cmd, core, params: add support for Gangnam

cmd/geth/chaincmd.go

@@ -136,6 +136,7 @@ The export-preimages command export hash preimages to an RLP encoded stream`,
 			utils.FakePoWFlag,
 			utils.TestnetFlag,
 			utils.RinkebyFlag,
+			utils.GangnamFlag,
 		},
 		Category: "BLOCKCHAIN COMMANDS",
 		Description: `

cmd/geth/consolecmd.go

@@ -126,6 +126,8 @@ func remoteConsole(ctx *cli.Context) error {
 				path = filepath.Join(path, "testnet")
 			} else if ctx.GlobalBool(utils.RinkebyFlag.Name) {
 				path = filepath.Join(path, "rinkeby")
+			} else if ctx.GlobalBool(utils.GangnamFlag.Name) {
+				path = filepath.Join(path, "gangnam")
 			}
 		}
 		endpoint = fmt.Sprintf("%s/geth.ipc", path)

cmd/geth/main.go

@@ -120,6 +120,7 @@ var (
 		utils.DeveloperPeriodFlag,
 		utils.TestnetFlag,
 		utils.RinkebyFlag,
+		utils.GangnamFlag,
 		utils.VMEnableDebugFlag,
 		utils.NetworkIdFlag,
 		utils.RPCCORSDomainFlag,

cmd/geth/usage.go

@@ -74,6 +74,7 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.NetworkIdFlag,
 			utils.TestnetFlag,
 			utils.RinkebyFlag,
+			utils.GangnamFlag,
 			utils.SyncModeFlag,
 			utils.GCModeFlag,
 			utils.EthStatsURLFlag,

cmd/utils/flags.go

@@ -129,7 +129,7 @@ var (
 	}
 	NetworkIdFlag = cli.Uint64Flag{
 		Name:  "networkid",
-		Usage: "Network identifier (integer, 1=Frontier, 2=Morden (disused), 3=Ropsten, 4=Rinkeby)",
+		Usage: "Network identifier (integer, 1=Frontier, 2=Morden (disused), 3=Ropsten, 4=Rinkeby, 1204=Gangnam)",
 		Value: eth.DefaultConfig.NetworkId,
 	}
 	TestnetFlag = cli.BoolFlag{
@@ -140,6 +140,10 @@ var (
 		Name:  "rinkeby",
 		Usage: "Rinkeby network: pre-configured proof-of-authority test network",
 	}
+	GangnamFlag = cli.BoolFlag{
+		Name:  "gangnam",
+		Usage: "Gangnam network: pre-configured proof-of-work test network",
+	}
 	DeveloperFlag = cli.BoolFlag{
 		Name:  "dev",
 		Usage: "Ephemeral proof-of-authority network with a pre-funded developer account, mining enabled",
@@ -639,6 +643,9 @@ func MakeDataDir(ctx *cli.Context) string {
 		if ctx.GlobalBool(RinkebyFlag.Name) {
 			return filepath.Join(path, "rinkeby")
 		}
+		if ctx.GlobalBool(GangnamFlag.Name) {
+			return filepath.Join(path, "gangnam")
+		}
 		return path
 	}
 	Fatalf("Cannot determine default data directory, please set manually (--datadir)")
@@ -693,6 +700,8 @@ func setBootstrapNodes(ctx *cli.Context, cfg *p2p.Config) {
 		urls = params.TestnetBootnodes
 	case ctx.GlobalBool(RinkebyFlag.Name):
 		urls = params.RinkebyBootnodes
+	case ctx.GlobalBool(GangnamFlag.Name):
+		urls = params.GangnamBootnodes
 	case cfg.BootstrapNodes != nil:
 		return // already set, don't apply defaults.
 	}
@@ -720,6 +729,8 @@ func setBootstrapNodesV5(ctx *cli.Context, cfg *p2p.Config) {
 		}
 	case ctx.GlobalBool(RinkebyFlag.Name):
 		urls = params.RinkebyBootnodes
+	case ctx.GlobalBool(GangnamFlag.Name):
+		urls = params.GangnamBootnodes
 	case cfg.BootstrapNodesV5 != nil:
 		return // already set, don't apply defaults.
 	}
@@ -1001,6 +1012,8 @@ func setDataDir(ctx *cli.Context, cfg *node.Config) {
 		cfg.DataDir = filepath.Join(node.DefaultDataDir(), "testnet")
 	case ctx.GlobalBool(RinkebyFlag.Name):
 		cfg.DataDir = filepath.Join(node.DefaultDataDir(), "rinkeby")
+	case ctx.GlobalBool(GangnamFlag.Name):
+		cfg.DataDir = filepath.Join(node.DefaultDataDir(), "gangnam")
 	}
 }
 
@@ -1134,7 +1147,7 @@ func SetShhConfig(ctx *cli.Context, stack *node.Node, cfg *whisper.Config) {
 // SetEthConfig applies eth-related command line flags to the config.
 func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
 	// Avoid conflicting network flags
-	checkExclusive(ctx, DeveloperFlag, TestnetFlag, RinkebyFlag)
+	checkExclusive(ctx, DeveloperFlag, TestnetFlag, RinkebyFlag, GangnamFlag)
 	checkExclusive(ctx, LightServFlag, SyncModeFlag, "light")
 
 	ks := stack.AccountManager().Backends(keystore.KeyStoreType)[0].(*keystore.KeyStore)
@@ -1230,6 +1243,11 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
 			cfg.NetworkId = 4
 		}
 		cfg.Genesis = core.DefaultRinkebyGenesisBlock()
+	case ctx.GlobalBool(GangnamFlag.Name):
+		if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
+			cfg.NetworkId = 1204
+		}
+		cfg.Genesis = core.DefaultGangnamGenesisBlock()
 	case ctx.GlobalBool(DeveloperFlag.Name):
 		if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
 			cfg.NetworkId = 1337
@@ -1370,6 +1388,8 @@ func MakeGenesis(ctx *cli.Context) *core.Genesis {
 		genesis = core.DefaultTestnetGenesisBlock()
 	case ctx.GlobalBool(RinkebyFlag.Name):
 		genesis = core.DefaultRinkebyGenesisBlock()
+	case ctx.GlobalBool(GangnamFlag.Name):
+		genesis = core.DefaultGangnamGenesisBlock()
 	case ctx.GlobalBool(DeveloperFlag.Name):
 		Fatalf("Developer chains are ephemeral")
 	}

core/genesis.go

@@ -333,6 +333,19 @@ func DefaultRinkebyGenesisBlock() *Genesis {
 	}
 }
 
+// DefaultGangnamGenesisBlock returns the Gangnam network genesis block.
+func DefaultGangnamGenesisBlock() *Genesis {
+	return &Genesis{
+		Config:     params.GangnamChainConfig,
+		Nonce:      66,
+		Timestamp:  1543910400,
+		ExtraData:  hexutil.MustDecode("0x476f6c64656e20457468657265756d20546573746e657420303031"),
+		GasLimit:   8000000,
+		Difficulty: big.NewInt(131072),
+		Alloc:      decodePrealloc(gangnamAllocData),
+	}
+}
+
 // DeveloperGenesisBlock returns the 'geth --dev' genesis block. Note, this must
 // be seeded with the
 func DeveloperGenesisBlock(period uint64, faucet common.Address) *Genesis {

params/bootnodes.go

@@ -47,6 +47,12 @@ var RinkebyBootnodes = []string{
 	"enode://b6b28890b006743680c52e64e0d16db57f28124885595fa03a562be1d2bf0f3a1da297d56b13da25fb992888fd556d4c1a27b1f39d531bde7de1921c90061cc6@159.89.28.211:30303", // AKASHA
 }
 
+// GangnamBootnodes are the enode URLs of the P2P bootstrap nodes running on the
+// Gangnam test network.
+var GangnamBootnodes = []string{
+	"enode://0db62aeb5a7c7516dc562cbceff318cf1a28a139367c5a3e0fba100948b815e41cbcbc593bfa7ee0c473f644c8845ce676af9e99a2d48e8c31fd306c47573462@115.68.99.108:30403", // Geth Pool
+}
+
 // DiscoveryV5Bootnodes are the enode URLs of the P2P bootstrap nodes for the
 // experimental RLPx v5 topic-discovery network.
 var DiscoveryV5Bootnodes = []string{

params/config.go

@@ -28,6 +28,7 @@ var (
 	MainnetGenesisHash = common.HexToHash("0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3")
 	TestnetGenesisHash = common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d")
 	RinkebyGenesisHash = common.HexToHash("0x6341fd3daf94b748c72ced5a5b26028f2474f5f00d824504e4fa37a75767e177")
+	GangnamGenesisHash = common.HexToHash("0x16e3e67dea810effd94361c03e0d0588701dfd56fd6f4e519ee5525ad4cb9fa0")
 )
 
 var (
@@ -106,6 +107,21 @@ var (
 		BloomRoot:    common.HexToHash("0xcc401060280c2cc82697ea5ecef8cac61e52063c37533a2e9609332419704d5f"),
 	}
 
+	// GangnamChainConfig contains the chain parameters to run a node on the Gangnam test network.
+	GangnamChainConfig = &ChainConfig{
+		ChainID:             big.NewInt(1204),
+		HomesteadBlock:      big.NewInt(0),
+		DAOForkBlock:        nil,
+		DAOForkSupport:      true,
+		EIP150Block:         big.NewInt(0),
+		EIP150Hash:          common.HexToHash("0x16e3e67dea810effd94361c03e0d0588701dfd56fd6f4e519ee5525ad4cb9fa0"),
+		EIP155Block:         big.NewInt(0),
+		EIP158Block:         big.NewInt(0),
+		ByzantiumBlock:      big.NewInt(0),
+		ConstantinopleBlock: nil,
+		Ethash:              new(EthashConfig),
+	}
+
 	// AllEthashProtocolChanges contains every protocol change (EIPs) introduced
 	// and accepted by the Ethereum core developers into the Ethash consensus.
 	//