mirror of
https://github.com/bettercap/bettercap.git
synced 2024-11-07 22:20:11 -08:00
119 lines
2.9 KiB
Go
119 lines
2.9 KiB
Go
package api_rest
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import (
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"encoding/json"
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"net/http"
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"strings"
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"time"
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"github.com/bettercap/bettercap/v2/session"
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"github.com/gorilla/websocket"
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)
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const (
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// Time allowed to write an event to the client.
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writeWait = 10 * time.Second
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// Time allowed to read the next pong message from the client.
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pongWait = 60 * time.Second
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// Send pings to client with this period. Must be less than pongWait.
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pingPeriod = (pongWait * 9) / 10
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)
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func (mod *RestAPI) streamEvent(ws *websocket.Conn, event session.Event) error {
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msg, err := json.Marshal(event)
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if err != nil {
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mod.Error("Error while creating websocket message: %s", err)
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return err
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}
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ws.SetWriteDeadline(time.Now().Add(writeWait))
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if err := ws.WriteMessage(websocket.TextMessage, msg); err != nil {
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if !strings.Contains(err.Error(), "closed connection") {
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mod.Error("Error while writing websocket message: %s", err)
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return err
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}
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}
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return nil
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}
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func (mod *RestAPI) sendPing(ws *websocket.Conn) error {
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ws.SetWriteDeadline(time.Now().Add(writeWait))
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ws.SetReadDeadline(time.Now().Add(pongWait))
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if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
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mod.Error("Error while writing websocket ping message: %s", err)
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return err
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}
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return nil
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}
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func (mod *RestAPI) streamWriter(ws *websocket.Conn, w http.ResponseWriter, r *http.Request) {
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defer ws.Close()
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// first we stream what we already have
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events := session.I.Events.Sorted()
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n := len(events)
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if n > 0 {
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mod.Debug("Sending %d events.", n)
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for _, event := range events {
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if err := mod.streamEvent(ws, event); err != nil {
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return
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}
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}
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}
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session.I.Events.Clear()
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mod.Debug("Listening for events and streaming to ws endpoint ...")
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pingTicker := time.NewTicker(pingPeriod)
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listener := session.I.Events.Listen()
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defer session.I.Events.Unlisten(listener)
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for {
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select {
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case <-pingTicker.C:
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if err := mod.sendPing(ws); err != nil {
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return
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}
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case event := <-listener:
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if err := mod.streamEvent(ws, event); err != nil {
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return
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}
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case <-mod.quit:
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mod.Info("Stopping websocket events streamer ...")
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return
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}
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}
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}
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func (mod *RestAPI) streamReader(ws *websocket.Conn) {
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defer ws.Close()
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ws.SetReadLimit(512)
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ws.SetReadDeadline(time.Now().Add(pongWait))
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ws.SetPongHandler(func(string) error { ws.SetReadDeadline(time.Now().Add(pongWait)); return nil })
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for {
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_, _, err := ws.ReadMessage()
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if err != nil {
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mod.Warning("error reading message from websocket: %v", err)
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break
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}
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}
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}
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func (mod *RestAPI) startStreamingEvents(w http.ResponseWriter, r *http.Request) {
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ws, err := mod.upgrader.Upgrade(w, r, nil)
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if err != nil {
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if _, ok := err.(websocket.HandshakeError); !ok {
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mod.Error("error while updating api.rest connection to websocket: %s", err)
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}
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return
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}
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mod.Debug("websocket streaming started for %s", r.RemoteAddr)
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go mod.streamWriter(ws, w, r)
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mod.streamReader(ws)
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}
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