* add instance of game_stats for servers, client and server instances are requested by games

* delete ended game_stats sessions after 15 seconds to reduce memory usage

dll/dll/steam_client.h

@@ -154,6 +154,8 @@ public:
     Steam_Networking_Messages *steam_gameserver_networking_messages{};
     Steam_Game_Coordinator *steam_gameserver_game_coordinator{};
     Steam_Masterserver_Updater *steam_masterserver_updater{};
+    Steam_GameStats *steam_gameserver_gamestats{};
+    
     Steam_AppTicket *steam_app_ticket{};
 
     Steam_Overlay* steam_overlay{};

dll/dll/steam_gamestats.h

@@ -26,6 +26,10 @@
 class Steam_GameStats :
 public ISteamGameStats
 {
+private:
+  // how much time to wait before removing ended sessions
+  constexpr const static int MAX_DEAD_SESSION_SECONDS = 15; // TODO not sure what would be sensible in this case
+
   enum class AttributeType_t
   {
     Int, Str, Float, Int64,
@@ -76,13 +80,15 @@ public ISteamGameStats
   class SteamCallBacks *callbacks{};
   class RunEveryRunCB *run_every_runcb{};
   
-	std::vector<Session_t> sessions{};
+  std::map<uint64, Session_t> sessions{};
 
 
+  uint64 create_session_id() const;
   bool valid_stats_account_type(int8 nAccountType);
   Table_t *get_or_create_session_table(Session_t &session, const char *table_name);
   Attribute_t *get_or_create_session_att(const char *att_name, Session_t &session, AttributeType_t type_if_create);
   Attribute_t *get_or_create_row_att(uint64 ulRowID, const char *att_name, Table_t &table, AttributeType_t type_if_create);
+  Session_t* get_last_active_session();
 
   void steam_run_callback();
 
@@ -92,6 +98,7 @@ public ISteamGameStats
   static void steam_gamestats_network_low_level(void *object, Common_Message *msg);
   static void steam_gamestats_run_every_runcb(void *object);
 
+
 public:
   Steam_GameStats(class Settings *settings, class Networking *network, class SteamCallResults *callback_results, class SteamCallBacks *callbacks, class RunEveryRunCB *run_every_runcb);
   ~Steam_GameStats();

dll/steam_client.cpp

@@ -143,6 +143,7 @@ Steam_Client::Steam_Client()
     steam_gameserver_networking_messages = new Steam_Networking_Messages(settings_server, network, callback_results_server, callbacks_server, run_every_runcb);
     steam_gameserver_game_coordinator = new Steam_Game_Coordinator(settings_server, network, callback_results_server, callbacks_server, run_every_runcb);
     steam_masterserver_updater = new Steam_Masterserver_Updater(settings_server, network, callback_results_server, callbacks_server, run_every_runcb);
+    steam_gameserver_gamestats = new Steam_GameStats(settings_server, network, callback_results_server, callbacks_server, run_every_runcb);
 
     PRINT_DEBUG("init AppTicket");
     steam_app_ticket = new Steam_AppTicket(settings_client);

dll/steam_client_interface_getter.cpp

@@ -37,8 +37,16 @@ ISteamGameStats *Steam_Client::GetISteamGameStats( HSteamUser hSteamUser, HSteam
     PRINT_DEBUG("%s", pchVersion);
     if (!steam_pipes.count(hSteamPipe) || !hSteamUser) return nullptr;
 
+    Steam_GameStats *steam_gamestats_tmp{};
+
+    if (steam_pipes[hSteamPipe] == Steam_Pipe::SERVER) {
+        steam_gamestats_tmp = steam_gameserver_gamestats;
+    } else {
+        steam_gamestats_tmp = steam_gamestats;
+    }
+
     if (strcmp(pchVersion, STEAMGAMESTATS_INTERFACE_VERSION) == 0) {
-        return reinterpret_cast<ISteamGameStats *>(static_cast<ISteamGameStats *>(steam_gamestats));
+        return reinterpret_cast<ISteamGameStats *>(static_cast<ISteamGameStats *>(steam_gamestats_tmp));
     }
 
     report_missing_impl_and_exit(pchVersion, EMU_FUNC_NAME);
@@ -249,13 +257,15 @@ ISteamMatchmakingServers *Steam_Client::GetISteamMatchmakingServers( HSteamUser
 // returns the a generic interface
 void *Steam_Client::GetISteamGenericInterface( HSteamUser hSteamUser, HSteamPipe hSteamPipe, const char *pchVersion )
 {
-    PRINT_DEBUG("%s", pchVersion);
+    PRINT_DEBUG("'%s' %i %i", pchVersion, hSteamUser, hSteamPipe);
     if (!steam_pipes.count(hSteamPipe)) return NULL;
 
     bool server = false;
     if (steam_pipes[hSteamPipe] == Steam_Pipe::SERVER) {
+        // PRINT_DEBUG("requesting interface with server pipe");
         server = true;
     } else {
+        // PRINT_DEBUG("requesting interface with client pipe");
         // if this is a user pipe, and version != "SteamNetworkingUtils", and version != "SteamUtils"
         if ((strstr(pchVersion, "SteamNetworkingUtils") != pchVersion) && (strstr(pchVersion, "SteamUtils") != pchVersion)) {
             if (!hSteamUser) return NULL;

dll/steam_gamestats.cpp

@@ -98,18 +98,26 @@ Steam_GameStats::Steam_GameStats(class Settings *settings, class Networking *net
     this->callbacks = callbacks;
     this->run_every_runcb = run_every_runcb;
     
-    this->network->setCallback(CALLBACK_ID_USER_STATUS, settings->get_local_steam_id(), &Steam_GameStats::steam_gamestats_network_low_level, this);
+    // this->network->setCallback(CALLBACK_ID_USER_STATUS, settings->get_local_steam_id(), &Steam_GameStats::steam_gamestats_network_low_level, this);
     this->run_every_runcb->add(&Steam_GameStats::steam_gamestats_run_every_runcb, this);
 
 }
 
 Steam_GameStats::~Steam_GameStats()
 {
-    this->network->rmCallback(CALLBACK_ID_USER_STATUS, settings->get_local_steam_id(), &Steam_GameStats::steam_gamestats_network_low_level, this);
+    // this->network->rmCallback(CALLBACK_ID_USER_STATUS, settings->get_local_steam_id(), &Steam_GameStats::steam_gamestats_network_low_level, this);
     this->run_every_runcb->remove(&Steam_GameStats::steam_gamestats_run_every_runcb, this);
 }
 
 
+uint64 Steam_GameStats::create_session_id() const
+{
+    static uint64 session_id = 0;
+    session_id++;
+    if (!session_id) session_id = 1; // not sure if 0 is a good idea
+    return session_id;
+}
+
 bool Steam_GameStats::valid_stats_account_type(int8 nAccountType)
 {
     switch ((EGameStatsAccountType)nAccountType) {
@@ -128,8 +136,8 @@ Steam_GameStats::Table_t *Steam_GameStats::get_or_create_session_table(Session_t
     {
         auto table_it = std::find_if(session.tables.rbegin(), session.tables.rend(), [=](const std::pair<std::string, Table_t> &item){ return item.first == table_name; });
         if (session.tables.rend() == table_it) {
-            session.tables.emplace_back(std::pair<std::string, Table_t>{});
+            auto& [key, val] = session.tables.emplace_back(std::pair<std::string, Table_t>{});
-            table = &session.tables.back().second;
+            table = &val;
         } else {
             table = &table_it->second;
         }
@@ -151,9 +159,18 @@ Steam_GameStats::Attribute_t *Steam_GameStats::get_or_create_row_att(uint64 ulRo
     return &ele_it->second;
 }
 
+Steam_GameStats::Session_t* Steam_GameStats::get_last_active_session()
+{
+    auto active_session_it = std::find_if(sessions.rbegin(), sessions.rend(), [](std::pair<const uint64, Steam_GameStats::Session_t> item){ return !item.second.ended; });
+    if (sessions.rend() == active_session_it) return nullptr; // TODO is this correct?
+
+    return &active_session_it->second;
+}
+
 
 SteamAPICall_t Steam_GameStats::GetNewSession( int8 nAccountType, uint64 ulAccountID, int32 nAppID, RTime32 rtTimeStarted )
 {
+    // appid 550 calls this function once with client account id, and another time with server account id
     PRINT_DEBUG("%i, %llu, %i, %u", (int)nAccountType, ulAccountID, nAppID, rtTimeStarted);
     std::lock_guard lock(global_mutex);
 
@@ -161,11 +178,13 @@ SteamAPICall_t Steam_GameStats::GetNewSession( int8 nAccountType, uint64 ulAccou
         (nAppID < 0) ||
         (settings->get_local_game_id().AppID() != (uint32)nAppID) ||
         !valid_stats_account_type(nAccountType)) {
+
         GameStatsSessionIssued_t data_invalid{};
         data_invalid.m_bCollectingAny = false;
         data_invalid.m_bCollectingDetails = false;
         data_invalid.m_eResult = EResult::k_EResultInvalidParam;
         data_invalid.m_ulSessionID = 0;
+        PRINT_DEBUG("[X] invalid param");
 
         auto ret = callback_results->addCallResult(data_invalid.k_iCallback, &data_invalid, sizeof(data_invalid));
         // the function returns SteamAPICall_t (call result), but in isteamstats.h you can see that a callback is also expected
@@ -173,16 +192,18 @@ SteamAPICall_t Steam_GameStats::GetNewSession( int8 nAccountType, uint64 ulAccou
         return ret;
     }
 
+    auto session_id = create_session_id();
     Session_t new_session{};
     new_session.nAccountType = (EGameStatsAccountType)nAccountType;
     new_session.rtTimeStarted = rtTimeStarted;
-    sessions.emplace_back(new_session);
+    sessions.insert_or_assign(session_id, new_session);
 
     GameStatsSessionIssued_t data{};
     data.m_bCollectingAny = true; // TODO is this correct?
     data.m_bCollectingDetails = true; // TODO is this correct?
     data.m_eResult = EResult::k_EResultOK;
-    data.m_ulSessionID = (uint64)sessions.size(); // I don't know if 0 is a bad value, so always send count (index + 1)
+    data.m_ulSessionID = session_id;
+    PRINT_DEBUG("new session id = %llu", session_id);
     
     auto ret = callback_results->addCallResult(data.k_iCallback, &data, sizeof(data));
     // the function returns SteamAPICall_t (call result), but in isteamstats.h you can see that a callback is also expected
@@ -195,10 +216,12 @@ SteamAPICall_t Steam_GameStats::EndSession( uint64 ulSessionID, RTime32 rtTimeEn
     PRINT_DEBUG("%llu, %u, %i", ulSessionID, rtTimeEnded, nReasonCode);
     std::lock_guard lock(global_mutex);
 
-    if (ulSessionID == 0 || ulSessionID > sessions.size()) {
+    auto session_it = sessions.find(ulSessionID);
+    if (sessions.end() == session_it) {
         GameStatsSessionClosed_t data_invalid{};
         data_invalid.m_eResult = EResult::k_EResultInvalidParam;
         data_invalid.m_ulSessionID = ulSessionID;
+        PRINT_DEBUG("[X] session doesn't exist");
 
         auto ret = callback_results->addCallResult(data_invalid.k_iCallback, &data_invalid, sizeof(data_invalid));
         // the function returns SteamAPICall_t (call result), but in isteamstats.h you can see that a callback is also expected
@@ -206,7 +229,7 @@ SteamAPICall_t Steam_GameStats::EndSession( uint64 ulSessionID, RTime32 rtTimeEn
         return ret;
     }
 
-    auto& session = sessions[static_cast<unsigned>(ulSessionID - 1)];
+    auto& session = session_it->second;
     if (session.ended) {
         GameStatsSessionClosed_t data_invalid{};
         data_invalid.m_eResult = EResult::k_EResultExpired; // TODO is this correct?
@@ -225,6 +248,7 @@ SteamAPICall_t Steam_GameStats::EndSession( uint64 ulSessionID, RTime32 rtTimeEn
     GameStatsSessionClosed_t data{};
     data.m_eResult = EResult::k_EResultOK;
     data.m_ulSessionID = ulSessionID;
+    PRINT_DEBUG("ended session");
 
     auto ret = callback_results->addCallResult(data.k_iCallback, &data, sizeof(data));
     // the function returns SteamAPICall_t (call result), but in isteamstats.h you can see that a callback is also expected
@@ -234,69 +258,77 @@ SteamAPICall_t Steam_GameStats::EndSession( uint64 ulSessionID, RTime32 rtTimeEn
 
 EResult Steam_GameStats::AddSessionAttributeInt( uint64 ulSessionID, const char* pstrName, int32 nData )
 {
-    PRINT_DEBUG("%llu, '%s', %i", ulSessionID, pstrName, nData);
+    PRINT_DEBUG("%llu, '%s'=%i", ulSessionID, pstrName, nData);
     std::lock_guard lock(global_mutex);
 
-    if (ulSessionID == 0 || ulSessionID > sessions.size() || !pstrName) return EResult::k_EResultInvalidParam; // TODO is this correct?
+    auto session_it = sessions.find(ulSessionID);
+    if (sessions.end() == session_it) return EResult::k_EResultInvalidParam; // TODO is this correct?
     
-    auto& session = sessions[static_cast<unsigned>(ulSessionID - 1)];
+    auto& session = session_it->second;
     if (session.ended) return EResult::k_EResultExpired; // TODO is this correct?
 
     auto att = get_or_create_session_att(pstrName, session, AttributeType_t::Int);
     if (att->type != AttributeType_t::Int) return EResult::k_EResultFail; // TODO is this correct?
 
     att->n_data = nData;
+    PRINT_DEBUG("added successfully");
     return EResult::k_EResultOK;
 }
 
 EResult Steam_GameStats::AddSessionAttributeString( uint64 ulSessionID, const char* pstrName, const char *pstrData )
 {
-    PRINT_DEBUG("%llu, '%s', '%s'", ulSessionID, pstrName, pstrData);
+    PRINT_DEBUG("%llu, '%s'='%s'", ulSessionID, pstrName, pstrData);
     std::lock_guard lock(global_mutex);
 
-    if (ulSessionID == 0 || ulSessionID > sessions.size() || !pstrName || !pstrData) return EResult::k_EResultInvalidParam; // TODO is this correct?
+    auto session_it = sessions.find(ulSessionID);
+    if (sessions.end() == session_it) return EResult::k_EResultInvalidParam; // TODO is this correct?
     
-    auto& session = sessions[static_cast<unsigned>(ulSessionID - 1)];
+    auto& session = session_it->second;
     if (session.ended) return EResult::k_EResultExpired; // TODO is this correct?
 
     auto att = get_or_create_session_att(pstrName, session, AttributeType_t::Str);
     if (att->type != AttributeType_t::Str) return EResult::k_EResultFail; // TODO is this correct?
     
     att->s_data = pstrData;
+    PRINT_DEBUG("added successfully");
     return EResult::k_EResultOK;
 }
 
 EResult Steam_GameStats::AddSessionAttributeFloat( uint64 ulSessionID, const char* pstrName, float fData )
 {
-    PRINT_DEBUG("%llu, '%s', %f", ulSessionID, pstrName, fData);
+    PRINT_DEBUG("%llu, '%s'=%f", ulSessionID, pstrName, fData);
     std::lock_guard lock(global_mutex);
 
-    if (ulSessionID == 0 || ulSessionID > sessions.size() || !pstrName) return EResult::k_EResultInvalidParam; // TODO is this correct?
+    auto session_it = sessions.find(ulSessionID);
+    if (sessions.end() == session_it) return EResult::k_EResultInvalidParam; // TODO is this correct?
     
-    auto& session = sessions[static_cast<unsigned>(ulSessionID - 1)];
+    auto& session = session_it->second;
     if (session.ended) return EResult::k_EResultExpired; // TODO is this correct?
 
     auto att = get_or_create_session_att(pstrName, session, AttributeType_t::Float);
     if (att->type != AttributeType_t::Float) return EResult::k_EResultFail; // TODO is this correct?
 
     att->f_data = fData;
+    PRINT_DEBUG("added successfully");
     return EResult::k_EResultOK;
 }
 
 
 EResult Steam_GameStats::AddNewRow( uint64 *pulRowID, uint64 ulSessionID, const char *pstrTableName )
 {
-    PRINT_DEBUG("%p, %llu, '%s'", pulRowID, ulSessionID, pstrTableName);
+    PRINT_DEBUG("%p, %llu, ['%s']", pulRowID, ulSessionID, pstrTableName);
     std::lock_guard lock(global_mutex);
 
-    if (ulSessionID == 0 || ulSessionID > sessions.size() || !pstrTableName) return EResult::k_EResultInvalidParam; // TODO is this correct?
+    auto session_it = sessions.find(ulSessionID);
+    if (sessions.end() == session_it) return EResult::k_EResultInvalidParam; // TODO is this correct?
     
-    auto& session = sessions[static_cast<unsigned>(ulSessionID - 1)];
+    auto& session = session_it->second;
     if (session.ended) return EResult::k_EResultExpired; // TODO is this correct?
 
     auto table = get_or_create_session_table(session, pstrTableName);
     table->rows.emplace_back(Row_t{});
     if (pulRowID) *pulRowID = (uint64)(table->rows.size() - 1);
+    PRINT_DEBUG("added successfully");
     return EResult::k_EResultOK;
 }
 
@@ -305,8 +337,8 @@ EResult Steam_GameStats::CommitRow( uint64 ulRowID )
     PRINT_DEBUG("%llu", ulRowID);
     std::lock_guard lock(global_mutex);
     
-    auto active_session = std::find_if(sessions.rbegin(), sessions.rend(), [](const Session_t &item){ return !item.ended; });
+    auto active_session = get_last_active_session();
-    if (sessions.rend() == active_session) return EResult::k_EResultFail; // TODO is this correct?
+    if (!active_session) return EResult::k_EResultFail; // TODO is this correct?
     if (active_session->tables.empty()) return EResult::k_EResultFail; // TODO is this correct?
 
     auto &table = active_session->tables.back().second;
@@ -316,6 +348,7 @@ EResult Steam_GameStats::CommitRow( uint64 ulRowID )
     auto& row = table.rows[static_cast<unsigned>(ulRowID)];
     row.committed = true;
     
+    PRINT_DEBUG("committed successfully");
     return EResult::k_EResultOK;
 }
 
@@ -324,9 +357,10 @@ EResult Steam_GameStats::CommitOutstandingRows( uint64 ulSessionID )
     PRINT_DEBUG("%llu", ulSessionID);
     std::lock_guard lock(global_mutex);
     
-    if (ulSessionID == 0 || ulSessionID > sessions.size()) return EResult::k_EResultInvalidParam; // TODO is this correct?
+    auto session_it = sessions.find(ulSessionID);
+    if (sessions.end() == session_it) return EResult::k_EResultInvalidParam; // TODO is this correct?
     
-    auto& session = sessions[static_cast<unsigned>(ulSessionID - 1)];
+    auto& session = session_it->second;
     if (session.ended) return EResult::k_EResultExpired; // TODO is this correct?
 
     if (session.tables.size()) {
@@ -334,18 +368,19 @@ EResult Steam_GameStats::CommitOutstandingRows( uint64 ulSessionID )
             row.committed = true;
         }
     }
+    PRINT_DEBUG("committed all successfully");
     return EResult::k_EResultOK;
 }
 
 EResult Steam_GameStats::AddRowAttributeInt( uint64 ulRowID, const char *pstrName, int32 nData )
 {
-    PRINT_DEBUG("%llu, '%s', %i", ulRowID, pstrName, nData);
+    PRINT_DEBUG("%llu, '%s'=%i", ulRowID, pstrName, nData);
     std::lock_guard lock(global_mutex);
     
     if (!pstrName) return EResult::k_EResultInvalidParam; // TODO is this correct?
     
-    auto active_session = std::find_if(sessions.rbegin(), sessions.rend(), [](const Session_t &item){ return !item.ended; });
+    auto active_session = get_last_active_session();
-    if (sessions.rend() == active_session) return EResult::k_EResultFail; // TODO is this correct?
+    if (!active_session) return EResult::k_EResultFail; // TODO is this correct?
     if (active_session->tables.empty()) return EResult::k_EResultFail; // TODO is this correct?
 
     auto &table = active_session->tables.back().second;
@@ -355,18 +390,20 @@ EResult Steam_GameStats::AddRowAttributeInt( uint64 ulRowID, const char *pstrNam
     if (att->type != AttributeType_t::Int) return EResult::k_EResultFail; // TODO is this correct?
 
     att->n_data = nData;
+    PRINT_DEBUG("added successfully");
     return EResult::k_EResultOK;
 }
 
 EResult Steam_GameStats::AddRowAtributeString( uint64 ulRowID, const char *pstrName, const char *pstrData )
 {
-    PRINT_DEBUG("%llu, '%s', '%s'", ulRowID, pstrName, pstrData);
+    PRINT_DEBUG("%llu, '%s'='%s'", ulRowID, pstrName, pstrData);
     std::lock_guard lock(global_mutex);
     
     if (!pstrName || !pstrData) return EResult::k_EResultInvalidParam; // TODO is this correct?
     
-    auto active_session = std::find_if(sessions.rbegin(), sessions.rend(), [](const Session_t &item){ return !item.ended; });
+    auto active_session = get_last_active_session();
-    if (sessions.rend() == active_session) return EResult::k_EResultFail; // TODO is this correct?
+    if (!active_session) return EResult::k_EResultFail; // TODO is this correct?
+    if (active_session->tables.empty()) return EResult::k_EResultFail; // TODO is this correct?
 
     auto &table = active_session->tables.back().second;
     if (ulRowID >= table.rows.size()) return EResult::k_EResultInvalidParam; // TODO is this correct?
@@ -375,18 +412,20 @@ EResult Steam_GameStats::AddRowAtributeString( uint64 ulRowID, const char *pstrN
     if (att->type != AttributeType_t::Str) return EResult::k_EResultFail; // TODO is this correct?
 
     att->s_data = pstrData;
+    PRINT_DEBUG("added successfully");
     return EResult::k_EResultOK;
 }
 
 EResult Steam_GameStats::AddRowAttributeFloat( uint64 ulRowID, const char *pstrName, float fData )
 {
-    PRINT_DEBUG("%llu, '%s', %f", ulRowID, pstrName, fData);
+    PRINT_DEBUG("%llu, '%s'=%f", ulRowID, pstrName, fData);
     std::lock_guard lock(global_mutex);
     
     if (!pstrName) return EResult::k_EResultInvalidParam; // TODO is this correct?
     
-    auto active_session = std::find_if(sessions.rbegin(), sessions.rend(), [](const Session_t &item){ return !item.ended; });
+    auto active_session = get_last_active_session();
-    if (sessions.rend() == active_session) return EResult::k_EResultFail; // TODO is this correct?
+    if (!active_session) return EResult::k_EResultFail; // TODO is this correct?
+    if (active_session->tables.empty()) return EResult::k_EResultFail; // TODO is this correct?
 
     auto &table = active_session->tables.back().second;
     if (ulRowID >= table.rows.size()) return EResult::k_EResultInvalidParam; // TODO is this correct?
@@ -395,36 +434,40 @@ EResult Steam_GameStats::AddRowAttributeFloat( uint64 ulRowID, const char *pstrN
     if (att->type != AttributeType_t::Float) return EResult::k_EResultFail; // TODO is this correct?
 
     att->f_data = fData;
+    PRINT_DEBUG("added successfully");
     return EResult::k_EResultOK;
 }
 
 
 EResult Steam_GameStats::AddSessionAttributeInt64( uint64 ulSessionID, const char *pstrName, int64 llData )
 {
-    PRINT_DEBUG("%llu, '%s', %lli", ulSessionID, pstrName, llData);
+    PRINT_DEBUG("%llu, '%s'=%lli", ulSessionID, pstrName, llData);
     std::lock_guard lock(global_mutex);
 
-    if (ulSessionID == 0 || ulSessionID > sessions.size() || !pstrName) return EResult::k_EResultInvalidParam; // TODO is this correct?
+    auto session_it = sessions.find(ulSessionID);
+    if (sessions.end() == session_it) return EResult::k_EResultInvalidParam; // TODO is this correct?
     
-    auto& session = sessions[static_cast<unsigned>(ulSessionID - 1)];
+    auto& session = session_it->second;
     if (session.ended) return EResult::k_EResultExpired; // TODO is this correct?
 
     auto att = get_or_create_session_att(pstrName, session, AttributeType_t::Int64);
     if (att->type != AttributeType_t::Int64) return EResult::k_EResultFail; // TODO is this correct?
 
     att->ll_data = llData;
+    PRINT_DEBUG("added successfully");
     return EResult::k_EResultOK;
 }
 
 EResult Steam_GameStats::AddRowAttributeInt64( uint64 ulRowID, const char *pstrName, int64 llData )
 {
-    PRINT_DEBUG("%llu, '%s', %lli", ulRowID, pstrName, llData);
+    PRINT_DEBUG("%llu, '%s'=%lli", ulRowID, pstrName, llData);
     std::lock_guard lock(global_mutex);
     
     if (!pstrName) return EResult::k_EResultInvalidParam; // TODO is this correct?
     
-    auto active_session = std::find_if(sessions.rbegin(), sessions.rend(), [](const Session_t &item){ return !item.ended; });
+    auto active_session = get_last_active_session();
-    if (sessions.rend() == active_session) return EResult::k_EResultFail; // TODO is this correct?
+    if (!active_session) return EResult::k_EResultFail; // TODO is this correct?
+    if (active_session->tables.empty()) return EResult::k_EResultFail; // TODO is this correct?
 
     auto &table = active_session->tables.back().second;
     if (ulRowID >= table.rows.size()) return EResult::k_EResultInvalidParam; // TODO is this correct?
@@ -433,6 +476,7 @@ EResult Steam_GameStats::AddRowAttributeInt64( uint64 ulRowID, const char *pstrN
     if (att->type != AttributeType_t::Int64) return EResult::k_EResultFail; // TODO is this correct?
 
     att->ll_data = llData;
+    PRINT_DEBUG("added successfully");
     return EResult::k_EResultOK;
 }
 
@@ -442,7 +486,28 @@ EResult Steam_GameStats::AddRowAttributeInt64( uint64 ulRowID, const char *pstrN
 
 void Steam_GameStats::steam_run_callback()
 {
-    // nothing
+    // remove ended sessions that are inactive
+    auto session_it = sessions.begin();
+    auto now_epoch_sec = std::chrono::duration_cast<std::chrono::seconds>(
+        std::chrono::system_clock::now().time_since_epoch()
+    );
+    while (sessions.end() != session_it) {
+        bool should_remove = false;
+
+        auto &session = session_it->second;
+        if (session.ended) {
+            if ( (now_epoch_sec.count() - (long long)session.rtTimeEnded) >= MAX_DEAD_SESSION_SECONDS ) {
+                should_remove = true;
+                PRINT_DEBUG("removing outdated session id=%llu", session_it->first);
+            }
+        }
+
+        if (should_remove) {
+            session_it = sessions.erase(session_it);
+        } else {
+            ++session_it;
+        }
+    }
 }