feat: add xdai addresses (#2065)

pkg/postage/listener/listener.go

@@ -324,17 +324,24 @@ type priceUpdateEvent struct {
 }
 
 var (
+	GoerliChainID                     = int64(5)
 	GoerliPostageStampContractAddress = common.HexToAddress("0x621e455C4a139f5C4e4A8122Ce55Dc21630769E4")
 	GoerliStartBlock                  = uint64(4933174)
+	XDaiChainID                       = int64(100)
+	XDaiPostageStampContractAddress   = common.HexToAddress("0x6a1a21eca3ab28be85c7ba22b2d6eae5907c900e")
+	XDaiStartBlock                    = uint64(16515648)
 )
 
 // DiscoverAddresses returns the canonical contracts for this chainID
 func DiscoverAddresses(chainID int64) (postageStamp common.Address, startBlock uint64, found bool) {
-	if chainID == 5 {
-		// goerli
+	switch chainID {
+	case GoerliChainID:
 		return GoerliPostageStampContractAddress, GoerliStartBlock, true
-	}
+	case XDaiChainID:
+		return XDaiPostageStampContractAddress, XDaiStartBlock, true
+	default:
 		return common.Address{}, 0, false
+	}
 }
 
 func totalTimeMetric(metric prometheus.Counter, start time.Time) {

pkg/settlement/swap/chequebook/factory.go

@@ -227,13 +227,26 @@ func (c *factory) ERC20Address(ctx context.Context) (common.Address, error) {
 	return *erc20Address, nil
 }
 
+var (
+	GoerliChainID              = int64(5)
+	GoerliFactoryAddress       = common.HexToAddress("0x73c412512E1cA0be3b89b77aB3466dA6A1B9d273")
+	GoerliLegacyFactoryAddress = common.HexToAddress("0xf0277caffea72734853b834afc9892461ea18474")
+	XDaiChainID                = int64(100)
+	XDaiFactoryAddress         = common.HexToAddress("0xc2d5a532cf69aa9a1378737d8ccdef884b6e7420")
+)
+
 // DiscoverFactoryAddress returns the canonical factory for this chainID
 func DiscoverFactoryAddress(chainID int64) (currentFactory common.Address, legacyFactories []common.Address, found bool) {
-	if chainID == 5 {
+	switch chainID {
+	case GoerliChainID:
 		// goerli
-		return common.HexToAddress("0x73c412512E1cA0be3b89b77aB3466dA6A1B9d273"), []common.Address{
-			common.HexToAddress("0xf0277caffea72734853b834afc9892461ea18474"),
+		return GoerliFactoryAddress, []common.Address{
+			GoerliLegacyFactoryAddress,
 		}, true
-	}
+	case XDaiChainID:
+		// xdai
+		return XDaiFactoryAddress, []common.Address{}, true
+	default:
 		return common.Address{}, nil, false
+	}
 }

pkg/settlement/swap/priceoracle/priceoracle.go

@@ -20,7 +20,6 @@ import (
 
 var (
 	errDecodeABI = errors.New("could not decode abi data")
-	goerliContractAddress = common.HexToAddress("0x0c9de531dcb38b758fe8a2c163444a5e54ee0db2")
 )
 
 type service struct {
@@ -147,11 +146,20 @@ func (s *service) Close() error {
 	return nil
 }
 
+var (
+	goerliChainID         = int64(5)
+	goerliContractAddress = common.HexToAddress("0x0c9de531dcb38b758fe8a2c163444a5e54ee0db2")
+	xdaiChainID           = int64(100)
+	xdaiContractAddress   = common.HexToAddress("0x0FDc5429C50e2a39066D8A94F3e2D2476fcc3b85")
+)
+
 // DiscoverPriceOracleAddress returns the canonical price oracle for this chainID
 func DiscoverPriceOracleAddress(chainID int64) (priceOracleAddress common.Address, found bool) {
-	if chainID == 5 {
-		// goerli
+	switch chainID {
+	case goerliChainID:
 		return goerliContractAddress, true
+	case xdaiChainID:
+		return xdaiContractAddress, true
 	}
 	return common.Address{}, false
 }