Initial scaning support

src/Application.cpp

@@ -44,6 +44,7 @@ DatabaseCon::~DatabaseCon()
 Application::Application() :
 	mUNL(mIOService),
 	mTxnDB(NULL), mLedgerDB(NULL), mWalletDB(NULL), mHashNodeDB(NULL), mNetNodeDB(NULL),
+	mConnectionPool(mIOService),
 	mPeerDoor(NULL), mRPCDoor(NULL)
 {
 	nothing();

src/ConnectionPool.cpp

@@ -1,18 +1,19 @@
 
-#include <boost/asio.hpp>
-#include <boost/foreach.hpp>
-
 #include "ConnectionPool.h"
 #include "Config.h"
 #include "Peer.h"
 #include "Application.h"
 #include "utils.h"
 
-// XXX On Windows make sure OpenSSL PRNG is seeded: EGADS
+#include <boost/asio.hpp>
+#include <boost/bind.hpp>
+#include <boost/foreach.hpp>
+#include <boost/format.hpp>
 
-ConnectionPool::ConnectionPool() :
+ConnectionPool::ConnectionPool(boost::asio::io_service& io_service) :
-	iConnecting(0),
+	mCtx(boost::asio::ssl::context::sslv23),
-	mCtx(boost::asio::ssl::context::sslv23)
+	bScanning(false),
+	mScanTimer(io_service)
 {
 	mCtx.set_options(
 		boost::asio::ssl::context::default_workarounds
@@ -26,6 +27,9 @@ ConnectionPool::ConnectionPool() :
 void ConnectionPool::start()
 {
 	// XXX Start running policy.
+
+	// Start scanning.
+	scanRefresh();
 }
 
 // XXX Broken: also don't send a message to a peer if we got it from the peer.
@@ -75,6 +79,7 @@ bool ConnectionPool::peerRegister(Peer::pointer peer, const std::string& strIp,
 
 bool ConnectionPool::connectTo(const std::string& strIp, int iPort)
 {
+	bool	bConnecting;
 	ipPort	ip	= make_pair(strIp, iPort);
 
     boost::unordered_map<ipPort, Peer::pointer>::iterator	it;
@@ -94,15 +99,19 @@ bool ConnectionPool::connectTo(const std::string& strIp, int iPort)
 		mIpMap[ip]	= peer;
 
 		peer->connect(strIp, iPort);
+
+		bConnecting	= true;
 	}
 	else
 	{
 		// Found it.  Already connected.
 		std::cerr << "ConnectionPool::connectTo: Already connected: "
 			<< strIp << " " << iPort << std::endl;
+
+		bConnecting	= false;
 	}
 
-	return true;
+	return bConnecting;
 }
 
 Json::Value ConnectionPool::getPeersJson()
@@ -183,6 +192,143 @@ void ConnectionPool::peerDisconnected(Peer::pointer peer, const ipPort& ipPeer,
 	}
 }
 
+void ConnectionPool::peerFailed(const std::string& strIp, int iPort)
+{
+	if (bScanning && !mScanIp.compare(strIp), mScanPort == iPort)
+	{
+		bScanning	= false;
+		scanRefresh();
+	}
+}
+
+void ConnectionPool::peerVerified(const std::string& strIp, int iPort)
+{
+	if (bScanning && !mScanIp.compare(strIp), mScanPort == iPort)
+	{
+		// Scan completed successfully.
+		{
+			ScopedLock sl(theApp->getWalletDB()->getDBLock());
+			Database *db=theApp->getWalletDB()->getDB();
+
+			db->executeSQL(str(boost::format("UPDATE PeerIps SET ScanNext=NULL,ScanInterval=0 WHERE IP=%s AND Port=%d;")
+				% db->escape(strIp)
+				% iPort));
+			// XXX Check error.
+		}
+
+		bScanning	= false;
+		scanRefresh();
+	}
+}
+
+void ConnectionPool::scanHandler(const boost::system::error_code& ecResult)
+{
+	if (ecResult == boost::asio::error::operation_aborted)
+	{
+		nothing();
+	}
+	else if (!ecResult)
+	{
+		scanRefresh();
+	}
+	else
+	{
+		throw std::runtime_error("Internal error: unexpected deadline error.");
+	}
+}
+
+// Scan ips as per db entries.
+void ConnectionPool::scanRefresh()
+{
+	if (bScanning)
+	{
+		// Currently scanning, will scan again after completion.
+		std::cerr << "scanRefresh: already scanning" << std::endl;
+
+		nothing();
+	}
+	else
+	{
+		// Discover if there are entries that need scanning.
+		boost::posix_time::ptime	tpNext;
+		boost::posix_time::ptime	tpNow;
+		std::string					strIp;
+		int							iPort;
+		int							iInterval;
+
+		{
+			ScopedLock sl(theApp->getWalletDB()->getDBLock());
+			Database *db=theApp->getWalletDB()->getDB();
+
+			if (db->executeSQL("SELECT * FROM PeerIps INDEXED BY PeerScanIndex WHERE ScanNext NOT NULL ORDER BY ScanNext LIMIT 1;")
+				&& db->startIterRows())
+			{
+				// Have an entry to scan.
+				int			iNext	= db->getInt("ScanNext");
+
+				tpNext	= ptFromSeconds(iNext);
+				tpNow	= boost::posix_time::second_clock::universal_time();
+
+				db->getStr("IP", strIp);
+				iPort		= db->getInt("Port");
+				iInterval	= db->getInt("ScanInterval");
+			}
+			else
+			{
+				// No entries to scan.
+				tpNow	= boost::posix_time::ptime(boost::posix_time::not_a_date_time);
+			}
+		}
+
+		if (tpNow.is_not_a_date_time())
+		{
+			std::cerr << "scanRefresh: no scan needed." << std::endl;
+
+			(void) mScanTimer.cancel();
+		}
+		else if (tpNext <= tpNow)
+		{
+			// Scan it.
+			(void) mScanTimer.cancel();
+
+			std::cerr << "scanRefresh: scanning: " << strIp << " " << iPort << std::endl;
+			bScanning	= true;
+			mScanIp		= strIp;
+			mScanPort	= iPort;
+
+			iInterval	*= 2;
+			iInterval	= MAX(iInterval, theConfig.PEER_SCAN_INTERVAL_MIN);
+
+			tpNext		= tpNow + boost::posix_time::seconds(iInterval);
+
+			{
+				ScopedLock sl(theApp->getWalletDB()->getDBLock());
+				Database *db=theApp->getWalletDB()->getDB();
+
+				db->executeSQL(str(boost::format("UPDATE PeerIps SET ScanNext=%d,ScanInterval=%d WHERE IP=%s AND Port=%d;")
+					% iToSeconds(tpNext)
+					% iInterval
+					% db->escape(strIp)
+					% iPort));
+				// XXX Check error.
+			}
+
+			if (!connectTo(mScanIp, mScanPort))
+			{
+				// Already connected. Try again.
+				scanRefresh();
+			}
+		}
+		else
+		{
+			std::cerr << "scanRefresh: next due: " << tpNow << std::endl;
+
+			mScanTimer.expires_at(tpNext);
+			mScanTimer.async_wait(boost::bind(&ConnectionPool::scanHandler, this, _1));
+		}
+	}
+}
+
 #if 0
 bool ConnectionPool::isMessageKnown(PackedMessage::pointer msg)
 {

src/ConnectionPool.h

@@ -18,10 +18,6 @@ private:
 
 	typedef std::pair<NewcoinAddress, Peer::pointer>	naPeer;
 
-	// Count of peers we are in progress of connecting to.
-	// We are in progress until we know their network public key.
-	int			iConnecting;
-
 	// Peers we are connecting with and non-thin peers we are connected to.
     boost::unordered_map<ipPort, Peer::pointer>			mIpMap;
 
@@ -30,8 +26,15 @@ private:
 
     boost::asio::ssl::context							mCtx;
 
+	bool												bScanning;
+	boost::asio::deadline_timer							mScanTimer;
+	std::string											mScanIp;
+	int													mScanPort;
+
+	void		scanHandler(const boost::system::error_code& ecResult);
+
 public:
-	ConnectionPool();
+	ConnectionPool(boost::asio::io_service& io_service);
 
 	// Begin enforcing connection policy.
 	void start();
@@ -56,8 +59,20 @@ public:
 	// No longer connected.
 	void peerDisconnected(Peer::pointer peer, const ipPort& ipPeer, const NewcoinAddress& naPeer);
 
+	// As client accepted.
+	void peerVerified(const std::string& strIp, int iPort);
+
+	// As client failed connect and be accepted.
+	void peerFailed(const std::string& strIp, int iPort);
+
 	Json::Value getPeersJson();
 
+	//
+	// Scanning
+	//
+
+	void scanRefresh();
+
 #if 0
 	//std::vector<std::pair<PackedMessage::pointer,int> > mBroadcastMessages;
 

src/Peer.cpp

@@ -63,6 +63,9 @@ void Peer::detach()
 	// mSocketSsl.close();
 
 	if (!mIpPort.first.empty()) {
+		if (mClientConnect)
+			theApp->getConnectionPool().peerFailed(mIpPort.first, mIpPort.second);
+
 		theApp->getConnectionPool().peerDisconnected(shared_from_this(), mIpPort, mNodePublic);
 		mIpPort.first.clear();
 	}
@@ -97,6 +100,8 @@ void Peer::connect(const std::string strIp, int iPort)
 {
 	int	iPortAct	= iPort < 0 ? SYSTEM_PEER_PORT : iPort;
 
+	mClientConnect	= true;
+
 	std::cerr  << "Peer::connect: " << strIp << " " << iPort << std::endl;
 	mIpPort		= make_pair(strIp, iPort);
 
@@ -156,7 +161,7 @@ void Peer::handleStart(const boost::system::error_code& error)
 	}
 }
 
-// Connect as client.
+// Connect ssl as client.
 void Peer::handleConnect(const boost::system::error_code& error, boost::asio::ip::tcp::resolver::iterator it)
 {
 	if (error)
@@ -176,13 +181,15 @@ void Peer::handleConnect(const boost::system::error_code& error, boost::asio::ip
 	}
 }
 
-// Connect as server.
+// Connect ssl as server.
 void Peer::connected(const boost::system::error_code& error)
 {
 	boost::asio::ip::tcp::endpoint	ep		= mSocketSsl.lowest_layer().remote_endpoint();
 	int								iPort	= ep.port();
 	std::string						strIp	= ep.address().to_string();
 
+	mClientConnect	= false;
+
 	if (iPort == SYSTEM_PEER_PORT)
 		iPort	= -1;
 
@@ -502,6 +509,14 @@ void Peer::recvHello(newcoin::TMHello& packet)
 		// Cancel verification timeout.
 		(void) mVerifyTimer.cancel();
 
+		if (mClientConnect)
+		{
+			theApp->getConnectionPool().peerVerified(mIpPort.first, mIpPort.second);
+
+			// No longer connecting as client.
+			mClientConnect	= false;
+		}
+
 		// XXX Set timer: connection is in grace period to be useful.
 		// XXX Set timer: connection idle (idle may vary depending on connection type.)
 

src/Peer.h

@@ -31,6 +31,7 @@ public:
 	void			handleConnect(const boost::system::error_code& error, boost::asio::ip::tcp::resolver::iterator it);
 
 private:
+	bool			mClientConnect;		// In process of connecting as client.
 	NewcoinAddress	mNodePublic;		// Node public key of peer.
 	ipPort			mIpPort;
 	uint256			mCookieHash;