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