Support "standalone" mode (-a or --standalone) in which we do not connect

to the network and do not close ledgers. This mode makes it much easier to
test transactions as they are only applied once to the open ledger.

src/Application.cpp

@@ -95,13 +95,14 @@ void Application::run()
 	//
 	// Set up UNL.
 	//
-	getUNL().nodeBootstrap();
+	if (!theConfig.RUN_STANDALONE)
+		getUNL().nodeBootstrap();
 
 
 	//
 	// Allow peer connections.
 	//
-	if (!theConfig.PEER_IP.empty() && theConfig.PEER_PORT)
+	if (!theConfig.RUN_STANDALONE && !theConfig.PEER_IP.empty() && theConfig.PEER_PORT)
 	{
 		mPeerDoor = new PeerDoor(mIOService);
 	}
@@ -127,7 +128,8 @@ void Application::run()
 	//
 	// Begin connecting to network.
 	//
-	mConnectionPool.start();
+	if (!theConfig.RUN_STANDALONE)
+		mConnectionPool.start();
 
 	// New stuff.
 	NewcoinAddress	rootSeedMaster		= NewcoinAddress::createSeedGeneric("masterpassphrase");
@@ -155,7 +157,14 @@ void Application::run()
 	}
 
 
-	mNetOps.setStateTimer();
+	if (theConfig.RUN_STANDALONE)
+	{
+		Log(lsWARNING) << "Running in standalone mode";
+		mNetOps.setStandAlone();
+		mMasterLedger.runStandAlone();
+	}
+	else
+		mNetOps.setStateTimer();
 
 	mIOService.run(); // This blocks
 

src/Config.cpp

@@ -40,6 +40,11 @@
 
 Config theConfig;
 
+void Config::init()
+{
+	RUN_STANDALONE = false;
+}
+
 void Config::setup(const std::string& strConf)
 {
 	boost::system::error_code	ec;

src/Config.h

@@ -63,6 +63,7 @@ public:
 	int							LEDGER_PROPOSAL_DELAY_SECONDS;
 	int							LEDGER_AVALANCHE_SECONDS;
 	bool						LEDGER_CREATOR;     // should be false unless we are starting a new ledger
+	bool						RUN_STANDALONE;
 
 	// Note: The following parameters do not relate to the UNL or trust at all
 	unsigned int				NETWORK_QUORUM;			// Minimum number of nodes to consider the network present
@@ -100,6 +101,7 @@ public:
 	// Client behavior
 	int							ACCOUNT_PROBE_MAX;		// How far to scan for accounts.
 
+	void init();
 	void setup(const std::string& strConf);
 	void load();
 };

src/ConnectionPool.cpp

@@ -42,6 +42,9 @@ ConnectionPool::ConnectionPool(boost::asio::io_service& io_service) :
 
 void ConnectionPool::start()
 {
+	if (theConfig.RUN_STANDALONE)
+		return;
+
 	// Start running policy.
 	policyEnforce();
 
@@ -243,6 +246,8 @@ void ConnectionPool::relayMessage(Peer* fromPeer, PackedMessage::pointer msg)
 // Requires sane IP and port.
 void ConnectionPool::connectTo(const std::string& strIp, int iPort)
 {
+	if (theConfig.RUN_STANDALONE)
+		return;
 	{
 		Database*	db	= theApp->getWalletDB()->getDB();
 		ScopedLock	sl(theApp->getWalletDB()->getDBLock());

src/LedgerMaster.h

@@ -43,6 +43,8 @@ public:
 	// The finalized ledger is the last closed/accepted ledger
 	Ledger::pointer getClosedLedger()	{ return mFinalizedLedger; }
 
+	void runStandAlone()				{ mFinalizedLedger = mCurrentLedger; }
+
 	TransactionEngineResult doTransaction(const SerializedTransaction& txn, uint32 targetLedger,
 		TransactionEngineParams params);
 

src/NetworkOPs.cpp

@@ -333,7 +333,7 @@ public:
 
 void NetworkOPs::checkState(const boost::system::error_code& result)
 { // Network state machine
-	if (result == boost::asio::error::operation_aborted)
+	if ((result == boost::asio::error::operation_aborted) || theConfig.RUN_STANDALONE)
 		return;
 	setStateTimer();
 
@@ -680,7 +680,7 @@ void NetworkOPs::setMode(OperatingMode om)
 		mConnectTime = boost::posix_time::second_clock::universal_time();
 	Log l((om < mMode) ? lsWARNING : lsINFO);
 	if (om == omDISCONNECTED)
-		l << "STATE->Disonnected";
+		l << "STATE->Disconnected";
 	else if (om == omCONNECTED)
 		l << "STATE->Connected";
 	else if (om == omTRACKING)

src/RPCServer.cpp

@@ -832,6 +832,9 @@ Json::Value RPCServer::doAccountWalletSet(const Json::Value& params) {
 
 Json::Value RPCServer::doConnect(const Json::Value& params)
 {
+	if (theConfig.RUN_STANDALONE)
+		return "cannot connect in standalone mode";
+
 	// connect <ip> [port]
 	std::string strIp;
 	int			iPort	= -1;

src/main.cpp

@@ -84,6 +84,7 @@ int main(int argc, char* argv[])
 	int					iResult	= 0;
 	po::variables_map	vm;										// Map of options.
 	bool				bTest	= false;
+	theConfig.init();
 
 	//
 	// Set up option parsing.
@@ -93,6 +94,7 @@ int main(int argc, char* argv[])
 		("help,h", "Display this message.")
 		("conf", po::value<std::string>(), "Specify the configuration file.")
 		("rpc", "Perform rpc command (default).")
+		("standalone,a", "Run with no peers.")
 		("test,t", "Perform unit tests.")
 		("parameters", po::value< vector<string> >(), "Specify comma separated parameters.")
 		("verbose,v", "Increase log level")
@@ -142,6 +144,11 @@ int main(int argc, char* argv[])
 		Log::setMinSeverity(lsTRACE);
 	}
 
+	if (vm.count("standalone"))
+	{
+		theConfig.RUN_STANDALONE = true;
+	}
+
 	if (!iResult)
 	{
 		theConfig.setup(vm.count("conf") ? vm["conf"].as<std::string>() : "");