added a /api/metrics/test query that returns random walk series

pkg/api/metrics.go

@@ -0,0 +1,36 @@
+package api
+
+import (
+	"github.com/torkelo/grafana-pro/pkg/api/dtos"
+	"github.com/torkelo/grafana-pro/pkg/middleware"
+	"math/rand"
+	"strconv"
+)
+
+func GetTestMetrics(c *middleware.Context) {
+	from := c.QueryInt64("from")
+	to := c.QueryInt64("to")
+	maxDataPoints := c.QueryInt64("maxDataPoints")
+	stepInSeconds := (to - from) / maxDataPoints
+
+	result := dtos.MetricQueryResultDto{}
+	result.Data = make([]dtos.MetricQueryResultDataDto, 1)
+
+	for seriesIndex := range result.Data {
+		points := make([][2]float64, maxDataPoints)
+		walker := rand.Float64() * 100
+		time := from
+
+		for i := range points {
+			points[i][0] = walker
+			points[i][1] = float64(time)
+			walker += rand.Float64() - 0.5
+			time += stepInSeconds
+		}
+
+		result.Data[seriesIndex].Target = "test-series-" + strconv.Itoa(seriesIndex)
+		result.Data[seriesIndex].DataPoints = points
+	}
+
+	c.JSON(200, &result)
+}