report card

_examples/request_timings/main.go

@@ -0,0 +1,113 @@
+package main
+
+import (
+	"net/http"
+	"strings"
+	"time"
+
+	util "github.com/blendlabs/go-util"
+	"github.com/wcharczuk/go-chart"
+)
+
+func readData() ([]time.Time, []float64) {
+	var xvalues []time.Time
+	var yvalues []float64
+	util.ReadFileByLines("requests.csv", func(line string) {
+		parts := strings.Split(line, ",")
+		year := util.ParseInt(parts[0])
+		month := util.ParseInt(parts[1])
+		day := util.ParseInt(parts[2])
+		hour := util.ParseInt(parts[3])
+		elapsedMillis := util.ParseFloat64(parts[4])
+		xvalues = append(xvalues, time.Date(year, time.Month(month), day, hour, 0, 0, 0, time.UTC))
+		yvalues = append(yvalues, elapsedMillis)
+	})
+	return xvalues, yvalues
+}
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+	xvalues, yvalues := readData()
+	mainSeries := chart.TimeSeries{
+		Name: "Prod Request Timings",
+		Style: chart.Style{
+			Show:        true,
+			StrokeColor: chart.ColorBlue,
+			FillColor:   chart.ColorBlue.WithAlpha(100),
+		},
+		XValues: xvalues,
+		YValues: yvalues,
+	}
+
+	minSeries := &chart.MinSeries{
+		Style: chart.Style{
+			Show:            true,
+			StrokeColor:     chart.ColorAlternateGray,
+			StrokeDashArray: []float64{5.0, 5.0},
+		},
+		InnerSeries: mainSeries,
+	}
+
+	maxSeries := &chart.MaxSeries{
+		Style: chart.Style{
+			Show:            true,
+			StrokeColor:     chart.ColorAlternateGray,
+			StrokeDashArray: []float64{5.0, 5.0},
+		},
+		InnerSeries: mainSeries,
+	}
+
+	linreg := &chart.LinearRegressionSeries{
+		Name: "Linear Regression",
+		Style: chart.Style{
+			Show:            true,
+			StrokeColor:     chart.ColorAlternateBlue,
+			StrokeDashArray: []float64{5.0, 5.0},
+		},
+		InnerSeries: mainSeries,
+	}
+
+	sma := &chart.SMASeries{
+		Name: "SMA",
+		Style: chart.Style{
+			Show:            true,
+			StrokeColor:     chart.ColorRed,
+			StrokeDashArray: []float64{5.0, 5.0},
+		},
+		InnerSeries: mainSeries,
+	}
+
+	graph := chart.Chart{
+		Width:  1280,
+		Height: 720,
+		YAxis: chart.YAxis{
+			Name:      "Elapsed Millis",
+			NameStyle: chart.StyleShow(),
+			Style:     chart.StyleShow(),
+		},
+		XAxis: chart.XAxis{
+			Style:          chart.StyleShow(),
+			ValueFormatter: chart.TimeHourValueFormatter,
+		},
+		Series: []chart.Series{
+			mainSeries,
+			minSeries,
+			maxSeries,
+			chart.LastValueAnnotation(minSeries),
+			chart.LastValueAnnotation(maxSeries),
+			linreg,
+			chart.LastValueAnnotation(linreg),
+			sma,
+			chart.LastValueAnnotation(sma),
+		},
+	}
+
+	graph.Elements = []chart.Renderable{chart.Legend(&graph)}
+
+	res.Header().Set("Content-Type", "image/png")
+	graph.Render(chart.PNG, res)
+}
+
+func main() {
+	http.HandleFunc("/", drawChart)
+	http.ListenAndServe(":8080", nil)
+}