TTL API change: TTL returns -2 for non existing keys.

[redis.git] / src / db.c

diff --git a/src/db.c b/src/db.c
index 199fdba496a004f6a3bd6736cd6089ee6a7d7e85..a73d1fbf5e0dc75c5d38379f33ce6f7bffd2d642 100644 (file)
--- a/src/db.c
+++ b/src/db.c
@@ -1,3 +1,32 @@
+/*
+ * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *   * Neither the name of Redis nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
 #include "redis.h"
 
 #include <signal.h>
@@ -228,7 +257,11 @@ void existsCommand(redisClient *c) {
 }
 
 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");
@@ -261,7 +294,7 @@ void keysCommand(redisClient *c) {
     unsigned long numkeys = 0;
     void *replylen = addDeferredMultiBulkLength(c);
 
-    di = dictGetIterator(c->db->dict);
+    di = dictGetSafeIterator(c->db->dict);
     allkeys = (pattern[0] == '*' && pattern[1] == '\0');
     while((de = dictNext(di)) != NULL) {
         sds key = dictGetKey(de);
@@ -510,24 +543,23 @@ int expireIfNeeded(redisDb *db, robj *key) {
  * 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) {
@@ -540,7 +572,7 @@ void expireGenericCommand(redisClient *c, long long offset, int unit) {
      *
      * 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 <= mstime() && !server.loading && !server.masterhost) {
+    if (when <= mstime() && !server.loading && !server.masterhost) {
         robj *aux;
 
         redisAssertWithInfo(c,key,dbDelete(c->db,key));
@@ -554,7 +586,7 @@ void expireGenericCommand(redisClient *c, long long offset, int unit) {
         addReply(c, shared.cone);
         return;
     } else {
-        setExpire(c->db,key,milliseconds);
+        setExpire(c->db,key,when);
         addReply(c,shared.cone);
         signalModifiedKey(c->db,key);
         server.dirty++;
@@ -582,6 +614,13 @@ void ttlGenericCommand(redisClient *c, int output_ms) {
     long long expire, ttl = -1;
 
     expire = getExpire(c->db,c->argv[1]);
+    /* If the key does not exist at all, return -2 */
+    if (expire == -1 && lookupKeyRead(c->db,c->argv[1]) == NULL) {
+        addReplyLongLong(c,-2);
+        return;
+    }
+    /* The key exists. Return -1 if it has no expire, or the actual
+     * TTL value otherwise. */
     if (expire != -1) {
         ttl = expire-mstime();
         if (ttl < 0) ttl = -1;