✨ feat: Add streaming support (#125)

This adds:
- [x] Keyboard and mouse handling on the frontend
- [x] Video and audio streaming from the backend to the frontend
- [x] Input server that works with Websockets

Update - 17/11
- [ ] Master docker container to run this
- [ ] Steam runtime
- [ ] Entrypoint.sh

---------

Co-authored-by: Kristian Ollikainen <14197772+DatCaptainHorse@users.noreply.github.com>
Co-authored-by: Kristian Ollikainen <DatCaptainHorse@users.noreply.github.com>

packages/relay/internal/participant.go

@@ -0,0 +1,69 @@
+package relay
+
+import (
+	"fmt"
+	"github.com/google/uuid"
+	"github.com/pion/webrtc/v4"
+	"math/rand"
+)
+
+type Participant struct {
+	ID             uuid.UUID //< Internal IDs are useful to keeping unique internal track and not have conflicts later
+	Name           string
+	WebSocket      *SafeWebSocket
+	PeerConnection *webrtc.PeerConnection
+	DataChannel    *NestriDataChannel
+}
+
+func NewParticipant(ws *SafeWebSocket) *Participant {
+	return &Participant{
+		ID:        uuid.New(),
+		Name:      createRandomName(),
+		WebSocket: ws,
+	}
+}
+
+func (vw *Participant) addTrack(trackLocal *webrtc.TrackLocal) error {
+	rtpSender, err := vw.PeerConnection.AddTrack(*trackLocal)
+	if err != nil {
+		return err
+	}
+
+	go func() {
+		rtcpBuffer := make([]byte, 1400)
+		for {
+			if _, _, rtcpErr := rtpSender.Read(rtcpBuffer); rtcpErr != nil {
+				return
+			}
+		}
+	}()
+
+	return nil
+}
+
+func (vw *Participant) signalOffer() error {
+	if vw.PeerConnection == nil {
+		return fmt.Errorf("peer connection is nil for participant: '%s' - cannot signal offer", vw.ID)
+	}
+
+	offer, err := vw.PeerConnection.CreateOffer(nil)
+	if err != nil {
+		return err
+	}
+
+	err = vw.PeerConnection.SetLocalDescription(offer)
+	if err != nil {
+		return err
+	}
+
+	return vw.WebSocket.SendSDPMessageWS(offer)
+}
+
+var namesFirst = []string{"Happy", "Sad", "Angry", "Calm", "Excited", "Bored", "Confused", "Confident", "Curious", "Depressed", "Disappointed", "Embarrassed", "Energetic", "Fearful", "Frustrated", "Glad", "Guilty", "Hopeful", "Impatient", "Jealous", "Lonely", "Motivated", "Nervous", "Optimistic", "Pessimistic", "Proud", "Relaxed", "Shy", "Stressed", "Surprised", "Tired", "Worried"}
+var namesSecond = []string{"Dragon", "Unicorn", "Troll", "Goblin", "Elf", "Dwarf", "Ogre", "Gnome", "Mermaid", "Siren", "Vampire", "Ghoul", "Werewolf", "Minotaur", "Centaur", "Griffin", "Phoenix", "Wyvern", "Hydra", "Kraken"}
+
+func createRandomName() string {
+	randomFirst := namesFirst[rand.Intn(len(namesFirst))]
+	randomSecond := namesSecond[rand.Intn(len(namesSecond))]
+	return randomFirst + " " + randomSecond
+}