loopd: add profiler to the Loop daemon

Author: bhandras

loopd/daemon.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"net"
 	"net/http"
+	_ "net/http/pprof" //nolint:gosec
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -133,6 +134,16 @@ func (d *Daemon) Start() error {
 		return errOnlyStartOnce
 	}
 
+	go func() {
+		http.Handle("/", http.RedirectHandler(
+			"/debug/pprof", http.StatusSeeOther,
+		))
+
+		listenAddr := fmt.Sprintf(":%d", 4321)
+		infof("Starting profile server at %s", listenAddr)
+		fmt.Println(http.ListenAndServe(listenAddr, nil)) // nolint: gosec
+	}()
+
 	network := lndclient.Network(d.cfg.Network)
 
 	var err error