294 lines
7.8 KiB
Go
294 lines
7.8 KiB
Go
package main
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import (
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"bufio"
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"bytes"
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"fmt"
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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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"github.com/wcharczuk/go-chart/drawing"
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)
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func drawChart(res http.ResponseWriter, req *http.Request) {
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xv, yv := data()
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times := chart.TimeSeries{
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Name: "Elapsed ms",
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XValues: xv,
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YValues: yv,
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}
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tma := chart.SMASeries{
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Style: chart.Style{
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Show: true,
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StrokeColor: drawing.ColorRed,
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StrokeDashArray: []float64{5.0, 5.0},
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},
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InnerSeries: times,
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Period: 50,
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}
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graph := chart.Chart{
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XAxis: chart.XAxis{
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Style: chart.Style{Show: true},
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ValueFormatter: chart.TimeMinuteValueFormatter,
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},
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YAxis: chart.YAxis{
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Style: chart.Style{Show: true},
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ValueFormatter: func(v interface{}) string {
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if typed, isTyped := v.(float64); isTyped {
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return fmt.Sprintf("%0.2fms", typed)
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}
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return ""
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},
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},
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Series: []chart.Series{
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times,
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tma,
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},
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}
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res.Header().Set("Content-Type", "image/svg+xml")
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graph.Render(chart.SVG, 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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func data() ([]time.Time, []float64) {
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var timestamps []time.Time
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var elapsed []float64
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scanner := bufio.NewScanner(bytes.NewBuffer([]byte(rawData)))
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scanner.Split(bufio.ScanLines)
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for scanner.Scan() {
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pieces := strings.Split(scanner.Text(), ",")
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hour, _ := strconv.Atoi(pieces[0])
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minute, _ := strconv.Atoi(pieces[1])
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second, _ := strconv.Atoi(pieces[2])
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now := time.Now().UTC()
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timestamps = append(timestamps, time.Date(now.Year(), now.Month(), now.Day(), hour, minute, second, 0, time.UTC))
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parsedElapsed, err := strconv.ParseFloat(pieces[3], 64)
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if err == nil {
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elapsed = append(elapsed, parsedElapsed/1000.0)
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} else {
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println(err.Error())
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}
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}
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return timestamps, elapsed
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}
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var (
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rawData = `19,39,18,12667.583333333333
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19,42,59,13186.333333333333
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19,50,49,13374.166666666667
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19,50,50,11087.7500000000000000
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19,50,59,12045.0000000000000000`
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)
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