postpone reading from file and updating router profile

libi2pd/NetDb.cpp

@@ -119,8 +119,9 @@ namespace data
 		i2p::util::SetThreadName("NetDB");
 
 		uint64_t lastManage = 0;
-		uint64_t lastProfilesCleanup = i2p::util::GetMonotonicMilliseconds (), lastObsoleteProfilesCleanup = lastProfilesCleanup;
+		uint64_t lastProfilesCleanup = i2p::util::GetMonotonicMilliseconds (), 
-		int16_t profilesCleanupVariance = 0, obsoleteProfilesCleanVariance = 0;
+			lastObsoleteProfilesCleanup = lastProfilesCleanup, lastApplingProfileUpdates = lastProfilesCleanup;
+		int16_t profilesCleanupVariance = 0, obsoleteProfilesCleanVariance = 0, applingProfileUpdatesVariance = 0;
 
 		std::list<std::shared_ptr<const I2NPMessage> > msgs;
 		while (m_IsRunning)
@@ -199,6 +200,19 @@ namespace data
 					lastObsoleteProfilesCleanup = mts;
 					obsoleteProfilesCleanVariance = rand () % i2p::data::PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_VARIANCE;
 				}	
+				if (mts >= lastApplingProfileUpdates + i2p::data::PEER_PROFILE_APPLY_POSTPONED_TIMEOUT + applingProfileUpdatesVariance)
+				{
+					bool isAppling = m_ApplingProfileUpdates.valid ();
+					if (isAppling && m_ApplingProfileUpdates.wait_for(std::chrono::seconds(0)) == std::future_status::ready) // still active?
+					{
+						m_ApplingProfileUpdates.get ();
+						isAppling = false;
+					}	
+					if (!isAppling)
+						m_ApplingProfileUpdates = i2p::data::FlushPostponedRouterProfileUpdates ();
+					lastApplingProfileUpdates = mts;
+					applingProfileUpdatesVariance = rand () % i2p::data::PEER_PROFILE_APPLY_POSTPONED_TIMEOUT_VARIANCE;
+				}	
 			}
 			catch (std::exception& ex)
 			{

libi2pd/NetDb.hpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -185,7 +185,7 @@ namespace data
 			std::shared_ptr<NetDbRequests> m_Requests;
 
 			bool m_PersistProfiles;
-			std::future<void> m_SavingProfiles, m_DeletingProfiles, m_PersistingRouters;
+			std::future<void> m_SavingProfiles, m_DeletingProfiles, m_ApplingProfileUpdates, m_PersistingRouters;
 
 			std::vector<std::shared_ptr<const RouterInfo> > m_ExploratorySelection;
 			uint64_t m_LastExploratorySelectionUpdateTime; // in monotonic seconds

libi2pd/Profiling.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -27,7 +27,9 @@ namespace data
 	static i2p::fs::HashedStorage g_ProfilesStorage("peerProfiles", "p", "profile-", "txt");
 	static std::unordered_map<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > g_Profiles;
 	static std::mutex g_ProfilesMutex;
-
+	static std::list<std::pair<i2p::data::IdentHash, std::function<void (std::shared_ptr<RouterProfile>)> > > g_PostponedUpdates;
+	static std::mutex g_PostponedUpdatesMutex;
+	
 	RouterProfile::RouterProfile ():
 		m_IsUpdated (false), m_LastDeclineTime (0), m_LastUnreachableTime (0),
 		m_LastUpdateTime (i2p::util::GetSecondsSinceEpoch ()), 
@@ -259,14 +261,14 @@ namespace data
 		}
 		auto profile = netdb.NewRouterProfile ();
 		profile->Load (identHash); // if possible
-		std::unique_lock<std::mutex> l(g_ProfilesMutex);
+		std::lock_guard<std::mutex> l(g_ProfilesMutex);
 		g_Profiles.emplace (identHash, profile);
 		return profile;
 	}
 
 	bool IsRouterBanned (const IdentHash& identHash)
 	{
-		std::unique_lock<std::mutex> l(g_ProfilesMutex);
+		std::lock_guard<std::mutex> l(g_ProfilesMutex);
 		auto it = g_Profiles.find (identHash);
 		if (it != g_Profiles.end ())
 			return it->second->IsUnreachable ();
@@ -278,7 +280,7 @@ namespace data
 		g_ProfilesStorage.SetPlace(i2p::fs::GetDataDir());
 		g_ProfilesStorage.Init(i2p::data::GetBase64SubstitutionTable(), 64);
 	}
-
+		
 	static void SaveProfilesToDisk (std::list<std::pair<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > >&& profiles)
 	{
 		for (auto& it: profiles)
@@ -290,7 +292,7 @@ namespace data
 		auto ts = i2p::util::GetSecondsSinceEpoch ();
 		std::list<std::pair<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > > tmp;
 		{
-			std::unique_lock<std::mutex> l(g_ProfilesMutex);
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
 			for (auto it = g_Profiles.begin (); it != g_Profiles.end ();)
 			{
 				if (ts - it->second->GetLastUpdateTime () > PEER_PROFILE_PERSIST_INTERVAL)
@@ -312,7 +314,7 @@ namespace data
 	{
 		std::unordered_map<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > tmp;
 		{
-			std::unique_lock<std::mutex> l(g_ProfilesMutex);
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
 			std::swap (tmp, g_Profiles);
 		}
 		auto ts = i2p::util::GetSecondsSinceEpoch ();
@@ -347,7 +349,7 @@ namespace data
 	{
 		{
 			auto ts = i2p::util::GetSecondsSinceEpoch ();
-			std::unique_lock<std::mutex> l(g_ProfilesMutex);
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
 			for (auto it = g_Profiles.begin (); it != g_Profiles.end ();)
 			{
 				if (ts - it->second->GetLastUpdateTime () >= PEER_PROFILE_EXPIRATION_TIMEOUT)
@@ -359,5 +361,47 @@ namespace data
 
 		return std::async (std::launch::async, DeleteFilesFromDisk);
 	}
+
+	bool UpdateRouterProfile (const IdentHash& identHash, std::function<void (std::shared_ptr<RouterProfile>)> update)
+	{
+		if (!update) return true;
+		std::shared_ptr<RouterProfile> profile;
+		{
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
+			auto it = g_Profiles.find (identHash);
+			if (it != g_Profiles.end ())
+				profile = it->second;
+		}
+		if (profile)
+		{
+			update (profile);
+			return true;
+		}	
+		// postpone
+		std::lock_guard<std::mutex> l(g_PostponedUpdatesMutex);
+		g_PostponedUpdates.emplace_back (identHash, update);
+		return false;
+	}	
+
+	static void ApplyPostponedUpdates (std::list<std::pair<i2p::data::IdentHash, std::function<void (std::shared_ptr<RouterProfile>)> > >&& updates)
+	{
+		for (const auto& [ident, update] : updates)
+		{
+			auto profile = GetRouterProfile (ident);
+			update (profile);
+		}	
+	}	
+		
+	std::future<void> FlushPostponedRouterProfileUpdates ()
+	{
+		if (g_PostponedUpdates.empty ()) return std::future<void>();
+
+		std::list<std::pair<i2p::data::IdentHash, std::function<void (std::shared_ptr<RouterProfile>)> > > updates;
+		{
+			std::lock_guard<std::mutex> l(g_PostponedUpdatesMutex);
+			g_PostponedUpdates.swap (updates);
+		}		
+		return std::async (std::launch::async, ApplyPostponedUpdates, std::move (updates));	
+	}	
 }
 }

libi2pd/Profiling.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,6 +11,7 @@
 
 #include <memory>
 #include <future>
+#include <functional>
 #include <boost/asio.hpp>
 #include "Identity.h"
 
@@ -44,6 +45,8 @@ namespace data
 	const int PEER_PROFILE_UNREACHABLE_INTERVAL = 480; // in seconds (8 minutes)
 	const int PEER_PROFILE_USEFUL_THRESHOLD = 3;
 	const int PEER_PROFILE_ALWAYS_DECLINING_NUM = 5; // num declines in row to consider always declined
+	const int PEER_PROFILE_APPLY_POSTPONED_TIMEOUT = 2100; // in milliseconds	
+	const int PEER_PROFILE_APPLY_POSTPONED_TIMEOUT_VARIANCE = 500; // in milliseconds	
 	
 	class RouterProfile
 	{
@@ -108,6 +111,8 @@ namespace data
 	std::future<void> DeleteObsoleteProfiles ();
 	void SaveProfiles ();
 	std::future<void> PersistProfiles ();
+	bool UpdateRouterProfile (const IdentHash& identHash, std::function<void (std::shared_ptr<RouterProfile>)> update); // return true if updated immediately, and false if postponed
+	std::future<void> FlushPostponedRouterProfileUpdates ();
 }
 }
 

libi2pd/SSU2Session.cpp

@@ -1206,7 +1206,16 @@ namespace transport
 			return false;
 		}
 		if (!m_Address->published)
-			ri->GetProfile ()->SetLastEndpoint (m_RemoteEndpoint);
+		{	
+			if (ri->HasProfile ())	
+				ri->GetProfile ()->SetLastEndpoint (m_RemoteEndpoint);
+			else
+				i2p::data::UpdateRouterProfile (ri->GetIdentHash (), 
+					[ep = m_RemoteEndpoint](std::shared_ptr<i2p::data::RouterProfile> profile)
+				    {
+						if (profile) profile->SetLastEndpoint (ep);
+					});	
+		}	
 		SetRemoteIdentity (ri->GetRouterIdentity ());
 		AdjustMaxPayloadSize ();
 		m_Server.AddSessionByRouterHash (shared_from_this ()); // we know remote router now