@Override
public TransactionDetails getTransactionDetails(Sha256Hash txid) {
// Note that this method is not synchronized, and we might fetch the transaction history while
// synchronizing
// accounts. That should be ok as we write to the DB in a sane order.
TransactionEx tex = _backing.getTransaction(txid);
Transaction tx = TransactionEx.toTransaction(tex);
if (tx == null) {
throw new RuntimeException();
}
List<TransactionDetails.Item> inputs = new ArrayList<TransactionDetails.Item>(tx.inputs.length);
if (tx.isCoinbase()) {
// We have a coinbase transaction. Create one input with the sum of the outputs as its value,
// and make the address the null address
long value = 0;
for (TransactionOutput out : tx.outputs) {
value += out.value;
}
inputs.add(new TransactionDetails.Item(Address.getNullAddress(_network), value, true));
} else {
// Populate the inputs
for (TransactionInput input : tx.inputs) {
Sha256Hash parentHash = input.outPoint.hash;
// Get the parent transaction
TransactionOutputEx parentOutput = _backing.getParentTransactionOutput(input.outPoint);
if (parentOutput == null) {
// We never heard about the parent, skip
continue;
}
// Determine the parent address
Address parentAddress;
ScriptOutput parentScript = ScriptOutput.fromScriptBytes(parentOutput.script);
if (parentScript == null) {
// Null address means we couldn't figure out the address, strange script
parentAddress = Address.getNullAddress(_network);
} else {
parentAddress = parentScript.getAddress(_network);
}
inputs.add(new TransactionDetails.Item(parentAddress, parentOutput.value, false));
}
}
// Populate the outputs
TransactionDetails.Item[] outputs = new TransactionDetails.Item[tx.outputs.length];
for (int i = 0; i < tx.outputs.length; i++) {
Address address = tx.outputs[i].script.getAddress(_network);
outputs[i] = new TransactionDetails.Item(address, tx.outputs[i].value, false);
}
return new TransactionDetails(
txid, tex.height, tex.time, inputs.toArray(new TransactionDetails.Item[] {}), outputs);
}
protected TransactionSummary transform(
Transaction tx, int time, int height, int blockChainHeight) {
long value = 0;
Address destAddress = null;
for (TransactionOutput output : tx.outputs) {
if (isMine(output.script)) {
value += output.value;
} else {
destAddress = output.script.getAddress(_network);
}
}
if (tx.isCoinbase()) {
// For coinbase transactions there is nothing to subtract
} else {
for (TransactionInput input : tx.inputs) {
// find parent output
TransactionOutputEx funding = _backing.getParentTransactionOutput(input.outPoint);
if (funding == null) {
_logger.logError("Unable to find parent output for: " + input.outPoint);
continue;
}
if (isMine(funding)) {
value -= funding.value;
}
}
}
int confirmations;
if (height == -1) {
confirmations = 0;
} else {
confirmations = Math.max(0, blockChainHeight - height + 1);
}
// only track a destinationAddress if it is an outgoing transaction (i.e. send money to someone)
// to prevent the user that he tries to return money to an address he got bitcoin from.
if (value >= 0) {
destAddress = null;
}
boolean isQueuedOutgoing = _backing.isOutgoingTransaction(tx.getHash());
return new TransactionSummary(
tx.getHash(),
value,
time,
height,
confirmations,
isQueuedOutgoing,
com.google.common.base.Optional.fromNullable(destAddress));
}
/**
* Determine whether a transaction was sent from one of our own addresses.
*
* <p>This is a costly operation as we have to lookup funding outputs of the transaction
*
* @param t the transaction to investigate
* @return true iff one of the funding outputs were sent from one of our own addresses
*/
protected boolean isFromMe(Transaction t) {
for (TransactionInput input : t.inputs) {
TransactionOutputEx funding = _backing.getParentTransactionOutput(input.outPoint);
if (funding == null || funding.isCoinBase) {
continue;
}
ScriptOutput fundingScript = ScriptOutput.fromScriptBytes(funding.script);
Address fundingAddress = fundingScript.getAddress(_network);
if (isMine(fundingAddress)) {
return true;
}
}
return false;
}
protected Balance calculateLocalBalance() {
Collection<TransactionOutputEx> unspentOutputs =
new HashSet<TransactionOutputEx>(_backing.getAllUnspentOutputs());
long confirmed = 0;
long pendingChange = 0;
long pendingSending = 0;
long pendingReceiving = 0;
//
// Determine the value we are receiving and create a set of outpoints for fast lookup
//
Set<OutPoint> unspentOutPoints = new HashSet<OutPoint>();
for (TransactionOutputEx output : unspentOutputs) {
if (output.height == -1) {
if (isFromMe(output.outPoint.hash)) {
pendingChange += output.value;
} else {
pendingReceiving += output.value;
}
} else {
confirmed += output.value;
}
unspentOutPoints.add(output.outPoint);
}
//
// Determine the value we are sending
//
// Get the current set of unconfirmed transactions
List<Transaction> unconfirmed = new ArrayList<Transaction>();
for (TransactionEx tex : _backing.getUnconfirmedTransactions()) {
try {
Transaction t = Transaction.fromByteReader(new ByteReader(tex.binary));
unconfirmed.add(t);
} catch (TransactionParsingException e) {
// never happens, we have parsed it before
}
}
for (Transaction t : unconfirmed) {
// For each input figure out if WE are sending it by fetching the
// parent transaction and looking at the address
boolean weSend = false;
for (TransactionInput input : t.inputs) {
// Find the parent transaction
if (input.outPoint.hash.equals(Sha256Hash.ZERO_HASH)) {
continue;
}
TransactionOutputEx parent = _backing.getParentTransactionOutput(input.outPoint);
if (parent == null) {
_logger.logError("Unable to find parent transaction output: " + input.outPoint);
continue;
}
TransactionOutput parentOutput = transform(parent);
Address fundingAddress = parentOutput.script.getAddress(_network);
if (isMine(fundingAddress)) {
// One of our addresses are sending coins
pendingSending += parentOutput.value;
weSend = true;
}
}
// Now look at the outputs and if it contains change for us, then subtract that from the
// sending amount
// if it is already spent in another transaction
for (int i = 0; i < t.outputs.length; i++) {
TransactionOutput output = t.outputs[i];
Address destination = output.script.getAddress(_network);
if (weSend && isMine(destination)) {
// The funds are sent from us to us
OutPoint outPoint = new OutPoint(t.getHash(), i);
if (!unspentOutPoints.contains(outPoint)) {
// This output has been spent, subtract it from the amount sent
pendingSending -= output.value;
}
}
}
}
int blockHeight = getBlockChainHeight();
return new Balance(
confirmed,
pendingReceiving,
pendingSending,
pendingChange,
System.currentTimeMillis(),
blockHeight,
true,
_allowZeroConfSpending);
}
private void fetchStoreAndValidateParentOutputs(ArrayList<Transaction> transactions)
throws WapiException {
Map<Sha256Hash, TransactionEx> parentTransactions = new HashMap<Sha256Hash, TransactionEx>();
Map<OutPoint, TransactionOutputEx> parentOutputs = new HashMap<OutPoint, TransactionOutputEx>();
// Find list of parent outputs to fetch
Collection<Sha256Hash> toFetch = new HashSet<Sha256Hash>();
for (Transaction t : transactions) {
for (TransactionInput in : t.inputs) {
if (in.outPoint.hash.equals(OutPoint.COINBASE_OUTPOINT.hash)) {
// Coinbase input, so no parent
continue;
}
TransactionOutputEx parentOutput = _backing.getParentTransactionOutput(in.outPoint);
if (parentOutput != null) {
// We already have the parent output, no need to fetch the entire
// parent transaction
parentOutputs.put(parentOutput.outPoint, parentOutput);
continue;
}
TransactionEx parentTransaction = _backing.getTransaction(in.outPoint.hash);
if (parentTransaction != null) {
// We had the parent transaction in our own transactions, no need to
// fetch it remotely
parentTransactions.put(parentTransaction.txid, parentTransaction);
} else {
// Need to fetch it
toFetch.add(in.outPoint.hash);
}
}
}
// Fetch missing parent transactions
if (toFetch.size() > 0) {
GetTransactionsResponse result =
_wapi.getTransactions(new GetTransactionsRequest(Wapi.VERSION, toFetch)).getResult();
for (TransactionEx tx : result.transactions) {
// Verify transaction hash. This is important as we don't want to
// have a transaction output associated with an outpoint that
// doesn't match.
// This is the end users protection against a rogue server that lies
// about the value of an output and makes you pay a large fee.
Sha256Hash hash = HashUtils.doubleSha256(tx.binary).reverse();
if (hash.equals(tx.txid)) {
parentTransactions.put(tx.txid, tx);
} else {
_logger.logError(
"Failed to validate transaction hash from server. Expected: "
+ tx.txid
+ " Calculated: "
+ hash);
throw new RuntimeException(
"Failed to validate transaction hash from server. Expected: "
+ tx.txid
+ " Calculated: "
+ hash);
}
}
}
// We should now have all parent transactions or parent outputs. There is
// a slight probability that one of them was not found due to double
// spends and/or malleability and network latency etc.
// Now figure out which parent outputs we need to persist
List<TransactionOutputEx> toPersist = new LinkedList<TransactionOutputEx>();
for (Transaction t : transactions) {
for (TransactionInput in : t.inputs) {
if (in.outPoint.hash.equals(OutPoint.COINBASE_OUTPOINT.hash)) {
// coinbase input, so no parent
continue;
}
TransactionOutputEx parentOutput = parentOutputs.get(in.outPoint);
if (parentOutput != null) {
// We had it all along
continue;
}
TransactionEx parentTex = parentTransactions.get(in.outPoint.hash);
if (parentTex != null) {
// Parent output not found, maybe we already have it
parentOutput = TransactionEx.getTransactionOutput(parentTex, in.outPoint.index);
toPersist.add(parentOutput);
continue;
}
_logger.logError("Parent transaction not found: " + in.outPoint.hash);
}
}
// Persist
for (TransactionOutputEx output : toPersist) {
_backing.putParentTransactionOutput(output);
}
}
