private static void sendTransactionsToListener(
StoredBlock block,
NewBlockType blockType,
BlockChainListener listener,
int relativityOffset,
List<Transaction> transactions,
boolean clone,
Set<Sha256Hash> falsePositives)
throws VerificationException {
for (Transaction tx : transactions) {
try {
if (listener.isTransactionRelevant(tx)) {
falsePositives.remove(tx.getHash());
if (clone) tx = new Transaction(tx.params, tx.bitcoinSerialize());
listener.receiveFromBlock(tx, block, blockType, relativityOffset++);
}
} catch (ScriptException e) {
// We don't want scripts we don't understand to break the block chain so just note that this
// tx was
// not scanned here and continue.
log.warn("Failed to parse a script: " + e.toString());
} catch (ProtocolException e) {
// Failed to duplicate tx, should never happen.
throw new RuntimeException(e);
}
}
}
@VisibleForTesting
synchronized void doStoreChannelInWallet(Sha256Hash id) {
StoredPaymentChannelClientStates channels =
(StoredPaymentChannelClientStates)
wallet.getExtensions().get(StoredPaymentChannelClientStates.EXTENSION_ID);
checkNotNull(
channels,
"You have not added the StoredPaymentChannelClientStates extension to the wallet.");
checkState(channels.getChannel(id, multisigContract.getHash()) == null);
storedChannel =
new StoredClientChannel(id, multisigContract, refundTx, myKey, valueToMe, refundFees, true);
channels.putChannel(storedChannel);
wallet.addOrUpdateExtension(channels);
}
/**
* Stores this channel's state in the wallet as a part of a {@link
* StoredPaymentChannelServerStates} wallet extension and keeps it up-to-date each time payment is
* incremented. This will be automatically removed when a call to {@link
* PaymentChannelServerState#close()} completes successfully. A channel may only be stored after
* it has fully opened (ie state == State.READY).
*
* @param connectedHandler Optional {@link PaymentChannelServer} object that manages this object.
* This will set the appropriate pointer in the newly created {@link StoredServerChannel}
* before it is committed to wallet. If set, closing the state object will propagate the close
* to the handler which can then do a TCP disconnect.
*/
public synchronized void storeChannelInWallet(@Nullable PaymentChannelServer connectedHandler) {
checkState(state == State.READY);
if (storedServerChannel != null) return;
log.info("Storing state with contract hash {}.", multisigContract.getHash());
StoredPaymentChannelServerStates channels =
(StoredPaymentChannelServerStates)
wallet.addOrGetExistingExtension(
new StoredPaymentChannelServerStates(wallet, broadcaster));
storedServerChannel =
new StoredServerChannel(
this,
multisigContract,
clientOutput,
refundTransactionUnlockTimeSecs,
serverKey,
bestValueToMe,
bestValueSignature);
if (connectedHandler != null)
checkState(
storedServerChannel.setConnectedHandler(connectedHandler, false) == connectedHandler);
channels.putChannel(storedServerChannel);
}
/**
* Called when the client provides us with a new signature and wishes to increment total payment
* by size. Verifies the provided signature and only updates values if everything checks out. If
* the new refundSize is not the lowest we have seen, it is simply ignored.
*
* @param refundSize How many satoshis of the original contract are refunded to the client (the
* rest are ours)
* @param signatureBytes The new signature spending the multi-sig contract to a new payment
* transaction
* @throws VerificationException If the signature does not verify or size is out of range (incl
* being rejected by the network as dust).
* @return true if there is more value left on the channel, false if it is now fully used up.
*/
public synchronized boolean incrementPayment(Coin refundSize, byte[] signatureBytes)
throws VerificationException, ValueOutOfRangeException, InsufficientMoneyException {
checkState(state == State.READY);
checkNotNull(refundSize);
checkNotNull(signatureBytes);
TransactionSignature signature = TransactionSignature.decodeFromBitcoin(signatureBytes, true);
// We allow snapping to zero for the payment amount because it's treated specially later, but
// not less than
// the dust level because that would prevent the transaction from being relayed/mined.
final boolean fullyUsedUp = refundSize.equals(Coin.ZERO);
if (refundSize.compareTo(clientOutput.getMinNonDustValue()) < 0 && !fullyUsedUp)
throw new ValueOutOfRangeException(
"Attempt to refund negative value or value too small to be accepted by the network");
Coin newValueToMe = totalValue.subtract(refundSize);
if (newValueToMe.signum() < 0)
throw new ValueOutOfRangeException("Attempt to refund more than the contract allows.");
if (newValueToMe.compareTo(bestValueToMe) < 0)
throw new ValueOutOfRangeException("Attempt to roll back payment on the channel.");
// Get the wallet's copy of the multisigContract (ie with confidence information), if this is
// null, the wallet
// was not connected to the peergroup when the contract was broadcast (which may cause issues
// down the road, and
// disables our double-spend check next)
Transaction walletContract = wallet.getTransaction(multisigContract.getHash());
checkNotNull(
walletContract,
"Wallet did not contain multisig contract {} after state was marked READY",
multisigContract.getHash());
// Note that we check for DEAD state here, but this test is essentially useless in production
// because we will
// miss most double-spends due to bloom filtering right now anyway. This will eventually fixed
// by network-wide
// double-spend notifications, so we just wait instead of attempting to add all dependant
// outpoints to our bloom
// filters (and probably missing lots of edge-cases).
if (walletContract.getConfidence().getConfidenceType()
== TransactionConfidence.ConfidenceType.DEAD) {
close();
throw new VerificationException("Multisig contract was double-spent");
}
Transaction.SigHash mode;
// If the client doesn't want anything back, they shouldn't sign any outputs at all.
if (fullyUsedUp) mode = Transaction.SigHash.NONE;
else mode = Transaction.SigHash.SINGLE;
if (signature.sigHashMode() != mode || !signature.anyoneCanPay())
throw new VerificationException(
"New payment signature was not signed with the right SIGHASH flags.");
Wallet.SendRequest req = makeUnsignedChannelContract(newValueToMe);
// Now check the signature is correct.
// Note that the client must sign with SIGHASH_{SINGLE/NONE} | SIGHASH_ANYONECANPAY to allow us
// to add additional
// inputs (in case we need to add significant fee, or something...) and any outputs we want to
// pay to.
Sha256Hash sighash = req.tx.hashForSignature(0, multisigScript, mode, true);
if (!clientKey.verify(sighash, signature))
throw new VerificationException("Signature does not verify on tx\n" + req.tx);
bestValueToMe = newValueToMe;
bestValueSignature = signatureBytes;
updateChannelInWallet();
return !fullyUsedUp;
}