From 7b1cd2f1da2ba207599a6537e5cc6328f07a9d20 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@leeloo.lan.home.verplant.org>
Date: Sat, 23 Feb 2008 19:51:59 +0100
Subject: [PATCH] src/utils_match.[ch]: Improved the handling of gauge values.

They can not use the consolidation functions `AVERAGE', `MIN', `MAX' and `LAST'
just as you know them from RRDTool.
---
 src/utils_match.c | 57 ++++++++++++++++++++++++++++++++++++++---------
 src/utils_match.h | 16 +++++++++----
 2 files changed, 59 insertions(+), 14 deletions(-)

diff --git a/src/utils_match.c b/src/utils_match.c
index d4ac05a2..4485f273 100644
--- a/src/utils_match.c
+++ b/src/utils_match.c
@@ -46,7 +46,7 @@ static int default_callback (const char *str, void *user_data)
 {
   cu_match_value_t *data = (cu_match_value_t *) user_data;
 
-  if (data->ds_type == UTILS_MATCH_DS_TYPE_GAUGE)
+  if (data->ds_type & UTILS_MATCH_DS_TYPE_GAUGE)
   {
     gauge_t value;
     char *endptr = NULL;
@@ -55,29 +55,66 @@ static int default_callback (const char *str, void *user_data)
     if (str == endptr)
       return (-1);
 
-    data->value.gauge = value;
+    if ((data->values_num == 0)
+	|| (data->ds_type & UTILS_MATCH_CF_GAUGE_LAST))
+    {
+      data->value.gauge = value;
+    }
+    else if (data->ds_type & UTILS_MATCH_CF_GAUGE_AVERAGE)
+    {
+      double f = ((double) data->values_num)
+	/ ((double) (data->values_num + 1));
+      data->value.gauge = (data->value.gauge * f) + (value * (1.0 - f));
+    }
+    else if (data->ds_type & UTILS_MATCH_CF_GAUGE_MIN)
+    {
+      if (data->value.gauge > value)
+	data->value.gauge = value;
+    }
+    else if (data->ds_type & UTILS_MATCH_CF_GAUGE_MAX)
+    {
+      if (data->value.gauge < value)
+	data->value.gauge = value;
+    }
+    else
+    {
+      ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
+      return (-1);
+    }
+
+    data->values_num++;
   }
-  else if ((data->ds_type == UTILS_MATCH_DS_TYPE_COUNTER_SET)
-      || (data->ds_type == UTILS_MATCH_DS_TYPE_COUNTER_ADD))
+  else if (data->ds_type & UTILS_MATCH_DS_TYPE_COUNTER)
   {
     counter_t value;
     char *endptr = NULL;
 
+    if (data->ds_type & UTILS_MATCH_CF_COUNTER_INC)
+    {
+      data->value.counter++;
+      data->values_num++;
+      return (0);
+    }
+
     value = strtoll (str, &endptr, 0);
     if (str == endptr)
       return (-1);
 
-    if (data->ds_type == UTILS_MATCH_DS_TYPE_COUNTER_SET)
+    if (data->ds_type & UTILS_MATCH_CF_COUNTER_SET)
       data->value.counter = value;
-    else
+    else if (data->ds_type & UTILS_MATCH_CF_COUNTER_ADD)
       data->value.counter += value;
-  }
-  else if (data->ds_type == UTILS_MATCH_DS_TYPE_COUNTER_INC)
-  {
-    data->value.counter++;
+    else
+    {
+      ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
+      return (-1);
+    }
+
+    data->values_num++;
   }
   else
   {
+    ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
     return (-1);
   }
 
diff --git a/src/utils_match.h b/src/utils_match.h
index 5108e966..da9f1bcd 100644
--- a/src/utils_match.h
+++ b/src/utils_match.h
@@ -28,10 +28,17 @@
 /*
  * Defines
  */
-#define UTILS_MATCH_DS_TYPE_GAUGE       0
-#define UTILS_MATCH_DS_TYPE_COUNTER_SET 1
-#define UTILS_MATCH_DS_TYPE_COUNTER_ADD 2
-#define UTILS_MATCH_DS_TYPE_COUNTER_INC 3
+#define UTILS_MATCH_DS_TYPE_GAUGE   0x10
+#define UTILS_MATCH_DS_TYPE_COUNTER 0x20
+
+#define UTILS_MATCH_CF_GAUGE_AVERAGE 0x01
+#define UTILS_MATCH_CF_GAUGE_MIN     0x02
+#define UTILS_MATCH_CF_GAUGE_MAX     0x04
+#define UTILS_MATCH_CF_GAUGE_LAST    0x08
+
+#define UTILS_MATCH_CF_COUNTER_SET   0x01
+#define UTILS_MATCH_CF_COUNTER_ADD   0x02
+#define UTILS_MATCH_CF_COUNTER_INC   0x04
 
 /*
  * Data types
@@ -43,6 +50,7 @@ struct cu_match_value_s
 {
   int ds_type;
   value_t value;
+  unsigned int values_num;
 };
 typedef struct cu_match_value_s cu_match_value_t;
 
-- 
2.30.2