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Add an ugly toy wallet app, which will evolve into a more fully fledged example of a MultiBit style app. This keeps it obvious how much boilerplate type code is needed and what other features might be helpful. Currently it just shows transactions received with their confidences.
This commit is contained in:
Mike Hearn
Miron Cuperman
parent
37ff135638
commit
2ef9fa389c
240
src/com/google/bitcoin/examples/toywallet/ToyWallet.java
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240
src/com/google/bitcoin/examples/toywallet/ToyWallet.java
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/*
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* Copyright 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.bitcoin.examples.toywallet;
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import com.google.bitcoin.core.*;
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import com.google.bitcoin.discovery.DnsDiscovery;
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import com.google.bitcoin.store.DiskBlockStore;
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import com.google.bitcoin.utils.BriefLogFormatter;
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import javax.swing.*;
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import java.awt.*;
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import java.io.File;
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import java.io.IOException;
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import java.math.BigInteger;
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import java.net.InetAddress;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Set;
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/**
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* A GUI demo that lets you watch received transactions as they accumulate confidence.
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*/
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public class ToyWallet {
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private final TxListModel txListModel = new TxListModel();
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private JList txList;
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private NetworkParameters params;
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private Wallet wallet;
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private PeerGroup peerGroup;
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private BlockChain chain;
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private JLabel networkStats;
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private File walletFile;
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public static void main(String[] args) throws Exception {
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BriefLogFormatter.init();
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new ToyWallet(true);
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}
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public ToyWallet(boolean testnet) throws Exception {
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// Set up a Bitcoin connection + empty wallet. TODO: Simplify the setup for this use case.
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if (testnet) {
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params = NetworkParameters.testNet();
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} else {
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params = NetworkParameters.prodNet();
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}
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wallet = getWallet(params);
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System.out.println("Send to: " + wallet.keychain.get(0).toAddress(params));
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System.out.println(wallet);
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chain = new BlockChain(params, wallet, new DiskBlockStore(params, new File("toy.blockchain")));
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peerGroup = new PeerGroup(params, chain);
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if (testnet) {
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peerGroup.addAddress(new PeerAddress(InetAddress.getByName("plan99.net"), 18333));
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peerGroup.addAddress(new PeerAddress(InetAddress.getByName("localhost"), 18333));
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} else {
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peerGroup.addPeerDiscovery(new DnsDiscovery(params));
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}
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peerGroup.addWallet(wallet);
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// Watch for peers coming and going, and new blocks, so we can update the UI.
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peerGroup.addEventListener(new AbstractPeerEventListener() {
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@Override
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public void onPeerConnected(Peer peer, int peerCount) {
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super.onPeerConnected(peer, peerCount);
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triggerNetworkStatsUpdate(peerCount);
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}
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@Override
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public void onPeerDisconnected(Peer peer, int peerCount) {
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super.onPeerDisconnected(peer, peerCount);
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triggerNetworkStatsUpdate(peerCount);
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}
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@Override
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public void onBlocksDownloaded(Peer peer, Block block, int blocksLeft) {
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super.onBlocksDownloaded(peer, block, blocksLeft);
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handleNewBlock();
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}
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});
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wallet.addEventListener(new AbstractWalletEventListener() {
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@Override
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public void onCoinsReceived(Wallet wallet, Transaction tx, BigInteger prevBalance, BigInteger newBalance) {
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super.onCoinsReceived(wallet, tx, prevBalance, newBalance);
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handleNewTransaction(tx);
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}
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@Override
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public void onChange() {
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try {
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System.out.println("Wallet changed");
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wallet.saveToFile(walletFile);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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});
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// Create the GUI.
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JFrame window = new JFrame("Toy wallet");
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window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setupWindow(window);
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window.pack();
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window.setSize(640, 480);
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// Put the transactions stored in the wallet, into the GUI.
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final Set<Transaction> walletTransactions = wallet.getTransactions(true, true);
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SwingUtilities.invokeAndWait(new Runnable() {
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public void run() {
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for (final Transaction tx : walletTransactions) {
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txListModel.monitorTx(tx);
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}
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}
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});
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// Go!
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window.setVisible(true);
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peerGroup.start();
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peerGroup.downloadBlockChain();
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}
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private Wallet getWallet(NetworkParameters params) throws IOException {
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// Try to read the wallet from storage, create a new one if not possible.
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walletFile = new File("toy.wallet");
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Wallet w;
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try {
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w = Wallet.loadFromFile(walletFile);
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} catch (IOException e) {
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w = new Wallet(params);
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w.keychain.add(new ECKey());
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w.saveToFile(walletFile);
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}
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return w;
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}
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private void handleNewBlock() {
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SwingUtilities.invokeLater(new Runnable() {
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public void run() {
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txListModel.newBlock();
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}
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});
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}
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private void handleNewTransaction(final Transaction t) {
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// Running on a peer thread, switch to Swing thread before adding and updating the UI.
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SwingUtilities.invokeLater(new Runnable() {
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public void run() {
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txListModel.monitorTx(t);
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}
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});
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}
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private void triggerNetworkStatsUpdate(final int numPeersNow) {
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// Running on a peer thread, switch to Swing thread before updating the peer count label.
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SwingUtilities.invokeLater(new Runnable() {
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public void run() {
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networkStats.setText(String.format("%d %s connected. %d blocks", numPeersNow, numPeersNow > 1 ? "peers" : "peer",
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chain.getBestChainHeight()));
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}
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});
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}
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private void setupWindow(JFrame window) {
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JLabel instructions = new JLabel(
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"<html>Broadcast transactions appear below. Watch them gain confidence.<br>" +
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"Send coins to: <b>" + wallet.keychain.get(0).toAddress(params) + "</b>");
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window.getContentPane().add(instructions, BorderLayout.NORTH);
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// The list of transactions.
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txList = new JList(txListModel);
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txList.setCellRenderer(new TxListLabel());
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window.getContentPane().add(txList, BorderLayout.CENTER);
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networkStats = new JLabel("Connecting to the Bitcoin network ...");
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window.getContentPane().add(networkStats, BorderLayout.SOUTH);
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}
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// Object that manages the contents of the list view.
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private class TxListModel extends AbstractListModel {
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private List<Transaction> transactions = new ArrayList<Transaction>();
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public void monitorTx(Transaction tx) {
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assert SwingUtilities.isEventDispatchThread();
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transactions.add(tx);
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// Set up a tx confidence change event listener, so we know when to update the list.
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tx.getConfidence().addEventListener(new TransactionConfidence.Listener() {
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public void onConfidenceChanged(Transaction tx) {
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// Note that this does NOT get called for every block that is received, just when we transition
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// between confidence states.
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int txIndex = transactions.indexOf(tx);
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fireContentsChanged(this, txIndex, txIndex);
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}
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});
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fireIntervalAdded(this, transactions.size() - 1, transactions.size() - 1);
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}
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public int getSize() {
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return transactions.size();
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}
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public Object getElementAt(int i) {
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Transaction tx = transactions.get(i);
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return tx.toString() + "\n" + tx.getConfidence().toString();
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}
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public void newBlock() {
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fireContentsChanged(this, 0, getSize() - 1);
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}
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}
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private class TxListLabel extends JLabel implements ListCellRenderer {
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public Component getListCellRendererComponent(JList list, Object contents,
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int index, boolean isSelected,
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boolean cellHasFocus) {
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String value = (String) contents;
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final String key = wallet.keychain.get(0).toAddress(params).toString();
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value = "<html>" + value.replaceAll("\n", "<br>").replaceAll("<br> ", "<br> ")
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.replaceAll(key, "<i>" + key + "</i>");
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setText(value);
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setOpaque(true);
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setBackground(index % 2 == 1 ? new Color(50, 50, 50) : Color.WHITE);
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return this;
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}
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}
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}
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