core: added basic chain configuration

Added chain configuration options and write out during genesis database
insertion. If no "config" was found, nothing is written to the database.

Configurations are written on a per genesis base. This means
that any chain (which is identified by it's genesis hash) can have their
own chain settings.

6 files changed, 108 insertions, 32 deletions

diff --git a/cmd/ethtest/main.go b/cmd/ethtest/main.go
index e19dca86b..3916e297f 100644
--- a/cmd/ethtest/main.go
+++ b/cmd/ethtest/main.go
@@ -27,6 +27,7 @@ import (
 
 	"github.com/codegangsta/cli"
 	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/tests"
 )
 
@@ -73,9 +74,9 @@ func runTestWithReader(test string, r io.Reader) error {
 	var err error
 	switch strings.ToLower(test) {
 	case "bk", "block", "blocktest", "blockchaintest", "blocktests", "blockchaintests":
-		err = tests.RunBlockTestWithReader(r, skipTests)
+		err = tests.RunBlockTestWithReader(params.MainNetHomesteadBlock, r, skipTests)
 	case "st", "state", "statetest", "statetests":
-		err = tests.RunStateTestWithReader(r, skipTests)
+		err = tests.RunStateTestWithReader(tests.RuleSet{params.MainNetHomesteadBlock}, r, skipTests)
 	case "tx", "transactiontest", "transactiontests":
 		err = tests.RunTransactionTestsWithReader(r, skipTests)
 	case "vm", "vmtest", "vmtests":
diff --git a/cmd/evm/main.go b/cmd/evm/main.go
index 2cc70d81b..7d9b3a6c3 100644
--- a/cmd/evm/main.go
+++ b/cmd/evm/main.go
@@ -33,7 +33,6 @@ import (
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/logger/glog"
-	"github.com/ethereum/go-ethereum/params"
 )
 
 var (
@@ -106,9 +105,6 @@ func init() {
 }
 
 func run(ctx *cli.Context) {
-	vm.ForceJit = ctx.GlobalBool(ForceJitFlag.Name)
-	vm.EnableJit = !ctx.GlobalBool(DisableJitFlag.Name)
-
 	glog.SetToStderr(true)
 	glog.SetV(ctx.GlobalInt(VerbosityFlag.Name))
 
@@ -118,8 +114,10 @@ func run(ctx *cli.Context) {
 	receiver := statedb.CreateAccount(common.StringToAddress("receiver"))
 	receiver.SetCode(common.Hex2Bytes(ctx.GlobalString(CodeFlag.Name)))
 
-	vmenv := NewEnv(statedb, common.StringToAddress("evmuser"), common.Big(ctx.GlobalString(ValueFlag.Name)), &vm.Config{
-		Debug: ctx.GlobalBool(DebugFlag.Name),
+	vmenv := NewEnv(statedb, common.StringToAddress("evmuser"), common.Big(ctx.GlobalString(ValueFlag.Name)), vm.Config{
+		Debug:     ctx.GlobalBool(DebugFlag.Name),
+		ForceJit:  ctx.GlobalBool(ForceJitFlag.Name),
+		EnableJit: !ctx.GlobalBool(DisableJitFlag.Name),
 	})
 
 	tstart := time.Now()
@@ -180,8 +178,7 @@ type VMEnv struct {
 	evm *vm.EVM
 }
 
-func NewEnv(state *state.StateDB, transactor common.Address, value *big.Int, cfg *vm.Config) *VMEnv {
-	params.HomesteadBlock = new(big.Int)
+func NewEnv(state *state.StateDB, transactor common.Address, value *big.Int, cfg vm.Config) *VMEnv {
 	env := &VMEnv{
 		state:      state,
 		transactor: &transactor,
@@ -194,6 +191,12 @@ func NewEnv(state *state.StateDB, transactor common.Address, value *big.Int, cfg
 	return env
 }
 
+// ruleSet implements vm.RuleSet and will always default to the homestead rule set.
+type ruleSet struct{}
+
+func (ruleSet) IsHomestead(*big.Int) bool { return true }
+
+func (self *VMEnv) RuleSet() vm.RuleSet        { return ruleSet{} }
 func (self *VMEnv) Vm() vm.Vm                  { return self.evm }
 func (self *VMEnv) Db() vm.Database            { return self.state }
 func (self *VMEnv) MakeSnapshot() vm.Database  { return self.state.Copy() }
diff --git a/cmd/geth/js_test.go b/cmd/geth/js_test.go
index af435e68c..e0c4dacbc 100644
--- a/cmd/geth/js_test.go
+++ b/cmd/geth/js_test.go
@@ -106,6 +106,7 @@ func testREPL(t *testing.T, config func(*eth.Config)) (string, *testjethre, *nod
 	core.WriteGenesisBlockForTesting(db, core.GenesisAccount{common.HexToAddress(testAddress), common.String2Big(testBalance)})
 
 	ethConf := &eth.Config{
+		ChainConfig:      &core.ChainConfig{HomesteadBlock: new(big.Int)},
 		TestGenesisState: db,
 		AccountManager:   accman,
 		DocRoot:          "/",
diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index a21fe71b5..5d5ab4559 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -32,7 +32,9 @@ import (
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/eth"
+	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/internal/debug"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
@@ -108,7 +110,6 @@ Runs quick benchmark on first GPU found.
 The output of this command is supposed to be machine-readable.
 `,
 		},
-
 		{
 			Name:  "wallet",
 			Usage: "ethereum presale wallet",
@@ -248,6 +249,16 @@ nodes.
 			},
 		},
 		{
+			Action: initGenesis,
+			Name:   "init",
+			Usage:  "bootstraps and initialises a new genesis block (JSON)",
+			Description: `
+The init command initialises a new genesis block and definition for the network.
+This is a destructive action and changes the network in which you will be
+participating.
+`,
+		},
+		{
 			Action: console,
 			Name:   "console",
 			Usage:  `Geth Console: interactive JavaScript environment`,
@@ -255,7 +266,8 @@ nodes.
 The Geth console is an interactive shell for the JavaScript runtime environment
 which exposes a node admin interface as well as the Ðapp JavaScript API.
 See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Console
-`},
+`,
+		},
 		{
 			Action: attach,
 			Name:   "attach",
@@ -347,7 +359,6 @@ JavaScript API. See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Conso
 		go metrics.CollectProcessMetrics(3 * time.Second)
 
 		utils.SetupNetwork(ctx)
-		utils.SetupVM(ctx)
 		return nil
 	}
 
@@ -417,6 +428,31 @@ func attach(ctx *cli.Context) {
 	}
 }
 
+// initGenesis will initialise the given JSON format genesis file and writes it as
+// the zero'd block (i.e. genesis) or will fail hard if it can't succeed.
+func initGenesis(ctx *cli.Context) {
+	genesisPath := ctx.Args().First()
+	if len(genesisPath) == 0 {
+		utils.Fatalf("must supply path to genesis JSON file")
+	}
+
+	chainDb, err := ethdb.NewLDBDatabase(filepath.Join(utils.MustMakeDataDir(ctx), "chaindata"), 0, 0)
+	if err != nil {
+		utils.Fatalf("could not open database: %v", err)
+	}
+
+	genesisFile, err := os.Open(genesisPath)
+	if err != nil {
+		utils.Fatalf("failed to read genesis file: %v", err)
+	}
+
+	block, err := core.WriteGenesisBlock(chainDb, genesisFile)
+	if err != nil {
+		utils.Fatalf("failed to write genesis block: %v", err)
+	}
+	glog.V(logger.Info).Infof("successfully wrote genesis block and/or chain rule set: %x", block.Hash())
+}
+
 // console starts a new geth node, attaching a JavaScript console to it at the
 // same time.
 func console(ctx *cli.Context) {
diff --git a/cmd/geth/usage.go b/cmd/geth/usage.go
index 55daa63d7..a31532bea 100644
--- a/cmd/geth/usage.go
+++ b/cmd/geth/usage.go
@@ -121,6 +121,7 @@ var AppHelpFlagGroups = []flagGroup{
 		Flags: []cli.Flag{
 			utils.MiningEnabledFlag,
 			utils.MinerThreadsFlag,
+			utils.TargetGasLimitFlag,
 			utils.MiningGPUFlag,
 			utils.AutoDAGFlag,
 			utils.EtherbaseFlag,
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index a00466d0a..3f54b40ca 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -34,7 +34,6 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
-	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/ethdb"
@@ -173,6 +172,11 @@ var (
 		Name:  "minergpus",
 		Usage: "List of GPUs to use for mining (e.g. '0,1' will use the first two GPUs found)",
 	}
+	TargetGasLimitFlag = cli.StringFlag{
+		Name:  "targetgaslimit",
+		Usage: "Target gas limit sets the artificial target gas floor for the blocks to mine",
+		Value: params.GenesisGasLimit.String(),
+	}
 	AutoDAGFlag = cli.BoolFlag{
 		Name:  "autodag",
 		Usage: "Enable automatic DAG pregeneration",
@@ -656,6 +660,7 @@ func MakeSystemNode(name, version string, extra []byte, ctx *cli.Context) *node.
 	accman := MakeAccountManager(ctx)
 
 	ethConf := &eth.Config{
+		ChainConfig:             MustMakeChainConfig(ctx),
 		Genesis:                 MakeGenesisBlock(ctx),
 		FastSync:                ctx.GlobalBool(FastSyncFlag.Name),
 		BlockChainVersion:       ctx.GlobalInt(BlockchainVersionFlag.Name),
@@ -701,8 +706,6 @@ func MakeSystemNode(name, version string, extra []byte, ctx *cli.Context) *node.
 			ethConf.Genesis = core.TestNetGenesisBlock()
 		}
 		state.StartingNonce = 1048576 // (2**20)
-		// overwrite homestead block
-		params.HomesteadBlock = params.TestNetHomesteadBlock
 
 	case ctx.GlobalBool(DevModeFlag.Name):
 		// Override the base network stack configs
@@ -758,25 +761,56 @@ func SetupNetwork(ctx *cli.Context) {
 		core.BlockReward = big.NewInt(1.5e+18)
 		core.ExpDiffPeriod = big.NewInt(math.MaxInt64)
 	}
+	params.TargetGasLimit = common.String2Big(ctx.GlobalString(TargetGasLimitFlag.Name))
 }
 
-// SetupVM configured the VM package's global settings
-func SetupVM(ctx *cli.Context) {
-	vm.EnableJit = ctx.GlobalBool(VMEnableJitFlag.Name)
-	vm.ForceJit = ctx.GlobalBool(VMForceJitFlag.Name)
-	vm.SetJITCacheSize(ctx.GlobalInt(VMJitCacheFlag.Name))
+// MustMakeChainConfig reads the chain configuration from the given database.
+func MustMakeChainConfig(ctx *cli.Context) *core.ChainConfig {
+	var (
+		db      = MakeChainDatabase(ctx)
+		genesis = core.GetBlock(db, core.GetCanonicalHash(db, 0))
+	)
+	defer db.Close()
+
+	chainConfig, err := core.GetChainConfig(db, genesis.Hash())
+	if err != nil {
+		if err != core.ChainConfigNotFoundErr {
+			Fatalf("Could not make chain configuration: %v", err)
+		}
+		var homesteadBlockNo *big.Int
+		if ctx.GlobalBool(TestNetFlag.Name) {
+			homesteadBlockNo = params.TestNetHomesteadBlock
+		} else {
+			homesteadBlockNo = params.MainNetHomesteadBlock
+		}
+
+		chainConfig = &core.ChainConfig{
+			HomesteadBlock: homesteadBlockNo,
+		}
+	}
+	return chainConfig
 }
 
-// MakeChain creates a chain manager from set command line flags.
-func MakeChain(ctx *cli.Context) (chain *core.BlockChain, chainDb ethdb.Database) {
-	datadir := MustMakeDataDir(ctx)
-	cache := ctx.GlobalInt(CacheFlag.Name)
-	handles := MakeDatabaseHandles()
+// MakeChainDatabase open an LevelDB using the flags passed to the client and will hard crash if it fails.
+func MakeChainDatabase(ctx *cli.Context) ethdb.Database {
+	var (
+		datadir = MustMakeDataDir(ctx)
+		cache   = ctx.GlobalInt(CacheFlag.Name)
+		handles = MakeDatabaseHandles()
+	)
 
-	var err error
-	if chainDb, err = ethdb.NewLDBDatabase(filepath.Join(datadir, "chaindata"), cache, handles); err != nil {
+	chainDb, err := ethdb.NewLDBDatabase(filepath.Join(datadir, "chaindata"), cache, handles)
+	if err != nil {
 		Fatalf("Could not open database: %v", err)
 	}
+	return chainDb
+}
+
+// MakeChain creates a chain manager from set command line flags.
+func MakeChain(ctx *cli.Context) (chain *core.BlockChain, chainDb ethdb.Database) {
+	var err error
+	chainDb = MakeChainDatabase(ctx)
+
 	if ctx.GlobalBool(OlympicFlag.Name) {
 		_, err := core.WriteTestNetGenesisBlock(chainDb)
 		if err != nil {
@@ -784,10 +818,10 @@ func MakeChain(ctx *cli.Context) (chain *core.BlockChain, chainDb ethdb.Database
 		}
 	}
 
-	eventMux := new(event.TypeMux)
-	pow := ethash.New()
-	//genesis := core.GenesisBlock(uint64(ctx.GlobalInt(GenesisNonceFlag.Name)), blockDB)
-	chain, err = core.NewBlockChain(chainDb, pow, eventMux)
+	chainConfig := MustMakeChainConfig(ctx)
+
+	var eventMux event.TypeMux
+	chain, err = core.NewBlockChain(chainDb, chainConfig, ethash.New(), &eventMux)
 	if err != nil {
 		Fatalf("Could not start chainmanager: %v", err)
 	}