changes; server.saveparamslen++; @@ -856,10 +1028,17 @@ static void initServerConfig() { server.bindaddr = NULL; server.glueoutputbuf = 1; server.daemonize = 0; + server.appendonly = 0; + server.appendfd = -1; + server.appendseldb = -1; /* Make sure the first time will not match */ server.pidfile = "/var/run/redis.pid"; server.dbfilename = "dump.rdb"; + server.appendfilename = "appendonly.log"; server.requirepass = NULL; server.shareobjects = 0; + server.sharingpoolsize = 1024; + server.maxclients = 0; + server.maxmemory = 0; ResetServerSaveParams(); appendServerSaveParams(60*60,1); /* save after 1 hour and 1 change */ @@ -871,6 +1050,12 @@ static void initServerConfig() { server.masterport = 6379; server.master = NULL; server.replstate = REDIS_REPL_NONE; + + /* Double constants initialization */ + R_Zero = 0.0; + R_PosInf = 1.0/R_Zero; + R_NegInf = -1.0/R_Zero; + R_Nan = R_Zero/R_Zero; } static void initServer() { @@ -878,6 +1063,7 @@ static void initServer() { signal(SIGHUP, SIG_IGN); signal(SIGPIPE, SIG_IGN); + setupSigSegvAction(); server.clients = listCreate(); server.slaves = listCreate(); @@ -887,9 +1073,6 @@ static void initServer() { server.el = aeCreateEventLoop(); server.db = zmalloc(sizeof(redisDb)*server.dbnum); server.sharingpool = dictCreate(&setDictType,NULL); - server.sharingpoolsize = 1024; - if (!server.db || !server.clients || !server.slaves || !server.monitors || !server.el || !server.objfreelist) - oom("server initialization"); /* Fatal OOM */ server.fd = anetTcpServer(server.neterr, server.port, server.bindaddr); if (server.fd == -1) { redisLog(REDIS_WARNING, "Opening TCP port: %s", server.neterr); @@ -902,6 +1085,7 @@ static void initServer() { } server.cronloops = 0; server.bgsaveinprogress = 0; + server.bgsavechildpid = -1; server.lastsave = time(NULL); server.dirty = 0; server.usedmemory = 0; @@ -909,6 +1093,15 @@ static void initServer() { server.stat_numconnections = 0; server.stat_starttime = time(NULL); aeCreateTimeEvent(server.el, 1000, serverCron, NULL, NULL); + + if (server.appendonly) { + server.appendfd = open(server.appendfilename,O_WRONLY|O_APPEND|O_CREAT); + if (server.appendfd == -1) { + redisLog(REDIS_WARNING, "Can't open the append-only file: %s", + strerror(errno)); + exit(1); + } + } } /* Empty the whole database */ @@ -933,15 +1126,20 @@ static int yesnotoi(char *s) { /* I agree, this is a very rudimental way to load a configuration... will improve later if the config gets more complex */ static void loadServerConfig(char *filename) { - FILE *fp = fopen(filename,"r"); + FILE *fp; char buf[REDIS_CONFIGLINE_MAX+1], *err = NULL; int linenum = 0; sds line = NULL; - - if (!fp) { - redisLog(REDIS_WARNING,"Fatal error, can't open config file"); - exit(1); + + if (filename[0] == '-' && filename[1] == '\0') + fp = stdin; + else { + if ((fp = fopen(filename,"r")) == NULL) { + redisLog(REDIS_WARNING,"Fatal error, can't open config file"); + exit(1); + } } + while(fgets(buf,REDIS_CONFIGLINE_MAX+1,fp) != NULL) { sds *argv; int argc, j; @@ -995,7 +1193,7 @@ static void loadServerConfig(char *filename) { goto loaderr; } } else if (!strcasecmp(argv[0],"logfile") && argc == 2) { - FILE *fp; + FILE *logfp; server.logfile = zstrdup(argv[1]); if (!strcasecmp(server.logfile,"stdout")) { @@ -1005,19 +1203,23 @@ static void loadServerConfig(char *filename) { if (server.logfile) { /* Test if we are able to open the file. The server will not * be able to abort just for this problem later... */ - fp = fopen(server.logfile,"a"); - if (fp == NULL) { + logfp = fopen(server.logfile,"a"); + if (logfp == NULL) { err = sdscatprintf(sdsempty(), "Can't open the log file: %s", strerror(errno)); goto loaderr; } - fclose(fp); + fclose(logfp); } } else if (!strcasecmp(argv[0],"databases") && argc == 2) { server.dbnum = atoi(argv[1]); if (server.dbnum < 1) { err = "Invalid number of databases"; goto loaderr; } + } else if (!strcasecmp(argv[0],"maxclients") && argc == 2) { + server.maxclients = atoi(argv[1]); + } else if (!strcasecmp(argv[0],"maxmemory") && argc == 2) { + server.maxmemory = strtoll(argv[1], NULL, 10); } else if (!strcasecmp(argv[0],"slaveof") && argc == 3) { server.masterhost = sdsnew(argv[1]); server.masterport = atoi(argv[2]); @@ -1030,10 +1232,19 @@ static void loadServerConfig(char *filename) { if ((server.shareobjects = yesnotoi(argv[1])) == -1) { err = "argument must be 'yes' or 'no'"; goto loaderr; } + } else if (!strcasecmp(argv[0],"shareobjectspoolsize") && argc == 2) { + server.sharingpoolsize = atoi(argv[1]); + if (server.sharingpoolsize < 1) { + err = "invalid object sharing pool size"; goto loaderr; + } } else if (!strcasecmp(argv[0],"daemonize") && argc == 2) { if ((server.daemonize = yesnotoi(argv[1])) == -1) { err = "argument must be 'yes' or 'no'"; goto loaderr; } + } else if (!strcasecmp(argv[0],"appendonly") && argc == 2) { + if ((server.appendonly = yesnotoi(argv[1])) == -1) { + err = "argument must be 'yes' or 'no'"; goto loaderr; + } } else if (!strcasecmp(argv[0],"requirepass") && argc == 2) { server.requirepass = zstrdup(argv[1]); } else if (!strcasecmp(argv[0],"pidfile") && argc == 2) { @@ -1048,7 +1259,7 @@ static void loadServerConfig(char *filename) { zfree(argv); sdsfree(line); } - fclose(fp); + if (fp != stdin) fclose(fp); return; loaderr: @@ -1064,7 +1275,10 @@ static void freeClientArgv(redisClient *c) { for (j = 0; j < c->argc; j++) decrRefCount(c->argv[j]); + for (j = 0; j < c->mbargc; j++) + decrRefCount(c->mbargv[j]); c->argc = 0; + c->mbargc = 0; } static void freeClient(redisClient *c) { @@ -1092,6 +1306,7 @@ static void freeClient(redisClient *c) { server.replstate = REDIS_REPL_CONNECT; } zfree(c->argv); + zfree(c->mbargv); zfree(c); } @@ -1121,7 +1336,7 @@ static void glueReplyBuffersIfNeeded(redisClient *c) { } /* Now the output buffer is empty, add the new single element */ o = createObject(REDIS_STRING,sdsnewlen(buf,totlen)); - if (!listAddNodeTail(c->reply,o)) oom("listAddNodeTail"); + listAddNodeTail(c->reply,o); } } @@ -1144,6 +1359,7 @@ static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) } if (c->flags & REDIS_MASTER) { + /* Don't reply to a master */ nwritten = objlen - c->sentlen; } else { nwritten = write(fd, ((char*)o->ptr)+c->sentlen, objlen - c->sentlen); @@ -1156,6 +1372,12 @@ static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) listDelNode(c->reply,listFirst(c->reply)); c->sentlen = 0; } + /* Note that we avoid to send more thank REDIS_MAX_WRITE_PER_EVENT + * bytes, in a single threaded server it's a good idea to server + * other clients as well, even if a very large request comes from + * super fast link that is always able to accept data (in real world + * terms think to 'KEYS *' against the loopback interfae) */ + if (totwritten > REDIS_MAX_WRITE_PER_EVENT) break; } if (nwritten == -1) { if (errno == EAGAIN) { @@ -1187,6 +1409,7 @@ static struct redisCommand *lookupCommand(char *name) { static void resetClient(redisClient *c) { freeClientArgv(c); c->bulklen = -1; + c->multibulk = 0; } /* If this function gets called we already read a whole @@ -1201,6 +1424,77 @@ static int processCommand(redisClient *c) { struct redisCommand *cmd; long long dirty; + /* Free some memory if needed (maxmemory setting) */ + if (server.maxmemory) freeMemoryIfNeeded(); + + /* Handle the multi bulk command type. This is an alternative protocol + * supported by Redis in order to receive commands that are composed of + * multiple binary-safe "bulk" arguments. The latency of processing is + * a bit higher but this allows things like multi-sets, so if this + * protocol is used only for MSET and similar commands this is a big win. */ + if (c->multibulk == 0 && c->argc == 1 && ((char*)(c->argv[0]->ptr))[0] == '*') { + c->multibulk = atoi(((char*)c->argv[0]->ptr)+1); + if (c->multibulk <= 0) { + resetClient(c); + return 1; + } else { + decrRefCount(c->argv[c->argc-1]); + c->argc--; + return 1; + } + } else if (c->multibulk) { + if (c->bulklen == -1) { + if (((char*)c->argv[0]->ptr)[0] != '$') { + addReplySds(c,sdsnew("-ERR multi bulk protocol error\r\n")); + resetClient(c); + return 1; + } else { + int bulklen = atoi(((char*)c->argv[0]->ptr)+1); + decrRefCount(c->argv[0]); + if (bulklen < 0 || bulklen > 1024*1024*1024) { + c->argc--; + addReplySds(c,sdsnew("-ERR invalid bulk write count\r\n")); + resetClient(c); + return 1; + } + c->argc--; + c->bulklen = bulklen+2; /* add two bytes for CR+LF */ + return 1; + } + } else { + c->mbargv = zrealloc(c->mbargv,(sizeof(robj*))*(c->mbargc+1)); + c->mbargv[c->mbargc] = c->argv[0]; + c->mbargc++; + c->argc--; + c->multibulk--; + if (c->multibulk == 0) { + robj **auxargv; + int auxargc; + + /* Here we need to swap the multi-bulk argc/argv with the + * normal argc/argv of the client structure. */ + auxargv = c->argv; + c->argv = c->mbargv; + c->mbargv = auxargv; + + auxargc = c->argc; + c->argc = c->mbargc; + c->mbargc = auxargc; + + /* We need to set bulklen to something different than -1 + * in order for the code below to process the command without + * to try to read the last argument of a bulk command as + * a special argument. */ + c->bulklen = 0; + /* continue below and process the command */ + } else { + c->bulklen = -1; + return 1; + } + } + } + /* -- end of multi bulk commands processing -- */ + /* The QUIT command is handled as a special case. Normal command * procs are unable to close the client connection safely */ if (!strcasecmp(c->argv[0]->ptr,"quit")) { @@ -1217,6 +1511,10 @@ static int processCommand(redisClient *c) { addReplySds(c,sdsnew("-ERR wrong number of arguments\r\n")); resetClient(c); return 1; + } else if (server.maxmemory && cmd->flags & REDIS_CMD_DENYOOM && zmalloc_used_memory() > server.maxmemory) { + addReplySds(c,sdsnew("-ERR command not allowed when used memory > 'maxmemory'\r\n")); + resetClient(c); + return 1; } else if (cmd->flags & REDIS_CMD_BULK && c->bulklen == -1) { int bulklen = atoi(c->argv[c->argc-1]->ptr); @@ -1230,7 +1528,10 @@ static int processCommand(redisClient *c) { c->argc--; c->bulklen = bulklen+2; /* add two bytes for CR+LF */ /* It is possible that the bulk read is already in the - * buffer. Check this condition and handle it accordingly */ + * buffer. Check this condition and handle it accordingly. + * This is just a fast path, alternative to call processInputBuffer(). + * It's a good idea since the code is small and this condition + * happens most of the times. */ if ((signed)sdslen(c->querybuf) >= c->bulklen) { c->argv[c->argc] = createStringObject(c->querybuf,c->bulklen-2); c->argc++; @@ -1245,6 +1546,10 @@ static int processCommand(redisClient *c) { for(j = 1; j < c->argc; j++) c->argv[j] = tryObjectSharing(c->argv[j]); } + /* Let's try to encode the bulk object to save space. */ + if (cmd->flags & REDIS_CMD_BULK) + tryObjectEncoding(c->argv[c->argc-1]); + /* Check if the user is authenticated */ if (server.requirepass && !c->authenticated && cmd->proc != authCommand) { addReplySds(c,sdsnew("-ERR operation not permitted\r\n")); @@ -1255,6 +1560,8 @@ static int processCommand(redisClient *c) { /* Exec the command */ dirty = server.dirty; cmd->proc(c); + if (server.appendonly != 0) + feedAppendOnlyFile(cmd,c->db->id,c->argv,c->argc); if (server.dirty-dirty != 0 && listLength(server.slaves)) replicationFeedSlaves(server.slaves,cmd,c->db->id,c->argv,c->argc); if (listLength(server.monitors)) @@ -1281,7 +1588,6 @@ static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int di outv = static_outv; } else { outv = zmalloc(sizeof(robj*)*(argc*2+1)); - if (!outv) oom("replicationFeedSlaves"); } for (j = 0; j < argc; j++) { @@ -1290,7 +1596,8 @@ static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int di robj *lenobj; lenobj = createObject(REDIS_STRING, - sdscatprintf(sdsempty(),"%d\r\n",sdslen(argv[j]->ptr))); + sdscatprintf(sdsempty(),"%d\r\n", + stringObjectLen(argv[j]))); lenobj->refcount = 0; outv[outc++] = lenobj; } @@ -1339,39 +1646,61 @@ static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int di if (outv != static_outv) zfree(outv); } -static void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) { - redisClient *c = (redisClient*) privdata; - char buf[REDIS_IOBUF_LEN]; - int nread; - REDIS_NOTUSED(el); - REDIS_NOTUSED(mask); +/* TODO: translate EXPIREs into EXPIRETOs */ +static void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc) { + sds buf = sdsempty(); + int j; + ssize_t nwritten; - nread = read(fd, buf, REDIS_IOBUF_LEN); - if (nread == -1) { - if (errno == EAGAIN) { - nread = 0; - } else { - redisLog(REDIS_DEBUG, "Reading from client: %s",strerror(errno)); - freeClient(c); - return; - } - } else if (nread == 0) { - redisLog(REDIS_DEBUG, "Client closed connection"); - freeClient(c); - return; + /* The DB this command was targetting is not the same as the last command + * we appendend. To issue a SELECT command is needed. */ + if (dictid != server.appendseldb) { + char seldb[64]; + + snprintf(seldb,sizeof(seldb),"%d",dictid); + buf = sdscatprintf(buf,"*2\r\n$6\r\nSELECT\r\n$%d\r\n%s\r\n", + strlen(seldb),seldb); } - if (nread) { - c->querybuf = sdscatlen(c->querybuf, buf, nread); - c->lastinteraction = time(NULL); - } else { - return; + /* Append the actual command */ + buf = sdscatprintf(buf,"*%d\r\n",argc); + for (j = 0; j < argc; j++) { + robj *o = argv[j]; + + if (o->encoding != REDIS_ENCODING_RAW) + o = getDecodedObject(o); + buf = sdscatprintf(buf,"$%d\r\n",sdslen(o->ptr)); + buf = sdscatlen(buf,o->ptr,sdslen(o->ptr)); + buf = sdscatlen(buf,"\r\n",2); + if (o != argv[j]) + decrRefCount(o); } + /* We want to perform a single write. This should be guaranteed atomic + * at least if the filesystem we are writing is a real physical one. + * While this will save us against the server being killed I don't think + * there is much to do about the whole server stopping for power problems + * or alike */ + nwritten = write(server.appendfd,buf,sdslen(buf)); + if (nwritten != (unsigned)sdslen(buf)) { + /* Ooops, we are in troubles. The best thing to do for now is + * to simply exit instead to give the illusion that everything is + * working as expected. */ + if (nwritten == -1) { + redisLog(REDIS_WARNING,"Aborting on error writing to the append-only file: %s",strerror(errno)); + } else { + redisLog(REDIS_WARNING,"Aborting on short write while writing to the append-only file: %s",strerror(errno)); + } + abort(); + } + fsync(server.appendfd); /* Let's try to get this data on the disk */ +} +static void processInputBuffer(redisClient *c) { again: if (c->bulklen == -1) { /* Read the first line of the query */ char *p = strchr(c->querybuf,'\n'); size_t querylen; + if (p) { sds query, *argv; int argc, j; @@ -1394,12 +1723,10 @@ again: return; } argv = sdssplitlen(query,sdslen(query)," ",1,&argc); - if (argv == NULL) oom("sdssplitlen"); sdsfree(query); if (c->argv) zfree(c->argv); c->argv = zmalloc(sizeof(robj*)*argc); - if (c->argv == NULL) oom("allocating arguments list for client"); for (j = 0; j < argc; j++) { if (sdslen(argv[j])) { @@ -1413,9 +1740,9 @@ again: /* Execute the command. If the client is still valid * after processCommand() return and there is something * on the query buffer try to process the next command. */ - if (processCommand(c) && sdslen(c->querybuf)) goto again; + if (c->argc && processCommand(c) && sdslen(c->querybuf)) goto again; return; - } else if (sdslen(c->querybuf) >= 1024) { + } else if (sdslen(c->querybuf) >= REDIS_REQUEST_MAX_SIZE) { redisLog(REDIS_DEBUG, "Client protocol error"); freeClient(c); return; @@ -1432,10 +1759,43 @@ again: c->argv[c->argc] = createStringObject(c->querybuf,c->bulklen-2); c->argc++; c->querybuf = sdsrange(c->querybuf,c->bulklen,-1); - processCommand(c); + /* Process the command. If the client is still valid after + * the processing and there is more data in the buffer + * try to parse it. */ + if (processCommand(c) && sdslen(c->querybuf)) goto again; + return; + } + } +} + +static void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) { + redisClient *c = (redisClient*) privdata; + char buf[REDIS_IOBUF_LEN]; + int nread; + REDIS_NOTUSED(el); + REDIS_NOTUSED(mask); + + nread = read(fd, buf, REDIS_IOBUF_LEN); + if (nread == -1) { + if (errno == EAGAIN) { + nread = 0; + } else { + redisLog(REDIS_DEBUG, "Reading from client: %s",strerror(errno)); + freeClient(c); return; } + } else if (nread == 0) { + redisLog(REDIS_DEBUG, "Client closed connection"); + freeClient(c); + return; + } + if (nread) { + c->querybuf = sdscatlen(c->querybuf, buf, nread); + c->lastinteraction = time(NULL); + } else { + return; } + processInputBuffer(c); } static int selectDb(redisClient *c, int id) { @@ -1462,12 +1822,15 @@ static redisClient *createClient(int fd) { c->argc = 0; c->argv = NULL; c->bulklen = -1; + c->multibulk = 0; + c->mbargc = 0; + c->mbargv = NULL; c->sentlen = 0; c->flags = 0; c->lastinteraction = time(NULL); c->authenticated = 0; c->replstate = REDIS_REPL_NONE; - if ((c->reply = listCreate()) == NULL) oom("listCreate"); + c->reply = listCreate(); listSetFreeMethod(c->reply,decrRefCount); listSetDupMethod(c->reply,dupClientReplyValue); if (aeCreateFileEvent(server.el, c->fd, AE_READABLE, @@ -1475,7 +1838,7 @@ static redisClient *createClient(int fd) { freeClient(c); return NULL; } - if (!listAddNodeTail(server.clients,c)) oom("listAddNodeTail"); + listAddNodeTail(server.clients,c); return c; } @@ -1485,8 +1848,12 @@ static void addReply(redisClient *c, robj *obj) { c->replstate == REDIS_REPL_ONLINE) && aeCreateFileEvent(server.el, c->fd, AE_WRITABLE, sendReplyToClient, c, NULL) == AE_ERR) return; - if (!listAddNodeTail(c->reply,obj)) oom("listAddNodeTail"); - incrRefCount(obj); + if (obj->encoding != REDIS_ENCODING_RAW) { + obj = getDecodedObject(obj); + } else { + incrRefCount(obj); + } + listAddNodeTail(c->reply,obj); } static void addReplySds(redisClient *c, sds s) { @@ -1495,9 +1862,30 @@ static void addReplySds(redisClient *c, sds s) { decrRefCount(o); } +static void addReplyBulkLen(redisClient *c, robj *obj) { + size_t len; + + if (obj->encoding == REDIS_ENCODING_RAW) { + len = sdslen(obj->ptr); + } else { + long n = (long)obj->ptr; + + len = 1; + if (n < 0) { + len++; + n = -n; + } + while((n = n/10) != 0) { + len++; + } + } + addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",len)); +} + static void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) { int cport, cfd; char cip[128]; + redisClient *c; REDIS_NOTUSED(el); REDIS_NOTUSED(mask); REDIS_NOTUSED(privdata); @@ -1508,11 +1896,23 @@ static void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) { return; } redisLog(REDIS_DEBUG,"Accepted %s:%d", cip, cport); - if (createClient(cfd) == NULL) { + if ((c = createClient(cfd)) == NULL) { redisLog(REDIS_WARNING,"Error allocating resoures for the client"); close(cfd); /* May be already closed, just ingore errors */ return; } + /* If maxclient directive is set and this is one client more... close the + * connection. Note that we create the client instead to check before + * for this condition, since now the socket is already set in nonblocking + * mode and we can send an error for free using the Kernel I/O */ + if (server.maxclients && listLength(server.clients) > server.maxclients) { + char *err = "-ERR max number of clients reached\r\n"; + + /* That's a best effort error message, don't check write errors */ + (void) write(c->fd,err,strlen(err)); + freeClient(c); + return; + } server.stat_numconnections++; } @@ -1528,8 +1928,8 @@ static robj *createObject(int type, void *ptr) { } else { o = zmalloc(sizeof(*o)); } - if (!o) oom("createObject"); o->type = type; + o->encoding = REDIS_ENCODING_RAW; o->ptr = ptr; o->refcount = 1; return o; @@ -1542,19 +1942,27 @@ static robj *createStringObject(char *ptr, size_t len) { static robj *createListObject(void) { list *l = listCreate(); - if (!l) oom("listCreate"); listSetFreeMethod(l,decrRefCount); return createObject(REDIS_LIST,l); } static robj *createSetObject(void) { dict *d = dictCreate(&setDictType,NULL); - if (!d) oom("dictCreate"); return createObject(REDIS_SET,d); } +static robj *createZsetObject(void) { + zset *zs = zmalloc(sizeof(*zs)); + + zs->dict = dictCreate(&zsetDictType,NULL); + zs->zsl = zslCreate(); + return createObject(REDIS_ZSET,zs); +} + static void freeStringObject(robj *o) { - sdsfree(o->ptr); + if (o->encoding == REDIS_ENCODING_RAW) { + sdsfree(o->ptr); + } } static void freeListObject(robj *o) { @@ -1565,6 +1973,14 @@ static void freeSetObject(robj *o) { dictRelease((dict*) o->ptr); } +static void freeZsetObject(robj *o) { + zset *zs = o->ptr; + + dictRelease(zs->dict); + zslFree(zs->zsl); + zfree(zs); +} + static void freeHashObject(robj *o) { dictRelease((dict*) o->ptr); } @@ -1589,6 +2005,7 @@ static void decrRefCount(void *obj) { case REDIS_STRING: freeStringObject(o); break; case REDIS_LIST: freeListObject(o); break; case REDIS_SET: freeSetObject(o); break; + case REDIS_ZSET: freeZsetObject(o); break; case REDIS_HASH: freeHashObject(o); break; default: assert(0 != 0); break; } @@ -1598,6 +2015,36 @@ static void decrRefCount(void *obj) { } } +static robj *lookupKey(redisDb *db, robj *key) { + dictEntry *de = dictFind(db->dict,key); + return de ? dictGetEntryVal(de) : NULL; +} + +static robj *lookupKeyRead(redisDb *db, robj *key) { + expireIfNeeded(db,key); + return lookupKey(db,key); +} + +static robj *lookupKeyWrite(redisDb *db, robj *key) { + deleteIfVolatile(db,key); + return lookupKey(db,key); +} + +static int deleteKey(redisDb *db, robj *key) { + int retval; + + /* We need to protect key from destruction: after the first dictDelete() + * it may happen that 'key' is no longer valid if we don't increment + * it's count. This may happen when we get the object reference directly + * from the hash table with dictRandomKey() or dict iterators */ + incrRefCount(key); + if (dictSize(db->expires)) dictDelete(db->expires,key); + retval = dictDelete(db->dict,key); + decrRefCount(key); + + return retval == DICT_OK; +} + /* Try to share an object against the shared objects pool */ static robj *tryObjectSharing(robj *o) { struct dictEntry *de; @@ -1643,34 +2090,106 @@ static robj *tryObjectSharing(robj *o) { } } -static robj *lookupKey(redisDb *db, robj *key) { - dictEntry *de = dictFind(db->dict,key); - return de ? dictGetEntryVal(de) : NULL; +/* Check if the nul-terminated string 's' can be represented by a long + * (that is, is a number that fits into long without any other space or + * character before or after the digits). + * + * If so, the function returns REDIS_OK and *longval is set to the value + * of the number. Otherwise REDIS_ERR is returned */ +static int isStringRepresentableAsLong(sds s, long *longval) { + char buf[32], *endptr; + long value; + int slen; + + value = strtol(s, &endptr, 10); + if (endptr[0] != '\0') return REDIS_ERR; + slen = snprintf(buf,32,"%ld",value); + + /* If the number converted back into a string is not identical + * then it's not possible to encode the string as integer */ + if (sdslen(s) != (unsigned)slen || memcmp(buf,s,slen)) return REDIS_ERR; + if (longval) *longval = value; + return REDIS_OK; } -static robj *lookupKeyRead(redisDb *db, robj *key) { - expireIfNeeded(db,key); - return lookupKey(db,key); +/* Try to encode a string object in order to save space */ +static int tryObjectEncoding(robj *o) { + long value; + sds s = o->ptr; + + if (o->encoding != REDIS_ENCODING_RAW) + return REDIS_ERR; /* Already encoded */ + + /* It's not save to encode shared objects: shared objects can be shared + * everywhere in the "object space" of Redis. Encoded objects can only + * appear as "values" (and not, for instance, as keys) */ + if (o->refcount > 1) return REDIS_ERR; + + /* Currently we try to encode only strings */ + assert(o->type == REDIS_STRING); + + /* Check if we can represent this string as a long integer */ + if (isStringRepresentableAsLong(s,&value) == REDIS_ERR) return REDIS_ERR; + + /* Ok, this object can be encoded */ + o->encoding = REDIS_ENCODING_INT; + sdsfree(o->ptr); + o->ptr = (void*) value; + return REDIS_OK; } -static robj *lookupKeyWrite(redisDb *db, robj *key) { - deleteIfVolatile(db,key); - return lookupKey(db,key); +/* Get a decoded version of an encoded object (returned as a new object) */ +static robj *getDecodedObject(const robj *o) { + robj *dec; + + assert(o->encoding != REDIS_ENCODING_RAW); + if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_INT) { + char buf[32]; + + snprintf(buf,32,"%ld",(long)o->ptr); + dec = createStringObject(buf,strlen(buf)); + return dec; + } else { + assert(1 != 1); + } } -static int deleteKey(redisDb *db, robj *key) { - int retval; +/* Compare two string objects via strcmp() or alike. + * Note that the objects may be integer-encoded. In such a case we + * use snprintf() to get a string representation of the numbers on the stack + * and compare the strings, it's much faster than calling getDecodedObject(). */ +static int compareStringObjects(robj *a, robj *b) { + assert(a->type == REDIS_STRING && b->type == REDIS_STRING); + char bufa[128], bufb[128], *astr, *bstr; + int bothsds = 1; - /* We need to protect key from destruction: after the first dictDelete() - * it may happen that 'key' is no longer valid if we don't increment - * it's count. This may happen when we get the object reference directly - * from the hash table with dictRandomKey() or dict iterators */ - incrRefCount(key); - if (dictSize(db->expires)) dictDelete(db->expires,key); - retval = dictDelete(db->dict,key); - decrRefCount(key); + if (a == b) return 0; + if (a->encoding != REDIS_ENCODING_RAW) { + snprintf(bufa,sizeof(bufa),"%ld",(long) a->ptr); + astr = bufa; + bothsds = 0; + } else { + astr = a->ptr; + } + if (b->encoding != REDIS_ENCODING_RAW) { + snprintf(bufb,sizeof(bufb),"%ld",(long) b->ptr); + bstr = bufb; + bothsds = 0; + } else { + bstr = b->ptr; + } + return bothsds ? sdscmp(astr,bstr) : strcmp(astr,bstr); +} - return retval == DICT_OK; +static size_t stringObjectLen(robj *o) { + assert(o->type == REDIS_STRING); + if (o->encoding == REDIS_ENCODING_RAW) { + return sdslen(o->ptr); + } else { + char buf[32]; + + return snprintf(buf,32,"%ld",(long)o->ptr); + } } /*============================ DB saving/loading ============================ */ @@ -1712,7 +2231,7 @@ static int rdbSaveLen(FILE *fp, uint32_t len) { /* String objects in the form "2391" "-100" without any space and with a * range of values that can fit in an 8, 16 or 32 bit signed value can be * encoded as integers to save space */ -int rdbTryIntegerEncoding(sds s, unsigned char *enc) { +static int rdbTryIntegerEncoding(sds s, unsigned char *enc) { long long value; char *endptr, buf[32]; @@ -1777,10 +2296,12 @@ writeerr: /* Save a string objet as [len][data] on disk. If the object is a string * representation of an integer value we try to safe it in a special form */ -static int rdbSaveStringObject(FILE *fp, robj *obj) { - size_t len = sdslen(obj->ptr); +static int rdbSaveStringObjectRaw(FILE *fp, robj *obj) { + size_t len; int enclen; + len = sdslen(obj->ptr); + /* Try integer encoding */ if (len <= 11) { unsigned char buf[5]; @@ -1792,7 +2313,7 @@ static int rdbSaveStringObject(FILE *fp, robj *obj) { /* Try LZF compression - under 20 bytes it's unable to compress even * aaaaaaaaaaaaaaaaaa so skip it */ - if (1 && len > 20) { + if (len > 20) { int retval; retval = rdbSaveLzfStringObject(fp,obj); @@ -1807,6 +2328,48 @@ static int rdbSaveStringObject(FILE *fp, robj *obj) { return 0; } +/* Like rdbSaveStringObjectRaw() but handle encoded objects */ +static int rdbSaveStringObject(FILE *fp, robj *obj) { + int retval; + robj *dec; + + if (obj->encoding != REDIS_ENCODING_RAW) { + dec = getDecodedObject(obj); + retval = rdbSaveStringObjectRaw(fp,dec); + decrRefCount(dec); + return retval; + } else { + return rdbSaveStringObjectRaw(fp,obj); + } +} + +/* Save a double value. Doubles are saved as strings prefixed by an unsigned + * 8 bit integer specifing the length of the representation. + * This 8 bit integer has special values in order to specify the following + * conditions: + * 253: not a number + * 254: + inf + * 255: - inf + */ +static int rdbSaveDoubleValue(FILE *fp, double val) { + unsigned char buf[128]; + int len; + + if (isnan(val)) { + buf[0] = 253; + len = 1; + } else if (!isfinite(val)) { + len = 1; + buf[0] = (val < 0) ? 255 : 254; + } else { + snprintf((char*)buf+1,sizeof(buf)-1,"%.16g",val); + buf[0] = strlen((char*)buf); + len = buf[0]+1; + } + if (fwrite(buf,len,1,fp) == 0) return -1; + return 0; +} + /* Save the DB on disk. Return REDIS_ERR on error, REDIS_OK on success */ static int rdbSave(char *filename) { dictIterator *di = NULL; @@ -1816,7 +2379,7 @@ static int rdbSave(char *filename) { int j; time_t now = time(NULL); - snprintf(tmpfile,256,"temp-%d.%ld.rdb",(int)time(NULL),(long int)random()); + snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid()); fp = fopen(tmpfile,"w"); if (!fp) { redisLog(REDIS_WARNING, "Failed saving the DB: %s", strerror(errno)); @@ -1874,7 +2437,6 @@ static int rdbSave(char *filename) { dictIterator *di = dictGetIterator(set); dictEntry *de; - if (!set) oom("dictGetIteraotr"); if (rdbSaveLen(fp,dictSize(set)) == -1) goto werr; while((de = dictNext(di)) != NULL) { robj *eleobj = dictGetEntryKey(de); @@ -1882,6 +2444,21 @@ static int rdbSave(char *filename) { if (rdbSaveStringObject(fp,eleobj) == -1) goto werr; } dictReleaseIterator(di); + } else if (o->type == REDIS_ZSET) { + /* Save a set value */ + zset *zs = o->ptr; + dictIterator *di = dictGetIterator(zs->dict); + dictEntry *de; + + if (rdbSaveLen(fp,dictSize(zs->dict)) == -1) goto werr; + while((de = dictNext(di)) != NULL) { + robj *eleobj = dictGetEntryKey(de); + double *score = dictGetEntryVal(de); + + if (rdbSaveStringObject(fp,eleobj) == -1) goto werr; + if (rdbSaveDoubleValue(fp,*score) == -1) goto werr; + } + dictReleaseIterator(di); } else { assert(0 != 0); } @@ -1899,7 +2476,7 @@ static int rdbSave(char *filename) { /* Use RENAME to make sure the DB file is changed atomically only * if the generate DB file is ok. */ if (rename(tmpfile,filename) == -1) { - redisLog(REDIS_WARNING,"Error moving temp DB file on the final destionation: %s", strerror(errno)); + redisLog(REDIS_WARNING,"Error moving temp DB file on the final destination: %s", strerror(errno)); unlink(tmpfile); return REDIS_ERR; } @@ -1937,11 +2514,19 @@ static int rdbSaveBackground(char *filename) { } redisLog(REDIS_NOTICE,"Background saving started by pid %d",childpid); server.bgsaveinprogress = 1; + server.bgsavechildpid = childpid; return REDIS_OK; } return REDIS_OK; /* unreached */ } +static void rdbRemoveTempFile(pid_t childpid) { + char tmpfile[256]; + + snprintf(tmpfile,256,"temp-%d.rdb", (int) childpid); + unlink(tmpfile); +} + static int rdbLoadType(FILE *fp) { unsigned char type; if (fread(&type,1,1,fp) == 0) return -1; @@ -2062,6 +2647,23 @@ static robj *rdbLoadStringObject(FILE*fp, int rdbver) { return tryObjectSharing(createObject(REDIS_STRING,val)); } +/* For information about double serialization check rdbSaveDoubleValue() */ +static int rdbLoadDoubleValue(FILE *fp, double *val) { + char buf[128]; + unsigned char len; + + if (fread(&len,1,1,fp) == 0) return -1; + switch(len) { + case 255: *val = R_NegInf; return 0; + case 254: *val = R_PosInf; return 0; + case 253: *val = R_Nan; return 0; + default: + if (fread(buf,len,1,fp) == 0) return -1; + sscanf(buf, "%lg", val); + return 0; + } +} + static int rdbLoad(char *filename) { FILE *fp; robj *keyobj = NULL; @@ -2116,6 +2718,7 @@ static int rdbLoad(char *filename) { if (type == REDIS_STRING) { /* Read string value */ if ((o = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr; + tryObjectEncoding(o); } else if (type == REDIS_LIST || type == REDIS_SET) { /* Read list/set value */ uint32_t listlen; @@ -2128,14 +2731,34 @@ static int rdbLoad(char *filename) { robj *ele; if ((ele = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr; + tryObjectEncoding(ele); if (type == REDIS_LIST) { - if (!listAddNodeTail((list*)o->ptr,ele)) - oom("listAddNodeTail"); + listAddNodeTail((list*)o->ptr,ele); } else { - if (dictAdd((dict*)o->ptr,ele,NULL) == DICT_ERR) - oom("dictAdd"); + dictAdd((dict*)o->ptr,ele,NULL); } } + } else if (type == REDIS_ZSET) { + /* Read list/set value */ + uint32_t zsetlen; + zset *zs; + + if ((zsetlen = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR) + goto eoferr; + o = createZsetObject(); + zs = o->ptr; + /* Load every single element of the list/set */ + while(zsetlen--) { + robj *ele; + double *score = zmalloc(sizeof(double)); + + if ((ele = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr; + tryObjectEncoding(ele); + if (rdbLoadDoubleValue(fp,score) == -1) goto eoferr; + dictAdd(zs->dict,ele,score); + zslInsert(zs->zsl,*score,ele); + incrRefCount(ele); /* added to skiplist */ + } } else { assert(0 != 0); } @@ -2172,7 +2795,7 @@ static void authCommand(redisClient *c) { addReply(c,shared.ok); } else { c->authenticated = 0; - addReply(c,shared.err); + addReplySds(c,sdscatprintf(sdsempty(),"-ERR invalid password\r\n")); } } @@ -2181,8 +2804,7 @@ static void pingCommand(redisClient *c) { } static void echoCommand(redisClient *c) { - addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n", - (int)sdslen(c->argv[1]->ptr))); + addReplyBulkLen(c,c->argv[1]); addReply(c,c->argv[1]); addReply(c,shared.crlf); } @@ -2227,14 +2849,14 @@ static void getCommand(redisClient *c) { if (o->type != REDIS_STRING) { addReply(c,shared.wrongtypeerr); } else { - addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(o->ptr))); + addReplyBulkLen(c,o); addReply(c,o); addReply(c,shared.crlf); } } } -static void getSetCommand(redisClient *c) { +static void getsetCommand(redisClient *c) { getCommand(c); if (dictAdd(c->db->dict,c->argv[1],c->argv[2]) == DICT_ERR) { dictReplace(c->db->dict,c->argv[1],c->argv[2]); @@ -2258,7 +2880,7 @@ static void mgetCommand(redisClient *c) { if (o->type != REDIS_STRING) { addReply(c,shared.nullbulk); } else { - addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(o->ptr))); + addReplyBulkLen(c,o); addReply(c,o); addReply(c,shared.crlf); } @@ -2280,12 +2902,18 @@ static void incrDecrCommand(redisClient *c, long long incr) { } else { char *eptr; - value = strtoll(o->ptr, &eptr, 10); + if (o->encoding == REDIS_ENCODING_RAW) + value = strtoll(o->ptr, &eptr, 10); + else if (o->encoding == REDIS_ENCODING_INT) + value = (long)o->ptr; + else + assert(1 != 1); } } value += incr; o = createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",value)); + tryObjectEncoding(o); retval = dictAdd(c->db->dict,c->argv[1],o); if (retval == DICT_ERR) { dictReplace(c->db->dict,c->argv[1],o); @@ -2381,7 +3009,6 @@ static void keysCommand(redisClient *c) { robj *lenobj = createObject(REDIS_STRING,NULL); di = dictGetIterator(c->db->dict); - if (!di) oom("dictGetIterator"); addReply(c,lenobj); decrRefCount(lenobj); while((de = dictNext(di)) != NULL) { @@ -2459,15 +3086,26 @@ static void bgsaveCommand(redisClient *c) { static void shutdownCommand(redisClient *c) { redisLog(REDIS_WARNING,"User requested shutdown, saving DB..."); - /* XXX: TODO kill the child if there is a bgsave in progress */ + /* Kill the saving child if there is a background saving in progress. + We want to avoid race conditions, for instance our saving child may + overwrite the synchronous saving did by SHUTDOWN. */ + if (server.bgsaveinprogress) { + redisLog(REDIS_WARNING,"There is a live saving child. Killing it!"); + kill(server.bgsavechildpid,SIGKILL); + rdbRemoveTempFile(server.bgsavechildpid); + } + /* SYNC SAVE */ if (rdbSave(server.dbfilename) == REDIS_OK) { - if (server.daemonize) { + if (server.daemonize) unlink(server.pidfile); - } redisLog(REDIS_WARNING,"%zu bytes used at exit",zmalloc_used_memory()); redisLog(REDIS_WARNING,"Server exit now, bye bye..."); exit(1); } else { + /* Ooops.. error saving! The best we can do is to continue operating. + * Note that if there was a background saving process, in the next + * cron() Redis will be notified that the background saving aborted, + * handling special stuff like slaves pending for synchronization... */ redisLog(REDIS_WARNING,"Error trying to save the DB, can't exit"); addReplySds(c,sdsnew("-ERR can't quit, problems saving the DB\r\n")); } @@ -2566,9 +3204,9 @@ static void pushGenericCommand(redisClient *c, int where) { lobj = createListObject(); list = lobj->ptr; if (where == REDIS_HEAD) { - if (!listAddNodeHead(list,c->argv[2])) oom("listAddNodeHead"); + listAddNodeHead(list,c->argv[2]); } else { - if (!listAddNodeTail(list,c->argv[2])) oom("listAddNodeTail"); + listAddNodeTail(list,c->argv[2]); } dictAdd(c->db->dict,c->argv[1],lobj); incrRefCount(c->argv[1]); @@ -2580,9 +3218,9 @@ static void pushGenericCommand(redisClient *c, int where) { } list = lobj->ptr; if (where == REDIS_HEAD) { - if (!listAddNodeHead(list,c->argv[2])) oom("listAddNodeHead"); + listAddNodeHead(list,c->argv[2]); } else { - if (!listAddNodeTail(list,c->argv[2])) oom("listAddNodeTail"); + listAddNodeTail(list,c->argv[2]); } incrRefCount(c->argv[2]); } @@ -2635,7 +3273,7 @@ static void lindexCommand(redisClient *c) { addReply(c,shared.nullbulk); } else { robj *ele = listNodeValue(ln); - addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(ele->ptr))); + addReplyBulkLen(c,ele); addReply(c,ele); addReply(c,shared.crlf); } @@ -2695,7 +3333,7 @@ static void popGenericCommand(redisClient *c, int where) { addReply(c,shared.nullbulk); } else { robj *ele = listNodeValue(ln); - addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(ele->ptr))); + addReplyBulkLen(c,ele); addReply(c,ele); addReply(c,shared.crlf); listDelNode(list,ln); @@ -2751,7 +3389,7 @@ static void lrangeCommand(redisClient *c) { addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",rangelen)); for (j = 0; j < rangelen; j++) { ele = listNodeValue(ln); - addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(ele->ptr))); + addReplyBulkLen(c,ele); addReply(c,ele); addReply(c,shared.crlf); ln = ln->next; @@ -2803,8 +3441,8 @@ static void ltrimCommand(redisClient *c) { ln = listLast(list); listDelNode(list,ln); } - addReply(c,shared.ok); server.dirty++; + addReply(c,shared.ok); } } } @@ -2814,7 +3452,7 @@ static void lremCommand(redisClient *c) { o = lookupKeyWrite(c->db,c->argv[1]); if (o == NULL) { - addReply(c,shared.nokeyerr); + addReply(c,shared.czero); } else { if (o->type != REDIS_LIST) { addReply(c,shared.wrongtypeerr); @@ -2834,7 +3472,7 @@ static void lremCommand(redisClient *c) { robj *ele = listNodeValue(ln); next = fromtail ? ln->prev : ln->next; - if (sdscmp(ele->ptr,c->argv[3]->ptr) == 0) { + if (compareStringObjects(ele,c->argv[3]) == 0) { listDelNode(list,ln); server.dirty++; removed++; @@ -2885,6 +3523,7 @@ static void sremCommand(redisClient *c) { } if (dictDelete(set->ptr,c->argv[2]) == DICT_OK) { server.dirty++; + if (htNeedsResize(set->ptr)) dictResize(set->ptr); addReply(c,shared.cone); } else { addReply(c,shared.czero); @@ -2964,6 +3603,59 @@ static void scardCommand(redisClient *c) { } } +static void spopCommand(redisClient *c) { + robj *set; + dictEntry *de; + + set = lookupKeyWrite(c->db,c->argv[1]); + if (set == NULL) { + addReply(c,shared.nullbulk); + } else { + if (set->type != REDIS_SET) { + addReply(c,shared.wrongtypeerr); + return; + } + de = dictGetRandomKey(set->ptr); + if (de == NULL) { + addReply(c,shared.nullbulk); + } else { + robj *ele = dictGetEntryKey(de); + + addReplyBulkLen(c,ele); + addReply(c,ele); + addReply(c,shared.crlf); + dictDelete(set->ptr,ele); + if (htNeedsResize(set->ptr)) dictResize(set->ptr); + server.dirty++; + } + } +} + +static void srandmemberCommand(redisClient *c) { + robj *set; + dictEntry *de; + + set = lookupKeyRead(c->db,c->argv[1]); + if (set == NULL) { + addReply(c,shared.nullbulk); + } else { + if (set->type != REDIS_SET) { + addReply(c,shared.wrongtypeerr); + return; + } + de = dictGetRandomKey(set->ptr); + if (de == NULL) { + addReply(c,shared.nullbulk); + } else { + robj *ele = dictGetEntryKey(de); + + addReplyBulkLen(c,ele); + addReply(c,ele); + addReply(c,shared.crlf); + } + } +} + static int qsortCompareSetsByCardinality(const void *s1, const void *s2) { dict **d1 = (void*) s1, **d2 = (void*) s2; @@ -2977,7 +3669,6 @@ static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, r robj *lenobj = NULL, *dstset = NULL; int j, cardinality = 0; - if (!dv) oom("sinterGenericCommand"); for (j = 0; j < setsnum; j++) { robj *setobj; @@ -3024,7 +3715,6 @@ static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, r * the element against all the other sets, if at least one set does * not include the element it is discarded */ di = dictGetIterator(dv[0]); - if (!di) oom("dictGetIterator"); while((de = dictNext(di)) != NULL) { robj *ele; @@ -3035,7 +3725,7 @@ static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, r continue; /* at least one set does not contain the member */ ele = dictGetEntryKey(de); if (!dstkey) { - addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",sdslen(ele->ptr))); + addReplyBulkLen(c,ele); addReply(c,ele); addReply(c,shared.crlf); cardinality++; @@ -3081,7 +3771,6 @@ static void sunionDiffGenericCommand(redisClient *c, robj **setskeys, int setsnu robj *dstset = NULL; int j, cardinality = 0; - if (!dv) oom("sunionDiffGenericCommand"); for (j = 0; j < setsnum; j++) { robj *setobj; @@ -3112,7 +3801,6 @@ static void sunionDiffGenericCommand(redisClient *c, robj **setskeys, int setsnu if (!dv[j]) continue; /* non existing keys are like empty sets */ di = dictGetIterator(dv[j]); - if (!di) oom("dictGetIterator"); while((de = dictNext(di)) != NULL) { robj *ele; @@ -3139,13 +3827,11 @@ static void sunionDiffGenericCommand(redisClient *c, robj **setskeys, int setsnu if (!dstkey) { addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",cardinality)); di = dictGetIterator(dstset->ptr); - if (!di) oom("dictGetIterator"); while((de = dictNext(di)) != NULL) { robj *ele; ele = dictGetEntryKey(de); - addReplySds(c,sdscatprintf(sdsempty(), - "$%d\r\n",sdslen(ele->ptr))); + addReplyBulkLen(c,ele); addReply(c,ele); addReply(c,shared.crlf); } @@ -3185,6 +3871,482 @@ static void sdiffstoreCommand(redisClient *c) { sunionDiffGenericCommand(c,c->argv+2,c->argc-2,c->argv[1],REDIS_OP_DIFF); } +/* ==================================== ZSets =============================== */ + +/* ZSETs are ordered sets using two data structures to hold the same elements + * in order to get O(log(N)) INSERT and REMOVE operations into a sorted + * data structure. + * + * The elements are added to an hash table mapping Redis objects to scores. + * At the same time the elements are added to a skip list mapping scores + * to Redis objects (so objects are sorted by scores in this "view"). */ + +/* This skiplist implementation is almost a C translation of the original + * algorithm described by William Pugh in "Skip Lists: A Probabilistic + * Alternative to Balanced Trees", modified in three ways: + * a) this implementation allows for repeated values. + * b) the comparison is not just by key (our 'score') but by satellite data. + * c) there is a back pointer, so it's a doubly linked list with the back + * pointers being only at "level 1". This allows to traverse the list + * from tail to head, useful for ZREVRANGE. */ + +static zskiplistNode *zslCreateNode(int level, double score, robj *obj) { + zskiplistNode *zn = zmalloc(sizeof(*zn)); + + zn->forward = zmalloc(sizeof(zskiplistNode*) * level); + zn->score = score; + zn->obj = obj; + return zn; +} + +static zskiplist *zslCreate(void) { + int j; + zskiplist *zsl; + + zsl = zmalloc(sizeof(*zsl)); + zsl->level = 1; + zsl->length = 0; + zsl->header = zslCreateNode(ZSKIPLIST_MAXLEVEL,0,NULL); + for (j = 0; j < ZSKIPLIST_MAXLEVEL; j++) + zsl->header->forward[j] = NULL; + zsl->header->backward = NULL; + zsl->tail = NULL; + return zsl; +} + +static void zslFreeNode(zskiplistNode *node) { + decrRefCount(node->obj); + zfree(node->forward); + zfree(node); +} + +static void zslFree(zskiplist *zsl) { + zskiplistNode *node = zsl->header->forward[0], *next; + + zfree(zsl->header->forward); + zfree(zsl->header); + while(node) { + next = node->forward[0]; + zslFreeNode(node); + node = next; + } + zfree(zsl); +} + +static int zslRandomLevel(void) { + int level = 1; + while ((random()&0xFFFF) < (ZSKIPLIST_P * 0xFFFF)) + level += 1; + return level; +} + +static void zslInsert(zskiplist *zsl, double score, robj *obj) { + zskiplistNode *update[ZSKIPLIST_MAXLEVEL], *x; + int i, level; + + x = zsl->header; + for (i = zsl->level-1; i >= 0; i--) { + while (x->forward[i] && + (x->forward[i]->score < score || + (x->forward[i]->score == score && + compareStringObjects(x->forward[i]->obj,obj) < 0))) + x = x->forward[i]; + update[i] = x; + } + /* we assume the key is not already inside, since we allow duplicated + * scores, and the re-insertion of score and redis object should never + * happpen since the caller of zslInsert() should test in the hash table + * if the element is already inside or not. */ + level = zslRandomLevel(); + if (level > zsl->level) { + for (i = zsl->level; i < level; i++) + update[i] = zsl->header; + zsl->level = level; + } + x = zslCreateNode(level,score,obj); + for (i = 0; i < level; i++) { + x->forward[i] = update[i]->forward[i]; + update[i]->forward[i] = x; + } + x->backward = (update[0] == zsl->header) ? NULL : update[0]; + if (x->forward[0]) + x->forward[0]->backward = x; + else + zsl->tail = x; + zsl->length++; +} + +/* Delete an element with matching score/object from the skiplist. */ +static int zslDelete(zskiplist *zsl, double score, robj *obj) { + zskiplistNode *update[ZSKIPLIST_MAXLEVEL], *x; + int i; + + x = zsl->header; + for (i = zsl->level-1; i >= 0; i--) { + while (x->forward[i] && + (x->forward[i]->score < score || + (x->forward[i]->score == score && + compareStringObjects(x->forward[i]->obj,obj) < 0))) + x = x->forward[i]; + update[i] = x; + } + /* We may have multiple elements with the same score, what we need + * is to find the element with both the right score and object. */ + x = x->forward[0]; + if (x && score == x->score && compareStringObjects(x->obj,obj) == 0) { + for (i = 0; i < zsl->level; i++) { + if (update[i]->forward[i] != x) break; + update[i]->forward[i] = x->forward[i]; + } + if (x->forward[0]) { + x->forward[0]->backward = (x->backward == zsl->header) ? + NULL : x->backward; + } else { + zsl->tail = x->backward; + } + zslFreeNode(x); + while(zsl->level > 1 && zsl->header->forward[zsl->level-1] == NULL) + zsl->level--; + zsl->length--; + return 1; + } else { + return 0; /* not found */ + } + return 0; /* not found */ +} + +/* Delete all the elements with score between min and max from the skiplist. + * Min and mx are inclusive, so a score >= min || score <= max is deleted. + * Note that this function takes the reference to the hash table view of the + * sorted set, in order to remove the elements from the hash table too. */ +static unsigned long zslDeleteRange(zskiplist *zsl, double min, double max, dict *dict) { + zskiplistNode *update[ZSKIPLIST_MAXLEVEL], *x; + unsigned long removed = 0; + int i; + + x = zsl->header; + for (i = zsl->level-1; i >= 0; i--) { + while (x->forward[i] && x->forward[i]->score < min) + x = x->forward[i]; + update[i] = x; + } + /* We may have multiple elements with the same score, what we need + * is to find the element with both the right score and object. */ + x = x->forward[0]; + while (x && x->score <= max) { + zskiplistNode *next; + + for (i = 0; i < zsl->level; i++) { + if (update[i]->forward[i] != x) break; + update[i]->forward[i] = x->forward[i]; + } + if (x->forward[0]) { + x->forward[0]->backward = (x->backward == zsl->header) ? + NULL : x->backward; + } else { + zsl->tail = x->backward; + } + next = x->forward[0]; + dictDelete(dict,x->obj); + zslFreeNode(x); + while(zsl->level > 1 && zsl->header->forward[zsl->level-1] == NULL) + zsl->level--; + zsl->length--; + removed++; + x = next; + } + return removed; /* not found */ +} + +/* Find the first node having a score equal or greater than the specified one. + * Returns NULL if there is no match. */ +static zskiplistNode *zslFirstWithScore(zskiplist *zsl, double score) { + zskiplistNode *x; + int i; + + x = zsl->header; + for (i = zsl->level-1; i >= 0; i--) { + while (x->forward[i] && x->forward[i]->score < score) + x = x->forward[i]; + } + /* We may have multiple elements with the same score, what we need + * is to find the element with both the right score and object. */ + return x->forward[0]; +} + +/* The actual Z-commands implementations */ + +static void zaddCommand(redisClient *c) { + robj *zsetobj; + zset *zs; + double *score; + + zsetobj = lookupKeyWrite(c->db,c->argv[1]); + if (zsetobj == NULL) { + zsetobj = createZsetObject(); + dictAdd(c->db->dict,c->argv[1],zsetobj); + incrRefCount(c->argv[1]); + } else { + if (zsetobj->type != REDIS_ZSET) { + addReply(c,shared.wrongtypeerr); + return; + } + } + score = zmalloc(sizeof(double)); + *score = strtod(c->argv[2]->ptr,NULL); + zs = zsetobj->ptr; + if (dictAdd(zs->dict,c->argv[3],score) == DICT_OK) { + /* case 1: New element */ + incrRefCount(c->argv[3]); /* added to hash */ + zslInsert(zs->zsl,*score,c->argv[3]); + incrRefCount(c->argv[3]); /* added to skiplist */ + server.dirty++; + addReply(c,shared.cone); + } else { + dictEntry *de; + double *oldscore; + + /* case 2: Score update operation */ + de = dictFind(zs->dict,c->argv[3]); + assert(de != NULL); + oldscore = dictGetEntryVal(de); + if (*score != *oldscore) { + int deleted; + + deleted = zslDelete(zs->zsl,*oldscore,c->argv[3]); + assert(deleted != 0); + zslInsert(zs->zsl,*score,c->argv[3]); + incrRefCount(c->argv[3]); + dictReplace(zs->dict,c->argv[3],score); + server.dirty++; + } else { + zfree(score); + } + addReply(c,shared.czero); + } +} + +static void zremCommand(redisClient *c) { + robj *zsetobj; + zset *zs; + + zsetobj = lookupKeyWrite(c->db,c->argv[1]); + if (zsetobj == NULL) { + addReply(c,shared.czero); + } else { + dictEntry *de; + double *oldscore; + int deleted; + + if (zsetobj->type != REDIS_ZSET) { + addReply(c,shared.wrongtypeerr); + return; + } + zs = zsetobj->ptr; + de = dictFind(zs->dict,c->argv[2]); + if (de == NULL) { + addReply(c,shared.czero); + return; + } + /* Delete from the skiplist */ + oldscore = dictGetEntryVal(de); + deleted = zslDelete(zs->zsl,*oldscore,c->argv[2]); + assert(deleted != 0); + + /* Delete from the hash table */ + dictDelete(zs->dict,c->argv[2]); + if (htNeedsResize(zs->dict)) dictResize(zs->dict); + server.dirty++; + addReply(c,shared.cone); + } +} + +static void zremrangebyscoreCommand(redisClient *c) { + double min = strtod(c->argv[2]->ptr,NULL); + double max = strtod(c->argv[3]->ptr,NULL); + robj *zsetobj; + zset *zs; + + zsetobj = lookupKeyWrite(c->db,c->argv[1]); + if (zsetobj == NULL) { + addReply(c,shared.czero); + } else { + long deleted; + + if (zsetobj->type != REDIS_ZSET) { + addReply(c,shared.wrongtypeerr); + return; + } + zs = zsetobj->ptr; + deleted = zslDeleteRange(zs->zsl,min,max,zs->dict); + if (htNeedsResize(zs->dict)) dictResize(zs->dict); + server.dirty += deleted; + addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",deleted)); + } +} + +static void zrangeGenericCommand(redisClient *c, int reverse) { + robj *o; + int start = atoi(c->argv[2]->ptr); + int end = atoi(c->argv[3]->ptr); + + o = lookupKeyRead(c->db,c->argv[1]); + if (o == NULL) { + addReply(c,shared.nullmultibulk); + } else { + if (o->type != REDIS_ZSET) { + addReply(c,shared.wrongtypeerr); + } else { + zset *zsetobj = o->ptr; + zskiplist *zsl = zsetobj->zsl; + zskiplistNode *ln; + + int llen = zsl->length; + int rangelen, j; + robj *ele; + + /* convert negative indexes */ + if (start < 0) start = llen+start; + if (end < 0) end = llen+end; + if (start < 0) start = 0; + if (end < 0) end = 0; + + /* indexes sanity checks */ + if (start > end || start >= llen) { + /* Out of range start or start > end result in empty list */ + addReply(c,shared.emptymultibulk); + return; + } + if (end >= llen) end = llen-1; + rangelen = (end-start)+1; + + /* Return the result in form of a multi-bulk reply */ + if (reverse) { + ln = zsl->tail; + while (start--) + ln = ln->backward; + } else { + ln = zsl->header->forward[0]; + while (start--) + ln = ln->forward[0]; + } + + addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",rangelen)); + for (j = 0; j < rangelen; j++) { + ele = ln->obj; + addReplyBulkLen(c,ele); + addReply(c,ele); + addReply(c,shared.crlf); + ln = reverse ? ln->backward : ln->forward[0]; + } + } + } +} + +static void zrangeCommand(redisClient *c) { + zrangeGenericCommand(c,0); +} + +static void zrevrangeCommand(redisClient *c) { + zrangeGenericCommand(c,1); +} + +static void zrangebyscoreCommand(redisClient *c) { + robj *o; + double min = strtod(c->argv[2]->ptr,NULL); + double max = strtod(c->argv[3]->ptr,NULL); + + o = lookupKeyRead(c->db,c->argv[1]); + if (o == NULL) { + addReply(c,shared.nullmultibulk); + } else { + if (o->type != REDIS_ZSET) { + addReply(c,shared.wrongtypeerr); + } else { + zset *zsetobj = o->ptr; + zskiplist *zsl = zsetobj->zsl; + zskiplistNode *ln; + robj *ele, *lenobj; + unsigned int rangelen = 0; + + /* Get the first node with the score >= min */ + ln = zslFirstWithScore(zsl,min); + if (ln == NULL) { + /* No element matching the speciifed interval */ + addReply(c,shared.emptymultibulk); + return; + } + + /* We don't know in advance how many matching elements there + * are in the list, so we push this object that will represent + * the multi-bulk length in the output buffer, and will "fix" + * it later */ + lenobj = createObject(REDIS_STRING,NULL); + addReply(c,lenobj); + + while(ln && ln->score <= max) { + ele = ln->obj; + addReplyBulkLen(c,ele); + addReply(c,ele); + addReply(c,shared.crlf); + ln = ln->forward[0]; + rangelen++; + } + lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",rangelen); + } + } +} + +static void zcardCommand(redisClient *c) { + robj *o; + zset *zs; + + o = lookupKeyRead(c->db,c->argv[1]); + if (o == NULL) { + addReply(c,shared.czero); + return; + } else { + if (o->type != REDIS_ZSET) { + addReply(c,shared.wrongtypeerr); + } else { + zs = o->ptr; + addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",zs->zsl->length)); + } + } +} + +static void zscoreCommand(redisClient *c) { + robj *o; + zset *zs; + + o = lookupKeyRead(c->db,c->argv[1]); + if (o == NULL) { + addReply(c,shared.czero); + return; + } else { + if (o->type != REDIS_ZSET) { + addReply(c,shared.wrongtypeerr); + } else { + dictEntry *de; + + zs = o->ptr; + de = dictFind(zs->dict,c->argv[2]); + if (!de) { + addReply(c,shared.nullbulk); + } else { + char buf[128]; + double *score = dictGetEntryVal(de); + + snprintf(buf,sizeof(buf),"%.16g",*score); + addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n%s\r\n", + strlen(buf),buf)); + } + } + } +} + +/* ========================= Non type-specific commands ==================== */ + static void flushdbCommand(redisClient *c) { server.dirty += dictSize(c->db->dict); dictEmpty(c->db->dict); @@ -3199,9 +4361,8 @@ static void flushallCommand(redisClient *c) { server.dirty++; } -redisSortOperation *createSortOperation(int type, robj *pattern) { +static redisSortOperation *createSortOperation(int type, robj *pattern) { redisSortOperation *so = zmalloc(sizeof(*so)); - if (!so) oom("createSortOperation"); so->type = type; so->pattern = pattern; return so; @@ -3209,7 +4370,7 @@ redisSortOperation *createSortOperation(int type, robj *pattern) { /* Return the value associated to the key with a name obtained * substituting the first occurence of '*' in 'pattern' with 'subst' */ -robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) { +static robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) { char *p; sds spat, ssub; robj keyobj; @@ -3221,6 +4382,12 @@ robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) { char buf[REDIS_SORTKEY_MAX+1]; } keyname; + if (subst->encoding == REDIS_ENCODING_RAW) + incrRefCount(subst); + else { + subst = getDecodedObject(subst); + } + spat = pattern->ptr; ssub = subst->ptr; if (sdslen(spat)+sdslen(ssub)-1 > REDIS_SORTKEY_MAX) return NULL; @@ -3240,6 +4407,8 @@ robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) { keyobj.type = REDIS_STRING; keyobj.ptr = ((char*)&keyname)+(sizeof(long)*2); + decrRefCount(subst); + /* printf("lookup '%s' => %p\n", keyname.buf,de); */ return lookupKeyRead(db,&keyobj); } @@ -3277,7 +4446,20 @@ static int sortCompare(const void *s1, const void *s2) { } } else { /* Compare elements directly */ - cmp = strcoll(so1->obj->ptr,so2->obj->ptr); + if (so1->obj->encoding == REDIS_ENCODING_RAW && + so2->obj->encoding == REDIS_ENCODING_RAW) { + cmp = strcoll(so1->obj->ptr,so2->obj->ptr); + } else { + robj *dec1, *dec2; + + dec1 = so1->obj->encoding == REDIS_ENCODING_RAW ? + so1->obj : getDecodedObject(so1->obj); + dec2 = so2->obj->encoding == REDIS_ENCODING_RAW ? + so2->obj : getDecodedObject(so2->obj); + cmp = strcoll(dec1->ptr,dec2->ptr); + if (dec1 != so1->obj) decrRefCount(dec1); + if (dec2 != so2->obj) decrRefCount(dec2); + } } } return server.sort_desc ? -cmp : cmp; @@ -3367,7 +4549,6 @@ static void sortCommand(redisClient *c) { listLength((list*)sortval->ptr) : dictSize((dict*)sortval->ptr); vector = zmalloc(sizeof(redisSortObject)*vectorlen); - if (!vector) oom("allocating objects vector for SORT"); j = 0; if (sortval->type == REDIS_LIST) { list *list = sortval->ptr; @@ -3387,7 +4568,6 @@ static void sortCommand(redisClient *c) { dictEntry *setele; di = dictGetIterator(set); - if (!di) oom("dictGetIterator"); while((setele = dictNext(di)) != NULL) { vector[j].obj = dictGetEntryKey(setele); vector[j].u.score = 0; @@ -3407,13 +4587,33 @@ static void sortCommand(redisClient *c) { byval = lookupKeyByPattern(c->db,sortby,vector[j].obj); if (!byval || byval->type != REDIS_STRING) continue; if (alpha) { - vector[j].u.cmpobj = byval; - incrRefCount(byval); + if (byval->encoding == REDIS_ENCODING_RAW) { + vector[j].u.cmpobj = byval; + incrRefCount(byval); + } else { + vector[j].u.cmpobj = getDecodedObject(byval); + } } else { - vector[j].u.score = strtod(byval->ptr,NULL); + if (byval->encoding == REDIS_ENCODING_RAW) { + vector[j].u.score = strtod(byval->ptr,NULL); + } else { + if (byval->encoding == REDIS_ENCODING_INT) { + vector[j].u.score = (long)byval->ptr; + } else + assert(1 != 1); + } } } else { - if (!alpha) vector[j].u.score = strtod(vector[j].obj->ptr,NULL); + if (!alpha) { + if (vector[j].obj->encoding == REDIS_ENCODING_RAW) + vector[j].u.score = strtod(vector[j].obj->ptr,NULL); + else { + if (vector[j].obj->encoding == REDIS_ENCODING_INT) + vector[j].u.score = (long) vector[j].obj->ptr; + else + assert(1 != 1); + } + } } } } @@ -3445,8 +4645,7 @@ static void sortCommand(redisClient *c) { for (j = start; j <= end; j++) { listNode *ln; if (!getop) { - addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n", - sdslen(vector[j].obj->ptr))); + addReplyBulkLen(c,vector[j].obj); addReply(c,vector[j].obj); addReply(c,shared.crlf); } @@ -3460,8 +4659,7 @@ static void sortCommand(redisClient *c) { if (!val || val->type != REDIS_STRING) { addReply(c,shared.nullbulk); } else { - addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n", - sdslen(val->ptr))); + addReplyBulkLen(c,val); addReply(c,val); addReply(c,shared.crlf); } @@ -3484,9 +4682,13 @@ static void sortCommand(redisClient *c) { static void infoCommand(redisClient *c) { sds info; time_t uptime = time(NULL)-server.stat_starttime; + int j; info = sdscatprintf(sdsempty(), "redis_version:%s\r\n" + "arch_bits:%s\r\n" + "uptime_in_seconds:%d\r\n" + "uptime_in_days:%d\r\n" "connected_clients:%d\r\n" "connected_slaves:%d\r\n" "used_memory:%zu\r\n" @@ -3495,9 +4697,11 @@ static void infoCommand(redisClient *c) { "last_save_time:%d\r\n" "total_connections_received:%lld\r\n" "total_commands_processed:%lld\r\n" - "uptime_in_seconds:%d\r\n" - "uptime_in_days:%d\r\n" + "role:%s\r\n" ,REDIS_VERSION, + (sizeof(long) == 8) ? "64" : "32", + uptime, + uptime/(3600*24), listLength(server.clients)-listLength(server.slaves), listLength(server.slaves), server.usedmemory, @@ -3506,9 +4710,31 @@ static void infoCommand(redisClient *c) { server.lastsave, server.stat_numconnections, server.stat_numcommands, - uptime, - uptime/(3600*24) + server.masterhost == NULL ? "master" : "slave" ); + if (server.masterhost) { + info = sdscatprintf(info, + "master_host:%s\r\n" + "master_port:%d\r\n" + "master_link_status:%s\r\n" + "master_last_io_seconds_ago:%d\r\n" + ,server.masterhost, + server.masterport, + (server.replstate == REDIS_REPL_CONNECTED) ? + "up" : "down", + server.master ? ((int)(time(NULL)-server.master->lastinteraction)) : -1 + ); + } + for (j = 0; j < server.dbnum; j++) { + long long keys, vkeys; + + keys = dictSize(server.db[j].dict); + vkeys = dictSize(server.db[j].expires); + if (keys || vkeys) { + info = sdscatprintf(info, "db%d: keys=%lld,expires=%lld\r\n", + j, keys, vkeys); + } + } addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",sdslen(info))); addReplySds(c,info); addReply(c,shared.crlf); @@ -3520,7 +4746,7 @@ static void monitorCommand(redisClient *c) { c->flags |= (REDIS_SLAVE|REDIS_MONITOR); c->slaveseldb = 0; - if (!listAddNodeTail(server.monitors,c)) oom("listAddNodeTail"); + listAddNodeTail(server.monitors,c); addReply(c,shared.ok); } @@ -3584,28 +4810,38 @@ static int deleteIfVolatile(redisDb *db, robj *key) { return dictDelete(db->dict,key) == DICT_OK; } -static void expireCommand(redisClient *c) { +static void expireGenericCommand(redisClient *c, robj *key, time_t seconds) { dictEntry *de; - int seconds = atoi(c->argv[2]->ptr); - de = dictFind(c->db->dict,c->argv[1]); + de = dictFind(c->db->dict,key); if (de == NULL) { addReply(c,shared.czero); return; } - if (seconds <= 0) { - addReply(c, shared.czero); + if (seconds < 0) { + if (deleteKey(c->db,key)) server.dirty++; + addReply(c, shared.cone); return; } else { time_t when = time(NULL)+seconds; - if (setExpire(c->db,c->argv[1],when)) + if (setExpire(c->db,key,when)) { addReply(c,shared.cone); - else + server.dirty++; + } else { addReply(c,shared.czero); + } return; } } +static void expireCommand(redisClient *c) { + expireGenericCommand(c,c->argv[1],strtol(c->argv[2]->ptr,NULL,10)); +} + +static void expireatCommand(redisClient *c) { + expireGenericCommand(c,c->argv[1],strtol(c->argv[2]->ptr,NULL,10)-time(NULL)); +} + static void ttlCommand(redisClient *c) { time_t expire; int ttl = -1; @@ -3618,6 +4854,49 @@ static void ttlCommand(redisClient *c) { addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",ttl)); } +static void msetGenericCommand(redisClient *c, int nx) { + int j; + + if ((c->argc % 2) == 0) { + addReplySds(c,sdsnew("-ERR wrong number of arguments\r\n")); + return; + } + /* Handle the NX flag. The MSETNX semantic is to return zero and don't + * set nothing at all if at least one already key exists. */ + if (nx) { + for (j = 1; j < c->argc; j += 2) { + if (dictFind(c->db->dict,c->argv[j]) != NULL) { + addReply(c, shared.czero); + return; + } + } + } + + for (j = 1; j < c->argc; j += 2) { + int retval; + + retval = dictAdd(c->db->dict,c->argv[j],c->argv[j+1]); + if (retval == DICT_ERR) { + dictReplace(c->db->dict,c->argv[j],c->argv[j+1]); + incrRefCount(c->argv[j+1]); + } else { + incrRefCount(c->argv[j]); + incrRefCount(c->argv[j+1]); + } + removeExpire(c->db,c->argv[j]); + } + server.dirty += (c->argc-1)/2; + addReply(c, nx ? shared.cone : shared.ok); +} + +static void msetCommand(redisClient *c) { + msetGenericCommand(c,0); +} + +static void msetnxCommand(redisClient *c) { + msetGenericCommand(c,1); +} + /* =============================== Replication ============================= */ static int syncWrite(int fd, char *ptr, ssize_t size, int timeout) { @@ -3715,7 +4994,6 @@ static void syncCommand(redisClient *c) { * another slave. Set the right state, and copy the buffer. */ listRelease(c->reply); c->reply = listDup(slave->reply); - if (!c->reply) oom("listDup copying slave reply list"); c->replstate = REDIS_REPL_WAIT_BGSAVE_END; redisLog(REDIS_NOTICE,"Waiting for end of BGSAVE for SYNC"); } else { @@ -3737,7 +5015,7 @@ static void syncCommand(redisClient *c) { c->repldbfd = -1; c->flags |= REDIS_SLAVE; c->slaveseldb = 0; - if (!listAddNodeTail(server.slaves,c)) oom("listAddNodeTail"); + listAddNodeTail(server.slaves,c); return; } @@ -3795,7 +5073,13 @@ static void sendBulkToSlave(aeEventLoop *el, int fd, void *privdata, int mask) { } } -static void updateSalvesWaitingBgsave(int bgsaveerr) { +/* This function is called at the end of every backgrond saving. + * The argument bgsaveerr is REDIS_OK if the background saving succeeded + * otherwise REDIS_ERR is passed to the function. + * + * The goal of this function is to handle slaves waiting for a successful + * background saving in order to perform non-blocking synchronization. */ +static void updateSlavesWaitingBgsave(int bgsaveerr) { listNode *ln; int startbgsave = 0; @@ -3807,7 +5091,7 @@ static void updateSalvesWaitingBgsave(int bgsaveerr) { startbgsave = 1; slave->replstate = REDIS_REPL_WAIT_BGSAVE_END; } else if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_END) { - struct stat buf; + struct redis_stat buf; if (bgsaveerr != REDIS_OK) { freeClient(slave); @@ -3815,7 +5099,7 @@ static void updateSalvesWaitingBgsave(int bgsaveerr) { continue; } if ((slave->repldbfd = open(server.dbfilename,O_RDONLY)) == -1 || - fstat(slave->repldbfd,&buf) == -1) { + redis_fstat(slave->repldbfd,&buf) == -1) { freeClient(slave); redisLog(REDIS_WARNING,"SYNC failed. Can't open/stat DB after BGSAVE: %s", strerror(errno)); continue; @@ -3869,6 +5153,11 @@ static int syncWithMaster(void) { strerror(errno)); return REDIS_ERR; } + if (buf[0] != '$') { + close(fd); + redisLog(REDIS_WARNING,"Bad protocol from MASTER, the first byte is not '$', are you sure the host and port are right?"); + return REDIS_ERR; + } dumpsize = atoi(buf+1); redisLog(REDIS_NOTICE,"Receiving %d bytes data dump from MASTER",dumpsize); /* Read the bulk write data on a temp file */ @@ -3918,6 +5207,346 @@ static int syncWithMaster(void) { return REDIS_OK; } +static void slaveofCommand(redisClient *c) { + if (!strcasecmp(c->argv[1]->ptr,"no") && + !strcasecmp(c->argv[2]->ptr,"one")) { + if (server.masterhost) { + sdsfree(server.masterhost); + server.masterhost = NULL; + if (server.master) freeClient(server.master); + server.replstate = REDIS_REPL_NONE; + redisLog(REDIS_NOTICE,"MASTER MODE enabled (user request)"); + } + } else { + sdsfree(server.masterhost); + server.masterhost = sdsdup(c->argv[1]->ptr); + server.masterport = atoi(c->argv[2]->ptr); + if (server.master) freeClient(server.master); + server.replstate = REDIS_REPL_CONNECT; + redisLog(REDIS_NOTICE,"SLAVE OF %s:%d enabled (user request)", + server.masterhost, server.masterport); + } + addReply(c,shared.ok); +} + +/* ============================ Maxmemory directive ======================== */ + +/* This function gets called when 'maxmemory' is set on the config file to limit + * the max memory used by the server, and we are out of memory. + * This function will try to, in order: + * + * - Free objects from the free list + * - Try to remove keys with an EXPIRE set + * + * It is not possible to free enough memory to reach used-memory < maxmemory + * the server will start refusing commands that will enlarge even more the + * memory usage. + */ +static void freeMemoryIfNeeded(void) { + while (server.maxmemory && zmalloc_used_memory() > server.maxmemory) { + if (listLength(server.objfreelist)) { + robj *o; + + listNode *head = listFirst(server.objfreelist); + o = listNodeValue(head); + listDelNode(server.objfreelist,head); + zfree(o); + } else { + int j, k, freed = 0; + + for (j = 0; j < server.dbnum; j++) { + int minttl = -1; + robj *minkey = NULL; + struct dictEntry *de; + + if (dictSize(server.db[j].expires)) { + freed = 1; + /* From a sample of three keys drop the one nearest to + * the natural expire */ + for (k = 0; k < 3; k++) { + time_t t; + + de = dictGetRandomKey(server.db[j].expires); + t = (time_t) dictGetEntryVal(de); + if (minttl == -1 || t < minttl) { + minkey = dictGetEntryKey(de); + minttl = t; + } + } + deleteKey(server.db+j,minkey); + } + } + if (!freed) return; /* nothing to free... */ + } + } +} + +/* ================================= Debugging ============================== */ + +static void debugCommand(redisClient *c) { + if (!strcasecmp(c->argv[1]->ptr,"segfault")) { + *((char*)-1) = 'x'; + } else if (!strcasecmp(c->argv[1]->ptr,"object") && c->argc == 3) { + dictEntry *de = dictFind(c->db->dict,c->argv[2]); + robj *key, *val; + + if (!de) { + addReply(c,shared.nokeyerr); + return; + } + key = dictGetEntryKey(de); + val = dictGetEntryVal(de); + addReplySds(c,sdscatprintf(sdsempty(), + "+Key at:%p refcount:%d, value at:%p refcount:%d encoding:%d\r\n", + key, key->refcount, val, val->refcount, val->encoding)); + } else { + addReplySds(c,sdsnew( + "-ERR Syntax error, try DEBUG [SEGFAULT|OBJECT ]\r\n")); + } +} + +#ifdef HAVE_BACKTRACE +static struct redisFunctionSym symsTable[] = { +{"compareStringObjects", (unsigned long)compareStringObjects}, +{"isStringRepresentableAsLong", (unsigned long)isStringRepresentableAsLong}, +{"dictEncObjKeyCompare", (unsigned long)dictEncObjKeyCompare}, +{"dictEncObjHash", (unsigned long)dictEncObjHash}, +{"incrDecrCommand", (unsigned long)incrDecrCommand}, +{"freeStringObject", (unsigned long)freeStringObject}, +{"freeListObject", (unsigned long)freeListObject}, +{"freeSetObject", (unsigned long)freeSetObject}, +{"decrRefCount", (unsigned long)decrRefCount}, +{"createObject", (unsigned long)createObject}, +{"freeClient", (unsigned long)freeClient}, +{"rdbLoad", (unsigned long)rdbLoad}, +{"rdbSaveStringObject", (unsigned long)rdbSaveStringObject}, +{"rdbSaveStringObjectRaw", (unsigned long)rdbSaveStringObjectRaw}, +{"addReply", (unsigned long)addReply}, +{"addReplySds", (unsigned long)addReplySds}, +{"incrRefCount", (unsigned long)incrRefCount}, +{"rdbSaveBackground", (unsigned long)rdbSaveBackground}, +{"createStringObject", (unsigned long)createStringObject}, +{"replicationFeedSlaves", (unsigned long)replicationFeedSlaves}, +{"syncWithMaster", (unsigned long)syncWithMaster}, +{"tryObjectSharing", (unsigned long)tryObjectSharing}, +{"tryObjectEncoding", (unsigned long)tryObjectEncoding}, +{"getDecodedObject", (unsigned long)getDecodedObject}, +{"removeExpire", (unsigned long)removeExpire}, +{"expireIfNeeded", (unsigned long)expireIfNeeded}, +{"deleteIfVolatile", (unsigned long)deleteIfVolatile}, +{"deleteKey", (unsigned long)deleteKey}, +{"getExpire", (unsigned long)getExpire}, +{"setExpire", (unsigned long)setExpire}, +{"updateSlavesWaitingBgsave", (unsigned long)updateSlavesWaitingBgsave}, +{"freeMemoryIfNeeded", (unsigned long)freeMemoryIfNeeded}, +{"authCommand", (unsigned long)authCommand}, +{"pingCommand", (unsigned long)pingCommand}, +{"echoCommand", (unsigned long)echoCommand}, +{"setCommand", (unsigned long)setCommand}, +{"setnxCommand", (unsigned long)setnxCommand}, +{"getCommand", (unsigned long)getCommand}, +{"delCommand", (unsigned long)delCommand}, +{"existsCommand", (unsigned long)existsCommand}, +{"incrCommand", (unsigned long)incrCommand}, +{"decrCommand", (unsigned long)decrCommand}, +{"incrbyCommand", (unsigned long)incrbyCommand}, +{"decrbyCommand", (unsigned long)decrbyCommand}, +{"selectCommand", (unsigned long)selectCommand}, +{"randomkeyCommand", (unsigned long)randomkeyCommand}, +{"keysCommand", (unsigned long)keysCommand}, +{"dbsizeCommand", (unsigned long)dbsizeCommand}, +{"lastsaveCommand", (unsigned long)lastsaveCommand}, +{"saveCommand", (unsigned long)saveCommand}, +{"bgsaveCommand", (unsigned long)bgsaveCommand}, +{"shutdownCommand", (unsigned long)shutdownCommand}, +{"moveCommand", (unsigned long)moveCommand}, +{"renameCommand", (unsigned long)renameCommand}, +{"renamenxCommand", (unsigned long)renamenxCommand}, +{"lpushCommand", (unsigned long)lpushCommand}, +{"rpushCommand", (unsigned long)rpushCommand}, +{"lpopCommand", (unsigned long)lpopCommand}, +{"rpopCommand", (unsigned long)rpopCommand}, +{"llenCommand", (unsigned long)llenCommand}, +{"lindexCommand", (unsigned long)lindexCommand}, +{"lrangeCommand", (unsigned long)lrangeCommand}, +{"ltrimCommand", (unsigned long)ltrimCommand}, +{"typeCommand", (unsigned long)typeCommand}, +{"lsetCommand", (unsigned long)lsetCommand}, +{"saddCommand", (unsigned long)saddCommand}, +{"sremCommand", (unsigned long)sremCommand}, +{"smoveCommand", (unsigned long)smoveCommand}, +{"sismemberCommand", (unsigned long)sismemberCommand}, +{"scardCommand", (unsigned long)scardCommand}, +{"spopCommand", (unsigned long)spopCommand}, +{"srandmemberCommand", (unsigned long)srandmemberCommand}, +{"sinterCommand", (unsigned long)sinterCommand}, +{"sinterstoreCommand", (unsigned long)sinterstoreCommand}, +{"sunionCommand", (unsigned long)sunionCommand}, +{"sunionstoreCommand", (unsigned long)sunionstoreCommand}, +{"sdiffCommand", (unsigned long)sdiffCommand}, +{"sdiffstoreCommand", (unsigned long)sdiffstoreCommand}, +{"syncCommand", (unsigned long)syncCommand}, +{"flushdbCommand", (unsigned long)flushdbCommand}, +{"flushallCommand", (unsigned long)flushallCommand}, +{"sortCommand", (unsigned long)sortCommand}, +{"lremCommand", (unsigned long)lremCommand}, +{"infoCommand", (unsigned long)infoCommand}, +{"mgetCommand", (unsigned long)mgetCommand}, +{"monitorCommand", (unsigned long)monitorCommand}, +{"expireCommand", (unsigned long)expireCommand}, +{"expireatCommand", (unsigned long)expireatCommand}, +{"getsetCommand", (unsigned long)getsetCommand}, +{"ttlCommand", (unsigned long)ttlCommand}, +{"slaveofCommand", (unsigned long)slaveofCommand}, +{"debugCommand", (unsigned long)debugCommand}, +{"processCommand", (unsigned long)processCommand}, +{"setupSigSegvAction", (unsigned long)setupSigSegvAction}, +{"readQueryFromClient", (unsigned long)readQueryFromClient}, +{"rdbRemoveTempFile", (unsigned long)rdbRemoveTempFile}, +{"msetGenericCommand", (unsigned long)msetGenericCommand}, +{"msetCommand", (unsigned long)msetCommand}, +{"msetnxCommand", (unsigned long)msetnxCommand}, +{"zslCreateNode", (unsigned long)zslCreateNode}, +{"zslCreate", (unsigned long)zslCreate}, +{"zslFreeNode",(unsigned long)zslFreeNode}, +{"zslFree",(unsigned long)zslFree}, +{"zslRandomLevel",(unsigned long)zslRandomLevel}, +{"zslInsert",(unsigned long)zslInsert}, +{"zslDelete",(unsigned long)zslDelete}, +{"createZsetObject",(unsigned long)createZsetObject}, +{"zaddCommand",(unsigned long)zaddCommand}, +{"zrangeGenericCommand",(unsigned long)zrangeGenericCommand}, +{"zrangeCommand",(unsigned long)zrangeCommand}, +{"zrevrangeCommand",(unsigned long)zrevrangeCommand}, +{"zremCommand",(unsigned long)zremCommand}, +{"rdbSaveDoubleValue",(unsigned long)rdbSaveDoubleValue}, +{"rdbLoadDoubleValue",(unsigned long)rdbLoadDoubleValue}, +{NULL,0} +}; + +/* This function try to convert a pointer into a function name. It's used in + * oreder to provide a backtrace under segmentation fault that's able to + * display functions declared as static (otherwise the backtrace is useless). */ +static char *findFuncName(void *pointer, unsigned long *offset){ + int i, ret = -1; + unsigned long off, minoff = 0; + + /* Try to match against the Symbol with the smallest offset */ + for (i=0; symsTable[i].pointer; i++) { + unsigned long lp = (unsigned long) pointer; + + if (lp != (unsigned long)-1 && lp >= symsTable[i].pointer) { + off=lp-symsTable[i].pointer; + if (ret < 0 || off < minoff) { + minoff=off; + ret=i; + } + } + } + if (ret == -1) return NULL; + *offset = minoff; + return symsTable[ret].name; +} + +static void *getMcontextEip(ucontext_t *uc) { +#if defined(__FreeBSD__) + return (void*) uc->uc_mcontext.mc_eip; +#elif defined(__dietlibc__) + return (void*) uc->uc_mcontext.eip; +#elif defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6) + return (void*) uc->uc_mcontext->__ss.__eip; +#elif defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6) + #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__) + return (void*) uc->uc_mcontext->__ss.__rip; + #else + return (void*) uc->uc_mcontext->__ss.__eip; + #endif +#elif defined(__i386__) || defined(__X86_64__) /* Linux x86 */ + return (void*) uc->uc_mcontext.gregs[REG_EIP]; +#elif defined(__ia64__) /* Linux IA64 */ + return (void*) uc->uc_mcontext.sc_ip; +#else + return NULL; +#endif +} + +static void segvHandler(int sig, siginfo_t *info, void *secret) { + void *trace[100]; + char **messages = NULL; + int i, trace_size = 0; + unsigned long offset=0; + time_t uptime = time(NULL)-server.stat_starttime; + ucontext_t *uc = (ucontext_t*) secret; + REDIS_NOTUSED(info); + + redisLog(REDIS_WARNING, + "======= Ooops! Redis %s got signal: -%d- =======", REDIS_VERSION, sig); + redisLog(REDIS_WARNING, "%s", sdscatprintf(sdsempty(), + "redis_version:%s; " + "uptime_in_seconds:%d; " + "connected_clients:%d; " + "connected_slaves:%d; " + "used_memory:%zu; " + "changes_since_last_save:%lld; " + "bgsave_in_progress:%d; " + "last_save_time:%d; " + "total_connections_received:%lld; " + "total_commands_processed:%lld; " + "role:%s;" + ,REDIS_VERSION, + uptime, + listLength(server.clients)-listLength(server.slaves), + listLength(server.slaves), + server.usedmemory, + server.dirty, + server.bgsaveinprogress, + server.lastsave, + server.stat_numconnections, + server.stat_numcommands, + server.masterhost == NULL ? "master" : "slave" + )); + + trace_size = backtrace(trace, 100); + /* overwrite sigaction with caller's address */ + if (getMcontextEip(uc) != NULL) { + trace[1] = getMcontextEip(uc); + } + messages = backtrace_symbols(trace, trace_size); + + for (i=1; i /proc/sys/vm/overcommit_memory' in your init scripts."); + redisLog(REDIS_WARNING,"WARNING overcommit_memory is set to 0! Background save may fail under low condition memory. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect."); } } #endif /* __linux__ */ @@ -3967,10 +5596,6 @@ static void daemonize(void) { } int main(int argc, char **argv) { -#ifdef __linux__ - linuxOvercommitMemoryWarning(); -#endif - initServerConfig(); if (argc == 2) { ResetServerSaveParams(); @@ -3978,10 +5603,15 @@ int main(int argc, char **argv) { } else if (argc > 2) { fprintf(stderr,"Usage: ./redis-server [/path/to/redis.conf]\n"); exit(1); + } else { + redisLog(REDIS_WARNING,"Warning: no config file specified, using the default config. In order to specify a config file use 'redis-server /path/to/redis.conf'"); } initServer(); if (server.daemonize) daemonize(); redisLog(REDIS_NOTICE,"Server started, Redis version " REDIS_VERSION); +#ifdef __linux__ + linuxOvercommitMemoryWarning(); +#endif if (rdbLoad(server.dbfilename) == REDIS_OK) redisLog(REDIS_NOTICE,"DB loaded from disk"); if (aeCreateFileEvent(server.el, server.fd, AE_READABLE,