* implemented the missing interface ISteamGameServerStats, allowing game servers to exchange user stats with players

* add rmCallback() to networking
* refactor gameserver_stats into a separate .cpp file

CHANGELOG.md

@@ -4,14 +4,16 @@
   - the above command introduced the ability to run without root
   - if the script was ran without root, and `-packages_skip` wasn't specified,  
     the script will attempt to detect and use the built-in tool `sudo` if it was available
+* implemented the missing interface `ISteamGameServerStats`, allowing game servers to exchange user stats with players
 * for windows: updated stub drm patterns and added a workaround for older variants,  
   this increases the compatibility, but makes it easier to be detected
 * new stub dll `GameOverlayRenderer` for the experiemntal steamclient setup,  
   some apps verify the existence of this dll, either on disk, or inside their memory space.  
-  not recommended to ignore it
-* allow overlay invitations to obscure game input to be able to accept/reject the request
+  **not recommended** to ignore it
+* added new function `rmCallbacks()` for the networking, to be able to cleanup callbacks on object destruction
 * added missing example file `disable_lobby_creation.txt` in `steam_settings` folder + updated release `README`
 * for windows build script: prevent permissive language extensions via the compiler flag `/permissive-`
+* allow overlay invitations to obscure game input to be able to accept/reject the request
 
 ---
 

dll/dll/network.h

@@ -62,12 +62,13 @@ enum Callback_Ids {
     CALLBACK_ID_NETWORKING_SOCKETS,
     CALLBACK_ID_STEAM_MESSAGES,
     CALLBACK_ID_NETWORKING_MESSAGES,
+    CALLBACK_ID_GAMESERVER_STATS,
 
     CALLBACK_IDS_MAX
 };
 
 struct Network_Callback_Container {
-    std::vector<struct Network_Callback> callbacks;
+    std::vector<struct Network_Callback> callbacks{};
 };
 
 struct TCP_Socket {
@@ -131,12 +132,23 @@ public:
     void addListenId(CSteamID id);
     void setAppID(uint32 appid);
     void Run();
+
+    // send to a specific user, if 0 was passed to set_dest_id() then this will be broadcasted to all users on the network
     bool sendTo(Common_Message *msg, bool reliable, Connection *conn = NULL);
+    
+    // send to all users whose account type is Individual, no need to call set_dest_id(), this is done automatically 
     bool sendToAllIndividuals(Common_Message *msg, bool reliable);
+
+    // send to all active/current connections, no need to call set_dest_id(), this is done automatically
     bool sendToAll(Common_Message *msg, bool reliable);
+    
+    // send to active/current connections with specific ip/port, no need to call set_dest_id(), this is done automatically
+    //TODO: actually send to ip/port
     bool sendToIPPort(Common_Message *msg, uint32 ip, uint16 port, bool reliable);
 
     bool setCallback(Callback_Ids id, CSteamID steam_id, void (*message_callback)(void *object, Common_Message *msg), void *object);
+    void rmCallback(Callback_Ids id, CSteamID steam_id, void (*message_callback)(void *object, Common_Message *msg), void *object);
+
     uint32 getIP(CSteamID id);
     uint32 getOwnIP();
 

dll/dll/settings.h

@@ -78,14 +78,8 @@ struct Leaderboard_config {
     enum ELeaderboardDisplayType display_type;
 };
 
-enum Stat_Type {
-    STAT_TYPE_INT,
-    STAT_TYPE_FLOAT,
-    STAT_TYPE_AVGRATE
-};
-
 struct Stat_config {
-    enum Stat_Type type;
+    GameServerStats_Messages::StatInfo::Stat_Type type;
     union {
         float default_value_float;
         int32 default_value_int;

dll/dll/steam_gameserverstats.h

@@ -26,8 +26,52 @@ class Steam_GameServerStats : public ISteamGameServerStats
     class Networking *network;
     class SteamCallResults *callback_results;
     class SteamCallBacks *callbacks;
+    class RunEveryRunCB *run_every_runcb;
+	
+	struct RequestAllStats {
+		std::chrono::high_resolution_clock::time_point created{};
+		SteamAPICall_t steamAPICall{};
+		CSteamID steamIDUser{};
+
+		bool timeout = false;
+	};
+
+	struct CachedStat {
+		bool dirty = false; // true means it was changed on the server and should be sent to the user
+		GameServerStats_Messages::StatInfo stat{};
+	};
+	struct CachedAchievement {
+		bool dirty = false; // true means it was changed on the server and should be sent to the user
+		GameServerStats_Messages::AchievementInfo ach{};
+	};
+
+	struct UserData {
+		std::map<std::string, CachedStat> stats{};
+		std::map<std::string, CachedAchievement> achievements{};
+	};
+
+	std::vector<RequestAllStats> pending_RequestUserStats{};
+	std::map<uint64, UserData> all_users_data{};
+
+	CachedStat* find_stat(CSteamID steamIDUser, const std::string &key);
+	CachedAchievement* find_ach(CSteamID steamIDUser, const std::string &key);
+
+	void remove_timedout_userstats_requests();
+	void collect_and_send_updated_user_stats();
+	void steam_run_callback();
+
+	// reponses from player
+	void network_callback_initial_stats(Common_Message *msg);
+	void network_callback_updated_stats(Common_Message *msg);
+	void network_callback(Common_Message *msg);
+
+	static void steam_gameserverstats_network_callback(void *object, Common_Message *msg);
+	static void steam_gameserverstats_run_every_runcb(void *object);
+
 public:
-	Steam_GameServerStats(class Settings *settings, class Networking *network, class SteamCallResults *callback_results, class SteamCallBacks *callbacks);
+	Steam_GameServerStats(class Settings *settings, class Networking *network, class SteamCallResults *callback_results, class SteamCallBacks *callbacks, class RunEveryRunCB *run_every_runcb);
+	~Steam_GameServerStats();
+	
 	// downloads stats for the user
 	// returns a GSStatsReceived_t callback when completed
 	// if the user has no stats, GSStatsReceived_t.m_eResult will be set to k_EResultFail

dll/net.proto

@@ -215,6 +215,59 @@ message Steam_Messages {
 	}
 }
 
+message GameServerStats_Messages {
+    // --- baisc definitions
+    message StatInfo {
+        enum Stat_Type {
+            STAT_TYPE_INT = 0;
+            STAT_TYPE_FLOAT = 1;
+            STAT_TYPE_AVGRATE = 2;
+        }
+        message AvgStatInfo {
+            float count_this_session = 1;
+            double session_length = 2;
+        }
+
+        Stat_Type stat_type = 1;
+        oneof stat_value {
+            float value_float = 2;
+            int32 value_int = 3;
+        }
+        optional AvgStatInfo value_avg = 4; // only set when type != INT
+    }
+    message AchievementInfo {
+        bool achieved = 1;
+    }
+
+    // --- requests & responses objects
+    // this is used when updating stats, from server or user, bi-directional
+    message AllStats {
+        map<string, StatInfo> user_stats = 1;
+        map<string, AchievementInfo> user_achievements = 2;
+    }
+    // sent from server as a request, response sent by the user
+    message InitialAllStats {
+        uint64 steam_api_call = 1;
+        
+        // optional because the server send doesn't send any data, just steam api call id
+        optional AllStats all_data = 2;
+    }
+    // Request_: from Steam_GameServerStats
+    // Response_: from Steam_User_Stats
+    enum Types {
+        Request_AllUserStats = 0;
+        Response_AllUserStats = 1;
+
+        UpdateUserStats = 2; // sent by both sides
+    }
+
+	Types type = 1;
+    oneof data_messages {
+        InitialAllStats initial_user_stats = 2;
+        AllStats update_user_stats = 3;
+    }
+}
+
 message Common_Message {
     uint64 source_id = 1; // SteamID64 of the sender
     uint64 dest_id = 2; // SteamID64 of the target receiver
@@ -232,6 +285,7 @@ message Common_Message {
         Networking_Sockets networking_sockets = 13;
         Steam_Messages steam_messages = 14;
         Networking_Messages networking_messages = 15;
+        GameServerStats_Messages gameserver_stats_messages = 16;
     }
 
     uint32 source_ip = 128;

dll/network.cpp

@@ -584,6 +584,12 @@ void Networking::do_callbacks_message(Common_Message *msg)
         PRINT_DEBUG("Networking has_networking_messages\n");
         run_callbacks(CALLBACK_ID_NETWORKING_MESSAGES, msg);
     }
+
+    if (msg->has_gameserver_stats_messages()) {
+        PRINT_DEBUG("Networking has_gameserver_stats\n");
+        run_callbacks(CALLBACK_ID_GAMESERVER_STATS, msg);
+    }
+    
 }
 
 bool Networking::handle_tcp(Common_Message *msg, struct TCP_Socket &socket)
@@ -1181,7 +1187,7 @@ bool Networking::sendToIPPort(Common_Message *msg, uint32 ip, uint16 port, bool
 {
     bool is_local_ip = ((ip >> 24) == 0x7F);
     uint32_t local_ip = getIP(ids.front());
-    PRINT_DEBUG("sendToIPPort %X %u %X\n", ip, is_local_ip, local_ip);
+    PRINT_DEBUG("Networking::sendToIPPort %X %u %X\n", ip, is_local_ip, local_ip);
     //TODO: actually send to ip/port
     for (auto &conn: connections) {
         if (ntohl(conn.tcp_ip_port.ip) == ip || (is_local_ip && ntohl(conn.tcp_ip_port.ip) == local_ip)) {
@@ -1215,9 +1221,9 @@ bool Networking::sendTo(Common_Message *msg, bool reliable, Connection *conn)
     bool ret = false;
     CSteamID dest_id((uint64)msg->dest_id());
     if (std::find(ids.begin(), ids.end(), dest_id) != ids.end()) {
-        PRINT_DEBUG("Sending to self\n");
+        PRINT_DEBUG("Networking sending to self\n");
         if (!conn) {
-            PRINT_DEBUG("local send\n");
+            PRINT_DEBUG("Networking local send\n");
             local_send.push_back(*msg);
             ret = true;
         }
@@ -1278,7 +1284,11 @@ bool Networking::sendToAll(Common_Message *msg, bool reliable)
 void Networking::run_callbacks(Callback_Ids id, Common_Message *msg)
 {
     for (auto &cb : callbacks[id].callbacks) {
-        if (cb.steam_id.ConvertToUint64() == 0 || msg->dest_id() == 0 || cb.steam_id.ConvertToUint64() == msg->dest_id()) {
+        uint64 callback_allowed_steamid = cb.steam_id.ConvertToUint64();
+        uint64 message_destination_steamid = msg->dest_id();
+        if (callback_allowed_steamid == 0 || // callback wants to receive all messages (callback for broadcast)
+            message_destination_steamid == 0 || // message was broadcasted to all (broadcast message)
+            callback_allowed_steamid == message_destination_steamid) { // callback destination is the same as the message destination
             cb.message_callback(cb.object, msg);
         }
     }
@@ -1305,7 +1315,7 @@ bool Networking::setCallback(Callback_Ids id, CSteamID steam_id, void (*message_
 {
     if (id >= CALLBACK_IDS_MAX) return false;
 
-    struct Network_Callback nc;
+    struct Network_Callback nc{};
     nc.message_callback = message_callback;
     nc.object = object;
     nc.steam_id = steam_id;
@@ -1314,6 +1324,24 @@ bool Networking::setCallback(Callback_Ids id, CSteamID steam_id, void (*message_
     return true;
 }
 
+void Networking::rmCallback(Callback_Ids id, CSteamID steam_id, void (*message_callback)(void *object, Common_Message *msg), void *object)
+{
+    if (id >= CALLBACK_IDS_MAX) return;
+
+    auto &target_cb = callbacks[id].callbacks;
+    auto itrm = std::remove_if(
+        target_cb.begin(),
+        target_cb.end(),
+        [=, &steam_id](const struct Network_Callback &item) {
+            return item.message_callback == message_callback &&
+                   item.object == object &&
+                   item.steam_id == steam_id;
+        }
+    );
+
+    target_cb.erase(itrm, target_cb.end());
+}
+
 uint32 Networking::getOwnIP()
 {
     return own_ip;

dll/settings_parser.cpp

@@ -666,13 +666,13 @@ static void parse_stats(class Settings *settings_client, Settings *settings_serv
 
             try {
                 if (stat_type == "float") {
-                    config.type = Stat_Type::STAT_TYPE_FLOAT;
+                    config.type = GameServerStats_Messages::StatInfo::STAT_TYPE_FLOAT;
                     config.default_value_float = std::stof(stat_default_value);
                 } else if (stat_type == "int") {
-                    config.type = Stat_Type::STAT_TYPE_INT;
+                    config.type = GameServerStats_Messages::StatInfo::STAT_TYPE_INT;
                     config.default_value_int = std::stol(stat_default_value);
                 } else if (stat_type == "avgrate") {
-                    config.type = Stat_Type::STAT_TYPE_AVGRATE;
+                    config.type = GameServerStats_Messages::StatInfo::STAT_TYPE_AVGRATE;
                     config.default_value_float = std::stof(stat_default_value);
                 } else {
                     PRINT_DEBUG("Error adding stat %s, type %s isn't valid\n", stat_name.c_str(), stat_type.c_str());

dll/steam_client.cpp

@@ -81,7 +81,7 @@ Steam_Client::Steam_Client()
 
     steam_matchmaking = new Steam_Matchmaking(settings_client, network, callback_results_client, callbacks_client, run_every_runcb);
     steam_matchmaking_servers = new Steam_Matchmaking_Servers(settings_client, network);
-    steam_user_stats = new Steam_User_Stats(settings_client, local_storage, callback_results_client, callbacks_client, steam_overlay);
+    steam_user_stats = new Steam_User_Stats(settings_client, network, local_storage, callback_results_client, callbacks_client, run_every_runcb, steam_overlay);
     steam_apps = new Steam_Apps(settings_client, callback_results_client);
     steam_networking = new Steam_Networking(settings_client, network, callbacks_client, run_every_runcb);
     steam_remote_storage = new Steam_Remote_Storage(settings_client, ugc_bridge, local_storage, callback_results_client);
@@ -110,7 +110,7 @@ Steam_Client::Steam_Client()
     PRINT_DEBUG("client init gameserver\n");
     steam_gameserver = new Steam_GameServer(settings_server, network, callbacks_server);
     steam_gameserver_utils = new Steam_Utils(settings_server, callback_results_server, steam_overlay);
-    steam_gameserverstats = new Steam_GameServerStats(settings_server, network, callback_results_server, callbacks_server);
+    steam_gameserverstats = new Steam_GameServerStats(settings_server, network, callback_results_server, callbacks_server, run_every_runcb);
     steam_gameserver_networking = new Steam_Networking(settings_server, network, callbacks_server, run_every_runcb);
     steam_gameserver_http = new Steam_HTTP(settings_server, network, callback_results_server, callbacks_server);
     steam_gameserver_inventory = new Steam_Inventory(settings_server, callback_results_server, callbacks_server, run_every_runcb, local_storage);
@@ -128,7 +128,7 @@ Steam_Client::Steam_Client()
     gameserver_has_ipv6_functions = false;
 
     last_cb_run = 0;
-    PRINT_DEBUG("Steam_Client init end ----------\n");
+    PRINT_DEBUG("Steam_Client init end *********\n");
 }
 
 Steam_Client::~Steam_Client()
@@ -1914,7 +1914,7 @@ void Steam_Client::RunCallbacks(bool runClientCB, bool runGameserverCB, bool run
     callbacks_client->runCallBacks();
 
     last_cb_run = std::chrono::duration_cast<std::chrono::duration<unsigned long long>>(std::chrono::system_clock::now().time_since_epoch()).count();
-    PRINT_DEBUG("Steam_Client::RunCallbacks done ------------------------------------------------------\n");
+    PRINT_DEBUG("Steam_Client::RunCallbacks done ******************************************************\n");
 }
 
 void Steam_Client::DestroyAllInterfaces()

dll/steam_gameserver.cpp

@@ -56,8 +56,12 @@ bool Steam_GameServer::InitGameServer( uint32 unIP, uint16 usGamePort, uint16 us
     std::string version(pchVersionString);
     version.erase(std::remove(version.begin(), version.end(), ' '), version.end());
     version.erase(std::remove(version.begin(), version.end(), '.'), version.end());
+    PRINT_DEBUG("Steam_GameServer::InitGameServer version trimmed '%s'\n", version.c_str());
+
     try {
-        server_data.set_version(std::stoi(version));
+        auto ver = std::stoul(version);
+        server_data.set_version(ver);
+        PRINT_DEBUG("Steam_GameServer::InitGameServer set version to %lu\n", ver);
     } catch (...) {
         PRINT_DEBUG("Steam_GameServer::InitGameServer: not a number: %s\n", pchVersionString);
         server_data.set_version(0);

dll/steam_gameserverstats.cpp

@@ -17,14 +17,90 @@
 
 #include "dll/steam_gameserverstats.h"
 
-Steam_GameServerStats::Steam_GameServerStats(class Settings *settings, class Networking *network, class SteamCallResults *callback_results, class SteamCallBacks *callbacks)
+// TODO not sure what's the real value
+#define PENDING_RequestUserStats_TIMEOUT 7.0
+
+
+void Steam_GameServerStats::steam_gameserverstats_network_callback(void *object, Common_Message *msg)
+{
+    // PRINT_DEBUG("Steam_GameServerStats::steam_gameserverstats_network_callback\n");
+
+    auto steam_gameserverstats = (Steam_GameServerStats *)object;
+    steam_gameserverstats->network_callback(msg);
+}
+
+void Steam_GameServerStats::steam_gameserverstats_run_every_runcb(void *object)
+{
+    // PRINT_DEBUG("Steam_GameServerStats::steam_gameserverstats_run_every_runcb\n");
+
+    auto steam_gameserverstats = (Steam_GameServerStats *)object;
+    steam_gameserverstats->steam_run_callback();
+}
+
+Steam_GameServerStats::CachedStat* Steam_GameServerStats::find_stat(CSteamID steamIDUser, const std::string &key)
+{
+    auto it_data = all_users_data.find(steamIDUser.ConvertToUint64());
+    if (all_users_data.end() == it_data) return {}; // no user
+
+    auto it_stat = std::find_if(
+        it_data->second.stats.begin(), it_data->second.stats.end(),
+        [&key](std::pair<const std::string, CachedStat> &item) {
+            const std::string &name = item.first;
+            return key.size() == name.size() &&
+                std::equal(
+                    name.begin(), name.end(), key.begin(),
+                    [](char a, char b) { return std::tolower(a) == std::tolower(b); }
+                );
+        }
+    );
+
+    if (it_data->second.stats.end() == it_stat) return {}; // no stat
+
+    return &it_stat->second;
+}
+
+Steam_GameServerStats::CachedAchievement* Steam_GameServerStats::find_ach(CSteamID steamIDUser, const std::string &key)
+{
+    auto it_data = all_users_data.find(steamIDUser.ConvertToUint64());
+    if (all_users_data.end() == it_data) return {}; // no user
+
+    auto it_ach = std::find_if(
+        it_data->second.achievements.begin(), it_data->second.achievements.end(),
+        [&key](std::pair<const std::string, CachedAchievement> &item) {
+            const std::string &name = item.first;
+            return key.size() == name.size() &&
+                std::equal(
+                    name.begin(), name.end(), key.begin(),
+                    [](char a, char b) { return std::tolower(a) == std::tolower(b); }
+                );
+        }
+    );
+
+    if (it_data->second.achievements.end() == it_ach) return {}; // no user
+
+    return &it_ach->second;
+}
+
+Steam_GameServerStats::Steam_GameServerStats(class Settings *settings, class Networking *network, class SteamCallResults *callback_results, class SteamCallBacks *callbacks, class RunEveryRunCB *run_every_runcb)
 {
     this->settings = settings;
     this->network = network;
     this->callback_results = callback_results;
     this->callbacks = callbacks;
+    this->run_every_runcb = run_every_runcb;
+
+    this->network->setCallback(CALLBACK_ID_GAMESERVER_STATS, settings->get_local_steam_id(), &Steam_GameServerStats::steam_gameserverstats_network_callback, this);
+    this->run_every_runcb->add(&Steam_GameServerStats::steam_gameserverstats_run_every_runcb, this);
+
 }
 
+Steam_GameServerStats::~Steam_GameServerStats()
+{
+    this->network->rmCallback(CALLBACK_ID_GAMESERVER_STATS, settings->get_local_steam_id(), &Steam_GameServerStats::steam_gameserverstats_network_callback, this);
+    this->run_every_runcb->remove(&Steam_GameServerStats::steam_gameserverstats_run_every_runcb, this);
+}
+
+
 // downloads stats for the user
 // returns a GSStatsReceived_t callback when completed
 // if the user has no stats, GSStatsReceived_t.m_eResult will be set to k_EResultFail
@@ -33,33 +109,78 @@ Steam_GameServerStats::Steam_GameServerStats(class Settings *settings, class Net
 STEAM_CALL_RESULT( GSStatsReceived_t )
 SteamAPICall_t Steam_GameServerStats::RequestUserStats( CSteamID steamIDUser )
 {
-    PRINT_DEBUG("Steam_GameServerStats::RequestUserStats\n");
+    PRINT_DEBUG("Steam_GameServerStats::RequestUserStats %llu\n", (uint64)steamIDUser.ConvertToUint64());
     std::lock_guard<std::recursive_mutex> lock(global_mutex);
 
-    GSStatsReceived_t data{};
-    data.m_eResult = k_EResultFail;//k_EResultOK;
-    data.m_steamIDUser = steamIDUser;
-    return callback_results->addCallResult(data.k_iCallback, &data, sizeof(data));
+    struct RequestAllStats new_request{};
+    new_request.created = std::chrono::high_resolution_clock::now();
+    new_request.steamAPICall = callback_results->reserveCallResult();
+    new_request.steamIDUser = steamIDUser;
+
+    pending_RequestUserStats.push_back(new_request);
+
+    auto initial_stats_msg = new GameServerStats_Messages::InitialAllStats();
+    initial_stats_msg->set_steam_api_call(new_request.steamAPICall);
+
+    auto gameserverstats_messages = new GameServerStats_Messages();
+    gameserverstats_messages->set_type(GameServerStats_Messages::Request_AllUserStats);
+    gameserverstats_messages->set_allocated_initial_user_stats(initial_stats_msg);
+    
+    Common_Message msg{};
+    // https://protobuf.dev/reference/cpp/cpp-generated/#string
+    // set_allocated_xxx() takes ownership of the allocated object, no need to delete
+    msg.set_allocated_gameserver_stats_messages(gameserverstats_messages);
+    msg.set_source_id(settings->get_local_steam_id().ConvertToUint64());
+    msg.set_dest_id(new_request.steamIDUser.ConvertToUint64());
+    network->sendTo(&msg, true);
+
+    return new_request.steamAPICall;
 }
 
 
 // requests stat information for a user, usable after a successful call to RequestUserStats()
 bool Steam_GameServerStats::GetUserStat( CSteamID steamIDUser, const char *pchName, int32 *pData )
 {
-    PRINT_DEBUG("Steam_GameServerStats::GetUserStat\n");
-    return false;
+    PRINT_DEBUG("Steam_GameServerStats::GetUserStat <int32> %llu '%s' %p\n", (uint64)steamIDUser.ConvertToUint64(), pchName, pData);
+    std::lock_guard<std::recursive_mutex> lock(global_mutex);
+
+    if (!pchName) return false;
+
+    auto stat = find_stat(steamIDUser, pchName);
+    if (!stat) return false;
+    if (stat->stat.stat_type() != GameServerStats_Messages::StatInfo::STAT_TYPE_INT) return false;
+
+    if (pData) *pData = stat->stat.value_int();
+    return true;
 }
 
 bool Steam_GameServerStats::GetUserStat( CSteamID steamIDUser, const char *pchName, float *pData )
 {
-    PRINT_DEBUG("Steam_GameServerStats::GetUserStat\n");
-    return false;
+    PRINT_DEBUG("Steam_GameServerStats::GetUserStat <float> %llu '%s' %p\n", (uint64)steamIDUser.ConvertToUint64(), pchName, pData);
+    std::lock_guard<std::recursive_mutex> lock(global_mutex);
+
+    if (!pchName) return false;
+
+    auto stat = find_stat(steamIDUser, pchName);
+    if (!stat) return false;
+    if (stat->stat.stat_type() == GameServerStats_Messages::StatInfo::STAT_TYPE_INT) return false;
+
+    if (pData) *pData = stat->stat.value_float();
+    return true;
 }
 
 bool Steam_GameServerStats::GetUserAchievement( CSteamID steamIDUser, const char *pchName, bool *pbAchieved )
 {
-    PRINT_DEBUG("Steam_GameServerStats::GetUserAchievement\n");
-    return false;
+    PRINT_DEBUG("Steam_GameServerStats::GetUserAchievement %llu '%s' %p\n", (uint64)steamIDUser.ConvertToUint64(), pchName, pbAchieved);
+    std::lock_guard<std::recursive_mutex> lock(global_mutex);
+
+    if (!pchName) return false;
+
+    auto ach = find_ach(steamIDUser, pchName);
+    if (!ach) return false;
+    if (pbAchieved) *pbAchieved = ach->ach.achieved();
+
+    return true;
 }
 
 
@@ -69,33 +190,98 @@ bool Steam_GameServerStats::GetUserAchievement( CSteamID steamIDUser, const char
 // Set the IP range of your official servers on the Steamworks page
 bool Steam_GameServerStats::SetUserStat( CSteamID steamIDUser, const char *pchName, int32 nData )
 {
-    PRINT_DEBUG("Steam_GameServerStats::SetUserStat\n");
-    return false;
+    PRINT_DEBUG("Steam_GameServerStats::SetUserStat <int32> %llu '%s' %i\n", (uint64)steamIDUser.ConvertToUint64(), pchName, nData);
+    std::lock_guard<std::recursive_mutex> lock(global_mutex);
+
+    if (!pchName) return false;
+
+    auto stat = find_stat(steamIDUser, pchName);
+    if (!stat) return false;
+    if (stat->stat.stat_type() != GameServerStats_Messages::StatInfo::STAT_TYPE_INT) return false;
+    if (stat->stat.value_int() == nData) return true; // don't waste time
+
+    stat->dirty = true;
+    stat->stat.set_value_int(nData);
+    return true;
 }
 
 bool Steam_GameServerStats::SetUserStat( CSteamID steamIDUser, const char *pchName, float fData )
 {
-    PRINT_DEBUG("Steam_GameServerStats::SetUserStat\n");
-    return false;
+    PRINT_DEBUG("Steam_GameServerStats::SetUserStat <float> %llu '%s' %f\n", (uint64)steamIDUser.ConvertToUint64(), pchName, fData);
+    std::lock_guard<std::recursive_mutex> lock(global_mutex);
+
+    if (!pchName) return false;
+
+    auto stat = find_stat(steamIDUser, pchName);
+    if (!stat) return false;
+    if (stat->stat.stat_type() == GameServerStats_Messages::StatInfo::STAT_TYPE_INT) return false;
+    if (stat->stat.value_float() == fData) return true; // don't waste time
+
+    stat->dirty = true;
+    stat->stat.set_value_float(fData); // we set the float field in case it's float or avg
+    return true;
 }
 
 bool Steam_GameServerStats::UpdateUserAvgRateStat( CSteamID steamIDUser, const char *pchName, float flCountThisSession, double dSessionLength )
 {
-    PRINT_DEBUG("Steam_GameServerStats::UpdateUserAvgRateStat\n");
-    return false;
+    PRINT_DEBUG("Steam_GameServerStats::UpdateUserAvgRateStat %llu '%s'\n", (uint64)steamIDUser.ConvertToUint64(), pchName);
+    std::lock_guard<std::recursive_mutex> lock(global_mutex);
+
+    if (!pchName) return false;
+
+    auto stat = find_stat(steamIDUser, pchName);
+    if (!stat) return false;
+    if (stat->stat.stat_type() == GameServerStats_Messages::StatInfo::STAT_TYPE_INT) return false;
+    // don't waste time
+    if (stat->stat.has_value_avg() &&
+        stat->stat.value_avg().count_this_session() == flCountThisSession &&
+        stat->stat.value_avg().session_length() == dSessionLength) {
+        return true;
+    }
+
+    stat->dirty = true;
+
+    // https://protobuf.dev/reference/cpp/cpp-generated/#string
+    // set_allocated_xxx() takes ownership of the allocated object, no need to delete
+    auto avg_info = new GameServerStats_Messages::StatInfo::AvgStatInfo();
+    avg_info->set_count_this_session(flCountThisSession);
+    avg_info->set_session_length(dSessionLength);
+    stat->stat.set_allocated_value_avg(avg_info);
+
+    return true;
 }
 
 
 bool Steam_GameServerStats::SetUserAchievement( CSteamID steamIDUser, const char *pchName )
 {
-    PRINT_DEBUG("Steam_GameServerStats::SetUserAchievement\n");
-    return false;
+    PRINT_DEBUG("Steam_GameServerStats::SetUserAchievement %llu '%s'\n", (uint64)steamIDUser.ConvertToUint64(), pchName);
+    std::lock_guard<std::recursive_mutex> lock(global_mutex);
+
+    if (!pchName) return false;
+
+    auto ach = find_ach(steamIDUser, pchName);
+    if (!ach) return false;
+    if (ach->ach.achieved() == true) return true; // don't waste time
+    
+    ach->dirty = true;
+    ach->ach.set_achieved(true);
+    return true;
 }
 
 bool Steam_GameServerStats::ClearUserAchievement( CSteamID steamIDUser, const char *pchName )
 {
-    PRINT_DEBUG("Steam_GameServerStats::ClearUserAchievement\n");
-    return false;
+    PRINT_DEBUG("Steam_GameServerStats::ClearUserAchievement %llu '%s'\n", (uint64)steamIDUser.ConvertToUint64(), pchName);
+    std::lock_guard<std::recursive_mutex> lock(global_mutex);
+
+    if (!pchName) return false;
+
+    auto ach = find_ach(steamIDUser, pchName);
+    if (!ach) return false;
+    if (ach->ach.achieved() == false) return true; // don't waste time
+    
+    ach->dirty = true;
+    ach->ach.set_achieved(false);
+    return true;
 }
 
 
@@ -108,11 +294,237 @@ bool Steam_GameServerStats::ClearUserAchievement( CSteamID steamIDUser, const ch
 STEAM_CALL_RESULT( GSStatsStored_t )
 SteamAPICall_t Steam_GameServerStats::StoreUserStats( CSteamID steamIDUser )
 {
+    // it's not necessary to send all data here
     PRINT_DEBUG("Steam_GameServerStats::StoreUserStats\n");
     std::lock_guard<std::recursive_mutex> lock(global_mutex);
 
-    GSStatsStored_t data;
-    data.m_eResult = k_EResultOK;
-    data.m_steamIDUser = steamIDUser;
-    return callback_results->addCallResult(data.k_iCallback, &data, sizeof(data));
+    GSStatsStored_t data{};
+
+    if (all_users_data.count(steamIDUser.ConvertToUint64())) {
+        data.m_eResult = EResult::k_EResultOK;
+    } else {
+        data.m_eResult = EResult::k_EResultFail;
+    }
+    data.m_steamIDUser = steamIDUser;
+    return callback_results->addCallResult(data.k_iCallback, &data, sizeof(data), 0.01);
+}
+
+
+
+// --- steam callbacks
+
+void Steam_GameServerStats::remove_timedout_userstats_requests()
+{
+    if (pending_RequestUserStats.empty()) return;
+
+    // send all pending RequestUserStats() requests
+    for (auto &pendReq : pending_RequestUserStats) {
+        if (check_timedout(pendReq.created, PENDING_RequestUserStats_TIMEOUT)) {
+            pendReq.timeout = true;
+
+            GSStatsReceived_t data{};
+            data.m_eResult = k_EResultTimeout;
+            data.m_steamIDUser = pendReq.steamIDUser;
+            callback_results->addCallResult(pendReq.steamAPICall, data.k_iCallback, &data, sizeof(data));
+            
+            PRINT_DEBUG(
+                "Steam_GameServerStats::steam_run_callback RequestUserStats timeout, %llu\n",
+                pendReq.steamIDUser.ConvertToUint64()
+            );
+        }
+    }
+
+    // remove all timedout requests
+    auto itrm = std::remove_if(
+        pending_RequestUserStats.begin(), pending_RequestUserStats.end(),
+        [](const struct RequestAllStats &item) { return item.timeout; }
+    );
+    pending_RequestUserStats.erase(itrm, pending_RequestUserStats.end());
+}
+
+void Steam_GameServerStats::collect_and_send_updated_user_stats()
+{
+	std::map<uint64, UserData> updated_users_data{}; // new data to send
+
+    // collect new data
+    for (auto &this_user : all_users_data) { // foreach user
+        uint64 user_steamid = this_user.first;
+
+        // collect changed stats
+        for (auto &user_stat : this_user.second.stats) {
+            if (user_stat.second.dirty) {
+                user_stat.second.dirty = false;
+                updated_users_data[user_steamid].stats[user_stat.first] = user_stat.second;
+                // clear this to avoid sending it to the user next time
+                if (user_stat.second.stat.has_value_avg()) user_stat.second.stat.clear_value_avg();
+            }
+        }
+
+        // collect changed achievements
+        for (auto &user_ach : this_user.second.achievements) {
+            if (user_ach.second.dirty) {
+                user_ach.second.dirty = false;
+                updated_users_data[user_steamid].achievements[user_ach.first] = user_ach.second;
+            }
+        }
+    }
+
+    // send new user stats
+    for (auto &user_new_data : updated_users_data) { // foreach user
+        uint64 user_steamid = user_new_data.first;
+        const auto &new_data = user_new_data.second;
+        auto updated_stats_msg = new GameServerStats_Messages::AllStats();
+
+        // copy new stats
+        auto &updated_stats_map = *updated_stats_msg->mutable_user_stats();
+        for (auto &new_stat : new_data.stats) {
+            updated_stats_map[new_stat.first] = new_stat.second.stat;
+            
+        }
+
+        // copy new achievements
+        auto &updated_achs_map = *updated_stats_msg->mutable_user_achievements();
+        for (auto &new_ach : new_data.achievements) {
+            updated_achs_map[new_ach.first] = new_ach.second.ach;
+            
+        }
+        
+        auto gameserverstats_msg = new GameServerStats_Messages();
+        gameserverstats_msg->set_type(GameServerStats_Messages::UpdateUserStats);
+        gameserverstats_msg->set_allocated_update_user_stats(updated_stats_msg);
+        
+        Common_Message msg{};
+        // https://protobuf.dev/reference/cpp/cpp-generated/#string
+        // set_allocated_xxx() takes ownership of the allocated object, no need to delete
+        msg.set_allocated_gameserver_stats_messages(gameserverstats_msg);
+        msg.set_source_id(settings->get_local_steam_id().ConvertToUint64());
+        msg.set_dest_id(user_steamid);
+        network->sendTo(&msg, true);
+
+        PRINT_DEBUG(
+            "Steam_GameServerStats::collect_and_send_updated_user_stats server sent updated stats %llu: %zu stats, %zu achievements\n",
+            user_steamid, updated_stats_msg->user_stats().size(), updated_stats_msg->user_achievements().size()
+        );
+    }
+
+}
+
+void Steam_GameServerStats::steam_run_callback()
+{
+    remove_timedout_userstats_requests();
+    collect_and_send_updated_user_stats();
+}
+
+
+
+// --- networking callbacks
+
+void Steam_GameServerStats::network_callback_initial_stats(Common_Message *msg)
+{
+    uint64 user_steamid = msg->source_id();
+
+    PRINT_DEBUG("Steam_GameServerStats::network_callback_initial_stats player sent all their stats %llu\n", user_steamid);
+    if (!msg->gameserver_stats_messages().has_initial_user_stats() ||
+        !msg->gameserver_stats_messages().initial_user_stats().has_all_data()) {
+        PRINT_DEBUG("Steam_GameServerStats::network_callback_initial_stats error empty msg\n");
+        return;
+    }
+
+    const auto &new_data = msg->gameserver_stats_messages().initial_user_stats();
+    
+    // find this pending request
+    auto it = std::find_if(
+        pending_RequestUserStats.begin(), pending_RequestUserStats.end(),
+        [=](const RequestAllStats &item) { 
+            return item.steamAPICall == new_data.steam_api_call() &&
+                item.steamIDUser == user_steamid;
+        }
+    );
+    if (pending_RequestUserStats.end()  == it) { // timeout and already removed
+        PRINT_DEBUG("Steam_GameServerStats::network_callback_initial_stats error got all player stats but pending request timedout and removed\n");
+        return;
+    }
+
+    // remove this pending request
+    pending_RequestUserStats.erase(it);
+    
+    // copy new stats
+    auto &current_stats = all_users_data[user_steamid].stats;
+    current_stats.clear();
+    for (const auto &new_stat : new_data.all_data().user_stats()) {
+        current_stats[new_stat.first].stat = new_stat.second;
+    }
+    
+    // copy new achievements
+    auto &current_achievements = all_users_data[user_steamid].achievements;
+    current_achievements.clear();
+    for (const auto &new_ach : new_data.all_data().user_achievements()) {
+        current_achievements[new_ach.first].ach = new_ach.second;
+    }
+
+    GSStatsReceived_t data{};
+    data.m_eResult = EResult::k_EResultOK;
+    data.m_steamIDUser = user_steamid;
+    callback_results->addCallResult(it->steamAPICall, data.k_iCallback, &data, sizeof(data));
+    
+    PRINT_DEBUG(
+        "Steam_GameServerStats::network_callback_initial_stats server got all player stats %llu: %zu stats, %zu achievements\n",
+        user_steamid, all_users_data[user_steamid].stats.size(), all_users_data[user_steamid].achievements.size()
+    );
+
+    
+}
+
+void Steam_GameServerStats::network_callback_updated_stats(Common_Message *msg)
+{
+    uint64 user_steamid = msg->source_id();
+
+    PRINT_DEBUG("Steam_GameServerStats::network_callback_updated_stats player sent updated stats %llu\n", user_steamid);
+    if (!msg->gameserver_stats_messages().has_update_user_stats()) {
+        PRINT_DEBUG("Steam_GameServerStats::network_callback_updated_stats error empty msg\n");
+        return;
+    }
+
+    auto &current_user_data = all_users_data[user_steamid];
+    auto &new_user_data =msg->gameserver_stats_messages().update_user_stats();
+
+    // update stats
+    for (auto &new_stat : new_user_data.user_stats()) {
+        auto &current_stat = current_user_data.stats[new_stat.first];
+        current_stat.dirty = false;
+        current_stat.stat = new_stat.second;
+    }
+
+    // update achievements
+    for (auto &new_ach : new_user_data.user_achievements()) {
+        auto &current_ach = current_user_data.achievements[new_ach.first];
+        current_ach.dirty = false;
+        current_ach.ach = new_ach.second;
+    }
+    
+    PRINT_DEBUG(
+        "Steam_GameServerStats::network_callback got updated user stats %llu: %zu stats, %zu achievements\n",
+        user_steamid, new_user_data.user_stats().size(), new_user_data.user_achievements().size()
+    );
+}
+
+// only triggered when we have a message
+void Steam_GameServerStats::network_callback(Common_Message *msg)
+{
+    switch (msg->gameserver_stats_messages().type())
+    {
+    // user sent all their stats
+    case GameServerStats_Messages::Response_AllUserStats:
+        network_callback_initial_stats(msg);
+    break;
+
+    // user has updated/new stats
+    case GameServerStats_Messages::UpdateUserStats:
+        network_callback_updated_stats(msg);
+    break;
+    
+    default:
+        PRINT_DEBUG("Steam_GameServerStats::network_callback unhandled type %i\n", (int)msg->gameserver_stats_messages().type());
+    break;
+    }
 }