path: root/ethereal/ui/gui.go

package ethui

import (
    "bytes"
    "fmt"
    "github.com/ethereum/eth-go"
    "github.com/ethereum/eth-go/ethchain"
    "github.com/ethereum/eth-go/ethdb"
    "github.com/ethereum/eth-go/ethpub"
    "github.com/ethereum/eth-go/ethutil"
    "github.com/go-qml/qml"
    "github.com/obscuren/mutan"
    "math/big"
    "strings"
)

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
    uiLib *UiLib

    txDb *ethdb.LDBDatabase

    addr []byte

    pub *ethpub.PEthereum
}

// Create GUI, but doesn't start it
func New(ethereum *eth.Ethereum) *Gui {
    lib := &EthLib{stateManager: ethereum.StateManager(), blockChain: ethereum.BlockChain(), txPool: ethereum.TxPool()}
    db, err := ethdb.NewLDBDatabase("tx_database")
    if err != nil {
        panic(err)
    }

    // On first run we won't have any keys yet, so this would crash.
    // Therefor we check if we are ready to actually start this process
    var addr []byte
    if ethutil.GetKeyRing().Len() != 0 {
        addr = ethutil.GetKeyRing().Get(0).Address()
    }

    pub := ethpub.NewPEthereum(ethereum)

    return &Gui{eth: ethereum, lib: lib, txDb: db, addr: addr, pub: pub}
}

func (gui *Gui) Start(assetPath string) {
    const version = "0.5.0 RC8"

    defer gui.txDb.Close()

    // Register ethereum functions
    qml.RegisterTypes("Ethereum", 1, 0, []qml.TypeSpec{{
        Init: func(p *ethpub.PBlock, obj qml.Object) { p.Number = 0; p.Hash = "" },
    }, {
        Init: func(p *ethpub.PTx, obj qml.Object) { p.Value = ""; p.Hash = ""; p.Address = "" },
    }})

    ethutil.Config.SetClientString(fmt.Sprintf("/Ethereal v%s", version))
    ethutil.Config.Log.Infoln("[GUI] Starting GUI")
    // Create a new QML engine
    gui.engine = qml.NewEngine()
    context := gui.engine.Context()

    // Expose the eth library and the ui library to QML
    context.SetVar("eth", gui)
    context.SetVar("pub", gui.pub)
    gui.uiLib = NewUiLib(gui.engine, gui.eth, assetPath)
    context.SetVar("ui", gui.uiLib)

    // Load the main QML interface
    data, _ := ethutil.Config.Db.Get([]byte("KeyRing"))

    var win *qml.Window
    var err error
    if len(data) == 0 {
        win, err = gui.showKeyImport(context)
    } else {
        win, err = gui.showWallet(context)
    }
    if err != nil {
        ethutil.Config.Log.Infoln("FATAL: asset not found: you can set an alternative asset path on on the command line using option 'asset_path'")

        panic(err)
    }

    win.Show()
    win.Wait()

    gui.eth.Stop()
}

func (gui *Gui) showWallet(context *qml.Context) (*qml.Window, error) {
    component, err := gui.engine.LoadFile(gui.uiLib.AssetPath("qml/wallet.qml"))
    if err != nil {
        return nil, err
    }

    win := gui.createWindow(component)

    go gui.setInitialBlockChain()
    go gui.readPreviousTransactions()
    go gui.update()

    return win, nil
}

func (gui *Gui) showKeyImport(context *qml.Context) (*qml.Window, error) {
    context.SetVar("lib", gui.lib)
    component, err := gui.engine.LoadFile(gui.uiLib.AssetPath("qml/first_run.qml"))
    if err != nil {
        return nil, err
    }

    return gui.createWindow(component), nil
}

func (gui *Gui) createWindow(comp qml.Object) *qml.Window {
    win := comp.CreateWindow(nil)

    gui.win = win
    gui.uiLib.win = win

    db := &Debugger{gui.win, make(chan bool)}
    gui.lib.Db = db
    gui.uiLib.Db = db

    return gui.win
}

func (gui *Gui) setInitialBlockChain() {
    // Load previous 10 blocks
    chain := gui.eth.BlockChain().GetChain(gui.eth.BlockChain().CurrentBlock.Hash(), 10)
    for _, block := range chain {
        gui.processBlock(block)
    }

}

func (gui *Gui) readPreviousTransactions() {
    it := gui.txDb.Db().NewIterator(nil, nil)
    for it.Next() {
        tx := ethchain.NewTransactionFromBytes(it.Value())

        gui.win.Root().Call("addTx", ethpub.NewPTx(tx))
    }
    it.Release()
}

func (gui *Gui) processBlock(block *ethchain.Block) {
    gui.win.Root().Call("addBlock", ethpub.NewPBlock(block))
}

func (gui *Gui) setWalletValue(amount, unconfirmedFunds *big.Int) {
    var str string
    if unconfirmedFunds != nil {
        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(amount), pos, val)
    } else {
        str = fmt.Sprintf("%v", ethutil.CurrencyToString(amount))
    }

    gui.win.Root().Call("setWalletValue", str)
}

// Simple go routine function that updates the list of peers in the GUI
func (gui *Gui) update() {
    reactor := gui.eth.Reactor()

    blockChan := make(chan ethutil.React, 1)
    txChan := make(chan ethutil.React, 1)

    reactor.Subscribe("newBlock", blockChan)
    reactor.Subscribe("newTx:pre", txChan)
    reactor.Subscribe("newTx:post", txChan)

    state := gui.eth.StateManager().TransState()

    unconfirmedFunds := new(big.Int)
    gui.win.Root().Call("setWalletValue", fmt.Sprintf("%v", ethutil.CurrencyToString(state.GetAccount(gui.addr).Amount)))

    for {
        select {
        case b := <-blockChan:
            block := b.Resource.(*ethchain.Block)
            if bytes.Compare(block.Coinbase, gui.addr) == 0 {
                gui.setWalletValue(gui.eth.StateManager().CurrentState().GetAccount(gui.addr).Amount, nil)
            }

        case txMsg := <-txChan:
            tx := txMsg.Resource.(*ethchain.Transaction)

            if txMsg.Event == "newTx:pre" {
                object := state.GetAccount(gui.addr)

                if bytes.Compare(tx.Sender(), gui.addr) == 0 {
                    gui.win.Root().Call("addTx", ethpub.NewPTx(tx))
                    gui.txDb.Put(tx.Hash(), tx.RlpEncode())

                    unconfirmedFunds.Sub(unconfirmedFunds, tx.Value)
                } else if bytes.Compare(tx.Recipient, gui.addr) == 0 {
                    gui.win.Root().Call("addTx", ethpub.NewPTx(tx))
                    gui.txDb.Put(tx.Hash(), tx.RlpEncode())

                    unconfirmedFunds.Add(unconfirmedFunds, tx.Value)
                }

                gui.setWalletValue(object.Amount, unconfirmedFunds)
            } else {
                object := state.GetAccount(gui.addr)
                if bytes.Compare(tx.Sender(), gui.addr) == 0 {
                    object.SubAmount(tx.Value)
                } else if bytes.Compare(tx.Recipient, gui.addr) == 0 {
                    object.AddAmount(tx.Value)
                }

                gui.setWalletValue(object.Amount, nil)

                state.UpdateStateObject(object)
            }
        }
    }
}

// Logging functions that log directly to the GUI interface
func (gui *Gui) Println(v ...interface{}) {
    str := strings.TrimRight(fmt.Sprintln(v...), "\n")
    lines := strings.Split(str, "\n")
    for _, line := range lines {
        gui.win.Root().Call("addLog", line)
    }
}

func (gui *Gui) Printf(format string, v ...interface{}) {
    str := strings.TrimRight(fmt.Sprintf(format, v...), "\n")
    lines := strings.Split(str, "\n")
    for _, line := range lines {
        gui.win.Root().Call("addLog", line)
    }
}

func (gui *Gui) Transact(recipient, value, gas, gasPrice, data string) (*ethpub.PReceipt, error) {
    keyPair := ethutil.GetKeyRing().Get(0)

    return gui.pub.Transact(ethutil.Hex(keyPair.PrivateKey), recipient, value, gas, gasPrice, data)
}

func (gui *Gui) Create(recipient, value, gas, gasPrice, data string) (*ethpub.PReceipt, error) {
    keyPair := ethutil.GetKeyRing().Get(0)

    mainInput, initInput := mutan.PreParse(data)

    return gui.pub.Create(ethutil.Hex(keyPair.PrivateKey), value, gas, gasPrice, initInput, mainInput)
}