rrd_tune HW Update

Allow to set the smoothing window (alpha, beta, gamma) to zero.

I'm using rrdtool 1.3.8 with abberant behavior detection from the Brutlag
method. I need to use a week seasonality and no smoothing for the SEASONAL
and DEVSEASONAL. So I use rrdtune in order to set the smoothing window to
0.0. This calls the set_hwarg(). But this method is also used to tune the
alpha, beta and gamma that can't be set to 0.0 So when I tune my smoothing
window size to 0.0, it returns -1 due to the if(window<=0.0) then do
nothing. I join here a small correction with a differnent method used to set
only the smoothing window size and allowing it to be zero.

-- sylvain.luiset  gmail.com

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@1875 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/src/rrd_tune.c b/program/src/rrd_tune.c
index 0df0476b5c7756dcc3a21de632fd8b0a95058fe7..fe2e4796cd5c0459ee1a15a7bb2bf6abf2bbfe9e 100644 (file)
--- a/program/src/rrd_tune.c
+++ b/program/src/rrd_tune.c
@@ -305,7 +305,7 @@ int rrd_tune(
             break;
         case 's':
             strcpy(rrd.stat_head->version, RRD_VERSION);    /* smoothing_window causes Version 4 */
-            if (set_hwarg
+            if (set_hwsmootharg
                 (&rrd, CF_SEASONAL, RRA_seasonal_smoothing_window, optarg)) {
                 rrd_free(&rrd);
                 return -1;
@@ -313,7 +313,7 @@ int rrd_tune(
             break;
         case 'S':
             strcpy(rrd.stat_head->version, RRD_VERSION);    /* smoothing_window causes Version 4 */
-            if (set_hwarg
+            if (set_hwsmootharg
                 (&rrd, CF_DEVSEASONAL, RRA_seasonal_smoothing_window,
                  optarg)) {
                 rrd_free(&rrd);
@@ -398,6 +398,41 @@ int set_hwarg(
     return 0;
 }
 
+int set_hwsmootharg(
+    rrd_t *rrd,
+    enum cf_en cf,
+    enum rra_par_en rra_par,
+    char *arg)
+{
+    double    param;
+    unsigned long i;
+    signed short rra_idx = -1;
+
+    /* read the value */
+    param = atof(arg);
+    /* in order to avoid smoothing of SEASONAL or DEVSEASONAL, we need to 
+     * the 0.0 value*/
+    if (param < 0.0 || param > 1.0) {
+        rrd_set_error("Holt-Winters parameter must be between 0 and 1");
+        return -1;
+    }
+    /* does the appropriate RRA exist?  */
+    for (i = 0; i < rrd->stat_head->rra_cnt; ++i) {
+        if (cf_conv(rrd->rra_def[i].cf_nam) == cf) {
+            rra_idx = i;
+            break;
+        }
+    }
+    if (rra_idx == -1) {
+        rrd_set_error("Holt-Winters RRA does not exist in this RRD");
+        return -1;
+    }
+
+    /* set the value */
+    rrd->rra_def[rra_idx].par[rra_par].u_val = param;
+    return 0;
+}
+
 int set_deltaarg(
     rrd_t *rrd,
     enum rra_par_en rra_par,