mirror of
https://github.com/sot-tech/mochi.git
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96653c45a3
Might be used when tracker is behind reverse proxy and one of provided addresses in `real_ip_header` is private/local address. Additional changes: * check if provided address is not multicast/broadcast * configure `http.Server.ReadHeaderTimeout` with `http.ReadTimeout` to mitigate Slowloris * update dependencies * minor docs fixes
95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
// Package metrics implements a standalone HTTP server for serving pprof
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// profiles and Prometheus metrics.
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package metrics
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import (
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"context"
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"errors"
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"net/http"
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"net/http/pprof"
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"net/netip"
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"sync/atomic"
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"time"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/sot-tech/mochi/pkg/log"
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"github.com/sot-tech/mochi/pkg/stop"
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)
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const (
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readTimeout = 5 * time.Second
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writeTimeout = readTimeout * 2
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)
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var (
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logger = log.NewLogger("metrics")
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serverCounter = new(int32)
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)
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// Enabled indicates that configured at least one metrics server
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func Enabled() bool {
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return atomic.LoadInt32(serverCounter) > 0
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}
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// Server represents a standalone HTTP server for serving a Prometheus metrics
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// endpoint.
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type Server struct {
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srv *http.Server
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}
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// AddressFamily returns the label value for reporting the address family of an IP address.
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func AddressFamily(ip netip.Addr) string {
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switch {
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case ip.Is4(), ip.Is4In6():
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return "IPv4"
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case ip.Is6():
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return "IPv6"
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default:
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return "<unknown>"
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}
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}
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// Stop shuts down the server.
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func (s *Server) Stop() stop.Result {
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c := make(stop.Channel)
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go func() {
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c.Done(s.srv.Shutdown(context.Background()))
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}()
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return c.Result()
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}
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// NewServer creates a new instance of a Prometheus server that asynchronously
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// serves requests.
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func NewServer(addr string) *Server {
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mux := http.NewServeMux()
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mux.Handle("/metrics", promhttp.Handler())
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mux.HandleFunc("/debug/pprof/", pprof.Index)
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mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
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mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
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mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
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mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
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s := &Server{
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srv: &http.Server{
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Addr: addr,
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Handler: mux,
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ReadTimeout: readTimeout,
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ReadHeaderTimeout: readTimeout,
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WriteTimeout: writeTimeout,
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},
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}
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go func() {
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atomic.AddInt32(serverCounter, 1)
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defer atomic.AddInt32(serverCounter, -1)
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if err := s.srv.ListenAndServe(); !errors.Is(err, http.ErrServerClosed) {
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logger.Error().Err(err).Msg("failed while serving prometheus")
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}
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}()
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return s
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}
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