/**
* Determine whether a transaction was sent from one of our own addresses.
*
* <p>This is a costly operation as we first have to lookup the transaction and then it's funding
* outputs
*
* @param txid the ID of the transaction to investigate
* @return true if one of the funding outputs were sent from one of our own addresses
*/
protected boolean isFromMe(Sha256Hash txid) {
Transaction t = TransactionEx.toTransaction(_backing.getTransaction(txid));
if (t == null) {
return false;
}
return isFromMe(t);
}
@Override
public synchronized boolean deleteTransaction(Sha256Hash transactionId) {
TransactionEx tex = _backing.getTransaction(transactionId);
if (tex == null) return false;
Transaction tx = TransactionEx.toTransaction(tex);
_backing.beginTransaction();
try {
// See if any of the outputs are stored locally and remove them
for (int i = 0; i < tx.outputs.length; i++) {
TransactionOutput output = tx.outputs[i];
OutPoint outPoint = new OutPoint(tx.getHash(), i);
TransactionOutputEx utxo = _backing.getUnspentOutput(outPoint);
if (utxo != null) {
_backing.deleteUnspentOutput(outPoint);
}
}
// remove it from the backing
_backing.deleteTransaction(transactionId);
_backing.setTransactionSuccessful();
} finally {
_backing.endTransaction();
}
updateLocalBalance(); // will still need a new sync besides re-calculating
return true;
}
@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 boolean monitorYoungTransactions() {
Collection<TransactionEx> list = _backing.getYoungTransactions(5, getBlockChainHeight());
if (list.isEmpty()) {
return true;
}
List<Sha256Hash> txids = new ArrayList<Sha256Hash>(list.size());
for (TransactionEx tex : list) {
txids.add(tex.txid);
}
CheckTransactionsResponse result;
try {
result = _wapi.checkTransactions(new CheckTransactionsRequest(txids)).getResult();
} catch (WapiException e) {
postEvent(Event.SERVER_CONNECTION_ERROR);
_logger.logError("Server connection failed with error code: " + e.errorCode, e);
// We failed to check transactions
return false;
}
for (TransactionStatus t : result.transactions) {
if (!t.found) {
// We have a transaction locally that does not exist in the
// blockchain. Must be a residue due to double-spend or malleability
_backing.deleteTransaction(t.txid);
continue;
}
TransactionEx tex = _backing.getTransaction(t.txid);
Preconditions.checkNotNull(tex);
if (tex.height != t.height || tex.time != t.time) {
// The transaction got a new height or timestamp. There could be
// several reasons for that. It got a new timestamp from the server,
// it confirmed, or might also be a reorg.
TransactionEx newTex = new TransactionEx(tex.txid, t.height, t.time, tex.binary);
System.out.println("Replacing:\n" + tex.toString() + "\nWith:\n" + newTex.toString());
postEvent(Event.TRANSACTION_HISTORY_CHANGED);
_backing.deleteTransaction(tex.txid);
_backing.putTransaction(newTex);
}
}
return true;
}
@Override
public TransactionEx getTransaction(Sha256Hash txid) {
return _backing.getTransaction(txid);
}
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);
}
}
@Override
public TransactionSummary getTransactionSummary(Sha256Hash txid) {
TransactionEx tx = _backing.getTransaction(txid);
return transform(tx, tx.height);
}