node: add Binance Smart Chain support

BSC is identical to Eth, so we can just re-use our Eth devnet.

Fixes certusone/wormhole#185

Change-Id: Ib96a71b5e5873d7cbd8f26dbb655049c6a64cef9

bridge/cmd/guardiand/bridge.go

@@ -57,6 +57,9 @@ var (
 	ethRPC      *string
 	ethContract *string
 
+	bscRPC      *string
+	bscContract *string
+
 	terraWS       *string
 	terraLCD      *string
 	terraChainID  *string
@@ -93,6 +96,9 @@ func init() {
 	ethRPC = BridgeCmd.Flags().String("ethRPC", "", "Ethereum RPC URL")
 	ethContract = BridgeCmd.Flags().String("ethContract", "", "Ethereum bridge contract address")
 
+	bscRPC = BridgeCmd.Flags().String("bscRPC", "", "Binance Smart Chain RPC URL")
+	bscContract = BridgeCmd.Flags().String("bscContract", "", "Binance Smart Chain bridge contract address")
+
 	terraWS = BridgeCmd.Flags().String("terraWS", "", "Path to terrad root for websocket connection")
 	terraLCD = BridgeCmd.Flags().String("terraLCD", "", "Path to LCD service root for http calls")
 	terraChainID = BridgeCmd.Flags().String("terraChainID", "", "Terra chain ID, used in LCD client initialization")
@@ -231,6 +237,7 @@ func runBridge(cmd *cobra.Command, args []string) {
 
 		// Deterministic ganache ETH devnet address.
 		*ethContract = devnet.GanacheBridgeContractAddress.Hex()
+		*bscContract = devnet.GanacheBridgeContractAddress.Hex()
 
 		// Use the hostname as nodeName. For production, we don't want to do this to
 		// prevent accidentally leaking sensitive hostnames.
@@ -261,6 +268,12 @@ func runBridge(cmd *cobra.Command, args []string) {
 	if *ethContract == "" {
 		logger.Fatal("Please specify --ethContract")
 	}
+	if *bscRPC == "" {
+		logger.Fatal("Please specify --bscRPC")
+	}
+	if *bscContract == "" {
+		logger.Fatal("Please specify --bscContract")
+	}
 	if *nodeName == "" {
 		logger.Fatal("Please specify --nodeName")
 	}
@@ -289,6 +302,7 @@ func runBridge(cmd *cobra.Command, args []string) {
 	}
 
 	ethContractAddr := eth_common.HexToAddress(*ethContract)
+	bscContractAddr := eth_common.HexToAddress(*bscContract)
 	solBridgeAddress, err := solana_types.PublicKeyFromBase58(*solanaBridgeAddress)
 	if err != nil {
 		logger.Fatal("invalid Solana bridge address", zap.Error(err))
@@ -378,6 +392,11 @@ func runBridge(cmd *cobra.Command, args []string) {
 			return err
 		}
 
+		if err := supervisor.Run(ctx, "bscwatch",
+			ethereum.NewEthBridgeWatcher(*bscRPC, bscContractAddr, "bsc", vaa.ChainIDBSC, lockC, nil).Run); err != nil {
+			return err
+		}
+
 		// Start Terra watcher only if configured
 		logger.Info("Starting Terra watcher")
 		if err := supervisor.Run(ctx, "terrawatch",

bridge/pkg/vaa/structs.go

@@ -69,6 +69,8 @@ func (c ChainID) String() string {
 		return "ethereum"
 	case ChainIDTerra:
 		return "terra"
+	case ChainIDBSC:
+		return "bsc"
 	default:
 		return fmt.Sprintf("unknown chain ID: %d", c)
 	}
@@ -81,6 +83,8 @@ const (
 	ChainIDEthereum = 2
 	// ChainIDTerra is the ChainID of Terra
 	ChainIDTerra = 3
+	// ChainIDBSC is the ChainID of Binance Smart Chain
+	ChainIDBSC = 4
 
 	minVAALength        = 1 + 4 + 52 + 4 + 1 + 1
 	SupportedVAAVersion = 0x01

devnet/bridge.yaml

@@ -63,6 +63,8 @@ spec:
             - bridge
             - --ethRPC
             - ws://eth-devnet:8545
+            - --bscRPC
+            - ws://eth-devnet:8545
             - --terraWS
             - ws://terra-terrad:26657/websocket
             - --terraLCD