calculate bandwidth

HTTPServer.cpp

@@ -660,8 +660,10 @@ namespace util
 		} 
 		s << "<br>";
 		s << "<b>Tunnel creation success rate:</b> " << i2p::tunnel::tunnels.GetTunnelCreationSuccessRate () << "%<br>";
-		s << "<b>Received:</b> " << i2p::transport::transports.GetTotalReceivedBytes ()/1000 << "K<br>";
+		s << "<b>Received:</b> " << i2p::transport::transports.GetTotalReceivedBytes ()/1000 << "K";
-		s << "<b>Sent:</b> " << i2p::transport::transports.GetTotalSentBytes ()/1000 << "K<br>";
+		s << " (" << i2p::transport::transports.GetInBandwidth () <<" Bps)<br>";
+		s << "<b>Sent:</b> " << i2p::transport::transports.GetTotalSentBytes ()/1000 << "K";
+		s << " (" << i2p::transport::transports.GetOutBandwidth () <<" Bps)<br>";
 		s << "<b>Data path:</b> " << i2p::util::filesystem::GetDataDir().string() << "<br><br>";
 		s << "<b>Our external address:</b>" << "<br>" ;
 		for (auto& address : i2p::context.GetRouterInfo().GetAddresses())

Transports.cpp

@@ -97,7 +97,8 @@ namespace transport
 	Transports::Transports (): 
 		m_IsRunning (false), m_Thread (nullptr), m_Work (m_Service), m_PeerCleanupTimer (m_Service),
 		m_NTCPServer (nullptr), m_SSUServer (nullptr), m_DHKeysPairSupplier (5), // 5 pre-generated keys
-		m_TotalSentBytes(0), m_TotalReceivedBytes(0)
+		m_TotalSentBytes(0), m_TotalReceivedBytes(0), m_InBandwidth (0), m_OutBandwidth (0),
+		m_LastInBandwidthUpdateBytes (0), m_LastOutBandwidthUpdateBytes (0), m_LastBandwidthUpdateTime (0)	
 	{		
 	}
 		
@@ -181,6 +182,23 @@ namespace transport
 		}	
 	}
 		
+	void Transports::UpdateBandwidth ()
+	{
+		uint64_t ts = i2p::util::GetMillisecondsSinceEpoch ();
+		if (m_LastBandwidthUpdateTime > 0)
+		{
+			auto delta = ts - m_LastBandwidthUpdateTime;
+			if (delta > 0)
+			{
+				m_InBandwidth = (m_TotalReceivedBytes - m_LastInBandwidthUpdateBytes)*1000/ts; // per second 
+				m_OutBandwidth = (m_TotalSentBytes - m_LastOutBandwidthUpdateBytes)*1000/ts; // per second 
+			} 
+		}
+		m_LastBandwidthUpdateTime = ts;
+		m_LastInBandwidthUpdateBytes = m_TotalReceivedBytes;	
+		m_LastOutBandwidthUpdateBytes = m_TotalSentBytes;		
+	}
+
 
 	void Transports::SendMessage (const i2p::data::IdentHash& ident, i2p::I2NPMessage * msg)
 	{
@@ -471,6 +489,7 @@ namespace transport
 				else
 					it++;
 			}
+			UpdateBandwidth (); // TODO: use separate timer(s) for it
 			m_PeerCleanupTimer.expires_from_now (boost::posix_time::seconds(5*SESSION_CREATION_TIMEOUT));
 			m_PeerCleanupTimer.async_wait (std::bind (&Transports::HandlePeerCleanupTimer, this, std::placeholders::_1));
 		}	

Transports.h

@@ -93,6 +93,8 @@ namespace transport
 			void UpdateReceivedBytes (uint64_t numBytes) { m_TotalReceivedBytes += numBytes; };
 			uint64_t GetTotalSentBytes () const { return m_TotalSentBytes; };
 			uint64_t GetTotalReceivedBytes () const { return m_TotalReceivedBytes; };		
+			uint32_t GetInBandwidth () const { return m_InBandwidth; }; // bytes per second
+			uint32_t GetOutBandwidth () const { return m_OutBandwidth; }; // bytes per second
 
 		private:
 
@@ -109,6 +111,7 @@ namespace transport
 			void HandleNTCPResolve (const boost::system::error_code& ecode, boost::asio::ip::tcp::resolver::iterator it,
  				i2p::data::IdentHash ident, std::shared_ptr<boost::asio::ip::tcp::resolver> resolver);
 
+			void UpdateBandwidth ();
 			void DetectExternalIP ();
 			
 		private:
@@ -124,7 +127,11 @@ namespace transport
 			std::map<i2p::data::IdentHash, Peer> m_Peers;
 			
 			DHKeysPairSupplier m_DHKeysPairSupplier;
+
 			std::atomic<uint64_t> m_TotalSentBytes, m_TotalReceivedBytes;
+			uint32_t m_InBandwidth, m_OutBandwidth;
+			uint64_t m_LastInBandwidthUpdateBytes, m_LastOutBandwidthUpdateBytes;	
+			uint64_t m_LastBandwidthUpdateTime;		
 
 		public: