mirror of
https://github.com/TwiN/gatus.git
synced 2024-11-07 16:44:25 +01:00
325 lines
10 KiB
Go
325 lines
10 KiB
Go
package handler
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import (
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"fmt"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/TwiN/gatus/v5/config"
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"github.com/TwiN/gatus/v5/storage/store"
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"github.com/TwiN/gatus/v5/storage/store/common"
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"github.com/TwiN/gatus/v5/storage/store/common/paging"
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"github.com/gorilla/mux"
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)
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const (
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badgeColorHexAwesome = "#40cc11"
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badgeColorHexGreat = "#94cc11"
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badgeColorHexGood = "#ccd311"
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badgeColorHexPassable = "#ccb311"
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badgeColorHexBad = "#cc8111"
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badgeColorHexVeryBad = "#c7130a"
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)
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const (
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HealthStatusUp = "up"
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HealthStatusDown = "down"
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HealthStatusUnknown = "?"
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)
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var (
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badgeColors = []string{badgeColorHexAwesome, badgeColorHexGreat, badgeColorHexGood, badgeColorHexPassable, badgeColorHexBad}
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)
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// UptimeBadge handles the automatic generation of badge based on the group name and endpoint name passed.
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//
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// Valid values for {duration}: 7d, 24h, 1h
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func UptimeBadge(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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var from time.Time
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switch duration {
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case "7d":
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from = time.Now().Add(-7 * 24 * time.Hour)
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case "24h":
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from = time.Now().Add(-24 * time.Hour)
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case "1h":
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from = time.Now().Add(-2 * time.Hour) // Because uptime metrics are stored by hour, we have to cheat a little
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default:
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http.Error(writer, "Durations supported: 7d, 24h, 1h", http.StatusBadRequest)
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return
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}
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key := variables["key"]
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uptime, err := store.Get().GetUptimeByKey(key, from, time.Now())
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if err != nil {
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if err == common.ErrEndpointNotFound {
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http.Error(writer, err.Error(), http.StatusNotFound)
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} else if err == common.ErrInvalidTimeRange {
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http.Error(writer, err.Error(), http.StatusBadRequest)
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} else {
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http.Error(writer, err.Error(), http.StatusInternalServerError)
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}
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return
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}
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writer.Header().Set("Content-Type", "image/svg+xml")
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writer.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
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writer.Header().Set("Expires", "0")
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writer.WriteHeader(http.StatusOK)
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_, _ = writer.Write(generateUptimeBadgeSVG(duration, uptime))
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}
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// ResponseTimeBadge handles the automatic generation of badge based on the group name and endpoint name passed.
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//
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// Valid values for {duration}: 7d, 24h, 1h
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func ResponseTimeBadge(config *config.Config) http.HandlerFunc {
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return func(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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var from time.Time
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switch duration {
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case "7d":
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from = time.Now().Add(-7 * 24 * time.Hour)
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case "24h":
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from = time.Now().Add(-24 * time.Hour)
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case "1h":
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from = time.Now().Add(-2 * time.Hour) // Because response time metrics are stored by hour, we have to cheat a little
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default:
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http.Error(writer, "Durations supported: 7d, 24h, 1h", http.StatusBadRequest)
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return
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}
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key := variables["key"]
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averageResponseTime, err := store.Get().GetAverageResponseTimeByKey(key, from, time.Now())
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if err != nil {
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if err == common.ErrEndpointNotFound {
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http.Error(writer, err.Error(), http.StatusNotFound)
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} else if err == common.ErrInvalidTimeRange {
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http.Error(writer, err.Error(), http.StatusBadRequest)
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} else {
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http.Error(writer, err.Error(), http.StatusInternalServerError)
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}
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return
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}
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writer.Header().Set("Content-Type", "image/svg+xml")
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writer.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
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writer.Header().Set("Expires", "0")
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writer.WriteHeader(http.StatusOK)
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_, _ = writer.Write(generateResponseTimeBadgeSVG(duration, averageResponseTime, key, config))
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}
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}
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// HealthBadge handles the automatic generation of badge based on the group name and endpoint name passed.
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func HealthBadge(writer http.ResponseWriter, request *http.Request) {
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variables := mux.Vars(request)
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key := variables["key"]
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pagingConfig := paging.NewEndpointStatusParams()
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status, err := store.Get().GetEndpointStatusByKey(key, pagingConfig.WithResults(1, 1))
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if err != nil {
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if err == common.ErrEndpointNotFound {
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http.Error(writer, err.Error(), http.StatusNotFound)
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} else if err == common.ErrInvalidTimeRange {
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http.Error(writer, err.Error(), http.StatusBadRequest)
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} else {
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http.Error(writer, err.Error(), http.StatusInternalServerError)
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}
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return
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}
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healthStatus := HealthStatusUnknown
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if len(status.Results) > 0 {
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if status.Results[0].Success {
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healthStatus = HealthStatusUp
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} else {
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healthStatus = HealthStatusDown
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}
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}
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writer.Header().Set("Content-Type", "image/svg+xml")
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writer.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
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writer.Header().Set("Expires", "0")
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writer.WriteHeader(http.StatusOK)
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_, _ = writer.Write(generateHealthBadgeSVG(healthStatus))
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}
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func generateUptimeBadgeSVG(duration string, uptime float64) []byte {
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var labelWidth, valueWidth, valueWidthAdjustment int
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switch duration {
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case "7d":
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labelWidth = 65
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case "24h":
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labelWidth = 70
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case "1h":
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labelWidth = 65
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default:
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}
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color := getBadgeColorFromUptime(uptime)
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sanitizedValue := strings.TrimRight(strings.TrimRight(fmt.Sprintf("%.2f", uptime*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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func getBadgeColorFromUptime(uptime float64) string {
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if uptime >= 0.975 {
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return badgeColorHexAwesome
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} else if uptime >= 0.95 {
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return badgeColorHexGreat
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} else if uptime >= 0.9 {
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return badgeColorHexGood
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} else if uptime >= 0.8 {
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return badgeColorHexPassable
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} else if uptime >= 0.65 {
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return badgeColorHexBad
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}
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return badgeColorHexVeryBad
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}
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func generateResponseTimeBadgeSVG(duration string, averageResponseTime int, key string, cfg *config.Config) []byte {
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var labelWidth, valueWidth int
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switch duration {
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case "7d":
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labelWidth = 105
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case "24h":
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labelWidth = 110
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case "1h":
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labelWidth = 105
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default:
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}
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color := getBadgeColorFromResponseTime(averageResponseTime, key, cfg)
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sanitizedValue := strconv.Itoa(averageResponseTime) + "ms"
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valueWidth = len(sanitizedValue) * 11
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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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response time %s
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</text>
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<text x="%d" y="14">
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response time %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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func getBadgeColorFromResponseTime(responseTime int, key string, cfg *config.Config) string {
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endpoint := cfg.GetEndpointByKey(key)
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// the threshold config requires 5 values, so we can be sure it's set here
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for i := 0; i < 5; i++ {
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if responseTime <= endpoint.UIConfig.Badge.ResponseTime.Thresholds[i] {
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return badgeColors[i]
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}
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}
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return badgeColorHexVeryBad
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}
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func generateHealthBadgeSVG(healthStatus string) []byte {
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var labelWidth, valueWidth int
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switch healthStatus {
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case HealthStatusUp:
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valueWidth = 28
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case HealthStatusDown:
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valueWidth = 44
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case HealthStatusUnknown:
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valueWidth = 10
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default:
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}
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color := getBadgeColorFromHealth(healthStatus)
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labelWidth = 48
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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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health
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</text>
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<text x="%d" y="14">
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health
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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, labelX, valueX, healthStatus, valueX, healthStatus))
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return svg
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}
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func getBadgeColorFromHealth(healthStatus string) string {
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if healthStatus == HealthStatusUp {
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return badgeColorHexAwesome
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} else if healthStatus == HealthStatusDown {
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return badgeColorHexVeryBad
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}
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return badgeColorHexPassable
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}
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