path: root/ui/gui.go

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)
    }
}