Bug fix for state transitioning - don't change nonce until after

guaranteed no collision has occured.

TODO

@@ -44,6 +44,7 @@ Robustness
 - Store version alongside BC DB.
 - Better handling of corrupt blocks.
   - Kill DB & restart.
+- Avoid transactions with future invalid nonces until additional transactions are processed.
 
 GUI
 - Make address/block chain list model-based, JIT populated.

libethereum/State.cpp

@@ -624,12 +624,19 @@ void State::unapplyRewards(Addresses const& _uncleAddresses)
 
 void State::executeBare(Transaction const& _t, Address _sender)
 {
+	commit();
+	clog(StateChat) << "State:" << rootHash();
+	clog(StateChat) << "Executing TX:" << _t;
+
 	// Entry point for a contract-originated transaction.
 
 	// Ignore invalid transactions.
 	auto nonceReq = transactionsFrom(_sender);
 	if (_t.nonce != nonceReq)
+	{
+		clog(StateChat) << "Invalid Nonce.";
 		throw InvalidNonce(nonceReq, _t.nonce);
+	}
 
 	unsigned nonZeroData = 0;
 	for (auto i: _t.data)
@@ -639,13 +646,16 @@ void State::executeBare(Transaction const& _t, Address _sender)
 
 	// Not considered invalid - just pointless.
 	if (balance(_sender) < _t.value + fee)
+	{
+		clog(StateChat) << "Not enough cash.";
 		throw NotEnoughCash();
+	}
 
+	if (_t.receiveAddress)
+	{
 		// Increment associated nonce for sender.
 		noteSending(_sender);
 
-	if (_t.receiveAddress)
-	{
 		subBalance(_sender, _t.value + fee);
 		addBalance(_t.receiveAddress, _t.value);
 
@@ -658,8 +668,7 @@ void State::executeBare(Transaction const& _t, Address _sender)
 			}
 			catch (VMException const& _e)
 			{
-				cnote << "VM Exception: " << _e.description();
-				throw;
+				clog(StateChat) << "VM Exception: " << _e.description();
 			}
 		}
 	}
@@ -670,12 +679,21 @@ void State::executeBare(Transaction const& _t, Address _sender)
 #else
 		if (_t.value < fee)
 #endif
+		{
+			clog(StateChat) << "Not enough cash.";
 			throw NotEnoughCash();
+		}
 
 		Address newAddress = right160(_t.sha3());
 
 		if (isContractAddress(newAddress) || isNormalAddress(newAddress))
+		{
+			clog(StateChat) << "Contract address collision.";
 			throw ContractAddressCollision();
+		}
+
+		// Increment associated nonce for sender.
+		noteSending(_sender);
 
 		// All OK - set it up.
 		m_cache[newAddress] = AddressState(0, 0, AddressType::Contract);
@@ -698,6 +716,8 @@ void State::executeBare(Transaction const& _t, Address _sender)
 		addBalance(newAddress, _t.value - fee);
 #endif
 	}
+	commit();
+	clog(StateChat) << "New state:" << rootHash();
 }
 
 void State::execute(Address _myAddress, Address _txSender, u256 _txValue, u256s const& _txData, u256* _totalFee)

libethereum/State.h

@@ -48,6 +48,8 @@ std::map<Address, AddressState> const& genesisState();
 
 static const std::map<u256, u256> EmptyMapU256U256;
 
+struct StateChat: public LogChannel { static const char* name() { return "=S="; } static const int verbosity = 4; };
+
 class ExtVM;
 
 /**

walleth/MainWin.cpp

@@ -1,5 +1,6 @@
 #include <QtNetwork/QNetworkReply>
 #include <QtQuick/QQuickView>
+#include <QtQml/QQmlContext>
 #include <QtWidgets/QMessageBox>
 #include <QtWidgets/QInputDialog>
 #include <QtGui/QClipboard>
@@ -77,8 +78,8 @@ Main::Main(QWidget *parent) :
 */
 	m_view = new QQuickView();
 	QQmlContext* context = m_view->rootContext();
-/*	context->setContextProperty("libs", libs());
-	context->setContextProperty("compute", compute());
+//	context->setContextProperty("eth", m_eth);
+/*	context->setContextProperty("compute", compute());
 	context->setContextProperty("data", data());
 	context->setContextProperty("graphs", graphs());
 	context->setContextProperty("audio", audio());
@@ -87,7 +88,6 @@ Main::Main(QWidget *parent) :
 
 
 	QWidget* w = QWidget::createWindowContainer(m_view);
-	w->setAcceptDrops(true);
 	m_view->setResizeMode(QQuickView::SizeRootObjectToView);
 	ui->fullDisplay->insertWidget(0, w);
 	m_view->create();

walleth/MainWin.h

@@ -18,6 +18,11 @@ class State;
 
 class QQuickView;
 
+class QEthereum
+{
+
+};
+
 class Main : public QMainWindow
 {
 	Q_OBJECT
@@ -71,6 +76,8 @@ private:
 	QQuickView* m_view;
 
 	QNetworkAccessManager m_webCtrl;
+
+	QEthereum m_eth;
 };
 
 #endif // MAIN_H

walleth/Simple.qml

@@ -0,0 +1,17 @@
+import QtQuick 2.1
+import QtQuick.Controls 1.0
+import QtQuick.Layouts 1.0
+
+Item {
+	id: main
+	anchors.fill: parent
+	anchors.margins: 9
+	Label {
+		text: "This fills the whole cell"
+		Layout.minimumHeight: 30
+		Layout.fillHeight: true
+		Layout.fillWidth: true
+	}
+
+
+}