124 lines
3 KiB
Go
124 lines
3 KiB
Go
package main
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import (
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/wcharczuk/go-chart"
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)
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func parseInt(str string) int {
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v, _ := strconv.Atoi(str)
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return v
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}
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func parseFloat64(str string) float64 {
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v, _ := strconv.ParseFloat(str, 64)
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return v
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}
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func readData() ([]time.Time, []float64) {
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var xvalues []time.Time
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var yvalues []float64
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chart.File.ReadByLines("requests.csv", func(line string) {
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parts := strings.Split(line, ",")
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year := parseInt(parts[0])
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month := parseInt(parts[1])
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day := parseInt(parts[2])
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hour := parseInt(parts[3])
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elapsedMillis := parseFloat64(parts[4])
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xvalues = append(xvalues, time.Date(year, time.Month(month), day, hour, 0, 0, 0, time.UTC))
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yvalues = append(yvalues, elapsedMillis)
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})
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return xvalues, yvalues
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}
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func releases() []chart.GridLine {
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return []chart.GridLine{
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{Value: chart.Time.ToFloat64(time.Date(2016, 8, 1, 9, 30, 0, 0, time.UTC))},
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{Value: chart.Time.ToFloat64(time.Date(2016, 8, 2, 9, 30, 0, 0, time.UTC))},
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{Value: chart.Time.ToFloat64(time.Date(2016, 8, 3, 9, 30, 0, 0, time.UTC))},
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{Value: chart.Time.ToFloat64(time.Date(2016, 8, 4, 9, 30, 0, 0, time.UTC))},
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{Value: chart.Time.ToFloat64(time.Date(2016, 8, 5, 9, 30, 0, 0, time.UTC))},
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{Value: chart.Time.ToFloat64(time.Date(2016, 8, 6, 9, 30, 0, 0, time.UTC))},
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}
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}
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func drawChart(res http.ResponseWriter, req *http.Request) {
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xvalues, yvalues := readData()
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mainSeries := chart.TimeSeries{
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Name: "Prod Request Timings",
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Style: chart.Style{
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Show: true,
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StrokeColor: chart.ColorBlue,
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FillColor: chart.ColorBlue.WithAlpha(100),
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},
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XValues: xvalues,
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YValues: yvalues,
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}
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linreg := &chart.LinearRegressionSeries{
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Name: "Linear Regression",
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Style: chart.Style{
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Show: true,
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StrokeColor: chart.ColorAlternateBlue,
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StrokeDashArray: []float64{5.0, 5.0},
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},
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InnerSeries: mainSeries,
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}
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sma := &chart.SMASeries{
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Name: "SMA",
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Style: chart.Style{
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Show: true,
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StrokeColor: chart.ColorRed,
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StrokeDashArray: []float64{5.0, 5.0},
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},
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InnerSeries: mainSeries,
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}
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graph := chart.Chart{
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Width: 1280,
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Height: 720,
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YAxis: chart.YAxis{
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Name: "Elapsed Millis",
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NameStyle: chart.StyleShow(),
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Style: chart.StyleShow(),
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},
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XAxis: chart.XAxis{
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Style: chart.Style{
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Show: true,
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},
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ValueFormatter: chart.TimeHourValueFormatter,
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GridMajorStyle: chart.Style{
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Show: true,
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StrokeColor: chart.ColorAlternateGray,
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StrokeWidth: 1.0,
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},
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TickPosition: chart.TickPositionBetweenTicks,
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TickStyle: chart.Style{
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TextRotationDegrees: 45,
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},
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GridLines: releases(),
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},
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Series: []chart.Series{
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mainSeries,
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linreg,
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chart.LastValueAnnotation(linreg),
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sma,
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chart.LastValueAnnotation(sma),
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},
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}
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graph.Elements = []chart.Renderable{chart.Legend(&graph)}
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res.Header().Set("Content-Type", "image/png")
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graph.Render(chart.PNG, res)
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}
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func main() {
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http.HandleFunc("/", drawChart)
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http.ListenAndServe(":8080", nil)
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}
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