Merge branch 'release/0.3.0'

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2013 Geff Obscura
+Copyright (c) 2013 Jeffrey Wilcke
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -3,44 +3,18 @@ Ethereum
 
 [![Build Status](https://travis-ci.org/ethereum/go-ethereum.png?branch=master)](https://travis-ci.org/ethereum/go-ethereum)
 
-Ethereum Go developer client (c) Jeffrey Wilcke
+Ethereum Go Client (c) Jeffrey Wilcke
 
-Ethereum is currently in its testing phase. The current state is "Proof
-of Concept 2". For build instructions see the [Wiki](https://github.com/ethereum/go-ethereum/wiki/Building-Edge).
+The current state is "Proof of Concept 3". For build instructions see
+the [Wiki](https://github.com/ethereum/go-ethereum/wiki/Building-Edge).
 
-Ethereum Go is split up in several sub packages Please refer to each
-individual package for more information.
-  1. [eth](https://github.com/ethereum/eth-go)
-  2. [ethchain](https://github.com/ethereum/ethchain-go)
-  3. [ethwire](https://github.com/ethereum/ethwire-go)
-  4. [ethdb](https://github.com/ethereum/ethdb-go)
-  5. [ethutil](https://github.com/ethereum/ethutil-go)
-
-The [eth](https://github.com/ethereum/eth-go) is the top-level package
-of the Ethereum protocol. It functions as the Ethereum bootstrapping and
-peer communication layer. The [ethchain](https://github.com/ethereum/ethchain-go)
-contains the Ethereum blockchain, block manager, transaction and
-transaction handlers. The [ethwire](https://github.com/ethereum/ethwire-go) contains
-the Ethereum [wire protocol](http://wiki.ethereum.org/index.php/Wire_Protocol) which can be used
-to hook in to the Ethereum network. [ethutil](https://github.com/ethereum/ethutil-go) contains
-utility functions which are not Ethereum specific. The utility package
-contains the [patricia trie](http://wiki.ethereum.org/index.php/Patricia_Tree),
-[RLP Encoding](http://wiki.ethereum.org/index.php/RLP) and hex encoding
-helpers. The [ethdb](https://github.com/ethereum/ethdb-go) package
-contains the LevelDB interface and memory DB interface.
-
-This executable is the front-end (currently nothing but a dev console) for
-the Ethereum Go implementation.
-
-If you'd like to start developing your own tools please check out the
-[development](https://github.com/ethereum/eth-go) package.
+For the development Go Package please see [eth-go package](https://github.com/ethereum/eth-go).
 
 Build
 =======
 
 For build instruction please see the [Wiki](https://github.com/ethereum/go-ethereum/wiki/Building-Edge)
 
-
 Command line options
 ====================
 
@@ -52,6 +26,9 @@ Command line options
 -upnp    Enable UPnP (= false)
 -x       Desired amount of peers (= 5)
 -h       This help
+-gui     Launch with GUI (= true)
+-dir     Data directory used to store configs and databases (=".ethereum")
+-import  Import a private key (hex)
 ```
 
 Developer console commands

config.go

@@ -13,15 +13,23 @@ var AddPeer string
 var MaxPeer int
 var GenAddr bool
 var UseSeed bool
+var ImportKey string
+var ExportKey bool
+var UseGui bool
+var DataDir string
 
 func Init() {
 	flag.BoolVar(&StartConsole, "c", false, "debug and testing console")
 	flag.BoolVar(&StartMining, "m", false, "start dagger mining")
 	flag.BoolVar(&ShowGenesis, "g", false, "prints genesis header and exits")
+	flag.BoolVar(&UseGui, "gui", true, "use the gui")
 	flag.BoolVar(&UseUPnP, "upnp", false, "enable UPnP support")
 	flag.BoolVar(&UseSeed, "seed", true, "seed peers")
 	flag.BoolVar(&GenAddr, "genaddr", false, "create a new priv/pub key")
+	flag.BoolVar(&ExportKey, "export", false, "export private key")
 	flag.StringVar(&OutboundPort, "p", "30303", "listening port")
+	flag.StringVar(&DataDir, "dir", ".ethereum", "ethereum data directory")
+	flag.StringVar(&ImportKey, "import", "", "imports the given private key (hex)")
 	flag.IntVar(&MaxPeer, "x", 5, "maximum desired peers")
 
 	flag.Parse()

dev_console.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bufio"
+	"bytes"
 	"encoding/hex"
 	"errors"
 	"fmt"
@@ -78,6 +79,32 @@ func (i *Console) ValidateInput(action string, argumentLength int) error {
 	}
 }
 
+func (i *Console) Editor() []string {
+	var buff bytes.Buffer
+	for {
+		reader := bufio.NewReader(os.Stdin)
+		str, _, err := reader.ReadLine()
+		if len(str) > 0 {
+			buff.Write(str)
+			buff.WriteString("\n")
+		}
+
+		if err != nil && err.Error() == "EOF" {
+			break
+		}
+	}
+
+	scanner := bufio.NewScanner(strings.NewReader(buff.String()))
+	scanner.Split(bufio.ScanLines)
+
+	var lines []string
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+
+	return lines
+}
+
 func (i *Console) PrintRoot() {
 	root := ethutil.NewValue(i.trie.Root)
 	if len(root.Bytes()) != 0 {
@@ -136,7 +163,8 @@ func (i *Console) ParseInput(input string) bool {
 		case "block":
 			encoded, _ := hex.DecodeString(tokens[1])
 			block := i.ethereum.BlockManager.BlockChain().GetBlock(encoded)
-			fmt.Println(block)
+			info := block.BlockInfo()
+			fmt.Printf("++++++++++ #%d ++++++++++\n%v\n", info.Number, block)
 		case "say":
 			i.ethereum.Broadcast(ethwire.MsgTalkTy, []interface{}{tokens[1]})
 		case "addp":
@@ -151,13 +179,13 @@ func (i *Console) ParseInput(input string) bool {
 				fmt.Println("recipient err:", err)
 			} else {
 				tx := ethchain.NewTransaction(recipient, ethutil.Big(tokens[2]), []string{""})
-				data, _ := ethutil.Config.Db.Get([]byte("KeyRing"))
-				keyRing := ethutil.NewValueFromBytes(data)
-				tx.Sign(keyRing.Get(0).Bytes())
-				fmt.Printf("%x\n", tx.Hash())
-				i.ethereum.TxPool.QueueTransaction(tx)
-			}
 
+				key := ethutil.Config.Db.GetKeys()[0]
+				tx.Sign(key.PrivateKey)
+				i.ethereum.TxPool.QueueTransaction(tx)
+
+				fmt.Printf("%x\n", tx.Hash())
+			}
 		case "gettx":
 			addr, _ := hex.DecodeString(tokens[1])
 			data, _ := ethutil.Config.Db.Get(addr)
@@ -168,10 +196,17 @@ func (i *Console) ParseInput(input string) bool {
 				fmt.Println("gettx: tx not found")
 			}
 		case "contract":
-			contract := ethchain.NewTransaction([]byte{}, ethutil.Big(tokens[1]), []string{"PUSH", "1234"})
-			fmt.Printf("%x\n", contract.Hash())
+			fmt.Println("Contract editor (Ctrl-D = done)")
+			code := ethchain.Compile(i.Editor())
+
+			contract := ethchain.NewTransaction(ethchain.ContractAddr, ethutil.Big(tokens[1]), code)
+
+			key := ethutil.Config.Db.GetKeys()[0]
+			contract.Sign(key.PrivateKey)
 
 			i.ethereum.TxPool.QueueTransaction(contract)
+
+			fmt.Printf("%x\n", contract.Hash()[12:])
 		case "exit", "quit", "q":
 			return false
 		case "help":

ethereum.go

@@ -5,6 +5,9 @@ import (
 	"github.com/ethereum/eth-go"
 	"github.com/ethereum/eth-go/ethchain"
 	"github.com/ethereum/eth-go/ethutil"
+	"github.com/ethereum/eth-go/ethwire"
+	"github.com/ethereum/go-ethereum/ui"
+	"github.com/niemeyer/qml"
 	"github.com/obscuren/secp256k1-go"
 	"log"
 	"os"
@@ -33,13 +36,12 @@ func CreateKeyPair(force bool) {
 	data, _ := ethutil.Config.Db.Get([]byte("KeyRing"))
 	if len(data) == 0 || force {
 		pub, prv := secp256k1.GenerateKeyPair()
-		addr := ethutil.Sha3Bin(pub[1:])[12:]
+		pair := &ethutil.Key{PrivateKey: prv, PublicKey: pub}
+		ethutil.Config.Db.Put([]byte("KeyRing"), pair.RlpEncode())
 
 		fmt.Printf(`
 Generating new address and keypair.
 Please keep your keys somewhere save.
-Currently Ethereum(G) does not support
-exporting keys.
 
 ++++++++++++++++ KeyRing +++++++++++++++++++
 addr: %x
@@ -47,19 +49,45 @@ prvk: %x
 pubk: %x
 ++++++++++++++++++++++++++++++++++++++++++++
 
-`, addr, prv, pub)
+`, pair.Address(), prv, pub)
 
-		keyRing := ethutil.NewValue([]interface{}{prv, addr, pub[1:]})
-		ethutil.Config.Db.Put([]byte("KeyRing"), keyRing.Encode())
 	}
 }
 
+func ImportPrivateKey(prvKey string) {
+	key := ethutil.FromHex(prvKey)
+	msg := []byte("tmp")
+	// Couldn't think of a better way to get the pub key
+	sig, _ := secp256k1.Sign(msg, key)
+	pub, _ := secp256k1.RecoverPubkey(msg, sig)
+	pair := &ethutil.Key{PrivateKey: key, PublicKey: pub}
+	ethutil.Config.Db.Put([]byte("KeyRing"), pair.RlpEncode())
+
+	fmt.Printf(`
+Importing private key
+
+++++++++++++++++ KeyRing +++++++++++++++++++
+addr: %x
+prvk: %x
+pubk: %x
+++++++++++++++++++++++++++++++++++++++++++++
+
+`, pair.Address(), key, pub)
+}
+
 func main() {
-	runtime.GOMAXPROCS(runtime.NumCPU())
 	Init()
 
+	// Qt has to be initialized in the main thread or it will throw errors
+	// It has to be called BEFORE setting the maximum procs.
+	if UseGui {
+		qml.Init(nil)
+	}
+
+	runtime.GOMAXPROCS(runtime.NumCPU())
+
 	ethchain.InitFees()
-	ethutil.ReadConfig(".ethereum")
+	ethutil.ReadConfig(DataDir)
 	ethutil.Config.Seed = UseSeed
 
 	// Instantiated a eth stack
@@ -68,6 +96,7 @@ func main() {
 		log.Println("eth start err:", err)
 		return
 	}
+	ethereum.Port = OutboundPort
 
 	if GenAddr {
 		fmt.Println("This action overwrites your old private key. Are you sure? (y/n)")
@@ -87,7 +116,31 @@ func main() {
 		}
 		os.Exit(0)
 	} else {
-		CreateKeyPair(false)
+		if len(ImportKey) > 0 {
+			fmt.Println("This action overwrites your old private key. Are you sure? (y/n)")
+			var r string
+			fmt.Scanln(&r)
+			for ; ; fmt.Scanln(&r) {
+				if r == "n" || r == "y" {
+					break
+				} else {
+					fmt.Printf("Yes or no?", r)
+				}
+			}
+
+			if r == "y" {
+				ImportPrivateKey(ImportKey)
+				os.Exit(0)
+			}
+		} else {
+			CreateKeyPair(false)
+		}
+	}
+
+	if ExportKey {
+		key := ethutil.Config.Db.GetKeys()[0]
+		fmt.Printf("%x\n", key.PrivateKey)
+		os.Exit(0)
 	}
 
 	if ShowGenesis {
@@ -111,41 +164,47 @@ func main() {
 		go console.Start()
 	}
 
-	RegisterInterupts(ethereum)
+	if UseGui {
+		gui := ethui.New(ethereum)
+		gui.Start()
+		//ethereum.Stop()
+	} else {
+		RegisterInterupts(ethereum)
+		ethereum.Start()
 
-	ethereum.Start()
+		if StartMining {
+			log.Printf("Miner started\n")
 
-	if StartMining {
-		log.Printf("Miner started\n")
+			// Fake block mining. It broadcasts a new block every 5 seconds
+			go func() {
+				pow := &ethchain.EasyPow{}
+				data, _ := ethutil.Config.Db.Get([]byte("KeyRing"))
+				keyRing := ethutil.NewValueFromBytes(data)
+				addr := keyRing.Get(1).Bytes()
 
-		// Fake block mining. It broadcasts a new block every 5 seconds
-		go func() {
-			pow := &ethchain.EasyPow{}
-			data, _ := ethutil.Config.Db.Get([]byte("KeyRing"))
-			keyRing := ethutil.NewValueFromBytes(data)
-			addr := keyRing.Get(1).Bytes()
+				for {
+					txs := ethereum.TxPool.Flush()
+					// Create a new block which we're going to mine
+					block := ethereum.BlockManager.BlockChain().NewBlock(addr, txs)
+					// Apply all transactions to the block
+					ethereum.BlockManager.ApplyTransactions(block, block.Transactions())
 
-			for {
-				txs := ethereum.TxPool.Flush()
-				// Create a new block which we're going to mine
-				block := ethereum.BlockManager.BlockChain().NewBlock(addr, txs)
-				// Apply all transactions to the block
-				ethereum.BlockManager.ApplyTransactions(block, block.Transactions())
+					ethereum.BlockManager.AccumelateRewards(block, block)
 
-				ethereum.BlockManager.AccumelateRewards(block, block)
-
-				// Search the nonce
-				block.Nonce = pow.Search(block)
-				err := ethereum.BlockManager.ProcessBlock(block)
-				if err != nil {
-					log.Println(err)
-				} else {
-					log.Println("\n+++++++ MINED BLK +++++++\n", ethereum.BlockManager.BlockChain().CurrentBlock)
+					// Search the nonce
+					block.Nonce = pow.Search(block)
+					ethereum.Broadcast(ethwire.MsgBlockTy, []interface{}{block.Value().Val})
+					err := ethereum.BlockManager.ProcessBlock(block)
+					if err != nil {
+						log.Println(err)
+					} else {
+						log.Println("\n+++++++ MINED BLK +++++++\n", ethereum.BlockManager.BlockChain().CurrentBlock)
+					}
 				}
-			}
-		}()
-	}
+			}()
+		}
 
-	// Wait for shutdown
-	ethereum.WaitForShutdown()
+		// Wait for shutdown
+		ethereum.WaitForShutdown()
+	}
 }

test_app.qml

@@ -0,0 +1,35 @@
+import QtQuick 2.0
+import QtQuick.Controls 1.0;
+import QtQuick.Layouts 1.0;
+import Ethereum 1.0
+
+ApplicationWindow {
+	minimumWidth: 500
+	maximumWidth: 500
+	maximumHeight: 100
+	minimumHeight: 100
+
+	title: "Ethereum Dice"
+
+	TextField {
+		id: textField
+		anchors.verticalCenter: parent.verticalCenter
+		anchors.horizontalCenter: parent.horizontalCenter
+		placeholderText: "Amount"
+	}
+	Label {
+		id: txHash
+		anchors.bottom: textField.top
+		anchors.bottomMargin: 5
+		anchors.horizontalCenter: parent.horizontalCenter
+	}
+	Button {
+		anchors.top: textField.bottom
+		anchors.horizontalCenter: parent.horizontalCenter
+		anchors.topMargin: 5
+		text: "Place bet"
+		onClicked: {
+			txHash.text = eth.createTx("e6716f9544a56c530d868e4bfbacb172315bdead", textField.text)
+		}
+	}
+}

transactions.qml

@@ -0,0 +1,9 @@
+import QtQuick 2.0
+import QtQuick.Controls 1.0;
+import QtQuick.Layouts 1.0;
+
+Rectangle {
+	id: transactionView
+	visible: false
+	Text { text: "TX VIEW" }
+}

ui/gui.go

@@ -0,0 +1,217 @@
+package ethui
+
+import (
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"github.com/ethereum/eth-go"
+	"github.com/ethereum/eth-go/ethchain"
+	"github.com/ethereum/eth-go/ethdb"
+	"github.com/ethereum/eth-go/ethutil"
+	"github.com/niemeyer/qml"
+	"math/big"
+	"strings"
+)
+
+// Block interface exposed to QML
+type Block struct {
+	Number int
+	Hash   string
+}
+
+type Tx struct {
+	Value, Hash, Address string
+}
+
+func NewTxFromTransaction(tx *ethchain.Transaction) *Tx {
+	hash := hex.EncodeToString(tx.Hash())
+	sender := hex.EncodeToString(tx.Recipient)
+
+	return &Tx{Hash: hash, Value: ethutil.CurrencyToString(tx.Value), Address: sender}
+}
+
+// Creates a new QML Block from a chain block
+func NewBlockFromBlock(block *ethchain.Block) *Block {
+	info := block.BlockInfo()
+	hash := hex.EncodeToString(block.Hash())
+
+	return &Block{Number: int(info.Number), Hash: hash}
+}
+
+type Gui struct {
+	// The main application window
+	win *qml.Window
+	// QML Engine
+	engine    *qml.Engine
+	component *qml.Common
+	// The ethereum interface
+	eth *eth.Ethereum
+
+	// The public Ethereum library
+	lib *EthLib
+
+	txDb *ethdb.LDBDatabase
+
+	addr []byte
+}
+
+// Create GUI, but doesn't start it
+func New(ethereum *eth.Ethereum) *Gui {
+	lib := &EthLib{blockManager: ethereum.BlockManager, blockChain: ethereum.BlockManager.BlockChain(), txPool: ethereum.TxPool}
+	db, err := ethdb.NewLDBDatabase("tx_database")
+	if err != nil {
+		panic(err)
+	}
+
+	key := ethutil.Config.Db.GetKeys()[0]
+	addr := key.Address()
+
+	ethereum.BlockManager.WatchAddr(addr)
+
+	return &Gui{eth: ethereum, lib: lib, txDb: db, addr: addr}
+}
+
+func (ui *Gui) Start() {
+	defer ui.txDb.Close()
+
+	// Register ethereum functions
+	qml.RegisterTypes("Ethereum", 1, 0, []qml.TypeSpec{{
+		Init: func(p *Block, obj qml.Object) { p.Number = 0; p.Hash = "" },
+	}, {
+		Init: func(p *Tx, obj qml.Object) { p.Value = ""; p.Hash = ""; p.Address = "" },
+	}})
+
+	ethutil.Config.Log.Infoln("[GUI] Starting GUI")
+	// Create a new QML engine
+	ui.engine = qml.NewEngine()
+	// Load the main QML interface
+	component, err := ui.engine.LoadFile("wallet.qml")
+	if err != nil {
+		panic(err)
+	}
+	ui.engine.LoadFile("transactions.qml")
+
+	ui.win = component.CreateWindow(nil)
+
+	context := ui.engine.Context()
+
+	// Expose the eth library and the ui library to QML
+	context.SetVar("eth", ui.lib)
+	context.SetVar("ui", &UiLib{engine: ui.engine, eth: ui.eth})
+
+	// Register the ui as a block processor
+	ui.eth.BlockManager.SecondaryBlockProcessor = ui
+	//ui.eth.TxPool.SecondaryProcessor = ui
+
+	// Add the ui as a log system so we can log directly to the UGI
+	ethutil.Config.Log.AddLogSystem(ui)
+
+	// Loads previous blocks
+	go ui.setInitialBlockChain()
+	go ui.readPreviousTransactions()
+	go ui.update()
+
+	ui.win.Show()
+	ui.win.Wait()
+
+	ui.eth.Stop()
+}
+
+func (ui *Gui) setInitialBlockChain() {
+	// Load previous 10 blocks
+	chain := ui.eth.BlockManager.BlockChain().GetChain(ui.eth.BlockManager.BlockChain().CurrentBlock.Hash(), 10)
+	for _, block := range chain {
+		ui.ProcessBlock(block)
+	}
+
+}
+
+func (ui *Gui) readPreviousTransactions() {
+	it := ui.txDb.Db().NewIterator(nil, nil)
+	for it.Next() {
+		tx := ethchain.NewTransactionFromBytes(it.Value())
+
+		ui.win.Root().Call("addTx", NewTxFromTransaction(tx))
+	}
+	it.Release()
+}
+
+func (ui *Gui) ProcessBlock(block *ethchain.Block) {
+	ui.win.Root().Call("addBlock", NewBlockFromBlock(block))
+}
+
+// Simple go routine function that updates the list of peers in the GUI
+func (ui *Gui) update() {
+	txChan := make(chan ethchain.TxMsg, 1)
+	ui.eth.TxPool.Subscribe(txChan)
+
+	account := ui.eth.BlockManager.GetAddrState(ui.addr).Account
+	unconfirmedFunds := new(big.Int)
+	ui.win.Root().Call("setWalletValue", fmt.Sprintf("%v", ethutil.CurrencyToString(account.Amount)))
+	for {
+		select {
+		case txMsg := <-txChan:
+			tx := txMsg.Tx
+
+			if txMsg.Type == ethchain.TxPre {
+				if bytes.Compare(tx.Sender(), ui.addr) == 0 {
+					ui.win.Root().Call("addTx", NewTxFromTransaction(tx))
+					ui.txDb.Put(tx.Hash(), tx.RlpEncode())
+
+					ui.eth.BlockManager.GetAddrState(ui.addr).Nonce += 1
+					unconfirmedFunds.Sub(unconfirmedFunds, tx.Value)
+				} else if bytes.Compare(tx.Recipient, ui.addr) == 0 {
+					ui.win.Root().Call("addTx", NewTxFromTransaction(tx))
+					ui.txDb.Put(tx.Hash(), tx.RlpEncode())
+
+					unconfirmedFunds.Add(unconfirmedFunds, tx.Value)
+				}
+
+				pos := "+"
+				if unconfirmedFunds.Cmp(big.NewInt(0)) >= 0 {
+					pos = "-"
+				}
+				val := ethutil.CurrencyToString(new(big.Int).Abs(ethutil.BigCopy(unconfirmedFunds)))
+				str := fmt.Sprintf("%v (%s %v)", ethutil.CurrencyToString(account.Amount), pos, val)
+
+				ui.win.Root().Call("setWalletValue", str)
+			} else {
+				amount := account.Amount
+				if bytes.Compare(tx.Sender(), ui.addr) == 0 {
+					amount.Sub(account.Amount, tx.Value)
+				} else if bytes.Compare(tx.Recipient, ui.addr) == 0 {
+					amount.Add(account.Amount, tx.Value)
+				}
+
+				ui.win.Root().Call("setWalletValue", fmt.Sprintf("%v", ethutil.CurrencyToString(amount)))
+			}
+		}
+
+		/*
+			accountAmount := ui.eth.BlockManager.GetAddrState(ui.addr).Account.Amount
+			ui.win.Root().Call("setWalletValue", fmt.Sprintf("%v", accountAmount))
+
+			ui.win.Root().Call("setPeers", fmt.Sprintf("%d / %d", ui.eth.Peers().Len(), ui.eth.MaxPeers))
+
+			time.Sleep(1 * time.Second)
+		*/
+
+	}
+}
+
+// Logging functions that log directly to the GUI interface
+func (ui *Gui) Println(v ...interface{}) {
+	str := strings.TrimRight(fmt.Sprintln(v...), "\n")
+	lines := strings.Split(str, "\n")
+	for _, line := range lines {
+		ui.win.Root().Call("addLog", line)
+	}
+}
+
+func (ui *Gui) Printf(format string, v ...interface{}) {
+	str := strings.TrimRight(fmt.Sprintf(format, v...), "\n")
+	lines := strings.Split(str, "\n")
+	for _, line := range lines {
+		ui.win.Root().Call("addLog", line)
+	}
+}

ui/library.go

@@ -0,0 +1,60 @@
+package ethui
+
+import (
+	"encoding/hex"
+	"fmt"
+	"github.com/ethereum/eth-go/ethchain"
+	"github.com/ethereum/eth-go/ethutil"
+	"strings"
+)
+
+type EthLib struct {
+	blockManager *ethchain.BlockManager
+	blockChain   *ethchain.BlockChain
+	txPool       *ethchain.TxPool
+}
+
+func (lib *EthLib) CreateTx(receiver, a, data string) string {
+	var hash []byte
+	if len(receiver) == 0 {
+		hash = ethchain.ContractAddr
+	} else {
+		var err error
+		hash, err = hex.DecodeString(receiver)
+		if err != nil {
+			return err.Error()
+		}
+	}
+
+	k, _ := ethutil.Config.Db.Get([]byte("KeyRing"))
+	keyRing := ethutil.NewValueFromBytes(k)
+
+	amount := ethutil.Big(a)
+	code := ethchain.Compile(strings.Split(data, "\n"))
+	tx := ethchain.NewTransaction(hash, amount, code)
+	tx.Nonce = lib.blockManager.GetAddrState(keyRing.Get(1).Bytes()).Nonce
+
+	tx.Sign(keyRing.Get(0).Bytes())
+
+	lib.txPool.QueueTransaction(tx)
+
+	if len(receiver) == 0 {
+		ethutil.Config.Log.Infof("Contract addr %x", tx.Hash()[12:])
+	} else {
+		ethutil.Config.Log.Infof("Tx hash %x", tx.Hash())
+	}
+
+	return ethutil.Hex(tx.Hash())
+}
+
+func (lib *EthLib) GetBlock(hexHash string) *Block {
+	hash, err := hex.DecodeString(hexHash)
+	if err != nil {
+		return nil
+	}
+
+	block := lib.blockChain.GetBlock(hash)
+	fmt.Println(block)
+
+	return &Block{Number: int(block.BlockInfo().Number), Hash: ethutil.Hex(block.Hash())}
+}

ui/ui_lib.go

@@ -0,0 +1,40 @@
+package ethui
+
+import (
+	"github.com/ethereum/eth-go"
+	"github.com/ethereum/eth-go/ethutil"
+	"github.com/niemeyer/qml"
+)
+
+// UI Library that has some basic functionality exposed
+type UiLib struct {
+	engine    *qml.Engine
+	eth       *eth.Ethereum
+	connected bool
+}
+
+// Opens a QML file (external application)
+func (ui *UiLib) Open(path string) {
+	component, err := ui.engine.LoadFile(path[7:])
+	if err != nil {
+		ethutil.Config.Log.Debugln(err)
+	}
+	win := component.CreateWindow(nil)
+
+	go func() {
+		win.Show()
+		win.Wait()
+	}()
+}
+
+func (ui *UiLib) Connect(button qml.Object) {
+	if !ui.connected {
+		ui.eth.Start()
+		ui.connected = true
+		button.Set("enabled", false)
+	}
+}
+
+func (ui *UiLib) ConnectToPeer(addr string) {
+	ui.eth.ConnectToPeer(addr)
+}

wallet.qml

@@ -0,0 +1,357 @@
+import QtQuick 2.0
+import QtQuick.Controls 1.0;
+import QtQuick.Layouts 1.0;
+import QtQuick.Dialogs 1.0;
+import QtQuick.Window 2.1;
+import QtQuick.Controls.Styles 1.1
+import Ethereum 1.0
+
+ApplicationWindow {
+	id: root
+
+	width: 900
+	height: 600
+	minimumHeight: 300
+
+	title: "Ethereal"
+
+	MenuBar {
+		Menu {
+			title: "File"
+			MenuItem {
+				text: "Import App"
+				shortcut: "Ctrl+o"
+				onTriggered: openAppDialog.open()
+			}
+		}
+
+		Menu {
+			title: "Network"
+			MenuItem {
+				text: "Add Peer"
+				shortcut: "Ctrl+p"
+				onTriggered: {
+					addPeerWin.visible = true
+				}
+			}
+
+			MenuItem {
+				text: "Start"
+				onTriggered: ui.connect()
+			}
+		}
+
+		Menu {
+			title: "Help"
+			MenuItem {
+				text: "About"
+				onTriggered: {
+					aboutWin.visible = true
+				}
+			}
+		}
+
+	}
+
+
+	property var blockModel: ListModel {
+		id: blockModel
+	}
+
+	function setView(view) {
+		networkView.visible = false
+		historyView.visible = false
+		newTxView.visible = false
+		view.visible = true
+		//root.title = "Ethereal - " = view.title
+	}
+
+	SplitView {
+		anchors.fill: parent
+		resizing: false
+
+		Rectangle {
+			id: menu
+			Layout.minimumWidth: 80
+			Layout.maximumWidth: 80
+			anchors.bottom: parent.bottom
+			anchors.top: parent.top
+			//color: "#D9DDE7"
+			color: "#252525"
+
+			ColumnLayout {
+				y: 50
+				anchors.left: parent.left
+				anchors.right: parent.right
+				height: 200
+				Image {
+					source: "tx.png"
+					anchors.horizontalCenter: parent.horizontalCenter
+					MouseArea {
+						anchors.fill: parent
+						onClicked: {
+							setView(historyView)
+						}
+					}
+				}
+				Image {
+					source: "new.png"
+					anchors.horizontalCenter: parent.horizontalCenter
+					MouseArea {
+						anchors.fill: parent
+						onClicked: {
+							setView(newTxView)
+						}
+					}
+				}
+				Image {
+					source: "net.png"
+					anchors.horizontalCenter: parent.horizontalCenter
+					MouseArea {
+						anchors.fill: parent
+						onClicked: {
+							setView(networkView)
+						}
+					}
+				}
+			}
+						
+		}
+
+		property var txModel: ListModel {
+			id: txModel
+		}
+
+		Rectangle {
+			id: historyView
+			property var title: "Transactions"
+			anchors.right: parent.right
+			anchors.left: menu.right
+			anchors.bottom: parent.bottom
+			anchors.top: parent.top
+			TableView {
+				id: txTableView
+				anchors.fill: parent
+				TableViewColumn{ role: "value" ; title: "Value" ; width: 100 }
+				TableViewColumn{ role: "address" ; title: "Address" ; width: 430 }
+
+				model: txModel
+			}
+		}
+
+		Rectangle {
+			id: newTxView
+			property var title: "New transaction"
+			visible: false
+			anchors.right: parent.right
+			anchors.left: menu.right
+			anchors.bottom: parent.bottom
+			anchors.top: parent.top
+			color: "#00000000"
+
+			ColumnLayout {
+				width: 400
+				anchors.left: parent.left
+				anchors.top: parent.top
+				anchors.leftMargin: 5
+				anchors.topMargin: 5
+				TextField {
+					id: txAmount
+					width: 200
+					placeholderText: "Amount"
+				}
+
+				TextField {
+					id: txReceiver
+					placeholderText: "Receiver Address (or empty for contract)"
+					Layout.fillWidth: true
+				}
+
+				Label {
+					text: "Transaction data"
+				}
+				TextArea {
+					id: codeView
+					anchors.topMargin: 5
+					Layout.fillWidth: true
+					width: parent.width /2 
+				}
+
+				Button {
+					text: "Send"
+					onClicked: {
+						console.log(eth.createTx(txReceiver.text, txAmount.text, codeView.text))
+					}
+				}
+			}
+		}
+
+
+		Rectangle {
+			id: networkView
+			property var title: "Network"
+			visible: false
+			anchors.right: parent.right
+			anchors.bottom: parent.bottom
+			anchors.top: parent.top
+
+			TableView {
+				id: blockTable
+				width: parent.width
+				anchors.top: parent.top
+				anchors.bottom: logView.top
+				TableViewColumn{ role: "number" ; title: "#" ; width: 100 }
+				TableViewColumn{ role: "hash" ; title: "Hash" ; width: 560 }
+
+				model: blockModel
+
+				onDoubleClicked: {
+					popup.visible = true
+					popup.block = eth.getBlock(blockModel.get(row).hash)
+					popup.hashLabel.text = popup.block.hash
+				}
+			}
+
+			property var logModel: ListModel {
+				id: logModel
+			}
+
+			TableView {
+				id: logView
+				width: parent.width
+				height: 150
+				anchors.bottom: parent.bottom
+				TableViewColumn{ role: "description" ; title: "log" }
+
+				model: logModel
+			}
+		}
+	}
+
+	FileDialog {
+		id: openAppDialog
+		title: "Open QML Application"
+		onAccepted: {
+			ui.open(openAppDialog.fileUrl.toString())
+		}
+	}
+
+	statusBar: StatusBar {
+		RowLayout {
+			anchors.fill: parent
+			Button {
+				property var enabled: true
+				id: connectButton
+				onClicked: {
+					if(this.enabled) {
+						ui.connect(this)
+					}
+				}
+				text: "Connect"
+			}
+			Button {
+				id: importAppButton
+				anchors.left: connectButton.right
+				anchors.leftMargin: 5
+				onClicked: openAppDialog.open()
+				text: "Import App"
+			}
+
+			Label {
+				anchors.left: importAppButton.right
+				anchors.leftMargin: 5
+				id: walletValueLabel
+			}
+
+			Label {
+				anchors.right: peerImage.left
+				anchors.rightMargin: 5
+				id: peerLabel
+				font.pixelSize: 8
+				text: "0 / 0"
+			}
+			Image {
+				id: peerImage
+				anchors.right: parent.right
+				width: 10; height: 10
+				source: "network.png"
+			}
+		}
+	}
+
+	Window {
+		id: popup
+		visible: false
+		property var block
+		Label {
+			id: hashLabel
+			anchors.horizontalCenter: parent.horizontalCenter
+			anchors.verticalCenter: parent.verticalCenter
+		}
+	}
+
+	Window {
+		id: addPeerWin
+		visible: false
+		minimumWidth: 230
+		maximumWidth: 230
+		maximumHeight: 50
+		minimumHeight: 50
+
+		TextField {
+			id: addrField
+			anchors.verticalCenter: parent.verticalCenter
+			anchors.left: parent.left
+			anchors.leftMargin: 10
+			placeholderText: "address:port"
+		}
+		Button {
+			anchors.left: addrField.right
+			anchors.verticalCenter: parent.verticalCenter
+			anchors.leftMargin: 5
+			text: "Add"
+			onClicked: {
+				ui.connectToPeer(addrField.text)
+				addPeerWin.visible = false
+			}
+		}
+	}
+
+	Window {
+		id: aboutWin
+		visible: false
+		title: "About"
+		minimumWidth: 300
+		maximumWidth: 300
+		maximumHeight: 200
+		minimumHeight: 200
+
+		Text {
+			font.pointSize: 18
+			text: "Eth Go"
+		}
+
+	}
+
+	function setWalletValue(value) {
+		walletValueLabel.text = value
+	}
+
+	function addTx(tx) {
+		txModel.insert(0, {hash: tx.hash, address: tx.address, value: tx.value})
+	}
+
+	function addBlock(block) {
+		blockModel.insert(0, {number: block.number, hash: block.hash})
+	}
+
+	function addLog(str) {
+		if(str.len != 0) {
+			logModel.append({description: str})
+		}
+	}
+
+	function setPeers(text) {
+		peerLabel.text = text
+	}
+}