From c348736058a94ad2dc19792fac24b9d6a376ed6c Mon Sep 17 00:00:00 2001
From: orignal <i2porignal@yandex.ru>
Date: Sun, 19 Jun 2022 14:21:35 -0400
Subject: [PATCH] send updated local RouterInfo for long sessions

---
 libi2pd/Transports.cpp | 19 ++++++++++++++++---
 libi2pd/Transports.h   |  6 ++++--
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/libi2pd/Transports.cpp b/libi2pd/Transports.cpp
index 32651904..31abad6e 100644
--- a/libi2pd/Transports.cpp
+++ b/libi2pd/Transports.cpp
@@ -415,9 +415,10 @@ namespace transport
 				auto r = netdb.FindRouter (ident);
 				if (r && (r->IsUnreachable () || !r->IsReachableFrom (i2p::context.GetRouterInfo ()))) return; // router found but non-reachable
 				{
+					auto ts = i2p::util::GetSecondsSinceEpoch ();
 					std::unique_lock<std::mutex> l(m_PeersMutex);
 					it = m_Peers.insert (std::pair<i2p::data::IdentHash, Peer>(ident, { 0, r, {},
-						i2p::util::GetSecondsSinceEpoch (), {} })).first;
+						ts, ts + PEER_ROUTER_INFO_UPDATE_INTERVAL, {} })).first;
 				}
 				connected = ConnectToPeer (ident, it->second);
 			}
@@ -753,8 +754,10 @@ namespace transport
 					return;
 				}
 				session->SendI2NPMessages ({ CreateDatabaseStoreMsg () }); // send DatabaseStore
-				std::unique_lock<std::mutex>	l(m_PeersMutex);
-				m_Peers.insert (std::make_pair (ident, Peer{ 0, nullptr, { session }, i2p::util::GetSecondsSinceEpoch (), {} }));
+				auto ts = i2p::util::GetSecondsSinceEpoch ();
+				std::unique_lock<std::mutex> l(m_PeersMutex);
+				m_Peers.insert (std::make_pair (ident, Peer{ 0, nullptr, { session },
+					ts, ts + PEER_ROUTER_INFO_UPDATE_INTERVAL, {} }));
 			}
 		});
 	}
@@ -815,7 +818,17 @@ namespace transport
 					it = m_Peers.erase (it);
 				}
 				else
+				{
+					if (ts > it->second.nextRouterInfoUpdateTime)
+					{
+						auto session = it->second.sessions.front ();
+						if (session)
+							session->SendLocalRouterInfo (true);
+						it->second.nextRouterInfoUpdateTime = ts + PEER_ROUTER_INFO_UPDATE_INTERVAL + 
+							rand () % PEER_ROUTER_INFO_UPDATE_INTERVAL_VARIANCE;
+					}	
 					++it;
+				}	
 			}
 			UpdateBandwidth (); // TODO: use separate timer(s) for it
 			bool ipv4Testing = i2p::context.GetStatus () == eRouterStatusTesting;
diff --git a/libi2pd/Transports.h b/libi2pd/Transports.h
index 80d1855e..8fdf6055 100644
--- a/libi2pd/Transports.h
+++ b/libi2pd/Transports.h
@@ -62,12 +62,14 @@ namespace transport
 	};
 	typedef EphemeralKeysSupplier<i2p::crypto::X25519Keys> X25519KeysPairSupplier;
 
+	const int PEER_ROUTER_INFO_UPDATE_INTERVAL = 31*60; // in seconds  
+	const int PEER_ROUTER_INFO_UPDATE_INTERVAL_VARIANCE = 7*60; // in seconds  
 	struct Peer
 	{
 		int numAttempts;
 		std::shared_ptr<const i2p::data::RouterInfo> router;
 		std::list<std::shared_ptr<TransportSession> > sessions;
-		uint64_t creationTime;
+		uint64_t creationTime, nextRouterInfoUpdateTime;
 		std::vector<std::shared_ptr<i2p::I2NPMessage> > delayedMessages;
 
 		void Done ()
@@ -77,7 +79,7 @@ namespace transport
 		}
 	};
 
-	const size_t SESSION_CREATION_TIMEOUT = 15; // in seconds
+	const uint64_t SESSION_CREATION_TIMEOUT = 15; // in seconds
 	const int PEER_TEST_INTERVAL = 71; // in minutes
 	const int MAX_NUM_DELAYED_MESSAGES = 150;
 	class Transports