Factor out network type ⇒ chain config lookup

node/node.go

@@ -407,13 +407,8 @@ func New(host p2p.Host, consensusObj *consensus.Consensus,
 		node.SelfPeer = host.GetSelfPeer()
 	}
 
-	chainConfig := *params.TestnetChainConfig
-	switch node.NodeConfig.GetNetworkType() {
-	case nodeconfig.Mainnet:
-		chainConfig = *params.MainnetChainConfig
-	case nodeconfig.Pangaea:
-		chainConfig = *params.PangaeaChainConfig
-	}
+	networkType := node.NodeConfig.GetNetworkType()
+	chainConfig := ChainConfigForNetworkType(networkType)
 	node.chainConfig = chainConfig
 
 	collection := shardchain.NewCollection(
@@ -457,7 +452,7 @@ func New(host p2p.Host, consensusObj *consensus.Consensus,
 		node.Consensus.SetBlockNum(blockchain.CurrentBlock().NumberU64() + 1)
 
 		// Add Faucet contract to all shards, so that on testnet, we can demo wallet in explorer
-		if node.NodeConfig.GetNetworkType() != nodeconfig.Mainnet {
+		if networkType != nodeconfig.Mainnet {
 			if node.isFirstTime {
 				// Setup one time smart contracts
 				node.AddFaucetContractToPendingTransactions()
@@ -488,6 +483,17 @@ func New(host p2p.Host, consensusObj *consensus.Consensus,
 	return &node
 }
 
+func ChainConfigForNetworkType(t nodeconfig.NetworkType) params.ChainConfig {
+	switch t {
+	case nodeconfig.Mainnet:
+		return *params.MainnetChainConfig
+	case nodeconfig.Pangaea:
+		return *params.PangaeaChainConfig
+	default:
+		return *params.TestnetChainConfig
+	}
+}
+
 // InitConsensusWithValidators initialize shard state from latest epoch and update committee pub
 // keys for consensus and drand
 func (node *Node) InitConsensusWithValidators() (err error) {