89 lines
2.0 KiB
Go
89 lines
2.0 KiB
Go
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package main
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import (
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"log"
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"net/http"
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"strings"
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"github.com/gin-gonic/gin"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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// TODO: more metrics
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var (
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_promRegistry *prometheus.Registry
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_promHttpHandler http.Handler
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promOpsProcessed = prometheus.NewCounter(prometheus.CounterOpts{
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Name: "processed_ops_total",
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Help: "The total number of processed requests",
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})
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promAddr4Count = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
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Name: "ipv4_mapped_addr_count",
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Help: "The total number of IPv4-mapped addresses",
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}, func() float64 {
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var x uint32
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addr4.Range(func(key, value any) bool {
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x++
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return true
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})
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return float64(x)
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})
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promAddr6Count = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
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Name: "ipv6_mapped_addr_count",
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Help: "The total number of IPv6-mapped addresses",
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}, func() float64 {
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var x uint32
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addr6.Range(func(key, value any) bool {
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x++
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return true
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})
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return float64(x)
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})
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labelStringReplacer *strings.Replacer = strings.NewReplacer(
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"\"", "",
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"'", "",
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)
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)
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func setupPrometheus(r *gin.Engine) {
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_promRegistry = prometheus.NewRegistry()
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_promRegistry.MustRegister(promOpsProcessed)
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_promRegistry.MustRegister(promAddr4Count)
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_promRegistry.MustRegister(promAddr6Count)
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_promHttpHandler = promhttp.HandlerFor(_promRegistry, promhttp.HandlerOpts{
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Registry: _promRegistry,
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EnableOpenMetrics: true,
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ErrorHandling: promhttp.ContinueOnError,
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ErrorLog: log.Default(),
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DisableCompression: true,
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})
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r.GET("/metrics", promHttpHandler)
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r.GET("/metrics/", func(c *gin.Context) {
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c.Redirect(http.StatusMovedPermanently, "/metrics")
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})
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}
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func promSanitizeLabel(str string, fallback string) string {
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out := strings.ToValidUTF8(str, "")
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out = labelStringReplacer.Replace(out)
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out = strings.TrimSpace(out)
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if out == "" {
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return fallback
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}
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return out
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}
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func promHttpHandler(c *gin.Context) {
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promOpsProcessed.Inc()
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_promHttpHandler.ServeHTTP(c.Writer, c.Request)
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}
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