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Work on #62: Add uptime percentage + badges

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This commit is contained in:
TwinProduction
2020-12-29 20:22:17 -05:00
parent 3eb8299316
commit bc4380db19
25 changed files with 3457 additions and 80 deletions
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108
controller/badge.go Normal file
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@ -0,0 +1,108 @@
package controller
import (
"fmt"
"net/http"
"strings"
"time"
"github.com/TwinProduction/gatus/core"
"github.com/TwinProduction/gatus/watchdog"
"github.com/gorilla/mux"
)
// badgeHandler handles the automatic generation of badge based on the group name and service name passed.
//
// Valid values for {duration}: 7d, 24h, 1h
// Pattern for {identifier}: group-<GROUP_NAME>-service-<SERVICE_NAME>.svg
func badgeHandler(writer http.ResponseWriter, request *http.Request) {
variables := mux.Vars(request)
duration := variables["duration"]
// group-<GROUP_NAME>-service-<SERVICE_NAME>.svg
identifier := variables["identifier"]
if duration != "7d" && duration != "24h" && duration != "1h" {
writer.WriteHeader(http.StatusBadRequest)
_, _ = writer.Write([]byte("Durations supported: 7d, 24h, 1h"))
return
}
parts := strings.Split(identifier, "-service-")
if len(parts) != 2 || !strings.HasPrefix(identifier, "group-") || !strings.HasSuffix(identifier, ".svg") {
writer.WriteHeader(http.StatusBadRequest)
_, _ = writer.Write([]byte("Invalid path: Pattern should look like /group-<GROUP_NAME>-service-<SERVICE_NAME>.svg"))
return
}
groupName := strings.TrimPrefix(parts[0], "group-")
serviceName := strings.TrimSuffix(parts[1], ".svg")
uptime := watchdog.GetUptimeByServiceGroupAndName(groupName, serviceName)
if uptime == nil {
writer.WriteHeader(http.StatusNotFound)
_, _ = writer.Write([]byte("Requested service not found"))
return
}
formattedDate := time.Now().Format(http.TimeFormat)
writer.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
writer.Header().Set("Date", formattedDate)
writer.Header().Set("Expires", formattedDate)
writer.Header().Set("Content-Type", "image/svg+xml")
_, _ = writer.Write(generateSVG(duration, uptime))
}
func generateSVG(duration string, uptime *core.Uptime) []byte {
var labelWidth, valueWidth, valueWidthAdjustment int
var color string
var value float64
switch duration {
case "7d":
labelWidth = 65
value = uptime.LastSevenDays
case "24h":
labelWidth = 70
value = uptime.LastTwentyFourHours
case "1h":
labelWidth = 65
value = uptime.LastHour
default:
}
if value >= 0.8 {
color = "#40cc11"
} else {
color = "#c7130a"
}
sanitizedValue := strings.TrimRight(strings.TrimRight(fmt.Sprintf("%.2f", value*100), "0"), ".") + "%"
if strings.Contains(sanitizedValue, ".") {
valueWidthAdjustment = -10
}
valueWidth = (len(sanitizedValue) * 11) + valueWidthAdjustment
width := labelWidth + valueWidth
labelX := labelWidth / 2
valueX := labelWidth + (valueWidth / 2)
svg := []byte(fmt.Sprintf(`<svg xmlns="http://www.w3.org/2000/svg" width="%d" height="20">
<linearGradient id="b" x2="0" y2="100%%">
<stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
<stop offset="1" stop-opacity=".1"/>
</linearGradient>
<mask id="a">
<rect width="%d" height="20" rx="3" fill="#fff"/>
</mask>
<g mask="url(#a)">
<path fill="#555" d="M0 0h%dv20H0z"/>
<path fill="%s" d="M%d 0h%dv20H%dz"/>
<path fill="url(#b)" d="M0 0h%dv20H0z"/>
</g>
<g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11">
<text x="%d" y="15" fill="#010101" fill-opacity=".3">
uptime %s
</text>
<text x="%d" y="14">
uptime %s
</text>
<text x="%d" y="15" fill="#010101" fill-opacity=".3">
%s
</text>
<text x="%d" y="14">
%s
</text>
</g>
</svg>`, width, width, labelWidth, color, labelWidth, valueWidth, labelWidth, width, labelX, duration, labelX, duration, valueX, sanitizedValue, valueX, sanitizedValue))
return svg
}