Merge pull request #2159 from zsfelfoldi/light-backend

eth: separate common and full node-specific API and backend service

2 files changed, 1661 insertions, 0 deletions

diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
new file mode 100644
index 000000000..6e888fc93
--- /dev/null
+++ b/internal/ethapi/api.go
@@ -0,0 +1,1542 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package ethapi
+
+import (
+	"bytes"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"math/big"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/ethereum/ethash"
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/compiler"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/p2p"
+	"github.com/ethereum/go-ethereum/rlp"
+	"github.com/ethereum/go-ethereum/rpc"
+	"github.com/syndtr/goleveldb/leveldb"
+	"golang.org/x/net/context"
+)
+
+const defaultGas = uint64(90000)
+
+// PublicEthereumAPI provides an API to access Ethereum related information.
+// It offers only methods that operate on public data that is freely available to anyone.
+type PublicEthereumAPI struct {
+	b        Backend
+	solcPath *string
+	solc     **compiler.Solidity
+}
+
+// NewPublicEthereumAPI creates a new Etheruem protocol API.
+func NewPublicEthereumAPI(b Backend, solcPath *string, solc **compiler.Solidity) *PublicEthereumAPI {
+	return &PublicEthereumAPI{b, solcPath, solc}
+}
+
+// GasPrice returns a suggestion for a gas price.
+func (s *PublicEthereumAPI) GasPrice(ctx context.Context) (*big.Int, error) {
+	return s.b.SuggestPrice(ctx)
+}
+
+func (s *PublicEthereumAPI) getSolc() (*compiler.Solidity, error) {
+	var err error
+	solc := *s.solc
+	if solc == nil {
+		solc, err = compiler.New(*s.solcPath)
+	}
+	return solc, err
+}
+
+// GetCompilers returns the collection of available smart contract compilers
+func (s *PublicEthereumAPI) GetCompilers() ([]string, error) {
+	solc, err := s.getSolc()
+	if err == nil && solc != nil {
+		return []string{"Solidity"}, nil
+	}
+
+	return []string{}, nil
+}
+
+// CompileSolidity compiles the given solidity source
+func (s *PublicEthereumAPI) CompileSolidity(source string) (map[string]*compiler.Contract, error) {
+	solc, err := s.getSolc()
+	if err != nil {
+		return nil, err
+	}
+
+	if solc == nil {
+		return nil, errors.New("solc (solidity compiler) not found")
+	}
+
+	return solc.Compile(source)
+}
+
+// ProtocolVersion returns the current Ethereum protocol version this node supports
+func (s *PublicEthereumAPI) ProtocolVersion() *rpc.HexNumber {
+	return rpc.NewHexNumber(s.b.ProtocolVersion())
+}
+
+// Syncing returns false in case the node is currently not syncing with the network. It can be up to date or has not
+// yet received the latest block headers from its pears. In case it is synchronizing:
+// - startingBlock: block number this node started to synchronise from
+// - currentBlock:  block number this node is currently importing
+// - highestBlock:  block number of the highest block header this node has received from peers
+// - pulledStates:  number of state entries processed until now
+// - knownStates:   number of known state entries that still need to be pulled
+func (s *PublicEthereumAPI) Syncing() (interface{}, error) {
+	origin, current, height, pulled, known := s.b.Downloader().Progress()
+
+	// Return not syncing if the synchronisation already completed
+	if current >= height {
+		return false, nil
+	}
+	// Otherwise gather the block sync stats
+	return map[string]interface{}{
+		"startingBlock": rpc.NewHexNumber(origin),
+		"currentBlock":  rpc.NewHexNumber(current),
+		"highestBlock":  rpc.NewHexNumber(height),
+		"pulledStates":  rpc.NewHexNumber(pulled),
+		"knownStates":   rpc.NewHexNumber(known),
+	}, nil
+}
+
+// PublicTxPoolAPI offers and API for the transaction pool. It only operates on data that is non confidential.
+type PublicTxPoolAPI struct {
+	b Backend
+}
+
+// NewPublicTxPoolAPI creates a new tx pool service that gives information about the transaction pool.
+func NewPublicTxPoolAPI(b Backend) *PublicTxPoolAPI {
+	return &PublicTxPoolAPI{b}
+}
+
+// Content returns the transactions contained within the transaction pool.
+func (s *PublicTxPoolAPI) Content() map[string]map[string]map[string][]*RPCTransaction {
+	content := map[string]map[string]map[string][]*RPCTransaction{
+		"pending": make(map[string]map[string][]*RPCTransaction),
+		"queued":  make(map[string]map[string][]*RPCTransaction),
+	}
+	pending, queue := s.b.TxPoolContent()
+
+	// Flatten the pending transactions
+	for account, batches := range pending {
+		dump := make(map[string][]*RPCTransaction)
+		for nonce, txs := range batches {
+			nonce := fmt.Sprintf("%d", nonce)
+			for _, tx := range txs {
+				dump[nonce] = append(dump[nonce], newRPCPendingTransaction(tx))
+			}
+		}
+		content["pending"][account.Hex()] = dump
+	}
+	// Flatten the queued transactions
+	for account, batches := range queue {
+		dump := make(map[string][]*RPCTransaction)
+		for nonce, txs := range batches {
+			nonce := fmt.Sprintf("%d", nonce)
+			for _, tx := range txs {
+				dump[nonce] = append(dump[nonce], newRPCPendingTransaction(tx))
+			}
+		}
+		content["queued"][account.Hex()] = dump
+	}
+	return content
+}
+
+// Status returns the number of pending and queued transaction in the pool.
+func (s *PublicTxPoolAPI) Status() map[string]*rpc.HexNumber {
+	pending, queue := s.b.Stats()
+	return map[string]*rpc.HexNumber{
+		"pending": rpc.NewHexNumber(pending),
+		"queued":  rpc.NewHexNumber(queue),
+	}
+}
+
+// Inspect retrieves the content of the transaction pool and flattens it into an
+// easily inspectable list.
+func (s *PublicTxPoolAPI) Inspect() map[string]map[string]map[string][]string {
+	content := map[string]map[string]map[string][]string{
+		"pending": make(map[string]map[string][]string),
+		"queued":  make(map[string]map[string][]string),
+	}
+	pending, queue := s.b.TxPoolContent()
+
+	// Define a formatter to flatten a transaction into a string
+	var format = func(tx *types.Transaction) string {
+		if to := tx.To(); to != nil {
+			return fmt.Sprintf("%s: %v wei + %v × %v gas", tx.To().Hex(), tx.Value(), tx.Gas(), tx.GasPrice())
+		}
+		return fmt.Sprintf("contract creation: %v wei + %v × %v gas", tx.Value(), tx.Gas(), tx.GasPrice())
+	}
+	// Flatten the pending transactions
+	for account, batches := range pending {
+		dump := make(map[string][]string)
+		for nonce, txs := range batches {
+			nonce := fmt.Sprintf("%d", nonce)
+			for _, tx := range txs {
+				dump[nonce] = append(dump[nonce], format(tx))
+			}
+		}
+		content["pending"][account.Hex()] = dump
+	}
+	// Flatten the queued transactions
+	for account, batches := range queue {
+		dump := make(map[string][]string)
+		for nonce, txs := range batches {
+			nonce := fmt.Sprintf("%d", nonce)
+			for _, tx := range txs {
+				dump[nonce] = append(dump[nonce], format(tx))
+			}
+		}
+		content["queued"][account.Hex()] = dump
+	}
+	return content
+}
+
+// PublicAccountAPI provides an API to access accounts managed by this node.
+// It offers only methods that can retrieve accounts.
+type PublicAccountAPI struct {
+	am *accounts.Manager
+}
+
+// NewPublicAccountAPI creates a new PublicAccountAPI.
+func NewPublicAccountAPI(am *accounts.Manager) *PublicAccountAPI {
+	return &PublicAccountAPI{am: am}
+}
+
+// Accounts returns the collection of accounts this node manages
+func (s *PublicAccountAPI) Accounts() []accounts.Account {
+	return s.am.Accounts()
+}
+
+// PrivateAccountAPI provides an API to access accounts managed by this node.
+// It offers methods to create, (un)lock en list accounts. Some methods accept
+// passwords and are therefore considered private by default.
+type PrivateAccountAPI struct {
+	am *accounts.Manager
+	b  Backend
+}
+
+// NewPrivateAccountAPI create a new PrivateAccountAPI.
+func NewPrivateAccountAPI(b Backend) *PrivateAccountAPI {
+	return &PrivateAccountAPI{
+		am: b.AccountManager(),
+		b:  b,
+	}
+}
+
+// ListAccounts will return a list of addresses for accounts this node manages.
+func (s *PrivateAccountAPI) ListAccounts() []common.Address {
+	accounts := s.am.Accounts()
+	addresses := make([]common.Address, len(accounts))
+	for i, acc := range accounts {
+		addresses[i] = acc.Address
+	}
+	return addresses
+}
+
+// NewAccount will create a new account and returns the address for the new account.
+func (s *PrivateAccountAPI) NewAccount(password string) (common.Address, error) {
+	acc, err := s.am.NewAccount(password)
+	if err == nil {
+		return acc.Address, nil
+	}
+	return common.Address{}, err
+}
+
+// ImportRawKey stores the given hex encoded ECDSA key into the key directory,
+// encrypting it with the passphrase.
+func (s *PrivateAccountAPI) ImportRawKey(privkey string, password string) (common.Address, error) {
+	hexkey, err := hex.DecodeString(privkey)
+	if err != nil {
+		return common.Address{}, err
+	}
+
+	acc, err := s.am.ImportECDSA(crypto.ToECDSA(hexkey), password)
+	return acc.Address, err
+}
+
+// UnlockAccount will unlock the account associated with the given address with
+// the given password for duration seconds. If duration is nil it will use a
+// default of 300 seconds. It returns an indication if the account was unlocked.
+func (s *PrivateAccountAPI) UnlockAccount(addr common.Address, password string, duration *rpc.HexNumber) (bool, error) {
+	if duration == nil {
+		duration = rpc.NewHexNumber(300)
+	}
+	a := accounts.Account{Address: addr}
+	d := time.Duration(duration.Int64()) * time.Second
+	if err := s.am.TimedUnlock(a, password, d); err != nil {
+		return false, err
+	}
+	return true, nil
+}
+
+// LockAccount will lock the account associated with the given address when it's unlocked.
+func (s *PrivateAccountAPI) LockAccount(addr common.Address) bool {
+	return s.am.Lock(addr) == nil
+}
+
+// SignAndSendTransaction will create a transaction from the given arguments and
+// tries to sign it with the key associated with args.To. If the given passwd isn't
+// able to decrypt the key it fails.
+func (s *PrivateAccountAPI) SignAndSendTransaction(ctx context.Context, args SendTxArgs, passwd string) (common.Hash, error) {
+	var err error
+	args, err = prepareSendTxArgs(ctx, args, s.b)
+	if err != nil {
+		return common.Hash{}, err
+	}
+
+	if args.Nonce == nil {
+		nonce, err := s.b.GetPoolNonce(ctx, args.From)
+		if err != nil {
+			return common.Hash{}, err
+		}
+		args.Nonce = rpc.NewHexNumber(nonce)
+	}
+
+	var tx *types.Transaction
+	if args.To == nil {
+		tx = types.NewContractCreation(args.Nonce.Uint64(), args.Value.BigInt(), args.Gas.BigInt(), args.GasPrice.BigInt(), common.FromHex(args.Data))
+	} else {
+		tx = types.NewTransaction(args.Nonce.Uint64(), *args.To, args.Value.BigInt(), args.Gas.BigInt(), args.GasPrice.BigInt(), common.FromHex(args.Data))
+	}
+
+	signature, err := s.am.SignWithPassphrase(args.From, passwd, tx.SigHash().Bytes())
+	if err != nil {
+		return common.Hash{}, err
+	}
+
+	return submitTransaction(ctx, s.b, tx, signature)
+}
+
+// PublicBlockChainAPI provides an API to access the Ethereum blockchain.
+// It offers only methods that operate on public data that is freely available to anyone.
+type PublicBlockChainAPI struct {
+	b                       Backend
+	muNewBlockSubscriptions sync.Mutex                             // protects newBlocksSubscriptions
+	newBlockSubscriptions   map[string]func(core.ChainEvent) error // callbacks for new block subscriptions
+}
+
+// NewPublicBlockChainAPI creates a new Etheruem blockchain API.
+func NewPublicBlockChainAPI(b Backend) *PublicBlockChainAPI {
+	api := &PublicBlockChainAPI{
+		b: b,
+		newBlockSubscriptions: make(map[string]func(core.ChainEvent) error),
+	}
+
+	go api.subscriptionLoop()
+
+	return api
+}
+
+// subscriptionLoop reads events from the global event mux and creates notifications for the matched subscriptions.
+func (s *PublicBlockChainAPI) subscriptionLoop() {
+	sub := s.b.EventMux().Subscribe(core.ChainEvent{})
+	for event := range sub.Chan() {
+		if chainEvent, ok := event.Data.(core.ChainEvent); ok {
+			s.muNewBlockSubscriptions.Lock()
+			for id, notifyOf := range s.newBlockSubscriptions {
+				if notifyOf(chainEvent) == rpc.ErrNotificationNotFound {
+					delete(s.newBlockSubscriptions, id)
+				}
+			}
+			s.muNewBlockSubscriptions.Unlock()
+		}
+	}
+}
+
+// BlockNumber returns the block number of the chain head.
+func (s *PublicBlockChainAPI) BlockNumber() *big.Int {
+	return s.b.HeaderByNumber(rpc.LatestBlockNumber).Number
+}
+
+// GetBalance returns the amount of wei for the given address in the state of the
+// given block number. The rpc.LatestBlockNumber and rpc.PendingBlockNumber meta
+// block numbers are also allowed.
+func (s *PublicBlockChainAPI) GetBalance(ctx context.Context, address common.Address, blockNr rpc.BlockNumber) (*big.Int, error) {
+	state, _, err := s.b.StateAndHeaderByNumber(blockNr)
+	if state == nil || err != nil {
+		return nil, err
+	}
+
+	return state.GetBalance(ctx, address)
+}
+
+// GetBlockByNumber returns the requested block. When blockNr is -1 the chain head is returned. When fullTx is true all
+// transactions in the block are returned in full detail, otherwise only the transaction hash is returned.
+func (s *PublicBlockChainAPI) GetBlockByNumber(ctx context.Context, blockNr rpc.BlockNumber, fullTx bool) (map[string]interface{}, error) {
+	block, err := s.b.BlockByNumber(ctx, blockNr)
+	if block != nil {
+		response, err := s.rpcOutputBlock(block, true, fullTx)
+		if err == nil && blockNr == rpc.PendingBlockNumber {
+			// Pending blocks need to nil out a few fields
+			for _, field := range []string{"hash", "nonce", "logsBloom", "miner"} {
+				response[field] = nil
+			}
+		}
+		return response, err
+	}
+	return nil, err
+}
+
+// GetBlockByHash returns the requested block. When fullTx is true all transactions in the block are returned in full
+// detail, otherwise only the transaction hash is returned.
+func (s *PublicBlockChainAPI) GetBlockByHash(ctx context.Context, blockHash common.Hash, fullTx bool) (map[string]interface{}, error) {
+	block, err := s.b.GetBlock(ctx, blockHash)
+	if block != nil {
+		return s.rpcOutputBlock(block, true, fullTx)
+	}
+	return nil, err
+}
+
+// GetUncleByBlockNumberAndIndex returns the uncle block for the given block hash and index. When fullTx is true
+// all transactions in the block are returned in full detail, otherwise only the transaction hash is returned.
+func (s *PublicBlockChainAPI) GetUncleByBlockNumberAndIndex(ctx context.Context, blockNr rpc.BlockNumber, index rpc.HexNumber) (map[string]interface{}, error) {
+	block, err := s.b.BlockByNumber(ctx, blockNr)
+	if block != nil {
+		uncles := block.Uncles()
+		if index.Int() < 0 || index.Int() >= len(uncles) {
+			glog.V(logger.Debug).Infof("uncle block on index %d not found for block #%d", index.Int(), blockNr)
+			return nil, nil
+		}
+		block = types.NewBlockWithHeader(uncles[index.Int()])
+		return s.rpcOutputBlock(block, false, false)
+	}
+	return nil, err
+}
+
+// GetUncleByBlockHashAndIndex returns the uncle block for the given block hash and index. When fullTx is true
+// all transactions in the block are returned in full detail, otherwise only the transaction hash is returned.
+func (s *PublicBlockChainAPI) GetUncleByBlockHashAndIndex(ctx context.Context, blockHash common.Hash, index rpc.HexNumber) (map[string]interface{}, error) {
+	block, err := s.b.GetBlock(ctx, blockHash)
+	if block != nil {
+		uncles := block.Uncles()
+		if index.Int() < 0 || index.Int() >= len(uncles) {
+			glog.V(logger.Debug).Infof("uncle block on index %d not found for block %s", index.Int(), blockHash.Hex())
+			return nil, nil
+		}
+		block = types.NewBlockWithHeader(uncles[index.Int()])
+		return s.rpcOutputBlock(block, false, false)
+	}
+	return nil, err
+}
+
+// GetUncleCountByBlockNumber returns number of uncles in the block for the given block number
+func (s *PublicBlockChainAPI) GetUncleCountByBlockNumber(ctx context.Context, blockNr rpc.BlockNumber) *rpc.HexNumber {
+	if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
+		return rpc.NewHexNumber(len(block.Uncles()))
+	}
+	return nil
+}
+
+// GetUncleCountByBlockHash returns number of uncles in the block for the given block hash
+func (s *PublicBlockChainAPI) GetUncleCountByBlockHash(ctx context.Context, blockHash common.Hash) *rpc.HexNumber {
+	if block, _ := s.b.GetBlock(ctx, blockHash); block != nil {
+		return rpc.NewHexNumber(len(block.Uncles()))
+	}
+	return nil
+}
+
+// NewBlocksArgs allows the user to specify if the returned block should include transactions and in which format.
+type NewBlocksArgs struct {
+	IncludeTransactions bool `json:"includeTransactions"`
+	TransactionDetails  bool `json:"transactionDetails"`
+}
+
+// NewBlocks triggers a new block event each time a block is appended to the chain. It accepts an argument which allows
+// the caller to specify whether the output should contain transactions and in what format.
+func (s *PublicBlockChainAPI) NewBlocks(ctx context.Context, args NewBlocksArgs) (rpc.Subscription, error) {
+	notifier, supported := rpc.NotifierFromContext(ctx)
+	if !supported {
+		return nil, rpc.ErrNotificationsUnsupported
+	}
+
+	// create a subscription that will remove itself when unsubscribed/cancelled
+	subscription, err := notifier.NewSubscription(func(subId string) {
+		s.muNewBlockSubscriptions.Lock()
+		delete(s.newBlockSubscriptions, subId)
+		s.muNewBlockSubscriptions.Unlock()
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	// add a callback that is called on chain events which will format the block and notify the client
+	s.muNewBlockSubscriptions.Lock()
+	s.newBlockSubscriptions[subscription.ID()] = func(e core.ChainEvent) error {
+		notification, err := s.rpcOutputBlock(e.Block, args.IncludeTransactions, args.TransactionDetails)
+		if err == nil {
+			return subscription.Notify(notification)
+		}
+		glog.V(logger.Warn).Info("unable to format block %v\n", err)
+		return nil
+	}
+	s.muNewBlockSubscriptions.Unlock()
+	return subscription, nil
+}
+
+// GetCode returns the code stored at the given address in the state for the given block number.
+func (s *PublicBlockChainAPI) GetCode(ctx context.Context, address common.Address, blockNr rpc.BlockNumber) (string, error) {
+	state, _, err := s.b.StateAndHeaderByNumber(blockNr)
+	if state == nil || err != nil {
+		return "", err
+	}
+	res, err := state.GetCode(ctx, address)
+	if len(res) == 0 || err != nil { // backwards compatibility
+		return "0x", err
+	}
+	return common.ToHex(res), nil
+}
+
+// GetStorageAt returns the storage from the state at the given address, key and
+// block number. The rpc.LatestBlockNumber and rpc.PendingBlockNumber meta block
+// numbers are also allowed.
+func (s *PublicBlockChainAPI) GetStorageAt(ctx context.Context, address common.Address, key string, blockNr rpc.BlockNumber) (string, error) {
+	state, _, err := s.b.StateAndHeaderByNumber(blockNr)
+	if state == nil || err != nil {
+		return "0x", err
+	}
+	res, err := state.GetState(ctx, address, common.HexToHash(key))
+	if err != nil {
+		return "0x", err
+	}
+	return res.Hex(), nil
+}
+
+// callmsg is the message type used for call transations.
+type callmsg struct {
+	addr          common.Address
+	nonce         uint64
+	to            *common.Address
+	gas, gasPrice *big.Int
+	value         *big.Int
+	data          []byte
+}
+
+// accessor boilerplate to implement core.Message
+func (m callmsg) From() (common.Address, error)         { return m.addr, nil }
+func (m callmsg) FromFrontier() (common.Address, error) { return m.addr, nil }
+func (m callmsg) Nonce() uint64                         { return m.nonce }
+func (m callmsg) To() *common.Address                   { return m.to }
+func (m callmsg) GasPrice() *big.Int                    { return m.gasPrice }
+func (m callmsg) Gas() *big.Int                         { return m.gas }
+func (m callmsg) Value() *big.Int                       { return m.value }
+func (m callmsg) Data() []byte                          { return m.data }
+
+// CallArgs represents the arguments for a call.
+type CallArgs struct {
+	From     common.Address  `json:"from"`
+	To       *common.Address `json:"to"`
+	Gas      rpc.HexNumber   `json:"gas"`
+	GasPrice rpc.HexNumber   `json:"gasPrice"`
+	Value    rpc.HexNumber   `json:"value"`
+	Data     string          `json:"data"`
+}
+
+func (s *PublicBlockChainAPI) doCall(ctx context.Context, args CallArgs, blockNr rpc.BlockNumber) (string, *big.Int, error) {
+	state, header, err := s.b.StateAndHeaderByNumber(blockNr)
+	if state == nil || err != nil {
+		return "0x", common.Big0, err
+	}
+
+	// Set the account address to interact with
+	var addr common.Address
+	if args.From == (common.Address{}) {
+		accounts := s.b.AccountManager().Accounts()
+		if len(accounts) == 0 {
+			addr = common.Address{}
+		} else {
+			addr = accounts[0].Address
+		}
+	} else {
+		addr = args.From
+	}
+
+	// Assemble the CALL invocation
+	msg := callmsg{
+		addr:     addr,
+		to:       args.To,
+		gas:      args.Gas.BigInt(),
+		gasPrice: args.GasPrice.BigInt(),
+		value:    args.Value.BigInt(),
+		data:     common.FromHex(args.Data),
+	}
+
+	if msg.gas.Cmp(common.Big0) == 0 {
+		msg.gas = big.NewInt(50000000)
+	}
+
+	if msg.gasPrice.Cmp(common.Big0) == 0 {
+		msg.gasPrice = new(big.Int).Mul(big.NewInt(50), common.Shannon)
+	}
+
+	// Execute the call and return
+	vmenv, vmError, err := s.b.GetVMEnv(ctx, msg, state, header)
+	if err != nil {
+		return "0x", common.Big0, err
+	}
+	gp := new(core.GasPool).AddGas(common.MaxBig)
+	res, gas, err := core.ApplyMessage(vmenv, msg, gp)
+	if err := vmError(); err != nil {
+		return "0x", common.Big0, err
+	}
+	if len(res) == 0 { // backwards compatability
+		return "0x", gas, err
+	}
+	return common.ToHex(res), gas, err
+}
+
+// Call executes the given transaction on the state for the given block number.
+// It doesn't make and changes in the state/blockchain and is usefull to execute and retrieve values.
+func (s *PublicBlockChainAPI) Call(ctx context.Context, args CallArgs, blockNr rpc.BlockNumber) (string, error) {
+	result, _, err := s.doCall(ctx, args, blockNr)
+	return result, err
+}
+
+// EstimateGas returns an estimate of the amount of gas needed to execute the given transaction.
+func (s *PublicBlockChainAPI) EstimateGas(ctx context.Context, args CallArgs) (*rpc.HexNumber, error) {
+	_, gas, err := s.doCall(ctx, args, rpc.PendingBlockNumber)
+	return rpc.NewHexNumber(gas), err
+}
+
+// ExecutionResult groups all structured logs emitted by the EVM
+// while replaying a transaction in debug mode as well as the amount of
+// gas used and the return value
+type ExecutionResult struct {
+	Gas         *big.Int       `json:"gas"`
+	ReturnValue string         `json:"returnValue"`
+	StructLogs  []StructLogRes `json:"structLogs"`
+}
+
+// StructLogRes stores a structured log emitted by the EVM while replaying a
+// transaction in debug mode
+type StructLogRes struct {
+	Pc      uint64            `json:"pc"`
+	Op      string            `json:"op"`
+	Gas     *big.Int          `json:"gas"`
+	GasCost *big.Int          `json:"gasCost"`
+	Depth   int               `json:"depth"`
+	Error   error             `json:"error"`
+	Stack   []string          `json:"stack"`
+	Memory  []string          `json:"memory"`
+	Storage map[string]string `json:"storage"`
+}
+
+// formatLogs formats EVM returned structured logs for json output
+func FormatLogs(structLogs []vm.StructLog) []StructLogRes {
+	formattedStructLogs := make([]StructLogRes, len(structLogs))
+	for index, trace := range structLogs {
+		formattedStructLogs[index] = StructLogRes{
+			Pc:      trace.Pc,
+			Op:      trace.Op.String(),
+			Gas:     trace.Gas,
+			GasCost: trace.GasCost,
+			Depth:   trace.Depth,
+			Error:   trace.Err,
+			Stack:   make([]string, len(trace.Stack)),
+			Storage: make(map[string]string),
+		}
+
+		for i, stackValue := range trace.Stack {
+			formattedStructLogs[index].Stack[i] = fmt.Sprintf("%x", common.LeftPadBytes(stackValue.Bytes(), 32))
+		}
+
+		for i := 0; i+32 <= len(trace.Memory); i += 32 {
+			formattedStructLogs[index].Memory = append(formattedStructLogs[index].Memory, fmt.Sprintf("%x", trace.Memory[i:i+32]))
+		}
+
+		for i, storageValue := range trace.Storage {
+			formattedStructLogs[index].Storage[fmt.Sprintf("%x", i)] = fmt.Sprintf("%x", storageValue)
+		}
+	}
+	return formattedStructLogs
+}
+
+// TraceCall executes a call and returns the amount of gas, created logs and optionally returned values.
+func (s *PublicBlockChainAPI) TraceCall(ctx context.Context, args CallArgs, blockNr rpc.BlockNumber) (*ExecutionResult, error) {
+	state, header, err := s.b.StateAndHeaderByNumber(blockNr)
+	if state == nil || err != nil {
+		return nil, err
+	}
+
+	var addr common.Address
+	if args.From == (common.Address{}) {
+		accounts := s.b.AccountManager().Accounts()
+		if len(accounts) == 0 {
+			addr = common.Address{}
+		} else {
+			addr = accounts[0].Address
+		}
+	} else {
+		addr = args.From
+	}
+
+	// Assemble the CALL invocation
+	msg := callmsg{
+		addr:     addr,
+		to:       args.To,
+		gas:      args.Gas.BigInt(),
+		gasPrice: args.GasPrice.BigInt(),
+		value:    args.Value.BigInt(),
+		data:     common.FromHex(args.Data),
+	}
+
+	if msg.gas.Cmp(common.Big0) == 0 {
+		msg.gas = big.NewInt(50000000)
+	}
+
+	if msg.gasPrice.Cmp(common.Big0) == 0 {
+		msg.gasPrice = new(big.Int).Mul(big.NewInt(50), common.Shannon)
+	}
+
+	// Execute the call and return
+	vmenv, vmError, err := s.b.GetVMEnv(ctx, msg, state, header)
+	if err != nil {
+		return nil, err
+	}
+	gp := new(core.GasPool).AddGas(common.MaxBig)
+	ret, gas, err := core.ApplyMessage(vmenv, msg, gp)
+	if err := vmError(); err != nil {
+		return nil, err
+	}
+	return &ExecutionResult{
+		Gas:         gas,
+		ReturnValue: fmt.Sprintf("%x", ret),
+		StructLogs:  FormatLogs(vmenv.StructLogs()),
+	}, nil
+}
+
+// rpcOutputBlock converts the given block to the RPC output which depends on fullTx. If inclTx is true transactions are
+// returned. When fullTx is true the returned block contains full transaction details, otherwise it will only contain
+// transaction hashes.
+func (s *PublicBlockChainAPI) rpcOutputBlock(b *types.Block, inclTx bool, fullTx bool) (map[string]interface{}, error) {
+	fields := map[string]interface{}{
+		"number":           rpc.NewHexNumber(b.Number()),
+		"hash":             b.Hash(),
+		"parentHash":       b.ParentHash(),
+		"nonce":            b.Header().Nonce,
+		"sha3Uncles":       b.UncleHash(),
+		"logsBloom":        b.Bloom(),
+		"stateRoot":        b.Root(),
+		"miner":            b.Coinbase(),
+		"difficulty":       rpc.NewHexNumber(b.Difficulty()),
+		"totalDifficulty":  rpc.NewHexNumber(s.b.GetTd(b.Hash())),
+		"extraData":        fmt.Sprintf("0x%x", b.Extra()),
+		"size":             rpc.NewHexNumber(b.Size().Int64()),
+		"gasLimit":         rpc.NewHexNumber(b.GasLimit()),
+		"gasUsed":          rpc.NewHexNumber(b.GasUsed()),
+		"timestamp":        rpc.NewHexNumber(b.Time()),
+		"transactionsRoot": b.TxHash(),
+		"receiptRoot":      b.ReceiptHash(),
+	}
+
+	if inclTx {
+		formatTx := func(tx *types.Transaction) (interface{}, error) {
+			return tx.Hash(), nil
+		}
+
+		if fullTx {
+			formatTx = func(tx *types.Transaction) (interface{}, error) {
+				return newRPCTransaction(b, tx.Hash())
+			}
+		}
+
+		txs := b.Transactions()
+		transactions := make([]interface{}, len(txs))
+		var err error
+		for i, tx := range b.Transactions() {
+			if transactions[i], err = formatTx(tx); err != nil {
+				return nil, err
+			}
+		}
+		fields["transactions"] = transactions
+	}
+
+	uncles := b.Uncles()
+	uncleHashes := make([]common.Hash, len(uncles))
+	for i, uncle := range uncles {
+		uncleHashes[i] = uncle.Hash()
+	}
+	fields["uncles"] = uncleHashes
+
+	return fields, nil
+}
+
+// RPCTransaction represents a transaction that will serialize to the RPC representation of a transaction
+type RPCTransaction struct {
+	BlockHash        common.Hash     `json:"blockHash"`
+	BlockNumber      *rpc.HexNumber  `json:"blockNumber"`
+	From             common.Address  `json:"from"`
+	Gas              *rpc.HexNumber  `json:"gas"`
+	GasPrice         *rpc.HexNumber  `json:"gasPrice"`
+	Hash             common.Hash     `json:"hash"`
+	Input            string          `json:"input"`
+	Nonce            *rpc.HexNumber  `json:"nonce"`
+	To               *common.Address `json:"to"`
+	TransactionIndex *rpc.HexNumber  `json:"transactionIndex"`
+	Value            *rpc.HexNumber  `json:"value"`
+}
+
+// newRPCPendingTransaction returns a pending transaction that will serialize to the RPC representation
+func newRPCPendingTransaction(tx *types.Transaction) *RPCTransaction {
+	from, _ := tx.FromFrontier()
+
+	return &RPCTransaction{
+		From:     from,
+		Gas:      rpc.NewHexNumber(tx.Gas()),
+		GasPrice: rpc.NewHexNumber(tx.GasPrice()),
+		Hash:     tx.Hash(),
+		Input:    fmt.Sprintf("0x%x", tx.Data()),
+		Nonce:    rpc.NewHexNumber(tx.Nonce()),
+		To:       tx.To(),
+		Value:    rpc.NewHexNumber(tx.Value()),
+	}
+}
+
+// newRPCTransaction returns a transaction that will serialize to the RPC representation.
+func newRPCTransactionFromBlockIndex(b *types.Block, txIndex int) (*RPCTransaction, error) {
+	if txIndex >= 0 && txIndex < len(b.Transactions()) {
+		tx := b.Transactions()[txIndex]
+		from, err := tx.FromFrontier()
+		if err != nil {
+			return nil, err
+		}
+
+		return &RPCTransaction{
+			BlockHash:        b.Hash(),
+			BlockNumber:      rpc.NewHexNumber(b.Number()),
+			From:             from,
+			Gas:              rpc.NewHexNumber(tx.Gas()),
+			GasPrice:         rpc.NewHexNumber(tx.GasPrice()),
+			Hash:             tx.Hash(),
+			Input:            fmt.Sprintf("0x%x", tx.Data()),
+			Nonce:            rpc.NewHexNumber(tx.Nonce()),
+			To:               tx.To(),
+			TransactionIndex: rpc.NewHexNumber(txIndex),
+			Value:            rpc.NewHexNumber(tx.Value()),
+		}, nil
+	}
+
+	return nil, nil
+}
+
+// newRPCTransaction returns a transaction that will serialize to the RPC representation.
+func newRPCTransaction(b *types.Block, txHash common.Hash) (*RPCTransaction, error) {
+	for idx, tx := range b.Transactions() {
+		if tx.Hash() == txHash {
+			return newRPCTransactionFromBlockIndex(b, idx)
+		}
+	}
+
+	return nil, nil
+}
+
+// PublicTransactionPoolAPI exposes methods for the RPC interface
+type PublicTransactionPoolAPI struct {
+	b               Backend
+	muPendingTxSubs sync.Mutex
+	pendingTxSubs   map[string]rpc.Subscription
+}
+
+// NewPublicTransactionPoolAPI creates a new RPC service with methods specific for the transaction pool.
+func NewPublicTransactionPoolAPI(b Backend) *PublicTransactionPoolAPI {
+	api := &PublicTransactionPoolAPI{
+		b:             b,
+		pendingTxSubs: make(map[string]rpc.Subscription),
+	}
+
+	go api.subscriptionLoop()
+
+	return api
+}
+
+// subscriptionLoop listens for events on the global event mux and creates notifications for subscriptions.
+func (s *PublicTransactionPoolAPI) subscriptionLoop() {
+	sub := s.b.EventMux().Subscribe(core.TxPreEvent{})
+	for event := range sub.Chan() {
+		tx := event.Data.(core.TxPreEvent)
+		if from, err := tx.Tx.FromFrontier(); err == nil {
+			if s.b.AccountManager().HasAddress(from) {
+				s.muPendingTxSubs.Lock()
+				for id, sub := range s.pendingTxSubs {
+					if sub.Notify(tx.Tx.Hash()) == rpc.ErrNotificationNotFound {
+						delete(s.pendingTxSubs, id)
+					}
+				}
+				s.muPendingTxSubs.Unlock()
+			}
+		}
+	}
+}
+
+func getTransaction(chainDb ethdb.Database, b Backend, txHash common.Hash) (*types.Transaction, bool, error) {
+	txData, err := chainDb.Get(txHash.Bytes())
+	isPending := false
+	tx := new(types.Transaction)
+
+	if err == nil && len(txData) > 0 {
+		if err := rlp.DecodeBytes(txData, tx); err != nil {
+			return nil, isPending, err
+		}
+	} else {
+		// pending transaction?
+		tx = b.GetPoolTransaction(txHash)
+		isPending = true
+	}
+
+	return tx, isPending, nil
+}
+
+// GetBlockTransactionCountByNumber returns the number of transactions in the block with the given block number.
+func (s *PublicTransactionPoolAPI) GetBlockTransactionCountByNumber(ctx context.Context, blockNr rpc.BlockNumber) *rpc.HexNumber {
+	if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
+		return rpc.NewHexNumber(len(block.Transactions()))
+	}
+	return nil
+}
+
+// GetBlockTransactionCountByHash returns the number of transactions in the block with the given hash.
+func (s *PublicTransactionPoolAPI) GetBlockTransactionCountByHash(ctx context.Context, blockHash common.Hash) *rpc.HexNumber {
+	if block, _ := s.b.GetBlock(ctx, blockHash); block != nil {
+		return rpc.NewHexNumber(len(block.Transactions()))
+	}
+	return nil
+}
+
+// GetTransactionByBlockNumberAndIndex returns the transaction for the given block number and index.
+func (s *PublicTransactionPoolAPI) GetTransactionByBlockNumberAndIndex(ctx context.Context, blockNr rpc.BlockNumber, index rpc.HexNumber) (*RPCTransaction, error) {
+	if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
+		return newRPCTransactionFromBlockIndex(block, index.Int())
+	}
+	return nil, nil
+}
+
+// GetTransactionByBlockHashAndIndex returns the transaction for the given block hash and index.
+func (s *PublicTransactionPoolAPI) GetTransactionByBlockHashAndIndex(ctx context.Context, blockHash common.Hash, index rpc.HexNumber) (*RPCTransaction, error) {
+	if block, _ := s.b.GetBlock(ctx, blockHash); block != nil {
+		return newRPCTransactionFromBlockIndex(block, index.Int())
+	}
+	return nil, nil
+}
+
+// GetTransactionCount returns the number of transactions the given address has sent for the given block number
+func (s *PublicTransactionPoolAPI) GetTransactionCount(ctx context.Context, address common.Address, blockNr rpc.BlockNumber) (*rpc.HexNumber, error) {
+	state, _, err := s.b.StateAndHeaderByNumber(blockNr)
+	if state == nil || err != nil {
+		return nil, err
+	}
+	nonce, err := state.GetNonce(ctx, address)
+	if err != nil {
+		return nil, err
+	}
+	return rpc.NewHexNumber(nonce), nil
+}
+
+// getTransactionBlockData fetches the meta data for the given transaction from the chain database. This is useful to
+// retrieve block information for a hash. It returns the block hash, block index and transaction index.
+func getTransactionBlockData(chainDb ethdb.Database, txHash common.Hash) (common.Hash, uint64, uint64, error) {
+	var txBlock struct {
+		BlockHash  common.Hash
+		BlockIndex uint64
+		Index      uint64
+	}
+
+	blockData, err := chainDb.Get(append(txHash.Bytes(), 0x0001))
+	if err != nil {
+		return common.Hash{}, uint64(0), uint64(0), err
+	}
+
+	reader := bytes.NewReader(blockData)
+	if err = rlp.Decode(reader, &txBlock); err != nil {
+		return common.Hash{}, uint64(0), uint64(0), err
+	}
+
+	return txBlock.BlockHash, txBlock.BlockIndex, txBlock.Index, nil
+}
+
+// GetTransactionByHash returns the transaction for the given hash
+func (s *PublicTransactionPoolAPI) GetTransactionByHash(ctx context.Context, txHash common.Hash) (*RPCTransaction, error) {
+	var tx *types.Transaction
+	var isPending bool
+	var err error
+
+	if tx, isPending, err = getTransaction(s.b.ChainDb(), s.b, txHash); err != nil {
+		glog.V(logger.Debug).Infof("%v\n", err)
+		return nil, nil
+	} else if tx == nil {
+		return nil, nil
+	}
+
+	if isPending {
+		return newRPCPendingTransaction(tx), nil
+	}
+
+	blockHash, _, _, err := getTransactionBlockData(s.b.ChainDb(), txHash)
+	if err != nil {
+		glog.V(logger.Debug).Infof("%v\n", err)
+		return nil, nil
+	}
+
+	if block, _ := s.b.GetBlock(ctx, blockHash); block != nil {
+		return newRPCTransaction(block, txHash)
+	}
+
+	return nil, nil
+}
+
+// GetTransactionReceipt returns the transaction receipt for the given transaction hash.
+func (s *PublicTransactionPoolAPI) GetTransactionReceipt(txHash common.Hash) (map[string]interface{}, error) {
+	receipt := core.GetReceipt(s.b.ChainDb(), txHash)
+	if receipt == nil {
+		glog.V(logger.Debug).Infof("receipt not found for transaction %s", txHash.Hex())
+		return nil, nil
+	}
+
+	tx, _, err := getTransaction(s.b.ChainDb(), s.b, txHash)
+	if err != nil {
+		glog.V(logger.Debug).Infof("%v\n", err)
+		return nil, nil
+	}
+
+	txBlock, blockIndex, index, err := getTransactionBlockData(s.b.ChainDb(), txHash)
+	if err != nil {
+		glog.V(logger.Debug).Infof("%v\n", err)
+		return nil, nil
+	}
+
+	from, err := tx.FromFrontier()
+	if err != nil {
+		glog.V(logger.Debug).Infof("%v\n", err)
+		return nil, nil
+	}
+
+	fields := map[string]interface{}{
+		"root":              common.Bytes2Hex(receipt.PostState),
+		"blockHash":         txBlock,
+		"blockNumber":       rpc.NewHexNumber(blockIndex),
+		"transactionHash":   txHash,
+		"transactionIndex":  rpc.NewHexNumber(index),
+		"from":              from,
+		"to":                tx.To(),
+		"gasUsed":           rpc.NewHexNumber(receipt.GasUsed),
+		"cumulativeGasUsed": rpc.NewHexNumber(receipt.CumulativeGasUsed),
+		"contractAddress":   nil,
+		"logs":              receipt.Logs,
+	}
+
+	if receipt.Logs == nil {
+		fields["logs"] = []vm.Logs{}
+	}
+
+	// If the ContractAddress is 20 0x0 bytes, assume it is not a contract creation
+	if bytes.Compare(receipt.ContractAddress.Bytes(), bytes.Repeat([]byte{0}, 20)) != 0 {
+		fields["contractAddress"] = receipt.ContractAddress
+	}
+
+	return fields, nil
+}
+
+// sign is a helper function that signs a transaction with the private key of the given address.
+func (s *PublicTransactionPoolAPI) sign(addr common.Address, tx *types.Transaction) (*types.Transaction, error) {
+	signature, err := s.b.AccountManager().Sign(addr, tx.SigHash().Bytes())
+	if err != nil {
+		return nil, err
+	}
+	return tx.WithSignature(signature)
+}
+
+// SendTxArgs represents the arguments to sumbit a new transaction into the transaction pool.
+type SendTxArgs struct {
+	From     common.Address  `json:"from"`
+	To       *common.Address `json:"to"`
+	Gas      *rpc.HexNumber  `json:"gas"`
+	GasPrice *rpc.HexNumber  `json:"gasPrice"`
+	Value    *rpc.HexNumber  `json:"value"`
+	Data     string          `json:"data"`
+	Nonce    *rpc.HexNumber  `json:"nonce"`
+}
+
+// prepareSendTxArgs is a helper function that fills in default values for unspecified tx fields.
+func prepareSendTxArgs(ctx context.Context, args SendTxArgs, b Backend) (SendTxArgs, error) {
+	if args.Gas == nil {
+		args.Gas = rpc.NewHexNumber(defaultGas)
+	}
+	if args.GasPrice == nil {
+		price, err := b.SuggestPrice(ctx)
+		if err != nil {
+			return args, err
+		}
+		args.GasPrice = rpc.NewHexNumber(price)
+	}
+	if args.Value == nil {
+		args.Value = rpc.NewHexNumber(0)
+	}
+	return args, nil
+}
+
+// submitTransaction is a helper function that submits tx to txPool and creates a log entry.
+func submitTransaction(ctx context.Context, b Backend, tx *types.Transaction, signature []byte) (common.Hash, error) {
+	signedTx, err := tx.WithSignature(signature)
+	if err != nil {
+		return common.Hash{}, err
+	}
+
+	if err := b.SendTx(ctx, signedTx); err != nil {
+		return common.Hash{}, err
+	}
+
+	if signedTx.To() == nil {
+		from, _ := signedTx.From()
+		addr := crypto.CreateAddress(from, signedTx.Nonce())
+		glog.V(logger.Info).Infof("Tx(%s) created: %s\n", signedTx.Hash().Hex(), addr.Hex())
+	} else {
+		glog.V(logger.Info).Infof("Tx(%s) to: %s\n", signedTx.Hash().Hex(), tx.To().Hex())
+	}
+
+	return signedTx.Hash(), nil
+}
+
+// SendTransaction creates a transaction for the given argument, sign it and submit it to the
+// transaction pool.
+func (s *PublicTransactionPoolAPI) SendTransaction(ctx context.Context, args SendTxArgs) (common.Hash, error) {
+	var err error
+	args, err = prepareSendTxArgs(ctx, args, s.b)
+	if err != nil {
+		return common.Hash{}, err
+	}
+
+	if args.Nonce == nil {
+		nonce, err := s.b.GetPoolNonce(ctx, args.From)
+		if err != nil {
+			return common.Hash{}, err
+		}
+		args.Nonce = rpc.NewHexNumber(nonce)
+	}
+
+	var tx *types.Transaction
+	if args.To == nil {
+		tx = types.NewContractCreation(args.Nonce.Uint64(), args.Value.BigInt(), args.Gas.BigInt(), args.GasPrice.BigInt(), common.FromHex(args.Data))
+	} else {
+		tx = types.NewTransaction(args.Nonce.Uint64(), *args.To, args.Value.BigInt(), args.Gas.BigInt(), args.GasPrice.BigInt(), common.FromHex(args.Data))
+	}
+
+	signature, err := s.b.AccountManager().Sign(args.From, tx.SigHash().Bytes())
+	if err != nil {
+		return common.Hash{}, err
+	}
+
+	return submitTransaction(ctx, s.b, tx, signature)
+}
+
+// SendRawTransaction will add the signed transaction to the transaction pool.
+// The sender is responsible for signing the transaction and using the correct nonce.
+func (s *PublicTransactionPoolAPI) SendRawTransaction(ctx context.Context, encodedTx string) (string, error) {
+	tx := new(types.Transaction)
+	if err := rlp.DecodeBytes(common.FromHex(encodedTx), tx); err != nil {
+		return "", err
+	}
+
+	if err := s.b.SendTx(ctx, tx); err != nil {
+		return "", err
+	}
+
+	if tx.To() == nil {
+		from, err := tx.FromFrontier()
+		if err != nil {
+			return "", err
+		}
+		addr := crypto.CreateAddress(from, tx.Nonce())
+		glog.V(logger.Info).Infof("Tx(%x) created: %x\n", tx.Hash(), addr)
+	} else {
+		glog.V(logger.Info).Infof("Tx(%x) to: %x\n", tx.Hash(), tx.To())
+	}
+
+	return tx.Hash().Hex(), nil
+}
+
+// Sign signs the given hash using the key that matches the address. The key must be
+// unlocked in order to sign the hash.
+func (s *PublicTransactionPoolAPI) Sign(addr common.Address, hash common.Hash) (string, error) {
+	signature, error := s.b.AccountManager().Sign(addr, hash[:])
+	return common.ToHex(signature), error
+}
+
+// SignTransactionArgs represents the arguments to sign a transaction.
+type SignTransactionArgs struct {
+	From     common.Address
+	To       *common.Address
+	Nonce    *rpc.HexNumber
+	Value    *rpc.HexNumber
+	Gas      *rpc.HexNumber
+	GasPrice *rpc.HexNumber
+	Data     string
+
+	BlockNumber int64
+}
+
+// Tx is a helper object for argument and return values
+type Tx struct {
+	tx *types.Transaction
+
+	To       *common.Address `json:"to"`
+	From     common.Address  `json:"from"`
+	Nonce    *rpc.HexNumber  `json:"nonce"`
+	Value    *rpc.HexNumber  `json:"value"`
+	Data     string          `json:"data"`
+	GasLimit *rpc.HexNumber  `json:"gas"`
+	GasPrice *rpc.HexNumber  `json:"gasPrice"`
+	Hash     common.Hash     `json:"hash"`
+}
+
+// UnmarshalJSON parses JSON data into tx.
+func (tx *Tx) UnmarshalJSON(b []byte) (err error) {
+	req := struct {
+		To       *common.Address `json:"to"`
+		From     common.Address  `json:"from"`
+		Nonce    *rpc.HexNumber  `json:"nonce"`
+		Value    *rpc.HexNumber  `json:"value"`
+		Data     string          `json:"data"`
+		GasLimit *rpc.HexNumber  `json:"gas"`
+		GasPrice *rpc.HexNumber  `json:"gasPrice"`
+		Hash     common.Hash     `json:"hash"`
+	}{}
+
+	if err := json.Unmarshal(b, &req); err != nil {
+		return err
+	}
+
+	tx.To = req.To
+	tx.From = req.From
+	tx.Nonce = req.Nonce
+	tx.Value = req.Value
+	tx.Data = req.Data
+	tx.GasLimit = req.GasLimit
+	tx.GasPrice = req.GasPrice
+	tx.Hash = req.Hash
+
+	data := common.Hex2Bytes(tx.Data)
+
+	if tx.Nonce == nil {
+		return fmt.Errorf("need nonce")
+	}
+	if tx.Value == nil {
+		tx.Value = rpc.NewHexNumber(0)
+	}
+	if tx.GasLimit == nil {
+		tx.GasLimit = rpc.NewHexNumber(0)
+	}
+	if tx.GasPrice == nil {
+		tx.GasPrice = rpc.NewHexNumber(int64(50000000000))
+	}
+
+	if req.To == nil {
+		tx.tx = types.NewContractCreation(tx.Nonce.Uint64(), tx.Value.BigInt(), tx.GasLimit.BigInt(), tx.GasPrice.BigInt(), data)
+	} else {
+		tx.tx = types.NewTransaction(tx.Nonce.Uint64(), *tx.To, tx.Value.BigInt(), tx.GasLimit.BigInt(), tx.GasPrice.BigInt(), data)
+	}
+
+	return nil
+}
+
+// SignTransactionResult represents a RLP encoded signed transaction.
+type SignTransactionResult struct {
+	Raw string `json:"raw"`
+	Tx  *Tx    `json:"tx"`
+}
+
+func newTx(t *types.Transaction) *Tx {
+	from, _ := t.FromFrontier()
+	return &Tx{
+		tx:       t,
+		To:       t.To(),
+		From:     from,
+		Value:    rpc.NewHexNumber(t.Value()),
+		Nonce:    rpc.NewHexNumber(t.Nonce()),
+		Data:     "0x" + common.Bytes2Hex(t.Data()),
+		GasLimit: rpc.NewHexNumber(t.Gas()),
+		GasPrice: rpc.NewHexNumber(t.GasPrice()),
+		Hash:     t.Hash(),
+	}
+}
+
+// SignTransaction will sign the given transaction with the from account.
+// The node needs to have the private key of the account corresponding with
+// the given from address and it needs to be unlocked.
+func (s *PublicTransactionPoolAPI) SignTransaction(ctx context.Context, args SignTransactionArgs) (*SignTransactionResult, error) {
+	if args.Gas == nil {
+		args.Gas = rpc.NewHexNumber(defaultGas)
+	}
+	if args.GasPrice == nil {
+		price, err := s.b.SuggestPrice(ctx)
+		if err != nil {
+			return nil, err
+		}
+		args.GasPrice = rpc.NewHexNumber(price)
+	}
+	if args.Value == nil {
+		args.Value = rpc.NewHexNumber(0)
+	}
+
+	if args.Nonce == nil {
+		nonce, err := s.b.GetPoolNonce(ctx, args.From)
+		if err != nil {
+			return nil, err
+		}
+		args.Nonce = rpc.NewHexNumber(nonce)
+	}
+
+	var tx *types.Transaction
+	if args.To == nil {
+		tx = types.NewContractCreation(args.Nonce.Uint64(), args.Value.BigInt(), args.Gas.BigInt(), args.GasPrice.BigInt(), common.FromHex(args.Data))
+	} else {
+		tx = types.NewTransaction(args.Nonce.Uint64(), *args.To, args.Value.BigInt(), args.Gas.BigInt(), args.GasPrice.BigInt(), common.FromHex(args.Data))
+	}
+
+	signedTx, err := s.sign(args.From, tx)
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := rlp.EncodeToBytes(signedTx)
+	if err != nil {
+		return nil, err
+	}
+
+	return &SignTransactionResult{"0x" + common.Bytes2Hex(data), newTx(signedTx)}, nil
+}
+
+// PendingTransactions returns the transactions that are in the transaction pool and have a from address that is one of
+// the accounts this node manages.
+func (s *PublicTransactionPoolAPI) PendingTransactions() []*RPCTransaction {
+	pending := s.b.GetPoolTransactions()
+	transactions := make([]*RPCTransaction, 0, len(pending))
+	for _, tx := range pending {
+		from, _ := tx.FromFrontier()
+		if s.b.AccountManager().HasAddress(from) {
+			transactions = append(transactions, newRPCPendingTransaction(tx))
+		}
+	}
+	return transactions
+}
+
+// NewPendingTransactions creates a subscription that is triggered each time a transaction enters the transaction pool
+// and is send from one of the transactions this nodes manages.
+func (s *PublicTransactionPoolAPI) NewPendingTransactions(ctx context.Context) (rpc.Subscription, error) {
+	notifier, supported := rpc.NotifierFromContext(ctx)
+	if !supported {
+		return nil, rpc.ErrNotificationsUnsupported
+	}
+
+	subscription, err := notifier.NewSubscription(func(id string) {
+		s.muPendingTxSubs.Lock()
+		delete(s.pendingTxSubs, id)
+		s.muPendingTxSubs.Unlock()
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	s.muPendingTxSubs.Lock()
+	s.pendingTxSubs[subscription.ID()] = subscription
+	s.muPendingTxSubs.Unlock()
+
+	return subscription, nil
+}
+
+// Resend accepts an existing transaction and a new gas price and limit. It will remove the given transaction from the
+// pool and reinsert it with the new gas price and limit.
+func (s *PublicTransactionPoolAPI) Resend(ctx context.Context, tx *Tx, gasPrice, gasLimit *rpc.HexNumber) (common.Hash, error) {
+
+	pending := s.b.GetPoolTransactions()
+	for _, p := range pending {
+		if pFrom, err := p.FromFrontier(); err == nil && pFrom == tx.From && p.SigHash() == tx.tx.SigHash() {
+			if gasPrice == nil {
+				gasPrice = rpc.NewHexNumber(tx.tx.GasPrice())
+			}
+			if gasLimit == nil {
+				gasLimit = rpc.NewHexNumber(tx.tx.Gas())
+			}
+
+			var newTx *types.Transaction
+			if tx.tx.To() == nil {
+				newTx = types.NewContractCreation(tx.tx.Nonce(), tx.tx.Value(), gasPrice.BigInt(), gasLimit.BigInt(), tx.tx.Data())
+			} else {
+				newTx = types.NewTransaction(tx.tx.Nonce(), *tx.tx.To(), tx.tx.Value(), gasPrice.BigInt(), gasLimit.BigInt(), tx.tx.Data())
+			}
+
+			signedTx, err := s.sign(tx.From, newTx)
+			if err != nil {
+				return common.Hash{}, err
+			}
+
+			s.b.RemoveTx(tx.Hash)
+			if err = s.b.SendTx(ctx, signedTx); err != nil {
+				return common.Hash{}, err
+			}
+
+			return signedTx.Hash(), nil
+		}
+	}
+
+	return common.Hash{}, fmt.Errorf("Transaction %#x not found", tx.Hash)
+}
+
+// PrivateAdminAPI is the collection of Etheruem APIs exposed over the private
+// admin endpoint.
+type PrivateAdminAPI struct {
+	b        Backend
+	solcPath *string
+	solc     **compiler.Solidity
+}
+
+// NewPrivateAdminAPI creates a new API definition for the private admin methods
+// of the Ethereum service.
+func NewPrivateAdminAPI(b Backend, solcPath *string, solc **compiler.Solidity) *PrivateAdminAPI {
+	return &PrivateAdminAPI{b, solcPath, solc}
+}
+
+// SetSolc sets the Solidity compiler path to be used by the node.
+func (api *PrivateAdminAPI) SetSolc(path string) (string, error) {
+	var err error
+	*api.solcPath = path
+	*api.solc, err = compiler.New(path)
+	if err != nil {
+		return "", err
+	}
+	return (*api.solc).Info(), nil
+}
+
+// PublicDebugAPI is the collection of Etheruem APIs exposed over the public
+// debugging endpoint.
+type PublicDebugAPI struct {
+	b Backend
+}
+
+// NewPublicDebugAPI creates a new API definition for the public debug methods
+// of the Ethereum service.
+func NewPublicDebugAPI(b Backend) *PublicDebugAPI {
+	return &PublicDebugAPI{b: b}
+}
+
+// GetBlockRlp retrieves the RLP encoded for of a single block.
+func (api *PublicDebugAPI) GetBlockRlp(ctx context.Context, number uint64) (string, error) {
+	block, _ := api.b.BlockByNumber(ctx, rpc.BlockNumber(number))
+	if block == nil {
+		return "", fmt.Errorf("block #%d not found", number)
+	}
+	encoded, err := rlp.EncodeToBytes(block)
+	if err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("%x", encoded), nil
+}
+
+// PrintBlock retrieves a block and returns its pretty printed form.
+func (api *PublicDebugAPI) PrintBlock(ctx context.Context, number uint64) (string, error) {
+	block, _ := api.b.BlockByNumber(ctx, rpc.BlockNumber(number))
+	if block == nil {
+		return "", fmt.Errorf("block #%d not found", number)
+	}
+	return fmt.Sprintf("%s", block), nil
+}
+
+// SeedHash retrieves the seed hash of a block.
+func (api *PublicDebugAPI) SeedHash(ctx context.Context, number uint64) (string, error) {
+	block, _ := api.b.BlockByNumber(ctx, rpc.BlockNumber(number))
+	if block == nil {
+		return "", fmt.Errorf("block #%d not found", number)
+	}
+	hash, err := ethash.GetSeedHash(number)
+	if err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("0x%x", hash), nil
+}
+
+// PrivateDebugAPI is the collection of Etheruem APIs exposed over the private
+// debugging endpoint.
+type PrivateDebugAPI struct {
+	b Backend
+}
+
+// NewPrivateDebugAPI creates a new API definition for the private debug methods
+// of the Ethereum service.
+func NewPrivateDebugAPI(b Backend) *PrivateDebugAPI {
+	return &PrivateDebugAPI{b: b}
+}
+
+// ChaindbProperty returns leveldb properties of the chain database.
+func (api *PrivateDebugAPI) ChaindbProperty(property string) (string, error) {
+	ldb, ok := api.b.ChainDb().(interface {
+		LDB() *leveldb.DB
+	})
+	if !ok {
+		return "", fmt.Errorf("chaindbProperty does not work for memory databases")
+	}
+	if property == "" {
+		property = "leveldb.stats"
+	} else if !strings.HasPrefix(property, "leveldb.") {
+		property = "leveldb." + property
+	}
+	return ldb.LDB().GetProperty(property)
+}
+
+// SetHead rewinds the head of the blockchain to a previous block.
+func (api *PrivateDebugAPI) SetHead(number uint64) {
+	api.b.SetHead(number)
+}
+
+// PublicNetAPI offers network related RPC methods
+type PublicNetAPI struct {
+	net            *p2p.Server
+	networkVersion int
+}
+
+// NewPublicNetAPI creates a new net API instance.
+func NewPublicNetAPI(net *p2p.Server, networkVersion int) *PublicNetAPI {
+	return &PublicNetAPI{net, networkVersion}
+}
+
+// Listening returns an indication if the node is listening for network connections.
+func (s *PublicNetAPI) Listening() bool {
+	return true // always listening
+}
+
+// PeerCount returns the number of connected peers
+func (s *PublicNetAPI) PeerCount() *rpc.HexNumber {
+	return rpc.NewHexNumber(s.net.PeerCount())
+}
+
+// Version returns the current ethereum protocol version.
+func (s *PublicNetAPI) Version() string {
+	return fmt.Sprintf("%d", s.networkVersion)
+}
diff --git a/internal/ethapi/backend.go b/internal/ethapi/backend.go
new file mode 100644
index 000000000..d112a6aef
--- /dev/null
+++ b/internal/ethapi/backend.go
@@ -0,0 +1,119 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Package ethapi implements the general Ethereum API functions.
+package ethapi
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/compiler"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/eth/downloader"
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/event"
+	"github.com/ethereum/go-ethereum/rpc"
+	"golang.org/x/net/context"
+)
+
+// Backend interface provides the common API services (that are provided by
+// both full and light clients) with access to necessary functions.
+type Backend interface {
+	// general Ethereum API
+	Downloader() *downloader.Downloader
+	ProtocolVersion() int
+	SuggestPrice(ctx context.Context) (*big.Int, error)
+	ChainDb() ethdb.Database
+	EventMux() *event.TypeMux
+	AccountManager() *accounts.Manager
+	// BlockChain API
+	SetHead(number uint64)
+	HeaderByNumber(blockNr rpc.BlockNumber) *types.Header
+	BlockByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Block, error)
+	StateAndHeaderByNumber(blockNr rpc.BlockNumber) (State, *types.Header, error)
+	GetBlock(ctx context.Context, blockHash common.Hash) (*types.Block, error)
+	GetReceipts(ctx context.Context, blockHash common.Hash) (types.Receipts, error)
+	GetTd(blockHash common.Hash) *big.Int
+	GetVMEnv(ctx context.Context, msg core.Message, state State, header *types.Header) (vm.Environment, func() error, error)
+	// TxPool API
+	SendTx(ctx context.Context, signedTx *types.Transaction) error
+	RemoveTx(txHash common.Hash)
+	GetPoolTransactions() types.Transactions
+	GetPoolTransaction(txHash common.Hash) *types.Transaction
+	GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error)
+	Stats() (pending int, queued int)
+	TxPoolContent() (map[common.Address]map[uint64][]*types.Transaction, map[common.Address]map[uint64][]*types.Transaction)
+}
+
+type State interface {
+	GetBalance(ctx context.Context, addr common.Address) (*big.Int, error)
+	GetCode(ctx context.Context, addr common.Address) ([]byte, error)
+	GetState(ctx context.Context, a common.Address, b common.Hash) (common.Hash, error)
+	GetNonce(ctx context.Context, addr common.Address) (uint64, error)
+}
+
+func GetAPIs(apiBackend Backend, solcPath *string, solc **compiler.Solidity) []rpc.API {
+	return []rpc.API{
+		{
+			Namespace: "eth",
+			Version:   "1.0",
+			Service:   NewPublicEthereumAPI(apiBackend, solcPath, solc),
+			Public:    true,
+		}, {
+			Namespace: "eth",
+			Version:   "1.0",
+			Service:   NewPublicBlockChainAPI(apiBackend),
+			Public:    true,
+		}, {
+			Namespace: "eth",
+			Version:   "1.0",
+			Service:   NewPublicTransactionPoolAPI(apiBackend),
+			Public:    true,
+		}, {
+			Namespace: "txpool",
+			Version:   "1.0",
+			Service:   NewPublicTxPoolAPI(apiBackend),
+			Public:    true,
+		}, {
+			Namespace: "admin",
+			Version:   "1.0",
+			Service:   NewPrivateAdminAPI(apiBackend, solcPath, solc),
+		}, {
+			Namespace: "debug",
+			Version:   "1.0",
+			Service:   NewPublicDebugAPI(apiBackend),
+			Public:    true,
+		}, {
+			Namespace: "debug",
+			Version:   "1.0",
+			Service:   NewPrivateDebugAPI(apiBackend),
+		}, {
+			Namespace: "eth",
+			Version:   "1.0",
+			Service:   NewPublicAccountAPI(apiBackend.AccountManager()),
+			Public:    true,
+		}, {
+			Namespace: "personal",
+			Version:   "1.0",
+			Service:   NewPrivateAccountAPI(apiBackend),
+			Public:    false,
+		},
+	}
+}