refactor: add -gateway and deprecate -broadcaster (#3053)

* refactor: add -gateway and deprecate -broadcaster

This commit adds the `gateway` flag and deprecates the `broadcaster` flag
per core team decision (details:
https://discord.com/channels/423160867534929930/1051963444598943784/1210356864643109004).

* chore: update pending changelog

---------

Co-authored-by: John | Elite Encoder <john@eliteencoder.net>

CHANGELOG_PENDING.md

@@ -2,6 +2,8 @@
 
 ## vX.X
 
+- [#3053](https://github.com/livepeer/go-livepeer/pull/3053) cli: add `-gateway` flag and deprecate `-broadcaster` flag.
+
 ### Breaking Changes 🚨🚨
 
 ### Features ⚒

cmd/livepeer/livepeer.go

@@ -140,7 +140,8 @@ func parseLivepeerConfig() starter.LivepeerConfig {
 	// Transcoding:
 	cfg.Orchestrator = flag.Bool("orchestrator", *cfg.Orchestrator, "Set to true to be an orchestrator")
 	cfg.Transcoder = flag.Bool("transcoder", *cfg.Transcoder, "Set to true to be a transcoder")
-	cfg.Broadcaster = flag.Bool("broadcaster", *cfg.Broadcaster, "Set to true to be a broadcaster")
+	cfg.Gateway = flag.Bool("gateway", *cfg.Broadcaster, "Set to true to be a gateway")
+	cfg.Broadcaster = flag.Bool("broadcaster", *cfg.Broadcaster, "Set to true to be a broadcaster (**Deprecated**, use -gateway)")
 	cfg.OrchSecret = flag.String("orchSecret", *cfg.OrchSecret, "Shared secret with the orchestrator as a standalone transcoder or path to file")
 	cfg.TranscodingOptions = flag.String("transcodingOptions", *cfg.TranscodingOptions, "Transcoding options for broadcast job, or path to json config")
 	cfg.MaxAttempts = flag.Int("maxAttempts", *cfg.MaxAttempts, "Maximum transcode attempts")

cmd/livepeer/starter/starter.go

@@ -87,6 +87,7 @@ type LivepeerConfig struct {
 	HttpIngest              *bool
 	Orchestrator            *bool
 	Transcoder              *bool
+	Gateway                 *bool
 	Broadcaster             *bool
 	OrchSecret              *string
 	TranscodingOptions      *string
@@ -164,6 +165,7 @@ func DefaultLivepeerConfig() LivepeerConfig {
 	defaultOrchestrator := false
 	defaultTranscoder := false
 	defaultBroadcaster := false
+	defaultGateway := false
 	defaultOrchSecret := ""
 	defaultTranscodingOptions := "P240p30fps16x9,P360p30fps16x9"
 	defaultMaxAttempts := 3
@@ -250,6 +252,7 @@ func DefaultLivepeerConfig() LivepeerConfig {
 		// Transcoding:
 		Orchestrator:         &defaultOrchestrator,
 		Transcoder:           &defaultTranscoder,
+		Gateway:              &defaultGateway,
 		Broadcaster:          &defaultBroadcaster,
 		OrchSecret:           &defaultOrchSecret,
 		TranscodingOptions:   &defaultTranscodingOptions,
@@ -501,6 +504,9 @@ func StartLivepeer(ctx context.Context, cfg LivepeerConfig) {
 		n.NodeType = core.TranscoderNode
 	} else if *cfg.Broadcaster {
 		n.NodeType = core.BroadcasterNode
+		glog.Warning("-broadcaster flag is deprecated and will be removed in a future release. Please use -gateway instead")
+	} else if *cfg.Gateway {
+		n.NodeType = core.BroadcasterNode
 	} else if (cfg.Reward == nil || !*cfg.Reward) && !*cfg.InitializeRound {
 		exit("No services enabled; must be at least one of -broadcaster, -transcoder, -orchestrator, -redeemer, -reward or -initializeRound")
 	}
@@ -1273,7 +1279,7 @@ func StartLivepeer(ctx context.Context, cfg LivepeerConfig) {
 	case core.OrchestratorNode:
 		glog.Infof("***Livepeer Running in Orchestrator Mode***")
 	case core.BroadcasterNode:
-		glog.Infof("***Livepeer Running in Broadcaster Mode***")
+		glog.Infof("***Livepeer Running in Gateway Mode***")
 		glog.Infof("Video Ingest Endpoint - rtmp://%v", *cfg.RtmpAddr)
 	case core.TranscoderNode:
 		glog.Infof("**Liveepeer Running in Transcoder Mode***")