From a23f5e30270016b7d0eefc340c96081f3e9dd029 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@collectd.org>
Date: Sat, 10 Nov 2012 10:08:35 +0100
Subject: [PATCH] rrdcached plugin: Implement the "XFF" option.

---
 src/collectd.conf.pod |  8 ++++++++
 src/rrdcached.c       | 25 +++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/src/collectd.conf.pod b/src/collectd.conf.pod
index 9a670681..d7aba7bc 100644
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@ -4233,6 +4233,12 @@ more then one RRA. If this option is never used, the built-in default of (3600,
 
 For more information on how RRA-sizes are calculated see B<RRARows> above.
 
+=item B<XFF> I<Factor>
+
+Set the "XFiles Factor". The default is 0.1. If unsure, don't set this option.
+I<Factor> must be in the range C<[0.0-1.0)>, i.e. between zero (inclusive) and
+one (exclusive).
+
 =back
 
 =head2 Plugin C<rrdtool>
@@ -4290,6 +4296,8 @@ For more information on how RRA-sizes are calculated see B<RRARows> above.
 =item B<XFF> I<Factor>
 
 Set the "XFiles Factor". The default is 0.1. If unsure, don't set this option.
+I<Factor> must be in the range C<[0.0-1.0)>, i.e. between zero (inclusive) and
+one (exclusive).
 
 =item B<CacheFlush> I<Seconds>
 
diff --git a/src/rrdcached.c b/src/rrdcached.c
index 3731d010..8dd636c2 100644
--- a/src/rrdcached.c
+++ b/src/rrdcached.c
@@ -176,6 +176,29 @@ static int rc_config_get_int_positive (oconfig_item_t const *ci, int *ret)
   return (0);
 } /* int rc_config_get_int_positive */
 
+static int rc_config_get_xff (oconfig_item_t const *ci, double *ret)
+{
+  double value;
+
+  if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
+  {
+    ERROR ("rrdcached plugin: The \"%s\" needs exactly one numeric argument "
+        "in the range [0.0, 1.0)", ci->key);
+    return (EINVAL);
+  }
+
+  value = ci->values[0].value.number;
+  if ((value => 0.0) && (value < 1.0))
+  {
+    *ret = value;
+    return (0);
+  }
+
+  ERROR ("rrdcached plugin: The \"%s\" needs exactly one numeric argument "
+      "in the range [0.0, 1.0)", ci->key);
+  return (EINVAL);
+} /* int rc_config_get_xff */
+
 static int rc_config_add_timespan (int timespan)
 {
   int *tmp;
@@ -242,6 +265,8 @@ static int rc_config (oconfig_item_t *ci)
       if (status == 0)
         status = rc_config_add_timespan (tmp);
     }
+    else if (strcasecmp ("XFF", key) == 0)
+      status = rc_config_get_xff (child, &rrdcreate_config.xff);
     else
     {
       WARNING ("rrdcached plugin: Ignoring invalid option %s.", key);
-- 
2.30.2