statsd plugin: Free latency counter and AVL trees.

latency counters (used by TIMER metrics) and AVL trees (used by SET metrics)
were not freed when cleaning up unused metrics. This resulted in leaked memory.

Fixes: #997

diff --git a/src/statsd.c b/src/statsd.c
index 327b8db476e0b192d0bf12ee13268d6170cbd253..ebb7c1ebd43e003c22f6bffbba1d6f9166abfa8c 100644 (file)
--- a/src/statsd.c
+++ b/src/statsd.c
@@ -190,6 +190,36 @@ static int statsd_metric_add (char const *name, double delta, /* {{{ */
   return (0);
 } /* }}} int statsd_metric_add */
 
+static void statsd_metric_free (statsd_metric_t *metric) /* {{{ */
+{
+  if (metric == NULL)
+    return;
+
+  if (metric->latency != NULL)
+  {
+    latency_counter_destroy (metric->latency);
+    metric->latency = NULL;
+  }
+
+  if (metric->set != NULL)
+  {
+    void *key;
+    void *value;
+
+    while (c_avl_pick (metric->set, &key, &value) == 0)
+    {
+      sfree (key);
+      assert (value == NULL);
+    }
+
+    c_avl_destroy (metric->set);
+    metric->set = NULL;
+  }
+
+  sfree (name);
+  sfree (metric);
+} /* }}} void statsd_metric_free */
+
 static int statsd_parse_value (char const *str, value_t *ret_value) /* {{{ */
 {
   char *endptr = NULL;
@@ -877,7 +907,7 @@ static int statsd_read (void) /* {{{ */
     }
 
     sfree (name);
-    sfree (metric);
+    statsd_metric_free (metric);
   }
 
   pthread_mutex_unlock (&metrics_lock);