From 0b4e3665a016d40a1fbf47a8542cb6a022096e1c Mon Sep 17 00:00:00 2001
From: Richard Wall <richard@the-moon.net>
Date: Fri, 14 Jun 2013 16:37:54 +0100
Subject: hack things around to allow independent ds transformers, even when
 they are in the same RRD file

---
 docs/examples/jarmon_example_recipes.js |  4 +--
 jarmon/jarmon.js                        | 43 +++++++++++++++++----------------
 2 files changed, 24 insertions(+), 23 deletions(-)

diff --git a/docs/examples/jarmon_example_recipes.js b/docs/examples/jarmon_example_recipes.js
index 7acfa8d..524515b 100644
--- a/docs/examples/jarmon_example_recipes.js
+++ b/docs/examples/jarmon_example_recipes.js
@@ -54,8 +54,8 @@ jarmon.CHART_RECIPES_COLLECTD = {
     'interface': {
         title: 'Wlan0 Throughput',
         data: [
-            ['data/interface/if_octets-wlan0.rrd', 'tx', 'Transmit', 'bit/s', function (v) { return v*8; }],
-            ['data/interface/if_octets-wlan0.rrd', 'rx', 'Receive', 'bit/s', function (v) { return v*8; }]
+            ['data/interface-wlan0/if_octets.rrd', 'tx', 'Transmit', 'bit/s', function (v) { return -v*8; }],
+            ['data/interface-wlan0/if_octets.rrd', 'rx', 'Receive', 'bit/s', function (v) { return v*8; }]
         ],
         options: jQuery.extend(true, {}, jarmon.Chart.BASE_OPTIONS)
     },
diff --git a/jarmon/jarmon.js b/jarmon/jarmon.js
index e4fd1dc..51b1c33 100644
--- a/jarmon/jarmon.js
+++ b/jarmon/jarmon.js
@@ -337,21 +337,14 @@ jarmon.localTimeFormatter = function (v, axis) {
  * @constructor
  * @param rrd {Object} A javascriptrrd.RRDFile
  * @param unit {String} The unit symbol for this data series
- * @param transformer {Function} A callable which performs a
- *      tranfsformation of the values returned from the RRD file.
  **/
-jarmon.RrdQuery = function(rrd, unit, transformer) {
+jarmon.RrdQuery = function(rrd, unit) {
     this.rrd = rrd;
     this.unit = unit;
-    if(typeof(transformer) !== 'undefined') {
- 	    this.transformer = transformer;
- 	} else {
- 	    this.transformer = function(v) {return v;};
- 	}
 };
 
 jarmon.RrdQuery.prototype.getData = function(startTimeJs, endTimeJs,
-                                             dsId, cfName) {
+                                             dsId, cfName, transformer) {
     /**
      * Generate a Flot compatible data object containing rows between start and
      * end time. The rows are taken from the first RRA whose data spans the
@@ -363,6 +356,8 @@ jarmon.RrdQuery.prototype.getData = function(startTimeJs, endTimeJs,
      * @param dsId {Variant} identifier of the RRD datasource (string or number)
      * @param cfName {String} The name of an RRD consolidation function (CF)
      *      eg AVERAGE, MIN, MAX
+     * @param transformer {Function} A callable which performs a
+     *      tranfsformation of the values returned from the RRD file.
      * @return {Object} A Flot compatible data series
      *      eg label: '', data: [], unit: ''
      **/
@@ -392,6 +387,10 @@ jarmon.RrdQuery.prototype.getData = function(startTimeJs, endTimeJs,
         cfName = 'AVERAGE';
     }
 
+    if(typeof(transformer) === 'undefined') {
+        transformer = function(v) {return v;};
+    }
+
     var rra, step, rraRowCount, lastRowTime, firstRowTime;
 
     for(var i=0; i<this.rrd.getNrRRAs(); i++) {
@@ -450,7 +449,7 @@ jarmon.RrdQuery.prototype.getData = function(startTimeJs, endTimeJs,
     var val;
     var timestamp = startRowTime;
     for(i=startRowIndex; i<endRowIndex; i++) {
-        val = this.transformer(rra.getEl(i, dsIndex));
+        val = transformer(rra.getEl(i, dsIndex));
         flotData.push([timestamp*1000.0, val]);
         timestamp += step;
     }
@@ -487,10 +486,8 @@ jarmon.RrdQuery.prototype.getDSNames = function() {
  * @param unit {String} The unit suffix of this data eg 'bit/sec'
  * @param downloader {Function} A callable which returns a Deferred and calls
  *      back with a javascriptrrd.BinaryFile when it has downloaded.
- * @param transformer {Function} A callable which performs a
- *      tranfsformation of the values returned from the RRD file.
  **/
-jarmon.RrdQueryRemote = function(url, unit, downloader, transformer) {
+jarmon.RrdQueryRemote = function(url, unit, downloader) {
     this.url = url;
     this.unit = unit;
     if(typeof(downloader) == 'undefined') {
@@ -498,7 +495,6 @@ jarmon.RrdQueryRemote = function(url, unit, downloader, transformer) {
     } else {
         this.downloader = downloader;
     }
-    this.transformer = transformer;
 
     this.lastUpdate = 0;
     this._download = null;
@@ -529,7 +525,7 @@ jarmon.RrdQueryRemote.prototype._callRemote = function(methodName, args) {
                 var rrd = new RRDFile(res);
                 self.lastUpdate = rrd.getLastUpdate();
 
-                var rq = new jarmon.RrdQuery(rrd, self.unit, self.transformer);
+                var rq = new jarmon.RrdQuery(rrd, self.unit);
                 try {
                     ret.resolve(rq[methodName].apply(rq, args));
                 } catch(e) {
@@ -544,7 +540,7 @@ jarmon.RrdQueryRemote.prototype._callRemote = function(methodName, args) {
 
 
 jarmon.RrdQueryRemote.prototype.getData = function(startTime, endTime,
-                                                   dsId, cfName) {
+                                                   dsId, cfName, transformer) {
     /**
      * Return a Flot compatible data series asynchronously.
      *
@@ -552,12 +548,16 @@ jarmon.RrdQueryRemote.prototype.getData = function(startTime, endTime,
      * @param startTime {Number} The start timestamp
      * @param endTime {Number} The end timestamp
      * @param dsId {Variant} identifier of the RRD datasource (string or number)
+     * @param cfName {String} The name of an RRD consolidation function (CF)
+     *      eg AVERAGE, MIN, MAX
+     * @param transformer {Function} A callable which performs a
+     *      tranfsformation of the values returned from the RRD file.
      * @return {Object} A Deferred which calls back with a flot data series.
      **/
     if(this.lastUpdate < endTime/1000) {
         this._download = null;
     }
-    return this._callRemote('getData', [startTime, endTime, dsId, cfName]);
+    return this._callRemote('getData', [startTime, endTime, dsId, cfName, transformer]);
 };
 
 
@@ -581,10 +581,11 @@ jarmon.RrdQueryRemote.prototype.getDSNames = function() {
  * @param rrdQuery {Object} An RrdQueryRemote instance
  * @param dsId {Variant} identifier of the RRD datasource (string or number)
  **/
-jarmon.RrdQueryDsProxy = function(rrdQuery, dsId) {
+jarmon.RrdQueryDsProxy = function(rrdQuery, dsId, transformer) {
     this.rrdQuery = rrdQuery;
     this.dsId = dsId;
     this.unit = rrdQuery.unit;
+    this.transformer = transformer;
 };
 
 jarmon.RrdQueryDsProxy.prototype.getData = function(startTime, endTime) {
@@ -596,7 +597,7 @@ jarmon.RrdQueryDsProxy.prototype.getData = function(startTime, endTime) {
      * @param endTime {Number} A unix timestamp marking the start time
      * @return {Object} A Deferred which calls back with a flot data series.
      **/
-    return this.rrdQuery.getData(startTime, endTime, this.dsId);
+    return this.rrdQuery.getData(startTime, endTime, this.dsId, undefined, this.transformer);
 };
 
 
@@ -712,9 +713,9 @@ jarmon.Chart.prototype.setup = function() {
 
         if(typeof(dataDict[rrd]) === 'undefined') {
             dataDict[rrd] = new jarmon.RrdQueryRemote(
-                rrd, unit, this.downloader, transformer);
+                rrd, unit, this.downloader);
         }
-        this.addData(label, new jarmon.RrdQueryDsProxy(dataDict[rrd], ds));
+        this.addData(label, new jarmon.RrdQueryDsProxy(dataDict[rrd], ds, transformer));
     }
 };
 
-- 
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