From cc6d0a87fde638e2ad8c44ec5c15d8193439e12d Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@collectd.org>
Date: Sat, 17 Mar 2012 11:18:57 +0100
Subject: [PATCH] ethstat plugin: Implement the "MappedOnly" option.

---
 src/collectd.conf.in  |  1 +
 src/collectd.conf.pod |  5 +++++
 src/ethstat.c         | 19 +++++++++++++++++++
 3 files changed, 25 insertions(+)

diff --git a/src/collectd.conf.in b/src/collectd.conf.in
index befb7aba..f3ef6759 100644
--- a/src/collectd.conf.in
+++ b/src/collectd.conf.in
@@ -340,6 +340,7 @@
 #	Interface "eth0"
 #	Map "rx_csum_offload_errors" "if_rx_errors" "checksum_offload"
 #	Map "multicast" "if_multicast"
+#	MappedOnly false
 #</Plugin>
 
 #<Plugin exec>
diff --git a/src/collectd.conf.pod b/src/collectd.conf.pod
index bd14d0e6..f89af084 100644
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@ -1300,6 +1300,11 @@ instance> set to I<Name>, the name of the metric as reported by the driver. If
 an appropriate B<Map> option exists, the given I<Type> and, optionally,
 I<TypeInstance> will be used.
 
+=item B<MappedOnly> B<true>|B<false>
+
+When set to B<true>, only metrics that can be mapped to to a I<type> will be
+collected, all other metrics will be ignored. Defaults to B<false>.
+
 =back
 
 =head2 Plugin C<exec>
diff --git a/src/ethstat.c b/src/ethstat.c
index 7507bd97..bc024771 100644
--- a/src/ethstat.c
+++ b/src/ethstat.c
@@ -1,6 +1,7 @@
 /**
  * collectd - src/ethstat.c
  * Copyright (C) 2011       Cyril Feraudet
+ * Copyright (C) 2012       Florian "octo" 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
@@ -18,6 +19,7 @@
  *
  * Authors:
  *   Cyril Feraudet <cyril at feraudet.com>
+ *   Florian "octo" Forster <octo@collectd.org>
  **/
 
 #include "collectd.h"
@@ -25,6 +27,7 @@
 #include "plugin.h"
 #include "configfile.h"
 #include "utils_avltree.h"
+#include "utils_complain.h"
 
 #if HAVE_SYS_IOCTL_H
 # include <sys/ioctl.h>
@@ -51,6 +54,8 @@ static size_t interfaces_num = 0;
 
 static c_avl_tree_t *value_map = NULL;
 
+static _Bool collect_mapped_only = 0;
+
 static int ethstat_add_interface (const oconfig_item_t *ci) /* {{{ */
 {
   char **tmp;
@@ -144,6 +149,8 @@ static int ethstat_config (oconfig_item_t *ci) /* {{{ */
       ethstat_add_interface (child);
     else if (strcasecmp ("Map", child->key) == 0)
       ethstat_add_map (child);
+    else if (strcasecmp ("MappedOnly", child->key) == 0)
+      (void) cf_util_get_boolean (child, &collect_mapped_only);
     else
       WARNING ("ethstat plugin: The config option \"%s\" is unknown.",
           child->key);
@@ -155,6 +162,8 @@ static int ethstat_config (oconfig_item_t *ci) /* {{{ */
 static void ethstat_submit_value (const char *device,
     const char *type_instance, derive_t value)
 {
+  static c_complain_t complain_no_map = C_COMPLAIN_INIT_STATIC;
+
   value_t values[1];
   value_list_t vl = VALUE_LIST_INIT;
   value_map_t *map = NULL;
@@ -162,6 +171,16 @@ static void ethstat_submit_value (const char *device,
   if (value_map != NULL)
     c_avl_get (value_map, type_instance, (void *) &map);
 
+  /* If the "MappedOnly" option is specified, ignore unmapped values. */
+  if (collect_mapped_only && (map == NULL))
+  {
+    if (value_map == NULL)
+      c_complain (LOG_WARNING, &complain_no_map,
+          "ethstat plugin: The \"MappedOnly\" option has been set to true, "
+          "but no mapping has been configured. All values will be ignored!");
+    return;
+  }
+
   values[0].derive = value;
   vl.values = values;
   vl.values_len = 1;
-- 
2.30.2