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Always display every hour in the duration specified on the chart

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TwinProduction 2021-08-21 21:25:49 -04:00
parent 0e7f1d19f4
commit a626b00b59
1 changed files with 17 additions and 5 deletions
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22
controller/chart.go
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@ -1,6 +1,7 @@
package controller
import (
"log"
"math"
"net/http"
"sort"
@ -34,9 +35,9 @@ func responseTimeChartHandler(writer http.ResponseWriter, r *http.Request) {
var from time.Time
switch duration {
case "7d":
from = time.Now().Add(-24 * 7 * time.Hour)
from = time.Now().Truncate(time.Hour).Add(-24 * 7 * time.Hour)
case "24h":
from = time.Now().Add(-24 * time.Hour)
from = time.Now().Truncate(time.Hour).Add(-24 * time.Hour)
default:
writer.WriteHeader(http.StatusBadRequest)
_, _ = writer.Write([]byte("Durations supported: 7d, 24h"))
@ -54,6 +55,11 @@ func responseTimeChartHandler(writer http.ResponseWriter, r *http.Request) {
_, _ = 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{
@ -62,8 +68,16 @@ func responseTimeChartHandler(writer http.ResponseWriter, r *http.Request) {
},
}
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
@ -102,9 +116,7 @@ func responseTimeChartHandler(writer http.ResponseWriter, r *http.Request) {
}
writer.Header().Set("Content-Type", "image/svg+xml")
if err := graph.Render(chart.SVG, writer); err != nil {
writer.Header().Set("Content-Type", "text/plain")
writer.WriteHeader(http.StatusInternalServerError)
_, _ = writer.Write([]byte(err.Error()))
log.Println("[controller][responseTimeChartHandler] Failed to render response time chart:", err.Error())
return
}
}