#include <signal.h>
+void SlotToKeyAdd(robj *key);
+void SlotToKeyDel(robj *key);
+
/*-----------------------------------------------------------------------------
* C-level DB API
*----------------------------------------------------------------------------*/
* the disk object. If it is in this state, we wait.
*/
-void lookupWaitBusyKey(redisDb *db, robj *key) {
- /* FIXME: wait just for this key, not everything */
- waitEmptyIOJobsQueue();
- processAllPendingIOJobs();
- redisAssert((cacheScheduleIOGetFlags(db,key) & REDIS_IO_SAVEINPROG) == 0);
-}
-
robj *lookupKey(redisDb *db, robj *key) {
dictEntry *de = dictFind(db->dict,key->ptr);
if (de) {
* a copy on write madness. */
if (server.bgsavechildpid == -1 && server.bgrewritechildpid == -1)
val->lru = server.lruclock;
-
- if (server.ds_enabled &&
- cacheScheduleIOGetFlags(db,key) & REDIS_IO_SAVEINPROG)
- {
- /* Need to wait for the key to get unbusy */
- redisLog(REDIS_DEBUG,"Lookup found a key in SAVEINPROG state. Waiting. (Key was in the cache)");
- lookupWaitBusyKey(db,key);
- }
server.stat_keyspace_hits++;
return val;
} else {
- time_t expire;
- robj *val;
-
- /* Key not found in the in memory hash table, but if disk store is
- * enabled we may have this key on disk. If so load it in memory
- * in a blocking way. */
- if (server.ds_enabled && cacheKeyMayExist(db,key)) {
- long flags = cacheScheduleIOGetFlags(db,key);
-
- /* They key is not in cache, but it has a SAVE op in queue?
- * The only possibility is that the key was deleted, since
- * dirty keys are not evicted. */
- if (flags & REDIS_IO_SAVE) {
- server.stat_keyspace_misses++;
- return NULL;
- }
-
- /* At this point we need to blocking load the key in memory.
- * The first thing we do is waiting here if the key is busy. */
- if (flags & REDIS_IO_SAVEINPROG) {
- redisLog(REDIS_DEBUG,"Lookup found a key in SAVEINPROG state. Waiting (while force loading).");
- lookupWaitBusyKey(db,key);
- }
-
- redisLog(REDIS_DEBUG,"Force loading key %s via lookup", key->ptr);
- val = dsGet(db,key,&expire);
- if (val) {
- int retval = dbAdd(db,key,val);
- redisAssert(retval == REDIS_OK);
- if (expire != -1) setExpire(db,key,expire);
- server.stat_keyspace_hits++;
- return val;
- } else {
- cacheSetKeyDoesNotExist(db,key);
- }
- }
server.stat_keyspace_misses++;
return NULL;
}
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);
- if (server.ds_enabled) cacheSetKeyMayExist(db,key);
- 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);
+
+ redisAssert(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);
+
+ redisAssert(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) {
- robj *oldval;
- int retval;
-
- if ((oldval = dictFetchValue(db->dict,key->ptr)) == NULL) {
- sds copy = sdsdup(key->ptr);
- dictAdd(db->dict, copy, val);
- retval = 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);
- retval = 0;
+ dbOverwrite(db,key,val);
}
- if (server.ds_enabled) cacheSetKeyMayExist(db,key);
- return retval;
+ incrRefCount(val);
+ removeExpire(db,key);
+ touchWatchedKey(db,key);
}
int dbExists(redisDb *db, robj *key) {
/* Delete a key, value, and associated expiration entry if any, from the DB */
int dbDelete(redisDb *db, robj *key) {
- /* If diskstore is enabled make sure to awake waiting clients for this key
- * as it is not really useful to wait for a key already deleted to be
- * loaded from disk. */
- if (server.ds_enabled) {
- handleClientsBlockedOnSwappedKey(db,key);
- cacheSetKeyDoesNotExist(db,key);
- }
-
/* 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.
removed += dictSize(server.db[j].dict);
dictEmpty(server.db[j].dict);
dictEmpty(server.db[j].expires);
- if (server.ds_enabled) dictEmpty(server.db[j].io_negcache);
}
return removed;
}
void signalModifiedKey(redisDb *db, robj *key) {
touchWatchedKey(db,key);
- if (server.ds_enabled)
- cacheScheduleIO(db,key,REDIS_IO_SAVE);
}
void signalFlushedDb(int dbid) {
signalFlushedDb(c->db->id);
dictEmpty(c->db->dict);
dictEmpty(c->db->expires);
- if (server.ds_enabled) dsFlushDb(c->db->id);
addReply(c,shared.ok);
}
kill(server.bgsavechildpid,SIGKILL);
rdbRemoveTempFile(server.bgsavechildpid);
}
- if (server.ds_enabled)
- dsFlushDb(-1);
- else
- rdbSave(server.dbfilename);
+ rdbSave(server.dbfilename);
server.dirty++;
}
int deleted = 0, j;
for (j = 1; j < c->argc; j++) {
- if (server.ds_enabled) {
- lookupKeyRead(c->db,c->argv[j]);
- /* FIXME: this can be optimized a lot, no real need to load
- * a possibly huge value. */
- }
if (dbDelete(c->db,c->argv[j])) {
signalModifiedKey(c->db,c->argv[j]);
server.dirty++;
deleted++;
- } else if (server.ds_enabled) {
- if (cacheKeyMayExist(c->db,c->argv[j]) &&
- dsExists(c->db,c->argv[j]))
- {
- cacheScheduleIO(c->db,c->argv[j],REDIS_IO_SAVE);
- deleted = 1;
- }
}
}
addReplyLongLong(c,deleted);
void selectCommand(redisClient *c) {
int id = atoi(c->argv[1]->ptr);
+ if (server.cluster_enabled && id != 0) {
+ addReplyError(c,"SELECT is not allowed in cluster mode");
+ return;
+ }
if (selectDb(c,id) == REDIS_ERR) {
addReplyError(c,"invalid DB index");
} else {
return;
incrRefCount(o);
- if (dbAdd(c->db,c->argv[2],o) == REDIS_ERR) {
+ if (lookupKeyWrite(c->db,c->argv[2]) != NULL) {
if (nx) {
decrRefCount(o);
addReply(c,shared.czero);
return;
}
- dbReplace(c->db,c->argv[2],o);
+ dbOverwrite(c->db,c->argv[2],o);
+ } else {
+ dbAdd(c->db,c->argv[2],o);
}
dbDelete(c->db,c->argv[1]);
signalModifiedKey(c->db,c->argv[1]);
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 */
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
* send us synthesized DEL operations for expired keys.
addReply(c,shared.czero);
return;
}
- if (seconds <= 0) {
- if (dbDelete(c->db,key)) server.dirty++;
- addReply(c, shared.cone);
+ /* 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 (seconds <= 0 && !server.loading && !server.masterhost) {
+ robj *aux;
+
+ redisAssert(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);
return;
} else {
time_t when = time(NULL)+seconds;
void ttlCommand(redisClient *c) {
time_t expire, ttl = -1;
- if (server.ds_enabled) lookupKeyRead(c->db,c->argv[1]);
expire = getExpire(c->db,c->argv[1]);
if (expire != -1) {
ttl = (expire-time(NULL));
keys = zmalloc(sizeof(int)*((last - cmd->firstkey)+1));
for (j = cmd->firstkey; j <= last; j += cmd->keystep) {
redisAssert(j < argc);
- keys[i] = j;
+ keys[i++] = j;
}
+ *numkeys = i;
return keys;
}
int *keys = zmalloc(sizeof(int));
*numkeys = 1;
keys[0] = 1;
- return NULL;
+ return keys;
} else {
return getKeysUsingCommandTable(cmd,argv,argc,numkeys);
}
*numkeys = 0;
return NULL;
}
- keys = zmalloc(num);
+ 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