add configuration for goerli (#736)

pkg/node/node.go

@@ -175,15 +175,22 @@ func NewBee(addr string, swarmAddress swarm.Address, keystore keystore.Service,
 			return nil, err
 		}
 
-		// TODO: factory address discovery for well-known networks (goerli for beta)
-
+		var factoryAddress common.Address
 		if o.SwapFactoryAddress == "" {
-			return nil, errors.New("no known factory address")
+			var found bool
+			factoryAddress, found = chequebook.DiscoverFactoryAddress(chainID.Int64())
+			if !found {
+				return nil, errors.New("no known factory address")
+			}
+			logger.Infof("using default factory address for chain id %d: %x", chainID, factoryAddress)
 		} else if !common.IsHexAddress(o.SwapFactoryAddress) {
 			return nil, errors.New("invalid factory address")
+		} else {
+			factoryAddress = common.HexToAddress(o.SwapFactoryAddress)
+			logger.Infof("using custom factory address: %x", factoryAddress)
 		}
 
-		chequebookFactory, err := chequebook.NewFactory(swapBackend, transactionService, common.HexToAddress(o.SwapFactoryAddress), chequebook.NewSimpleSwapFactoryBindingFunc)
+		chequebookFactory, err := chequebook.NewFactory(swapBackend, transactionService, factoryAddress, chequebook.NewSimpleSwapFactoryBindingFunc)
 		if err != nil {
 			return nil, err
 		}

pkg/settlement/swap/chequebook/factory.go

@@ -156,3 +156,12 @@ func (c *factory) ERC20Address(ctx context.Context) (common.Address, error) {
 	}
 	return erc20Address, nil
 }
+
+// DiscoverFactoryAddress returns the canonical factory for this chainID
+func DiscoverFactoryAddress(chainID int64) (common.Address, bool) {
+	if chainID == 5 {
+		// goerli
+		return common.HexToAddress("0x334394E8c891E77b1449084aaDD659920BB25247"), true
+	}
+	return common.Address{}, false
+}