protected boolean synchronizeUnspentOutputs(Collection<Address> addresses) {
// Get the current unspent outputs as dictated by the block chain
QueryUnspentOutputsResponse UnspentOutputResponse;
try {
UnspentOutputResponse =
_wapi
.queryUnspentOutputs(new QueryUnspentOutputsRequest(Wapi.VERSION, addresses))
.getResult();
} catch (WapiException e) {
_logger.logError("Server connection failed with error code: " + e.errorCode, e);
postEvent(Event.SERVER_CONNECTION_ERROR);
return false;
}
Collection<TransactionOutputEx> remoteUnspent = UnspentOutputResponse.unspent;
// Store the current block height
setBlockChainHeight(UnspentOutputResponse.height);
// Make a map for fast lookup
Map<OutPoint, TransactionOutputEx> remoteMap = toMap(remoteUnspent);
// Get the current unspent outputs as it is believed to be locally
Collection<TransactionOutputEx> localUnspent = _backing.getAllUnspentOutputs();
// Make a map for fast lookup
Map<OutPoint, TransactionOutputEx> localMap = toMap(localUnspent);
// Find remotely removed unspent outputs
for (TransactionOutputEx l : localUnspent) {
TransactionOutputEx r = remoteMap.get(l.outPoint);
if (r == null) {
// An output has gone. Maybe it was spent in another wallet, or
// never confirmed due to missing fees, double spend, or mutated.
// Either way, we delete it locally
_backing.deleteUnspentOutput(l.outPoint);
}
}
// Find remotely added unspent outputs
Set<Sha256Hash> transactionsToAddOrUpdate = new HashSet<Sha256Hash>();
List<TransactionOutputEx> unspentOutputsToAddOrUpdate = new LinkedList<TransactionOutputEx>();
for (TransactionOutputEx r : remoteUnspent) {
TransactionOutputEx l = localMap.get(r.outPoint);
if (l == null || l.height != r.height) {
// New remote output or new height (Maybe it confirmed or we
// might even have had a reorg). Either way we just update it
unspentOutputsToAddOrUpdate.add(r);
transactionsToAddOrUpdate.add(r.outPoint.hash);
// Note: We are not adding the unspent output to the DB just yet. We
// first want to verify the full set of funding transactions of the
// transaction that this unspent output belongs to
}
}
// Fetch updated or added transactions
if (transactionsToAddOrUpdate.size() > 0) {
GetTransactionsResponse response;
try {
response =
_wapi
.getTransactions(
new GetTransactionsRequest(Wapi.VERSION, transactionsToAddOrUpdate))
.getResult();
} catch (WapiException e) {
_logger.logError("Server connection failed with error code: " + e.errorCode, e);
postEvent(Event.SERVER_CONNECTION_ERROR);
return false;
}
try {
handleNewExternalTransactions(response.transactions);
} catch (WapiException e) {
_logger.logError("Server connection failed with error code: " + e.errorCode, e);
postEvent(Event.SERVER_CONNECTION_ERROR);
return false;
}
// Finally update out list of unspent outputs with added or updated
// outputs
for (TransactionOutputEx output : unspentOutputsToAddOrUpdate) {
_backing.putUnspentOutput(output);
}
}
return true;
}
