simplewallet: new net_stats command

displays total sent and received bytes

contrib/epee/include/net/net_helper.h

@@ -108,7 +108,9 @@ namespace net_utils
 				m_initialized(true),
 				m_connected(false),
 				m_deadline(m_io_service),
-				m_shutdowned(0)
+				m_shutdowned(0),
+				m_bytes_sent(0),
+				m_bytes_received(0)
 		{
 		}
 
@@ -313,6 +315,7 @@ namespace net_utils
 				}else
 				{
 					m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
+					m_bytes_sent += buff.size();
 				}
 			}
 
@@ -369,6 +372,7 @@ namespace net_utils
 				}else
 				{
 					m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
+					m_bytes_sent += sz;
 				}
 			}
 
@@ -458,6 +462,7 @@ namespace net_utils
 				/*if(!bytes_transfered)
 					return false;*/
 
+				m_bytes_received += bytes_transfered;
 				buff.assign(local_buff, bytes_transfered);
 				return true;
 			}
@@ -526,6 +531,7 @@ namespace net_utils
 					m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
 				}
 
+				m_bytes_received += bytes_transfered;
 				if(bytes_transfered != buff.size())
 				{
 					LOG_ERROR("Transferred mismatch with transfer_at_least value: m_bytes_transferred=" << bytes_transfered << " at_least value=" << buff.size());
@@ -581,7 +587,17 @@ namespace net_utils
 		{
 			return m_ssl_socket->next_layer();
 		}
-		
+
+		uint64_t get_bytes_sent() const
+		{
+			return m_bytes_sent;
+		}
+
+		uint64_t get_bytes_received() const
+		{
+			return m_bytes_received;
+		}
+
 	private:
 
 		void check_deadline()
@@ -667,6 +683,8 @@ namespace net_utils
 		bool m_connected;
 		boost::asio::steady_timer m_deadline;
 		volatile uint32_t m_shutdowned;
+		std::atomic<uint64_t> m_bytes_sent;
+		std::atomic<uint64_t> m_bytes_received;
 	};