Add --profile to enable live profiling

cmd.go

@@ -26,6 +26,9 @@ import (
 	"github.com/conformal/btcwire"
 	"github.com/conformal/btcws"
 	"io/ioutil"
+	"net"
+	"net/http"
+	_ "net/http/pprof"
 	"os"
 	"path/filepath"
 	"sync"
@@ -295,6 +298,17 @@ func main() {
 		loggers = setLogLevel(cfg.DebugLevel)
 	}
 
+	if cfg.Profile != "" {
+		go func() {
+			listenAddr := net.JoinHostPort("", cfg.Profile)
+			log.Infof("Profile server listening on %s", listenAddr)
+			profileRedirect := http.RedirectHandler("/debug/pprof",
+				http.StatusSeeOther)
+			http.Handle("/", profileRedirect)
+			log.Errorf("%v", http.ListenAndServe(listenAddr, nil))
+		}()
+	}
+
 	// Open default account
 	a, err := OpenAccount(cfg, "")
 	switch err {

config.go

@@ -56,6 +56,7 @@ type config struct {
 	Proxy       string `long:"proxy" description:"Connect via SOCKS5 proxy (eg. 127.0.0.1:9050)"`
 	ProxyUser   string `long:"proxyuser" description:"Username for proxy server"`
 	ProxyPass   string `long:"proxypass" default-mask:"-" description:"Password for proxy server"`
+	Profile     string `long:"profile" description:"Enable HTTP profiling on given port -- NOTE port must be between 1024 and 65536"`
 }
 
 // cleanAndExpandPath expands environement variables and leading ~ in the