rrdtool plugin: Add a config option to configure the RRA-timespans at runtime.

diff --git a/src/collectd.conf.pod b/src/collectd.conf.pod
index 07a49cc..da50a34 100644 (file)
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@ -506,6 +506,14 @@ one CDP by calculating:
 Bottom line is, set this no smaller than the width of you graphs in pixels. The
 default is 1200.
 
+=item B<RRATimespan> I<Seconds>
+
+Adds an RRA-timespan, given in seconds. Use this option mulitple times to have
+more then one RRA. If this option is never used, the built-in default of (3600,
+86400, 604800, 2678400, 31622400) is used.
+
+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.

diff --git a/src/rrdtool.c b/src/rrdtool.c
index b221341..814b3e3 100644 (file)
--- a/src/rrdtool.c
+++ b/src/rrdtool.c
@@ -52,6 +52,9 @@ static int rra_timespans[] =
 };
 static int rra_timespans_num = STATIC_ARRAY_SIZE (rra_timespans);
 
+static int *rra_timespans_custom = NULL;
+static int rra_timespans_custom_num = 0;
+
 static char *rra_types[] =
 {
        "AVERAGE",
@@ -68,6 +71,7 @@ static const char *config_keys[] =
        "StepSize",
        "HeartBeat",
        "RRARows",
+       "RRATimespan",
        "XFF"
 };
 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
@@ -92,7 +96,10 @@ static int rra_get (char ***ret)
        static char **rra_def = NULL;
        static int rra_num = 0;
 
-       int rra_max = rra_timespans_num * rra_types_num;
+       int *rts;
+       int  rts_num;
+
+       int rra_max;
 
        int span;
 
@@ -108,6 +115,20 @@ static int rra_get (char ***ret)
                return (rra_num);
        }
 
+       /* Use the configured timespans or fall back to the built-in defaults */
+       if (rra_timespans_custom_num != 0)
+       {
+               rts = rra_timespans_custom;
+               rts_num = rra_timespans_custom_num;
+       }
+       else
+       {
+               rts = rra_timespans;
+               rts_num = rra_timespans_num;
+       }
+
+       rra_max = rts_num * rra_types_num;
+
        if ((rra_def = (char **) malloc ((rra_max + 1) * sizeof (char *))) == NULL)
                return (-1);
        memset (rra_def, '\0', (rra_max + 1) * sizeof (char *));
@@ -119,9 +140,9 @@ static int rra_get (char ***ret)
        }
 
        cdp_len = 0;
-       for (i = 0; i < rra_timespans_num; i++)
+       for (i = 0; i < rts_num; i++)
        {
-               span = rra_timespans[i];
+               span = rts[i];
 
                if ((span / stepsize) < rrarows)
                        continue;
@@ -746,6 +767,32 @@ static int rrd_config (const char *key, const char *value)
                }
                rrarows = tmp;
        }
+       else if (strcasecmp ("RRATimespan", key) == 0)
+       {
+               char *saveptr = NULL;
+               char *dummy;
+               char *ptr;
+               int *tmp_alloc;
+
+               dummy = value;
+               while ((ptr = strtok_r (dummy, ", \t", &saveptr)) != NULL)
+               {
+                       dummy = NULL;
+                       
+                       tmp_alloc = realloc (rra_timespans_custom,
+                                       sizeof (int) * (rra_timespans_custom_num + 1));
+                       if (tmp_alloc == NULL)
+                       {
+                               fprintf (stderr, "rrdtool: realloc failed.\n");
+                               return (1);
+                       }
+                       rra_timespans_custom = tmp_alloc;
+                       rra_timespans_custom[rra_timespans_custom_num] = atoi (ptr);
+                       if (rra_timespans_custom[rra_timespans_custom_num] != 0)
+                               rra_timespans_custom_num++;
+               } /* while (strtok_r) */
+
+       }
        else if (strcasecmp ("XFF", key) == 0)
        {
                double tmp = atof (value);