feat(go): generate unique load simulator frames

go/vehicle-gateway/internal/loadsim/runner.go

@@ -33,12 +33,13 @@ func (r Runner) Run(ctx context.Context, cfg Config) (Stats, error) {
 	}).Build(); err != nil {
 		return Stats{}, err
 	}
-	payload, err := FrameTemplate(cfg.Protocol, cfg.Template)
-	if err != nil {
-		return Stats{}, err
-	}
-	if !cfg.SendFrames {
-		payload = nil
+	var factory *FrameFactory
+	if cfg.SendFrames {
+		var err error
+		factory, err = NewFrameFactory(cfg.Protocol, cfg.Template)
+		if err != nil {
+			return Stats{}, err
+		}
 	}
 	dial := r.Dial
 	if dial == nil {
@@ -51,6 +52,7 @@ func (r Runner) Run(ctx context.Context, cfg Config) (Stats, error) {
 
 	var stats Stats
 	var wg sync.WaitGroup
+	connectionIndex := 0
 	for i, batch := range ConnectionBatches(cfg.Connections, cfg.ConnectRatePerSecond) {
 		if i > 0 {
 			if !sleepOrDone(runCtx, time.Second) {
@@ -68,11 +70,13 @@ func (r Runner) Run(ctx context.Context, cfg Config) (Stats, error) {
 			}
 			atomic.AddInt64(&stats.ConnectionsOpened, 1)
 			wg.Add(1)
+			connIndex := connectionIndex
+			connectionIndex++
 			go func() {
 				defer wg.Done()
 				defer conn.Close()
 				if cfg.SendFrames {
-					writeLoop(runCtx, conn, payload, cfg.SendInterval, &stats)
+					writeLoop(runCtx, conn, factory, connIndex, cfg.SendInterval, &stats)
 					return
 				}
 				<-runCtx.Done()
@@ -84,8 +88,13 @@ func (r Runner) Run(ctx context.Context, cfg Config) (Stats, error) {
 	return stats, nil
 }
 
-func writeLoop(ctx context.Context, conn net.Conn, payload []byte, interval time.Duration, stats *Stats) {
-	for {
+func writeLoop(ctx context.Context, conn net.Conn, factory *FrameFactory, connectionIndex int, interval time.Duration, stats *Stats) {
+	for frameIndex := int64(0); ; frameIndex++ {
+		payload, err := factory.Frame(connectionIndex, frameIndex)
+		if err != nil {
+			atomic.AddInt64(&stats.WriteErrors, 1)
+			return
+		}
 		_ = conn.SetWriteDeadline(time.Now().Add(3 * time.Second))
 		if _, err := conn.Write(payload); err != nil {
 			atomic.AddInt64(&stats.WriteErrors, 1)