func (self *XEth) AtStateNum(num int64) *XEth {
var st *state.StateDB
switch num {
case -2:
st = self.backend.Miner().PendingState().Copy()
default:
if block := self.getBlockByHeight(num); block != nil {
st = state.New(block.Root(), self.backend.StateDb())
} else {
st = state.New(self.backend.ChainManager().GetBlockByNumber(0).Root(), self.backend.StateDb())
}
}
return self.WithState(st)
}
// GenerateChain creates a chain of n blocks. The first block's
// parent will be the provided parent. db is used to store
// intermediate states and should contain the parent's state trie.
//
// The generator function is called with a new block generator for
// every block. Any transactions and uncles added to the generator
// become part of the block. If gen is nil, the blocks will be empty
// and their coinbase will be the zero address.
//
// Blocks created by GenerateChain do not contain valid proof of work
// values. Inserting them into BlockChain requires use of FakePow or
// a similar non-validating proof of work implementation.
func GenerateChain(parent *types.Block, db ethdb.Database, n int, gen func(int, *BlockGen)) ([]*types.Block, []types.Receipts) {
statedb, err := state.New(parent.Root(), db)
if err != nil {
panic(err)
}
blocks, receipts := make(types.Blocks, n), make([]types.Receipts, n)
genblock := func(i int, h *types.Header) (*types.Block, types.Receipts) {
b := &BlockGen{parent: parent, i: i, chain: blocks, header: h, statedb: statedb}
if gen != nil {
gen(i, b)
}
AccumulateRewards(statedb, h, b.uncles)
root, err := statedb.Commit()
if err != nil {
panic(fmt.Sprintf("state write error: %v", err))
}
h.Root = root
return types.NewBlock(h, b.txs, b.uncles, b.receipts), b.receipts
}
for i := 0; i < n; i++ {
header := makeHeader(parent, statedb)
block, receipt := genblock(i, header)
blocks[i] = block
receipts[i] = receipt
parent = block
}
return blocks, receipts
}
// Equivalent of the tx-pool state; updated by CheckTx and replaced on commit
// For now, we just return the last block state
func (app *EthereumApplication) ManagedState() *state.ManagedState {
st, err := state.New(app.StateRoot(), app.ethereum.ChainDb())
if err != nil {
return nil // (?!)
}
return state.ManageState(st)
}
// GenesisBlock creates a genesis block with the given nonce.
func GenesisBlock(nonce uint64, db common.Database) *types.Block {
var accounts map[string]struct {
Balance string
Code string
}
err := json.Unmarshal(GenesisAccounts, &accounts)
if err != nil {
fmt.Println("unable to decode genesis json data:", err)
os.Exit(1)
}
statedb := state.New(common.Hash{}, db)
for addr, account := range accounts {
codedAddr := common.Hex2Bytes(addr)
accountState := statedb.CreateAccount(common.BytesToAddress(codedAddr))
accountState.SetBalance(common.Big(account.Balance))
accountState.SetCode(common.FromHex(account.Code))
statedb.UpdateStateObject(accountState)
}
statedb.Sync()
block := types.NewBlock(&types.Header{
Difficulty: params.GenesisDifficulty,
GasLimit: params.GenesisGasLimit,
Nonce: types.EncodeNonce(nonce),
Root: statedb.Root(),
}, nil, nil, nil)
block.Td = params.GenesisDifficulty
return block
}
// Execute executes the code using the input as call data during the execution.
// It returns the EVM's return value, the new state and an error if it failed.
//
// Executes sets up a in memory, temporarily, environment for the execution of
// the given code. It enabled the JIT by default and make sure that it's restored
// to it's original state afterwards.
func Execute(code, input []byte, cfg *Config) ([]byte, *state.StateDB, error) {
if cfg == nil {
cfg = new(Config)
}
setDefaults(cfg)
if cfg.State == nil {
db, _ := ethdb.NewMemDatabase()
cfg.State, _ = state.New(common.Hash{}, db)
}
var (
vmenv = NewEnv(cfg, cfg.State)
sender = cfg.State.CreateAccount(cfg.Origin)
receiver = cfg.State.CreateAccount(common.StringToAddress("contract"))
)
// set the receiver's (the executing contract) code for execution.
receiver.SetCode(code)
// Call the code with the given configuration.
ret, err := vmenv.Call(
sender,
receiver.Address(),
input,
cfg.GasLimit,
cfg.GasPrice,
cfg.Value,
)
return ret, cfg.State, err
}
func TestTransactionChainFork(t *testing.T) {
pool, key := setupTxPool()
addr := crypto.PubkeyToAddress(key.PublicKey)
resetState := func() {
db, _ := ethdb.NewMemDatabase()
statedb, _ := state.New(common.Hash{}, db)
pool.currentState = func() (*state.StateDB, error) { return statedb, nil }
currentState, _ := pool.currentState()
currentState.AddBalance(addr, big.NewInt(100000000000000))
pool.resetState()
}
resetState()
tx := transaction(0, big.NewInt(100000), key)
if err := pool.add(tx); err != nil {
t.Error("didn't expect error", err)
}
pool.RemoveTransactions([]*types.Transaction{tx})
// reset the pool's internal state
resetState()
if err := pool.add(tx); err != nil {
t.Error("didn't expect error", err)
}
}
func (self *XEth) LatestState() *XEth {
st, err := state.New(self.StateRoot(), self.backend.ChainDb())
if err != nil {
return nil
}
return self.WithState(st)
}
// testBlockChainImport tries to process a chain of blocks, writing them into
// the database if successful.
func testBlockChainImport(chain types.Blocks, blockchain *BlockChain) error {
for _, block := range chain {
// Try and process the block
err := blockchain.Validator().ValidateBlock(block)
if err != nil {
if IsKnownBlockErr(err) {
continue
}
return err
}
statedb, err := state.New(blockchain.GetBlock(block.ParentHash()).Root(), blockchain.chainDb)
if err != nil {
return err
}
receipts, _, usedGas, err := blockchain.Processor().Process(block, statedb)
if err != nil {
reportBlock(block, err)
return err
}
err = blockchain.Validator().ValidateState(block, blockchain.GetBlock(block.ParentHash()), statedb, receipts, usedGas)
if err != nil {
reportBlock(block, err)
return err
}
blockchain.mu.Lock()
WriteTd(blockchain.chainDb, block.Hash(), new(big.Int).Add(block.Difficulty(), blockchain.GetTd(block.ParentHash())))
WriteBlock(blockchain.chainDb, block)
statedb.Commit()
blockchain.mu.Unlock()
}
return nil
}
func (js *jsre) dumpBlock(call otto.FunctionCall) otto.Value {
var block *types.Block
if len(call.ArgumentList) > 0 {
if call.Argument(0).IsNumber() {
num, _ := call.Argument(0).ToInteger()
block = js.ethereum.ChainManager().GetBlockByNumber(uint64(num))
} else if call.Argument(0).IsString() {
hash, _ := call.Argument(0).ToString()
block = js.ethereum.ChainManager().GetBlock(common.HexToHash(hash))
} else {
fmt.Println("invalid argument for dump. Either hex string or number")
}
} else {
block = js.ethereum.ChainManager().CurrentBlock()
}
if block == nil {
fmt.Println("block not found")
return otto.UndefinedValue()
}
statedb := state.New(block.Root(), js.ethereum.StateDb())
dump := statedb.RawDump()
return js.re.ToVal(dump)
}
// makeCurrent creates a new environment for the current cycle.
func (self *worker) makeCurrent(parent *types.Block, header *types.Header) {
state := state.New(parent.Root(), self.eth.ChainDb())
work := &Work{
state: state,
ancestors: set.New(),
family: set.New(),
uncles: set.New(),
header: header,
coinbase: state.GetOrNewStateObject(self.coinbase),
createdAt: time.Now(),
}
// when 08 is processed ancestors contain 07 (quick block)
for _, ancestor := range self.chain.GetBlocksFromHash(parent.Hash(), 7) {
for _, uncle := range ancestor.Uncles() {
work.family.Add(uncle.Hash())
}
work.family.Add(ancestor.Hash())
work.ancestors.Add(ancestor.Hash())
}
accounts, _ := self.eth.AccountManager().Accounts()
// Keep track of transactions which return errors so they can be removed
work.remove = set.New()
work.tcount = 0
work.ignoredTransactors = set.New()
work.lowGasTransactors = set.New()
work.ownedAccounts = accountAddressesSet(accounts)
if self.current != nil {
work.localMinedBlocks = self.current.localMinedBlocks
}
self.current = work
}
func (self *Gui) DumpState(hash, path string) {
var stateDump []byte
if len(hash) == 0 {
stateDump = self.eth.ChainManager().State().Dump()
} else {
var block *types.Block
if hash[0] == '#' {
i, _ := strconv.Atoi(hash[1:])
block = self.eth.ChainManager().GetBlockByNumber(uint64(i))
} else {
block = self.eth.ChainManager().GetBlock(common.HexToHash(hash))
}
if block == nil {
guilogger.Infof("block err: not found %s\n", hash)
return
}
stateDump = state.New(block.Root(), self.eth.StateDb()).Dump()
}
file, err := os.OpenFile(path[7:], os.O_CREATE|os.O_RDWR, os.ModePerm)
if err != nil {
guilogger.Infoln("dump err: ", err)
return
}
defer file.Close()
guilogger.Infof("dumped state (%s) to %s\n", hash, path)
file.Write(stateDump)
}
// subscribes to new head block events and
// waits until blockchain height is greater n at any time
// given the current head, waits for the next chain event
// sets the state to the current head
// loop is async and quit by closing the channel
// used in tests and JS console debug module to control advancing private chain manually
// Note: this is not threadsafe, only called in JS single process and tests
func (self *XEth) UpdateState() (wait chan *big.Int) {
wait = make(chan *big.Int)
go func() {
sub := self.backend.EventMux().Subscribe(core.ChainHeadEvent{})
var m, n *big.Int
var ok bool
out:
for {
select {
case event := <-sub.Chan():
ev, ok := event.(core.ChainHeadEvent)
if ok {
m = ev.Block.Number()
if n != nil && n.Cmp(m) < 0 {
wait <- n
n = nil
}
statedb := state.New(ev.Block.Root(), self.backend.StateDb())
self.state = NewState(self, statedb)
}
case n, ok = <-wait:
if !ok {
break out
}
}
}
sub.Unsubscribe()
}()
return
}
func TestTransactionDoubleNonce(t *testing.T) {
pool, key := setupTxPool()
addr := crypto.PubkeyToAddress(key.PublicKey)
resetState := func() {
db, _ := ethdb.NewMemDatabase()
statedb := state.New(common.Hash{}, db)
pool.currentState = func() *state.StateDB { return statedb }
pool.currentState().AddBalance(addr, big.NewInt(100000000000000))
pool.resetState()
}
resetState()
tx := transaction(0, big.NewInt(100000), key)
tx2 := transaction(0, big.NewInt(1000000), key)
if err := pool.add(tx); err != nil {
t.Error("didn't expect error", err)
}
if err := pool.add(tx2); err != nil {
t.Error("didn't expect error", err)
}
pool.checkQueue()
if len(pool.pending) != 2 {
t.Error("expected 2 pending txs. Got", len(pool.pending))
}
}
// Process block will attempt to process the given block's transactions and applies them
// on top of the block's parent state (given it exists) and will return wether it was
// successful or not.
func (sm *BlockProcessor) Process(block *types.Block) (logs vm.Logs, receipts types.Receipts, err error) {
// Processing a blocks may never happen simultaneously
sm.mutex.Lock()
defer sm.mutex.Unlock()
if sm.bc.HasBlock(block.Hash()) {
if _, err := state.New(block.Root(), sm.chainDb); err == nil {
return nil, nil, &KnownBlockError{block.Number(), block.Hash()}
}
}
if parent := sm.bc.GetBlock(block.ParentHash()); parent != nil {
if _, err := state.New(parent.Root(), sm.chainDb); err == nil {
return sm.processWithParent(block, parent)
}
}
return nil, nil, ParentError(block.ParentHash())
}
func setupTxPool() (*TxPool, *ecdsa.PrivateKey) {
db, _ := ethdb.NewMemDatabase()
statedb := state.New(common.Hash{}, db)
var m event.TypeMux
key, _ := crypto.GenerateKey()
return NewTxPool(&m, func() *state.StateDB { return statedb }, func() *big.Int { return big.NewInt(1000000) }), key
}
// StorageAt returns the data stores in the state for the given address and location.
func (be *registryAPIBackend) StorageAt(addr string, storageAddr string) string {
block := be.bc.CurrentBlock()
state, err := state.New(block.Root(), be.chainDb)
if err != nil {
return ""
}
return state.GetState(common.HexToAddress(addr), common.HexToHash(storageAddr)).Hex()
}
// WriteBlock writes the block to the chain (or pending queue)
func (self *ChainManager) WriteBlock(block *types.Block, queued bool) (status writeStatus, err error) {
self.wg.Add(1)
defer self.wg.Done()
cblock := self.currentBlock
// Compare the TD of the last known block in the canonical chain to make sure it's greater.
// At this point it's possible that a different chain (fork) becomes the new canonical chain.
if block.Td.Cmp(self.Td()) > 0 {
// chain fork
if block.ParentHash() != cblock.Hash() {
// during split we merge two different chains and create the new canonical chain
err := self.merge(cblock, block)
if err != nil {
return nonStatTy, err
}
status = splitStatTy
}
self.mu.Lock()
self.setTotalDifficulty(block.Td)
self.insert(block)
self.mu.Unlock()
self.setTransState(state.New(block.Root(), self.stateDb))
self.txState.SetState(state.New(block.Root(), self.stateDb))
status = canonStatTy
} else {
status = sideStatTy
}
if queued {
// Write block to database. Eventually we'll have to improve on this and throw away blocks that are
// not in the canonical chain.
self.mu.Lock()
self.enqueueForWrite(block)
self.mu.Unlock()
} else {
self.write(block)
}
// Delete from future blocks
self.futureBlocks.Remove(block.Hash())
return
}
func setupTxPool() (*TxPool, *ecdsa.PrivateKey) {
db, _ := ethdb.NewMemDatabase()
statedb, _ := state.New(common.Hash{}, db)
var m event.TypeMux
key, _ := crypto.GenerateKey()
newPool := NewTxPool(testChainConfig(), &m, func() (*state.StateDB, error) { return statedb, nil }, func() *big.Int { return big.NewInt(1000000) })
newPool.resetState()
return newPool, key
}
// HasBlockAndState checks if a block and associated state trie is fully present
// in the database or not, caching it if present.
func (bc *BlockChain) HasBlockAndState(hash common.Hash) bool {
// Check first that the block itself is known
block := bc.GetBlock(hash)
if block == nil {
return false
}
// Ensure the associated state is also present
_, err := state.New(block.Root(), bc.chainDb)
return err == nil
}
// WriteBlock writes the block to the chain (or pending queue)
func (self *ChainManager) WriteBlock(block *types.Block, queued bool) (status writeStatus, err error) {
self.wg.Add(1)
defer self.wg.Done()
cblock := self.currentBlock
// Compare the TD of the last known block in the canonical chain to make sure it's greater.
// At this point it's possible that a different chain (fork) becomes the new canonical chain.
if block.Td.Cmp(self.Td()) > 0 {
// chain fork
if block.ParentHash() != cblock.Hash() {
// during split we merge two different chains and create the new canonical chain
err := self.merge(cblock, block)
if err != nil {
return NonStatTy, err
}
status = SplitStatTy
}
self.mu.Lock()
self.setTotalDifficulty(block.Td)
self.insert(block)
self.mu.Unlock()
self.setTransState(state.New(block.Root(), self.stateDb))
self.txState.SetState(state.New(block.Root(), self.stateDb))
status = CanonStatTy
} else {
status = SideStatTy
}
err = WriteBlock(self.blockDb, block)
if err != nil {
glog.Fatalln("db err:", err)
}
// Delete from future blocks
self.futureBlocks.Remove(block.Hash())
return
}
// Actually make a block by simulating what miner would do
// we seed chains by the first byte of the coinbase
func makeBlock(bman *BlockProcessor, parent *types.Block, i int, db common.Database, seed int) *types.Block {
var addr common.Address
addr[0], addr[19] = byte(seed), byte(i)
block := newBlockFromParent(addr, parent)
state := state.New(block.Root(), db)
cbase := state.GetOrNewStateObject(addr)
cbase.SetGasPool(CalcGasLimit(parent))
cbase.AddBalance(BlockReward)
state.Update()
block.SetRoot(state.Root())
return block
}
// SendTransaction implements ContractTransactor.SendTransaction, delegating the raw
// transaction injection to the remote node.
func (b *SimulatedBackend) SendTransaction(tx *types.Transaction) error {
blocks, _ := core.GenerateChain(b.blockchain.CurrentBlock(), b.database, 1, func(number int, block *core.BlockGen) {
for _, tx := range b.pendingBlock.Transactions() {
block.AddTx(tx)
}
block.AddTx(tx)
})
b.pendingBlock = blocks[0]
b.pendingState, _ = state.New(b.pendingBlock.Root(), b.database)
return nil
}
// Create a new chain manager starting from given block
// Effectively a fork factory
func newChainManager(block *types.Block, eventMux *event.TypeMux, db common.Database) *ChainManager {
genesis := GenesisBlock(db)
bc := &ChainManager{blockDb: db, stateDb: db, genesisBlock: genesis, eventMux: eventMux}
bc.txState = state.ManageState(state.New(genesis.Root(), db))
bc.futureBlocks = NewBlockCache(1000)
if block == nil {
bc.Reset()
} else {
bc.currentBlock = block
bc.td = block.Td
}
return bc
}
func env(block *types.Block, eth core.Backend) *environment {
state := state.New(block.Root(), eth.StateDb())
env := &environment{
totalUsedGas: new(big.Int),
state: state,
block: block,
family: set.New(),
uncles: set.New(),
coinbase: state.GetOrNewStateObject(block.Coinbase()),
}
return env
}
// ValidateBlock validates the given block's header and uncles and verifies the
// the block header's transaction and uncle roots.
//
// ValidateBlock does not validate the header's pow. The pow work validated
// separately so we can process them in parallel.
//
// ValidateBlock also validates and makes sure that any previous state (or present)
// state that might or might not be present is checked to make sure that fast
// sync has done it's job proper. This prevents the block validator form accepting
// false positives where a header is present but the state is not.
func (v *BlockValidator) ValidateBlock(block *types.Block) error {
if v.bc.HasBlock(block.Hash()) {
if _, err := state.New(block.Root(), v.bc.chainDb); err == nil {
return &KnownBlockError{block.Number(), block.Hash()}
}
}
parent := v.bc.GetBlock(block.ParentHash())
if parent == nil {
return ParentError(block.ParentHash())
}
if _, err := state.New(parent.Root(), v.bc.chainDb); err != nil {
return ParentError(block.ParentHash())
}
header := block.Header()
// validate the block header
if err := ValidateHeader(v.config, v.Pow, header, parent.Header(), false, false); err != nil {
return err
}
// verify the uncles are correctly rewarded
if err := v.VerifyUncles(block, parent); err != nil {
return err
}
// Verify UncleHash before running other uncle validations
unclesSha := types.CalcUncleHash(block.Uncles())
if unclesSha != header.UncleHash {
return fmt.Errorf("invalid uncles root hash. received=%x calculated=%x", header.UncleHash, unclesSha)
}
// The transactions Trie's root (R = (Tr [[i, RLP(T1)], [i, RLP(T2)], ... [n, RLP(Tn)]]))
// can be used by light clients to make sure they've received the correct Txs
txSha := types.DeriveSha(block.Transactions())
if txSha != header.TxHash {
return fmt.Errorf("invalid transaction root hash. received=%x calculated=%x", header.TxHash, txSha)
}
return nil
}
// GenesisBlockForTesting creates a block in which addr has the given wei balance.
// The state trie of the block is written to db.
func GenesisBlockForTesting(db ethdb.Database, addr common.Address, balance *big.Int) *types.Block {
statedb := state.New(common.Hash{}, db)
obj := statedb.GetOrNewStateObject(addr)
obj.SetBalance(balance)
statedb.SyncObjects()
statedb.Sync()
block := types.NewBlock(&types.Header{
Difficulty: params.GenesisDifficulty,
GasLimit: params.GenesisGasLimit,
Root: statedb.Root(),
}, nil, nil, nil)
return block
}
func run(ctx *cli.Context) {
vm.Debug = ctx.GlobalBool(DebugFlag.Name)
vm.ForceJit = ctx.GlobalBool(ForceJitFlag.Name)
vm.EnableJit = !ctx.GlobalBool(DisableJitFlag.Name)
glog.SetToStderr(true)
glog.SetV(ctx.GlobalInt(VerbosityFlag.Name))
db, _ := ethdb.NewMemDatabase()
statedb, _ := state.New(common.Hash{}, db)
sender := statedb.CreateAccount(common.StringToAddress("sender"))
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)))
tstart := time.Now()
ret, e := vmenv.Call(
sender,
receiver.Address(),
common.Hex2Bytes(ctx.GlobalString(InputFlag.Name)),
common.Big(ctx.GlobalString(GasFlag.Name)),
common.Big(ctx.GlobalString(PriceFlag.Name)),
common.Big(ctx.GlobalString(ValueFlag.Name)),
)
vmdone := time.Since(tstart)
if ctx.GlobalBool(DumpFlag.Name) {
fmt.Println(string(statedb.Dump()))
}
vm.StdErrFormat(vmenv.StructLogs())
if ctx.GlobalBool(SysStatFlag.Name) {
var mem runtime.MemStats
runtime.ReadMemStats(&mem)
fmt.Printf("vm took %v\n", vmdone)
fmt.Printf(`alloc: %d
tot alloc: %d
no. malloc: %d
heap alloc: %d
heap objs: %d
num gc: %d
`, mem.Alloc, mem.TotalAlloc, mem.Mallocs, mem.HeapAlloc, mem.HeapObjects, mem.NumGC)
}
fmt.Printf("OUT: 0x%x", ret)
if e != nil {
fmt.Printf(" error: %v", e)
}
fmt.Println()
}
// InsertPreState populates the given database with the genesis
// accounts defined by the test.
func (t *BlockTest) InsertPreState(db ethdb.Database, am *accounts.Manager) (*state.StateDB, error) {
statedb, err := state.New(common.Hash{}, db)
if err != nil {
return nil, err
}
for addrString, acct := range t.preAccounts {
addr, err := hex.DecodeString(addrString)
if err != nil {
return nil, err
}
code, err := hex.DecodeString(strings.TrimPrefix(acct.Code, "0x"))
if err != nil {
return nil, err
}
balance, ok := new(big.Int).SetString(acct.Balance, 0)
if !ok {
return nil, err
}
nonce, err := strconv.ParseUint(prepInt(16, acct.Nonce), 16, 64)
if err != nil {
return nil, err
}
if acct.PrivateKey != "" {
privkey, err := hex.DecodeString(strings.TrimPrefix(acct.PrivateKey, "0x"))
err = crypto.ImportBlockTestKey(privkey)
err = am.TimedUnlock(common.BytesToAddress(addr), "", 999999*time.Second)
if err != nil {
return nil, err
}
}
obj := statedb.CreateAccount(common.HexToAddress(addrString))
obj.SetCode(code)
obj.SetBalance(balance)
obj.SetNonce(nonce)
for k, v := range acct.Storage {
statedb.SetState(common.HexToAddress(addrString), common.HexToHash(k), common.HexToHash(v))
}
}
root, err := statedb.Commit()
if err != nil {
return nil, fmt.Errorf("error writing state: %v", err)
}
if t.Genesis.Root() != root {
return nil, fmt.Errorf("computed state root does not match genesis block: genesis=%x computed=%x", t.Genesis.Root().Bytes()[:4], root.Bytes()[:4])
}
return statedb, nil
}
// Register registers a new content hash in the registry.
func (api *PrivateRegistarAPI) Register(sender common.Address, addr common.Address, contentHashHex string) (bool, error) {
block := api.be.bc.CurrentBlock()
state, err := state.New(block.Root(), api.be.chainDb)
if err != nil {
return false, err
}
codeb := state.GetCode(addr)
codeHash := common.BytesToHash(crypto.Keccak256(codeb))
contentHash := common.HexToHash(contentHashHex)
_, err = registrar.New(api.be).SetHashToHash(sender, codeHash, contentHash)
return err == nil, err
}
// GenesisBlockForTesting creates a block in which addr has the given wei balance.
// The state trie of the block is written to db. the passed db needs to contain a state root
func GenesisBlockForTesting(db ethdb.Database, addr common.Address, balance *big.Int) *types.Block {
statedb, _ := state.New(common.Hash{}, db)
obj := statedb.GetOrNewStateObject(addr)
obj.SetBalance(balance)
root, err := statedb.Commit()
if err != nil {
panic(fmt.Sprintf("cannot write state: %v", err))
}
block := types.NewBlock(&types.Header{
Difficulty: params.GenesisDifficulty,
GasLimit: params.GenesisGasLimit,
Root: root,
}, nil, nil, nil)
return block
}