src/utils_match.[ch]: Implement match_value_reset().

This is called from the curl and memcachec plugins. Previously, gauge
average, minimum and maximum values were calculated since the start of
the daemon, rather than per-interval. This is not the documented
functionality.

Fixes: #663

diff --git a/src/curl.c b/src/curl.c
index e2c4a13..0d4677f 100644 (file)
--- a/src/curl.c
+++ b/src/curl.c
@@ -650,6 +650,7 @@ static int cc_read_page (web_page_t *wp) /* {{{ */
     }
 
     cc_submit (wp, wm, mv);
+    match_value_reset (mv);
   } /* for (wm = wp->matches; wm != NULL; wm = wm->next) */
 
   return (0);

diff --git a/src/memcachec.c b/src/memcachec.c
index c57a831..7c8528d 100644 (file)
--- a/src/memcachec.c
+++ b/src/memcachec.c
@@ -500,6 +500,7 @@ static int cmc_read_page (web_page_t *wp) /* {{{ */
     }
 
     cmc_submit (wp, wm, mv);
+    match_value_reset (mv);
   } /* for (wm = wp->matches; wm != NULL; wm = wm->next) */
 
   sfree (wp->buffer);

diff --git a/src/utils_match.c b/src/utils_match.c
index 062bcfe..bb53a9a 100644 (file)
--- a/src/utils_match.c
+++ b/src/utils_match.c
@@ -1,6 +1,6 @@
 /**
  * collectd - src/utils_match.c
- * Copyright (C) 2008  Florian octo Forster
+ * Copyright (C) 2008-2014  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
@@ -279,6 +279,18 @@ cu_match_t *match_create_simple (const char *regex,
   return (obj);
 } /* cu_match_t *match_create_simple */
 
+void match_value_reset (cu_match_value_t *mv)
+{
+  if (mv == NULL)
+    return;
+
+  if (mv->ds_type & UTILS_MATCH_DS_TYPE_GAUGE)
+  {
+    mv->value.gauge = NAN;
+    mv->values_num = 0;
+  }
+} /* }}} void match_value_reset */
+
 void match_destroy (cu_match_t *obj)
 {
   if (obj == NULL)

diff --git a/src/utils_match.h b/src/utils_match.h
index 36abe30..24517b3 100644 (file)
--- a/src/utils_match.h
+++ b/src/utils_match.h
@@ -1,6 +1,6 @@
 /**
  * collectd - src/utils_match.h
- * Copyright (C) 2008  Florian octo Forster
+ * Copyright (C) 2008-2014  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
@@ -119,6 +119,17 @@ cu_match_t *match_create_simple (const char *regex,
 
 /*
  * NAME
+ *  match_value_reset
+ *
+ * DESCRIPTION
+ *   Resets the internal state, if applicable. This function must be called
+ *   after each iteration for "simple" matches, usually after dispatching the
+ *   metrics.
+ */
+void match_value_reset (cu_match_value_t *mv);
+
+/*
+ * NAME
  *  match_destroy
  *
  * DESCRIPTION