install go2rtc on bob

installs_on_host/go2rtc/internal/ngrok/ngrok.go

@@ -0,0 +1,84 @@
+package ngrok
+
+import (
+	"fmt"
+	"net"
+	"strings"
+
+	"github.com/AlexxIT/go2rtc/internal/app"
+	"github.com/AlexxIT/go2rtc/internal/webrtc"
+	"github.com/AlexxIT/go2rtc/pkg/ngrok"
+	"github.com/rs/zerolog"
+)
+
+func Init() {
+	var cfg struct {
+		Mod struct {
+			Cmd string `yaml:"command"`
+		} `yaml:"ngrok"`
+	}
+
+	app.LoadConfig(&cfg)
+
+	if cfg.Mod.Cmd == "" {
+		return
+	}
+
+	log = app.GetLogger("ngrok")
+
+	ngr, err := ngrok.NewNgrok(cfg.Mod.Cmd)
+	if err != nil {
+		log.Error().Err(err).Msg("[ngrok] start")
+	}
+
+	ngr.Listen(func(msg any) {
+		if msg := msg.(*ngrok.Message); msg != nil {
+			if strings.HasPrefix(msg.Line, "ERROR:") {
+				log.Warn().Msg("[ngrok] " + msg.Line)
+			} else {
+				log.Debug().Msg("[ngrok] " + msg.Line)
+			}
+
+			// Addr: "//localhost:8555", URL: "tcp://1.tcp.eu.ngrok.io:12345"
+			if strings.HasPrefix(msg.Addr, "//localhost:") && strings.HasPrefix(msg.URL, "tcp://") {
+				// don't know if really necessary use IP
+				address, err := ConvertHostToIP(msg.URL[6:])
+				if err != nil {
+					log.Warn().Err(err).Msg("[ngrok] add candidate")
+					return
+				}
+
+				log.Info().Str("addr", address).Msg("[ngrok] add external candidate for WebRTC")
+
+				webrtc.AddCandidate("tcp", address)
+			}
+		}
+	})
+
+	go func() {
+		if err = ngr.Serve(); err != nil {
+			log.Error().Err(err).Msg("[ngrok] run")
+		}
+	}()
+
+}
+
+var log zerolog.Logger
+
+func ConvertHostToIP(address string) (string, error) {
+	host, port, err := net.SplitHostPort(address)
+	if err != nil {
+		return "", err
+	}
+
+	ip, err := net.LookupIP(host)
+	if err != nil {
+		return "", err
+	}
+
+	if len(ip) == 0 {
+		return "", fmt.Errorf("can't resolve: %s", host)
+	}
+
+	return ip[0].String() + ":" + port, nil
+}