X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/40c32c3e4980d581c8468a9befa67e427c5249f3..123d7c93cb73a0d09f2a8b34322f1a0f4acc71ba:/redis.c?ds=sidebyside diff --git a/redis.c b/redis.c index 118e5bc9..607c827a 100644 --- a/redis.c +++ b/redis.c @@ -27,16 +27,24 @@ * POSSIBILITY OF SUCH DAMAGE. */ -#define REDIS_VERSION "0.09" +#define REDIS_VERSION "0.900" #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 @@ -50,13 +58,15 @@ #include #include +#include "redis.h" #include "ae.h" /* Event driven programming library */ #include "sds.h" /* Dynamic safe strings */ #include "anet.h" /* Networking the easy way */ #include "dict.h" /* Hash tables */ #include "adlist.h" /* Linked lists */ #include "zmalloc.h" /* total memory usage aware version of malloc/free */ -#include "lzf.h" +#include "lzf.h" /* LZF compression library */ +#include "pqsort.h" /* Partial qsort for SORT+LIMIT */ /* Error codes */ #define REDIS_OK 0 @@ -65,22 +75,28 @@ /* Static server configuration */ #define REDIS_SERVERPORT 6379 /* TCP port */ #define REDIS_MAXIDLETIME (60*5) /* default client timeout */ -#define REDIS_QUERYBUF_LEN 1024 +#define REDIS_IOBUF_LEN 1024 #define REDIS_LOADBUF_LEN 1024 -#define REDIS_MAX_ARGS 16 +#define REDIS_STATIC_ARGS 4 #define REDIS_DEFAULT_DBNUM 16 #define REDIS_CONFIGLINE_MAX 1024 #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 @@ -89,6 +105,7 @@ #define REDIS_HASH 3 /* Object types only used for dumping to disk */ +#define REDIS_EXPIRETIME 253 #define REDIS_SELECTDB 254 #define REDIS_EOF 255 @@ -125,11 +142,20 @@ #define REDIS_MASTER 4 /* This client is a master server */ #define REDIS_MONITOR 8 /* This client is a slave monitor, see MONITOR */ -/* Server replication state */ +/* Slave replication state - slave side */ #define REDIS_REPL_NONE 0 /* No active replication */ #define REDIS_REPL_CONNECT 1 /* Must connect to master */ #define REDIS_REPL_CONNECTED 2 /* Connected to master */ +/* Slave replication state - from the point of view of master + * Note that in SEND_BULK and ONLINE state the slave receives new updates + * in its output queue. In the WAIT_BGSAVE state instead the server is waiting + * to start the next background saving in order to send updates to it. */ +#define REDIS_REPL_WAIT_BGSAVE_START 3 /* master waits bgsave to start feeding it */ +#define REDIS_REPL_WAIT_BGSAVE_END 4 /* master waits bgsave to start bulk DB transmission */ +#define REDIS_REPL_SEND_BULK 5 /* master is sending the bulk DB */ +#define REDIS_REPL_ONLINE 6 /* bulk DB already transmitted, receive updates */ + /* List related stuff */ #define REDIS_HEAD 0 #define REDIS_TAIL 1 @@ -151,12 +177,13 @@ /* Anti-warning macro... */ #define REDIS_NOTUSED(V) ((void) V) + /*================================= Data types ============================== */ /* A redis object, that is a type able to hold a string / list / set */ typedef struct redisObject { - int type; void *ptr; + int type; int refcount; } robj; @@ -173,15 +200,19 @@ typedef struct redisClient { redisDb *db; int dictid; sds querybuf; - robj *argv[REDIS_MAX_ARGS]; + robj **argv; int argc; - int bulklen; /* bulk read len. -1 if not in bulk read mode */ + int bulklen; /* bulk read len. -1 if not in bulk read mode */ list *reply; int sentlen; time_t lastinteraction; /* time of the last interaction, used for timeout */ - int flags; /* REDIS_CLOSE | REDIS_SLAVE | REDIS_MONITOR */ - int slaveseldb; /* slave selected db, if this client is a slave */ - int authenticated; /* when requirepass is non-NULL */ + int flags; /* REDIS_CLOSE | REDIS_SLAVE | REDIS_MONITOR */ + int slaveseldb; /* slave selected db, if this client is a slave */ + int authenticated; /* when requirepass is non-NULL */ + int replstate; /* replication state if this is a slave */ + int repldbfd; /* replication DB file descriptor */ + long repldboff; /* replication DB file offset */ + off_t repldbsize; /* replication DB file size */ } redisClient; struct saveparam { @@ -204,7 +235,7 @@ struct redisServer { int cronloops; /* number of times the cron function run */ list *objfreelist; /* A list of freed objects to avoid malloc() */ time_t lastsave; /* Unix time of last save succeeede */ - int usedmemory; /* Used memory in megabytes */ + size_t usedmemory; /* Used memory in megabytes */ /* Fields used only for stats */ time_t stat_starttime; /* server start time */ long long stat_numcommands; /* number of processed commands */ @@ -217,6 +248,7 @@ struct redisServer { int daemonize; char *pidfile; int bgsaveinprogress; + pid_t bgsavechildpid; struct saveparam *saveparams; int saveparamslen; char *logfile; @@ -228,8 +260,10 @@ struct redisServer { int isslave; char *masterhost; int masterport; - redisClient *master; + redisClient *master; /* client that is master for this slave */ int replstate; + unsigned int maxclients; + unsigned int 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; @@ -245,6 +279,11 @@ struct redisCommand { int flags; }; +struct redisFunctionSym { + char *name; + unsigned long pointer; +}; + typedef struct _redisSortObject { robj *obj; union { @@ -288,6 +327,13 @@ 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 updateSlavesWaitingBgsave(int bgsaveerr); +static void freeMemoryIfNeeded(void); +static int processCommand(redisClient *c); +static void setupSigSegvAction(void); +static void rdbRemoveTempFile(pid_t childpid); static void authCommand(redisClient *c); static void pingCommand(redisClient *c); @@ -324,10 +370,16 @@ static void typeCommand(redisClient *c); static void lsetCommand(redisClient *c); static void saddCommand(redisClient *c); 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 sinterCommand(redisClient *c); static void sinterstoreCommand(redisClient *c); +static void sunionCommand(redisClient *c); +static void sunionstoreCommand(redisClient *c); +static void sdiffCommand(redisClient *c); +static void sdiffstoreCommand(redisClient *c); static void syncCommand(redisClient *c); static void flushdbCommand(redisClient *c); static void flushallCommand(redisClient *c); @@ -337,44 +389,55 @@ 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 ttlCommand(redisClient *c); +static void slaveofCommand(redisClient *c); +static void debugCommand(redisClient *c); /*================================= Globals ================================= */ /* Global vars */ 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}, - {"del",delCommand,2,REDIS_CMD_INLINE}, + {"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}, + {"spop",spopCommand,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}, + {"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}, {"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}, {"keys",keysCommand,2,REDIS_CMD_INLINE}, {"dbsize",dbsizeCommand,1,REDIS_CMD_INLINE}, {"auth",authCommand,2,REDIS_CMD_INLINE}, @@ -388,13 +451,14 @@ 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. */ @@ -520,8 +584,7 @@ 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; @@ -531,7 +594,12 @@ void redisLog(int level, const char *fmt, ...) va_start(ap, fmt); if (level >= server.verbosity) { char *c = ".-*"; - fprintf(fp,"%c ",c[level]); + char buf[64]; + time_t now; + + now = time(NULL); + strftime(buf,64,"%d %b %H:%M:%S",gmtime(&now)); + fprintf(fp,"%s %c ",buf,c[level]); vfprintf(fp, fmt, ap); fprintf(fp,"\n"); fflush(fp); @@ -611,26 +679,49 @@ static void oom(const char *msg) { } /* ====================== Redis server networking stuff ===================== */ -void closeTimedoutClients(void) { +static void closeTimedoutClients(void) { redisClient *c; - listIter *li; listNode *ln; time_t now = time(NULL); - li = listGetIterator(server.clients,AL_START_HEAD); - if (!li) return; - while ((ln = listNextElement(li)) != NULL) { + listRewind(server.clients); + while ((ln = listYield(server.clients)) != NULL) { c = listNodeValue(ln); if (!(c->flags & REDIS_SLAVE) && /* no timeout for slaves */ + !(c->flags & REDIS_MASTER) && /* no timeout for masters */ (now - c->lastinteraction > server.maxidletime)) { redisLog(REDIS_DEBUG,"Closing idle client"); freeClient(c); } } - listReleaseIterator(li); } -int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) { +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 */ +static void tryResizeHashTables(void) { + int j; + + for (j = 0; j < server.dbnum; 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_DEBUG,"Hash table %d resized.",j); + } + if (htNeedsResize(server.db[j].expires)) + dictResize(server.db[j].expires); + } +} + +static int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) { int j, loops = server.cronloops++; REDIS_NOTUSED(eventLoop); REDIS_NOTUSED(id); @@ -639,29 +730,30 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) { /* Update the global state with the amount of used memory */ server.usedmemory = zmalloc_used_memory(); - /* If the percentage of used slots in the HT reaches REDIS_HT_MINFILL - * we resize the hash table to save memory */ + /* Show some info about non-empty databases */ for (j = 0; j < server.dbnum; j++) { - int size, used, vkeys; + long long size, used, vkeys; 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); */ } - 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); - dictResize(server.db[j].dict); - redisLog(REDIS_NOTICE,"Hash table %d resized.",j); - } } + /* We don't want to resize the hash tables while a bacground saving + * is in progress: the saving child is created using fork() that is + * implemented with a copy-on-write semantic in most modern systems, so + * if we resize the HT while there is the saving child at work actually + * a lot of memory movements in the parent will cause a lot of pages + * copied. */ + if (!server.bgsaveinprogress) tryResizeHashTables(); + /* Show information about connected clients */ if (!(loops % 5)) { - redisLog(REDIS_DEBUG,"%d clients connected (%d slaves), %d 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, @@ -669,7 +761,7 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) { } /* Close connections of timedout clients */ - if (!(loops % 10)) + if (server.maxidletime && !(loops % 10)) closeTimedoutClients(); /* Check if a background saving in progress terminated */ @@ -677,16 +769,23 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) { int statloc; 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; + server.bgsavechildpid = -1; + updateSlavesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR); } } else { /* If there is not a background saving in progress check if @@ -803,6 +902,9 @@ static void initServerConfig() { server.dbfilename = "dump.rdb"; 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 */ @@ -821,6 +923,7 @@ static void initServer() { signal(SIGHUP, SIG_IGN); signal(SIGPIPE, SIG_IGN); + setupSigSegvAction(); server.clients = listCreate(); server.slaves = listCreate(); @@ -830,7 +933,6 @@ 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); @@ -845,6 +947,7 @@ static void initServer() { } server.cronloops = 0; server.bgsaveinprogress = 0; + server.bgsavechildpid = -1; server.lastsave = time(NULL); server.dirty = 0; server.usedmemory = 0; @@ -855,27 +958,41 @@ static void initServer() { } /* Empty the whole database */ -static void emptyDb() { +static long long emptyDb() { int j; + long long removed = 0; for (j = 0; j < server.dbnum; j++) { + removed += dictSize(server.db[j].dict); dictEmpty(server.db[j].dict); dictEmpty(server.db[j].expires); } + return removed; +} + +static int yesnotoi(char *s) { + if (!strcasecmp(s,"yes")) return 1; + else if (!strcasecmp(s,"no")) return 0; + else return -1; } /* 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; @@ -895,92 +1012,94 @@ static void loadServerConfig(char *filename) { sdstolower(argv[0]); /* Execute config directives */ - if (!strcmp(argv[0],"timeout") && argc == 2) { + if (!strcasecmp(argv[0],"timeout") && argc == 2) { server.maxidletime = atoi(argv[1]); - if (server.maxidletime < 1) { + if (server.maxidletime < 0) { err = "Invalid timeout value"; goto loaderr; } - } else if (!strcmp(argv[0],"port") && argc == 2) { + } else if (!strcasecmp(argv[0],"port") && argc == 2) { server.port = atoi(argv[1]); if (server.port < 1 || server.port > 65535) { err = "Invalid port"; goto loaderr; } - } else if (!strcmp(argv[0],"bind") && argc == 2) { + } else if (!strcasecmp(argv[0],"bind") && argc == 2) { server.bindaddr = zstrdup(argv[1]); - } else if (!strcmp(argv[0],"save") && argc == 3) { + } else if (!strcasecmp(argv[0],"save") && argc == 3) { int seconds = atoi(argv[1]); int changes = atoi(argv[2]); if (seconds < 1 || changes < 0) { err = "Invalid save parameters"; goto loaderr; } appendServerSaveParams(seconds,changes); - } else if (!strcmp(argv[0],"dir") && argc == 2) { + } else if (!strcasecmp(argv[0],"dir") && argc == 2) { if (chdir(argv[1]) == -1) { redisLog(REDIS_WARNING,"Can't chdir to '%s': %s", argv[1], strerror(errno)); exit(1); } - } else if (!strcmp(argv[0],"loglevel") && argc == 2) { - if (!strcmp(argv[1],"debug")) server.verbosity = REDIS_DEBUG; - else if (!strcmp(argv[1],"notice")) server.verbosity = REDIS_NOTICE; - else if (!strcmp(argv[1],"warning")) server.verbosity = REDIS_WARNING; + } else if (!strcasecmp(argv[0],"loglevel") && argc == 2) { + if (!strcasecmp(argv[1],"debug")) server.verbosity = REDIS_DEBUG; + else if (!strcasecmp(argv[1],"notice")) server.verbosity = REDIS_NOTICE; + else if (!strcasecmp(argv[1],"warning")) server.verbosity = REDIS_WARNING; else { err = "Invalid log level. Must be one of debug, notice, warning"; goto loaderr; } - } else if (!strcmp(argv[0],"logfile") && argc == 2) { - FILE *fp; + } else if (!strcasecmp(argv[0],"logfile") && argc == 2) { + FILE *logfp; server.logfile = zstrdup(argv[1]); - if (!strcmp(server.logfile,"stdout")) { + if (!strcasecmp(server.logfile,"stdout")) { zfree(server.logfile); server.logfile = NULL; } 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 (!strcmp(argv[0],"databases") && argc == 2) { + } 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 (!strcmp(argv[0],"slaveof") && argc == 3) { + } else if (!strcasecmp(argv[0],"maxclients") && argc == 2) { + server.maxclients = atoi(argv[1]); + } else if (!strcasecmp(argv[0],"maxmemory") && argc == 2) { + server.maxmemory = atoi(argv[1]); + } else if (!strcasecmp(argv[0],"slaveof") && argc == 3) { server.masterhost = sdsnew(argv[1]); server.masterport = atoi(argv[2]); server.replstate = REDIS_REPL_CONNECT; - } else if (!strcmp(argv[0],"glueoutputbuf") && argc == 2) { - sdstolower(argv[1]); - if (!strcmp(argv[1],"yes")) server.glueoutputbuf = 1; - else if (!strcmp(argv[1],"no")) server.glueoutputbuf = 0; - else { + } else if (!strcasecmp(argv[0],"glueoutputbuf") && argc == 2) { + if ((server.glueoutputbuf = yesnotoi(argv[1])) == -1) { err = "argument must be 'yes' or 'no'"; goto loaderr; } - } else if (!strcmp(argv[0],"shareobjects") && argc == 2) { - sdstolower(argv[1]); - if (!strcmp(argv[1],"yes")) server.shareobjects = 1; - else if (!strcmp(argv[1],"no")) server.shareobjects = 0; - else { + } else if (!strcasecmp(argv[0],"shareobjects") && argc == 2) { + if ((server.shareobjects = yesnotoi(argv[1])) == -1) { err = "argument must be 'yes' or 'no'"; goto loaderr; } - } else if (!strcmp(argv[0],"daemonize") && argc == 2) { - sdstolower(argv[1]); - if (!strcmp(argv[1],"yes")) server.daemonize = 1; - else if (!strcmp(argv[1],"no")) server.daemonize = 0; - else { + } 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 (!strcmp(argv[0],"requirepass") && argc == 2) { + } else if (!strcasecmp(argv[0],"requirepass") && argc == 2) { server.requirepass = zstrdup(argv[1]); - } else if (!strcmp(argv[0],"pidfile") && argc == 2) { + } else if (!strcasecmp(argv[0],"pidfile") && argc == 2) { server.pidfile = zstrdup(argv[1]); + } else if (!strcasecmp(argv[0],"dbfilename") && argc == 2) { + server.dbfilename = zstrdup(argv[1]); } else { err = "Bad directive or wrong number of arguments"; goto loaderr; } @@ -989,7 +1108,7 @@ static void loadServerConfig(char *filename) { zfree(argv); sdsfree(line); } - fclose(fp); + if (fp != stdin) fclose(fp); return; loaderr: @@ -1021,6 +1140,8 @@ static void freeClient(redisClient *c) { assert(ln != NULL); listDelNode(server.clients,ln); if (c->flags & REDIS_SLAVE) { + if (c->replstate == REDIS_REPL_SEND_BULK && c->repldbfd != -1) + close(c->repldbfd); list *l = (c->flags & REDIS_MONITOR) ? server.monitors : server.slaves; ln = listSearchKey(l,c); assert(ln != NULL); @@ -1030,18 +1151,19 @@ static void freeClient(redisClient *c) { server.master = NULL; server.replstate = REDIS_REPL_CONNECT; } + zfree(c->argv); zfree(c); } static void glueReplyBuffersIfNeeded(redisClient *c) { int totlen = 0; - listNode *ln = c->reply->head, *next; + listNode *ln; robj *o; - while(ln) { + listRewind(c->reply); + while((ln = listYield(c->reply))) { o = ln->value; totlen += sdslen(o->ptr); - ln = ln->next; /* This optimization makes more sense if we don't have to copy * too much data */ if (totlen > 1024) return; @@ -1050,17 +1172,16 @@ static void glueReplyBuffersIfNeeded(redisClient *c) { char buf[1024]; int copylen = 0; - ln = c->reply->head; - while(ln) { - next = ln->next; + listRewind(c->reply); + while((ln = listYield(c->reply))) { o = ln->value; memcpy(buf+copylen,o->ptr,sdslen(o->ptr)); copylen += sdslen(o->ptr); listDelNode(c->reply,ln); - ln = next; } /* Now the output buffer is empty, add the new single element */ - addReplySds(c,sdsnewlen(buf,totlen)); + o = createObject(REDIS_STRING,sdsnewlen(buf,totlen)); + if (!listAddNodeTail(c->reply,o)) oom("listAddNodeTail"); } } @@ -1083,6 +1204,7 @@ 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); @@ -1095,6 +1217,12 @@ 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) { @@ -1116,7 +1244,7 @@ static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) static struct redisCommand *lookupCommand(char *name) { int j = 0; while(cmdTable[j].name != NULL) { - if (!strcmp(name,cmdTable[j].name)) return &cmdTable[j]; + if (!strcasecmp(name,cmdTable[j].name)) return &cmdTable[j]; j++; } return NULL; @@ -1140,10 +1268,12 @@ static int processCommand(redisClient *c) { struct redisCommand *cmd; long long dirty; - sdstolower(c->argv[0]->ptr); + /* Free some memory if needed (maxmemory setting) */ + if (server.maxmemory) freeMemoryIfNeeded(); + /* The QUIT command is handled as a special case. Normal command * procs are unable to close the client connection safely */ - if (!strcmp(c->argv[0]->ptr,"quit")) { + if (!strcasecmp(c->argv[0]->ptr,"quit")) { freeClient(c); return 0; } @@ -1157,6 +1287,10 @@ 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); @@ -1211,9 +1345,18 @@ static int processCommand(redisClient *c) { } static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc) { - listNode *ln = slaves->head; - robj *outv[REDIS_MAX_ARGS*4]; /* enough room for args, spaces, newlines */ + listNode *ln; int outc = 0, j; + robj **outv; + /* (args*2)+1 is enough room for args, spaces, newlines */ + robj *static_outv[REDIS_STATIC_ARGS*2+1]; + + if (argc <= REDIS_STATIC_ARGS) { + outv = static_outv; + } else { + outv = zmalloc(sizeof(robj*)*(argc*2+1)); + if (!outv) oom("replicationFeedSlaves"); + } for (j = 0; j < argc; j++) { if (j != 0) outv[outc++] = shared.space; @@ -1229,8 +1372,18 @@ static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int di } outv[outc++] = shared.crlf; - while(ln) { + /* Increment all the refcounts at start and decrement at end in order to + * be sure to free objects if there is no slave in a replication state + * able to be feed with commands */ + for (j = 0; j < outc; j++) incrRefCount(outv[j]); + listRewind(slaves); + while((ln = listYield(slaves))) { redisClient *slave = ln->value; + + /* Don't feed slaves that are still waiting for BGSAVE to start */ + if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_START) continue; + + /* Feed all the other slaves, MONITORs and so on */ if (slave->slaveseldb != dictid) { robj *selectcmd; @@ -1255,18 +1408,19 @@ static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int di slave->slaveseldb = dictid; } for (j = 0; j < outc; j++) addReply(slave,outv[j]); - ln = ln->next; } + for (j = 0; j < outc; j++) decrRefCount(outv[j]); + if (outv != static_outv) zfree(outv); } static void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) { redisClient *c = (redisClient*) privdata; - char buf[REDIS_QUERYBUF_LEN]; + char buf[REDIS_IOBUF_LEN]; int nread; REDIS_NOTUSED(el); REDIS_NOTUSED(mask); - nread = read(fd, buf, REDIS_QUERYBUF_LEN); + nread = read(fd, buf, REDIS_IOBUF_LEN); if (nread == -1) { if (errno == EAGAIN) { nread = 0; @@ -1292,6 +1446,7 @@ again: /* Read the first line of the query */ char *p = strchr(c->querybuf,'\n'); size_t querylen; + if (p) { sds query, *argv; int argc, j; @@ -1314,9 +1469,14 @@ again: return; } argv = sdssplitlen(query,sdslen(query)," ",1,&argc); - sdsfree(query); if (argv == NULL) oom("sdssplitlen"); - for (j = 0; j < argc && j < REDIS_MAX_ARGS; j++) { + 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])) { c->argv[c->argc] = createObject(REDIS_STRING,argv[j]); c->argc++; @@ -1328,9 +1488,9 @@ 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; @@ -1360,6 +1520,11 @@ static int selectDb(redisClient *c, int id) { return REDIS_OK; } +static void *dupClientReplyValue(void *o) { + incrRefCount((robj*)o); + return 0; +} + static redisClient *createClient(int fd) { redisClient *c = zmalloc(sizeof(*c)); @@ -1370,13 +1535,16 @@ static redisClient *createClient(int fd) { c->fd = fd; c->querybuf = sdsempty(); c->argc = 0; + c->argv = NULL; c->bulklen = -1; 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"); listSetFreeMethod(c->reply,decrRefCount); + listSetDupMethod(c->reply,dupClientReplyValue); if (aeCreateFileEvent(server.el, c->fd, AE_READABLE, readQueryFromClient, c, NULL) == AE_ERR) { freeClient(c); @@ -1388,6 +1556,8 @@ static redisClient *createClient(int fd) { static void addReply(redisClient *c, robj *obj) { if (listLength(c->reply) == 0 && + (c->replstate == REDIS_REPL_NONE || + 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"); @@ -1403,6 +1573,7 @@ static void addReplySds(redisClient *c, sds s) { 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); @@ -1413,11 +1584,23 @@ 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++; } @@ -1585,6 +1768,12 @@ static int rdbSaveType(FILE *fp, unsigned char type) { return 0; } +static int rdbSaveTime(FILE *fp, time_t t) { + int32_t t32 = (int32_t) t; + if (fwrite(&t32,4,1,fp) == 0) return -1; + return 0; +} + /* check rdbLoadLen() comments for more info */ static int rdbSaveLen(FILE *fp, uint32_t len) { unsigned char buf[2]; @@ -1611,7 +1800,7 @@ 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]; @@ -1654,10 +1843,10 @@ static int rdbSaveLzfStringObject(FILE *fp, robj *obj) { /* We require at least four bytes compression for this to be worth it */ outlen = sdslen(obj->ptr)-4; if (outlen <= 0) return 0; - if ((out = zmalloc(outlen)) == NULL) return 0; + if ((out = zmalloc(outlen+1)) == NULL) return 0; comprlen = lzf_compress(obj->ptr, sdslen(obj->ptr), out, outlen); if (comprlen == 0) { - free(out); + zfree(out); return 0; } /* Data compressed! Let's save it on disk */ @@ -1666,11 +1855,11 @@ static int rdbSaveLzfStringObject(FILE *fp, robj *obj) { if (rdbSaveLen(fp,comprlen) == -1) goto writeerr; if (rdbSaveLen(fp,sdslen(obj->ptr)) == -1) goto writeerr; if (fwrite(out,comprlen,1,fp) == 0) goto writeerr; - free(out); + zfree(out); return comprlen; writeerr: - free(out); + zfree(out); return -1; } @@ -1690,8 +1879,8 @@ static int rdbSaveStringObject(FILE *fp, robj *obj) { } /* Try LZF compression - under 20 bytes it's unable to compress even - * aaaaaaaaaaaaaaaaaa so to try is just useful to make the CPU hot */ - if (0 && len > 20) { + * aaaaaaaaaaaaaaaaaa so skip it */ + if (1 && len > 20) { int retval; retval = rdbSaveLzfStringObject(fp,obj); @@ -1713,8 +1902,9 @@ static int rdbSave(char *filename) { FILE *fp; char tmpfile[256]; 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)); @@ -1722,7 +1912,8 @@ static int rdbSave(char *filename) { } if (fwrite("REDIS0001",9,1,fp) == 0) goto werr; for (j = 0; j < server.dbnum; j++) { - dict *d = server.db[j].dict; + redisDb *db = server.db+j; + dict *d = db->dict; if (dictSize(d) == 0) continue; di = dictGetIterator(d); if (!di) { @@ -1738,7 +1929,16 @@ static int rdbSave(char *filename) { while((de = dictNext(di)) != NULL) { robj *key = dictGetEntryKey(de); robj *o = dictGetEntryVal(de); - + time_t expiretime = getExpire(db,key); + + /* Save the expire time */ + if (expiretime != -1) { + /* If this key is already expired skip it */ + if (expiretime < now) continue; + if (rdbSaveType(fp,REDIS_EXPIRETIME) == -1) goto werr; + if (rdbSaveTime(fp,expiretime) == -1) goto werr; + } + /* Save the key and associated value */ if (rdbSaveType(fp,o->type) == -1) goto werr; if (rdbSaveStringObject(fp,key) == -1) goto werr; if (o->type == REDIS_STRING) { @@ -1747,14 +1947,14 @@ static int rdbSave(char *filename) { } else if (o->type == REDIS_LIST) { /* Save a list value */ list *list = o->ptr; - listNode *ln = list->head; + listNode *ln; + listRewind(list); if (rdbSaveLen(fp,listLength(list)) == -1) goto werr; - while(ln) { + while((ln = listYield(list))) { robj *eleobj = listNodeValue(ln); if (rdbSaveStringObject(fp,eleobj) == -1) goto werr; - ln = ln->next; } } else if (o->type == REDIS_SET) { /* Save a set value */ @@ -1818,19 +2018,38 @@ static int rdbSaveBackground(char *filename) { } } else { /* Parent */ + if (childpid == -1) { + redisLog(REDIS_WARNING,"Can't save in background: fork: %s", + strerror(errno)); + return REDIS_ERR; + } 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; return type; } +static time_t rdbLoadTime(FILE *fp) { + int32_t t32; + if (fread(&t32,4,1,fp) == 0) return -1; + return (time_t) t32; +} + /* Load an encoded length from the DB, see the REDIS_RDB_* defines on the top * of this file for a description of how this are stored on disk. * @@ -1892,6 +2111,25 @@ static robj *rdbLoadIntegerObject(FILE *fp, int enctype) { return createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",val)); } +static robj *rdbLoadLzfStringObject(FILE*fp, int rdbver) { + unsigned int len, clen; + unsigned char *c = NULL; + sds val = NULL; + + if ((clen = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR) return NULL; + if ((len = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR) return NULL; + if ((c = zmalloc(clen)) == NULL) goto err; + if ((val = sdsnewlen(NULL,len)) == NULL) goto err; + if (fread(c,clen,1,fp) == 0) goto err; + if (lzf_decompress(c,clen,val,len) == 0) goto err; + zfree(c); + return createObject(REDIS_STRING,val); +err: + zfree(c); + sdsfree(val); + return NULL; +} + static robj *rdbLoadStringObject(FILE*fp, int rdbver) { int isencoded; uint32_t len; @@ -1904,6 +2142,8 @@ static robj *rdbLoadStringObject(FILE*fp, int rdbver) { case REDIS_RDB_ENC_INT16: case REDIS_RDB_ENC_INT32: return tryObjectSharing(rdbLoadIntegerObject(fp,len)); + case REDIS_RDB_ENC_LZF: + return tryObjectSharing(rdbLoadLzfStringObject(fp,rdbver)); default: assert(0!=0); } @@ -1922,11 +2162,12 @@ static int rdbLoad(char *filename) { FILE *fp; robj *keyobj = NULL; uint32_t dbid; - int type; - int retval; + int type, retval, rdbver; dict *d = server.db[0].dict; + redisDb *db = server.db+0; char buf[1024]; - int rdbver; + time_t expiretime = -1, now = time(NULL); + fp = fopen(filename,"r"); if (!fp) return REDIS_ERR; if (fread(buf,9,1,fp) == 0) goto eoferr; @@ -1947,6 +2188,11 @@ static int rdbLoad(char *filename) { /* Read type. */ if ((type = rdbLoadType(fp)) == -1) goto eoferr; + if (type == REDIS_EXPIRETIME) { + if ((expiretime = rdbLoadTime(fp)) == -1) goto eoferr; + /* We read the time so we need to read the object type again */ + if ((type = rdbLoadType(fp)) == -1) goto eoferr; + } if (type == REDIS_EOF) break; /* Handle SELECT DB opcode as a special case */ if (type == REDIS_SELECTDB) { @@ -1956,7 +2202,8 @@ static int rdbLoad(char *filename) { redisLog(REDIS_WARNING,"FATAL: Data file was created with a Redis server configured to handle more than %d databases. Exiting\n", server.dbnum); exit(1); } - d = server.db[dbid].dict; + db = server.db+dbid; + d = db->dict; continue; } /* Read key */ @@ -1994,6 +2241,13 @@ static int rdbLoad(char *filename) { redisLog(REDIS_WARNING,"Loading DB, duplicated key (%s) found! Unrecoverable error, exiting now.", keyobj->ptr); exit(1); } + /* Set the expire time if needed */ + if (expiretime != -1) { + setExpire(db,keyobj,expiretime); + /* Delete this key if already expired */ + if (expiretime < now) deleteKey(db,keyobj); + expiretime = -1; + } keyobj = o = NULL; } fclose(fp); @@ -2076,6 +2330,18 @@ static void getCommand(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]); + } else { + incrRefCount(c->argv[1]); + } + incrRefCount(c->argv[2]); + server.dirty++; + removeExpire(c->db,c->argv[1]); +} + static void mgetCommand(redisClient *c) { int j; @@ -2096,7 +2362,7 @@ static void mgetCommand(redisClient *c) { } } -static void incrDecrCommand(redisClient *c, int incr) { +static void incrDecrCommand(redisClient *c, long long incr) { long long value; int retval; robj *o; @@ -2138,23 +2404,36 @@ static void decrCommand(redisClient *c) { } static void incrbyCommand(redisClient *c) { - int incr = atoi(c->argv[2]->ptr); + long long incr = strtoll(c->argv[2]->ptr, NULL, 10); incrDecrCommand(c,incr); } static void decrbyCommand(redisClient *c) { - int incr = atoi(c->argv[2]->ptr); + long long incr = strtoll(c->argv[2]->ptr, NULL, 10); incrDecrCommand(c,-incr); } /* ========================= Type agnostic commands ========================= */ static void delCommand(redisClient *c) { - if (deleteKey(c->db,c->argv[1])) { - server.dirty++; - addReply(c,shared.cone); - } else { + int deleted = 0, j; + + for (j = 1; j < c->argc; j++) { + if (deleteKey(c->db,c->argv[j])) { + server.dirty++; + deleted++; + } + } + switch(deleted) { + case 0: addReply(c,shared.czero); + break; + case 1: + addReply(c,shared.cone); + break; + default: + addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",deleted)); + break; } } @@ -2177,9 +2456,10 @@ static void randomkeyCommand(redisClient *c) { while(1) { de = dictGetRandomKey(c->db->dict); - if (expireIfNeeded(c->db,dictGetEntryKey(de)) == 0) break; + if (!de || expireIfNeeded(c->db,dictGetEntryKey(de)) == 0) break; } if (de == NULL) { + addReply(c,shared.plus); addReply(c,shared.crlf); } else { addReply(c,shared.plus); @@ -2250,6 +2530,10 @@ static void typeCommand(redisClient *c) { } static void saveCommand(redisClient *c) { + if (server.bgsaveinprogress) { + addReplySds(c,sdsnew("-ERR background save in progress\r\n")); + return; + } if (rdbSave(server.dbfilename) == REDIS_OK) { addReply(c,shared.ok); } else { @@ -2271,13 +2555,26 @@ static void bgsaveCommand(redisClient *c) { static void shutdownCommand(redisClient *c) { redisLog(REDIS_WARNING,"User requested shutdown, saving DB..."); + /* 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) { - unlink(server.pidfile); - } + 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")); } @@ -2613,8 +2910,8 @@ static void ltrimCommand(redisClient *c) { ln = listLast(list); listDelNode(list,ln); } - addReply(c,shared.ok); server.dirty++; + addReply(c,shared.ok); } } } @@ -2624,7 +2921,7 @@ 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); @@ -2695,6 +2992,7 @@ 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); @@ -2702,6 +3000,41 @@ static void sremCommand(redisClient *c) { } } +static void smoveCommand(redisClient *c) { + robj *srcset, *dstset; + + srcset = lookupKeyWrite(c->db,c->argv[1]); + dstset = lookupKeyWrite(c->db,c->argv[2]); + + /* If the source key does not exist return 0, if it's of the wrong type + * raise an error */ + if (srcset == NULL || srcset->type != REDIS_SET) { + addReply(c, srcset ? shared.wrongtypeerr : shared.czero); + return; + } + /* Error if the destination key is not a set as well */ + if (dstset && dstset->type != REDIS_SET) { + addReply(c,shared.wrongtypeerr); + return; + } + /* Remove the element from the source set */ + if (dictDelete(srcset->ptr,c->argv[3]) == DICT_ERR) { + /* Key not found in the src set! return zero */ + addReply(c,shared.czero); + return; + } + server.dirty++; + /* Add the element to the destination set */ + if (!dstset) { + dstset = createSetObject(); + dictAdd(c->db->dict,c->argv[2],dstset); + incrRefCount(c->argv[2]); + } + if (dictAdd(dstset->ptr,c->argv[3],NULL) == DICT_OK) + incrRefCount(c->argv[3]); + addReply(c,shared.cone); +} + static void sismemberCommand(redisClient *c) { robj *set; @@ -2739,6 +3072,34 @@ 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); + + addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",sdslen(ele->ptr))); + addReply(c,ele); + addReply(c,shared.crlf); + dictDelete(set->ptr,ele); + if (htNeedsResize(set->ptr)) dictResize(set->ptr); + server.dirty++; + } + } +} + static int qsortCompareSetsByCardinality(const void *s1, const void *s2) { dict **d1 = (void*) s1, **d2 = (void*) s2; @@ -2752,7 +3113,7 @@ static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, r robj *lenobj = NULL, *dstset = NULL; int j, cardinality = 0; - if (!dv) oom("sinterCommand"); + if (!dv) oom("sinterGenericCommand"); for (j = 0; j < setsnum; j++) { robj *setobj; @@ -2761,7 +3122,12 @@ static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, r lookupKeyRead(c->db,setskeys[j]); if (!setobj) { zfree(dv); - addReply(c,shared.nokeyerr); + if (dstkey) { + deleteKey(c->db,dstkey); + addReply(c,shared.ok); + } else { + addReply(c,shared.nullmultibulk); + } return; } if (setobj->type != REDIS_SET) { @@ -2788,9 +3154,6 @@ static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, r /* If we have a target key where to store the resulting set * create this key with an empty set inside */ dstset = createSetObject(); - deleteKey(c->db,dstkey); - dictAdd(c->db->dict,dstkey,dstset); - incrRefCount(dstkey); } /* Iterate all the elements of the first (smallest) set, and test @@ -2819,10 +3182,20 @@ static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, r } dictReleaseIterator(di); - if (!dstkey) + if (dstkey) { + /* Store the resulting set into the target */ + deleteKey(c->db,dstkey); + dictAdd(c->db->dict,dstkey,dstset); + incrRefCount(dstkey); + } + + if (!dstkey) { lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",cardinality); - else - addReply(c,shared.ok); + } else { + addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n", + dictSize((dict*)dstset->ptr))); + server.dirty++; + } zfree(dv); } @@ -2834,20 +3207,135 @@ static void sinterstoreCommand(redisClient *c) { sinterGenericCommand(c,c->argv+2,c->argc-2,c->argv[1]); } +#define REDIS_OP_UNION 0 +#define REDIS_OP_DIFF 1 + +static void sunionDiffGenericCommand(redisClient *c, robj **setskeys, int setsnum, robj *dstkey, int op) { + dict **dv = zmalloc(sizeof(dict*)*setsnum); + dictIterator *di; + dictEntry *de; + robj *dstset = NULL; + int j, cardinality = 0; + + if (!dv) oom("sunionDiffGenericCommand"); + for (j = 0; j < setsnum; j++) { + robj *setobj; + + setobj = dstkey ? + lookupKeyWrite(c->db,setskeys[j]) : + lookupKeyRead(c->db,setskeys[j]); + if (!setobj) { + dv[j] = NULL; + continue; + } + if (setobj->type != REDIS_SET) { + zfree(dv); + addReply(c,shared.wrongtypeerr); + return; + } + dv[j] = setobj->ptr; + } + + /* We need a temp set object to store our union. If the dstkey + * is not NULL (that is, we are inside an SUNIONSTORE operation) then + * this set object will be the resulting object to set into the target key*/ + dstset = createSetObject(); + + /* Iterate all the elements of all the sets, add every element a single + * time to the result set */ + for (j = 0; j < setsnum; j++) { + if (op == REDIS_OP_DIFF && j == 0 && !dv[j]) break; /* result set is empty */ + 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; + + /* dictAdd will not add the same element multiple times */ + ele = dictGetEntryKey(de); + if (op == REDIS_OP_UNION || j == 0) { + if (dictAdd(dstset->ptr,ele,NULL) == DICT_OK) { + incrRefCount(ele); + cardinality++; + } + } else if (op == REDIS_OP_DIFF) { + if (dictDelete(dstset->ptr,ele) == DICT_OK) { + cardinality--; + } + } + } + dictReleaseIterator(di); + + if (op == REDIS_OP_DIFF && cardinality == 0) break; /* result set is empty */ + } + + /* Output the content of the resulting set, if not in STORE mode */ + 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))); + addReply(c,ele); + addReply(c,shared.crlf); + } + dictReleaseIterator(di); + } else { + /* If we have a target key where to store the resulting set + * create this key with the result set inside */ + deleteKey(c->db,dstkey); + dictAdd(c->db->dict,dstkey,dstset); + incrRefCount(dstkey); + } + + /* Cleanup */ + if (!dstkey) { + decrRefCount(dstset); + } else { + addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n", + dictSize((dict*)dstset->ptr))); + server.dirty++; + } + zfree(dv); +} + +static void sunionCommand(redisClient *c) { + sunionDiffGenericCommand(c,c->argv+1,c->argc-1,NULL,REDIS_OP_UNION); +} + +static void sunionstoreCommand(redisClient *c) { + sunionDiffGenericCommand(c,c->argv+2,c->argc-2,c->argv[1],REDIS_OP_UNION); +} + +static void sdiffCommand(redisClient *c) { + sunionDiffGenericCommand(c,c->argv+1,c->argc-1,NULL,REDIS_OP_DIFF); +} + +static void sdiffstoreCommand(redisClient *c) { + sunionDiffGenericCommand(c,c->argv+2,c->argc-2,c->argv[1],REDIS_OP_DIFF); +} + static void flushdbCommand(redisClient *c) { + server.dirty += dictSize(c->db->dict); dictEmpty(c->db->dict); dictEmpty(c->db->expires); addReply(c,shared.ok); - rdbSave(server.dbfilename); } static void flushallCommand(redisClient *c) { - emptyDb(); + server.dirty += emptyDb(); addReply(c,shared.ok); rdbSave(server.dbfilename); + 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; @@ -2857,7 +3345,7 @@ 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; @@ -3019,13 +3507,14 @@ static void sortCommand(redisClient *c) { j = 0; if (sortval->type == REDIS_LIST) { list *list = sortval->ptr; - listNode *ln = list->head; - while(ln) { + listNode *ln; + + listRewind(list); + while((ln = listYield(list))) { robj *ele = ln->value; vector[j].obj = ele; vector[j].u.score = 0; vector[j].u.cmpobj = NULL; - ln = ln->next; j++; } } else { @@ -3079,7 +3568,10 @@ static void sortCommand(redisClient *c) { server.sort_desc = desc; server.sort_alpha = alpha; server.sort_bypattern = sortby ? 1 : 0; - qsort(vector,vectorlen,sizeof(redisSortObject),sortCompare); + if (sortby && (start != 0 || end != vectorlen-1)) + pqsort(vector,vectorlen,sizeof(redisSortObject),sortCompare, start,end); + else + qsort(vector,vectorlen,sizeof(redisSortObject),sortCompare); } /* Send command output to the output buffer, performing the specified @@ -3087,14 +3579,15 @@ static void sortCommand(redisClient *c) { outputlen = getop ? getop*(end-start+1) : end-start+1; addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",outputlen)); for (j = start; j <= end; j++) { - listNode *ln = operations->head; + listNode *ln; if (!getop) { addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n", sdslen(vector[j].obj->ptr))); addReply(c,vector[j].obj); addReply(c,shared.crlf); } - while(ln) { + listRewind(operations); + while((ln = listYield(operations))) { redisSortOperation *sop = ln->value; robj *val = lookupKeyByPattern(c->db,sop->pattern, vector[j].obj); @@ -3111,7 +3604,6 @@ static void sortCommand(redisClient *c) { } else if (sop->type == REDIS_SORT_DEL) { /* TODO */ } - ln = ln->next; } } @@ -3128,29 +3620,57 @@ 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" + "uptime_in_seconds:%d\r\n" + "uptime_in_days:%d\r\n" "connected_clients:%d\r\n" "connected_slaves:%d\r\n" - "used_memory:%d\r\n" + "used_memory:%zu\r\n" "changes_since_last_save:%lld\r\n" + "bgsave_in_progress:%d\r\n" "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, + uptime, + uptime/(3600*24), listLength(server.clients)-listLength(server.slaves), listLength(server.slaves), server.usedmemory, server.dirty, + server.bgsaveinprogress, 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", + (int)(time(NULL)-server.master->lastinteraction) + ); + } + 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); @@ -3184,6 +3704,18 @@ static int setExpire(redisDb *db, robj *key, time_t when) { } } +/* Return the expire time of the specified key, or -1 if no expire + * is associated with this key (i.e. the key is non volatile) */ +static time_t getExpire(redisDb *db, robj *key) { + dictEntry *de; + + /* No expire? return ASAP */ + if (dictSize(db->expires) == 0 || + (de = dictFind(db->expires,key)) == NULL) return -1; + + return (time_t) dictGetEntryVal(de); +} + static int expireIfNeeded(redisDb *db, robj *key) { time_t when; dictEntry *de; @@ -3209,6 +3741,7 @@ static int deleteIfVolatile(redisDb *db, robj *key) { (de = dictFind(db->expires,key)) == NULL) return 0; /* Delete the key */ + server.dirty++; dictDelete(db->expires,key); return dictDelete(db->dict,key) == DICT_OK; } @@ -3227,33 +3760,30 @@ static void expireCommand(redisClient *c) { return; } else { time_t when = time(NULL)+seconds; - if (setExpire(c->db,c->argv[1],when)) + if (setExpire(c->db,c->argv[1],when)) { addReply(c,shared.cone); - else + server.dirty++; + } else { addReply(c,shared.czero); + } return; } } -/* =============================== Replication ============================= */ +static void ttlCommand(redisClient *c) { + time_t expire; + int ttl = -1; -/* Send the whole output buffer syncronously to the slave. This a general operation in theory, but it is actually useful only for replication. */ -static int flushClientOutput(redisClient *c) { - int retval; - time_t start = time(NULL); - - while(listLength(c->reply)) { - if (time(NULL)-start > 5) return REDIS_ERR; /* 5 seconds timeout */ - retval = aeWait(c->fd,AE_WRITABLE,1000); - if (retval == -1) { - return REDIS_ERR; - } else if (retval & AE_WRITABLE) { - sendReplyToClient(NULL, c->fd, c, AE_WRITABLE); - } + expire = getExpire(c->db,c->argv[1]); + if (expire != -1) { + ttl = (int) (expire-time(NULL)); + if (ttl < 0) ttl = -1; } - return REDIS_OK; + addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",ttl)); } +/* =============================== Replication ============================= */ + static int syncWrite(int fd, char *ptr, ssize_t size, int timeout) { ssize_t nwritten, ret = size; time_t start = time(NULL); @@ -3317,48 +3847,171 @@ static int syncReadLine(int fd, char *ptr, ssize_t size, int timeout) { } static void syncCommand(redisClient *c) { - struct stat sb; - int fd = -1, len; - time_t start = time(NULL); - char sizebuf[32]; - /* ignore SYNC if aleady slave or in monitor mode */ if (c->flags & REDIS_SLAVE) return; - redisLog(REDIS_NOTICE,"Slave ask for syncronization"); - if (flushClientOutput(c) == REDIS_ERR || - rdbSave(server.dbfilename) != REDIS_OK) - goto closeconn; - - fd = open(server.dbfilename, O_RDONLY); - if (fd == -1 || fstat(fd,&sb) == -1) goto closeconn; - len = sb.st_size; - - snprintf(sizebuf,32,"$%d\r\n",len); - if (syncWrite(c->fd,sizebuf,strlen(sizebuf),5) == -1) goto closeconn; - while(len) { - char buf[1024]; - int nread; + /* SYNC can't be issued when the server has pending data to send to + * the client about already issued commands. We need a fresh reply + * buffer registering the differences between the BGSAVE and the current + * dataset, so that we can copy to other slaves if needed. */ + if (listLength(c->reply) != 0) { + addReplySds(c,sdsnew("-ERR SYNC is invalid with pending input\r\n")); + return; + } - if (time(NULL)-start > REDIS_MAX_SYNC_TIME) goto closeconn; - nread = read(fd,buf,1024); - if (nread == -1) goto closeconn; - len -= nread; - if (syncWrite(c->fd,buf,nread,5) == -1) goto closeconn; + redisLog(REDIS_NOTICE,"Slave ask for synchronization"); + /* Here we need to check if there is a background saving operation + * in progress, or if it is required to start one */ + if (server.bgsaveinprogress) { + /* Ok a background save is in progress. Let's check if it is a good + * one for replication, i.e. if there is another slave that is + * registering differences since the server forked to save */ + redisClient *slave; + listNode *ln; + + listRewind(server.slaves); + while((ln = listYield(server.slaves))) { + slave = ln->value; + if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_END) break; + } + if (ln) { + /* Perfect, the server is already registering differences for + * 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 { + /* No way, we need to wait for the next BGSAVE in order to + * register differences */ + c->replstate = REDIS_REPL_WAIT_BGSAVE_START; + redisLog(REDIS_NOTICE,"Waiting for next BGSAVE for SYNC"); + } + } else { + /* Ok we don't have a BGSAVE in progress, let's start one */ + redisLog(REDIS_NOTICE,"Starting BGSAVE for SYNC"); + if (rdbSaveBackground(server.dbfilename) != REDIS_OK) { + redisLog(REDIS_NOTICE,"Replication failed, can't BGSAVE"); + addReplySds(c,sdsnew("-ERR Unalbe to perform background save\r\n")); + return; + } + c->replstate = REDIS_REPL_WAIT_BGSAVE_END; } - if (syncWrite(c->fd,"\r\n",2,5) == -1) goto closeconn; - close(fd); + c->repldbfd = -1; c->flags |= REDIS_SLAVE; c->slaveseldb = 0; if (!listAddNodeTail(server.slaves,c)) oom("listAddNodeTail"); - redisLog(REDIS_NOTICE,"Syncronization with slave succeeded"); return; +} -closeconn: - if (fd != -1) close(fd); - c->flags |= REDIS_CLOSE; - redisLog(REDIS_WARNING,"Syncronization with slave failed"); - return; +static void sendBulkToSlave(aeEventLoop *el, int fd, void *privdata, int mask) { + redisClient *slave = privdata; + REDIS_NOTUSED(el); + REDIS_NOTUSED(mask); + char buf[REDIS_IOBUF_LEN]; + ssize_t nwritten, buflen; + + if (slave->repldboff == 0) { + /* Write the bulk write count before to transfer the DB. In theory here + * we don't know how much room there is in the output buffer of the + * socket, but in pratice SO_SNDLOWAT (the minimum count for output + * operations) will never be smaller than the few bytes we need. */ + sds bulkcount; + + bulkcount = sdscatprintf(sdsempty(),"$%lld\r\n",(unsigned long long) + slave->repldbsize); + if (write(fd,bulkcount,sdslen(bulkcount)) != (signed)sdslen(bulkcount)) + { + sdsfree(bulkcount); + freeClient(slave); + return; + } + sdsfree(bulkcount); + } + lseek(slave->repldbfd,slave->repldboff,SEEK_SET); + buflen = read(slave->repldbfd,buf,REDIS_IOBUF_LEN); + if (buflen <= 0) { + redisLog(REDIS_WARNING,"Read error sending DB to slave: %s", + (buflen == 0) ? "premature EOF" : strerror(errno)); + freeClient(slave); + return; + } + if ((nwritten = write(fd,buf,buflen)) == -1) { + redisLog(REDIS_DEBUG,"Write error sending DB to slave: %s", + strerror(errno)); + freeClient(slave); + return; + } + slave->repldboff += nwritten; + if (slave->repldboff == slave->repldbsize) { + close(slave->repldbfd); + slave->repldbfd = -1; + aeDeleteFileEvent(server.el,slave->fd,AE_WRITABLE); + slave->replstate = REDIS_REPL_ONLINE; + if (aeCreateFileEvent(server.el, slave->fd, AE_WRITABLE, + sendReplyToClient, slave, NULL) == AE_ERR) { + freeClient(slave); + return; + } + addReplySds(slave,sdsempty()); + redisLog(REDIS_NOTICE,"Synchronization with slave succeeded"); + } +} + +/* 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; + + listRewind(server.slaves); + while((ln = listYield(server.slaves))) { + redisClient *slave = ln->value; + + if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_START) { + startbgsave = 1; + slave->replstate = REDIS_REPL_WAIT_BGSAVE_END; + } else if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_END) { + struct redis_stat buf; + + if (bgsaveerr != REDIS_OK) { + freeClient(slave); + redisLog(REDIS_WARNING,"SYNC failed. BGSAVE child returned an error"); + continue; + } + if ((slave->repldbfd = open(server.dbfilename,O_RDONLY)) == -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; + } + slave->repldboff = 0; + slave->repldbsize = buf.st_size; + slave->replstate = REDIS_REPL_SEND_BULK; + aeDeleteFileEvent(server.el,slave->fd,AE_WRITABLE); + if (aeCreateFileEvent(server.el, slave->fd, AE_WRITABLE, sendBulkToSlave, slave, NULL) == AE_ERR) { + freeClient(slave); + continue; + } + } + } + if (startbgsave) { + if (rdbSaveBackground(server.dbfilename) != REDIS_OK) { + listRewind(server.slaves); + redisLog(REDIS_WARNING,"SYNC failed. BGSAVE failed"); + while((ln = listYield(server.slaves))) { + redisClient *slave = ln->value; + + if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_START) + freeClient(slave); + } + } + } } static int syncWithMaster(void) { @@ -3380,7 +4033,7 @@ static int syncWithMaster(void) { return REDIS_ERR; } /* Read the bulk write count */ - if (syncReadLine(fd,buf,1024,5) == -1) { + if (syncReadLine(fd,buf,1024,3600) == -1) { close(fd); redisLog(REDIS_WARNING,"I/O error reading bulk count from MASTER: %s", strerror(errno)); @@ -3435,8 +4088,341 @@ 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\r\n", + key, key->refcount, val, val->refcount)); + } else { + addReplySds(c,sdsnew( + "-ERR Syntax error, try DEBUG [SEGFAULT|OBJECT ]\r\n")); + } +} + +#ifdef HAVE_BACKTRACE +static struct redisFunctionSym symsTable[] = { +{"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}, +{"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}, +{"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}, +{"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}, +{"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}, +{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) + #ifdef _STRUCT_X86_THREAD_STATE64 + 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 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,