add limit and rate for chain noise

cmd/chain-noise/main.go

@@ -27,6 +27,16 @@ func main() {
 				Hidden:  true,
 				Value:   "~/.lotus", // TODO: Consider XDG_DATA_HOME
 			},
+			&cli.IntFlag{
+				Name:    "limit",
+				Usage:   "spam transaction count limit, <= 0 is no limit",
+				Value:   0,
+			},
+			&cli.IntFlag{
+				Name:    "rate",
+				Usage:   "spam transaction rate, count per second",
+				Value:   5,
+			},
 		},
 		Commands: []*cli.Command{runCmd},
 	}
@@ -52,11 +62,17 @@ var runCmd = &cli.Command{
 		defer closer()
 		ctx := lcli.ReqContext(cctx)
 
-		return sendSmallFundsTxs(ctx, api, addr, 5)
+		rate := cctx.Int("rate")
+		if rate <= 0 {
+			rate = 5
+		}
+		limit := cctx.Int("limit")
+
+		return sendSmallFundsTxs(ctx, api, addr, rate, limit)
 	},
 }
 
-func sendSmallFundsTxs(ctx context.Context, api api.FullNode, from address.Address, rate int) error {
+func sendSmallFundsTxs(ctx context.Context, api api.FullNode, from address.Address, rate, limit int) error {
 	var sendSet []address.Address
 	for i := 0; i < 20; i++ {
 		naddr, err := api.WalletNew(ctx, types.KTSecp256k1)
@@ -66,9 +82,14 @@ func sendSmallFundsTxs(ctx context.Context, api api.FullNode, from address.Addre
 
 		sendSet = append(sendSet, naddr)
 	}
+	count := limit
 
 	tick := build.Clock.Ticker(time.Second / time.Duration(rate))
 	for {
+		if count <= 0 && limit > 0 {
+			fmt.Printf("%d messages sent.\n", limit)
+			return nil
+		}
 		select {
 		case <-tick.C:
 			msg := &types.Message{
@@ -81,6 +102,7 @@ func sendSmallFundsTxs(ctx context.Context, api api.FullNode, from address.Addre
 			if err != nil {
 				return err
 			}
+			count--
 			fmt.Println("Message sent: ", smsg.Cid())
 		case <-ctx.Done():
 			return nil