✨ 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/flags.go

@@ -0,0 +1,82 @@
+package relay
+
+import (
+	"flag"
+	"log"
+	"os"
+	"strconv"
+
+	"github.com/pion/webrtc/v4"
+)
+
+var globalFlags *Flags
+
+type Flags struct {
+	Verbose        bool
+	Debug          bool
+	EndpointPort   int
+	WebRTCUDPStart int
+	WebRTCUDPEnd   int
+	STUNServer     string
+}
+
+func (flags *Flags) DebugLog() {
+	log.Println("Relay Flags:")
+	log.Println("> Verbose: ", flags.Verbose)
+	log.Println("> Debug: ", flags.Debug)
+	log.Println("> Endpoint Port: ", flags.EndpointPort)
+	log.Println("> WebRTC UDP Range Start: ", flags.WebRTCUDPStart)
+	log.Println("> WebRTC UDP Range End: ", flags.WebRTCUDPEnd)
+	log.Println("> WebRTC STUN Server: ", flags.STUNServer)
+}
+
+func getEnvAsInt(name string, defaultVal int) int {
+	valueStr := os.Getenv(name)
+	if value, err := strconv.Atoi(valueStr); err != nil {
+		return defaultVal
+	} else {
+		return value
+	}
+}
+
+func getEnvAsBool(name string, defaultVal bool) bool {
+	valueStr := os.Getenv(name)
+	val, err := strconv.ParseBool(valueStr)
+	if err != nil {
+		return defaultVal
+	}
+	return val
+}
+
+func getEnvAsString(name string, defaultVal string) string {
+	valueStr := os.Getenv(name)
+	if len(valueStr) == 0 {
+		return defaultVal
+	}
+	return valueStr
+}
+
+func InitFlags() {
+	// Create Flags struct
+	globalFlags = &Flags{}
+	// Get flags
+	flag.BoolVar(&globalFlags.Verbose, "verbose", getEnvAsBool("VERBOSE", false), "Verbose mode")
+	flag.BoolVar(&globalFlags.Debug, "debug", getEnvAsBool("DEBUG", false), "Debug mode")
+	flag.IntVar(&globalFlags.EndpointPort, "endpointPort", getEnvAsInt("ENDPOINT_PORT", 8088), "HTTP endpoint port")
+	flag.IntVar(&globalFlags.WebRTCUDPStart, "webrtcUDPStart", getEnvAsInt("WEBRTC_UDP_START", 10000), "WebRTC UDP port range start")
+	flag.IntVar(&globalFlags.WebRTCUDPEnd, "webrtcUDPEnd", getEnvAsInt("WEBRTC_UDP_END", 20000), "WebRTC UDP port range end")
+	flag.StringVar(&globalFlags.STUNServer, "stunServer", getEnvAsString("STUN_SERVER", "stun.l.google.com:19302"), "WebRTC STUN server")
+	// Parse flags
+	flag.Parse()
+
+	// ICE STUN servers
+	globalWebRTCConfig.ICEServers = []webrtc.ICEServer{
+		{
+			URLs: []string{"stun:" + globalFlags.STUNServer},
+		},
+	}
+}
+
+func GetFlags() *Flags {
+	return globalFlags
+}