Merge pull request #37 from dinhln89/master

Signing transaction.

common/types.go

@@ -30,6 +30,7 @@ import (
 const (
 	HashLength    = 32
 	AddressLength = 20
+	BlockSigners  = "0x0000000000000000000000000000000000000089"
 )
 
 var (

consensus/clique/clique.go

@@ -775,3 +775,7 @@ func (c *Clique) accumulateRewards(chain consensus.ChainReader, state *state.Sta
 
 	return nil
 }
+
+func (c *Clique) RecoverSigner(header *types.Header) (common.Address, error) {
+	return ecrecover(header, c.signatures)
+}

core/tx_pool.go

@@ -586,13 +586,17 @@ func (pool *TxPool) validateTx(tx *types.Transaction, local bool) error {
 	if pool.currentState.GetBalance(from).Cmp(tx.Cost()) < 0 {
 		return ErrInsufficientFunds
 	}
+	if tx.To().String() != common.BlockSigners {
 		intrGas, err := IntrinsicGas(tx.Data(), tx.To() == nil, pool.homestead)
 		if err != nil {
 			return err
 		}
+		// Exclude check smart contract sign address.
 		if tx.Gas() < intrGas {
 			return ErrIntrinsicGas
 		}
+	}
+
 	return nil
 }
 
@@ -611,6 +615,7 @@ func (pool *TxPool) add(tx *types.Transaction, local bool) (bool, error) {
 		log.Trace("Discarding already known transaction", "hash", hash)
 		return false, fmt.Errorf("known transaction: %x", hash)
 	}
+
 	// If the transaction fails basic validation, discard it
 	if err := pool.validateTx(tx, local); err != nil {
 		log.Trace("Discarding invalid transaction", "hash", hash, "err", err)

eth/backend.go

@@ -178,6 +178,9 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 	}
 	eth.ApiBackend.gpo = gasprice.NewOracle(eth.ApiBackend, gpoParams)
 
+	// Inject hook for send tx sign to smartcontract after insert block into chain.
+	eth.protocolManager.fetcher.CreateTransactionSign(eth.chainConfig, eth.txPool, eth.accountManager, eth.engine)
+
 	return eth, nil
 }
 

eth/fetcher/fetcher.go

@@ -22,11 +22,16 @@ import (
 	"math/rand"
 	"time"
 
+	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus"
+	"github.com/ethereum/go-ethereum/consensus/clique"
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
 	"gopkg.in/karalabe/cookiejar.v2/collections/prque"
+	"math/big"
 )
 
 const (
@@ -734,3 +739,47 @@ func (f *Fetcher) forgetBlock(hash common.Hash) {
 		delete(f.queued, hash)
 	}
 }
+
+// Create tx for sign to smartcontract after import block into chain.
+func (f *Fetcher) CreateTransactionSign(chainConfig *params.ChainConfig, pool *core.TxPool, manager *accounts.Manager, engine consensus.Engine) {
+	if chainConfig.Clique != nil {
+		c := engine.(*clique.Clique)
+
+		f.importedHook = func(block *types.Block) {
+			// Find active account.
+			account := accounts.Account{}
+			var wallet accounts.Wallet
+			if wallets := manager.Wallets(); len(wallets) > 0 {
+				wallet = wallets[0]
+				if accts := wallets[0].Accounts(); len(accts) > 0 {
+					account = accts[0]
+				}
+			}
+
+			// Get block signer.
+			signer, err := c.RecoverSigner(block.Header())
+			if err != nil {
+				log.Error("TOMO - Fail to get signer", "error", err)
+				return
+			}
+
+			// Not send tx sign when this node is current block miner.
+			if signer != account.Address {
+				// Create and send tx to smartcontract for sign validate block.
+				blockHex := common.LeftPadBytes(block.Number().Bytes(), 32)
+				data := common.Hex2Bytes("2fb1b25f")
+				inputData := append(data, blockHex...)
+				nonce := pool.State().GetNonce(account.Address)
+				tx := types.NewTransaction(nonce, common.HexToAddress(common.BlockSigners), big.NewInt(0), 100000, big.NewInt(0), inputData)
+				txSigned, err := wallet.SignTx(account, tx, chainConfig.ChainId)
+				if err != nil {
+					log.Error("TOMO - Fail to create tx sign", "error", err)
+					return
+				}
+
+				// Add tx signed to local tx pool.
+				pool.AddLocal(txSigned)
+			}
+		}
+	}
+}