Esempio n. 1
1
  protected Collection<TransactionOutputEx> getSpendableOutputs() {
    Collection<TransactionOutputEx> list = _backing.getAllUnspentOutputs();

    // Prune confirmed outputs for coinbase outputs that are not old enough
    // for spending. Also prune unconfirmed receiving coins except for change
    int blockChainHeight = getBlockChainHeight();
    Iterator<TransactionOutputEx> it = list.iterator();
    while (it.hasNext()) {
      TransactionOutputEx output = it.next();
      if (output.isCoinBase) {
        int confirmations = blockChainHeight - output.height;
        if (confirmations < COINBASE_MIN_CONFIRMATIONS) {
          it.remove();
          continue;
        }
      }
      // Unless we allow zero confirmation spending we prune all unconfirmed outputs sent from
      // foreign addresses
      if (!_allowZeroConfSpending) {
        if (output.height == -1 && !isFromMe(output.outPoint.hash)) {
          // Prune receiving coins that is not change sent to ourselves
          it.remove();
        }
      }
    }
    return list;
  }
Esempio n. 2
0
  private void handleNewExternalTransactionsInt(Collection<TransactionEx> transactions)
      throws WapiException {
    // Transform and put into two arrays with matching indexes
    ArrayList<TransactionEx> texArray = new ArrayList<TransactionEx>(transactions.size());
    ArrayList<Transaction> txArray = new ArrayList<Transaction>(transactions.size());
    for (TransactionEx tex : transactions) {
      try {
        txArray.add(Transaction.fromByteReader(new ByteReader(tex.binary)));
        texArray.add(tex);
      } catch (TransactionParsingException e) {
        // We hit a transaction that we cannot parse. Log but otherwise ignore it
        _logger.logError("Received transaction that we cannot parse: " + tex.txid.toString());
        continue;
      }
    }

    // Grab and handle parent transactions
    fetchStoreAndValidateParentOutputs(txArray);

    // Store transaction locally
    for (int i = 0; i < txArray.size(); i++) {
      _backing.putTransaction(texArray.get(i));
      onNewTransaction(texArray.get(i), txArray.get(i));
    }
  }
Esempio n. 3
0
  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;
  }
Esempio n. 4
0
 protected void handleNewExternalTransactions(Collection<TransactionEx> transactions)
     throws WapiException {
   if (transactions.size() <= MAX_TRANSACTIONS_TO_HANDLE_SIMULTANEOUSLY) {
     handleNewExternalTransactionsInt(transactions);
   } else {
     // We have quite a list of transactions to handle, do it in batches
     ArrayList<TransactionEx> all = new ArrayList<TransactionEx>(transactions);
     for (int i = 0; i < all.size(); i += MAX_TRANSACTIONS_TO_HANDLE_SIMULTANEOUSLY) {
       int endIndex = Math.min(all.size(), i + MAX_TRANSACTIONS_TO_HANDLE_SIMULTANEOUSLY);
       List<TransactionEx> sub = all.subList(i, endIndex);
       handleNewExternalTransactionsInt(sub);
     }
   }
 }
Esempio n. 5
0
  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);
    }
  }