refreshing the cache time of a key

[Oleksandr V. Typlyns'kyi]

Today Feb 27, 2008 at 09:51 Dustin Sallings wrote:

> 
> On Feb 27, 2008, at 4:17, bharath venkatesh wrote:
> 
> >   is it possible to refresh the cache time of a key with out having to
> > retrieving the cached data and storing it back in memcache .. for example if
> > a data is cached for
> > 1 hour and  at the 50th minute from the time this data has been  cached i
> > want to   store it in the cache for  1  more  hour  ..is there a  function
> > to  refresh the cache time by knowing the key of data with out having to do
> > get and set
> 
> 
> 	There's been talk of a ``touch'' command, but no work has been done on implementing such a thing.

Maybe it can be simple based on incr/decr?

diff -rU 1 memcached.orig memcached.c
--- memcached.orig      2007-12-02 07:50:14.000000000 +0200
+++ memcached.c 2008-02-27 23:07:40.000000000 +0200
@@ -1507,2 +1507,50 @@

+static void process_touch_command(conn *c, token_t *tokens, const size_t ntokens) {
+    item *it;
+    char *key;
+    size_t nkey;
+    time_t exptime;
+
+    assert(c != NULL);
+
+    if(tokens[KEY_TOKEN].length > KEY_MAX_LENGTH) {
+        out_string(c, "CLIENT_ERROR bad command line format");
+       return;
+    }
+
+    key = tokens[KEY_TOKEN].value;
+    nkey = tokens[KEY_TOKEN].length;
+
+    if (settings.managed) {
+        int bucket = c->bucket;
+        if (bucket == -1) {
+            out_string(c, "CLIENT_ERROR no BG data in managed mode");
+            return;
+        }
+        c->bucket = -1;
+        if (buckets[bucket] != c->gen) {
+            out_string(c, "ERROR_NOT_OWNER");
+            return;
+        }
+    }
+
+    exptime = strtol(tokens[2].value, NULL, 10);
+
+    if(errno == ERANGE) {
+        out_string(c, "CLIENT_ERROR bad command line format");
+       return;
+    }
+
+    it = item_get(key, nkey);
+
+    if (it) {
+         it->exptime=realtime(exptime);
+        do_item_update(it);
+        out_string(c, "STORED");
+        item_remove(it); /* release our reference */
+    } else {
+       out_string(c, "NOT_FOUND");
+    }
+}
+
 static void process_delete_command(conn *c, token_t *tokens, const size_t ntokens) {
@@ -1661,2 +1709,6 @@

+    } else if (ntokens == 4 && (strcmp(tokens[COMMAND_TOKEN].value, "touch") == 0)) {
+
+        process_touch_command(c, tokens, ntokens);
+
     } else if (ntokens >= 3 && ntokens <= 4 && (strcmp(tokens[COMMAND_TOKEN].value, "delete") == 0)) {

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