configure playback retry attempts

cmd/mxl-player/main.go

@@ -34,6 +34,11 @@ const (
 	placeholderStride uint32 = 4
 )
 
+const (
+	initialRetryDelay = 500 * time.Millisecond
+	maxRetryDelay     = 5 * time.Second
+)
+
 type appArgs struct {
 	ShowHelp      bool
 	Domain        string
@@ -53,7 +58,7 @@ type appArgs struct {
 
 func printCliHelp(fs *pflag.FlagSet) {
 	fmt.Printf("%s %s\n", APP_NAME, APP_VER)
-	fmt.Println("Usage: mxl-player -d <domain> (-v <uuid> | -a <uuid>) [-f] [-h]")
+	fmt.Println("Usage: mxl-player -d <domain> (-v <uuid> | -a <uuid>) [--max-attempts <count>] [-f] [-h]")
 	fmt.Println("                  [-g <gpu-id>] [-p <playback-id>] [--verbose]")
 	fmt.Println("   or: mxl-player [--list-playback] [--list-gpu]")
 	fmt.Println("   or: mxl-player (and set everything in GUI)")
@@ -94,11 +99,18 @@ func main() {
 	// f1 audio: 5fbec3b1-1b0f-417d-9059-8b94a47197eb
 	var args appArgs
 	flagSet := pflag.NewFlagSet(APP_NAME, pflag.ContinueOnError)
+	flagSet.SortFlags = false
 	flagSet.Usage = func() { printUsage(os.Stderr) }
 	flagSet.BoolVarP(&args.ShowHelp, "help", "h", false, "Show help message and exit")
 	flagSet.StringVarP(&args.Domain, "domain", "d", "", "MXL domain directory")
 	flagSet.StringVarP(&args.VideoFlowId, "video", "v", "", "Video flow UUID")
 	flagSet.StringVarP(&args.AudioFlowId, "audio", "a", "", "Audio flow UUID")
+	flagSet.IntVar(
+		&args.MaxAttempts,
+		"max-attempts",
+		0,
+		"Maximum connection attempts per playback lifecycle; 0 retries indefinitely",
+	)
 	flagSet.BoolVarP(&args.IsFullscreen, "fullscreen", "f", false, "Run app in fullscreen mode")
 	flagSet.Uint32VarP(&args.GpuId, "gpu-id", "g", 0, "GPU id [TODO]")
 	flagSet.Uint32VarP(&args.PlaybackId, "playback-id", "p", 0, "Playback audio device id")
@@ -115,6 +127,20 @@ func main() {
 		printCliHelp(flagSet)
 		return
 	}
+	if args.MaxAttempts < 0 {
+		fmt.Fprintln(os.Stderr, "--max-attempts cannot be negative")
+		printUsage(os.Stderr)
+		os.Exit(2)
+	}
+	retryPolicy := playback.RetryPolicy{
+		MaxAttempts:  args.MaxAttempts,
+		InitialDelay: initialRetryDelay,
+		MaxDelay:     maxRetryDelay,
+	}
+	if err := retryPolicy.Validate(); err != nil {
+		fmt.Fprintln(os.Stderr, "invalid retry configuration:", err)
+		os.Exit(2)
+	}
 	if !args.ListAudio && !args.ListGPU {
 		checkMXLargs(args)
 	}