From dcdb7059cc69ee4e77518b8dd92d5c7037aa3c8d Mon Sep 17 00:00:00 2001
From: Jeffrey Wilcke <geffobscura@gmail.com>
Date: Mon, 3 Aug 2015 17:48:24 +0200
Subject: [PATCH] cmd, core, eth: support for the olympic network

Added a --olympic flag which initialiser the olympic protocol settings
---
 cmd/geth/main.go   |  4 ++++
 cmd/utils/cmd.go   | 17 +++++++++++++++++
 cmd/utils/flags.go | 12 ++++++++++++
 eth/backend.go     |  9 +++++++++
 4 files changed, 42 insertions(+)

diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index 68a2c79e2..511e0df9d 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -280,6 +280,7 @@ JavaScript API. See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Conso
 		utils.BootnodesFlag,
 		utils.DataDirFlag,
 		utils.BlockchainVersionFlag,
+		utils.OlympicFlag,
 		utils.CacheFlag,
 		utils.JSpathFlag,
 		utils.ListenPortFlag,
@@ -346,6 +347,9 @@ func main() {
 
 func run(ctx *cli.Context) {
 	utils.CheckLegalese(ctx.GlobalString(utils.DataDirFlag.Name))
+	if ctx.GlobalBool(utils.OlympicFlag.Name) {
+		utils.InitOlympic()
+	}
 
 	cfg := utils.MakeEthConfig(ClientIdentifier, nodeNameVersion, ctx)
 	ethereum, err := eth.New(cfg)
diff --git a/cmd/utils/cmd.go b/cmd/utils/cmd.go
index d9c4b6da5..f8f7f6376 100644
--- a/cmd/utils/cmd.go
+++ b/cmd/utils/cmd.go
@@ -21,6 +21,7 @@ import (
 	"bufio"
 	"fmt"
 	"io"
+	"math/big"
 	"os"
 	"os/signal"
 	"regexp"
@@ -32,6 +33,7 @@ import (
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/peterh/liner"
 )
@@ -143,6 +145,15 @@ func StartEthereum(ethereum *eth.Ethereum) {
 	}()
 }
 
+func InitOlympic() {
+	params.DurationLimit = big.NewInt(8)
+	params.GenesisGasLimit = big.NewInt(3141592)
+	params.MinGasLimit = big.NewInt(125000)
+	params.MaximumExtraDataSize = big.NewInt(1024)
+	NetworkIdFlag.Value = 0
+	core.BlockReward = big.NewInt(1.5e+18)
+}
+
 func FormatTransactionData(data string) []byte {
 	d := common.StringToByteFunc(data, func(s string) (ret []byte) {
 		slice := regexp.MustCompile("\\n|\\s").Split(s, 1000000000)
@@ -203,6 +214,11 @@ func ImportChain(chain *core.ChainManager, fn string) error {
 			} else if err != nil {
 				return fmt.Errorf("at block %d: %v", n, err)
 			}
+			// don't import first block
+			if b.NumberU64() == 0 {
+				i--
+				continue
+			}
 			blocks[i] = &b
 			n++
 		}
@@ -218,6 +234,7 @@ func ImportChain(chain *core.ChainManager, fn string) error {
 				batch, blocks[0].Hash().Bytes()[:4], blocks[i-1].Hash().Bytes()[:4])
 			continue
 		}
+
 		if _, err := chain.InsertChain(blocks[:i]); err != nil {
 			return fmt.Errorf("invalid block %d: %v", n, err)
 		}
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index b66fe24cc..d283329f1 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -131,6 +131,10 @@ var (
 		Usage: "Megabytes of memory allocated to internal caching",
 		Value: 0,
 	}
+	OlympicFlag = cli.BoolFlag{
+		Name:  "olympic",
+		Usage: "Use olympic style protocol",
+	}
 
 	// miner settings
 	MinerThreadsFlag = cli.IntFlag{
@@ -402,6 +406,7 @@ func MakeEthConfig(clientID, version string, ctx *cli.Context) *eth.Config {
 		MaxPeers:                ctx.GlobalInt(MaxPeersFlag.Name),
 		MaxPendingPeers:         ctx.GlobalInt(MaxPendingPeersFlag.Name),
 		Port:                    ctx.GlobalString(ListenPortFlag.Name),
+		Olympic:                 ctx.GlobalBool(OlympicFlag.Name),
 		NAT:                     MakeNAT(ctx),
 		NatSpec:                 ctx.GlobalBool(NatspecEnabledFlag.Name),
 		Discovery:               !ctx.GlobalBool(NoDiscoverFlag.Name),
@@ -444,6 +449,13 @@ func MakeChain(ctx *cli.Context) (chain *core.ChainManager, blockDB, stateDB, ex
 	if extraDB, err = ethdb.NewLDBDatabase(filepath.Join(datadir, "extra"), cache); err != nil {
 		Fatalf("Could not open database: %v", err)
 	}
+	if ctx.GlobalBool(OlympicFlag.Name) {
+		InitOlympic()
+		_, err := core.WriteTestNetGenesisBlock(stateDB, blockDB, 42)
+		if err != nil {
+			glog.Fatalln(err)
+		}
+	}
 
 	eventMux := new(event.TypeMux)
 	pow := ethash.New()
diff --git a/eth/backend.go b/eth/backend.go
index bed6231ed..4795000e0 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -78,6 +78,7 @@ type Config struct {
 	GenesisNonce int
 	GenesisFile  string
 	GenesisBlock *types.Block // used by block tests
+	Olympic      bool
 
 	BlockChainVersion  int
 	SkipBcVersionCheck bool // e.g. blockchain export
@@ -302,6 +303,14 @@ func New(config *Config) (*Ethereum, error) {
 		glog.V(logger.Info).Infof("Successfully wrote genesis block. New genesis hash = %x\n", block.Hash())
 	}
 
+	if config.Olympic {
+		_, err := core.WriteTestNetGenesisBlock(stateDb, blockDb, 42)
+		if err != nil {
+			return nil, err
+		}
+		glog.V(logger.Error).Infoln("Starting Olympic network")
+	}
+
 	// This is for testing only.
 	if config.GenesisBlock != nil {
 		core.WriteBlock(blockDb, config.GenesisBlock)