* POSSIBILITY OF SUCH DAMAGE.
*/
-#define REDIS_VERSION "0.100"
+#define REDIS_VERSION "0.101"
#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"
+#include "lzf.h" /* LZF compression library */
+#include "pqsort.h" /* Partial qsort for SORT+LIMIT */
/* Error codes */
#define REDIS_OK 0
#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
int masterport;
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;
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 freeMemoryIfNeeded(void);
static void authCommand(redisClient *c);
static void pingCommand(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);
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);
/*================================= Globals ================================= */
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},
- {"sunion",sunionCommand,-2,REDIS_CMD_INLINE},
- {"sunionstore",sunionstoreCommand,-3,REDIS_CMD_INLINE},
+ {"sinter",sinterCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+ {"sinterstore",sinterstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+ {"sunion",sunionCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+ {"sunionstore",sunionstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+ {"sdiff",sdiffCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
+ {"sdiffstore",sdiffstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
{"smembers",sinterCommand,2,REDIS_CMD_INLINE},
- {"incrby",incrbyCommand,3,REDIS_CMD_INLINE},
- {"decrby",decrbyCommand,3,REDIS_CMD_INLINE},
- {"getset",getSetCommand,3,REDIS_CMD_BULK},
+ {"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},
{"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},
{NULL,NULL,0,0}
};
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);
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);
}
/* Close connections of timedout clients */
- if (!(loops % 10))
+ if (server.maxidletime && !(loops % 10))
closeTimedoutClients();
/* Check if a background saving in progress terminated */
server.dbfilename = "dump.rdb";
server.requirepass = NULL;
server.shareobjects = 0;
+ server.maxclients = 0;
+ server.maxmemory = 0;
ResetServerSaveParams();
appendServerSaveParams(60*60,1); /* save after 1 hour and 1 change */
/* Execute config directives */
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 (!strcasecmp(argv[0],"port") && argc == 2) {
if (server.dbnum < 1) {
err = "Invalid number of databases"; goto loaderr;
}
+ } else if (!strcasecmp(argv[0],"maxclients") && argc == 2) {
+ server.maxclients = atoi(argv[1]);
+ } else if (!strcasecmp(argv[0],"maxmemory") && argc == 2) {
+ server.maxmemory = atoi(argv[1]);
} else if (!strcasecmp(argv[0],"slaveof") && argc == 3) {
server.masterhost = sdsnew(argv[1]);
server.masterport = atoi(argv[2]);
if ((server.shareobjects = yesnotoi(argv[1])) == -1) {
err = "argument must be 'yes' or 'no'"; goto loaderr;
}
+ } else if (!strcasecmp(argv[0],"shareobjectspoolsize") && argc == 2) {
+ server.sharingpoolsize = atoi(argv[1]);
+ if (server.sharingpoolsize < 1) {
+ err = "invalid object sharing pool size"; goto loaderr;
+ }
} else if (!strcasecmp(argv[0],"daemonize") && argc == 2) {
if ((server.daemonize = yesnotoi(argv[1])) == -1) {
err = "argument must be 'yes' or 'no'"; goto loaderr;
listDelNode(c->reply,ln);
}
/* 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");
}
}
struct redisCommand *cmd;
long long dirty;
+ /* 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 (!strcasecmp(c->argv[0]->ptr,"quit")) {
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);
* on the query buffer try to process the next command. */
if (processCommand(c) && sdslen(c->querybuf)) goto again;
return;
- } else if (sdslen(c->querybuf) >= 1024) {
+ } else if (sdslen(c->querybuf) >= 1024*32) {
redisLog(REDIS_DEBUG, "Client protocol error");
freeClient(c);
return;
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);
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++;
}
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);
/* ========================= 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;
}
}
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;
/* 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
}
dictReleaseIterator(di);
+ 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);
+ addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",
+ dictSize((dict*)dstset->ptr)));
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) {
+#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 *lenobj = NULL, *dstset = NULL;
+ robj *dstset = NULL;
int j, cardinality = 0;
- if (!dv) oom("sunionCommand");
+ if (!dv) oom("sunionDiffGenericCommand");
for (j = 0; j < setsnum; j++) {
robj *setobj;
* 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 (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]);
/* 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(),
- "$%d\r\n",sdslen(ele->ptr)));
- addReply(c,ele);
- addReply(c,shared.crlf);
+ if (op == REDIS_OP_UNION || j == 0) {
+ if (dictAdd(dstset->ptr,ele,NULL) == DICT_OK) {
+ incrRefCount(ele);
cardinality++;
}
+ } else if (op == REDIS_OP_DIFF) {
+ if (dictDelete(dstset->ptr,ele) == DICT_OK) {
+ cardinality--;
+ }
}
}
dictReleaseIterator(di);
+
+ if (op == REDIS_OP_DIFF && cardinality == 0) break; /* result set is empty */
}
+ /* Output the content of the resulting set, if not in STORE mode */
+ if (!dstkey) {
+ addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",cardinality));
+ di = dictGetIterator(dstset->ptr);
+ if (!di) oom("dictGetIterator");
+ while((de = dictNext(di)) != NULL) {
+ robj *ele;
+
+ ele = dictGetEntryKey(de);
+ addReplySds(c,sdscatprintf(sdsempty(),
+ "$%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) {
- lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",cardinality);
decrRefCount(dstset);
} else {
- addReply(c,shared.ok);
+ addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",
+ dictSize((dict*)dstset->ptr)));
server.dirty++;
}
zfree(dv);
}
static void sunionCommand(redisClient *c) {
- sunionGenericCommand(c,c->argv+1,c->argc-1,NULL);
+ sunionDiffGenericCommand(c,c->argv+1,c->argc-1,NULL,REDIS_OP_UNION);
}
static void sunionstoreCommand(redisClient *c) {
- sunionGenericCommand(c,c->argv+2,c->argc-2,c->argv[1]);
+ 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.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
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:%zu\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.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)
+ );
+ }
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",sdslen(info)));
addReplySds(c,info);
addReply(c,shared.crlf);
}
}
+static void ttlCommand(redisClient *c) {
+ time_t expire;
+ int ttl = -1;
+
+ expire = getExpire(c->db,c->argv[1]);
+ if (expire != -1) {
+ ttl = (int) (expire-time(NULL));
+ if (ttl < 0) ttl = -1;
+ }
+ addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",ttl));
+}
+
/* =============================== Replication ============================= */
static int syncWrite(int fd, char *ptr, ssize_t size, int timeout) {
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));
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... */
+ }
+ }
+}
+
/* =================================== Main! ================================ */
#ifdef __linux__
} else if (argc > 2) {
fprintf(stderr,"Usage: ./redis-server [/path/to/redis.conf]\n");
exit(1);
+ } else {
+ redisLog(REDIS_WARNING,"Warning: no config file specified, using the default config. In order to specify a config file use 'redis-server /path/to/redis.conf'");
}
initServer();
if (server.daemonize) daemonize();
projects / redis.git / blobdiff