go-chart/examples/response_times/main.go

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package main
import (
"bufio"
"bytes"
"fmt"
"net/http"
"strconv"
"strings"
"time"
"github.com/wcharczuk/go-chart"
"github.com/wcharczuk/go-chart/drawing"
)
func drawChart(res http.ResponseWriter, req *http.Request) {
xv, yv := data()
times := chart.TimeSeries{
Name: "Elapsed ms",
XValues: xv,
YValues: yv,
}
tma := chart.SMASeries{
Style: chart.Style{
Show: true,
StrokeColor: drawing.ColorRed,
StrokeDashArray: []float64{5.0, 5.0},
},
InnerSeries: times,
Period: 50,
}
graph := chart.Chart{
XAxis: chart.XAxis{
Style: chart.Style{Show: true},
ValueFormatter: chart.TimeMinuteValueFormatter,
},
YAxis: chart.YAxis{
Style: chart.Style{Show: true},
ValueFormatter: func(v interface{}) string {
if typed, isTyped := v.(float64); isTyped {
return fmt.Sprintf("%0.2fms", typed)
}
return ""
},
},
Series: []chart.Series{
times,
tma,
},
}
res.Header().Set("Content-Type", "image/svg+xml")
graph.Render(chart.SVG, res)
}
func main() {
http.HandleFunc("/", drawChart)
http.ListenAndServe(":8080", nil)
}
func data() ([]time.Time, []float64) {
var timestamps []time.Time
var elapsed []float64
scanner := bufio.NewScanner(bytes.NewBuffer([]byte(rawData)))
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
pieces := strings.Split(scanner.Text(), ",")
hour, _ := strconv.Atoi(pieces[0])
minute, _ := strconv.Atoi(pieces[1])
second, _ := strconv.Atoi(pieces[2])
now := time.Now().UTC()
timestamps = append(timestamps, time.Date(now.Year(), now.Month(), now.Day(), hour, minute, second, 0, time.UTC))
parsedElapsed, err := strconv.ParseFloat(pieces[3], 64)
if err == nil {
elapsed = append(elapsed, parsedElapsed/1000.0)
} else {
println(err.Error())
}
}
return timestamps, elapsed
}
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