Improve desktop recording playback

docs/pages/desktop-access/reference/sessions.mdx

@@ -58,19 +58,15 @@ for all possible settings in the `record_session` section.
 
 ## Playback
 
-Recorded sessions can be viewed in the *Session Recordings* page under the 
+Recorded sessions can be viewed in the *Session Recordings* page under the
 *Activity* section in the *Management* area. Desktop recordings show a
 desktop icon in the first column to distinguish them from SSH recordings.
 
 ![Desktop Session Recording](../../../img/desktop-access/session-recording@2x.png)
 
-Click the play button to open the player in a new tab. The desktop session
-player supports toggling between play and pause, but does not support seeking to
-a specific point in the stream, rewinding, or restarting playback when the end
-of the stream is reached. To replay a session, refresh the page.
-
-To export desktop session recordings to video for playback outside of Teleport,
-use the `tsh recordings export` command:
+Click the play button to open the player in a new tab. To export desktop session
+recordings to video for playback outside of Teleport, use the
+`tsh recordings export` command:
 
 ```code
 $ tsh recordings export <SESSION_ID>
@@ -88,7 +84,7 @@ Be aware, desktop session recordings save PNGs of changing sections of the
 screen, which means they take up significantly more disk space than SSH or
 Kubernetes session recordings. When using async recording modes, ensure that the
 host running Teleport's Desktop Service has sufficient disk space to store
-recordings that are in progress. 
+recordings that are in progress.
 
 As a point of reference, when a full 1080p screen is redrawn (for example when
 opening a new full-sized application window), you can expect about 250kb to be

lib/srv/desktop/rdp/rdpclient/client.go

@@ -200,7 +200,7 @@ func (c *Client) Run(ctx context.Context) error {
 	case err := <-rustRDPReturnCh:
 		// Ensure the startInputStreaming goroutine returns.
 		close(stopCh)
-		return err
+		return trace.Wrap(err)
 	case err := <-inputStreamingReturnCh:
 		// Ensure the startRustRDP goroutine returns.
 		stopErr := c.stopRustRDP()
@@ -340,7 +340,7 @@ func (c *Client) startInputStreaming(stopCh chan struct{}) error {
 
 		msg, err := c.cfg.Conn.ReadMessage()
 		if utils.IsOKNetworkError(err) {
-			return err
+			return nil
 		} else if tdp.IsNonFatalErr(err) {
 			c.cfg.Conn.SendNotification(err.Error(), tdp.SeverityWarning)
 			continue

lib/web/desktop/playback.go

@@ -22,6 +22,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"time"
 
 	"github.com/gorilla/websocket"
 	"github.com/sirupsen/logrus"
@@ -47,6 +48,9 @@ const (
 
 	// actionSpeed sets the playback speed
 	actionSpeed = playbackAction("speed")
+
+	// actionSeek moves to a different position in the recording
+	actionSeek = playbackAction("seek")
 )
 
 // actionMessage is a message passed from the playback client
@@ -55,6 +59,7 @@ const (
 type actionMessage struct {
 	Action        playbackAction `json:"action"`
 	PlaybackSpeed float64        `json:"speed,omitempty"`
+	Pos           int64          `json:"pos"`
 }
 
 // ReceivePlaybackActions handles logic for receiving playbackAction messages
@@ -90,6 +95,8 @@ func ReceivePlaybackActions(
 			action.PlaybackSpeed = max(action.PlaybackSpeed, minPlaybackSpeed)
 			action.PlaybackSpeed = min(action.PlaybackSpeed, maxPlaybackSpeed)
 			player.SetSpeed(action.PlaybackSpeed)
+		case actionSeek:
+			player.SetPos(time.Duration(action.Pos) * time.Millisecond)
 		default:
 			log.Warnf("invalid desktop playback action: %v", action.Action)
 			return

web/packages/teleport/src/DesktopSession/useTdpClientCanvas.tsx

@@ -156,7 +156,7 @@ export default function useTdpClientCanvas(props: Props) {
     setClipboardSharingEnabled(false);
     setTdpConnection({
       status: 'failed',
-      statusText: error.message,
+      statusText: error.message || error.toString(),
     });
   };