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cmd/derper: add default-off debug endpoint for profiling
Updates https://github.com/tailscale/corp/issues/11492 Signed-off-by: Tom DNetto <tom@tailscale.com>
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@ -12,15 +12,19 @@
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"expvar"
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"flag"
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"fmt"
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"html"
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"io"
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"log"
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"math"
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"net"
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"net/http"
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"net/http/pprof"
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"net/netip"
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"os"
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"path/filepath"
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"regexp"
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"runtime"
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"strconv"
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"strings"
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"time"
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@ -33,6 +37,7 @@
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"tailscale.com/net/stun"
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"tailscale.com/tsweb"
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"tailscale.com/types/key"
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"tailscale.com/version"
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)
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var (
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@ -55,6 +60,8 @@
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acceptConnLimit = flag.Float64("accept-connection-limit", math.Inf(+1), "rate limit for accepting new connection")
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acceptConnBurst = flag.Int("accept-connection-burst", math.MaxInt, "burst limit for accepting new connection")
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debugAddr = flag.String("debug_addr", "", "listening address for debug server")
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)
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var (
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@ -136,6 +143,7 @@ func main() {
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if *dev {
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*addr = ":3340" // above the keys DERP
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*debugAddr = "localhost:8383"
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log.Printf("Running in dev mode.")
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tsweb.DevMode = true
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}
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@ -222,6 +230,11 @@ func main() {
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go serveSTUN(listenHost, *stunPort)
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}
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if *debugAddr != "" {
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log.Printf("running debug server on %s", *debugAddr)
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go runDebugServer(*debugAddr, s)
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}
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quietLogger := log.New(logFilter{}, "", 0)
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httpsrv := &http.Server{
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Addr: *addr,
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@ -513,3 +526,79 @@ func (logFilter) Write(p []byte) (int, error) {
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log.Printf("%s", p)
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return len(p), nil
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}
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func runDebugServer(addr string, s *derp.Server) {
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mux := http.NewServeMux()
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mux.Handle("/debug/vars", http.DefaultServeMux) // serve out expvar
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mux.HandleFunc("/debug/varz", tsweb.VarzHandler) // expvar but in prometheus format
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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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mux.Handle("/debug/pprofrate", http.HandlerFunc(handlePprofRate))
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mux.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.WriteHeader(200)
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fmt.Fprintf(w, `<html><body>
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<h1>DERP</h1>
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<p>
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This is a Tailscale DERP debug server.
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</p>
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<ul>
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<li>Version: <pre style="display: inline">%s</pre>
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<li><a href="/debug/vars">/debug/vars</a> (JSON)</li>
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<li><a href="/debug/varz">/debug/varz</a> (Prometheus)</li>
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<li><a href="/debug/pprof">/debug/pprof</a></li>
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<li><a href="/debug/pprof/goroutine?debug=1">/debug/pprof/goroutine?debug=1</a> (goroutine summary)</li>
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</ul>
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`, html.EscapeString(version.Long()))
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}))
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srv := &http.Server{
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Addr: addr,
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Handler: mux,
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}
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if err := srv.ListenAndServe(); err != nil {
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if err != http.ErrServerClosed {
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log.Fatal(err)
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}
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}
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}
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// handlePprofRate adjusts the pprof rate.
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//
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// $ curl -d block=0 http://localhost:8383/debug/pprofrate
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// $ curl -d mutex=0 http://localhost:8383/debug/pprofrate
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//
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// See:
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//
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// - https://pkg.go.dev/runtime#SetMutexProfileFraction
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// - https://pkg.go.dev/runtime#SetBlockProfileRate
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//
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// And corp#5277.
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func handlePprofRate(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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http.Error(w, "method not allowed; want POST", http.StatusMethodNotAllowed)
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return
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}
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if s := r.FormValue("block"); s != "" {
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v, err := strconv.Atoi(s)
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if err != nil {
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http.Error(w, "bad block value", http.StatusBadRequest)
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return
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}
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runtime.SetBlockProfileRate(v)
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fmt.Fprintf(w, "block set to %v\n", v)
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}
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if s := r.FormValue("mutex"); s != "" {
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v, err := strconv.Atoi(s)
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if err != nil {
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http.Error(w, "bad mutex value", http.StatusBadRequest)
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return
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}
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old := runtime.SetMutexProfileFraction(v)
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fmt.Fprintf(w, "mutex changed from %v to %v\n", old, v)
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}
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}
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