X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/6e9e463f8014cbde1eaabe4c59045471e1871b74..a737ada1e58e6cd75e2fc643e2e55778de17b2ef:/redis.c

diff --git a/redis.c b/redis.c
index 773b3657..78f5fac0 100644
--- a/redis.c
+++ b/redis.c
@@ -27,7 +27,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#define REDIS_VERSION "1.3.8"
+#define REDIS_VERSION "1.3.10"
 
 #include "fmacros.h"
 #include "config.h"
@@ -237,7 +237,9 @@ static char* strencoding[] = {
 
 /* We can print the stacktrace, so our assert is defined this way: */
 #define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e,__FILE__,__LINE__),_exit(1)))
+#define redisPanic(_e) _redisPanic(#_e,__FILE__,__LINE__),_exit(1)
 static void _redisAssert(char *estr, char *file, int line);
+static void _redisPanic(char *msg, char *file, int line);
 
 /*================================= Data types ============================== */
 
@@ -377,7 +379,6 @@ struct redisServer {
     char *dbfilename;
     char *appendfilename;
     char *requirepass;
-    int shareobjects;
     int rdbcompression;
     int activerehashing;
     /* Replication related */
@@ -514,8 +515,9 @@ struct sharedObjectsStruct {
     *outofrangeerr, *plus,
     *select0, *select1, *select2, *select3, *select4,
     *select5, *select6, *select7, *select8, *select9,
-    *messagebulk, *subscribebulk, *unsubscribebulk, *mbulk3,
-    *psubscribebulk, *punsubscribebulk, *integers[REDIS_SHARED_INTEGERS];
+    *messagebulk, *pmessagebulk, *subscribebulk, *unsubscribebulk, *mbulk3,
+    *mbulk4, *psubscribebulk, *punsubscribebulk,
+    *integers[REDIS_SHARED_INTEGERS];
 } shared;
 
 /* Global vars that are actally used as constants. The following double
@@ -556,6 +558,7 @@ static int rdbSaveBackground(char *filename);
 static robj *createStringObject(char *ptr, size_t len);
 static robj *dupStringObject(robj *o);
 static void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc);
+static void replicationFeedMonitors(list *monitors, int dictid, robj **argv, int argc);
 static void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc);
 static int syncWithMaster(void);
 static robj *tryObjectEncoding(robj *o);
@@ -620,12 +623,14 @@ static void freePubsubPattern(void *p);
 static int listMatchPubsubPattern(void *a, void *b);
 static int compareStringObjects(robj *a, robj *b);
 static void usage();
+static int rewriteAppendOnlyFileBackground(void);
 
 static void authCommand(redisClient *c);
 static void pingCommand(redisClient *c);
 static void echoCommand(redisClient *c);
 static void setCommand(redisClient *c);
 static void setnxCommand(redisClient *c);
+static void setexCommand(redisClient *c);
 static void getCommand(redisClient *c);
 static void delCommand(redisClient *c);
 static void existsCommand(redisClient *c);
@@ -734,6 +739,7 @@ static struct redisCommand cmdTable[] = {
     {"get",getCommand,2,REDIS_CMD_INLINE,NULL,1,1,1},
     {"set",setCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,NULL,0,0,0},
     {"setnx",setnxCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,NULL,0,0,0},
+    {"setex",setexCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,NULL,0,0,0},
     {"append",appendCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,NULL,1,1,1},
     {"substr",substrCommand,4,REDIS_CMD_INLINE,NULL,1,1,1},
     {"del",delCommand,-2,REDIS_CMD_INLINE,NULL,0,0,0},
@@ -968,6 +974,53 @@ static int stringmatch(const char *pattern, const char *string, int nocase) {
     return stringmatchlen(pattern,strlen(pattern),string,strlen(string),nocase);
 }
 
+/* Convert a string representing an amount of memory into the number of
+ * bytes, so for instance memtoll("1Gi") will return 1073741824 that is
+ * (1024*1024*1024).
+ *
+ * On parsing error, if *err is not NULL, it's set to 1, otherwise it's
+ * set to 0 */
+static long long memtoll(const char *p, int *err) {
+    const char *u;
+    char buf[128];
+    long mul; /* unit multiplier */
+    long long val;
+    unsigned int digits;
+
+    if (err) *err = 0;
+    /* Search the first non digit character. */
+    u = p;
+    if (*u == '-') u++;
+    while(*u && isdigit(*u)) u++;
+    if (*u == '\0' || !strcasecmp(u,"b")) {
+        mul = 1;
+    } else if (!strcasecmp(u,"k")) {
+        mul = 1000;
+    } else if (!strcasecmp(u,"kb")) {
+        mul = 1024;
+    } else if (!strcasecmp(u,"m")) {
+        mul = 1000*1000;
+    } else if (!strcasecmp(u,"mb")) {
+        mul = 1024*1024;
+    } else if (!strcasecmp(u,"g")) {
+        mul = 1000L*1000*1000;
+    } else if (!strcasecmp(u,"gb")) {
+        mul = 1024L*1024*1024;
+    } else {
+        if (err) *err = 1;
+        mul = 1;
+    }
+    digits = u-p;
+    if (digits >= sizeof(buf)) {
+        if (err) *err = 1;
+        return LLONG_MAX;
+    }
+    memcpy(buf,p,digits);
+    buf[digits] = '\0';
+    val = strtoll(buf,NULL,10);
+    return val*mul;
+}
+
 static void redisLog(int level, const char *fmt, ...) {
     va_list ap;
     FILE *fp;
@@ -1465,6 +1518,7 @@ static int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientD
         redisLog(REDIS_NOTICE,"Connecting to MASTER...");
         if (syncWithMaster() == REDIS_OK) {
             redisLog(REDIS_NOTICE,"MASTER <-> SLAVE sync succeeded");
+            if (server.appendonly) rewriteAppendOnlyFileBackground();
         }
     }
     return 100;
@@ -1540,11 +1594,13 @@ static void createSharedObjects(void) {
     shared.select8 = createStringObject("select 8\r\n",10);
     shared.select9 = createStringObject("select 9\r\n",10);
     shared.messagebulk = createStringObject("$7\r\nmessage\r\n",13);
+    shared.pmessagebulk = createStringObject("$8\r\npmessage\r\n",14);
     shared.subscribebulk = createStringObject("$9\r\nsubscribe\r\n",15);
     shared.unsubscribebulk = createStringObject("$11\r\nunsubscribe\r\n",18);
     shared.psubscribebulk = createStringObject("$10\r\npsubscribe\r\n",17);
     shared.punsubscribebulk = createStringObject("$12\r\npunsubscribe\r\n",19);
     shared.mbulk3 = createStringObject("*3\r\n",4);
+    shared.mbulk4 = createStringObject("*4\r\n",4);
     for (j = 0; j < REDIS_SHARED_INTEGERS; j++) {
         shared.integers[j] = createObject(REDIS_STRING,(void*)(long)j);
         shared.integers[j]->encoding = REDIS_ENCODING_INT;
@@ -1583,7 +1639,6 @@ static void initServerConfig() {
     server.dbfilename = zstrdup("dump.rdb");
     server.appendfilename = zstrdup("appendonly.aof");
     server.requirepass = NULL;
-    server.shareobjects = 0;
     server.rdbcompression = 1;
     server.activerehashing = 1;
     server.maxclients = 0;
@@ -1800,7 +1855,7 @@ static void loadServerConfig(char *filename) {
         } else if (!strcasecmp(argv[0],"maxclients") && argc == 2) {
             server.maxclients = atoi(argv[1]);
         } else if (!strcasecmp(argv[0],"maxmemory") && argc == 2) {
-            server.maxmemory = strtoll(argv[1], NULL, 10);
+            server.maxmemory = memtoll(argv[1],NULL);
         } else if (!strcasecmp(argv[0],"slaveof") && argc == 3) {
             server.masterhost = sdsnew(argv[1]);
             server.masterport = atoi(argv[2]);
@@ -1811,10 +1866,6 @@ static void loadServerConfig(char *filename) {
             if ((server.glueoutputbuf = yesnotoi(argv[1])) == -1) {
                 err = "argument must be 'yes' or 'no'"; goto loaderr;
             }
-        } 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 (!strcasecmp(argv[0],"rdbcompression") && argc == 2) {
             if ((server.rdbcompression = yesnotoi(argv[1])) == -1) {
                 err = "argument must be 'yes' or 'no'"; goto loaderr;
@@ -1858,19 +1909,17 @@ static void loadServerConfig(char *filename) {
             zfree(server.vm_swap_file);
             server.vm_swap_file = zstrdup(argv[1]);
         } else if (!strcasecmp(argv[0],"vm-max-memory") && argc == 2) {
-            server.vm_max_memory = strtoll(argv[1], NULL, 10);
+            server.vm_max_memory = memtoll(argv[1],NULL);
         } else if (!strcasecmp(argv[0],"vm-page-size") && argc == 2) {
-            server.vm_page_size = strtoll(argv[1], NULL, 10);
+            server.vm_page_size = memtoll(argv[1], NULL);
         } else if (!strcasecmp(argv[0],"vm-pages") && argc == 2) {
-            server.vm_pages = strtoll(argv[1], NULL, 10);
+            server.vm_pages = memtoll(argv[1], NULL);
         } else if (!strcasecmp(argv[0],"vm-max-threads") && argc == 2) {
             server.vm_max_threads = strtoll(argv[1], NULL, 10);
         } else if (!strcasecmp(argv[0],"hash-max-zipmap-entries") && argc == 2){
-            server.hash_max_zipmap_entries = strtol(argv[1], NULL, 10);
+            server.hash_max_zipmap_entries = memtoll(argv[1], NULL);
         } else if (!strcasecmp(argv[0],"hash-max-zipmap-value") && argc == 2){
-            server.hash_max_zipmap_value = strtol(argv[1], NULL, 10);
-        } else if (!strcasecmp(argv[0],"vm-max-threads") && argc == 2) {
-            server.vm_max_threads = strtoll(argv[1], NULL, 10);
+            server.hash_max_zipmap_value = memtoll(argv[1], NULL);
         } else {
             err = "Bad directive or wrong number of arguments"; goto loaderr;
         }
@@ -2164,7 +2213,7 @@ static void call(redisClient *c, struct redisCommand *cmd) {
         listLength(server.slaves))
         replicationFeedSlaves(server.slaves,c->db->id,c->argv,c->argc);
     if (listLength(server.monitors))
-        replicationFeedSlaves(server.monitors,c->db->id,c->argv,c->argc);
+        replicationFeedMonitors(server.monitors,c->db->id,c->argv,c->argc);
     server.stat_numcommands++;
 }
 
@@ -2419,6 +2468,64 @@ static void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int arg
     if (outv != static_outv) zfree(outv);
 }
 
+static sds sdscatrepr(sds s, char *p, size_t len) {
+    s = sdscatlen(s,"\"",1);
+    while(len--) {
+        switch(*p) {
+        case '\\':
+        case '"':
+            s = sdscatprintf(s,"\\%c",*p);
+            break;
+        case '\n': s = sdscatlen(s,"\\n",1); break;
+        case '\r': s = sdscatlen(s,"\\r",1); break;
+        case '\t': s = sdscatlen(s,"\\t",1); break;
+        case '\a': s = sdscatlen(s,"\\a",1); break;
+        case '\b': s = sdscatlen(s,"\\b",1); break;
+        default:
+            if (isprint(*p))
+                s = sdscatprintf(s,"%c",*p);
+            else
+                s = sdscatprintf(s,"\\x%02x",(unsigned char)*p);
+            break;
+        }
+        p++;
+    }
+    return sdscatlen(s,"\"",1);
+}
+
+static void replicationFeedMonitors(list *monitors, int dictid, robj **argv, int argc) {
+    listNode *ln;
+    listIter li;
+    int j;
+    sds cmdrepr = sdsnew("+");
+    robj *cmdobj;
+    struct timeval tv;
+
+    gettimeofday(&tv,NULL);
+    cmdrepr = sdscatprintf(cmdrepr,"%ld.%ld ",(long)tv.tv_sec,(long)tv.tv_usec);
+    if (dictid != 0) cmdrepr = sdscatprintf(cmdrepr,"(db %d) ", dictid);
+
+    for (j = 0; j < argc; j++) {
+        if (argv[j]->encoding == REDIS_ENCODING_INT) {
+            cmdrepr = sdscatprintf(cmdrepr, "%ld", (long)argv[j]->ptr);
+        } else {
+            cmdrepr = sdscatrepr(cmdrepr,(char*)argv[j]->ptr,
+                        sdslen(argv[j]->ptr));
+        }
+        if (j != argc-1)
+            cmdrepr = sdscatlen(cmdrepr," ",1);
+    }
+    cmdrepr = sdscatlen(cmdrepr,"\r\n",2);
+    cmdobj = createObject(REDIS_STRING,cmdrepr);
+
+    listRewind(monitors,&li);
+    while((ln = listNext(&li))) {
+        redisClient *monitor = ln->value;
+        addReply(monitor,cmdobj);
+    }
+    decrRefCount(cmdobj);
+}
+
 static void processInputBuffer(redisClient *c) {
 again:
     /* Before to process the input buffer, make sure the client is not
@@ -2773,6 +2880,23 @@ static robj *createStringObject(char *ptr, size_t len) {
     return createObject(REDIS_STRING,sdsnewlen(ptr,len));
 }
 
+static robj *createStringObjectFromLongLong(long long value) {
+    robj *o;
+    if (value >= 0 && value < REDIS_SHARED_INTEGERS) {
+        incrRefCount(shared.integers[value]);
+        o = shared.integers[value];
+    } else {
+        o = createObject(REDIS_STRING, NULL);
+        if (value >= LONG_MIN && value <= LONG_MAX) {
+            o->encoding = REDIS_ENCODING_INT;
+            o->ptr = (void*)((long)value);
+        } else {
+            o->ptr = sdscatprintf(sdsempty(),"%lld",value);
+        }
+    }
+    return o;
+}
+
 static robj *dupStringObject(robj *o) {
     assert(o->encoding == REDIS_ENCODING_RAW);
     return createStringObject(o->ptr,sdslen(o->ptr));
@@ -2839,7 +2963,7 @@ static void freeHashObject(robj *o) {
         zfree(o->ptr);
         break;
     default:
-        redisAssert(0);
+        redisPanic("Unknown hash encoding type");
         break;
     }
 }
@@ -2851,6 +2975,7 @@ static void incrRefCount(robj *o) {
 static void decrRefCount(void *obj) {
     robj *o = obj;
 
+    if (o->refcount <= 0) redisPanic("decrRefCount against refcount <= 0");
     /* Object is a key of a swapped out value, or in the process of being
      * loaded. */
     if (server.vm_enabled &&
@@ -2878,7 +3003,7 @@ static void decrRefCount(void *obj) {
         case REDIS_SET: freeSetObject(o); break;
         case REDIS_ZSET: freeZsetObject(o); break;
         case REDIS_HASH: freeHashObject(o); break;
-        default: redisAssert(0); break;
+        default: redisPanic("Unknown object type"); break;
         }
         if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
         if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
@@ -3038,7 +3163,7 @@ static robj *getDecodedObject(robj *o) {
         dec = createStringObject(buf,strlen(buf));
         return dec;
     } else {
-        redisAssert(1 != 1);
+        redisPanic("Unknown encoding type");
     }
 }
 
@@ -3084,74 +3209,94 @@ static size_t stringObjectLen(robj *o) {
     }
 }
 
-static int getDoubleFromObject(redisClient *c, robj *o, double *value) {
-    double parsedValue;
-    char *eptr = NULL;
+static int getDoubleFromObject(robj *o, double *target) {
+    double value;
+    char *eptr;
 
-    if (o && o->type != REDIS_STRING) {
-        addReplySds(c,sdsnew("-ERR value is not a double\r\n"));
-        return REDIS_ERR;
+    if (o == NULL) {
+        value = 0;
+    } else {
+        redisAssert(o->type == REDIS_STRING);
+        if (o->encoding == REDIS_ENCODING_RAW) {
+            value = strtod(o->ptr, &eptr);
+            if (eptr[0] != '\0') return REDIS_ERR;
+        } else if (o->encoding == REDIS_ENCODING_INT) {
+            value = (long)o->ptr;
+        } else {
+            redisAssert(1 != 1);
+        }
     }
 
-    if (o == NULL)
-        parsedValue = 0;
-    else if (o->encoding == REDIS_ENCODING_RAW)
-        parsedValue = strtod(o->ptr, &eptr);
-    else if (o->encoding == REDIS_ENCODING_INT)
-        parsedValue = (long)o->ptr;
-    else
-        redisAssert(1 != 1);
+    *target = value;
+    return REDIS_OK;
+}
 
-    if (eptr != NULL && *eptr != '\0') {
-        addReplySds(c,sdsnew("-ERR value is not a double\r\n"));
+static int getDoubleFromObjectOrReply(redisClient *c, robj *o, double *target, const char *msg) {
+    double value;
+    if (getDoubleFromObject(o, &value) != REDIS_OK) {
+        if (msg != NULL) {
+            addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
+        } else {
+            addReplySds(c, sdsnew("-ERR value is not a double\r\n"));
+        }
         return REDIS_ERR;
     }
 
-    *value = parsedValue;
-
+    *target = value;
     return REDIS_OK;
 }
 
-static int getLongLongFromObject(redisClient *c, robj *o, long long *value) {
-    long long parsedValue;
-    char *eptr = NULL;
+static int getLongLongFromObject(robj *o, long long *target) {
+    long long value;
+    char *eptr;
 
-    if (o && o->type != REDIS_STRING) {
-        addReplySds(c,sdsnew("-ERR value is not an integer\r\n"));
-        return REDIS_ERR;
+    if (o == NULL) {
+        value = 0;
+    } else {
+        redisAssert(o->type == REDIS_STRING);
+        if (o->encoding == REDIS_ENCODING_RAW) {
+            value = strtoll(o->ptr, &eptr, 10);
+            if (eptr[0] != '\0') return REDIS_ERR;
+        } else if (o->encoding == REDIS_ENCODING_INT) {
+            value = (long)o->ptr;
+        } else {
+            redisAssert(1 != 1);
+        }
     }
 
-    if (o == NULL)
-        parsedValue = 0;
-    else if (o->encoding == REDIS_ENCODING_RAW)
-        parsedValue = strtoll(o->ptr, &eptr, 10);
-    else if (o->encoding == REDIS_ENCODING_INT)
-        parsedValue = (long)o->ptr;
-    else
-        redisAssert(1 != 1);
+    *target = value;
+    return REDIS_OK;
+}
 
-    if (eptr != NULL && *eptr != '\0') {
-        addReplySds(c,sdsnew("-ERR value is not an integer\r\n"));
+static int getLongLongFromObjectOrReply(redisClient *c, robj *o, long long *target, const char *msg) {
+    long long value;
+    if (getLongLongFromObject(o, &value) != REDIS_OK) {
+        if (msg != NULL) {
+            addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
+        } else {
+            addReplySds(c, sdsnew("-ERR value is not an integer\r\n"));
+        }
         return REDIS_ERR;
     }
 
-    *value = parsedValue;
-
+    *target = value;
     return REDIS_OK;
 }
 
-static int getLongFromObject(redisClient *c, robj *o, long *value) {
-    long long actualValue;
-
-    if (getLongLongFromObject(c, o, &actualValue) != REDIS_OK) return REDIS_ERR;
+static int getLongFromObjectOrReply(redisClient *c, robj *o, long *target, const char *msg) {
+    long long value;
 
-    if (actualValue < LONG_MIN || actualValue > LONG_MAX) {
-        addReplySds(c,sdsnew("-ERR value is out of range\r\n"));
+    if (getLongLongFromObjectOrReply(c, o, &value, msg) != REDIS_OK) return REDIS_ERR;
+    if (value < LONG_MIN || value > LONG_MAX) {
+        if (msg != NULL) {
+            addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
+        } else {
+            addReplySds(c, sdsnew("-ERR value is out of range\r\n"));
+        }
         return REDIS_ERR;
     }
 
-    *value = actualValue;
-
+    *target = value;
     return REDIS_OK;
 }
 
@@ -3408,7 +3553,7 @@ static int rdbSaveObject(FILE *fp, robj *o) {
             dictReleaseIterator(di);
         }
     } else {
-        redisAssert(0);
+        redisPanic("Unknown object type");
     }
     return 0;
 }
@@ -3629,7 +3774,7 @@ static robj *rdbLoadIntegerObject(FILE *fp, int enctype) {
         val = (int32_t)v;
     } else {
         val = 0; /* anti-warning */
-        redisAssert(0);
+        redisPanic("Unknown RDB integer encoding type");
     }
     return createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",val));
 }
@@ -3668,7 +3813,7 @@ static robj *rdbLoadStringObject(FILE*fp) {
         case REDIS_RDB_ENC_LZF:
             return rdbLoadLzfStringObject(fp);
         default:
-            redisAssert(0);
+            redisPanic("Unknown RDB encoding type");
         }
     }
 
@@ -3790,7 +3935,7 @@ static robj *rdbLoadObject(int type, FILE *fp) {
             }
         }
     } else {
-        redisAssert(0);
+        redisPanic("Unknown object type");
     }
     return o;
 }
@@ -3902,40 +4047,55 @@ static void echoCommand(redisClient *c) {
 
 /*=================================== Strings =============================== */
 
-static void setGenericCommand(redisClient *c, int nx) {
+static void setGenericCommand(redisClient *c, int nx, robj *key, robj *val, robj *expire) {
     int retval;
+    long seconds;
 
-    if (nx) deleteIfVolatile(c->db,c->argv[1]);
-    retval = dictAdd(c->db->dict,c->argv[1],c->argv[2]);
+    if (expire) {
+        if (getLongFromObjectOrReply(c, expire, &seconds, NULL) != REDIS_OK)
+            return;
+        if (seconds <= 0) {
+            addReplySds(c,sdsnew("-ERR invalid expire time in SETEX\r\n"));
+            return;
+        }
+    }
+
+    if (nx) deleteIfVolatile(c->db,key);
+    retval = dictAdd(c->db->dict,key,val);
     if (retval == DICT_ERR) {
         if (!nx) {
             /* If the key is about a swapped value, we want a new key object
              * to overwrite the old. So we delete the old key in the database.
              * This will also make sure that swap pages about the old object
              * will be marked as free. */
-            if (server.vm_enabled && deleteIfSwapped(c->db,c->argv[1]))
-                incrRefCount(c->argv[1]);
-            dictReplace(c->db->dict,c->argv[1],c->argv[2]);
-            incrRefCount(c->argv[2]);
+            if (server.vm_enabled && deleteIfSwapped(c->db,key))
+                incrRefCount(key);
+            dictReplace(c->db->dict,key,val);
+            incrRefCount(val);
         } else {
             addReply(c,shared.czero);
             return;
         }
     } else {
-        incrRefCount(c->argv[1]);
-        incrRefCount(c->argv[2]);
+        incrRefCount(key);
+        incrRefCount(val);
     }
     server.dirty++;
-    removeExpire(c->db,c->argv[1]);
+    removeExpire(c->db,key);
+    if (expire) setExpire(c->db,key,time(NULL)+seconds);
     addReply(c, nx ? shared.cone : shared.ok);
 }
 
 static void setCommand(redisClient *c) {
-    setGenericCommand(c,0);
+    setGenericCommand(c,0,c->argv[1],c->argv[2],NULL);
 }
 
 static void setnxCommand(redisClient *c) {
-    setGenericCommand(c,1);
+    setGenericCommand(c,1,c->argv[1],c->argv[2],NULL);
+}
+
+static void setexCommand(redisClient *c) {
+    setGenericCommand(c,0,c->argv[1],c->argv[3],c->argv[2]);
 }
 
 static int getGenericCommand(redisClient *c) {
@@ -4041,7 +4201,7 @@ static void incrDecrCommand(redisClient *c, long long incr) {
 
     o = lookupKeyWrite(c->db,c->argv[1]);
 
-    if (getLongLongFromObject(c, o, &value) != REDIS_OK) return;
+    if (getLongLongFromObjectOrReply(c, o, &value, NULL) != REDIS_OK) return;
 
     value += incr;
     o = createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",value));
@@ -4070,16 +4230,14 @@ static void decrCommand(redisClient *c) {
 static void incrbyCommand(redisClient *c) {
     long long incr;
 
-    if (getLongLongFromObject(c, c->argv[2], &incr) != REDIS_OK) return;
-
+    if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
     incrDecrCommand(c,incr);
 }
 
 static void decrbyCommand(redisClient *c) {
     long long incr;
 
-    if (getLongLongFromObject(c, c->argv[2], &incr) != REDIS_OK) return;
-
+    if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
     incrDecrCommand(c,-incr);
 }
 
@@ -4196,18 +4354,25 @@ static void selectCommand(redisClient *c) {
 
 static void randomkeyCommand(redisClient *c) {
     dictEntry *de;
+    robj *key;
 
     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);
+        addReply(c,shared.nullbulk);
+        return;
+    }
+
+    key = dictGetEntryKey(de);
+    if (server.vm_enabled) {
+        key = dupStringObject(key);
+        addReplyBulk(c,key);
+        decrRefCount(key);
     } else {
-        addReply(c,shared.plus);
-        addReply(c,dictGetEntryKey(de));
-        addReply(c,shared.crlf);
+        addReplyBulk(c,key);
     }
 }
 
@@ -5477,16 +5642,14 @@ static void zaddGenericCommand(redisClient *c, robj *key, robj *ele, double scor
 static void zaddCommand(redisClient *c) {
     double scoreval;
 
-    if (getDoubleFromObject(c, c->argv[2], &scoreval) != REDIS_OK) return;
-
+    if (getDoubleFromObjectOrReply(c, c->argv[2], &scoreval, NULL) != REDIS_OK) return;
     zaddGenericCommand(c,c->argv[1],c->argv[3],scoreval,0);
 }
 
 static void zincrbyCommand(redisClient *c) {
     double scoreval;
 
-    if (getDoubleFromObject(c, c->argv[2], &scoreval) != REDIS_OK) return;
-
+    if (getDoubleFromObjectOrReply(c, c->argv[2], &scoreval, NULL) != REDIS_OK) return;
     zaddGenericCommand(c,c->argv[1],c->argv[3],scoreval,1);
 }
 
@@ -5526,8 +5689,8 @@ static void zremrangebyscoreCommand(redisClient *c) {
     robj *zsetobj;
     zset *zs;
 
-    if ((getDoubleFromObject(c, c->argv[2], &min) != REDIS_OK) ||
-        (getDoubleFromObject(c, c->argv[3], &max) != REDIS_OK)) return;
+    if ((getDoubleFromObjectOrReply(c, c->argv[2], &min, NULL) != REDIS_OK) ||
+        (getDoubleFromObjectOrReply(c, c->argv[3], &max, NULL) != REDIS_OK)) return;
 
     if ((zsetobj = lookupKeyWriteOrReply(c,c->argv[1],shared.czero)) == NULL ||
         checkType(c,zsetobj,REDIS_ZSET)) return;
@@ -5548,8 +5711,8 @@ static void zremrangebyrankCommand(redisClient *c) {
     robj *zsetobj;
     zset *zs;
 
-    if ((getLongFromObject(c, c->argv[2], &start) != REDIS_OK) ||
-        (getLongFromObject(c, c->argv[3], &end) != REDIS_OK)) return;
+    if ((getLongFromObjectOrReply(c, c->argv[2], &start, NULL) != REDIS_OK) ||
+        (getLongFromObjectOrReply(c, c->argv[3], &end, NULL) != REDIS_OK)) return;
 
     if ((zsetobj = lookupKeyWriteOrReply(c,c->argv[1],shared.czero)) == NULL ||
         checkType(c,zsetobj,REDIS_ZSET)) return;
@@ -5604,7 +5767,7 @@ inline static void zunionInterAggregate(double *target, double val, int aggregat
         *target = val > *target ? val : *target;
     } else {
         /* safety net */
-        redisAssert(0 != 0);
+        redisPanic("Unknown ZUNION/INTER aggregate type");
     }
 }
 
@@ -5657,7 +5820,7 @@ static void zunionInterGenericCommand(redisClient *c, robj *dstkey, int op) {
             if (remaining >= (zsetnum + 1) && !strcasecmp(c->argv[j]->ptr,"weights")) {
                 j++; remaining--;
                 for (i = 0; i < zsetnum; i++, j++, remaining--) {
-                    if (getDoubleFromObject(c, c->argv[j], &src[i].weight) != REDIS_OK)
+                    if (getDoubleFromObjectOrReply(c, c->argv[j], &src[i].weight, NULL) != REDIS_OK)
                         return;
                 }
             } else if (remaining >= 2 && !strcasecmp(c->argv[j]->ptr,"aggregate")) {
@@ -5790,8 +5953,8 @@ static void zrangeGenericCommand(redisClient *c, int reverse) {
     zskiplistNode *ln;
     robj *ele;
 
-    if ((getLongFromObject(c, c->argv[2], &start) != REDIS_OK) ||
-        (getLongFromObject(c, c->argv[3], &end) != REDIS_OK)) return;
+    if ((getLongFromObjectOrReply(c, c->argv[2], &start, NULL) != REDIS_OK) ||
+        (getLongFromObjectOrReply(c, c->argv[3], &end, NULL) != REDIS_OK)) return;
 
     if (c->argc == 5 && !strcasecmp(c->argv[4]->ptr,"withscores")) {
         withscores = 1;
@@ -6065,11 +6228,17 @@ static void hashTryConversion(robj *subject, robj **argv, int start, int end) {
     }
 }
 
+/* Encode given objects in-place when the hash uses a dict. */
+static void hashTryObjectEncoding(robj *subject, robj **o1, robj **o2) {
+    if (subject->encoding == REDIS_ENCODING_HT) {
+        if (o1) *o1 = tryObjectEncoding(*o1);
+        if (o2) *o2 = tryObjectEncoding(*o2);
+    }
+}
+
 /* Get the value from a hash identified by key. Returns either a string
- * object or NULL if the value cannot be found.
- * Note: the refcount for objects retrieved from a zipmap is set to 0.
- * This is done, so addReply will increment and clean up the object.
- * Make sure to clean up the object when it isn't added to a reply. */
+ * object or NULL if the value cannot be found. The refcount of the object
+ * is always increased by 1 when the value was found. */
 static robj *hashGet(robj *o, robj *key) {
     robj *value = NULL;
     if (o->encoding == REDIS_ENCODING_ZIPMAP) {
@@ -6078,13 +6247,13 @@ static robj *hashGet(robj *o, robj *key) {
         key = getDecodedObject(key);
         if (zipmapGet(o->ptr,key->ptr,sdslen(key->ptr),&v,&vlen)) {
             value = createStringObject((char*)v,vlen);
-            value->refcount = 0;
         }
         decrRefCount(key);
     } else {
         dictEntry *de = dictFind(o->ptr,key);
         if (de != NULL) {
             value = dictGetEntryVal(de);
+            incrRefCount(value);
         }
     }
     return value;
@@ -6110,7 +6279,7 @@ static int hashExists(robj *o, robj *key) {
 
 /* Add an element, discard the old if the key already exists.
  * Return 0 on insert and 1 on update. */
-static int hashReplace(robj *o, robj *key, robj *value) {
+static int hashSet(robj *o, robj *key, robj *value) {
     int update = 0;
     if (o->encoding == REDIS_ENCODING_ZIPMAP) {
         key = getDecodedObject(key);
@@ -6125,7 +6294,6 @@ static int hashReplace(robj *o, robj *key, robj *value) {
         if (zipmapLen(o->ptr) > server.hash_max_zipmap_entries)
             convertToRealHash(o);
     } else {
-        value = tryObjectEncoding(value);
         if (dictReplace(o->ptr,key,value)) {
             /* Insert */
             incrRefCount(key);
@@ -6155,7 +6323,7 @@ static int hashDelete(robj *o, robj *key) {
 }
 
 /* Return the number of elements in a hash. */
-static inline unsigned long hashLength(robj *o) {
+static unsigned long hashLength(robj *o) {
     return (o->encoding == REDIS_ENCODING_ZIPMAP) ?
         zipmapLen((unsigned char*)o->ptr) : dictSize((dict*)o->ptr);
 }
@@ -6174,7 +6342,8 @@ typedef struct {
     dictEntry *de;
 } hashIterator;
 
-static void hashInitIterator(robj *subject, hashIterator *hi) {
+static hashIterator *hashInitIterator(robj *subject) {
+    hashIterator *hi = zmalloc(sizeof(hashIterator));
     hi->encoding = subject->encoding;
     if (hi->encoding == REDIS_ENCODING_ZIPMAP) {
         hi->zi = zipmapRewind(subject->ptr);
@@ -6183,17 +6352,19 @@ static void hashInitIterator(robj *subject, hashIterator *hi) {
     } else {
         redisAssert(NULL);
     }
+    return hi;
 }
 
 static void hashReleaseIterator(hashIterator *hi) {
     if (hi->encoding == REDIS_ENCODING_HT) {
         dictReleaseIterator(hi->di);
     }
+    zfree(hi);
 }
 
 /* Move to the next entry in the hash. Return REDIS_OK when the next entry
  * could be found and REDIS_ERR when the iterator reaches the end. */
-static inline int hashNext(hashIterator *hi) {
+static int hashNext(hashIterator *hi) {
     if (hi->encoding == REDIS_ENCODING_ZIPMAP) {
         if ((hi->zi = zipmapNext(hi->zi, &hi->zk, &hi->zklen,
             &hi->zv, &hi->zvlen)) == NULL) return REDIS_ERR;
@@ -6204,9 +6375,8 @@ static inline int hashNext(hashIterator *hi) {
 }
 
 /* Get key or value object at current iteration position.
- * See comments at hashGet for a discussion on the refcount for
- * keys and values retrieved from zipmaps. */
-static inline robj *hashCurrent(hashIterator *hi, int what) {
+ * This increases the refcount of the field object by 1. */
+static robj *hashCurrent(hashIterator *hi, int what) {
     robj *o;
     if (hi->encoding == REDIS_ENCODING_ZIPMAP) {
         if (what & REDIS_HASH_KEY) {
@@ -6214,13 +6384,13 @@ static inline robj *hashCurrent(hashIterator *hi, int what) {
         } else {
             o = createStringObject((char*)hi->zv,hi->zvlen);
         }
-        o->refcount = 0;
     } else {
         if (what & REDIS_HASH_KEY) {
             o = dictGetEntryKey(hi->de);
         } else {
             o = dictGetEntryVal(hi->de);
         }
+        incrRefCount(o);
     }
     return o;
 }
@@ -6247,7 +6417,8 @@ static void hsetCommand(redisClient *c) {
 
     if ((o = hashLookupWriteOrCreate(c,c->argv[1])) == NULL) return;
     hashTryConversion(o,c->argv,2,3);
-    update = hashReplace(o,c->argv[2],c->argv[3]);
+    hashTryObjectEncoding(o,&c->argv[2], &c->argv[3]);
+    update = hashSet(o,c->argv[2],c->argv[3]);
     addReply(c, update ? shared.czero : shared.cone);
     server.dirty++;
 }
@@ -6260,7 +6431,8 @@ static void hsetnxCommand(redisClient *c) {
     if (hashExists(o, c->argv[2])) {
         addReply(c, shared.czero);
     } else {
-        hashReplace(o,c->argv[2],c->argv[3]);
+        hashTryObjectEncoding(o,&c->argv[2], &c->argv[3]);
+        hashSet(o,c->argv[2],c->argv[3]);
         addReply(c, shared.cone);
         server.dirty++;
     }
@@ -6278,16 +6450,18 @@ static void hmsetCommand(redisClient *c) {
     if ((o = hashLookupWriteOrCreate(c,c->argv[1])) == NULL) return;
     hashTryConversion(o,c->argv,2,c->argc-1);
     for (i = 2; i < c->argc; i += 2) {
-        hashReplace(o,c->argv[i],c->argv[i+1]);
+        hashTryObjectEncoding(o,&c->argv[i], &c->argv[i+1]);
+        hashSet(o,c->argv[i],c->argv[i+1]);
     }
     addReply(c, shared.ok);
+    server.dirty++;
 }
 
 static void hincrbyCommand(redisClient *c) {
     long long value, incr;
     robj *o, *current, *new;
 
-    if (getLongLongFromObject(c,c->argv[3],&incr) != REDIS_OK) return;
+    if (getLongLongFromObjectOrReply(c,c->argv[3],&incr,NULL) != REDIS_OK) return;
     if ((o = hashLookupWriteOrCreate(c,c->argv[1])) == NULL) return;
     if ((current = hashGet(o,c->argv[2])) != NULL) {
         if (current->encoding == REDIS_ENCODING_RAW)
@@ -6296,19 +6470,15 @@ static void hincrbyCommand(redisClient *c) {
             value = (long)current->ptr;
         else
             redisAssert(1 != 1);
-
-        /* clean up object when it was retrieved from a zipmap */
-        if (current->refcount == 0) {
-            current->refcount = 1;
-            decrRefCount(current);
-        }
+        decrRefCount(current);
     } else {
         value = 0;
     }
 
     value += incr;
-    new = createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",value));
-    hashReplace(o,c->argv[2],new);
+    new = createStringObjectFromLongLong(value);
+    hashTryObjectEncoding(o,&c->argv[2],NULL);
+    hashSet(o,c->argv[2],new);
     decrRefCount(new);
     addReplyLongLong(c,value);
     server.dirty++;
@@ -6321,6 +6491,7 @@ static void hgetCommand(redisClient *c) {
 
     if ((value = hashGet(o,c->argv[2])) != NULL) {
         addReplyBulk(c,value);
+        decrRefCount(value);
     } else {
         addReply(c,shared.nullbulk);
     }
@@ -6341,6 +6512,7 @@ static void hmgetCommand(redisClient *c) {
     for (i = 2; i < c->argc; i++) {
         if (o != NULL && (value = hashGet(o,c->argv[i])) != NULL) {
             addReplyBulk(c,value);
+            decrRefCount(value);
         } else {
             addReply(c,shared.nullbulk);
         }
@@ -6372,7 +6544,7 @@ static void hlenCommand(redisClient *c) {
 static void genericHgetallCommand(redisClient *c, int flags) {
     robj *o, *lenobj, *obj;
     unsigned long count = 0;
-    hashIterator hi;
+    hashIterator *hi;
 
     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.emptymultibulk)) == NULL
         || checkType(c,o,REDIS_HASH)) return;
@@ -6381,20 +6553,22 @@ static void genericHgetallCommand(redisClient *c, int flags) {
     addReply(c,lenobj);
     decrRefCount(lenobj);
 
-    hashInitIterator(o, &hi);
-    while (hashNext(&hi) != REDIS_ERR) {
+    hi = hashInitIterator(o);
+    while (hashNext(hi) != REDIS_ERR) {
         if (flags & REDIS_HASH_KEY) {
-            obj = hashCurrent(&hi,REDIS_HASH_KEY);
+            obj = hashCurrent(hi,REDIS_HASH_KEY);
             addReplyBulk(c,obj);
+            decrRefCount(obj);
             count++;
         }
         if (flags & REDIS_HASH_VALUE) {
-            obj = hashCurrent(&hi,REDIS_HASH_VALUE);
+            obj = hashCurrent(hi,REDIS_HASH_VALUE);
             addReplyBulk(c,obj);
+            decrRefCount(obj);
             count++;
         }
     }
-    hashReleaseIterator(&hi);
+    hashReleaseIterator(hi);
 
     lenobj->ptr = sdscatprintf(sdsempty(),"*%lu\r\n",count);
 }
@@ -6468,23 +6642,26 @@ static 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' */
+ * substituting the first occurence of '*' in 'pattern' with 'subst'.
+ * The returned object will always have its refcount increased by 1
+ * when it is non-NULL. */
 static robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) {
-    char *p;
+    char *p, *f;
     sds spat, ssub;
-    robj keyobj;
-    int prefixlen, sublen, postfixlen;
+    robj keyobj, fieldobj, *o;
+    int prefixlen, sublen, postfixlen, fieldlen;
     /* Expoit the internal sds representation to create a sds string allocated on the stack in order to make this function faster */
     struct {
         long len;
         long free;
         char buf[REDIS_SORTKEY_MAX+1];
-    } keyname;
+    } keyname, fieldname;
 
     /* If the pattern is "#" return the substitution object itself in order
      * to implement the "SORT ... GET #" feature. */
     spat = pattern->ptr;
     if (spat[0] == '#' && spat[1] == '\0') {
+        incrRefCount(subst);
         return subst;
     }
 
@@ -6501,20 +6678,47 @@ static robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) {
         return NULL;
     }
 
+    /* Find out if we're dealing with a hash dereference. */
+    if ((f = strstr(p+1, "->")) != NULL) {
+        fieldlen = sdslen(spat)-(f-spat);
+        /* this also copies \0 character */
+        memcpy(fieldname.buf,f+2,fieldlen-1);
+        fieldname.len = fieldlen-2;
+    } else {
+        fieldlen = 0;
+    }
+
     prefixlen = p-spat;
     sublen = sdslen(ssub);
-    postfixlen = sdslen(spat)-(prefixlen+1);
+    postfixlen = sdslen(spat)-(prefixlen+1)-fieldlen;
     memcpy(keyname.buf,spat,prefixlen);
     memcpy(keyname.buf+prefixlen,ssub,sublen);
     memcpy(keyname.buf+prefixlen+sublen,p+1,postfixlen);
     keyname.buf[prefixlen+sublen+postfixlen] = '\0';
     keyname.len = prefixlen+sublen+postfixlen;
-
-    initStaticStringObject(keyobj,((char*)&keyname)+(sizeof(long)*2))
     decrRefCount(subst);
 
-    /* printf("lookup '%s' => %p\n", keyname.buf,de); */
-    return lookupKeyRead(db,&keyobj);
+    /* Lookup substituted key */
+    initStaticStringObject(keyobj,((char*)&keyname)+(sizeof(long)*2));
+    o = lookupKeyRead(db,&keyobj);
+    if (o == NULL) return NULL;
+
+    if (fieldlen > 0) {
+        if (o->type != REDIS_HASH || fieldname.len < 1) return NULL;
+
+        /* Retrieve value from hash by the field name. This operation
+         * already increases the refcount of the returned object. */
+        initStaticStringObject(fieldobj,((char*)&fieldname)+(sizeof(long)*2));
+        o = hashGet(o, &fieldobj);
+    } else {
+        if (o->type != REDIS_STRING) return NULL;
+
+        /* Every object that this function returns needs to have its refcount
+         * increased. sortCommand decreases it again. */
+        incrRefCount(o);
+    }
+
+    return o;
 }
 
 /* sortCompare() is used by qsort in sortCommand(). Given that qsort_r with
@@ -6549,14 +6753,8 @@ static int sortCompare(const void *s1, const void *s2) {
                 cmp = strcoll(so1->u.cmpobj->ptr,so2->u.cmpobj->ptr);
             }
         } else {
-            /* Compare elements directly */
-            robj *dec1, *dec2;
-
-            dec1 = getDecodedObject(so1->obj);
-            dec2 = getDecodedObject(so2->obj);
-            cmp = strcoll(dec1->ptr,dec2->ptr);
-            decrRefCount(dec1);
-            decrRefCount(dec2);
+            /* Compare elements directly. */
+            cmp = compareStringObjects(so1->obj,so2->obj);
         }
     }
     return server.sort_desc ? -cmp : cmp;
@@ -6639,7 +6837,7 @@ static void sortCommand(redisClient *c) {
     case REDIS_LIST: vectorlen = listLength((list*)sortval->ptr); break;
     case REDIS_SET: vectorlen =  dictSize((dict*)sortval->ptr); break;
     case REDIS_ZSET: vectorlen = dictSize(((zset*)sortval->ptr)->dict); break;
-    default: vectorlen = 0; redisAssert(0); /* Avoid GCC warning */
+    default: vectorlen = 0; redisPanic("Bad SORT type"); /* Avoid GCC warning */
     }
     vector = zmalloc(sizeof(redisSortObject)*vectorlen);
     j = 0;
@@ -6683,38 +6881,36 @@ static void sortCommand(redisClient *c) {
     /* Now it's time to load the right scores in the sorting vector */
     if (dontsort == 0) {
         for (j = 0; j < vectorlen; j++) {
+            robj *byval;
             if (sortby) {
-                robj *byval;
-
+                /* lookup value to sort by */
                 byval = lookupKeyByPattern(c->db,sortby,vector[j].obj);
-                if (!byval || byval->type != REDIS_STRING) continue;
-                if (alpha) {
-                    vector[j].u.cmpobj = getDecodedObject(byval);
-                } else {
-                    if (byval->encoding == REDIS_ENCODING_RAW) {
-                        vector[j].u.score = strtod(byval->ptr,NULL);
-                    } else {
-                        /* Don't need to decode the object if it's
-                         * integer-encoded (the only encoding supported) so
-                         * far. We can just cast it */
-                        if (byval->encoding == REDIS_ENCODING_INT) {
-                            vector[j].u.score = (long)byval->ptr;
-                        } else
-                            redisAssert(1 != 1);
-                    }
-                }
+                if (!byval) continue;
             } else {
-                if (!alpha) {
-                    if (vector[j].obj->encoding == REDIS_ENCODING_RAW)
-                        vector[j].u.score = strtod(vector[j].obj->ptr,NULL);
-                    else {
-                        if (vector[j].obj->encoding == REDIS_ENCODING_INT)
-                            vector[j].u.score = (long) vector[j].obj->ptr;
-                        else
-                            redisAssert(1 != 1);
-                    }
+                /* use object itself to sort by */
+                byval = vector[j].obj;
+            }
+
+            if (alpha) {
+                if (sortby) vector[j].u.cmpobj = getDecodedObject(byval);
+            } else {
+                if (byval->encoding == REDIS_ENCODING_RAW) {
+                    vector[j].u.score = strtod(byval->ptr,NULL);
+                } else if (byval->encoding == REDIS_ENCODING_INT) {
+                    /* Don't need to decode the object if it's
+                     * integer-encoded (the only encoding supported) so
+                     * far. We can just cast it */
+                    vector[j].u.score = (long)byval->ptr;
+                } else {
+                    redisAssert(1 != 1);
                 }
             }
+
+            /* when the object was retrieved using lookupKeyByPattern,
+             * its refcount needs to be decreased. */
+            if (sortby) {
+                decrRefCount(byval);
+            }
         }
     }
 
@@ -6756,10 +6952,11 @@ static void sortCommand(redisClient *c) {
                     vector[j].obj);
 
                 if (sop->type == REDIS_SORT_GET) {
-                    if (!val || val->type != REDIS_STRING) {
+                    if (!val) {
                         addReply(c,shared.nullbulk);
                     } else {
                         addReplyBulk(c,val);
+                        decrRefCount(val);
                     }
                 } else {
                     redisAssert(sop->type == REDIS_SORT_GET); /* always fails */
@@ -6786,11 +6983,14 @@ static void sortCommand(redisClient *c) {
                     vector[j].obj);
 
                 if (sop->type == REDIS_SORT_GET) {
-                    if (!val || val->type != REDIS_STRING) {
+                    if (!val) {
                         listAddNodeTail(listPtr,createStringObject("",0));
                     } else {
+                        /* We should do a incrRefCount on val because it is
+                         * added to the list, but also a decrRefCount because
+                         * it is returned by lookupKeyByPattern. This results
+                         * in doing nothing at all. */
                         listAddNodeTail(listPtr,val);
-                        incrRefCount(val);
                     }
                 } else {
                     redisAssert(sop->type == REDIS_SORT_GET); /* always fails */
@@ -6811,7 +7011,7 @@ static void sortCommand(redisClient *c) {
     decrRefCount(sortval);
     listRelease(operations);
     for (j = 0; j < vectorlen; j++) {
-        if (sortby && alpha && vector[j].u.cmpobj)
+        if (alpha && vector[j].u.cmpobj)
             decrRefCount(vector[j].u.cmpobj);
     }
     zfree(vector);
@@ -7038,7 +7238,7 @@ static void expireGenericCommand(redisClient *c, robj *key, robj *param, long of
     dictEntry *de;
     time_t seconds;
 
-    if (getLongFromObject(c, param, &seconds) != REDIS_OK) return;
+    if (getLongFromObjectOrReply(c, param, &seconds, NULL) != REDIS_OK) return;
 
     seconds -= offset;
 
@@ -7047,7 +7247,7 @@ static void expireGenericCommand(redisClient *c, robj *key, robj *param, long of
         addReply(c,shared.czero);
         return;
     }
-    if (seconds < 0) {
+    if (seconds <= 0) {
         if (deleteKey(c->db,key)) server.dirty++;
         addReply(c, shared.cone);
         return;
@@ -7140,6 +7340,20 @@ static void discardCommand(redisClient *c) {
     addReply(c,shared.ok);
 }
 
+/* Send a MULTI command to all the slaves and AOF file. Check the execCommand
+ * implememntation for more information. */
+static void execCommandReplicateMulti(redisClient *c) {
+    struct redisCommand *cmd;
+    robj *multistring = createStringObject("MULTI",5);
+
+    cmd = lookupCommand("multi");
+    if (server.appendonly)
+        feedAppendOnlyFile(cmd,c->db->id,&multistring,1);
+    if (listLength(server.slaves))
+        replicationFeedSlaves(server.slaves,c->db->id,&multistring,1);
+    decrRefCount(multistring);
+}
+
 static void execCommand(redisClient *c) {
     int j;
     robj **orig_argv;
@@ -7150,6 +7364,13 @@ static void execCommand(redisClient *c) {
         return;
     }
 
+    /* Replicate a MULTI request now that we are sure the block is executed.
+     * This way we'll deliver the MULTI/..../EXEC block as a whole and
+     * both the AOF and the replication link will have the same consistency
+     * and atomicity guarantees. */
+    execCommandReplicateMulti(c);
+
+    /* Exec all the queued commands */
     orig_argv = c->argv;
     orig_argc = c->argc;
     addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",c->mstate.count));
@@ -7163,6 +7384,10 @@ static void execCommand(redisClient *c) {
     freeClientMultiState(c);
     initClientMultiState(c);
     c->flags &= (~REDIS_MULTI);
+    /* Make sure the EXEC command is always replicated / AOF, since we
+     * always send the MULTI command (we can't know beforehand if the
+     * next operations will contain at least a modification to the DB). */
+    server.dirty++;
 }
 
 /* =========================== Blocking Operations  ========================= */
@@ -8186,7 +8411,7 @@ static int rewriteAppendOnlyFile(char *filename) {
                     dictReleaseIterator(di);
                 }
             } else {
-                redisAssert(0);
+                redisPanic("Unknown object type");
             }
             /* Save the expire time */
             if (expiretime != -1) {
@@ -9673,8 +9898,9 @@ static int pubsubPublishMessage(robj *channel, robj *message) {
                                 sdslen(pat->pattern->ptr),
                                 (char*)channel->ptr,
                                 sdslen(channel->ptr),0)) {
-                addReply(pat->client,shared.mbulk3);
-                addReply(pat->client,shared.messagebulk);
+                addReply(pat->client,shared.mbulk4);
+                addReply(pat->client,shared.pmessagebulk);
+                addReplyBulk(pat->client,pat->pattern);
                 addReplyBulk(pat->client,channel);
                 addReplyBulk(pat->client,message);
                 receivers++;
@@ -9833,6 +10059,15 @@ static void _redisAssert(char *estr, char *file, int line) {
 #endif
 }
 
+static void _redisPanic(char *msg, char *file, int line) {
+    redisLog(REDIS_WARNING,"!!! Software Failure. Press left mouse button to continue");
+    redisLog(REDIS_WARNING,"Guru Meditation: %s #%s:%d",msg,file,line);
+#ifdef HAVE_BACKTRACE
+    redisLog(REDIS_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
+    *((char*)-1) = 'x';
+#endif
+}
+
 /* =================================== Main! ================================ */
 
 #ifdef __linux__
@@ -9852,7 +10087,7 @@ int linuxOvercommitMemoryValue(void) {
 
 void linuxOvercommitMemoryWarning(void) {
     if (linuxOvercommitMemoryValue() == 0) {
-        redisLog(REDIS_WARNING,"WARNING overcommit_memory is set to 0! Background save may fail under low condition memory. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.");
+        redisLog(REDIS_WARNING,"WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.");
     }
 }
 #endif /* __linux__ */