some progress but still doesn't work

modules/api_rest.go

@@ -10,6 +10,8 @@ import (
 	"github.com/bettercap/bettercap/log"
 	"github.com/bettercap/bettercap/session"
 	"github.com/bettercap/bettercap/tls"
+
+	"github.com/gorilla/websocket"
 )
 
 type RestAPI struct {
@@ -20,13 +22,21 @@ type RestAPI struct {
 	certFile      string
 	keyFile       string
 	useWebsocket  bool
+	upgrader      websocket.Upgrader
+	eventListener <-chan session.Event
+	quit          chan bool
 }
 
 func NewRestAPI(s *session.Session) *RestAPI {
 	api := &RestAPI{
 		SessionModule: session.NewSessionModule("api.rest", s),
 		server:        &http.Server{},
+		quit:          make(chan bool),
 		useWebsocket:  false,
+		upgrader: websocket.Upgrader{
+			ReadBufferSize:  1024,
+			WriteBufferSize: 1024,
+		},
 	}
 
 	api.AddParam(session.NewStringParameter("api.rest.address",
@@ -163,6 +173,10 @@ func (api *RestAPI) Start() error {
 
 func (api *RestAPI) Stop() error {
 	return api.SetRunning(false, func() {
+		go func() {
+			api.quit <- true
+		}()
+
 		ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
 		defer cancel()
 		api.server.Shutdown(ctx)

modules/api_rest_controller.go

@@ -5,8 +5,21 @@ import (
 	"encoding/json"
 	"net/http"
 	"strconv"
+	"time"
 
+	"github.com/bettercap/bettercap/log"
 	"github.com/bettercap/bettercap/session"
+
+	"github.com/gorilla/websocket"
+)
+
+const (
+	// Time allowed to write an event to the client.
+	writeWait = 10 * time.Second
+	// Time allowed to read the next pong message from the client.
+	pongWait = 60 * time.Second
+	// Send pings to client with this period. Must be less than pongWait.
+	pingPeriod = (pongWait * 9) / 10
 )
 
 type CommandRequest struct {
@@ -18,7 +31,9 @@ type APIResponse struct {
 	Message string `json:"msg"`
 }
 
-func setAuthFailed(w http.ResponseWriter) {
+func setAuthFailed(w http.ResponseWriter, r *http.Request) {
+	log.Warning("Unauthorized authentication attempt from %s", r.RemoteAddr)
+
 	w.Header().Set("WWW-Authenticate", `Basic realm="auth"`)
 	w.WriteHeader(401)
 	w.Write([]byte("Unauthorized"))
@@ -66,9 +81,100 @@ func (api *RestAPI) runSessionCommand(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func (api *RestAPI) streamWriter(ws *websocket.Conn, w http.ResponseWriter, r *http.Request) {
+	defer ws.Close()
+
+	// first we stream what we already have
+	events := session.I.Events.Sorted()
+	n := len(events)
+	if n > 0 {
+		log.Info("Sending %d events.", n)
+		for _, event := range events {
+			msg, err := json.Marshal(event)
+			if err != nil {
+				log.Error("Error while creating websocket message: %s", err)
+				return
+			}
+
+			ws.SetWriteDeadline(time.Now().Add(writeWait))
+			if err := ws.WriteMessage(websocket.TextMessage, msg); err != nil {
+				log.Error("Error while writing websocket message: %s", err)
+				return
+			}
+		}
+	}
+
+	session.I.Events.Clear()
+
+	log.Info("Listening for events and streaming to ws endpoint ...")
+
+	api.eventListener = api.Session.Events.Listen()
+
+	pingTicker := time.NewTicker(pingPeriod)
+
+	for {
+		select {
+		case <-pingTicker.C:
+			ws.SetWriteDeadline(time.Now().Add(writeWait))
+			log.Info("Ping")
+			if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
+				log.Error("Error while writing websocket ping message: %s", err)
+				return
+			}
+		case event := <-api.eventListener:
+			log.Info("Event")
+			msg, err := json.Marshal(event)
+			if err != nil {
+				log.Error("Error while creating websocket message: %s", err)
+				continue
+			}
+
+			ws.SetWriteDeadline(time.Now().Add(writeWait))
+			if err := ws.WriteMessage(websocket.TextMessage, msg); err != nil {
+				log.Error("Error while writing websocket message: %s", err)
+				return
+			}
+			log.Info("Sent")
+
+		case <-api.quit:
+			log.Info("Quit")
+			return
+		}
+	}
+}
+
+func (api *RestAPI) streamReader(ws *websocket.Conn) {
+	defer ws.Close()
+	ws.SetReadLimit(512)
+	ws.SetReadDeadline(time.Now().Add(pongWait))
+	ws.SetPongHandler(func(string) error { ws.SetReadDeadline(time.Now().Add(pongWait)); return nil })
+	for {
+		_, _, err := ws.ReadMessage()
+		if err != nil {
+			log.Info("Closing reader.")
+			break
+		}
+	}
+}
+
 func (api *RestAPI) showEvents(w http.ResponseWriter, r *http.Request) {
 	var err error
 
+	if api.useWebsocket {
+		ws, err := api.upgrader.Upgrade(w, r, nil)
+		if err != nil {
+			if _, ok := err.(websocket.HandshakeError); !ok {
+				log.Error("Error while updating api.rest connection to websocket: %s", err)
+			}
+			return
+		}
+
+		log.Info("Websocket streaming started for %s", r.RemoteAddr)
+
+		go api.streamWriter(ws, w, r)
+		api.streamReader(ws)
+	} else {
+
 		events := session.I.Events.Sorted()
 		nmax := len(events)
 		n := nmax
@@ -87,6 +193,7 @@ func (api *RestAPI) showEvents(w http.ResponseWriter, r *http.Request) {
 		}
 
 		toJSON(w, events[0:n])
+	}
 }
 
 func (api *RestAPI) clearEvents(w http.ResponseWriter, r *http.Request) {
@@ -97,7 +204,7 @@ func (api *RestAPI) sessionRoute(w http.ResponseWriter, r *http.Request) {
 	setSecurityHeaders(w)
 
 	if api.checkAuth(r) == false {
-		setAuthFailed(w)
+		setAuthFailed(w, r)
 	} else if r.Method == "GET" {
 		api.showSession(w, r)
 	} else if r.Method == "POST" {
@@ -111,7 +218,7 @@ func (api *RestAPI) eventsRoute(w http.ResponseWriter, r *http.Request) {
 	setSecurityHeaders(w)
 
 	if api.checkAuth(r) == false {
-		setAuthFailed(w)
+		setAuthFailed(w, r)
 	} else if r.Method == "GET" {
 		api.showEvents(w, r)
 	} else if r.Method == "DELETE" {

modules/events_stream.go

@@ -15,6 +15,7 @@ type EventsStream struct {
 	ignoreList    *IgnoreList
 	waitFor       string
 	waitChan      chan *session.Event
+	eventListener <-chan session.Event
 	quit          chan bool
 }
 
@@ -124,10 +125,12 @@ func (s *EventsStream) Configure() error {
 
 func (s *EventsStream) Start() error {
 	return s.SetRunning(true, func() {
+
+		s.eventListener = s.Session.Events.Listen()
 		for {
 			var e session.Event
 			select {
-			case e = <-s.Session.Events.NewEvents:
+			case e = <-s.eventListener:
 				if e.Tag == s.waitFor {
 					s.waitFor = ""
 					s.waitChan <- &e

session/events.go

@@ -39,21 +39,29 @@ func (e Event) Label() string {
 type EventPool struct {
 	sync.Mutex
 
-	NewEvents chan Event
 	debug     bool
 	silent    bool
 	events    []Event
+	listeners []chan Event
 }
 
 func NewEventPool(debug bool, silent bool) *EventPool {
 	return &EventPool{
-		NewEvents: make(chan Event, 0xff),
 		debug:     debug,
 		silent:    silent,
 		events:    make([]Event, 0),
+		listeners: make([]chan Event, 0),
 	}
 }
 
+func (p *EventPool) Listen() <-chan Event {
+	p.Lock()
+	defer p.Unlock()
+	l := make(chan Event)
+	p.listeners = append(p.listeners, l)
+	return l
+}
+
 func (p *EventPool) SetSilent(s bool) {
 	p.Lock()
 	defer p.Unlock()
@@ -71,7 +79,11 @@ func (p *EventPool) Add(tag string, data interface{}) {
 	defer p.Unlock()
 	e := NewEvent(tag, data)
 	p.events = append([]Event{e}, p.events...)
-	p.NewEvents <- e
+
+	// broadcast the event to every listener
+	for _, l := range p.listeners {
+		l <- e
+	}
 }
 
 func (p *EventPool) Log(level int, format string, args ...interface{}) {