add test

pkg/tsdb/stackdriver/stackdriver_test.go

@@ -4,6 +4,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"math"
+	"strconv"
 	"testing"
 	"time"
 
@@ -341,6 +343,46 @@ func TestStackdriver(t *testing.T) {
 					})
 				})
 			})
+
+			Convey("when data from query is distribution", func() {
+				data, err := loadTestFile("./test-data/3-series-response-distribution.json")
+				So(err, ShouldBeNil)
+				So(len(data.TimeSeries), ShouldEqual, 1)
+
+				res := &tsdb.QueryResult{Meta: simplejson.New(), RefId: "A"}
+				query := &StackdriverQuery{AliasBy: "{{bucket}}"}
+				err = executor.parseResponse(res, data, query)
+				So(err, ShouldBeNil)
+
+				So(len(res.Series), ShouldEqual, 11)
+				for i := 0; i < 11; i++ {
+					if i == 0 {
+						So(res.Series[i].Name, ShouldEqual, "0")
+					} else {
+						So(res.Series[i].Name, ShouldEqual, strconv.FormatInt(int64(math.Pow(float64(2), float64(i-1))), 10))
+					}
+					So(len(res.Series[i].Points), ShouldEqual, 3)
+				}
+
+				Convey("timestamps should be in ascending order", func() {
+					So(res.Series[0].Points[0][1].Float64, ShouldEqual, 1536668940000)
+					So(res.Series[0].Points[1][1].Float64, ShouldEqual, 1536669000000)
+					So(res.Series[0].Points[2][1].Float64, ShouldEqual, 1536669060000)
+				})
+
+				Convey("value should be correct", func() {
+					So(res.Series[8].Points[0][0].Float64, ShouldEqual, 1)
+					So(res.Series[9].Points[0][0].Float64, ShouldEqual, 1)
+					So(res.Series[10].Points[0][0].Float64, ShouldEqual, 1)
+					So(res.Series[8].Points[1][0].Float64, ShouldEqual, 0)
+					So(res.Series[9].Points[1][0].Float64, ShouldEqual, 0)
+					So(res.Series[10].Points[1][0].Float64, ShouldEqual, 1)
+					So(res.Series[8].Points[2][0].Float64, ShouldEqual, 0)
+					So(res.Series[9].Points[2][0].Float64, ShouldEqual, 1)
+					So(res.Series[10].Points[2][0].Float64, ShouldEqual, 0)
+				})
+			})
+
 		})
 	})
 }

pkg/tsdb/stackdriver/test-data/3-series-response-distribution.json

+{
+  "timeSeries": [
+    {
+      "metric": {
+        "type": "loadbalancing.googleapis.com\/https\/backend_latencies"
+      },
+      "resource": {
+        "type": "https_lb_rule",
+        "labels": {
+          "project_id": "grafana-prod"
+        }
+      },
+      "metricKind": "DELTA",
+      "valueType": "DISTRIBUTION",
+      "points": [
+        {
+          "interval": {
+            "startTime": "2018-09-11T12:30:00Z",
+            "endTime": "2018-09-11T12:31:00Z"
+          },
+          "value": {
+            "distributionValue": {
+              "count": "1",
+              "bucketOptions": {
+                "exponentialBuckets": {
+                  "numFiniteBuckets": 10,
+                  "growthFactor": 2,
+                  "scale": 1
+                }
+              },
+              "bucketCounts": [
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "1",
+                "0"
+              ]
+            }
+          }
+        },
+        {
+          "interval": {
+            "startTime": "2018-09-11T12:29:00Z",
+            "endTime": "2018-09-11T12:30:00Z"
+          },
+          "value": {
+            "distributionValue": {
+              "count": "1",
+              "bucketOptions": {
+                "exponentialBuckets": {
+                  "numFiniteBuckets": 10,
+                  "growthFactor": 2,
+                  "scale": 1
+                }
+              },
+              "bucketCounts": [
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "1"
+              ]
+            }
+          }
+        },
+        {
+          "interval": {
+            "startTime": "2018-09-11T12:28:00Z",
+            "endTime": "2018-09-11T12:29:00Z"
+          },
+          "value": {
+            "distributionValue": {
+              "count": "3",
+              "bucketOptions": {
+                "exponentialBuckets": {
+                  "numFiniteBuckets": 10,
+                  "growthFactor": 2,
+                  "scale": 1
+                }
+              },
+              "bucketCounts": [
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "0",
+                "1",
+                "1",
+                "1"
+              ]
+            }
+          }
+        }
+      ]
+    }
+  ]
+}