Merge branch 'develop' of github.com:ethereum/go-ethereum into develop

Conflicts:
	rpc/jeth.go

22 files changed, 372 insertions, 103 deletions

diff --git a/cmd/geth/admin.go b/cmd/geth/admin.go
index 49e2dc6f8..2b9956638 100644
--- a/cmd/geth/admin.go
+++ b/cmd/geth/admin.go
@@ -70,6 +70,7 @@ func (js *jsre) adminBindings() {
 	miner.Set("stop", js.stopMining)
 	miner.Set("hashrate", js.hashrate)
 	miner.Set("setExtra", js.setExtra)
+	miner.Set("setGasPrice", js.setGasPrice)
 
 	admin.Set("debug", struct{}{})
 	t, _ = admin.Get("debug")
@@ -236,6 +237,17 @@ func (js *jsre) setExtra(call otto.FunctionCall) otto.Value {
 	return otto.UndefinedValue()
 }
 
+func (js *jsre) setGasPrice(call otto.FunctionCall) otto.Value {
+	gasPrice, err := call.Argument(0).ToString()
+	if err != nil {
+		fmt.Println(err)
+		return otto.UndefinedValue()
+	}
+
+	js.ethereum.Miner().SetGasPrice(common.String2Big(gasPrice))
+	return otto.UndefinedValue()
+}
+
 func (js *jsre) hashrate(otto.FunctionCall) otto.Value {
 	return js.re.ToVal(js.ethereum.Miner().HashRate())
 }
diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index fd6925e6d..fd7aae4c2 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -51,7 +51,7 @@ import _ "net/http/pprof"
 
 const (
 	ClientIdentifier = "Geth"
-	Version          = "0.9.17"
+	Version          = "0.9.19"
 )
 
 var (
@@ -244,6 +244,7 @@ JavaScript API. See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Conso
 		utils.MaxPeersFlag,
 		utils.MaxPendingPeersFlag,
 		utils.EtherbaseFlag,
+		utils.GasPriceFlag,
 		utils.MinerThreadsFlag,
 		utils.MiningEnabledFlag,
 		utils.NATFlag,
@@ -258,7 +259,7 @@ JavaScript API. See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Conso
 		utils.ProtocolVersionFlag,
 		utils.NetworkIdFlag,
 		utils.RPCCORSDomainFlag,
-		utils.LogLevelFlag,
+		utils.VerbosityFlag,
 		utils.BacktraceAtFlag,
 		utils.LogToStdErrFlag,
 		utils.LogVModuleFlag,
diff --git a/cmd/mist/main.go b/cmd/mist/main.go
index 9d92cc175..4b55b3026 100644
--- a/cmd/mist/main.go
+++ b/cmd/mist/main.go
@@ -37,7 +37,7 @@ import (
 
 const (
 	ClientIdentifier = "Mist"
-	Version          = "0.9.0"
+	Version          = "0.9.19"
 )
 
 var (
@@ -73,7 +73,7 @@ func init() {
 		utils.DataDirFlag,
 		utils.ListenPortFlag,
 		utils.LogFileFlag,
-		utils.LogLevelFlag,
+		utils.VerbosityFlag,
 		utils.MaxPeersFlag,
 		utils.MaxPendingPeersFlag,
 		utils.MinerThreadsFlag,
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index b18d9851f..dd3b6c8a2 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -4,6 +4,7 @@ import (
 	"crypto/ecdsa"
 	"fmt"
 	"log"
+	"math/big"
 	"net/http"
 	"os"
 	"path"
@@ -116,6 +117,11 @@ var (
 		Usage: "Public address for block mining rewards. By default the address of your primary account is used",
 		Value: "primary",
 	}
+	GasPriceFlag = cli.StringFlag{
+		Name:  "gasprice",
+		Usage: "Sets the minimal gasprice when mining transactions",
+		Value: new(big.Int).Mul(big.NewInt(10), common.Szabo).String(),
+	}
 
 	UnlockedAccountFlag = cli.StringFlag{
 		Name:  "unlock",
@@ -133,8 +139,8 @@ var (
 		Name:  "logfile",
 		Usage: "Send log output to a file",
 	}
-	LogLevelFlag = cli.IntFlag{
-		Name:  "loglevel",
+	VerbosityFlag = cli.IntFlag{
+		Name:  "verbosity",
 		Usage: "Logging verbosity: 0-6 (0=silent, 1=error, 2=warn, 3=info, 4=core, 5=debug, 6=debug detail)",
 		Value: int(logger.InfoLevel),
 	}
@@ -270,7 +276,7 @@ func GetNodeKey(ctx *cli.Context) (key *ecdsa.PrivateKey) {
 
 func MakeEthConfig(clientID, version string, ctx *cli.Context) *eth.Config {
 	// Set verbosity on glog
-	glog.SetV(ctx.GlobalInt(LogLevelFlag.Name))
+	glog.SetV(ctx.GlobalInt(VerbosityFlag.Name))
 	// Set the log type
 	//glog.SetToStderr(ctx.GlobalBool(LogToStdErrFlag.Name))
 	glog.SetToStderr(true)
@@ -290,7 +296,7 @@ func MakeEthConfig(clientID, version string, ctx *cli.Context) *eth.Config {
 		SkipBcVersionCheck: false,
 		NetworkId:          ctx.GlobalInt(NetworkIdFlag.Name),
 		LogFile:            ctx.GlobalString(LogFileFlag.Name),
-		LogLevel:           ctx.GlobalInt(LogLevelFlag.Name),
+		Verbosity:          ctx.GlobalInt(VerbosityFlag.Name),
 		LogJSON:            ctx.GlobalString(LogJSONFlag.Name),
 		Etherbase:          ctx.GlobalString(EtherbaseFlag.Name),
 		MinerThreads:       ctx.GlobalInt(MinerThreadsFlag.Name),
@@ -305,6 +311,7 @@ func MakeEthConfig(clientID, version string, ctx *cli.Context) *eth.Config {
 		Shh:                ctx.GlobalBool(WhisperEnabledFlag.Name),
 		Dial:               true,
 		BootNodes:          ctx.GlobalString(BootnodesFlag.Name),
+		GasPrice:           common.String2Big(ctx.GlobalString(GasPriceFlag.Name)),
 	}
 
 }
diff --git a/common/size.go b/common/size.go
index 0d9dbf558..4ea7f7b11 100644
--- a/common/size.go
+++ b/common/size.go
@@ -44,12 +44,6 @@ func CurrencyToString(num *big.Int) string {
 	)
 
 	switch {
-	case num.Cmp(Douglas) >= 0:
-		fin = new(big.Int).Div(num, Douglas)
-		denom = "Douglas"
-	case num.Cmp(Einstein) >= 0:
-		fin = new(big.Int).Div(num, Einstein)
-		denom = "Einstein"
 	case num.Cmp(Ether) >= 0:
 		fin = new(big.Int).Div(num, Ether)
 		denom = "Ether"
diff --git a/common/size_test.go b/common/size_test.go
index 1cbeff0a8..cfe7efe31 100644
--- a/common/size_test.go
+++ b/common/size_test.go
@@ -25,8 +25,6 @@ func (s *SizeSuite) TestStorageSizeString(c *checker.C) {
 }
 
 func (s *CommonSuite) TestCommon(c *checker.C) {
-	douglas := CurrencyToString(BigPow(10, 43))
-	einstein := CurrencyToString(BigPow(10, 22))
 	ether := CurrencyToString(BigPow(10, 19))
 	finney := CurrencyToString(BigPow(10, 16))
 	szabo := CurrencyToString(BigPow(10, 13))
@@ -35,8 +33,6 @@ func (s *CommonSuite) TestCommon(c *checker.C) {
 	ada := CurrencyToString(BigPow(10, 4))
 	wei := CurrencyToString(big.NewInt(10))
 
-	c.Assert(douglas, checker.Equals, "10 Douglas")
-	c.Assert(einstein, checker.Equals, "10 Einstein")
 	c.Assert(ether, checker.Equals, "10 Ether")
 	c.Assert(finney, checker.Equals, "10 Finney")
 	c.Assert(szabo, checker.Equals, "10 Szabo")
@@ -45,13 +41,3 @@ func (s *CommonSuite) TestCommon(c *checker.C) {
 	c.Assert(ada, checker.Equals, "10 Ada")
 	c.Assert(wei, checker.Equals, "10 Wei")
 }
-
-func (s *CommonSuite) TestLarge(c *checker.C) {
-	douglaslarge := CurrencyToString(BigPow(100000000, 43))
-	adalarge := CurrencyToString(BigPow(100000000, 4))
-	weilarge := CurrencyToString(big.NewInt(100000000))
-
-	c.Assert(douglaslarge, checker.Equals, "10000E298 Douglas")
-	c.Assert(adalarge, checker.Equals, "10000E7 Einstein")
-	c.Assert(weilarge, checker.Equals, "100 Babbage")
-}
diff --git a/core/events.go b/core/events.go
index 3da668af5..1ea35c2f4 100644
--- a/core/events.go
+++ b/core/events.go
@@ -1,8 +1,10 @@
 package core
 
 import (
-	"github.com/ethereum/go-ethereum/core/types"
+	"math/big"
+
 	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/types"
 )
 
 // TxPreEvent is posted when a transaction enters the transaction pool.
@@ -44,6 +46,8 @@ type ChainUncleEvent struct {
 
 type ChainHeadEvent struct{ Block *types.Block }
 
+type GasPriceChanged struct{ Price *big.Int }
+
 // Mining operation events
 type StartMining struct{}
 type TopMining struct{}
diff --git a/core/manager.go b/core/manager.go
index 9b5407a9e..433ada7ee 100644
--- a/core/manager.go
+++ b/core/manager.go
@@ -1,12 +1,14 @@
 package core
 
 import (
+	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/p2p"
 )
 
 type Backend interface {
+	AccountManager() *accounts.Manager
 	BlockProcessor() *BlockProcessor
 	ChainManager() *ChainManager
 	TxPool() *TxPool
diff --git a/core/transaction_pool.go b/core/transaction_pool.go
index 6898a4bda..e68f7406a 100644
--- a/core/transaction_pool.go
+++ b/core/transaction_pool.go
@@ -21,7 +21,7 @@ var (
 	ErrInvalidSender      = errors.New("Invalid sender")
 	ErrNonce              = errors.New("Nonce too low")
 	ErrBalance            = errors.New("Insufficient balance")
-	ErrNonExistentAccount = errors.New("Account does not exist")
+	ErrNonExistentAccount = errors.New("Account does not exist or account balance too low")
 	ErrInsufficientFunds  = errors.New("Insufficient funds for gas * price + value")
 	ErrIntrinsicGas       = errors.New("Intrinsic gas too low")
 	ErrGasLimit           = errors.New("Exceeds block gas limit")
diff --git a/eth/backend.go b/eth/backend.go
index 0f23cde2f..cdbe35b26 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"math/big"
 	"os"
 	"path"
 	"path/filepath"
@@ -53,12 +54,12 @@ type Config struct {
 	BlockChainVersion  int
 	SkipBcVersionCheck bool // e.g. blockchain export
 
-	DataDir  string
-	LogFile  string
-	LogLevel int
-	LogJSON  string
-	VmDebug  bool
-	NatSpec  bool
+	DataDir   string
+	LogFile   string
+	Verbosity int
+	LogJSON   string
+	VmDebug   bool
+	NatSpec   bool
 
 	MaxPeers        int
 	MaxPendingPeers int
@@ -76,6 +77,7 @@ type Config struct {
 	Dial bool
 
 	Etherbase      string
+	GasPrice       *big.Int
 	MinerThreads   int
 	AccountManager *accounts.Manager
 
@@ -200,7 +202,7 @@ type Ethereum struct {
 
 func New(config *Config) (*Ethereum, error) {
 	// Bootstrap database
-	logger.New(config.DataDir, config.LogFile, config.LogLevel)
+	logger.New(config.DataDir, config.LogFile, config.Verbosity)
 	if len(config.LogJSON) > 0 {
 		logger.NewJSONsystem(config.DataDir, config.LogJSON)
 	}
@@ -266,6 +268,8 @@ func New(config *Config) (*Ethereum, error) {
 	eth.blockProcessor = core.NewBlockProcessor(stateDb, extraDb, eth.pow, eth.txPool, eth.chainManager, eth.EventMux())
 	eth.chainManager.SetProcessor(eth.blockProcessor)
 	eth.miner = miner.New(eth, eth.pow, config.MinerThreads)
+	eth.miner.SetGasPrice(config.GasPrice)
+
 	eth.protocolManager = NewProtocolManager(config.ProtocolVersion, config.NetworkId, eth.eventMux, eth.txPool, eth.chainManager, eth.downloader)
 	if config.Shh {
 		eth.whisper = whisper.New()
@@ -447,6 +451,8 @@ func (s *Ethereum) Start() error {
 	return nil
 }
 
+// sync databases every minute. If flushing fails we exit immediatly. The system
+// may not continue under any circumstances.
 func (s *Ethereum) syncDatabases() {
 	ticker := time.NewTicker(1 * time.Minute)
 done:
@@ -455,13 +461,13 @@ done:
 		case <-ticker.C:
 			// don't change the order of database flushes
 			if err := s.extraDb.Flush(); err != nil {
-				glog.V(logger.Error).Infof("error: flush extraDb: %v\n", err)
+				glog.Fatalf("fatal error: flush extraDb: %v\n", err)
 			}
 			if err := s.stateDb.Flush(); err != nil {
-				glog.V(logger.Error).Infof("error: flush stateDb: %v\n", err)
+				glog.Fatalf("fatal error: flush stateDb: %v\n", err)
 			}
 			if err := s.blockDb.Flush(); err != nil {
-				glog.V(logger.Error).Infof("error: flush blockDb: %v\n", err)
+				glog.Fatalf("fatal error: flush blockDb: %v\n", err)
 			}
 		case <-s.shutdownChan:
 			break done
diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go
index 18f8d2ba8..14ca2cd3d 100644
--- a/eth/downloader/downloader.go
+++ b/eth/downloader/downloader.go
@@ -34,6 +34,9 @@ var (
 	errPeersUnavailable    = errors.New("no peers available or all peers tried for block download process")
 	errAlreadyInPool       = errors.New("hash already in pool")
 	errBlockNumberOverflow = errors.New("received block which overflows")
+	errCancelHashFetch     = errors.New("hash fetching cancelled (requested)")
+	errCancelBlockFetch    = errors.New("block downloading cancelled (requested)")
+	errNoSyncActive        = errors.New("no sync active")
 )
 
 type hashCheckFn func(common.Hash) bool
@@ -74,6 +77,7 @@ type Downloader struct {
 	newPeerCh chan *peer
 	hashCh    chan hashPack
 	blockCh   chan blockPack
+	cancelCh  chan struct{}
 }
 
 func New(hasBlock hashCheckFn, getBlock getBlockFn) *Downloader {
@@ -129,6 +133,9 @@ func (d *Downloader) Synchronise(id string, hash common.Hash) error {
 	}
 	defer atomic.StoreInt32(&d.synchronising, 0)
 
+	// Create cancel channel for aborting midflight
+	d.cancelCh = make(chan struct{})
+
 	// Abort if the queue still contains some leftover data
 	if _, cached := d.queue.Size(); cached > 0 && d.queue.GetHeadBlock() != nil {
 		return errPendingQueue
@@ -161,7 +168,6 @@ func (d *Downloader) Has(hash common.Hash) bool {
 }
 
 func (d *Downloader) getFromPeer(p *peer, hash common.Hash, ignoreInitial bool) (err error) {
-
 	d.activePeer = p.id
 	defer func() {
 		// reset on error
@@ -191,6 +197,42 @@ func (d *Downloader) getFromPeer(p *peer, hash common.Hash, ignoreInitial bool)
 	return nil
 }
 
+// Cancel cancels all of the operations and resets the queue. It returns true
+// if the cancel operation was completed.
+func (d *Downloader) Cancel() bool {
+	hs, bs := d.queue.Size()
+	// If we're not syncing just return.
+	if atomic.LoadInt32(&d.synchronising) == 0 && hs == 0 && bs == 0 {
+		return false
+	}
+
+	close(d.cancelCh)
+
+	// clean up
+hashDone:
+	for {
+		select {
+		case <-d.hashCh:
+		default:
+			break hashDone
+		}
+	}
+
+blockDone:
+	for {
+		select {
+		case <-d.blockCh:
+		default:
+			break blockDone
+		}
+	}
+
+	// reset the queue
+	d.queue.Reset()
+
+	return true
+}
+
 // XXX Make synchronous
 func (d *Downloader) startFetchingHashes(p *peer, h common.Hash, ignoreInitial bool) error {
 	glog.V(logger.Debug).Infof("Downloading hashes (%x) from %s", h[:4], p.id)
@@ -217,6 +259,8 @@ func (d *Downloader) startFetchingHashes(p *peer, h common.Hash, ignoreInitial b
 out:
 	for {
 		select {
+		case <-d.cancelCh:
+			return errCancelHashFetch
 		case hashPack := <-d.hashCh:
 			// Make sure the active peer is giving us the hashes
 			if hashPack.peerId != activePeer.id {
@@ -305,6 +349,8 @@ func (d *Downloader) startFetchingBlocks(p *peer) error {
 out:
 	for {
 		select {
+		case <-d.cancelCh:
+			return errCancelBlockFetch
 		case blockPack := <-d.blockCh:
 			// If the peer was previously banned and failed to deliver it's pack
 			// in a reasonable time frame, ignore it's message.
@@ -394,11 +440,23 @@ out:
 
 // Deliver a chunk to the downloader. This is usually done through the BlocksMsg by
 // the protocol handler.
-func (d *Downloader) DeliverChunk(id string, blocks []*types.Block) {
+func (d *Downloader) DeliverChunk(id string, blocks []*types.Block) error {
+	// Make sure the downloader is active
+	if atomic.LoadInt32(&d.synchronising) == 0 {
+		return errNoSyncActive
+	}
+
 	d.blockCh <- blockPack{id, blocks}
+
+	return nil
 }
 
 func (d *Downloader) AddHashes(id string, hashes []common.Hash) error {
+	// Make sure the downloader is active
+	if atomic.LoadInt32(&d.synchronising) == 0 {
+		return errNoSyncActive
+	}
+
 	// make sure that the hashes that are being added are actually from the peer
 	// that's the current active peer. hashes that have been received from other
 	// peers are dropped and ignored.
diff --git a/eth/downloader/downloader_test.go b/eth/downloader/downloader_test.go
index 8ccc4d1a5..d0f8d4c8f 100644
--- a/eth/downloader/downloader_test.go
+++ b/eth/downloader/downloader_test.go
@@ -182,6 +182,49 @@ func TestTaking(t *testing.T) {
 	}
 }
 
+func TestInactiveDownloader(t *testing.T) {
+	targetBlocks := 1000
+	hashes := createHashes(0, targetBlocks)
+	blocks := createBlocksFromHashSet(createHashSet(hashes))
+	tester := newTester(t, hashes, nil)
+
+	err := tester.downloader.AddHashes("bad peer 001", hashes)
+	if err != errNoSyncActive {
+		t.Error("expected no sync error, got", err)
+	}
+
+	err = tester.downloader.DeliverChunk("bad peer 001", blocks)
+	if err != errNoSyncActive {
+		t.Error("expected no sync error, got", err)
+	}
+}
+
+func TestCancel(t *testing.T) {
+	minDesiredPeerCount = 4
+	blockTtl = 1 * time.Second
+
+	targetBlocks := 1000
+	hashes := createHashes(0, targetBlocks)
+	blocks := createBlocksFromHashes(hashes)
+	tester := newTester(t, hashes, blocks)
+
+	tester.newPeer("peer1", big.NewInt(10000), hashes[0])
+
+	err := tester.sync("peer1", hashes[0])
+	if err != nil {
+		t.Error("download error", err)
+	}
+
+	if !tester.downloader.Cancel() {
+		t.Error("cancel operation unsuccessfull")
+	}
+
+	hashSize, blockSize := tester.downloader.queue.Size()
+	if hashSize > 0 || blockSize > 0 {
+		t.Error("block (", blockSize, ") or hash (", hashSize, ") not 0")
+	}
+}
+
 func TestThrottling(t *testing.T) {
 	minDesiredPeerCount = 4
 	blockTtl = 1 * time.Second
diff --git a/eth/sync.go b/eth/sync.go
index c49f5209d..d955eaa50 100644
--- a/eth/sync.go
+++ b/eth/sync.go
@@ -63,6 +63,9 @@ func (pm *ProtocolManager) processBlocks() error {
 		max := int(math.Min(float64(len(blocks)), float64(blockProcAmount)))
 		_, err := pm.chainman.InsertChain(blocks[:max])
 		if err != nil {
+			// cancel download process
+			pm.downloader.Cancel()
+
 			return err
 		}
 		blocks = blocks[max:]
diff --git a/ethdb/database.go b/ethdb/database.go
index 57a3f9ee6..15af02fdf 100644
--- a/ethdb/database.go
+++ b/ethdb/database.go
@@ -8,8 +8,11 @@ import (
 	"github.com/ethereum/go-ethereum/logger/glog"
 	"github.com/syndtr/goleveldb/leveldb"
 	"github.com/syndtr/goleveldb/leveldb/iterator"
+	"github.com/syndtr/goleveldb/leveldb/opt"
 )
 
+const openFileLimit = 128
+
 type LDBDatabase struct {
 	fn string
 
@@ -23,7 +26,7 @@ type LDBDatabase struct {
 
 func NewLDBDatabase(file string) (*LDBDatabase, error) {
 	// Open the db
-	db, err := leveldb.OpenFile(file, nil)
+	db, err := leveldb.OpenFile(file, &opt.Options{OpenFilesCacheCapacity: openFileLimit})
 	if err != nil {
 		return nil, err
 	}
diff --git a/miner/miner.go b/miner/miner.go
index bff0026dc..efe6d3051 100644
--- a/miner/miner.go
+++ b/miner/miner.go
@@ -7,6 +7,8 @@ import (
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
 	"github.com/ethereum/go-ethereum/pow"
 )
 
@@ -37,7 +39,18 @@ func (self *Miner) Mining() bool {
 	return self.mining
 }
 
+func (m *Miner) SetGasPrice(price *big.Int) {
+	// FIXME block tests set a nil gas price. Quick dirty fix
+	if price == nil {
+		return
+	}
+
+	m.worker.gasPrice = price
+}
+
 func (self *Miner) Start(coinbase common.Address) {
+	glog.V(logger.Info).Infoln("Starting mining operation")
+
 	self.mining = true
 	self.worker.coinbase = coinbase
 	self.worker.start()
diff --git a/miner/worker.go b/miner/worker.go
index 87d17dfd6..e3dbae717 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -7,6 +7,7 @@ import (
 	"sync"
 	"sync/atomic"
 
+	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
@@ -21,12 +22,18 @@ import (
 var jsonlogger = logger.NewJsonLogger()
 
 type environment struct {
-	totalUsedGas *big.Int
-	state        *state.StateDB
-	coinbase     *state.StateObject
-	block        *types.Block
-	family       *set.Set
-	uncles       *set.Set
+	totalUsedGas       *big.Int
+	state              *state.StateDB
+	coinbase           *state.StateObject
+	block              *types.Block
+	family             *set.Set
+	uncles             *set.Set
+	remove             *set.Set
+	tcount             int
+	ignoredTransactors *set.Set
+	lowGasTransactors  *set.Set
+	ownedAccounts      *set.Set
+	lowGasTxs          types.Transactions
 }
 
 func env(block *types.Block, eth core.Backend) *environment {
@@ -72,6 +79,7 @@ type worker struct {
 	proc  *core.BlockProcessor
 
 	coinbase common.Address
+	gasPrice *big.Int
 	extra    []byte
 
 	currentMu sync.Mutex
@@ -93,6 +101,7 @@ func newWorker(coinbase common.Address, eth core.Backend) *worker {
 		eth:            eth,
 		mux:            eth.EventMux(),
 		recv:           make(chan *types.Block),
+		gasPrice:       new(big.Int),
 		chain:          eth.ChainManager(),
 		proc:           eth.BlockProcessor(),
 		possibleUncles: make(map[common.Hash]*types.Block),
@@ -123,15 +132,22 @@ func (self *worker) pendingBlock() *types.Block {
 }
 
 func (self *worker) start() {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
+	atomic.StoreInt32(&self.mining, 1)
+
 	// spin up agents
 	for _, agent := range self.agents {
 		agent.Start()
 	}
 
-	atomic.StoreInt32(&self.mining, 1)
 }
 
 func (self *worker) stop() {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
 	if atomic.LoadInt32(&self.mining) == 1 {
 		// stop all agents
 		for _, agent := range self.agents {
@@ -144,6 +160,9 @@ func (self *worker) stop() {
 }
 
 func (self *worker) register(agent Agent) {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
 	self.agents = append(self.agents, agent)
 	agent.SetReturnCh(self.recv)
 }
@@ -163,8 +182,11 @@ out:
 				self.possibleUncles[ev.Block.Hash()] = ev.Block
 				self.uncleMu.Unlock()
 			case core.TxPreEvent:
+				// Apply transaction to the pending state if we're not mining
 				if atomic.LoadInt32(&self.mining) == 0 {
-					self.commitNewWork()
+					self.mu.Lock()
+					self.commitTransactions(types.Transactions{ev.Tx})
+					self.mu.Unlock()
 				}
 			}
 		case <-self.quit:
@@ -230,13 +252,33 @@ func (self *worker) makeCurrent() {
 	}
 	block.Header().Extra = self.extra
 
-	self.current = env(block, self.eth)
+	current := env(block, self.eth)
 	for _, ancestor := range self.chain.GetAncestors(block, 7) {
-		self.current.family.Add(ancestor.Hash())
+		current.family.Add(ancestor.Hash())
 	}
+	accounts, _ := self.eth.AccountManager().Accounts()
+	// Keep track of transactions which return errors so they can be removed
+	current.remove = set.New()
+	current.tcount = 0
+	current.ignoredTransactors = set.New()
+	current.lowGasTransactors = set.New()
+	current.ownedAccounts = accountAddressesSet(accounts)
 
-	parent := self.chain.GetBlock(self.current.block.ParentHash())
-	self.current.coinbase.SetGasPool(core.CalcGasLimit(parent))
+	parent := self.chain.GetBlock(current.block.ParentHash())
+	current.coinbase.SetGasPool(core.CalcGasLimit(parent))
+
+	self.current = current
+}
+
+func (w *worker) setGasPrice(p *big.Int) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	// calculate the minimal gas price the miner accepts when sorting out transactions.
+	const pct = int64(90)
+	w.gasPrice = gasprice(p, pct)
+
+	w.mux.Post(core.GasPriceChanged{w.gasPrice})
 }
 
 func (self *worker) commitNewWork() {
@@ -248,54 +290,14 @@ func (self *worker) commitNewWork() {
 	defer self.currentMu.Unlock()
 
 	self.makeCurrent()
+	current := self.current
 
 	transactions := self.eth.TxPool().GetTransactions()
 	sort.Sort(types.TxByNonce{transactions})
 
-	// Keep track of transactions which return errors so they can be removed
-	var (
-		remove             = set.New()
-		tcount             = 0
-		ignoredTransactors = set.New()
-	)
-
-	for _, tx := range transactions {
-		// We can skip err. It has already been validated in the tx pool
-		from, _ := tx.From()
-		// Move on to the next transaction when the transactor is in ignored transactions set
-		// This may occur when a transaction hits the gas limit. When a gas limit is hit and
-		// the transaction is processed (that could potentially be included in the block) it
-		// will throw a nonce error because the previous transaction hasn't been processed.
-		// Therefor we need to ignore any transaction after the ignored one.
-		if ignoredTransactors.Has(from) {
-			continue
-		}
-
-		self.current.state.StartRecord(tx.Hash(), common.Hash{}, 0)
-
-		err := self.commitTransaction(tx)
-		switch {
-		case core.IsNonceErr(err) || core.IsInvalidTxErr(err):
-			// Remove invalid transactions
-			from, _ := tx.From()
-
-			self.chain.TxState().RemoveNonce(from, tx.Nonce())
-			remove.Add(tx.Hash())
-
-			if glog.V(logger.Detail) {
-				glog.Infof("TX (%x) failed, will be removed: %v\n", tx.Hash().Bytes()[:4], err)
-			}
-		case state.IsGasLimitErr(err):
-			from, _ := tx.From()
-			// ignore the transactor so no nonce errors will be thrown for this account
-			// next time the worker is run, they'll be picked up again.
-			ignoredTransactors.Add(from)
-
-			glog.V(logger.Detail).Infof("Gas limit reached for (%x) in this block. Continue to try smaller txs\n", from[:4])
-		default:
-			tcount++
-		}
-	}
+	// commit transactions for this run
+	self.commitTransactions(transactions)
+	self.eth.TxPool().RemoveTransactions(current.lowGasTxs)
 
 	var (
 		uncles    []*types.Header
@@ -321,7 +323,7 @@ func (self *worker) commitNewWork() {
 
 	// We only care about logging if we're actually mining
 	if atomic.LoadInt32(&self.mining) == 1 {
-		glog.V(logger.Info).Infof("commit new work on block %v with %d txs & %d uncles\n", self.current.block.Number(), tcount, len(uncles))
+		glog.V(logger.Info).Infof("commit new work on block %v with %d txs & %d uncles\n", current.block.Number(), current.tcount, len(uncles))
 	}
 
 	for _, hash := range badUncles {
@@ -361,6 +363,71 @@ func (self *worker) commitUncle(uncle *types.Header) error {
 	return nil
 }
 
+func (self *worker) commitTransactions(transactions types.Transactions) {
+	current := self.current
+
+	for _, tx := range transactions {
+		// We can skip err. It has already been validated in the tx pool
+		from, _ := tx.From()
+
+		// check if it falls within margin
+		if tx.GasPrice().Cmp(self.gasPrice) < 0 {
+			// ignore the transaction and transactor. We ignore the transactor
+			// because nonce will fail after ignoring this transaction so there's
+			// no point
+			current.lowGasTransactors.Add(from)
+
+			glog.V(logger.Info).Infof("transaction(%x) below gas price (tx=%v ask=%v). All sequential txs from this address(%x) will be ignored\n", tx.Hash().Bytes()[:4], common.CurrencyToString(tx.GasPrice()), common.CurrencyToString(self.gasPrice), from[:4])
+		}
+
+		// Continue with the next transaction if the transaction sender is included in
+		// the low gas tx set. This will also remove the tx and all sequential transaction
+		// from this transactor
+		if current.lowGasTransactors.Has(from) {
+			// add tx to the low gas set. This will be removed at the end of the run
+			// owned accounts are ignored
+			if !current.ownedAccounts.Has(from) {
+				current.lowGasTxs = append(current.lowGasTxs, tx)
+			}
+			continue
+		}
+
+		// Move on to the next transaction when the transactor is in ignored transactions set
+		// This may occur when a transaction hits the gas limit. When a gas limit is hit and
+		// the transaction is processed (that could potentially be included in the block) it
+		// will throw a nonce error because the previous transaction hasn't been processed.
+		// Therefor we need to ignore any transaction after the ignored one.
+		if current.ignoredTransactors.Has(from) {
+			continue
+		}
+
+		self.current.state.StartRecord(tx.Hash(), common.Hash{}, 0)
+
+		err := self.commitTransaction(tx)
+		switch {
+		case core.IsNonceErr(err) || core.IsInvalidTxErr(err):
+			// Remove invalid transactions
+			from, _ := tx.From()
+
+			self.chain.TxState().RemoveNonce(from, tx.Nonce())
+			current.remove.Add(tx.Hash())
+
+			if glog.V(logger.Detail) {
+				glog.Infof("TX (%x) failed, will be removed: %v\n", tx.Hash().Bytes()[:4], err)
+			}
+		case state.IsGasLimitErr(err):
+			from, _ := tx.From()
+			// ignore the transactor so no nonce errors will be thrown for this account
+			// next time the worker is run, they'll be picked up again.
+			current.ignoredTransactors.Add(from)
+
+			glog.V(logger.Detail).Infof("Gas limit reached for (%x) in this block. Continue to try smaller txs\n", from[:4])
+		default:
+			current.tcount++
+		}
+	}
+}
+
 func (self *worker) commitTransaction(tx *types.Transaction) error {
 	snap := self.current.state.Copy()
 	receipt, _, err := self.proc.ApplyTransaction(self.current.coinbase, self.current.state, self.current.block, tx, self.current.totalUsedGas, true)
@@ -383,3 +450,20 @@ func (self *worker) HashRate() int64 {
 
 	return tot
 }
+
+// gasprice calculates a reduced gas price based on the pct
+// XXX Use big.Rat?
+func gasprice(price *big.Int, pct int64) *big.Int {
+	p := new(big.Int).Set(price)
+	p.Div(p, big.NewInt(100))
+	p.Mul(p, big.NewInt(pct))
+	return p
+}
+
+func accountAddressesSet(accounts []accounts.Account) *set.Set {
+	accountSet := set.New()
+	for _, account := range accounts {
+		accountSet.Add(common.BytesToAddress(account.Address))
+	}
+	return accountSet
+}
diff --git a/rpc/api.go b/rpc/api.go
index 7fab589f2..309c161ad 100644
--- a/rpc/api.go
+++ b/rpc/api.go
@@ -450,10 +450,18 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		*reply = newHexData(res)
 
 	case "shh_version":
+		// Short circuit if whisper is not running
+		if api.xeth().Whisper() == nil {
+			return NewNotAvailableError(req.Method, "whisper offline")
+		}
 		// Retrieves the currently running whisper protocol version
 		*reply = api.xeth().WhisperVersion()
 
 	case "shh_post":
+		// Short circuit if whisper is not running
+		if api.xeth().Whisper() == nil {
+			return NewNotAvailableError(req.Method, "whisper offline")
+		}
 		// Injects a new message into the whisper network
 		args := new(WhisperMessageArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
@@ -466,10 +474,18 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		*reply = true
 
 	case "shh_newIdentity":
+		// Short circuit if whisper is not running
+		if api.xeth().Whisper() == nil {
+			return NewNotAvailableError(req.Method, "whisper offline")
+		}
 		// Creates a new whisper identity to use for sending/receiving messages
 		*reply = api.xeth().Whisper().NewIdentity()
 
 	case "shh_hasIdentity":
+		// Short circuit if whisper is not running
+		if api.xeth().Whisper() == nil {
+			return NewNotAvailableError(req.Method, "whisper offline")
+		}
 		// Checks if an identity if owned or not
 		args := new(WhisperIdentityArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
@@ -478,6 +494,10 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		*reply = api.xeth().Whisper().HasIdentity(args.Identity)
 
 	case "shh_newFilter":
+		// Short circuit if whisper is not running
+		if api.xeth().Whisper() == nil {
+			return NewNotAvailableError(req.Method, "whisper offline")
+		}
 		// Create a new filter to watch and match messages with
 		args := new(WhisperFilterArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
@@ -487,6 +507,10 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		*reply = newHexNum(big.NewInt(int64(id)).Bytes())
 
 	case "shh_uninstallFilter":
+		// Short circuit if whisper is not running
+		if api.xeth().Whisper() == nil {
+			return NewNotAvailableError(req.Method, "whisper offline")
+		}
 		// Remove an existing filter watching messages
 		args := new(FilterIdArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
@@ -495,6 +519,10 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		*reply = api.xeth().UninstallWhisperFilter(args.Id)
 
 	case "shh_getFilterChanges":
+		// Short circuit if whisper is not running
+		if api.xeth().Whisper() == nil {
+			return NewNotAvailableError(req.Method, "whisper offline")
+		}
 		// Retrieve all the new messages arrived since the last request
 		args := new(FilterIdArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
@@ -503,12 +531,17 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		*reply = api.xeth().WhisperMessagesChanged(args.Id)
 
 	case "shh_getMessages":
+		// Short circuit if whisper is not running
+		if api.xeth().Whisper() == nil {
+			return NewNotAvailableError(req.Method, "whisper offline")
+		}
 		// Retrieve all the cached messages matching a specific, existing filter
 		args := new(FilterIdArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
 			return err
 		}
 		*reply = api.xeth().WhisperMessages(args.Id)
+
 	case "eth_hashrate":
 		*reply = newHexNum(api.xeth().HashRate())
 
diff --git a/rpc/http.go b/rpc/http.go
index 4760601d8..c5bb10c80 100644
--- a/rpc/http.go
+++ b/rpc/http.go
@@ -116,7 +116,7 @@ func RpcResponse(api *EthereumApi, request *RpcRequest) *interface{} {
 	switch reserr.(type) {
 	case nil:
 		response = &RpcSuccessResponse{Jsonrpc: jsonrpcver, Id: request.Id, Result: reply}
-	case *NotImplementedError:
+	case *NotImplementedError, *NotAvailableError:
 		jsonerr := &RpcErrorObject{-32601, reserr.Error()}
 		response = &RpcErrorResponse{Jsonrpc: jsonrpcver, Id: request.Id, Error: jsonerr}
 	case *DecodeParamError, *InsufficientParamsError, *ValidationError, *InvalidTypeError:
diff --git a/rpc/jeth.go b/rpc/jeth.go
index ad52b72d7..2097ac30d 100644
--- a/rpc/jeth.go
+++ b/rpc/jeth.go
@@ -2,6 +2,7 @@ package rpc
 
 import (
 	"encoding/json"
+	"fmt"
 	"github.com/ethereum/go-ethereum/jsre"
 	"github.com/robertkrimen/otto"
 )
@@ -50,6 +51,7 @@ func (self *Jeth) Send(call otto.FunctionCall) (response otto.Value) {
 		var respif interface{}
 		err = self.ethApi.GetRequestReply(&req, &respif)
 		if err != nil {
+			fmt.Println("Error response:", err)
 			return self.err(call, -32603, err.Error(), req.Id)
 		}
 		call.Otto.Set("ret_jsonrpc", jsonrpcver)
diff --git a/rpc/types.go b/rpc/types.go
index 1784759a4..e6eb4f856 100644
--- a/rpc/types.go
+++ b/rpc/types.go
@@ -209,6 +209,22 @@ func NewNotImplementedError(method string) *NotImplementedError {
 	}
 }
 
+type NotAvailableError struct {
+	Method string
+	Reason string
+}
+
+func (e *NotAvailableError) Error() string {
+	return fmt.Sprintf("%s method not available: %s", e.Method, e.Reason)
+}
+
+func NewNotAvailableError(method string, reason string) *NotAvailableError {
+	return &NotAvailableError{
+		Method: method,
+		Reason: reason,
+	}
+}
+
 type DecodeParamError struct {
 	err string
 }
diff --git a/tests/block_test.go b/tests/block_test.go
index 79e3335b1..e72f2b548 100644
--- a/tests/block_test.go
+++ b/tests/block_test.go
@@ -103,7 +103,7 @@ func testEthConfig() *eth.Config {
 
 	return &eth.Config{
 		DataDir:        common.DefaultDataDir(),
-		LogLevel:       5,
+		Verbosity:      5,
 		Etherbase:      "primary",
 		AccountManager: accounts.NewManager(ks),
 		NewDB:          func(path string) (common.Database, error) { return ethdb.NewMemDatabase() },
diff --git a/xeth/xeth.go b/xeth/xeth.go
index dc2d4f06f..06cd9dc1b 100644
--- a/xeth/xeth.go
+++ b/xeth/xeth.go
@@ -79,7 +79,6 @@ func New(eth *eth.Ethereum, frontend Frontend) *XEth {
 	xeth := &XEth{
 		backend:          eth,
 		frontend:         frontend,
-		whisper:          NewWhisper(eth.Whisper()),
 		quit:             make(chan struct{}),
 		filterManager:    filter.NewFilterManager(eth.EventMux()),
 		logQueue:         make(map[int]*logQueue),
@@ -88,6 +87,9 @@ func New(eth *eth.Ethereum, frontend Frontend) *XEth {
 		messages:         make(map[int]*whisperFilter),
 		agent:            miner.NewRemoteAgent(),
 	}
+	if eth.Whisper() != nil {
+		xeth.whisper = NewWhisper(eth.Whisper())
+	}
 	eth.Miner().Register(xeth.agent)
 	if frontend == nil {
 		xeth.frontend = dummyFrontend{}