80 lines
1.7 KiB
Go
80 lines
1.7 KiB
Go
// Usage: http://localhost:8080?series=100&values=1000
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"math/rand"
|
|
"net/http"
|
|
"strconv"
|
|
"time"
|
|
|
|
"git.fireandbrimst.one/aw/go-chart"
|
|
)
|
|
|
|
func random(min, max float64) float64 {
|
|
return rand.Float64()*(max-min) + min
|
|
}
|
|
|
|
func drawLargeChart(res http.ResponseWriter, r *http.Request) {
|
|
numSeriesInt64, err := strconv.ParseInt(r.FormValue("series"), 10, 64)
|
|
if err != nil {
|
|
numSeriesInt64 = int64(1)
|
|
}
|
|
if numSeriesInt64 == 0 {
|
|
numSeriesInt64 = 1
|
|
}
|
|
numSeries := int(numSeriesInt64)
|
|
|
|
numValuesInt64, err := strconv.ParseInt(r.FormValue("values"), 10, 64)
|
|
if err != nil {
|
|
numValuesInt64 = int64(100)
|
|
}
|
|
if numValuesInt64 == 0 {
|
|
numValuesInt64 = int64(100)
|
|
}
|
|
numValues := int(numValuesInt64)
|
|
|
|
series := make([]chart.Series, numSeries)
|
|
|
|
for i := 0; i < numSeries; i++ {
|
|
xValues := make([]time.Time, numValues)
|
|
yValues := make([]float64, numValues)
|
|
|
|
for j := 0; j < numValues; j++ {
|
|
xValues[j] = time.Now().AddDate(0, 0, (numValues-j)*-1)
|
|
yValues[j] = random(float64(-500), float64(500))
|
|
}
|
|
|
|
series[i] = chart.TimeSeries{
|
|
Name: fmt.Sprintf("aaa.bbb.hostname-%v.ccc.ddd.eee.fff.ggg.hhh.iii.jjj.kkk.lll.mmm.nnn.value", i),
|
|
XValues: xValues,
|
|
YValues: yValues,
|
|
}
|
|
}
|
|
|
|
graph := chart.Chart{
|
|
XAxis: chart.XAxis{
|
|
Name: "Time",
|
|
NameStyle: chart.StyleShow(),
|
|
Style: chart.StyleShow(),
|
|
},
|
|
YAxis: chart.YAxis{
|
|
Name: "Value",
|
|
NameStyle: chart.StyleShow(),
|
|
Style: chart.StyleShow(),
|
|
},
|
|
Series: series,
|
|
}
|
|
|
|
res.Header().Set("Content-Type", "image/png")
|
|
graph.Render(chart.PNG, res)
|
|
}
|
|
|
|
func main() {
|
|
http.HandleFunc("/", drawLargeChart)
|
|
http.HandleFunc("/favico.ico", func(res http.ResponseWriter, req *http.Request) {
|
|
res.Write([]byte{})
|
|
})
|
|
http.ListenAndServe(":8080", nil)
|
|
}
|