Implemented epics read/write

cmd/uopi/main.go

@@ -59,19 +59,21 @@ func main() {
 
 	brk := broker.New(ctx, log)
 
-	// Stub data source is always registered — it provides synthetic test signals
-	// used by demo interfaces and unit tests.
-	stubDS := stub.New()
-	if err := stubDS.Connect(ctx); err != nil {
-		log.Error("stub connect", "err", err)
-		os.Exit(1)
+	// Stub data source: built-in simulated signals (sine, ramp, noise, setpoint).
+	// Enabled by default; disable via [datasource.stub] enabled = false in config.
+	if cfg.Datasource.Stub.Enabled {
+		stubDS := stub.New()
+		if err := stubDS.Connect(ctx); err != nil {
+			log.Error("stub connect", "err", err)
+			os.Exit(1)
+		}
+		brk.Register(stubDS)
 	}
-	brk.Register(stubDS)
 
 	// Synthetic data source: computes derived signals from upstream sources via
 	// configurable DSP pipelines defined in synthetic.json inside the storage dir.
 	var synthDS *synthetic.Synthetic
-	if cfg.Synthetic.Enabled {
+	if cfg.Datasource.Synthetic.Enabled {
 		synthDS = synthetic.New(cfg.Server.StorageDir, brk, log)
 		if err := synthDS.Connect(ctx); err != nil {
 			log.Warn("synthetic connect failed — continuing without synthetic signals", "err", err)
@@ -83,8 +85,8 @@ func main() {
 
 	// EPICS Channel Access data source (requires -tags epics build).
 	// epics.Available() returns false when built without the tag.
-	if cfg.EPICS.Enabled && epics.Available() {
-		ds := epics.New(cfg.EPICS.CAAddrList, cfg.EPICS.ArchiveURL)
+	if cfg.Datasource.EPICS.Enabled && epics.Available() {
+		ds := epics.New(cfg.Datasource.EPICS.CAAddrList, cfg.Datasource.EPICS.ArchiveURL)
 		if err := ds.Connect(ctx); err != nil {
 			log.Error("epics connect", "err", err)
 		} else {
@@ -92,7 +94,7 @@ func main() {
 		}
 	}
 
-	srv := server.New(cfg.Server.Listen, webFS, brk, synthDS, store, cfg.EPICS.ChannelFinderURL, log)
+	srv := server.New(cfg.Server.Listen, webFS, brk, synthDS, store, cfg.Datasource.EPICS.ChannelFinderURL, log)
 
 	if err := srv.Start(ctx); err != nil {
 		fmt.Fprintf(os.Stderr, "server error: %v\n", err)