#include "redis.h"
#include <signal.h>
+#include <ctype.h>
+
+void SlotToKeyAdd(robj *key);
+void SlotToKeyDel(robj *key);
/*-----------------------------------------------------------------------------
* C-level DB API
*----------------------------------------------------------------------------*/
+/* Important notes on lookup and disk store.
+ *
+ * When disk store is enabled on lookup we can have different cases.
+ *
+ * a) The key is in memory:
+ * - If the key is not in IO_SAVEINPROG state we can access it.
+ * As if it's just IO_SAVE this means we have the key in the IO queue
+ * but can't be accessed by the IO thread (it requires to be
+ * translated into an IO Job by the cache cron function.)
+ * - If the key is in IO_SAVEINPROG we can't touch the key and have
+ * to blocking wait completion of operations.
+ * b) The key is not in memory:
+ * - If it's marked as non existing on disk as well (negative cache)
+ * we don't need to perform the disk access.
+ * - if the key MAY EXIST, but is not in memory, and it is marked as IO_SAVE
+ * then the key can only be a deleted one. As IO_SAVE keys are never
+ * evicted (dirty state), so the only possibility is that key was deleted.
+ * - if the key MAY EXIST we need to blocking load it.
+ * We check that the key is not in IO_SAVEINPROG state before accessing
+ * the disk object. If it is in this state, we wait.
+ */
+
robj *lookupKey(redisDb *db, robj *key) {
dictEntry *de = dictFind(db->dict,key->ptr);
if (de) {
- robj *val = dictGetEntryVal(de);
+ 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.bgsavechildpid == -1 && server.bgrewritechildpid == -1)
+ if (server.rdb_child_pid == -1 && server.aof_child_pid == -1)
val->lru = server.lruclock;
-
- if (server.ds_enabled && val->storage == REDIS_DS_SAVING) {
- /* FIXME: change this code to just wait for our object to
- * get out of the IO Job. */
- waitEmptyIOJobsQueue();
- processAllPendingIOJobs();
- redisAssert(val->storage != REDIS_DS_SAVING);
- }
- 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.
- *
- * FIXME: race condition here. If there was an already scheduled
- * async loading of this key, what may happen is that the old
- * key is loaded in memory if this gets deleted in the meantime. */
- if (server.ds_enabled && cacheKeyMayExist(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;
- }
- }
- server.stat_keyspace_misses++;
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);
- if (server.ds_enabled) {
- /* FIXME: remove entry from negative cache */
- }
- 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);
-/* If the key does not exist, this is just like dbAdd(). Otherwise
- * the value associated to the key is replaced with the new one.
+ redisAssertWithInfo(NULL,key,retval == REDIS_OK);
+ }
+
+/* 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.
*
- * On update (key already existed) 0 is returned. Otherwise 1. */
-int dbReplace(redisDb *db, robj *key, robj *val) {
- robj *oldval;
+ * 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 ((oldval = dictFetchValue(db->dict,key->ptr)) == NULL) {
- sds copy = sdsdup(key->ptr);
- dictAdd(db->dict, copy, val);
- return 1;
+/* 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.
+ *
+ * 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 {
- val->storage = oldval->storage;
- 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)) {
/* 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);
-
- /* Mark this key as non existing on disk as well */
- cacheSetKeyDoesNotExistRemember(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) {
+ return 1;
+ } else {
+ return 0;
+ }
}
-/* Empty the whole database */
+/* Empty the whole database.
+ * If diskstore is enabled this function will just flush the in-memory cache. */
long long emptyDb() {
int j;
long long removed = 0;
void signalModifiedKey(redisDb *db, robj *key) {
touchWatchedKey(db,key);
- if (server.ds_enabled)
- cacheScheduleForFlush(db,key);
}
void signalFlushedDb(int dbid) {
touchWatchedKeysOnFlush(dbid);
- if (server.ds_enabled)
- dsFlushDb(dbid);
}
/*-----------------------------------------------------------------------------
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++;
}
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]))
- {
- cacheScheduleForFlush(c->db,c->argv[j]);
- deleted = 1;
- }
}
}
addReplyLongLong(c,deleted);
di = dictGetIterator(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 (allkeys || stringmatchlen(pattern,plen,key,sdslen(key),0)) {
addReplyStatus(c,type);
}
-void saveCommand(redisClient *c) {
- if (server.bgsavechildpid != -1) {
- addReplyError(c,"Background save already in progress");
- 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) {
- addReplyError(c,"Background save already in progress");
+ 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) {
- addReplyStatus(c,"Background saving started");
- } else {
- addReply(c,shared.err);
- }
-}
-
-void shutdownCommand(redisClient *c) {
- if (prepareForShutdown() == REDIS_OK)
- exit(0);
+ 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]);
signalModifiedKey(c->db,c->argv[1]);
signalModifiedKey(c->db,c->argv[2]);
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);
+ redisAssertWithInfo(NULL,key,dictFind(db->dict,key->ptr) != NULL);
return dictDelete(db->expires,key->ptr) == DICT_OK;
}
-void 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 */
- de = dictFind(db->dict,key->ptr);
- redisAssert(de != NULL);
- dictReplace(db->expires,dictGetEntryKey(de),(void*)when);
+ 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.
void propagateExpire(redisDb *db, robj *key) {
robj *argv[2];
- argv[0] = createStringObject("DEL",3);
+ argv[0] = shared.del;
argv[1] = key;
- incrRefCount(key);
+ incrRefCount(argv[0]);
+ incrRefCount(argv[1]);
- if (server.appendonly)
+ 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);
}
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
return time(NULL) > 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++;
* Expires Commands
*----------------------------------------------------------------------------*/
-void expireGenericCommand(redisClient *c, robj *key, robj *param, long offset) {
+/* Given an string object return true if it contains exactly the "ms"
+ * or "MS" string. This is used in order to check if the last argument
+ * of EXPIRE, EXPIREAT or TTL is "ms" to switch into millisecond input/output */
+int stringObjectEqualsMs(robj *a) {
+ char *arg = a->ptr;
+ return tolower(arg[0]) == 'm' && tolower(arg[1]) == 's' && arg[2] == '\0';
+}
+
+void expireGenericCommand(redisClient *c, long long offset, int unit) {
dictEntry *de;
- long seconds;
+ robj *key = c->argv[1], *param = c->argv[2];
+ long long milliseconds;
- if (getLongFromObjectOrReply(c, param, &seconds, NULL) != REDIS_OK) return;
+ if (getLongLongFromObjectOrReply(c, param, &milliseconds, NULL) != REDIS_OK)
+ return;
- seconds -= offset;
+ if (unit == UNIT_SECONDS) milliseconds *= 1000;
+ milliseconds -= offset;
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++;
- 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 (milliseconds <= 0 && !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);
return;
} else {
- time_t when = time(NULL)+seconds;
+ long long when = mstime()+milliseconds;
setExpire(c->db,key,when);
addReply(c,shared.cone);
signalModifiedKey(c->db,key);
}
void expireCommand(redisClient *c) {
- expireGenericCommand(c,c->argv[1],c->argv[2],0);
+ expireGenericCommand(c,0,UNIT_SECONDS);
}
void expireatCommand(redisClient *c) {
- expireGenericCommand(c,c->argv[1],c->argv[2],time(NULL));
+ expireGenericCommand(c,mstime(),UNIT_SECONDS);
}
-void ttlCommand(redisClient *c) {
- time_t expire, ttl = -1;
+void pexpireCommand(redisClient *c) {
+ expireGenericCommand(c,0,UNIT_MILLISECONDS);
+}
+
+void pexpireatCommand(redisClient *c) {
+ expireGenericCommand(c,mstime(),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 = (expire-time(NULL));
+ ttl = expire-mstime();
if (ttl < 0) ttl = -1;
}
- addReplyLongLong(c,(long long)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) {
}
}
}
+
+/* -----------------------------------------------------------------------------
+ * 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;
+}
projects / redis.git / blobdiff