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Merge pull request #11 from boinkor-net/prometheus
Serve prometheus metrics
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1 @@ | ||
| sha256-s/BwC3UXRO9jffeM91Xm8HojVCpuLkwFuwsumkCt2SQ= | ||
| sha256-Q3uOv8iG6qGlSlM27wmeXxtD20KnWROqe4tTFS0c9cI= |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| package hoopsnake | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
| "net/http" | ||
| "os" | ||
| "time" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promauto" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| "tailscale.com/tsnet" | ||
| ) | ||
|
|
||
| func (s *TailnetSSH) setupPrometheus(srv *tsnet.Server) error { | ||
| if s.prometheusAddr == "" { | ||
| return nil | ||
| } | ||
| mux := http.NewServeMux() | ||
| mux.Handle("/metrics", promhttp.Handler()) | ||
| listener, err := srv.Listen("tcp", s.prometheusAddr) | ||
| if err != nil { | ||
| return fmt.Errorf("could not listen on prometheus address %v: %w", s.prometheusAddr, err) | ||
| } | ||
| go func() { | ||
| server := http.Server{ | ||
| Handler: mux, | ||
| ReadHeaderTimeout: 1 * time.Second, | ||
| } | ||
| log.Printf("Failed to listen on prometheus address: %v", server.Serve(listener)) | ||
| os.Exit(20) | ||
| }() | ||
|
|
||
| v4, v6 := srv.TailscaleIPs() | ||
| promauto.NewGaugeFunc(prometheus.GaugeOpts{ | ||
| Name: "hoopsnake_running", | ||
| Help: "A counter set to 1.0 if hoopsnake is running.", | ||
| ConstLabels: prometheus.Labels{ | ||
| "ipv4": v4.String(), | ||
| "ipv6": v6.String(), | ||
| "hostname": srv.Hostname, | ||
| }, | ||
| }, func() float64 { return 1.0 }) | ||
| listenAddr := s.prometheusAddr | ||
| if listenAddr[0] == ':' { | ||
| listenAddr = v4.String() + listenAddr | ||
| } | ||
|
|
||
| log.Printf("Serving prometheus metrics at http://%s/metrics", listenAddr) | ||
| return nil | ||
| } |
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