fix sumSeries() function, closes #286

src/datasource-zabbix/specs/timeseries_specs.js

@@ -0,0 +1,34 @@
+// import _ from 'lodash';
+import ts from '../timeseries';
+
+describe('timeseries processing functions', () => {
+
+  describe('sumSeries()', () => {
+    it('should properly sum series', (done) => {
+      let series = [
+        [[0, 1], [1, 2], [1, 3]],
+        [[2, 1], [3, 2], [4, 3]]
+      ];
+
+      let expected = [[2, 1], [4, 2], [5, 3]];
+
+      let result = ts.sumSeries(series);
+      expect(result).to.eql(expected);
+      done();
+    });
+
+    it('should properly sum series with nulls', (done) => {
+      // issue #286
+      let series = [
+        [[1, 1], [1, 2], [1, 3]],
+        [[3, 2], [4, 3]]
+      ];
+
+      let expected = [[1, 1], [4, 2], [5, 3]];
+
+      let result = ts.sumSeries(series);
+      expect(result).to.eql(expected);
+      done();
+    });
+  });
+});

src/datasource-zabbix/timeseries.js

@@ -141,6 +141,7 @@ function sumSeries(timeseries) {
   new_timestamps = _.sortBy(new_timestamps);
 
   var interpolated_timeseries = _.map(timeseries, function (series) {
+    series = fillZeroes(series, new_timestamps);
     var timestamps = _.map(series, function (point) {
       return point[1];
     });
@@ -384,6 +385,30 @@ function sortByTime(series) {
   });
 }
 
+/**
+ * Fill empty front and end of series by zeroes.
+ *
+ * |   ***   |    |   ***   |
+ * |___   ___| -> |***   ***|
+ * @param {*} series
+ * @param {*} timestamps
+ */
+function fillZeroes(series, timestamps) {
+  let prepend = [];
+  let append = [];
+  let new_point;
+  for (let i = 0; i < timestamps.length; i++) {
+    if (timestamps[i] < series[0][POINT_TIMESTAMP]) {
+      new_point = [0, timestamps[i]];
+      prepend.push(new_point);
+    } else if (timestamps[i] > series[series.length - 1][POINT_TIMESTAMP]) {
+      new_point = [0, timestamps[i]];
+      append.push(new_point);
+    }
+  }
+  return _.concat(_.concat(prepend, series), append);
+}
+
 /**
  * Interpolate series with gaps
  */
@@ -393,8 +418,8 @@ function interpolateSeries(series) {
   // Interpolate series
   for (var i = series.length - 1; i >= 0; i--) {
     if (!series[i][0]) {
-      left = findNearestLeft(series, series[i]);
-      right = findNearestRight(series, series[i]);
+      left = findNearestLeft(series, i);
+      right = findNearestRight(series, i);
       if (!left) {
         left = right;
       }
@@ -415,26 +440,22 @@ function linearInterpolation(timestamp, left, right) {
   }
 }
 
-function findNearestRight(series, point) {
-  var point_index = _.indexOf(series, point);
-  var nearestRight;
-  for (var i = point_index; i < series.length; i++) {
+function findNearestRight(series, pointIndex) {
+  for (var i = pointIndex; i < series.length; i++) {
     if (series[i][0] !== null) {
       return series[i];
     }
   }
-  return nearestRight;
+  return null;
 }
 
-function findNearestLeft(series, point) {
-  var point_index = _.indexOf(series, point);
-  var nearestLeft;
-  for (var i = point_index; i > 0; i--) {
+function findNearestLeft(series, pointIndex) {
+  for (var i = pointIndex; i > 0; i--) {
     if (series[i][0] !== null) {
       return series[i];
     }
   }
-  return nearestLeft;
+  return null;
 }
 
 ////////////