* POSSIBILITY OF SUCH DAMAGE.
*/
-#define REDIS_VERSION "0.09"
+#define REDIS_VERSION "0.091"
#include "fmacros.h"
#include "dict.h" /* Hash tables */
#include "adlist.h" /* Linked lists */
#include "zmalloc.h" /* total memory usage aware version of malloc/free */
+#include "lzf.h"
/* Error codes */
#define REDIS_OK 0
/* 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_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 */
/* Hash table parameters */
#define REDIS_HT_MINFILL 10 /* Minimal hash table fill 10% */
#define REDIS_HASH 3
/* Object types only used for dumping to disk */
+#define REDIS_EXPIRETIME 253
#define REDIS_SELECTDB 254
#define REDIS_EOF 255
#define REDIS_RDB_ENC_INT8 0 /* 8 bit signed integer */
#define REDIS_RDB_ENC_INT16 1 /* 16 bit signed integer */
#define REDIS_RDB_ENC_INT32 2 /* 32 bit signed integer */
-#define REDIS_RDB_ENC_FLZ 3 /* string compressed with FASTLZ */
+#define REDIS_RDB_ENC_LZF 3 /* string compressed with FASTLZ */
/* Client flags */
#define REDIS_CLOSE 1 /* This client connection should be closed ASAP */
#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
/* 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;
+typedef struct redisDb {
+ dict *dict;
+ dict *expires;
+ int id;
+} redisDb;
+
/* With multiplexing we need to take per-clinet state.
* Clients are taken in a liked list. */
typedef struct redisClient {
int fd;
- dict *dict;
+ redisDb *db;
int dictid;
sds querybuf;
robj *argv[REDIS_MAX_ARGS];
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 {
struct redisServer {
int port;
int fd;
- dict **dict;
+ redisDb *db;
dict *sharingpool;
unsigned int sharingpoolsize;
long long dirty; /* changes to DB from the last save */
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 */
int isslave;
char *masterhost;
int masterport;
- redisClient *master;
+ redisClient *master; /* client that is master for this slave */
int replstate;
/* Sort parameters - qsort_r() is only available under BSD so we
* have to take this state global, in order to pass it to sortCompare() */
static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc);
static int syncWithMaster(void);
static robj *tryObjectSharing(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 authCommand(redisClient *c);
static void pingCommand(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 sinterCommand(redisClient *c);
static void sinterstoreCommand(redisClient *c);
+static void sunionCommand(redisClient *c);
+static void sunionstoreCommand(redisClient *c);
static void syncCommand(redisClient *c);
static void flushdbCommand(redisClient *c);
static void flushallCommand(redisClient *c);
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);
/*================================= Globals ================================= */
{"lrem",lremCommand,4,REDIS_CMD_BULK},
{"sadd",saddCommand,3,REDIS_CMD_BULK},
{"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},
{"smembers",sinterCommand,2,REDIS_CMD_INLINE},
{"incrby",incrbyCommand,3,REDIS_CMD_INLINE},
{"decrby",decrbyCommand,3,REDIS_CMD_INLINE},
+ {"getset",getSetCommand,3,REDIS_CMD_BULK},
{"randomkey",randomkeyCommand,1,REDIS_CMD_INLINE},
{"select",selectCommand,2,REDIS_CMD_INLINE},
{"move",moveCommand,3,REDIS_CMD_INLINE},
{"sort",sortCommand,-2,REDIS_CMD_INLINE},
{"info",infoCommand,1,REDIS_CMD_INLINE},
{"monitor",monitorCommand,1,REDIS_CMD_INLINE},
+ {"expire",expireCommand,3,REDIS_CMD_INLINE},
{NULL,NULL,0,0}
};
/* ====================== Redis server networking stuff ===================== */
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 */
(now - c->lastinteraction > server.maxidletime)) {
freeClient(c);
}
}
- listReleaseIterator(li);
}
int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
- int j, size, used, loops = server.cronloops++;
+ int j, loops = server.cronloops++;
REDIS_NOTUSED(eventLoop);
REDIS_NOTUSED(id);
REDIS_NOTUSED(clientData);
/* If the percentage of used slots in the HT reaches REDIS_HT_MINFILL
* we resize the hash table to save memory */
for (j = 0; j < server.dbnum; j++) {
- size = dictGetHashTableSize(server.dict[j]);
- used = dictGetHashTableUsed(server.dict[j]);
+ int 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 in %d slots HT.",j,used,size);
+ redisLog(REDIS_DEBUG,"DB %d: %d keys (%d volatile) in %d 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.dict[j]);
+ dictResize(server.db[j].dict);
redisLog(REDIS_NOTICE,"Hash table %d resized.",j);
}
}
/* 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",
listLength(server.clients)-listLength(server.slaves),
listLength(server.slaves),
server.usedmemory,
- dictGetHashTableUsed(server.sharingpool));
+ dictSize(server.sharingpool));
}
/* Close connections of timedout clients */
/* 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) {
"Background saving error");
}
server.bgsaveinprogress = 0;
+ updateSalvesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR);
}
} else {
/* If there is not a background saving in progress check if
}
}
}
+
+ /* Try to expire a few timed out keys */
+ for (j = 0; j < server.dbnum; j++) {
+ redisDb *db = server.db+j;
+ int num = dictSize(db->expires);
+
+ if (num) {
+ time_t now = time(NULL);
+
+ if (num > REDIS_EXPIRELOOKUPS_PER_CRON)
+ num = REDIS_EXPIRELOOKUPS_PER_CRON;
+ while (num--) {
+ dictEntry *de;
+ time_t t;
+
+ if ((de = dictGetRandomKey(db->expires)) == NULL) break;
+ t = (time_t) dictGetEntryVal(de);
+ if (now > t) {
+ deleteKey(db,dictGetEntryKey(de));
+ }
+ }
+ }
+ }
+
/* Check if we should connect to a MASTER */
if (server.replstate == REDIS_REPL_CONNECT) {
redisLog(REDIS_NOTICE,"Connecting to MASTER...");
server.objfreelist = listCreate();
createSharedObjects();
server.el = aeCreateEventLoop();
- server.dict = zmalloc(sizeof(dict*)*server.dbnum);
+ server.db = zmalloc(sizeof(redisDb)*server.dbnum);
server.sharingpool = dictCreate(&setDictType,NULL);
server.sharingpoolsize = 1024;
- if (!server.dict || !server.clients || !server.slaves || !server.monitors || !server.el || !server.objfreelist)
+ 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);
exit(1);
}
- for (j = 0; j < server.dbnum; j++)
- server.dict[j] = dictCreate(&hashDictType,NULL);
+ for (j = 0; j < server.dbnum; j++) {
+ server.db[j].dict = dictCreate(&hashDictType,NULL);
+ server.db[j].expires = dictCreate(&setDictType,NULL);
+ server.db[j].id = j;
+ }
server.cronloops = 0;
server.bgsaveinprogress = 0;
server.lastsave = time(NULL);
}
/* 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;
+}
- for (j = 0; j < server.dbnum; j++)
- dictEmpty(server.dict[j]);
+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...
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) {
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) {
+ } else if (!strcasecmp(argv[0],"logfile") && argc == 2) {
FILE *fp;
server.logfile = zstrdup(argv[1]);
- if (!strcmp(server.logfile,"stdout")) {
+ if (!strcasecmp(server.logfile,"stdout")) {
zfree(server.logfile);
server.logfile = NULL;
}
}
fclose(fp);
}
- } 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],"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],"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;
}
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);
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;
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));
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;
struct redisCommand *cmd;
long long dirty;
- sdstolower(c->argv[0]->ptr);
/* 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;
}
dirty = server.dirty;
cmd->proc(c);
if (server.dirty-dirty != 0 && listLength(server.slaves))
- replicationFeedSlaves(server.slaves,cmd,c->dictid,c->argv,c->argc);
+ replicationFeedSlaves(server.slaves,cmd,c->db->id,c->argv,c->argc);
if (listLength(server.monitors))
- replicationFeedSlaves(server.monitors,cmd,c->dictid,c->argv,c->argc);
+ replicationFeedSlaves(server.monitors,cmd,c->db->id,c->argv,c->argc);
server.stat_numcommands++;
/* Prepare the client for the next command */
}
static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc) {
- listNode *ln = slaves->head;
+ listNode *ln;
robj *outv[REDIS_MAX_ARGS*4]; /* enough room for args, spaces, newlines */
int outc = 0, j;
}
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;
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]);
}
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;
static int selectDb(redisClient *c, int id) {
if (id < 0 || id >= server.dbnum)
return REDIS_ERR;
- c->dict = server.dict[id];
- c->dictid = id;
+ c->db = &server.db[id];
return REDIS_OK;
}
+static void *dupClientReplyValue(void *o) {
+ incrRefCount((robj*)o);
+ return 0;
+}
+
static redisClient *createClient(int fd) {
redisClient *c = zmalloc(sizeof(*c));
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);
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");
return createObject(REDIS_SET,d);
}
-#if 0
-static robj *createHashObject(void) {
- dict *d = dictCreate(&hashDictType,NULL);
- if (!d) oom("dictCreate");
- return createObject(REDIS_SET,d);
-}
-#endif
-
static void freeStringObject(robj *o) {
sdsfree(o->ptr);
}
static void incrRefCount(robj *o) {
o->refcount++;
+#ifdef DEBUG_REFCOUNT
+ if (o->type == REDIS_STRING)
+ printf("Increment '%s'(%p), now is: %d\n",o->ptr,o,o->refcount);
+#endif
}
static void decrRefCount(void *obj) {
robj *o = obj;
+
+#ifdef DEBUG_REFCOUNT
+ if (o->type == REDIS_STRING)
+ printf("Decrement '%s'(%p), now is: %d\n",o->ptr,o,o->refcount-1);
+#endif
if (--(o->refcount) == 0) {
switch(o->type) {
case REDIS_STRING: freeStringObject(o); break;
struct dictEntry *de;
unsigned long c;
- if (server.shareobjects == 0) return o;
+ if (o == NULL || server.shareobjects == 0) return o;
assert(o->type == REDIS_STRING);
de = dictFind(server.sharingpool,o);
* shared we increment its count, everytime there is a miss we
* recrement the counter of a random object. If this object reaches
* zero we remove the object and put the current object instead. */
- if (dictGetHashTableUsed(server.sharingpool) >=
+ if (dictSize(server.sharingpool) >=
server.sharingpoolsize) {
de = dictGetRandomKey(server.sharingpool);
assert(de != NULL);
}
}
+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;
+}
+
/*============================ DB saving/loading ============================ */
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];
return 0;
}
+/* 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) {
+ long long value;
+ char *endptr, buf[32];
+
+ /* Check if it's possible to encode this value as a number */
+ value = strtoll(s, &endptr, 10);
+ if (endptr[0] != '\0') return 0;
+ snprintf(buf,32,"%lld",value);
+
+ /* If the number converted back into a string is not identical
+ * then it's not possible to encode the string as integer */
+ if (strlen(buf) != sdslen(s) || memcmp(buf,s,sdslen(s))) return 0;
+
+ /* Finally check if it fits in our ranges */
+ if (value >= -(1<<7) && value <= (1<<7)-1) {
+ enc[0] = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_INT8;
+ enc[1] = value&0xFF;
+ return 2;
+ } else if (value >= -(1<<15) && value <= (1<<15)-1) {
+ enc[0] = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_INT16;
+ enc[1] = value&0xFF;
+ enc[2] = (value>>8)&0xFF;
+ return 3;
+ } else if (value >= -((long long)1<<31) && value <= ((long long)1<<31)-1) {
+ enc[0] = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_INT32;
+ enc[1] = value&0xFF;
+ enc[2] = (value>>8)&0xFF;
+ enc[3] = (value>>16)&0xFF;
+ enc[4] = (value>>24)&0xFF;
+ return 5;
+ } else {
+ return 0;
+ }
+}
+
+static int rdbSaveLzfStringObject(FILE *fp, robj *obj) {
+ unsigned int comprlen, outlen;
+ unsigned char byte;
+ void *out;
+
+ /* 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;
+ comprlen = lzf_compress(obj->ptr, sdslen(obj->ptr), out, outlen);
+ if (comprlen == 0) {
+ zfree(out);
+ return 0;
+ }
+ /* Data compressed! Let's save it on disk */
+ byte = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_LZF;
+ if (fwrite(&byte,1,1,fp) == 0) goto writeerr;
+ 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;
+ zfree(out);
+ return comprlen;
+
+writeerr:
+ zfree(out);
+ return -1;
+}
+
+/* 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);
+ int enclen;
+
+ /* Try integer encoding */
+ if (len <= 11) {
+ unsigned char buf[5];
+ if ((enclen = rdbTryIntegerEncoding(obj->ptr,buf)) > 0) {
+ if (fwrite(buf,enclen,1,fp) == 0) return -1;
+ return 0;
+ }
+ }
+
+ /* Try LZF compression - under 20 bytes it's unable to compress even
+ * aaaaaaaaaaaaaaaaaa so skip it */
+ if (len > 20) {
+ int retval;
+ retval = rdbSaveLzfStringObject(fp,obj);
+ if (retval == -1) return -1;
+ if (retval > 0) return 0;
+ /* retval == 0 means data can't be compressed, save the old way */
+ }
+
+ /* Store verbatim */
if (rdbSaveLen(fp,len) == -1) return -1;
if (len && fwrite(obj->ptr,len,1,fp) == 0) return -1;
return 0;
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());
fp = fopen(tmpfile,"w");
}
if (fwrite("REDIS0001",9,1,fp) == 0) goto werr;
for (j = 0; j < server.dbnum; j++) {
- dict *d = server.dict[j];
- if (dictGetHashTableUsed(d) == 0) continue;
+ redisDb *db = server.db+j;
+ dict *d = db->dict;
+ if (dictSize(d) == 0) continue;
di = dictGetIterator(d);
if (!di) {
fclose(fp);
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) {
} 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 */
dictEntry *de;
if (!set) oom("dictGetIteraotr");
- if (rdbSaveLen(fp,dictGetHashTableUsed(set)) == -1) goto werr;
+ if (rdbSaveLen(fp,dictSize(set)) == -1) goto werr;
while((de = dictNext(di)) != NULL) {
robj *eleobj = dictGetEntryKey(de);
return type;
}
-static uint32_t rdbLoadLen(FILE *fp, int rdbver) {
+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.
+ *
+ * isencoded is set to 1 if the readed length is not actually a length but
+ * an "encoding type", check the above comments for more info */
+static uint32_t rdbLoadLen(FILE *fp, int rdbver, int *isencoded) {
unsigned char buf[2];
uint32_t len;
+ if (isencoded) *isencoded = 0;
if (rdbver == 0) {
if (fread(&len,4,1,fp) == 0) return REDIS_RDB_LENERR;
return ntohl(len);
type = (buf[0]&0xC0)>>6;
if (type == REDIS_RDB_6BITLEN) {
/* Read a 6 bit len */
- return buf[0];
+ return buf[0]&0x3F;
+ } else if (type == REDIS_RDB_ENCVAL) {
+ /* Read a 6 bit len encoding type */
+ if (isencoded) *isencoded = 1;
+ return buf[0]&0x3F;
} else if (type == REDIS_RDB_14BITLEN) {
/* Read a 14 bit len */
if (fread(buf+1,1,1,fp) == 0) return REDIS_RDB_LENERR;
}
}
-static robj *rdbLoadStringObject(FILE*fp,int rdbver) {
- uint32_t len = rdbLoadLen(fp,rdbver);
+static robj *rdbLoadIntegerObject(FILE *fp, int enctype) {
+ unsigned char enc[4];
+ long long val;
+
+ if (enctype == REDIS_RDB_ENC_INT8) {
+ if (fread(enc,1,1,fp) == 0) return NULL;
+ val = (signed char)enc[0];
+ } else if (enctype == REDIS_RDB_ENC_INT16) {
+ uint16_t v;
+ if (fread(enc,2,1,fp) == 0) return NULL;
+ v = enc[0]|(enc[1]<<8);
+ val = (int16_t)v;
+ } else if (enctype == REDIS_RDB_ENC_INT32) {
+ uint32_t v;
+ if (fread(enc,4,1,fp) == 0) return NULL;
+ v = enc[0]|(enc[1]<<8)|(enc[2]<<16)|(enc[3]<<24);
+ val = (int32_t)v;
+ } else {
+ val = 0; /* anti-warning */
+ assert(0!=0);
+ }
+ 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;
+ return createObject(REDIS_STRING,val);
+err:
+ zfree(c);
+ sdsfree(val);
+ return NULL;
+}
+
+static robj *rdbLoadStringObject(FILE*fp, int rdbver) {
+ int isencoded;
+ uint32_t len;
sds val;
+ len = rdbLoadLen(fp,rdbver,&isencoded);
+ if (isencoded) {
+ switch(len) {
+ case REDIS_RDB_ENC_INT8:
+ 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);
+ }
+ }
+
if (len == REDIS_RDB_LENERR) return NULL;
val = sdsnewlen(NULL,len);
if (len && fread(val,len,1,fp) == 0) {
FILE *fp;
robj *keyobj = NULL;
uint32_t dbid;
- int type;
- int retval;
- dict *d = server.dict[0];
+ 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;
/* 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) {
- if ((dbid = rdbLoadLen(fp,rdbver)) == REDIS_RDB_LENERR) goto eoferr;
+ if ((dbid = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR)
+ goto eoferr;
if (dbid >= (unsigned)server.dbnum) {
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.dict[dbid];
+ db = server.db+dbid;
+ d = db->dict;
continue;
}
/* Read key */
/* Read list/set value */
uint32_t listlen;
- if ((listlen = rdbLoadLen(fp,rdbver)) == REDIS_RDB_LENERR)
+ if ((listlen = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR)
goto eoferr;
o = (type == REDIS_LIST) ? createListObject() : createSetObject();
/* Load every single element of the list/set */
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);
return REDIS_OK;
eoferr: /* unexpected end of file is handled here with a fatal exit */
- decrRefCount(keyobj);
- redisLog(REDIS_WARNING,"Short read loading DB. Unrecoverable error, exiting now.");
+ if (keyobj) decrRefCount(keyobj);
+ redisLog(REDIS_WARNING,"Short read or OOM loading DB. Unrecoverable error, exiting now.");
exit(1);
return REDIS_ERR; /* Just to avoid warning */
}
/*================================== Commands =============================== */
static void authCommand(redisClient *c) {
- if (!strcmp(c->argv[1]->ptr, server.requirepass)) {
+ if (!server.requirepass || !strcmp(c->argv[1]->ptr, server.requirepass)) {
c->authenticated = 1;
addReply(c,shared.ok);
} else {
static void setGenericCommand(redisClient *c, int nx) {
int retval;
- retval = dictAdd(c->dict,c->argv[1],c->argv[2]);
+ retval = dictAdd(c->db->dict,c->argv[1],c->argv[2]);
if (retval == DICT_ERR) {
if (!nx) {
- dictReplace(c->dict,c->argv[1],c->argv[2]);
+ dictReplace(c->db->dict,c->argv[1],c->argv[2]);
incrRefCount(c->argv[2]);
} else {
addReply(c,shared.czero);
incrRefCount(c->argv[2]);
}
server.dirty++;
+ removeExpire(c->db,c->argv[1]);
addReply(c, nx ? shared.cone : shared.ok);
}
}
static void getCommand(redisClient *c) {
- dictEntry *de;
-
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ robj *o = lookupKeyRead(c->db,c->argv[1]);
+
+ if (o == NULL) {
addReply(c,shared.nullbulk);
} else {
- robj *o = dictGetEntryVal(de);
-
if (o->type != REDIS_STRING) {
addReply(c,shared.wrongtypeerr);
} else {
}
}
+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) {
- dictEntry *de;
int j;
addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",c->argc-1));
for (j = 1; j < c->argc; j++) {
- de = dictFind(c->dict,c->argv[j]);
- if (de == NULL) {
+ robj *o = lookupKeyRead(c->db,c->argv[j]);
+ if (o == NULL) {
addReply(c,shared.nullbulk);
} else {
- robj *o = dictGetEntryVal(de);
-
if (o->type != REDIS_STRING) {
addReply(c,shared.nullbulk);
} else {
}
}
-static void incrDecrCommand(redisClient *c, int incr) {
- dictEntry *de;
+static void incrDecrCommand(redisClient *c, long long incr) {
long long value;
int retval;
robj *o;
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ o = lookupKeyWrite(c->db,c->argv[1]);
+ if (o == NULL) {
value = 0;
} else {
- robj *o = dictGetEntryVal(de);
-
if (o->type != REDIS_STRING) {
value = 0;
} else {
value += incr;
o = createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",value));
- retval = dictAdd(c->dict,c->argv[1],o);
+ retval = dictAdd(c->db->dict,c->argv[1],o);
if (retval == DICT_ERR) {
- dictReplace(c->dict,c->argv[1],o);
+ dictReplace(c->db->dict,c->argv[1],o);
+ removeExpire(c->db,c->argv[1]);
} else {
incrRefCount(c->argv[1]);
}
}
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 (dictDelete(c->dict,c->argv[1]) == DICT_OK) {
+ if (deleteKey(c->db,c->argv[1])) {
server.dirty++;
addReply(c,shared.cone);
} else {
}
static void existsCommand(redisClient *c) {
- dictEntry *de;
-
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL)
- addReply(c,shared.czero);
- else
- addReply(c,shared.cone);
+ addReply(c,lookupKeyRead(c->db,c->argv[1]) ? shared.cone : shared.czero);
}
static void selectCommand(redisClient *c) {
int id = atoi(c->argv[1]->ptr);
if (selectDb(c,id) == REDIS_ERR) {
- addReplySds(c,"-ERR invalid DB index\r\n");
+ addReplySds(c,sdsnew("-ERR invalid DB index\r\n"));
} else {
addReply(c,shared.ok);
}
static void randomkeyCommand(redisClient *c) {
dictEntry *de;
-
- de = dictGetRandomKey(c->dict);
+
+ while(1) {
+ de = dictGetRandomKey(c->db->dict);
+ 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);
int numkeys = 0, keyslen = 0;
robj *lenobj = createObject(REDIS_STRING,NULL);
- di = dictGetIterator(c->dict);
+ di = dictGetIterator(c->db->dict);
if (!di) oom("dictGetIterator");
addReply(c,lenobj);
decrRefCount(lenobj);
while((de = dictNext(di)) != NULL) {
robj *keyobj = dictGetEntryKey(de);
+
sds key = keyobj->ptr;
if ((pattern[0] == '*' && pattern[1] == '\0') ||
stringmatchlen(pattern,plen,key,sdslen(key),0)) {
- if (numkeys != 0)
- addReply(c,shared.space);
- addReply(c,keyobj);
- numkeys++;
- keyslen += sdslen(key);
+ if (expireIfNeeded(c->db,keyobj) == 0) {
+ if (numkeys != 0)
+ addReply(c,shared.space);
+ addReply(c,keyobj);
+ numkeys++;
+ keyslen += sdslen(key);
+ }
}
}
dictReleaseIterator(di);
static void dbsizeCommand(redisClient *c) {
addReplySds(c,
- sdscatprintf(sdsempty(),":%lu\r\n",dictGetHashTableUsed(c->dict)));
+ sdscatprintf(sdsempty(),":%lu\r\n",dictSize(c->db->dict)));
}
static void lastsaveCommand(redisClient *c) {
}
static void typeCommand(redisClient *c) {
- dictEntry *de;
+ robj *o;
char *type;
-
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+
+ o = lookupKeyRead(c->db,c->argv[1]);
+ if (o == NULL) {
type = "+none";
} else {
- robj *o = dictGetEntryVal(de);
-
switch(o->type) {
case REDIS_STRING: type = "+string"; break;
case REDIS_LIST: type = "+list"; break;
}
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 {
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 */
if (rdbSave(server.dbfilename) == REDIS_OK) {
if (server.daemonize) {
unlink(server.pidfile);
}
static void renameGenericCommand(redisClient *c, int nx) {
- dictEntry *de;
robj *o;
/* To use the same key as src and dst is probably an error */
return;
}
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ o = lookupKeyWrite(c->db,c->argv[1]);
+ if (o == NULL) {
addReply(c,shared.nokeyerr);
return;
}
- o = dictGetEntryVal(de);
incrRefCount(o);
- if (dictAdd(c->dict,c->argv[2],o) == DICT_ERR) {
+ deleteIfVolatile(c->db,c->argv[2]);
+ if (dictAdd(c->db->dict,c->argv[2],o) == DICT_ERR) {
if (nx) {
decrRefCount(o);
addReply(c,shared.czero);
return;
}
- dictReplace(c->dict,c->argv[2],o);
+ dictReplace(c->db->dict,c->argv[2],o);
} else {
incrRefCount(c->argv[2]);
}
- dictDelete(c->dict,c->argv[1]);
+ deleteKey(c->db,c->argv[1]);
server.dirty++;
addReply(c,nx ? shared.cone : shared.ok);
}
}
static void moveCommand(redisClient *c) {
- dictEntry *de;
- robj *o, *key;
- dict *src, *dst;
+ robj *o;
+ redisDb *src, *dst;
int srcid;
/* Obtain source and target DB pointers */
- src = c->dict;
- srcid = c->dictid;
+ src = c->db;
+ srcid = c->db->id;
if (selectDb(c,atoi(c->argv[2]->ptr)) == REDIS_ERR) {
addReply(c,shared.outofrangeerr);
return;
}
- dst = c->dict;
- c->dict = src;
- c->dictid = srcid;
+ dst = c->db;
+ selectDb(c,srcid); /* Back to the source DB */
/* If the user is moving using as target the same
* DB as the source DB it is probably an error. */
}
/* Check if the element exists and get a reference */
- de = dictFind(c->dict,c->argv[1]);
- if (!de) {
+ o = lookupKeyWrite(c->db,c->argv[1]);
+ if (!o) {
addReply(c,shared.czero);
return;
}
/* Try to add the element to the target DB */
- key = dictGetEntryKey(de);
- o = dictGetEntryVal(de);
- if (dictAdd(dst,key,o) == DICT_ERR) {
+ deleteIfVolatile(dst,c->argv[1]);
+ if (dictAdd(dst->dict,c->argv[1],o) == DICT_ERR) {
addReply(c,shared.czero);
return;
}
- incrRefCount(key);
+ incrRefCount(c->argv[1]);
incrRefCount(o);
/* OK! key moved, free the entry in the source DB */
- dictDelete(src,c->argv[1]);
+ deleteKey(src,c->argv[1]);
server.dirty++;
addReply(c,shared.cone);
}
/* =================================== Lists ================================ */
static void pushGenericCommand(redisClient *c, int where) {
robj *lobj;
- dictEntry *de;
list *list;
-
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+
+ lobj = lookupKeyWrite(c->db,c->argv[1]);
+ if (lobj == NULL) {
lobj = createListObject();
list = lobj->ptr;
if (where == REDIS_HEAD) {
} else {
if (!listAddNodeTail(list,c->argv[2])) oom("listAddNodeTail");
}
- dictAdd(c->dict,c->argv[1],lobj);
+ dictAdd(c->db->dict,c->argv[1],lobj);
incrRefCount(c->argv[1]);
incrRefCount(c->argv[2]);
} else {
- lobj = dictGetEntryVal(de);
if (lobj->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
return;
}
static void llenCommand(redisClient *c) {
- dictEntry *de;
+ robj *o;
list *l;
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ o = lookupKeyRead(c->db,c->argv[1]);
+ if (o == NULL) {
addReply(c,shared.czero);
return;
} else {
- robj *o = dictGetEntryVal(de);
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
}
static void lindexCommand(redisClient *c) {
- dictEntry *de;
+ robj *o;
int index = atoi(c->argv[2]->ptr);
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ o = lookupKeyRead(c->db,c->argv[1]);
+ if (o == NULL) {
addReply(c,shared.nullbulk);
} else {
- robj *o = dictGetEntryVal(de);
-
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
}
static void lsetCommand(redisClient *c) {
- dictEntry *de;
+ robj *o;
int index = atoi(c->argv[2]->ptr);
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ o = lookupKeyWrite(c->db,c->argv[1]);
+ if (o == NULL) {
addReply(c,shared.nokeyerr);
} else {
- robj *o = dictGetEntryVal(de);
-
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
}
static void popGenericCommand(redisClient *c, int where) {
- dictEntry *de;
-
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ robj *o;
+
+ o = lookupKeyWrite(c->db,c->argv[1]);
+ if (o == NULL) {
addReply(c,shared.nullbulk);
} else {
- robj *o = dictGetEntryVal(de);
-
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
}
static void lrangeCommand(redisClient *c) {
- dictEntry *de;
+ robj *o;
int start = atoi(c->argv[2]->ptr);
int end = atoi(c->argv[3]->ptr);
-
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+
+ o = lookupKeyRead(c->db,c->argv[1]);
+ if (o == NULL) {
addReply(c,shared.nullmultibulk);
} else {
- robj *o = dictGetEntryVal(de);
-
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
}
static void ltrimCommand(redisClient *c) {
- dictEntry *de;
+ robj *o;
int start = atoi(c->argv[2]->ptr);
int end = atoi(c->argv[3]->ptr);
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ o = lookupKeyWrite(c->db,c->argv[1]);
+ if (o == NULL) {
addReply(c,shared.nokeyerr);
} else {
- robj *o = dictGetEntryVal(de);
-
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
}
static void lremCommand(redisClient *c) {
- dictEntry *de;
+ robj *o;
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ o = lookupKeyWrite(c->db,c->argv[1]);
+ if (o == NULL) {
addReply(c,shared.nokeyerr);
} else {
- robj *o = dictGetEntryVal(de);
-
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
/* ==================================== Sets ================================ */
static void saddCommand(redisClient *c) {
- dictEntry *de;
robj *set;
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ set = lookupKeyWrite(c->db,c->argv[1]);
+ if (set == NULL) {
set = createSetObject();
- dictAdd(c->dict,c->argv[1],set);
+ dictAdd(c->db->dict,c->argv[1],set);
incrRefCount(c->argv[1]);
} else {
- set = dictGetEntryVal(de);
if (set->type != REDIS_SET) {
addReply(c,shared.wrongtypeerr);
return;
}
static void sremCommand(redisClient *c) {
- dictEntry *de;
+ robj *set;
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ set = lookupKeyWrite(c->db,c->argv[1]);
+ if (set == NULL) {
addReply(c,shared.czero);
} else {
- robj *set;
-
- set = dictGetEntryVal(de);
if (set->type != REDIS_SET) {
addReply(c,shared.wrongtypeerr);
return;
}
}
+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) {
- dictEntry *de;
+ robj *set;
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ set = lookupKeyRead(c->db,c->argv[1]);
+ if (set == NULL) {
addReply(c,shared.czero);
} else {
- robj *set;
-
- set = dictGetEntryVal(de);
if (set->type != REDIS_SET) {
addReply(c,shared.wrongtypeerr);
return;
}
static void scardCommand(redisClient *c) {
- dictEntry *de;
+ robj *o;
dict *s;
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ o = lookupKeyRead(c->db,c->argv[1]);
+ if (o == NULL) {
addReply(c,shared.czero);
return;
} else {
- robj *o = dictGetEntryVal(de);
if (o->type != REDIS_SET) {
addReply(c,shared.wrongtypeerr);
} else {
s = o->ptr;
addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",
- dictGetHashTableUsed(s)));
+ dictSize(s)));
}
}
}
static int qsortCompareSetsByCardinality(const void *s1, const void *s2) {
dict **d1 = (void*) s1, **d2 = (void*) s2;
- return dictGetHashTableUsed(*d1)-dictGetHashTableUsed(*d2);
+ return dictSize(*d1)-dictSize(*d2);
}
static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, robj *dstkey) {
if (!dv) oom("sinterCommand");
for (j = 0; j < setsnum; j++) {
robj *setobj;
- dictEntry *de;
-
- de = dictFind(c->dict,setskeys[j]);
- if (!de) {
+
+ setobj = dstkey ?
+ lookupKeyWrite(c->db,setskeys[j]) :
+ 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;
}
- setobj = dictGetEntryVal(de);
if (setobj->type != REDIS_SET) {
zfree(dv);
addReply(c,shared.wrongtypeerr);
/* If we have a target key where to store the resulting set
* create this key with an empty set inside */
dstset = createSetObject();
- dictDelete(c->dict,dstkey);
- dictAdd(c->dict,dstkey,dstset);
+ deleteKey(c->db,dstkey);
+ dictAdd(c->db->dict,dstkey,dstset);
incrRefCount(dstkey);
}
}
dictReleaseIterator(di);
- if (!dstkey)
+ if (!dstkey) {
lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",cardinality);
- else
+ } else {
addReply(c,shared.ok);
+ server.dirty++;
+ }
zfree(dv);
}
sinterGenericCommand(c,c->argv+2,c->argc-2,c->argv[1]);
}
+static void sunionGenericCommand(redisClient *c, robj **setskeys, int setsnum, robj *dstkey) {
+ dict **dv = zmalloc(sizeof(dict*)*setsnum);
+ dictIterator *di;
+ dictEntry *de;
+ robj *lenobj = NULL, *dstset = NULL;
+ int j, cardinality = 0;
+
+ if (!dv) oom("sunionCommand");
+ 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();
+
+ /* The first thing we should output is the total number of elements...
+ * since this is a multi-bulk write, but at this stage we don't know
+ * the intersection set size, so we use a trick, append an empty object
+ * to the output list and save the pointer to later modify it with the
+ * right length */
+ if (!dstkey) {
+ lenobj = createObject(REDIS_STRING,NULL);
+ addReply(c,lenobj);
+ decrRefCount(lenobj);
+ } else {
+ /* If we have a target key where to store the resulting set
+ * create this key with an empty set inside */
+ deleteKey(c->db,dstkey);
+ dictAdd(c->db->dict,dstkey,dstset);
+ incrRefCount(dstkey);
+ server.dirty++;
+ }
+
+ /* 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 (!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 (dictAdd(dstset->ptr,ele,NULL) == DICT_OK) {
+ incrRefCount(ele);
+ if (!dstkey) {
+ addReplySds(c,sdscatprintf(sdsempty(),
+ "$%d\r\n",sdslen(ele->ptr)));
+ addReply(c,ele);
+ addReply(c,shared.crlf);
+ cardinality++;
+ }
+ }
+ }
+ dictReleaseIterator(di);
+ }
+
+ if (!dstkey) {
+ lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",cardinality);
+ decrRefCount(dstset);
+ } else {
+ addReply(c,shared.ok);
+ server.dirty++;
+ }
+ zfree(dv);
+}
+
+static void sunionCommand(redisClient *c) {
+ sunionGenericCommand(c,c->argv+1,c->argc-1,NULL);
+}
+
+static void sunionstoreCommand(redisClient *c) {
+ sunionGenericCommand(c,c->argv+2,c->argc-2,c->argv[1]);
+}
+
static void flushdbCommand(redisClient *c) {
- dictEmpty(c->dict);
+ 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) {
/* Return the value associated to the key with a name obtained
* substituting the first occurence of '*' in 'pattern' with 'subst' */
-robj *lookupKeyByPattern(dict *dict, robj *pattern, robj *subst) {
+robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) {
char *p;
sds spat, ssub;
robj keyobj;
int prefixlen, sublen, postfixlen;
- dictEntry *de;
/* Expoit the internal sds representation to create a sds string allocated on the stack in order to make this function faster */
struct {
long len;
char buf[REDIS_SORTKEY_MAX+1];
} keyname;
-
spat = pattern->ptr;
ssub = subst->ptr;
if (sdslen(spat)+sdslen(ssub)-1 > REDIS_SORTKEY_MAX) return NULL;
keyobj.type = REDIS_STRING;
keyobj.ptr = ((char*)&keyname)+(sizeof(long)*2);
- de = dictFind(dict,&keyobj);
/* printf("lookup '%s' => %p\n", keyname.buf,de); */
- if (!de) return NULL;
- return dictGetEntryVal(de);
+ return lookupKeyRead(db,&keyobj);
}
/* sortCompare() is used by qsort in sortCommand(). Given that qsort_r with
/* The SORT command is the most complex command in Redis. Warning: this code
* is optimized for speed and a bit less for readability */
static void sortCommand(redisClient *c) {
- dictEntry *de;
list *operations;
int outputlen = 0;
int desc = 0, alpha = 0;
redisSortObject *vector; /* Resulting vector to sort */
/* Lookup the key to sort. It must be of the right types */
- de = dictFind(c->dict,c->argv[1]);
- if (de == NULL) {
+ sortval = lookupKeyRead(c->db,c->argv[1]);
+ if (sortval == NULL) {
addReply(c,shared.nokeyerr);
return;
}
- sortval = dictGetEntryVal(de);
if (sortval->type != REDIS_SET && sortval->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
return;
/* Load the sorting vector with all the objects to sort */
vectorlen = (sortval->type == REDIS_LIST) ?
listLength((list*)sortval->ptr) :
- dictGetHashTableUsed((dict*)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;
- 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 {
if (sortby) {
robj *byval;
- byval = lookupKeyByPattern(c->dict,sortby,vector[j].obj);
+ byval = lookupKeyByPattern(c->db,sortby,vector[j].obj);
if (!byval || byval->type != REDIS_STRING) continue;
if (alpha) {
vector[j].u.cmpobj = byval;
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->dict,sop->pattern,
+ robj *val = lookupKeyByPattern(c->db,sop->pattern,
vector[j].obj);
if (sop->type == REDIS_SORT_GET) {
} else if (sop->type == REDIS_SORT_DEL) {
/* TODO */
}
- ln = ln->next;
}
}
"redis_version:%s\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"
listLength(server.slaves),
server.usedmemory,
server.dirty,
+ server.bgsaveinprogress,
server.lastsave,
server.stat_numconnections,
server.stat_numcommands,
addReply(c,shared.crlf);
}
-/* =============================== Replication ============================= */
+static void monitorCommand(redisClient *c) {
+ /* ignore MONITOR if aleady slave or in monitor mode */
+ if (c->flags & REDIS_SLAVE) return;
-/* 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);
+ c->flags |= (REDIS_SLAVE|REDIS_MONITOR);
+ c->slaveseldb = 0;
+ if (!listAddNodeTail(server.monitors,c)) oom("listAddNodeTail");
+ addReply(c,shared.ok);
+}
- 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 ================================= */
+static int removeExpire(redisDb *db, robj *key) {
+ if (dictDelete(db->expires,key) == DICT_OK) {
+ return 1;
+ } else {
+ return 0;
}
- return REDIS_OK;
}
+static int setExpire(redisDb *db, robj *key, time_t when) {
+ if (dictAdd(db->expires,key,(void*)when) == DICT_ERR) {
+ return 0;
+ } else {
+ incrRefCount(key);
+ return 1;
+ }
+}
+
+/* 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;
+
+ /* No expire? return ASAP */
+ if (dictSize(db->expires) == 0 ||
+ (de = dictFind(db->expires,key)) == NULL) return 0;
+
+ /* Lookup the expire */
+ when = (time_t) dictGetEntryVal(de);
+ if (time(NULL) <= when) return 0;
+
+ /* Delete the key */
+ dictDelete(db->expires,key);
+ return dictDelete(db->dict,key) == DICT_OK;
+}
+
+static int deleteIfVolatile(redisDb *db, robj *key) {
+ dictEntry *de;
+
+ /* No expire? return ASAP */
+ if (dictSize(db->expires) == 0 ||
+ (de = dictFind(db->expires,key)) == NULL) return 0;
+
+ /* Delete the key */
+ server.dirty++;
+ dictDelete(db->expires,key);
+ return dictDelete(db->dict,key) == DICT_OK;
+}
+
+static void expireCommand(redisClient *c) {
+ dictEntry *de;
+ int seconds = atoi(c->argv[2]->ptr);
+
+ de = dictFind(c->db->dict,c->argv[1]);
+ if (de == NULL) {
+ addReply(c,shared.czero);
+ return;
+ }
+ if (seconds <= 0) {
+ addReply(c, shared.czero);
+ return;
+ } else {
+ time_t when = time(NULL)+seconds;
+ if (setExpire(c->db,c->argv[1],when))
+ addReply(c,shared.cone);
+ else
+ addReply(c,shared.czero);
+ return;
+ }
+}
+
+/* =============================== Replication ============================= */
+
static int syncWrite(int fd, char *ptr, ssize_t size, int timeout) {
ssize_t nwritten, ret = size;
time_t start = time(NULL);
}
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");
+ }
+}
+
+static void updateSalvesWaitingBgsave(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 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 ||
+ 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) {
return REDIS_OK;
}
-static void monitorCommand(redisClient *c) {
- /* ignore MONITOR if aleady slave or in monitor mode */
- if (c->flags & REDIS_SLAVE) return;
-
- c->flags |= (REDIS_SLAVE|REDIS_MONITOR);
- c->slaveseldb = 0;
- if (!listAddNodeTail(server.monitors,c)) oom("listAddNodeTail");
- addReply(c,shared.ok);
-}
-
/* =================================== Main! ================================ */
static void daemonize(void) {
projects / redis.git / blobdiff