src/utils_cache.c: Update GETVAL output when missing state.

Hi

I think that I've found a bug when use unixsock plugin. The problem is
releate with missing state, when no value is received by daemon for a
while in the cache is marked as MISSING, but the last value is still
showing even when machine is not reporting in a GETVAL and LISTVAL
commands. Some utlities like collectd-nagios does not work correctly,
and report an OKAY value when host is not reporting from a long time.

I attach a patch with check the state value of an cache entry in
uc_get_names and in uc_get_rate_by_name. This patch works for me, but
it's not very tested yet, and I not very sure about if it's a good way
to check the problem. The patch is tested on 4.7.2 release version.

BTW a GETSTATE command will be an useful feature too :P

Regards,
  Andres

Signed-off-by: Florian Forster <octo@huhu.verplant.org>

diff --git a/src/utils_cache.c b/src/utils_cache.c
index 60d3283..4d2c554 100644 (file)
--- a/src/utils_cache.c
+++ b/src/utils_cache.c
@@ -497,16 +497,24 @@ int uc_get_rate_by_name (const char *name, gauge_t **ret_values, size_t *ret_val
   {
     assert (ce != NULL);
 
-    ret_num = ce->values_num;
-    ret = (gauge_t *) malloc (ret_num * sizeof (gauge_t));
-    if (ret == NULL)
+    /* remove missing values from getval */
+    if (ce->state == STATE_MISSING)
     {
-      ERROR ("utils_cache: uc_get_rate_by_name: malloc failed.");
       status = -1;
     }
     else
     {
-      memcpy (ret, ce->values_gauge, ret_num * sizeof (gauge_t));
+      ret_num = ce->values_num;
+      ret = (gauge_t *) malloc (ret_num * sizeof (gauge_t));
+      if (ret == NULL)
+      {
+        ERROR ("utils_cache: uc_get_rate_by_name: malloc failed.");
+        status = -1;
+      }
+      else
+      {
+        memcpy (ret, ce->values_gauge, ret_num * sizeof (gauge_t));
+      }
     }
   }
   else
@@ -579,6 +587,10 @@ int uc_get_names (char ***ret_names, time_t **ret_times, size_t *ret_number)
   {
     char **temp;
 
+    /* remove missing values when list values */
+    if (value->state == STATE_MISSING)
+      continue;
+
     if (ret_times != NULL)
     {
       time_t *tmp_times;