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twin-gatus/controller/chart.go

122 lines
3.4 KiB
Go

package controller
import (
"log"
"math"
"net/http"
"sort"
"time"
"github.com/TwinProduction/gatus/storage"
"github.com/TwinProduction/gatus/storage/store/common"
"github.com/gorilla/mux"
"github.com/wcharczuk/go-chart/v2"
"github.com/wcharczuk/go-chart/v2/drawing"
)
const timeFormat = "3:04PM"
var (
gridStyle = chart.Style{
StrokeColor: drawing.Color{R: 119, G: 119, B: 119, A: 40},
StrokeWidth: 1.0,
}
axisStyle = chart.Style{
FontColor: drawing.Color{R: 119, G: 119, B: 119, A: 255},
}
transparentStyle = chart.Style{
FillColor: drawing.Color{R: 255, G: 255, B: 255, A: 0},
}
)
func responseTimeChartHandler(writer http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
duration := vars["duration"]
var from time.Time
switch duration {
case "7d":
from = time.Now().Truncate(time.Hour).Add(-24 * 7 * time.Hour)
case "24h":
from = time.Now().Truncate(time.Hour).Add(-24 * time.Hour)
default:
writer.WriteHeader(http.StatusBadRequest)
_, _ = writer.Write([]byte("Durations supported: 7d, 24h"))
return
}
hourlyAverageResponseTime, err := storage.Get().GetHourlyAverageResponseTimeByKey(vars["key"], from, time.Now())
if err != nil {
if err == common.ErrServiceNotFound {
writer.WriteHeader(http.StatusNotFound)
} else if err == common.ErrInvalidTimeRange {
writer.WriteHeader(http.StatusBadRequest)
} else {
writer.WriteHeader(http.StatusInternalServerError)
}
_, _ = writer.Write([]byte(err.Error()))
return
}
if len(hourlyAverageResponseTime) == 0 {
writer.WriteHeader(http.StatusNoContent)
_, _ = writer.Write(nil)
return
}
series := chart.TimeSeries{
Name: "Average response time per hour",
Style: chart.Style{
StrokeWidth: 1.5,
DotWidth: 2.0,
},
}
keys := make([]int, 0, len(hourlyAverageResponseTime))
earliestTimestamp := int64(0)
for hourlyTimestamp := range hourlyAverageResponseTime {
keys = append(keys, int(hourlyTimestamp))
if earliestTimestamp == 0 || hourlyTimestamp < earliestTimestamp {
earliestTimestamp = hourlyTimestamp
}
}
for earliestTimestamp > from.Unix() {
earliestTimestamp -= int64(time.Hour.Seconds())
keys = append(keys, int(earliestTimestamp))
}
sort.Ints(keys)
var maxAverageResponseTime float64
for _, key := range keys {
averageResponseTime := float64(hourlyAverageResponseTime[int64(key)])
if maxAverageResponseTime < averageResponseTime {
maxAverageResponseTime = averageResponseTime
}
series.XValues = append(series.XValues, time.Unix(int64(key), 0))
series.YValues = append(series.YValues, averageResponseTime)
}
graph := chart.Chart{
Canvas: transparentStyle,
Background: transparentStyle,
Width: 1280,
Height: 300,
XAxis: chart.XAxis{
ValueFormatter: chart.TimeValueFormatterWithFormat(timeFormat),
GridMajorStyle: gridStyle,
GridMinorStyle: gridStyle,
Style: axisStyle,
NameStyle: axisStyle,
},
YAxis: chart.YAxis{
Name: "Average response time",
GridMajorStyle: gridStyle,
GridMinorStyle: gridStyle,
Style: axisStyle,
NameStyle: axisStyle,
Range: &chart.ContinuousRange{
Min: 0,
Max: math.Ceil(maxAverageResponseTime * 1.25),
},
},
Series: []chart.Series{series},
}
writer.Header().Set("Content-Type", "image/svg+xml")
if err := graph.Render(chart.SVG, writer); err != nil {
log.Println("[controller][responseTimeChartHandler] Failed to render response time chart:", err.Error())
return
}
}