Exemplo n.º 1
0
  @Override
  /** Used during reorgs to connect a block previously on a fork */
  protected synchronized TransactionOutputChanges connectTransactions(StoredBlock newBlock)
      throws VerificationException, BlockStoreException, PrunedException {
    checkState(lock.isHeldByCurrentThread());
    if (!params.passesCheckpoint(newBlock.getHeight(), newBlock.getHeader().getHash()))
      throw new VerificationException("Block failed checkpoint lockin at " + newBlock.getHeight());

    blockStore.beginDatabaseBatchWrite();
    StoredUndoableBlock block = blockStore.getUndoBlock(newBlock.getHeader().getHash());
    if (block == null) {
      // We're trying to re-org too deep and the data needed has been deleted.
      blockStore.abortDatabaseBatchWrite();
      throw new PrunedException(newBlock.getHeader().getHash());
    }
    TransactionOutputChanges txOutChanges;
    try {
      List<Transaction> transactions = block.getTransactions();
      if (transactions != null) {
        LinkedList<StoredTransactionOutput> txOutsSpent = new LinkedList<StoredTransactionOutput>();
        LinkedList<StoredTransactionOutput> txOutsCreated =
            new LinkedList<StoredTransactionOutput>();
        long sigOps = 0;
        final Set<VerifyFlag> verifyFlags = EnumSet.noneOf(VerifyFlag.class);
        if (newBlock.getHeader().getTimeSeconds() >= NetworkParameters.BIP16_ENFORCE_TIME)
          verifyFlags.add(VerifyFlag.P2SH);
        if (!params.isCheckpoint(newBlock.getHeight())) {
          for (Transaction tx : transactions) {
            Sha256Hash hash = tx.getHash();
            if (blockStore.hasUnspentOutputs(hash, tx.getOutputs().size()))
              throw new VerificationException("Block failed BIP30 test!");
          }
        }

        if (scriptVerificationExecutor.isShutdown())
          scriptVerificationExecutor =
              Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
        List<Future<VerificationException>> listScriptVerificationResults =
            new ArrayList<Future<VerificationException>>(transactions.size());
        for (final Transaction tx : transactions) {
          boolean isCoinBase = tx.isCoinBase();
          Coin valueIn = Coin.ZERO;
          Coin valueOut = Coin.ZERO;
          final List<Script> prevOutScripts = new LinkedList<Script>();
          if (!isCoinBase) {
            for (int index = 0; index < tx.getInputs().size(); index++) {
              final TransactionInput in = tx.getInputs().get(index);
              final StoredTransactionOutput prevOut =
                  blockStore.getTransactionOutput(
                      in.getOutpoint().getHash(), in.getOutpoint().getIndex());
              if (prevOut == null)
                throw new VerificationException(
                    "Attempted spend of a non-existent or already spent output!");
              if (newBlock.getHeight() - prevOut.getHeight() < params.getSpendableCoinbaseDepth())
                throw new VerificationException(
                    "Tried to spend coinbase at depth "
                        + (newBlock.getHeight() - prevOut.getHeight()));
              valueIn = valueIn.add(prevOut.getValue());
              if (verifyFlags.contains(VerifyFlag.P2SH)) {
                Script script = new Script(prevOut.getScriptBytes());
                if (script.isPayToScriptHash())
                  sigOps += Script.getP2SHSigOpCount(in.getScriptBytes());
                if (sigOps > Block.MAX_BLOCK_SIGOPS)
                  throw new VerificationException("Too many P2SH SigOps in block");
              }

              prevOutScripts.add(new Script(prevOut.getScriptBytes()));

              blockStore.removeUnspentTransactionOutput(prevOut);
              txOutsSpent.add(prevOut);
            }
          }
          Sha256Hash hash = tx.getHash();
          for (TransactionOutput out : tx.getOutputs()) {
            valueOut = valueOut.add(out.getValue());
            StoredTransactionOutput newOut =
                new StoredTransactionOutput(
                    hash,
                    out.getIndex(),
                    out.getValue(),
                    newBlock.getHeight(),
                    isCoinBase,
                    out.getScriptBytes());
            blockStore.addUnspentTransactionOutput(newOut);
            txOutsCreated.add(newOut);
          }
          // All values were already checked for being non-negative (as it is verified in
          // Transaction.verify())
          // but we check again here just for defence in depth. Transactions with zero output value
          // are OK.
          if (valueOut.signum() < 0 || valueOut.compareTo(NetworkParameters.MAX_MONEY) > 0)
            throw new VerificationException("Transaction output value out of range");

          if (!isCoinBase) {
            // Because correctlySpends modifies transactions, this must come after we are done with
            // tx
            FutureTask<VerificationException> future =
                new FutureTask<VerificationException>(
                    new Verifier(tx, prevOutScripts, verifyFlags));
            scriptVerificationExecutor.execute(future);
            listScriptVerificationResults.add(future);
          }
        }
        txOutChanges = new TransactionOutputChanges(txOutsCreated, txOutsSpent);
        for (Future<VerificationException> future : listScriptVerificationResults) {
          VerificationException e;
          try {
            e = future.get();
          } catch (InterruptedException thrownE) {
            throw new RuntimeException(thrownE); // Shouldn't happen
          } catch (ExecutionException thrownE) {
            log.error("Script.correctlySpends threw a non-normal exception: " + thrownE.getCause());
            throw new VerificationException(
                "Bug in Script.correctlySpends, likely script malformed in some new and interesting way.",
                thrownE);
          }
          if (e != null) throw e;
        }
      } else {
        txOutChanges = block.getTxOutChanges();
        if (!params.isCheckpoint(newBlock.getHeight()))
          for (StoredTransactionOutput out : txOutChanges.txOutsCreated) {
            Sha256Hash hash = out.getHash();
            if (blockStore.getTransactionOutput(hash, out.getIndex()) != null)
              throw new VerificationException("Block failed BIP30 test!");
          }
        for (StoredTransactionOutput out : txOutChanges.txOutsCreated)
          blockStore.addUnspentTransactionOutput(out);
        for (StoredTransactionOutput out : txOutChanges.txOutsSpent)
          blockStore.removeUnspentTransactionOutput(out);
      }
    } catch (VerificationException e) {
      scriptVerificationExecutor.shutdownNow();
      blockStore.abortDatabaseBatchWrite();
      throw e;
    } catch (BlockStoreException e) {
      scriptVerificationExecutor.shutdownNow();
      blockStore.abortDatabaseBatchWrite();
      throw e;
    }
    return txOutChanges;
  }
Exemplo n.º 2
0
  @Override
  protected TransactionOutputChanges connectTransactions(int height, Block block)
      throws VerificationException, BlockStoreException {
    checkState(lock.isHeldByCurrentThread());
    if (block.transactions == null)
      throw new RuntimeException(
          "connectTransactions called with Block that didn't have transactions!");
    if (!params.passesCheckpoint(height, block.getHash()))
      throw new VerificationException("Block failed checkpoint lockin at " + height);

    blockStore.beginDatabaseBatchWrite();

    LinkedList<StoredTransactionOutput> txOutsSpent = new LinkedList<StoredTransactionOutput>();
    LinkedList<StoredTransactionOutput> txOutsCreated = new LinkedList<StoredTransactionOutput>();
    long sigOps = 0;
    final Set<VerifyFlag> verifyFlags = EnumSet.noneOf(VerifyFlag.class);
    if (block.getTimeSeconds() >= NetworkParameters.BIP16_ENFORCE_TIME)
      verifyFlags.add(VerifyFlag.P2SH);

    if (scriptVerificationExecutor.isShutdown())
      scriptVerificationExecutor =
          Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    List<Future<VerificationException>> listScriptVerificationResults =
        new ArrayList<Future<VerificationException>>(block.transactions.size());
    try {
      if (!params.isCheckpoint(height)) {
        // BIP30 violator blocks are ones that contain a duplicated transaction. They are all in the
        // checkpoints list and we therefore only check non-checkpoints for duplicated transactions
        // here. See the
        // BIP30 document for more details on this:
        // https://github.com.matthewmitchell/bips/blob/master/bip-0030.mediawiki
        for (Transaction tx : block.transactions) {
          Sha256Hash hash = tx.getHash();
          // If we already have unspent outputs for this hash, we saw the tx already. Either the
          // block is
          // being added twice (bug) or the block is a BIP30 violator.
          if (blockStore.hasUnspentOutputs(hash, tx.getOutputs().size()))
            throw new VerificationException("Block failed BIP30 test!");
          if (verifyFlags.contains(
              VerifyFlag
                  .P2SH)) // We already check non-BIP16 sigops in Block.verifyTransactions(true)
          sigOps += tx.getSigOpCount();
        }
      }
      for (final Transaction tx : block.transactions) {
        boolean isCoinBase = tx.isCoinBase();
        Coin valueIn = Coin.ZERO;
        Coin valueOut = Coin.ZERO;
        final List<Script> prevOutScripts = new LinkedList<Script>();
        if (!isCoinBase) {
          // For each input of the transaction remove the corresponding output from the set of
          // unspent
          // outputs.
          for (int index = 0; index < tx.getInputs().size(); index++) {
            TransactionInput in = tx.getInputs().get(index);
            StoredTransactionOutput prevOut =
                blockStore.getTransactionOutput(
                    in.getOutpoint().getHash(), in.getOutpoint().getIndex());
            if (prevOut == null)
              throw new VerificationException(
                  "Attempted to spend a non-existent or already spent output!");
            // Coinbases can't be spent until they mature, to avoid re-orgs destroying entire
            // transaction
            // chains. The assumption is there will ~never be re-orgs deeper than the spendable
            // coinbase
            // chain depth.
            if (height - prevOut.getHeight() < params.getSpendableCoinbaseDepth())
              throw new VerificationException(
                  "Tried to spend coinbase at depth " + (height - prevOut.getHeight()));
            // TODO: Check we're not spending the genesis transaction here. Satoshis code won't
            // allow it.
            valueIn = valueIn.add(prevOut.getValue());
            if (verifyFlags.contains(VerifyFlag.P2SH)) {
              if (new Script(prevOut.getScriptBytes()).isPayToScriptHash())
                sigOps += Script.getP2SHSigOpCount(in.getScriptBytes());
              if (sigOps > Block.MAX_BLOCK_SIGOPS)
                throw new VerificationException("Too many P2SH SigOps in block");
            }

            prevOutScripts.add(new Script(prevOut.getScriptBytes()));

            // in.getScriptSig().correctlySpends(tx, index, new Script(params,
            // prevOut.getScriptBytes(), 0, prevOut.getScriptBytes().length));

            blockStore.removeUnspentTransactionOutput(prevOut);
            txOutsSpent.add(prevOut);
          }
        }
        Sha256Hash hash = tx.getHash();
        for (TransactionOutput out : tx.getOutputs()) {
          valueOut = valueOut.add(out.getValue());
          // For each output, add it to the set of unspent outputs so it can be consumed in future.
          StoredTransactionOutput newOut =
              new StoredTransactionOutput(
                  hash, out.getIndex(), out.getValue(), height, isCoinBase, out.getScriptBytes());
          blockStore.addUnspentTransactionOutput(newOut);
          txOutsCreated.add(newOut);
        }
        // All values were already checked for being non-negative (as it is verified in
        // Transaction.verify())
        // but we check again here just for defence in depth. Transactions with zero output value
        // are OK.
        if (valueOut.signum() < 0 || valueOut.compareTo(NetworkParameters.MAX_MONEY) > 0)
          throw new VerificationException("Transaction output value out of range");

        if (!isCoinBase && runScripts) {
          // Because correctlySpends modifies transactions, this must come after we are done with tx
          FutureTask<VerificationException> future =
              new FutureTask<VerificationException>(new Verifier(tx, prevOutScripts, verifyFlags));
          scriptVerificationExecutor.execute(future);
          listScriptVerificationResults.add(future);
        }
      }
      for (Future<VerificationException> future : listScriptVerificationResults) {
        VerificationException e;
        try {
          e = future.get();
        } catch (InterruptedException thrownE) {
          throw new RuntimeException(thrownE); // Shouldn't happen
        } catch (ExecutionException thrownE) {
          log.error("Script.correctlySpends threw a non-normal exception: " + thrownE.getCause());
          throw new VerificationException(
              "Bug in Script.correctlySpends, likely script malformed in some new and interesting way.",
              thrownE);
        }
        if (e != null) throw e;
      }
    } catch (VerificationException e) {
      scriptVerificationExecutor.shutdownNow();
      blockStore.abortDatabaseBatchWrite();
      throw e;
    } catch (BlockStoreException e) {
      scriptVerificationExecutor.shutdownNow();
      blockStore.abortDatabaseBatchWrite();
      throw e;
    }
    return new TransactionOutputChanges(txOutsCreated, txOutsSpent);
  }