Add minimal Web UI server

cmd/yggdrasil/main.go

@@ -25,6 +25,7 @@ import (
 	"github.com/yggdrasil-network/yggdrasil-go/src/admin"
 	"github.com/yggdrasil-network/yggdrasil-go/src/config"
 	"github.com/yggdrasil-network/yggdrasil-go/src/ipv6rwc"
+	"github.com/yggdrasil-network/yggdrasil-go/src/webui"
 
 	"github.com/yggdrasil-network/yggdrasil-go/src/core"
 	"github.com/yggdrasil-network/yggdrasil-go/src/multicast"
@@ -37,6 +38,7 @@ type node struct {
 	tun       *tun.TunAdapter
 	multicast *multicast.Multicast
 	admin     *admin.AdminSocket
+	webui     *webui.WebUIServer
 }
 
 // The main function is responsible for configuring and starting Yggdrasil.
@@ -69,6 +71,7 @@ func main() {
 	getpkey := flag.Bool("publickey", false, "use in combination with either -useconf or -useconffile, outputs your public key")
 	loglevel := flag.String("loglevel", "info", "loglevel to enable")
 	chuserto := flag.String("user", "", "user (and, optionally, group) to set UID/GID to")
+
 	flag.Parse()
 
 	done := make(chan struct{})
@@ -261,6 +264,23 @@ func main() {
 		}
 	}
 
+	// Set up the web UI server if enabled in config.
+	if cfg.WebUI.Enable {
+		var listenAddr string
+		if cfg.WebUI.Host == "" {
+			listenAddr = fmt.Sprintf(":%d", cfg.WebUI.Port)
+		} else {
+			listenAddr = fmt.Sprintf("%s:%d", cfg.WebUI.Host, cfg.WebUI.Port)
+		}
+
+		n.webui = webui.Server(listenAddr, logger)
+		go func() {
+			if err := n.webui.Start(); err != nil {
+				logger.Errorf("WebUI server error: %v", err)
+			}
+		}()
+	}
+
 	// Set up the multicast module.
 	{
 		options := []multicast.SetupOption{}
@@ -334,6 +354,9 @@ func main() {
 	_ = n.admin.Stop()
 	_ = n.multicast.Stop()
 	_ = n.tun.Stop()
+	if n.webui != nil {
+		_ = n.webui.Stop()
+	}
 	n.core.Stop()
 }