private static void syncChain() {
try {
setup();
int startTransactions = wallet.getTransactions(true).size();
DownloadListener listener = new DownloadListener();
peers.startAndWait();
peers.startBlockChainDownload(listener);
try {
listener.await();
} catch (InterruptedException e) {
System.err.println("Chain download interrupted, quitting ...");
System.exit(1);
}
int endTransactions = wallet.getTransactions(true).size();
if (endTransactions > startTransactions) {
System.out.println("Synced " + (endTransactions - startTransactions) + " transactions.");
}
} catch (BlockStoreException e) {
System.err.println("Error reading block chain file " + chainFileName + ": " + e.getMessage());
e.printStackTrace();
}
}
// Sets up all objects needed for network communication but does not bring up the peers.
private static void setup() throws BlockStoreException {
if (store != null) return; // Already done.
// Will create a fresh chain if one doesn't exist or there is an issue with this one.
if (!chainFileName.exists() && wallet.getTransactions(true).size() > 0) {
// No chain, so reset the wallet as we will be downloading from scratch.
System.out.println("Chain file is missing so clearing transactions from the wallet.");
reset();
}
if (mode == ValidationMode.SPV) {
store = new SPVBlockStore(params, chainFileName);
chain = new BlockChain(params, wallet, store);
} else if (mode == ValidationMode.FULL) {
FullPrunedBlockStore s =
new H2FullPrunedBlockStore(params, chainFileName.getAbsolutePath(), 5000);
store = s;
chain = new FullPrunedBlockChain(params, wallet, s);
}
// This will ensure the wallet is saved when it changes.
wallet.autosaveToFile(walletFile, 200, TimeUnit.MILLISECONDS, null);
peers = new PeerGroup(params, chain);
peers.setUserAgent("WalletTool", "1.0");
peers.addWallet(wallet);
if (options.has("peers")) {
String peersFlag = (String) options.valueOf("peers");
String[] peerAddrs = peersFlag.split(",");
for (String peer : peerAddrs) {
try {
peers.addAddress(new PeerAddress(InetAddress.getByName(peer), params.getPort()));
} catch (UnknownHostException e) {
System.err.println(
"Could not understand peer domain name/IP address: " + peer + ": " + e.getMessage());
System.exit(1);
}
}
} else {
peers.addPeerDiscovery(new DnsDiscovery(params));
}
}