match_empty_counter plugin: Match for zero counter values.

[collectd.git] / src / match_empty_counter.c

diff --git a/src/match_empty_counter.c b/src/match_empty_counter.c
new file mode 100644 (file)
index 0000000..b9afd81
--- /dev/null
+++ b/src/match_empty_counter.c
@@ -0,0 +1,118 @@
+/**
+ * collectd - src/match_empty_counter.c
+ * Copyright (C) 2009  Florian Forster
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; only version 2 of the License is applicable.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ *
+ * Authors:
+ *   Florian Forster <octo at verplant.org>
+ **/
+
+#include "collectd.h"
+#include "common.h"
+#include "utils_cache.h"
+#include "filter_chain.h"
+
+/*
+ * private data types
+ */
+struct mec_match_s;
+typedef struct mec_match_s mec_match_t;
+struct mec_match_s
+{
+  int dummy;
+};
+
+/*
+ * internal helper functions
+ */
+static int mec_create (const oconfig_item_t *ci, void **user_data) /* {{{ */
+{
+  mec_match_t *m;
+
+  m = (mec_match_t *) malloc (sizeof (*m));
+  if (m == NULL)
+  {
+    ERROR ("mec_create: malloc failed.");
+    return (-ENOMEM);
+  }
+  memset (m, 0, sizeof (*m));
+
+  if (ci->children_num != 0)
+  {
+    ERROR ("empty_counter match: This match does not take any additional "
+        "configuration.");
+  }
+
+  *user_data = m;
+  return (0);
+} /* }}} int mec_create */
+
+static int mec_destroy (void **user_data) /* {{{ */
+{
+  if (user_data != NULL)
+  {
+    sfree (*user_data);
+  }
+
+  return (0);
+} /* }}} int mec_destroy */
+
+static int mec_match (const data_set_t __attribute__((unused)) *ds, /* {{{ */
+    const value_list_t *vl,
+    notification_meta_t __attribute__((unused)) **meta, void **user_data)
+{
+  mec_match_t *m;
+  int num_counters;
+  int num_empty;
+  int i;
+
+  if ((user_data == NULL) || (*user_data == NULL))
+    return (-1);
+
+  m = *user_data;
+
+  num_counters = 0;
+  num_empty = 0;
+
+  for (i = 0; i < ds->ds_num; i++)
+  {
+    if (ds->ds[i].type != DS_TYPE_COUNTER)
+      continue;
+
+    num_counters++;
+    if (vl->values[i].counter == 0)
+      num_empty++;
+  }
+
+  if (num_counters == 0)
+    return (FC_MATCH_NO_MATCH);
+  else if (num_counters == num_empty)
+    return (FC_MATCH_MATCHES);
+  else
+    return (FC_MATCH_NO_MATCH);
+} /* }}} int mec_match */
+
+void module_register (void)
+{
+  match_proc_t mproc;
+
+  memset (&mproc, 0, sizeof (mproc));
+  mproc.create  = mec_create;
+  mproc.destroy = mec_destroy;
+  mproc.match   = mec_match;
+  fc_register_match ("empty_counter", mproc);
+} /* module_register */
+
+/* vim: set sw=2 sts=2 tw=78 et fdm=marker : */