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new: implemented optional websocket for /api/events

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This commit is contained in:
evilsocket 2018-03-06 13:54:37 +01:00
parent b243e67828
commit 5ad1a17118
4 changed files with 66 additions and 36 deletions
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68
modules/api_rest_controller.go
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@ -5,6 +5,7 @@ import (
"encoding/json"
"net/http"
"strconv"
"strings"
"time"
"github.com/bettercap/bettercap/log"
@ -81,6 +82,33 @@ func (api *RestAPI) runSessionCommand(w http.ResponseWriter, r *http.Request) {
}
}
func (api *RestAPI) streamEvent(ws *websocket.Conn, event session.Event) error {
msg, err := json.Marshal(event)
if err != nil {
log.Error("Error while creating websocket message: %s", err)
return err
}
ws.SetWriteDeadline(time.Now().Add(writeWait))
if err := ws.WriteMessage(websocket.TextMessage, msg); err != nil {
if !strings.Contains(err.Error(), "closed connection") {
log.Error("Error while writing websocket message: %s", err)
return err
}
}
return nil
}
func (api *RestAPI) sendPing(ws *websocket.Conn) error {
ws.SetWriteDeadline(time.Now().Add(writeWait))
if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
log.Error("Error while writing websocket ping message: %s", err)
return err
}
return nil
}
func (api *RestAPI) streamWriter(ws *websocket.Conn, w http.ResponseWriter, r *http.Request) {
defer ws.Close()
@ -88,17 +116,9 @@ func (api *RestAPI) streamWriter(ws *websocket.Conn, w http.ResponseWriter, r *h
events := session.I.Events.Sorted()
n := len(events)
if n > 0 {
log.Info("Sending %d events.", n)
log.Debug("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)
if err := api.streamEvent(ws, event); err != nil {
return
}
}
@ -106,38 +126,22 @@ func (api *RestAPI) streamWriter(ws *websocket.Conn, w http.ResponseWriter, r *h
session.I.Events.Clear()
log.Info("Listening for events and streaming to ws endpoint ...")
api.eventListener = api.Session.Events.Listen()
log.Debug("Listening for events and streaming to ws endpoint ...")
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)
if err := api.sendPing(ws); err != nil {
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)
if err := api.streamEvent(ws, event); err != nil {
return
}
log.Info("Sent")
case <-api.quit:
log.Info("Quit")
log.Info("Stopping websocket events streamer ...")
return
}
}
@ -151,7 +155,7 @@ func (api *RestAPI) streamReader(ws *websocket.Conn) {
for {
_, _, err := ws.ReadMessage()
if err != nil {
log.Info("Closing reader.")
log.Debug("Closing websocket reader.")
break
}
}
@ -169,7 +173,7 @@ func (api *RestAPI) showEvents(w http.ResponseWriter, r *http.Request) {
return
}
log.Info("Websocket streaming started for %s", r.RemoteAddr)
log.Debug("Websocket streaming started for %s", r.RemoteAddr)
go api.streamWriter(ws, w, r)
api.streamReader(ws)