From 2f97c8db4b36c06605cfde245e1d32075017b20a Mon Sep 17 00:00:00 2001
From: zgaetano <zgaetano@wilddragon.net>
Date: Tue, 31 Mar 2026 15:29:57 -0400
Subject: [PATCH] Add backend/cmd/moonrelay/main.go

---
 backend/cmd/moonrelay/main.go | 114 ++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 backend/cmd/moonrelay/main.go

diff --git a/backend/cmd/moonrelay/main.go b/backend/cmd/moonrelay/main.go
new file mode 100644
index 0000000..366860c
--- /dev/null
+++ b/backend/cmd/moonrelay/main.go
@@ -0,0 +1,114 @@
+// moonrelay — self-hosted streaming manager backend.
+//
+// In Docker mode the React SPA is embedded at build time via go:embed.
+// Set MOONRELAY_NO_EMBED=1 to skip the SPA (API-only / dev mode).
+//
+// Environment variables:
+//   MOONRELAY_PORT    - HTTP listen port         (default: 8080)
+//   MOONRELAY_HOST    - HTTP listen address       (default: 0.0.0.0)
+//   TS_AUTHKEY        - Tailscale auth key (optional; prompts login if unset)
+//   TS_HOSTNAME       - Tailscale device hostname (default: moonrelay)
+//   MOONLIGHT_PATH    - Override path to moonlight binary
+//   MOONRELAY_NO_TS   - Set "1" to disable Tailscale (LAN-only)
+package main
+
+import (
+	"context"
+	"embed"
+	"fmt"
+	"io/fs"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"moonrelay/internal/api"
+	"moonrelay/internal/discovery"
+	"moonrelay/internal/moonlight"
+	tsnode "moonrelay/internal/tailscale"
+)
+
+// ui holds the React production build, copied here by the Dockerfile
+// before `go build`. The path must match where the build output lands.
+//
+//go:embed ui
+var uiFiles embed.FS
+
+func main() {
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer cancel()
+
+	port := env("MOONRELAY_PORT", "8080")
+	host := env("MOONRELAY_HOST", "0.0.0.0")
+	noTS := os.Getenv("MOONRELAY_NO_TS") == "1"
+
+	// --- Moonlight launcher ---
+	launcher, err := moonlight.New(os.Getenv("MOONLIGHT_PATH"))
+	if err != nil {
+		log.Printf("Warning: %v", err)
+		launcher, _ = moonlight.New("")
+	}
+
+	// --- mDNS discovery ---
+	disc := discovery.New()
+	go disc.Run(ctx)
+
+	// --- Tailscale node (optional) ---
+	var ts *tsnode.Node
+	if !noTS {
+		log.Println("Starting embedded Tailscale node…")
+		ts, err = tsnode.New(ctx, tsnode.Config{
+			Hostname: env("TS_HOSTNAME", "moonrelay"),
+			AuthKey:  os.Getenv("TS_AUTHKEY"),
+		})
+		if err != nil {
+			log.Printf("Warning: Tailscale failed to start (%v) — running in LAN-only mode", err)
+			ts = nil
+		} else {
+			if addr := ts.LocalAddr(); addr != "" {
+				log.Printf("Tailscale connected: %s", addr)
+			} else {
+				log.Println("Tailscale: waiting for auth (check logs for login URL)")
+			}
+		}
+	}
+
+	// --- Embedded SPA ---
+	// Strip the "ui/" prefix so the FS root contains index.html directly.
+	uiRoot, err := fs.Sub(uiFiles, "ui")
+	if err != nil {
+		log.Fatalf("Failed to access embedded UI: %v", err)
+	}
+
+	// --- HTTP server ---
+	srv := api.New(disc, launcher, ts, uiRoot)
+	addr := fmt.Sprintf("%s:%s", host, port)
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		log.Fatalf("Cannot listen on %s: %v", addr, err)
+	}
+	log.Printf("Moonlight Relay listening on http://%s", addr)
+
+	httpSrv := &http.Server{Handler: srv.Handler()}
+	go func() {
+		if err := httpSrv.Serve(ln); err != nil && err != http.ErrServerClosed {
+			log.Printf("HTTP server error: %v", err)
+		}
+	}()
+
+	<-ctx.Done()
+	log.Println("Shutting down…")
+	_ = httpSrv.Close()
+	if ts != nil {
+		_ = ts.Close()
+	}
+}
+
+func env(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}