* 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) {
* a copy on write madness. */
if (server.rdb_child_pid == -1 && server.aof_child_pid == -1)
val->lru = server.lruclock;
- server.stat_keyspace_hits++;
return val;
} else {
- 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) {
}
incrRefCount(val);
removeExpire(db,key);
- touchWatchedKey(db,key);
+ signalModifiedKey(db,key);
}
int dbExists(redisDb *db, robj *key) {
}
}
-/* 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 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.aof_state != REDIS_AOF_OFF)
feedAppendOnlyFile(server.delCommand,db->id,argv,2);
* 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;
}
/* Return when this key has not expired */
* Expires Commands
*----------------------------------------------------------------------------*/
-/* 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) {
+/* 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;
robj *key = c->argv[1], *param = c->argv[2];
- long long milliseconds;
+ long long when; /* unix time in milliseconds when the key will expire. */
- if (getLongLongFromObjectOrReply(c, param, &milliseconds, NULL) != REDIS_OK)
+ if (getLongLongFromObjectOrReply(c, param, &when, NULL) != REDIS_OK)
return;
- if (unit == UNIT_SECONDS) milliseconds *= 1000;
- milliseconds -= offset;
+ if (unit == UNIT_SECONDS) when *= 1000;
+ when += basetime;
de = dictFind(c->db->dict,key->ptr);
if (de == NULL) {
*
* 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) {
+ if (when <= mstime() && !server.loading && !server.masterhost) {
robj *aux;
redisAssertWithInfo(c,key,dbDelete(c->db,key));
addReply(c, shared.cone);
return;
} else {
- long long when = mstime()+milliseconds;
setExpire(c->db,key,when);
addReply(c,shared.cone);
signalModifiedKey(c->db,key);
}
void expireCommand(redisClient *c) {
- expireGenericCommand(c,0,UNIT_SECONDS);
+ expireGenericCommand(c,mstime(),UNIT_SECONDS);
}
void expireatCommand(redisClient *c) {
- expireGenericCommand(c,mstime(),UNIT_SECONDS);
+ expireGenericCommand(c,0,UNIT_SECONDS);
}
void pexpireCommand(redisClient *c) {
- expireGenericCommand(c,0,UNIT_MILLISECONDS);
+ expireGenericCommand(c,mstime(),UNIT_MILLISECONDS);
}
void pexpireatCommand(redisClient *c) {
- expireGenericCommand(c,mstime(),UNIT_MILLISECONDS);
+ expireGenericCommand(c,0,UNIT_MILLISECONDS);
}
void ttlGenericCommand(redisClient *c, int output_ms) {
projects / redis.git / blobdiff