core/state, core, miner: handle missing root error from state.New

cmd/evm/main.go

@@ -113,7 +113,7 @@ func run(ctx *cli.Context) {
 	glog.SetV(ctx.GlobalInt(VerbosityFlag.Name))
 
 	db, _ := ethdb.NewMemDatabase()
-	statedb := state.New(common.Hash{}, db)
+	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)))

cmd/geth/blocktestcmd.go

@@ -101,7 +101,8 @@ func runBlockTest(ctx *cli.Context) {
 
 func runOneBlockTest(ctx *cli.Context, test *tests.BlockTest) (*eth.Ethereum, error) {
 	cfg := utils.MakeEthConfig(ClientIdentifier, Version, ctx)
-	cfg.NewDB = func(path string) (ethdb.Database, error) { return ethdb.NewMemDatabase() }
+	db, _ := ethdb.NewMemDatabase()
+	cfg.NewDB = func(path string) (ethdb.Database, error) { return db, nil }
 	cfg.MaxPeers = 0 // disable network
 	cfg.Shh = false  // disable whisper
 	cfg.NAT = nil    // disable port mapping
@@ -113,7 +114,7 @@ func runOneBlockTest(ctx *cli.Context, test *tests.BlockTest) (*eth.Ethereum, er
 	// import the genesis block
 	ethereum.ResetWithGenesisBlock(test.Genesis)
 	// import pre accounts
-	_, err = test.InsertPreState(ethereum)
+	_, err = test.InsertPreState(db, cfg.AccountManager)
 	if err != nil {
 		return ethereum, fmt.Errorf("InsertPreState: %v", err)
 	}
@@ -123,7 +124,10 @@ func runOneBlockTest(ctx *cli.Context, test *tests.BlockTest) (*eth.Ethereum, er
 	if err != nil {
 		return ethereum, fmt.Errorf("Block Test load error: %v", err)
 	}
-	newDB := cm.State()
+	newDB, err := cm.State()
+	if err != nil {
+		return ethereum, fmt.Errorf("Block Test get state error: %v", err)
+	}
 	if err := test.ValidatePostState(newDB); err != nil {
 		return ethereum, fmt.Errorf("post state validation failed: %v", err)
 	}

cmd/geth/chaincmd.go

@@ -179,7 +179,11 @@ func dump(ctx *cli.Context) {
 			fmt.Println("{}")
 			utils.Fatalf("block not found")
 		} else {
-			state := state.New(block.Root(), chainDb)
+			state, err := state.New(block.Root(), chainDb)
+			if err != nil {
+				utils.Fatalf("could not create new state: %v", err)
+				return
+			}
 			fmt.Printf("%s\n", state.Dump())
 		}
 	}

core/block_processor.go

@@ -207,7 +207,10 @@ func (sm *BlockProcessor) Process(block *types.Block) (logs vm.Logs, receipts ty
 
 func (sm *BlockProcessor) processWithParent(block, parent *types.Block) (logs vm.Logs, receipts types.Receipts, err error) {
 	// Create a new state based on the parent's root (e.g., create copy)
-	state := state.New(parent.Root(), sm.chainDb)
+	state, err := state.New(parent.Root(), sm.chainDb)
+	if err != nil {
+		return nil, nil, err
+	}
 	header := block.Header()
 	uncles := block.Uncles()
 	txs := block.Transactions()

core/block_processor_test.go

@@ -46,7 +46,7 @@ func TestNumber(t *testing.T) {
 	pow := ezp.New()
 	_, chain := proc()
 
-	statedb := state.New(chain.Genesis().Root(), chain.chainDb)
+	statedb, _ := state.New(chain.Genesis().Root(), chain.chainDb)
 	header := makeHeader(chain.Genesis(), statedb)
 	header.Number = big.NewInt(3)
 	err := ValidateHeader(pow, header, chain.Genesis().Header(), false, false)

core/blockchain.go

@@ -199,7 +199,7 @@ func (self *BlockChain) SetProcessor(proc types.BlockProcessor) {
 	self.processor = proc
 }
 
-func (self *BlockChain) State() *state.StateDB {
+func (self *BlockChain) State() (*state.StateDB, error) {
 	return state.New(self.CurrentBlock().Root(), self.chainDb)
 }
 

core/chain_makers.go

@@ -156,7 +156,10 @@ func (b *BlockGen) OffsetTime(seconds int64) {
 // 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 {
-	statedb := state.New(parent.Root(), db)
+	statedb, err := state.New(parent.Root(), db)
+	if err != nil {
+		panic(err)
+	}
 	blocks := make(types.Blocks, n)
 	genblock := func(i int, h *types.Header) *types.Block {
 		b := &BlockGen{parent: parent, i: i, chain: blocks, header: h, statedb: statedb}

core/chain_makers_test.go

@@ -84,7 +84,7 @@ func ExampleGenerateChain() {
 		return
 	}
 
-	state := chainman.State()
+	state, _ := chainman.State()
 	fmt.Printf("last block: #%d\n", chainman.CurrentBlock().Number())
 	fmt.Println("balance of addr1:", state.GetBalance(addr1))
 	fmt.Println("balance of addr2:", state.GetBalance(addr2))

core/genesis.go

@@ -60,7 +60,8 @@ func WriteGenesisBlock(chainDb ethdb.Database, reader io.Reader) (*types.Block,
 		return nil, err
 	}
 
-	statedb := state.New(common.Hash{}, chainDb)
+	// creating with empty hash always works
+	statedb, _ := state.New(common.Hash{}, chainDb)
 	for addr, account := range genesis.Alloc {
 		address := common.HexToAddress(addr)
 		statedb.AddBalance(address, common.String2Big(account.Balance))
@@ -115,9 +116,9 @@ func WriteGenesisBlock(chainDb ethdb.Database, reader io.Reader) (*types.Block,
 }
 
 // GenesisBlockForTesting creates a block in which addr has the given wei balance.
-// The state trie of the block is written to db.
+// 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)
+	statedb, _ := state.New(common.Hash{}, db)
 	obj := statedb.GetOrNewStateObject(addr)
 	obj.SetBalance(balance)
 	root, err := statedb.Commit()

core/state/managed_state_test.go

@@ -27,7 +27,7 @@ var addr = common.BytesToAddress([]byte("test"))
 
 func create() (*ManagedState, *account) {
 	db, _ := ethdb.NewMemDatabase()
-	statedb := New(common.Hash{}, db)
+	statedb, _ := New(common.Hash{}, db)
 	ms := ManageState(statedb)
 	so := &StateObject{address: addr, nonce: 100}
 	ms.StateDB.stateObjects[addr.Str()] = so

core/state/state_test.go

@@ -77,12 +77,12 @@ func (s *StateSuite) TestDump(c *checker.C) {
 
 func (s *StateSuite) SetUpTest(c *checker.C) {
 	db, _ := ethdb.NewMemDatabase()
-	s.state = New(common.Hash{}, db)
+	s.state, _ = New(common.Hash{}, db)
 }
 
 func TestNull(t *testing.T) {
 	db, _ := ethdb.NewMemDatabase()
-	state := New(common.Hash{}, db)
+	state, _ := New(common.Hash{}, db)
 
 	address := common.HexToAddress("0x823140710bf13990e4500136726d8b55")
 	state.CreateAccount(address)
@@ -122,7 +122,7 @@ func (s *StateSuite) TestSnapshot(c *checker.C) {
 // printing/logging in tests (-check.vv does not work)
 func TestSnapshot2(t *testing.T) {
 	db, _ := ethdb.NewMemDatabase()
-	state := New(common.Hash{}, db)
+	state, _ := New(common.Hash{}, db)
 
 	stateobjaddr0 := toAddr([]byte("so0"))
 	stateobjaddr1 := toAddr([]byte("so1"))

core/state/statedb.go

@@ -52,20 +52,19 @@ type StateDB struct {
 }
 
 // Create a new state from a given trie
-func New(root common.Hash, db ethdb.Database) *StateDB {
+func New(root common.Hash, db ethdb.Database) (*StateDB, error) {
 	tr, err := trie.NewSecure(root, db)
 	if err != nil {
-		// TODO: bubble this up
-		tr, _ = trie.NewSecure(common.Hash{}, db)
 		glog.Errorf("can't create state trie with root %x: %v", root[:], err)
+		return nil, err
 	}
 	return &StateDB{
 		db:           db,
 		trie:         tr,
 		stateObjects: make(map[string]*StateObject),
 		refund:       new(big.Int),
 		logs:         make(map[common.Hash]vm.Logs),
-	}
+	}, nil
 }
 
 func (self *StateDB) StartRecord(thash, bhash common.Hash, ti int) {
@@ -297,7 +296,8 @@ func (self *StateDB) CreateAccount(addr common.Address) vm.Account {
 //
 
 func (self *StateDB) Copy() *StateDB {
-	state := New(common.Hash{}, self.db)
+	// ignore error - we assume state-to-be-copied always exists
+	state, _ := New(common.Hash{}, self.db)
 	state.trie = self.trie
 	for k, stateObject := range self.stateObjects {
 		state.stateObjects[k] = stateObject.Copy()

core/transaction_pool.go

@@ -48,7 +48,7 @@ const (
 	maxQueued = 64 // max limit of queued txs per address
 )
 
-type stateFn func() *state.StateDB
+type stateFn func() (*state.StateDB, error)
 
 // TxPool contains all currently known transactions. Transactions
 // enter the pool when they are received from the network or submitted
@@ -80,7 +80,7 @@ func NewTxPool(eventMux *event.TypeMux, currentStateFn stateFn, gasLimitFn func(
 		currentState: currentStateFn,
 		gasLimit:     gasLimitFn,
 		minGasPrice:  new(big.Int),
-		pendingState: state.ManageState(currentStateFn()),
+		pendingState: nil,
 		events:       eventMux.Subscribe(ChainHeadEvent{}, GasPriceChanged{}, RemovedTransactionEvent{}),
 	}
 	go pool.eventLoop()
@@ -109,7 +109,17 @@ func (pool *TxPool) eventLoop() {
 }
 
 func (pool *TxPool) resetState() {
-	pool.pendingState = state.ManageState(pool.currentState())
+	currentState, err := pool.currentState()
+	if err != nil {
+		glog.V(logger.Info).Infoln("failed to get current state: %v", err)
+		return
+	}
+	managedState := state.ManageState(currentState)
+	if err != nil {
+		glog.V(logger.Info).Infoln("failed to get managed state: %v", err)
+		return
+	}
+	pool.pendingState = managedState
 
 	// validate the pool of pending transactions, this will remove
 	// any transactions that have been included in the block or
@@ -180,12 +190,16 @@ func (pool *TxPool) validateTx(tx *types.Transaction) error {
 
 	// Make sure the account exist. Non existent accounts
 	// haven't got funds and well therefor never pass.
-	if !pool.currentState().HasAccount(from) {
+	currentState, err := pool.currentState()
+	if err != nil {
+		return err
+	}
+	if !currentState.HasAccount(from) {
 		return ErrNonExistentAccount
 	}
 
 	// Last but not least check for nonce errors
-	if pool.currentState().GetNonce(from) > tx.Nonce() {
+	if currentState.GetNonce(from) > tx.Nonce() {
 		return ErrNonce
 	}
 
@@ -204,7 +218,7 @@ func (pool *TxPool) validateTx(tx *types.Transaction) error {
 
 	// Transactor should have enough funds to cover the costs
 	// cost == V + GP * GL
-	if pool.currentState().GetBalance(from).Cmp(tx.Cost()) < 0 {
+	if currentState.GetBalance(from).Cmp(tx.Cost()) < 0 {
 		return ErrInsufficientFunds
 	}
 
@@ -257,6 +271,11 @@ func (self *TxPool) queueTx(hash common.Hash, tx *types.Transaction) {
 
 // addTx will add a transaction to the pending (processable queue) list of transactions
 func (pool *TxPool) addTx(hash common.Hash, addr common.Address, tx *types.Transaction) {
+	// init delayed since tx pool could have been started before any state sync
+	if pool.pendingState == nil {
+		pool.resetState()
+	}
+
 	if _, ok := pool.pending[hash]; !ok {
 		pool.pending[hash] = tx
 
@@ -382,14 +401,22 @@ func (pool *TxPool) RemoveTx(hash common.Hash) {
 
 // checkQueue moves transactions that have become processable to main pool.
 func (pool *TxPool) checkQueue() {
-	state := pool.pendingState
+	// init delayed since tx pool could have been started before any state sync
+	if pool.pendingState == nil {
+		pool.resetState()
+	}
 
 	var addq txQueue
 	for address, txs := range pool.queue {
 		// guessed nonce is the nonce currently kept by the tx pool (pending state)
-		guessedNonce := state.GetNonce(address)
+		guessedNonce := pool.pendingState.GetNonce(address)
 		// true nonce is the nonce known by the last state
-		trueNonce := pool.currentState().GetNonce(address)
+		currentState, err := pool.currentState()
+		if err != nil {
+			glog.Errorf("could not get current state: %v", err)
+			return
+		}
+		trueNonce := currentState.GetNonce(address)
 		addq := addq[:0]
 		for hash, tx := range txs {
 			if tx.Nonce() < trueNonce {
@@ -434,7 +461,11 @@ func (pool *TxPool) checkQueue() {
 
 // validatePool removes invalid and processed transactions from the main pool.
 func (pool *TxPool) validatePool() {
-	state := pool.currentState()
+	state, err := pool.currentState()
+	if err != nil {
+		glog.V(logger.Info).Infoln("failed to get current state: %v", err)
+		return
+	}
 	for hash, tx := range pool.pending {
 		from, _ := tx.From() // err already checked
 		// perform light nonce validation