@Test
public void pingPong() throws Exception {
connect();
Utils.rollMockClock(0);
// No ping pong happened yet.
assertEquals(Long.MAX_VALUE, peer.getLastPingTime());
assertEquals(Long.MAX_VALUE, peer.getPingTime());
ListenableFuture<Long> future = peer.ping();
assertEquals(Long.MAX_VALUE, peer.getLastPingTime());
assertEquals(Long.MAX_VALUE, peer.getPingTime());
assertFalse(future.isDone());
Ping pingMsg = (Ping) outbound(writeTarget);
Utils.rollMockClock(5);
// The pong is returned.
inbound(writeTarget, new Pong(pingMsg.getNonce()));
pingAndWait(writeTarget);
assertTrue(future.isDone());
long elapsed = future.get();
assertTrue("" + elapsed, elapsed > 1000);
assertEquals(elapsed, peer.getLastPingTime());
assertEquals(elapsed, peer.getPingTime());
// Do it again and make sure it affects the average.
future = peer.ping();
pingMsg = (Ping) outbound(writeTarget);
Utils.rollMockClock(50);
inbound(writeTarget, new Pong(pingMsg.getNonce()));
elapsed = future.get();
assertEquals(elapsed, peer.getLastPingTime());
assertEquals(7250, peer.getPingTime());
}
@Test
public void invDownloadTxMultiPeer() throws Exception {
// Check co-ordination of which peer to download via the memory pool.
VersionMessage ver = new VersionMessage(unitTestParams, 100);
InetSocketAddress address = new InetSocketAddress("127.0.0.1", 4242);
Peer peer2 = new Peer(unitTestParams, ver, new PeerAddress(address), blockChain, memoryPool);
peer2.addWallet(wallet);
VersionMessage peerVersion = new VersionMessage(unitTestParams, OTHER_PEER_CHAIN_HEIGHT);
peerVersion.clientVersion = 70001;
peerVersion.localServices = VersionMessage.NODE_NETWORK;
connect();
InboundMessageQueuer writeTarget2 = connect(peer2, peerVersion);
// Make a tx and advertise it to one of the peers.
BigInteger value = Utils.toNanoCoins(1, 0);
Transaction tx = createFakeTx(unitTestParams, value, this.address);
InventoryMessage inv = new InventoryMessage(unitTestParams);
InventoryItem item = new InventoryItem(InventoryItem.Type.Transaction, tx.getHash());
inv.addItem(item);
inbound(writeTarget, inv);
// We got a getdata message.
GetDataMessage message = (GetDataMessage) outbound(writeTarget);
assertEquals(1, message.getItems().size());
assertEquals(tx.getHash(), message.getItems().get(0).hash);
assertTrue(memoryPool.maybeWasSeen(tx.getHash()));
// Advertising to peer2 results in no getdata message.
inbound(writeTarget2, inv);
pingAndWait(writeTarget2);
assertNull(outbound(writeTarget2));
}
// Check that inventory message containing blocks we want is processed correctly.
@Test
public void newBlock() throws Exception {
Block b1 = createFakeBlock(blockStore).block;
blockChain.add(b1);
final Block b2 = makeSolvedTestBlock(b1);
// Receive notification of a new block.
final InventoryMessage inv = new InventoryMessage(unitTestParams);
InventoryItem item = new InventoryItem(InventoryItem.Type.Block, b2.getHash());
inv.addItem(item);
final AtomicInteger newBlockMessagesReceived = new AtomicInteger(0);
connect();
// Round-trip a ping so that we never see the response verack if we attach too quick
pingAndWait(writeTarget);
peer.addEventListener(
new AbstractPeerEventListener() {
@Override
public synchronized Message onPreMessageReceived(Peer p, Message m) {
if (p != peer) fail.set(true);
if (m instanceof Pong) return m;
int newValue = newBlockMessagesReceived.incrementAndGet();
if (newValue == 1 && !inv.equals(m)) fail.set(true);
else if (newValue == 2 && !b2.equals(m)) fail.set(true);
else if (newValue > 3) fail.set(true);
return m;
}
@Override
public synchronized void onBlocksDownloaded(Peer p, Block block, int blocksLeft) {
int newValue = newBlockMessagesReceived.incrementAndGet();
if (newValue != 3
|| p != peer
|| !block.equals(b2)
|| blocksLeft != OTHER_PEER_CHAIN_HEIGHT - 2) fail.set(true);
}
},
Threading.SAME_THREAD);
long height = peer.getBestHeight();
inbound(writeTarget, inv);
pingAndWait(writeTarget);
assertEquals(height + 1, peer.getBestHeight());
// Response to the getdata message.
inbound(writeTarget, b2);
pingAndWait(writeTarget);
Threading.waitForUserCode();
pingAndWait(writeTarget);
assertEquals(3, newBlockMessagesReceived.get());
GetDataMessage getdata = (GetDataMessage) outbound(writeTarget);
List<InventoryItem> items = getdata.getItems();
assertEquals(1, items.size());
assertEquals(b2.getHash(), items.get(0).hash);
assertEquals(InventoryItem.Type.Block, items.get(0).type);
}
public void timeLockedTransaction(boolean useNotFound) throws Exception {
connectWithVersion(useNotFound ? 70001 : 60001);
// Test that if we receive a relevant transaction that has a lock time, it doesn't result in a
// notification
// until we explicitly opt in to seeing those.
ECKey key = new ECKey();
Wallet wallet = new Wallet(unitTestParams);
wallet.addKey(key);
peer.addWallet(wallet);
final Transaction[] vtx = new Transaction[1];
wallet.addEventListener(
new AbstractWalletEventListener() {
@Override
public void onCoinsReceived(
Wallet wallet, Transaction tx, BigInteger prevBalance, BigInteger newBalance) {
vtx[0] = tx;
}
});
// Send a normal relevant transaction, it's received correctly.
Transaction t1 = TestUtils.createFakeTx(unitTestParams, Utils.toNanoCoins(1, 0), key);
inbound(writeTarget, t1);
GetDataMessage getdata = (GetDataMessage) outbound(writeTarget);
if (useNotFound) {
inbound(writeTarget, new NotFoundMessage(unitTestParams, getdata.getItems()));
} else {
bouncePing();
}
pingAndWait(writeTarget);
Threading.waitForUserCode();
assertNotNull(vtx[0]);
vtx[0] = null;
// Send a timelocked transaction, nothing happens.
Transaction t2 = TestUtils.createFakeTx(unitTestParams, Utils.toNanoCoins(2, 0), key);
t2.setLockTime(999999);
inbound(writeTarget, t2);
Threading.waitForUserCode();
assertNull(vtx[0]);
// Now we want to hear about them. Send another, we are told about it.
wallet.setAcceptRiskyTransactions(true);
inbound(writeTarget, t2);
getdata = (GetDataMessage) outbound(writeTarget);
if (useNotFound) {
inbound(writeTarget, new NotFoundMessage(unitTestParams, getdata.getItems()));
} else {
bouncePing();
}
pingAndWait(writeTarget);
Threading.waitForUserCode();
assertEquals(t2, vtx[0]);
}
@Test
public void fastCatchup() throws Exception {
connect();
// Check that blocks before the fast catchup point are retrieved using getheaders, and after
// using getblocks.
// This test is INCOMPLETE because it does not check we handle >2000 blocks correctly.
Block b1 = createFakeBlock(blockStore).block;
blockChain.add(b1);
Utils.rollMockClock(60 * 10); // 10 minutes later.
Block b2 = makeSolvedTestBlock(b1);
Utils.rollMockClock(60 * 10); // 10 minutes later.
Block b3 = makeSolvedTestBlock(b2);
Utils.rollMockClock(60 * 10);
Block b4 = makeSolvedTestBlock(b3);
// Request headers until the last 2 blocks.
peer.setDownloadParameters((Utils.now().getTime() / 1000) - (600 * 2) + 1, false);
peer.startBlockChainDownload();
GetHeadersMessage getheaders = (GetHeadersMessage) outbound(writeTarget);
List<Sha256Hash> expectedLocator = new ArrayList<Sha256Hash>();
expectedLocator.add(b1.getHash());
expectedLocator.add(unitTestParams.getGenesisBlock().getHash());
assertEquals(getheaders.getLocator(), expectedLocator);
assertEquals(getheaders.getStopHash(), Sha256Hash.ZERO_HASH);
// Now send all the headers.
HeadersMessage headers =
new HeadersMessage(
unitTestParams, b2.cloneAsHeader(), b3.cloneAsHeader(), b4.cloneAsHeader());
// We expect to be asked for b3 and b4 again, but this time, with a body.
expectedLocator.clear();
expectedLocator.add(b2.getHash());
expectedLocator.add(b1.getHash());
expectedLocator.add(unitTestParams.getGenesisBlock().getHash());
inbound(writeTarget, headers);
GetBlocksMessage getblocks = (GetBlocksMessage) outbound(writeTarget);
assertEquals(expectedLocator, getblocks.getLocator());
assertEquals(Sha256Hash.ZERO_HASH, getblocks.getStopHash());
// We're supposed to get an inv here.
InventoryMessage inv = new InventoryMessage(unitTestParams);
inv.addItem(new InventoryItem(InventoryItem.Type.Block, b3.getHash()));
inbound(writeTarget, inv);
GetDataMessage getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(b3.getHash(), getdata.getItems().get(0).hash);
// All done.
inbound(writeTarget, b3);
pingAndWait(writeTarget);
closePeer(peer);
}
@Test
public void exceptionListener() throws Exception {
wallet.addEventListener(
new AbstractWalletEventListener() {
@Override
public void onCoinsReceived(
Wallet wallet, Transaction tx, BigInteger prevBalance, BigInteger newBalance) {
throw new NullPointerException("boo!");
}
});
final Throwable[] throwables = new Throwable[1];
Threading.uncaughtExceptionHandler =
new Thread.UncaughtExceptionHandler() {
@Override
public void uncaughtException(Thread thread, Throwable throwable) {
throwables[0] = throwable;
}
};
// In real usage we're not really meant to adjust the uncaught exception handler after stuff
// started happening
// but in the unit test environment other tests have just run so the thread is probably still
// kicking around.
// Force it to crash so it'll be recreated with our new handler.
Threading.USER_THREAD.execute(
new Runnable() {
@Override
public void run() {
throw new RuntimeException();
}
});
connect();
Transaction t1 = new Transaction(unitTestParams);
t1.addInput(new TransactionInput(unitTestParams, t1, new byte[] {}));
t1.addOutput(Utils.toNanoCoins(1, 0), new ECKey().toAddress(unitTestParams));
Transaction t2 = new Transaction(unitTestParams);
t2.addInput(t1.getOutput(0));
t2.addOutput(Utils.toNanoCoins(1, 0), wallet.getChangeAddress());
inbound(writeTarget, t2);
final InventoryItem inventoryItem =
new InventoryItem(InventoryItem.Type.Transaction, t2.getInput(0).getOutpoint().getHash());
final NotFoundMessage nfm =
new NotFoundMessage(unitTestParams, Lists.newArrayList(inventoryItem));
inbound(writeTarget, nfm);
pingAndWait(writeTarget);
Threading.waitForUserCode();
assertTrue(throwables[0] instanceof NullPointerException);
Threading.uncaughtExceptionHandler = null;
}
@Test
public void getLargeBlock() throws Exception {
connect();
Block b1 = createFakeBlock(blockStore).block;
blockChain.add(b1);
Block b2 = makeSolvedTestBlock(b1);
Transaction t = new Transaction(unitTestParams);
t.addInput(b1.getTransactions().get(0).getOutput(0));
t.addOutput(
new TransactionOutput(
unitTestParams, t, BigInteger.ZERO, new byte[Block.MAX_BLOCK_SIZE - 1000]));
b2.addTransaction(t);
// Request the block.
Future<Block> resultFuture = peer.getBlock(b2.getHash());
assertFalse(resultFuture.isDone());
// Peer asks for it.
GetDataMessage message = (GetDataMessage) outbound(writeTarget);
assertEquals(message.getItems().get(0).hash, b2.getHash());
assertFalse(resultFuture.isDone());
// Peer receives it.
inbound(writeTarget, b2);
Block b = resultFuture.get();
assertEquals(b, b2);
}
@Test
public void invDownloadTx() throws Exception {
connect();
peer.setDownloadData(true);
// Make a transaction and tell the peer we have it.
BigInteger value = Utils.toNanoCoins(1, 0);
Transaction tx = createFakeTx(unitTestParams, value, address);
InventoryMessage inv = new InventoryMessage(unitTestParams);
InventoryItem item = new InventoryItem(InventoryItem.Type.Transaction, tx.getHash());
inv.addItem(item);
inbound(writeTarget, inv);
// Peer hasn't seen it before, so will ask for it.
GetDataMessage getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(1, getdata.getItems().size());
assertEquals(tx.getHash(), getdata.getItems().get(0).hash);
inbound(writeTarget, tx);
// Ask for the dependency, it's not in the mempool (in chain).
getdata = (GetDataMessage) outbound(writeTarget);
inbound(writeTarget, new NotFoundMessage(unitTestParams, getdata.getItems()));
pingAndWait(writeTarget);
assertEquals(value, wallet.getBalance(Wallet.BalanceType.ESTIMATED));
}
// Check that an inventory tickle is processed correctly when downloading missing blocks is
// active.
@Test
public void invTickle() throws Exception {
connect();
Block b1 = createFakeBlock(blockStore).block;
blockChain.add(b1);
// Make a missing block.
Block b2 = makeSolvedTestBlock(b1);
Block b3 = makeSolvedTestBlock(b2);
inbound(writeTarget, b3);
InventoryMessage inv = new InventoryMessage(unitTestParams);
InventoryItem item = new InventoryItem(InventoryItem.Type.Block, b3.getHash());
inv.addItem(item);
inbound(writeTarget, inv);
GetBlocksMessage getblocks = (GetBlocksMessage) outbound(writeTarget);
List<Sha256Hash> expectedLocator = new ArrayList<Sha256Hash>();
expectedLocator.add(b1.getHash());
expectedLocator.add(unitTestParams.getGenesisBlock().getHash());
assertEquals(getblocks.getLocator(), expectedLocator);
assertEquals(getblocks.getStopHash(), b3.getHash());
assertNull(outbound(writeTarget));
}
@Test
public void getBlock() throws Exception {
connect();
Block b1 = createFakeBlock(blockStore).block;
blockChain.add(b1);
Block b2 = makeSolvedTestBlock(b1);
Block b3 = makeSolvedTestBlock(b2);
// Request the block.
Future<Block> resultFuture = peer.getBlock(b3.getHash());
assertFalse(resultFuture.isDone());
// Peer asks for it.
GetDataMessage message = (GetDataMessage) outbound(writeTarget);
assertEquals(message.getItems().get(0).hash, b3.getHash());
assertFalse(resultFuture.isDone());
// Peer receives it.
inbound(writeTarget, b3);
Block b = resultFuture.get();
assertEquals(b, b3);
}
// Check that an inv to a peer that is not set to download missing blocks does nothing.
@Test
public void invNoDownload() throws Exception {
// Don't download missing blocks.
peer.setDownloadData(false);
connect();
// Make a missing block that we receive.
Block b1 = createFakeBlock(blockStore).block;
blockChain.add(b1);
Block b2 = makeSolvedTestBlock(b1);
// Receive an inv.
InventoryMessage inv = new InventoryMessage(unitTestParams);
InventoryItem item = new InventoryItem(InventoryItem.Type.Block, b2.getHash());
inv.addItem(item);
inbound(writeTarget, inv);
// Peer does nothing with it.
assertNull(outbound(writeTarget));
}
private void checkTimeLockedDependency(boolean shouldAccept, boolean useNotFound)
throws Exception {
// Initial setup.
connectWithVersion(useNotFound ? 70001 : 60001);
ECKey key = new ECKey();
Wallet wallet = new Wallet(unitTestParams);
wallet.addKey(key);
wallet.setAcceptRiskyTransactions(shouldAccept);
peer.addWallet(wallet);
final Transaction[] vtx = new Transaction[1];
wallet.addEventListener(
new AbstractWalletEventListener() {
@Override
public void onCoinsReceived(
Wallet wallet, Transaction tx, BigInteger prevBalance, BigInteger newBalance) {
vtx[0] = tx;
}
});
// t1 -> t2 [locked] -> t3 (not available)
Transaction t2 = new Transaction(unitTestParams);
t2.setLockTime(999999);
// Add a fake input to t3 that goes nowhere.
Sha256Hash t3 = Sha256Hash.create("abc".getBytes(Charset.forName("UTF-8")));
t2.addInput(
new TransactionInput(
unitTestParams, t2, new byte[] {}, new TransactionOutPoint(unitTestParams, 0, t3)));
t2.getInput(0).setSequenceNumber(0xDEADBEEF);
t2.addOutput(Utils.toNanoCoins(1, 0), new ECKey());
Transaction t1 = new Transaction(unitTestParams);
t1.addInput(t2.getOutput(0));
t1.addOutput(Utils.toNanoCoins(1, 0), key); // Make it relevant.
// Announce t1.
InventoryMessage inv = new InventoryMessage(unitTestParams);
inv.addTransaction(t1);
inbound(writeTarget, inv);
// Send it.
GetDataMessage getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(t1.getHash(), getdata.getItems().get(0).hash);
inbound(writeTarget, t1);
// Nothing arrived at our event listener yet.
assertNull(vtx[0]);
// We request t2.
getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(t2.getHash(), getdata.getItems().get(0).hash);
inbound(writeTarget, t2);
if (!useNotFound) bouncePing();
// We request t3.
getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(t3, getdata.getItems().get(0).hash);
// Can't find it: bottom of tree.
if (useNotFound) {
NotFoundMessage notFound = new NotFoundMessage(unitTestParams);
notFound.addItem(new InventoryItem(InventoryItem.Type.Transaction, t3));
inbound(writeTarget, notFound);
} else {
bouncePing();
}
pingAndWait(writeTarget);
Threading.waitForUserCode();
// We're done but still not notified because it was timelocked.
if (shouldAccept) assertNotNull(vtx[0]);
else assertNull(vtx[0]);
}
private void bouncePing() throws Exception {
Ping ping = (Ping) outbound(writeTarget);
inbound(writeTarget, new Pong(ping.getNonce()));
}
public void recursiveDownload(boolean useNotFound) throws Exception {
// Using ping or notfound?
connectWithVersion(useNotFound ? 70001 : 60001);
// Check that we can download all dependencies of an unconfirmed relevant transaction from the
// mempool.
ECKey to = new ECKey();
final Transaction[] onTx = new Transaction[1];
peer.addEventListener(
new AbstractPeerEventListener() {
@Override
public void onTransaction(Peer peer1, Transaction t) {
onTx[0] = t;
}
},
Threading.SAME_THREAD);
// Make the some fake transactions in the following graph:
// t1 -> t2 -> [t5]
// -> t3 -> t4 -> [t6]
// -> [t7]
// -> [t8]
// The ones in brackets are assumed to be in the chain and are represented only by hashes.
Transaction t2 = TestUtils.createFakeTx(unitTestParams, Utils.toNanoCoins(1, 0), to);
Sha256Hash t5 = t2.getInput(0).getOutpoint().getHash();
Transaction t4 = TestUtils.createFakeTx(unitTestParams, Utils.toNanoCoins(1, 0), new ECKey());
Sha256Hash t6 = t4.getInput(0).getOutpoint().getHash();
t4.addOutput(Utils.toNanoCoins(1, 0), new ECKey());
Transaction t3 = new Transaction(unitTestParams);
t3.addInput(t4.getOutput(0));
t3.addOutput(Utils.toNanoCoins(1, 0), new ECKey());
Transaction t1 = new Transaction(unitTestParams);
t1.addInput(t2.getOutput(0));
t1.addInput(t3.getOutput(0));
Sha256Hash someHash =
new Sha256Hash("2b801dd82f01d17bbde881687bf72bc62e2faa8ab8133d36fcb8c3abe7459da6");
t1.addInput(
new TransactionInput(
unitTestParams,
t1,
new byte[] {},
new TransactionOutPoint(unitTestParams, 0, someHash)));
Sha256Hash anotherHash =
new Sha256Hash("3b801dd82f01d17bbde881687bf72bc62e2faa8ab8133d36fcb8c3abe7459da6");
t1.addInput(
new TransactionInput(
unitTestParams,
t1,
new byte[] {},
new TransactionOutPoint(unitTestParams, 1, anotherHash)));
t1.addOutput(Utils.toNanoCoins(1, 0), to);
t1 = TestUtils.roundTripTransaction(unitTestParams, t1);
t2 = TestUtils.roundTripTransaction(unitTestParams, t2);
t3 = TestUtils.roundTripTransaction(unitTestParams, t3);
t4 = TestUtils.roundTripTransaction(unitTestParams, t4);
// Announce the first one. Wait for it to be downloaded.
InventoryMessage inv = new InventoryMessage(unitTestParams);
inv.addTransaction(t1);
inbound(writeTarget, inv);
GetDataMessage getdata = (GetDataMessage) outbound(writeTarget);
Threading.waitForUserCode();
assertEquals(t1.getHash(), getdata.getItems().get(0).hash);
inbound(writeTarget, t1);
pingAndWait(writeTarget);
assertEquals(t1, onTx[0]);
// We want its dependencies so ask for them.
ListenableFuture<List<Transaction>> futures = peer.downloadDependencies(t1);
assertFalse(futures.isDone());
// It will recursively ask for the dependencies of t1: t2, t3, someHash and anotherHash.
getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(4, getdata.getItems().size());
assertEquals(t2.getHash(), getdata.getItems().get(0).hash);
assertEquals(t3.getHash(), getdata.getItems().get(1).hash);
assertEquals(someHash, getdata.getItems().get(2).hash);
assertEquals(anotherHash, getdata.getItems().get(3).hash);
long nonce = -1;
if (!useNotFound) nonce = ((Ping) outbound(writeTarget)).getNonce();
// For some random reason, t4 is delivered at this point before it's needed - perhaps it was a
// Bloom filter
// false positive. We do this to check that the mempool is being checked for seen transactions
// before
// requesting them.
inbound(writeTarget, t4);
// Deliver the requested transactions.
inbound(writeTarget, t2);
inbound(writeTarget, t3);
if (useNotFound) {
NotFoundMessage notFound = new NotFoundMessage(unitTestParams);
notFound.addItem(new InventoryItem(InventoryItem.Type.Transaction, someHash));
notFound.addItem(new InventoryItem(InventoryItem.Type.Transaction, anotherHash));
inbound(writeTarget, notFound);
} else {
inbound(writeTarget, new Pong(nonce));
}
assertFalse(futures.isDone());
// It will recursively ask for the dependencies of t2: t5 and t4, but not t3 because it already
// found t4.
getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(getdata.getItems().get(0).hash, t2.getInput(0).getOutpoint().getHash());
// t5 isn't found and t4 is.
if (useNotFound) {
NotFoundMessage notFound = new NotFoundMessage(unitTestParams);
notFound.addItem(new InventoryItem(InventoryItem.Type.Transaction, t5));
inbound(writeTarget, notFound);
} else {
bouncePing();
}
assertFalse(futures.isDone());
// Continue to explore the t4 branch and ask for t6, which is in the chain.
getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(t6, getdata.getItems().get(0).hash);
if (useNotFound) {
NotFoundMessage notFound = new NotFoundMessage(unitTestParams);
notFound.addItem(new InventoryItem(InventoryItem.Type.Transaction, t6));
inbound(writeTarget, notFound);
} else {
bouncePing();
}
pingAndWait(writeTarget);
// That's it, we explored the entire tree.
assertTrue(futures.isDone());
List<Transaction> results = futures.get();
assertTrue(results.contains(t2));
assertTrue(results.contains(t3));
assertTrue(results.contains(t4));
}
@Test
public void chainDownloadEnd2End() throws Exception {
// A full end-to-end test of the chain download process, with a new block being solved in the
// middle.
Block b1 = createFakeBlock(blockStore).block;
blockChain.add(b1);
Block b2 = makeSolvedTestBlock(b1);
Block b3 = makeSolvedTestBlock(b2);
Block b4 = makeSolvedTestBlock(b3);
Block b5 = makeSolvedTestBlock(b4);
connect();
peer.startBlockChainDownload();
GetBlocksMessage getblocks = (GetBlocksMessage) outbound(writeTarget);
assertEquals(blockStore.getChainHead().getHeader().getHash(), getblocks.getLocator().get(0));
assertEquals(Sha256Hash.ZERO_HASH, getblocks.getStopHash());
// Remote peer sends us an inv with some blocks.
InventoryMessage inv = new InventoryMessage(unitTestParams);
inv.addBlock(b2);
inv.addBlock(b3);
// We do a getdata on them.
inbound(writeTarget, inv);
GetDataMessage getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(b2.getHash(), getdata.getItems().get(0).hash);
assertEquals(b3.getHash(), getdata.getItems().get(1).hash);
assertEquals(2, getdata.getItems().size());
// Remote peer sends us the blocks. The act of doing a getdata for b3 results in getting an inv
// with just the
// best chain head in it.
inbound(writeTarget, b2);
inbound(writeTarget, b3);
inv = new InventoryMessage(unitTestParams);
inv.addBlock(b5);
// We request the head block.
inbound(writeTarget, inv);
getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(b5.getHash(), getdata.getItems().get(0).hash);
assertEquals(1, getdata.getItems().size());
// Peer sends us the head block. The act of receiving the orphan block triggers a getblocks to
// fill in the
// rest of the chain.
inbound(writeTarget, b5);
getblocks = (GetBlocksMessage) outbound(writeTarget);
assertEquals(b5.getHash(), getblocks.getStopHash());
assertEquals(b3.getHash(), getblocks.getLocator().get(0));
// At this point another block is solved and broadcast. The inv triggers a getdata but we do NOT
// send another
// getblocks afterwards, because that would result in us receiving the same set of blocks twice
// which is a
// timewaste. The getblocks message that would have been generated is set to be the same as the
// previous
// because we walk backwards down the orphan chain and then discover we already asked for those
// blocks, so
// nothing is done.
Block b6 = makeSolvedTestBlock(b5);
inv = new InventoryMessage(unitTestParams);
inv.addBlock(b6);
inbound(writeTarget, inv);
getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(1, getdata.getItems().size());
assertEquals(b6.getHash(), getdata.getItems().get(0).hash);
inbound(writeTarget, b6);
assertNull(outbound(writeTarget)); // Nothing is sent at this point.
// We're still waiting for the response to the getblocks (b3,b5) sent above.
inv = new InventoryMessage(unitTestParams);
inv.addBlock(b4);
inv.addBlock(b5);
inbound(writeTarget, inv);
getdata = (GetDataMessage) outbound(writeTarget);
assertEquals(1, getdata.getItems().size());
assertEquals(b4.getHash(), getdata.getItems().get(0).hash);
// We already have b5 from before, so it's not requested again.
inbound(writeTarget, b4);
assertNull(outbound(writeTarget));
// b5 and b6 are now connected by the block chain and we're done.
assertNull(outbound(writeTarget));
closePeer(peer);
}