public void run() {
PeerDiscovery peerDiscovery = new DnsDiscovery(NetworkParameters.prodNet());
try {
while (true) {
InetSocketAddress addresses[] = peerDiscovery.getPeers();
// InetSocketAddress addresses[]={new InetSocketAddress("localhost",8333)};
System.out.println("peers " + addresses.length);
NetworkConnection conn;
Peer peer;
System.out.println("connecting to peers");
for (InetSocketAddress a : addresses) {
try {
System.out.println("Trying " + a);
conn =
new NetworkConnection(
a.getAddress(),
Bitten.networkParameters,
blockChain.getChainHead().getHeight(),
3000);
System.out.println("after network connection");
peer = new Peer(Bitten.networkParameters, conn, blockChain);
System.out.println("starting chain download");
peer.start();
peer.startBlockChainDownload();
while (true) {
if (!peer.running()) {
System.out.println("peer stopped!");
break;
}
sleep(1000);
}
} catch (IOException e) {
System.out.println(e);
continue;
} catch (ProtocolException e) {
continue;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
continue;
}
}
}
} catch (PeerDiscoveryException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) throws Exception {
BriefLogFormatter.init();
// Sorted map of UNIX time of block to StoredBlock object.
final TreeMap<Integer, StoredBlock> checkpoints = new TreeMap<Integer, StoredBlock>();
// Configure bitcoinj to fetch only headers, not save them to disk, connect to a local fully
// synced/validated
// node and to save block headers that are on interval boundaries, as long as they are <1 month
// old.
final BlockStore store = new MemoryBlockStore(PARAMS);
final BlockChain chain = new BlockChain(PARAMS, store);
final PeerGroup peerGroup = new PeerGroup(PARAMS, chain);
peerGroup.addAddress(InetAddress.getLocalHost());
// peerGroup.addAddress(InetAddress.getByName("69.164.198.161"));
long now = new Date().getTime() / 1000;
peerGroup.setFastCatchupTimeSecs(now);
final long oneMonthAgo = now - (86400 * 2);
chain.addListener(
new AbstractBlockChainListener() {
@Override
public void notifyNewBestBlock(StoredBlock block) throws VerificationException {
int height = block.getHeight();
if (height % CoinDefinition.getIntervalCheckpoints() == 0
&& block.getHeader().getTimeSeconds() <= oneMonthAgo) {
// if (height % PARAMS.getInterval() == 0 &&
// block.getHeader().getTimeSeconds() <= oneMonthAgo) {
System.out.println(
String.format(
"Checkpointing block %s at height %d",
block.getHeader().getHash(), block.getHeight()));
checkpoints.put(height, block);
}
}
},
Threading.SAME_THREAD);
peerGroup.startAndWait();
peerGroup.downloadBlockChain();
checkState(checkpoints.size() > 0);
// Write checkpoint data out.
final FileOutputStream fileOutputStream = new FileOutputStream(CHECKPOINTS_FILE, false);
MessageDigest digest = MessageDigest.getInstance("SHA-256");
final DigestOutputStream digestOutputStream = new DigestOutputStream(fileOutputStream, digest);
digestOutputStream.on(false);
final DataOutputStream dataOutputStream = new DataOutputStream(digestOutputStream);
dataOutputStream.writeBytes("CHECKPOINTS 1");
dataOutputStream.writeInt(0); // Number of signatures to read. Do this later.
digestOutputStream.on(true);
dataOutputStream.writeInt(checkpoints.size());
ByteBuffer buffer = ByteBuffer.allocate(StoredBlock.COMPACT_SERIALIZED_SIZE);
for (StoredBlock block : checkpoints.values()) {
block.serializeCompact(buffer);
dataOutputStream.write(buffer.array());
buffer.position(0);
}
dataOutputStream.close();
Sha256Hash checkpointsHash = new Sha256Hash(digest.digest());
System.out.println("Hash of checkpoints data is " + checkpointsHash);
digestOutputStream.close();
fileOutputStream.close();
peerGroup.stopAndWait();
store.close();
// Sanity check the created file.
CheckpointManager manager =
new CheckpointManager(PARAMS, new FileInputStream(CHECKPOINTS_FILE));
checkState(manager.numCheckpoints() == checkpoints.size());
/*if (PARAMS.getId() == NetworkParameters.ID_MAINNET) {
StoredBlock test = manager.getCheckpointBefore(1390500000); // Thu Jan 23 19:00:00 CET 2014
checkState(test.getHeight() == 280224);
checkState(test.getHeader().getHashAsString()
.equals("00000000000000000b5d59a15f831e1c45cb688a4db6b0a60054d49a9997fa34"));
} else if (PARAMS.getId() == NetworkParameters.ID_TESTNET) {
StoredBlock test = manager.getCheckpointBefore(1390500000); // Thu Jan 23 19:00:00 CET 2014
checkState(test.getHeight() == 167328);
checkState(test.getHeader().getHashAsString()
.equals("0000000000035ae7d5025c2538067fe7adb1cf5d5d9c31b024137d9090ed13a9"));
}*/
System.out.println("Checkpoints written to '" + CHECKPOINTS_FILE.getCanonicalPath() + "'.");
}