#include "redis.h"
#include <signal.h>
+#include <ctype.h>
+
+void SlotToKeyAdd(robj *key);
+void SlotToKeyDel(robj *key);
/*-----------------------------------------------------------------------------
* C-level DB API
robj *lookupKey(redisDb *db, robj *key) {
dictEntry *de = dictFind(db->dict,key->ptr);
if (de) {
- robj *val = dictGetEntryVal(de);
-
- if (server.vm_enabled) {
- if (val->storage == REDIS_VM_MEMORY ||
- val->storage == REDIS_VM_SWAPPING)
- {
- /* If we were swapping the object out, cancel the operation */
- if (val->storage == REDIS_VM_SWAPPING)
- vmCancelThreadedIOJob(val);
- /* Update the access time for the aging algorithm. */
- val->lru = server.lruclock;
- } else {
- int notify = (val->storage == REDIS_VM_LOADING);
-
- /* Our value was swapped on disk. Bring it at home. */
- redisAssert(val->type == REDIS_VMPOINTER);
- val = vmLoadObject(val);
- dictGetEntryVal(de) = val;
-
- /* Clients blocked by the VM subsystem may be waiting for
- * this key... */
- if (notify) handleClientsBlockedOnSwappedKey(db,key);
- }
- }
+ robj *val = dictGetVal(de);
+
+ /* Update the access time for the aging algorithm.
+ * Don't do it if we have a saving child, as this will trigger
+ * a copy on write madness. */
+ if (server.rdb_child_pid == -1 && server.aof_child_pid == -1)
+ val->lru = server.lruclock;
return val;
} else {
return NULL;
}
robj *lookupKeyRead(redisDb *db, robj *key) {
+ robj *val;
+
expireIfNeeded(db,key);
- return lookupKey(db,key);
+ val = lookupKey(db,key);
+ if (val == NULL)
+ server.stat_keyspace_misses++;
+ else
+ server.stat_keyspace_hits++;
+ return val;
}
robj *lookupKeyWrite(redisDb *db, robj *key) {
return o;
}
-/* Add the key to the DB. If the key already exists REDIS_ERR is returned,
- * otherwise REDIS_OK is returned, and the caller should increment the
- * refcount of 'val'. */
-int dbAdd(redisDb *db, robj *key, robj *val) {
- /* Perform a lookup before adding the key, as we need to copy the
- * key value. */
- if (dictFind(db->dict, key->ptr) != NULL) {
- return REDIS_ERR;
- } else {
- sds copy = sdsdup(key->ptr);
- dictAdd(db->dict, copy, val);
- return REDIS_OK;
- }
+/* Add the key to the DB. It's up to the caller to increment the reference
+ * counte of the value if needed.
+ *
+ * The program is aborted if the key already exists. */
+void dbAdd(redisDb *db, robj *key, robj *val) {
+ sds copy = sdsdup(key->ptr);
+ int retval = dictAdd(db->dict, copy, val);
+
+ redisAssertWithInfo(NULL,key,retval == REDIS_OK);
+ if (server.cluster_enabled) SlotToKeyAdd(key);
+ }
+
+/* Overwrite an existing key with a new value. Incrementing the reference
+ * count of the new value is up to the caller.
+ * This function does not modify the expire time of the existing key.
+ *
+ * The program is aborted if the key was not already present. */
+void dbOverwrite(redisDb *db, robj *key, robj *val) {
+ struct dictEntry *de = dictFind(db->dict,key->ptr);
+
+ redisAssertWithInfo(NULL,key,de != NULL);
+ dictReplace(db->dict, key->ptr, val);
}
-/* If the key does not exist, this is just like dbAdd(). Otherwise
- * the value associated to the key is replaced with the new one.
+/* High level Set operation. This function can be used in order to set
+ * a key, whatever it was existing or not, to a new object.
*
- * On update (key already existed) 0 is returned. Otherwise 1. */
-int dbReplace(redisDb *db, robj *key, robj *val) {
- if (dictFind(db->dict,key->ptr) == NULL) {
- sds copy = sdsdup(key->ptr);
- dictAdd(db->dict, copy, val);
- return 1;
+ * 1) The ref count of the value object is incremented.
+ * 2) clients WATCHing for the destination key notified.
+ * 3) The expire time of the key is reset (the key is made persistent). */
+void setKey(redisDb *db, robj *key, robj *val) {
+ if (lookupKeyWrite(db,key) == NULL) {
+ dbAdd(db,key,val);
} else {
- dictReplace(db->dict, key->ptr, val);
- return 0;
+ dbOverwrite(db,key,val);
}
+ incrRefCount(val);
+ removeExpire(db,key);
+ signalModifiedKey(db,key);
}
int dbExists(redisDb *db, robj *key) {
de = dictGetRandomKey(db->dict);
if (de == NULL) return NULL;
- key = dictGetEntryKey(de);
+ key = dictGetKey(de);
keyobj = createStringObject(key,sdslen(key));
if (dictFind(db->expires,key)) {
if (expireIfNeeded(db,keyobj)) {
/* Deleting an entry from the expires dict will not free the sds of
* the key, because it is shared with the main dictionary. */
if (dictSize(db->expires) > 0) dictDelete(db->expires,key->ptr);
- return dictDelete(db->dict,key->ptr) == DICT_OK;
+ if (dictDelete(db->dict,key->ptr) == DICT_OK) {
+ if (server.cluster_enabled) SlotToKeyDel(key);
+ return 1;
+ } else {
+ return 0;
+ }
}
-/* Empty the whole database */
long long emptyDb() {
int j;
long long removed = 0;
return REDIS_OK;
}
+/*-----------------------------------------------------------------------------
+ * Hooks for key space changes.
+ *
+ * Every time a key in the database is modified the function
+ * signalModifiedKey() is called.
+ *
+ * Every time a DB is flushed the function signalFlushDb() is called.
+ *----------------------------------------------------------------------------*/
+
+void signalModifiedKey(redisDb *db, robj *key) {
+ touchWatchedKey(db,key);
+}
+
+void signalFlushedDb(int dbid) {
+ touchWatchedKeysOnFlush(dbid);
+}
+
/*-----------------------------------------------------------------------------
* Type agnostic commands operating on the key space
*----------------------------------------------------------------------------*/
void flushdbCommand(redisClient *c) {
server.dirty += dictSize(c->db->dict);
- touchWatchedKeysOnFlush(c->db->id);
+ signalFlushedDb(c->db->id);
dictEmpty(c->db->dict);
dictEmpty(c->db->expires);
addReply(c,shared.ok);
}
void flushallCommand(redisClient *c) {
- touchWatchedKeysOnFlush(-1);
+ signalFlushedDb(-1);
server.dirty += emptyDb();
addReply(c,shared.ok);
- if (server.bgsavechildpid != -1) {
- kill(server.bgsavechildpid,SIGKILL);
- rdbRemoveTempFile(server.bgsavechildpid);
+ if (server.rdb_child_pid != -1) {
+ kill(server.rdb_child_pid,SIGKILL);
+ rdbRemoveTempFile(server.rdb_child_pid);
+ }
+ if (server.saveparamslen > 0) {
+ /* Normally rdbSave() will reset dirty, but we don't want this here
+ * as otherwise FLUSHALL will not be replicated nor put into the AOF. */
+ int saved_dirty = server.dirty;
+ rdbSave(server.rdb_filename);
+ server.dirty = saved_dirty;
}
- rdbSave(server.dbfilename);
server.dirty++;
}
for (j = 1; j < c->argc; j++) {
if (dbDelete(c->db,c->argv[j])) {
- touchWatchedKey(c->db,c->argv[j]);
+ signalModifiedKey(c->db,c->argv[j]);
server.dirty++;
deleted++;
}
}
void selectCommand(redisClient *c) {
- int id = atoi(c->argv[1]->ptr);
+ long id;
+
+ if (getLongFromObjectOrReply(c, c->argv[1], &id,
+ "invalid DB index") != REDIS_OK)
+ return;
+ if (server.cluster_enabled && id != 0) {
+ addReplyError(c,"SELECT is not allowed in cluster mode");
+ return;
+ }
if (selectDb(c,id) == REDIS_ERR) {
- addReplySds(c,sdsnew("-ERR invalid DB index\r\n"));
+ addReplyError(c,"invalid DB index");
} else {
addReply(c,shared.ok);
}
dictIterator *di;
dictEntry *de;
sds pattern = c->argv[1]->ptr;
- int plen = sdslen(pattern);
+ int plen = sdslen(pattern), allkeys;
unsigned long numkeys = 0;
- robj *lenobj = createObject(REDIS_STRING,NULL);
+ void *replylen = addDeferredMultiBulkLength(c);
- di = dictGetIterator(c->db->dict);
- addReply(c,lenobj);
- decrRefCount(lenobj);
+ di = dictGetSafeIterator(c->db->dict);
+ allkeys = (pattern[0] == '*' && pattern[1] == '\0');
while((de = dictNext(di)) != NULL) {
- sds key = dictGetEntryKey(de);
+ sds key = dictGetKey(de);
robj *keyobj;
- if ((pattern[0] == '*' && pattern[1] == '\0') ||
- stringmatchlen(pattern,plen,key,sdslen(key),0)) {
+ if (allkeys || stringmatchlen(pattern,plen,key,sdslen(key),0)) {
keyobj = createStringObject(key,sdslen(key));
if (expireIfNeeded(c->db,keyobj) == 0) {
addReplyBulk(c,keyobj);
}
}
dictReleaseIterator(di);
- lenobj->ptr = sdscatprintf(sdsempty(),"*%lu\r\n",numkeys);
+ setDeferredMultiBulkLength(c,replylen,numkeys);
}
void dbsizeCommand(redisClient *c) {
- addReplySds(c,
- sdscatprintf(sdsempty(),":%lu\r\n",dictSize(c->db->dict)));
+ addReplyLongLong(c,dictSize(c->db->dict));
}
void lastsaveCommand(redisClient *c) {
- addReplySds(c,
- sdscatprintf(sdsempty(),":%lu\r\n",server.lastsave));
+ addReplyLongLong(c,server.lastsave);
}
void typeCommand(redisClient *c) {
o = lookupKeyRead(c->db,c->argv[1]);
if (o == NULL) {
- type = "+none";
+ type = "none";
} else {
switch(o->type) {
- case REDIS_STRING: type = "+string"; break;
- case REDIS_LIST: type = "+list"; break;
- case REDIS_SET: type = "+set"; break;
- case REDIS_ZSET: type = "+zset"; break;
- case REDIS_HASH: type = "+hash"; break;
- default: type = "+unknown"; break;
+ case REDIS_STRING: type = "string"; break;
+ case REDIS_LIST: type = "list"; break;
+ case REDIS_SET: type = "set"; break;
+ case REDIS_ZSET: type = "zset"; break;
+ case REDIS_HASH: type = "hash"; break;
+ default: type = "unknown"; break;
}
}
- addReplySds(c,sdsnew(type));
- addReply(c,shared.crlf);
+ addReplyStatus(c,type);
}
-void saveCommand(redisClient *c) {
- if (server.bgsavechildpid != -1) {
- addReplySds(c,sdsnew("-ERR background save in progress\r\n"));
- return;
- }
- if (rdbSave(server.dbfilename) == REDIS_OK) {
- addReply(c,shared.ok);
- } else {
- addReply(c,shared.err);
- }
-}
+void shutdownCommand(redisClient *c) {
+ int flags = 0;
-void bgsaveCommand(redisClient *c) {
- if (server.bgsavechildpid != -1) {
- addReplySds(c,sdsnew("-ERR background save already in progress\r\n"));
+ if (c->argc > 2) {
+ addReply(c,shared.syntaxerr);
return;
+ } else if (c->argc == 2) {
+ if (!strcasecmp(c->argv[1]->ptr,"nosave")) {
+ flags |= REDIS_SHUTDOWN_NOSAVE;
+ } else if (!strcasecmp(c->argv[1]->ptr,"save")) {
+ flags |= REDIS_SHUTDOWN_SAVE;
+ } else {
+ addReply(c,shared.syntaxerr);
+ return;
+ }
}
- if (rdbSaveBackground(server.dbfilename) == REDIS_OK) {
- char *status = "+Background saving started\r\n";
- addReplySds(c,sdsnew(status));
- } else {
- addReply(c,shared.err);
- }
-}
-
-void shutdownCommand(redisClient *c) {
- if (prepareForShutdown() == REDIS_OK)
- exit(0);
- addReplySds(c, sdsnew("-ERR Errors trying to SHUTDOWN. Check logs.\r\n"));
+ if (prepareForShutdown(flags) == REDIS_OK) exit(0);
+ addReplyError(c,"Errors trying to SHUTDOWN. Check logs.");
}
void renameGenericCommand(redisClient *c, int nx) {
robj *o;
+ long long expire;
/* To use the same key as src and dst is probably an error */
if (sdscmp(c->argv[1]->ptr,c->argv[2]->ptr) == 0) {
return;
incrRefCount(o);
- if (dbAdd(c->db,c->argv[2],o) == REDIS_ERR) {
+ expire = getExpire(c->db,c->argv[1]);
+ if (lookupKeyWrite(c->db,c->argv[2]) != NULL) {
if (nx) {
decrRefCount(o);
addReply(c,shared.czero);
return;
}
- dbReplace(c->db,c->argv[2],o);
+ /* Overwrite: delete the old key before creating the new one with the same name. */
+ dbDelete(c->db,c->argv[2]);
}
+ dbAdd(c->db,c->argv[2],o);
+ if (expire != -1) setExpire(c->db,c->argv[2],expire);
dbDelete(c->db,c->argv[1]);
- touchWatchedKey(c->db,c->argv[1]);
- touchWatchedKey(c->db,c->argv[2]);
+ signalModifiedKey(c->db,c->argv[1]);
+ signalModifiedKey(c->db,c->argv[2]);
server.dirty++;
addReply(c,nx ? shared.cone : shared.ok);
}
redisDb *src, *dst;
int srcid;
+ if (server.cluster_enabled) {
+ addReplyError(c,"MOVE is not allowed in cluster mode");
+ return;
+ }
+
/* Obtain source and target DB pointers */
src = c->db;
srcid = c->db->id;
return;
}
- /* Try to add the element to the target DB */
- if (dbAdd(dst,c->argv[1],o) == REDIS_ERR) {
+ /* Return zero if the key already exists in the target DB */
+ if (lookupKeyWrite(dst,c->argv[1]) != NULL) {
addReply(c,shared.czero);
return;
}
+ dbAdd(dst,c->argv[1],o);
incrRefCount(o);
/* OK! key moved, free the entry in the source DB */
int removeExpire(redisDb *db, robj *key) {
/* An expire may only be removed if there is a corresponding entry in the
* main dict. Otherwise, the key will never be freed. */
- redisAssert(dictFind(db->dict,key->ptr) != NULL);
- if (dictDelete(db->expires,key->ptr) == DICT_OK) {
- return 1;
- } else {
- return 0;
- }
+ redisAssertWithInfo(NULL,key,dictFind(db->dict,key->ptr) != NULL);
+ return dictDelete(db->expires,key->ptr) == DICT_OK;
}
-int setExpire(redisDb *db, robj *key, time_t when) {
- dictEntry *de;
+void setExpire(redisDb *db, robj *key, long long when) {
+ dictEntry *kde, *de;
/* Reuse the sds from the main dict in the expire dict */
- redisAssert((de = dictFind(db->dict,key->ptr)) != NULL);
- if (dictAdd(db->expires,dictGetEntryKey(de),(void*)when) == DICT_ERR) {
- return 0;
- } else {
- return 1;
- }
+ kde = dictFind(db->dict,key->ptr);
+ redisAssertWithInfo(NULL,key,kde != NULL);
+ de = dictReplaceRaw(db->expires,dictGetKey(kde));
+ dictSetSignedIntegerVal(de,when);
}
/* Return the expire time of the specified key, or -1 if no expire
* is associated with this key (i.e. the key is non volatile) */
-time_t getExpire(redisDb *db, robj *key) {
+long long getExpire(redisDb *db, robj *key) {
dictEntry *de;
/* No expire? return ASAP */
/* The entry was found in the expire dict, this means it should also
* be present in the main dict (safety check). */
- redisAssert(dictFind(db->dict,key->ptr) != NULL);
- return (time_t) dictGetEntryVal(de);
+ redisAssertWithInfo(NULL,key,dictFind(db->dict,key->ptr) != NULL);
+ return dictGetSignedIntegerVal(de);
}
/* Propagate expires into slaves and the AOF file.
* will be consistent even if we allow write operations against expiring
* keys. */
void propagateExpire(redisDb *db, robj *key) {
- struct redisCommand *cmd;
robj *argv[2];
- cmd = lookupCommand("del");
- argv[0] = createStringObject("DEL",3);
+ argv[0] = shared.del;
argv[1] = key;
- incrRefCount(key);
+ incrRefCount(argv[0]);
+ incrRefCount(argv[1]);
- if (server.appendonly)
- feedAppendOnlyFile(cmd,db->id,argv,2);
+ if (server.aof_state != REDIS_AOF_OFF)
+ feedAppendOnlyFile(server.delCommand,db->id,argv,2);
if (listLength(server.slaves))
replicationFeedSlaves(server.slaves,db->id,argv,2);
- decrRefCount(key);
+ decrRefCount(argv[0]);
+ decrRefCount(argv[1]);
}
int expireIfNeeded(redisDb *db, robj *key) {
- time_t when = getExpire(db,key);
+ long long when = getExpire(db,key);
+
+ if (when < 0) return 0; /* No expire for this key */
+
+ /* Don't expire anything while loading. It will be done later. */
+ if (server.loading) return 0;
/* If we are running in the context of a slave, return ASAP:
* the slave key expiration is controlled by the master that will
* that is, 0 if we think the key should be still valid, 1 if
* we think the key is expired at this time. */
if (server.masterhost != NULL) {
- return time(NULL) > when;
+ return mstime() > when;
}
- if (when < 0) return 0;
-
/* Return when this key has not expired */
- if (time(NULL) <= when) return 0;
+ if (mstime() <= when) return 0;
/* Delete the key */
server.stat_expiredkeys++;
- server.dirty++;
propagateExpire(db,key);
return dbDelete(db,key);
}
* Expires Commands
*----------------------------------------------------------------------------*/
-void expireGenericCommand(redisClient *c, robj *key, robj *param, long offset) {
+/* This is the generic command implementation for EXPIRE, PEXPIRE, EXPIREAT
+ * and PEXPIREAT. Because the commad second argument may be relative or absolute
+ * the "basetime" argument is used to signal what the base time is (either 0
+ * for *AT variants of the command, or the current time for relative expires).
+ *
+ * unit is either UNIT_SECONDS or UNIT_MILLISECONDS, and is only used for
+ * the argv[2] parameter. The basetime is always specified in milliesconds. */
+void expireGenericCommand(redisClient *c, long long basetime, int unit) {
dictEntry *de;
- time_t seconds;
+ robj *key = c->argv[1], *param = c->argv[2];
+ long long when; /* unix time in milliseconds when the key will expire. */
- if (getLongFromObjectOrReply(c, param, &seconds, NULL) != REDIS_OK) return;
+ if (getLongLongFromObjectOrReply(c, param, &when, NULL) != REDIS_OK)
+ return;
- seconds -= offset;
+ if (unit == UNIT_SECONDS) when *= 1000;
+ when += basetime;
de = dictFind(c->db->dict,key->ptr);
if (de == NULL) {
addReply(c,shared.czero);
return;
}
- if (seconds <= 0) {
- if (dbDelete(c->db,key)) server.dirty++;
+ /* EXPIRE with negative TTL, or EXPIREAT with a timestamp into the past
+ * should never be executed as a DEL when load the AOF or in the context
+ * of a slave instance.
+ *
+ * Instead we take the other branch of the IF statement setting an expire
+ * (possibly in the past) and wait for an explicit DEL from the master. */
+ if (when <= mstime() && !server.loading && !server.masterhost) {
+ robj *aux;
+
+ redisAssertWithInfo(c,key,dbDelete(c->db,key));
+ server.dirty++;
+
+ /* Replicate/AOF this as an explicit DEL. */
+ aux = createStringObject("DEL",3);
+ rewriteClientCommandVector(c,2,aux,key);
+ decrRefCount(aux);
+ signalModifiedKey(c->db,key);
addReply(c, shared.cone);
- touchWatchedKey(c->db,key);
return;
} else {
- time_t when = time(NULL)+seconds;
- if (setExpire(c->db,key,when)) {
- addReply(c,shared.cone);
- touchWatchedKey(c->db,key);
- server.dirty++;
- } else {
- addReply(c,shared.czero);
- }
+ setExpire(c->db,key,when);
+ addReply(c,shared.cone);
+ signalModifiedKey(c->db,key);
+ server.dirty++;
return;
}
}
void expireCommand(redisClient *c) {
- expireGenericCommand(c,c->argv[1],c->argv[2],0);
+ expireGenericCommand(c,mstime(),UNIT_SECONDS);
}
void expireatCommand(redisClient *c) {
- expireGenericCommand(c,c->argv[1],c->argv[2],time(NULL));
+ expireGenericCommand(c,0,UNIT_SECONDS);
}
-void ttlCommand(redisClient *c) {
- time_t expire;
- int ttl = -1;
+void pexpireCommand(redisClient *c) {
+ expireGenericCommand(c,mstime(),UNIT_MILLISECONDS);
+}
+
+void pexpireatCommand(redisClient *c) {
+ expireGenericCommand(c,0,UNIT_MILLISECONDS);
+}
+
+void ttlGenericCommand(redisClient *c, int output_ms) {
+ long long expire, ttl = -1;
expire = getExpire(c->db,c->argv[1]);
if (expire != -1) {
- ttl = (int) (expire-time(NULL));
+ ttl = expire-mstime();
if (ttl < 0) ttl = -1;
}
- addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",ttl));
+ if (ttl == -1) {
+ addReplyLongLong(c,-1);
+ } else {
+ addReplyLongLong(c,output_ms ? ttl : ((ttl+500)/1000));
+ }
+}
+
+void ttlCommand(redisClient *c) {
+ ttlGenericCommand(c, 0);
+}
+
+void pttlCommand(redisClient *c) {
+ ttlGenericCommand(c, 1);
+}
+
+void persistCommand(redisClient *c) {
+ dictEntry *de;
+
+ de = dictFind(c->db->dict,c->argv[1]->ptr);
+ if (de == NULL) {
+ addReply(c,shared.czero);
+ } else {
+ if (removeExpire(c->db,c->argv[1])) {
+ addReply(c,shared.cone);
+ server.dirty++;
+ } else {
+ addReply(c,shared.czero);
+ }
+ }
+}
+
+/* -----------------------------------------------------------------------------
+ * API to get key arguments from commands
+ * ---------------------------------------------------------------------------*/
+
+int *getKeysUsingCommandTable(struct redisCommand *cmd,robj **argv, int argc, int *numkeys) {
+ int j, i = 0, last, *keys;
+ REDIS_NOTUSED(argv);
+
+ if (cmd->firstkey == 0) {
+ *numkeys = 0;
+ return NULL;
+ }
+ last = cmd->lastkey;
+ if (last < 0) last = argc+last;
+ keys = zmalloc(sizeof(int)*((last - cmd->firstkey)+1));
+ for (j = cmd->firstkey; j <= last; j += cmd->keystep) {
+ redisAssert(j < argc);
+ keys[i++] = j;
+ }
+ *numkeys = i;
+ return keys;
+}
+
+int *getKeysFromCommand(struct redisCommand *cmd,robj **argv, int argc, int *numkeys, int flags) {
+ if (cmd->getkeys_proc) {
+ return cmd->getkeys_proc(cmd,argv,argc,numkeys,flags);
+ } else {
+ return getKeysUsingCommandTable(cmd,argv,argc,numkeys);
+ }
+}
+
+void getKeysFreeResult(int *result) {
+ zfree(result);
+}
+
+int *noPreloadGetKeys(struct redisCommand *cmd,robj **argv, int argc, int *numkeys, int flags) {
+ if (flags & REDIS_GETKEYS_PRELOAD) {
+ *numkeys = 0;
+ return NULL;
+ } else {
+ return getKeysUsingCommandTable(cmd,argv,argc,numkeys);
+ }
+}
+
+int *renameGetKeys(struct redisCommand *cmd,robj **argv, int argc, int *numkeys, int flags) {
+ if (flags & REDIS_GETKEYS_PRELOAD) {
+ int *keys = zmalloc(sizeof(int));
+ *numkeys = 1;
+ keys[0] = 1;
+ return keys;
+ } else {
+ return getKeysUsingCommandTable(cmd,argv,argc,numkeys);
+ }
+}
+
+int *zunionInterGetKeys(struct redisCommand *cmd,robj **argv, int argc, int *numkeys, int flags) {
+ int i, num, *keys;
+ REDIS_NOTUSED(cmd);
+ REDIS_NOTUSED(flags);
+
+ num = atoi(argv[2]->ptr);
+ /* Sanity check. Don't return any key if the command is going to
+ * reply with syntax error. */
+ if (num > (argc-3)) {
+ *numkeys = 0;
+ return NULL;
+ }
+ keys = zmalloc(sizeof(int)*num);
+ for (i = 0; i < num; i++) keys[i] = 3+i;
+ *numkeys = num;
+ return keys;
+}
+
+/* Slot to Key API. This is used by Redis Cluster in order to obtain in
+ * a fast way a key that belongs to a specified hash slot. This is useful
+ * while rehashing the cluster. */
+void SlotToKeyAdd(robj *key) {
+ unsigned int hashslot = keyHashSlot(key->ptr,sdslen(key->ptr));
+
+ zslInsert(server.cluster.slots_to_keys,hashslot,key);
+ incrRefCount(key);
+}
+
+void SlotToKeyDel(robj *key) {
+ unsigned int hashslot = keyHashSlot(key->ptr,sdslen(key->ptr));
+
+ zslDelete(server.cluster.slots_to_keys,hashslot,key);
+}
+
+unsigned int GetKeysInSlot(unsigned int hashslot, robj **keys, unsigned int count) {
+ zskiplistNode *n;
+ zrangespec range;
+ int j = 0;
+
+ range.min = range.max = hashslot;
+ range.minex = range.maxex = 0;
+
+ n = zslFirstInRange(server.cluster.slots_to_keys, range);
+ while(n && n->score == hashslot && count--) {
+ keys[j++] = n->obj;
+ n = n->level[0].forward;
+ }
+ return j;
}
projects / redis.git / blobdiff