On login, load Player from DB in shard thread, not in login thread

This avoids some needless data shuffling and fixes a rare desync.

src/PlayerManager.cpp

@@ -224,18 +224,22 @@ static void enterPlayer(CNSocket* sock, CNPacketData* data) {
         return;
     }
 
-    // for convenience
-    Player& plr = lm->plr;
-
-    plr.groupCnt = 1;
-    plr.iIDGroup = plr.groupIDs[0] = plr.iID;
+    Player plr = {};
+    Database::getPlayer(&plr, lm->playerId);
 
     // check if account is already in use
     if (isAccountInUse(plr.accountId)) {
         // kick the other player
         exitDuplicate(plr.accountId);
+
+        // re-read the player from disk, in case it was just flushed
+        plr = {};
+        Database::getPlayer(&plr, lm->playerId);
     }
 
+    plr.groupCnt = 1;
+    plr.iIDGroup = plr.groupIDs[0] = plr.iID;
+
     response.iID = plr.iID;
     response.uiSvrTime = getTime();
     response.PCLoadData2CL.iUserLevel = plr.accountLevel;
@@ -345,7 +349,7 @@ static void enterPlayer(CNSocket* sock, CNPacketData* data) {
         if (pair.second->notify)
             Chat::sendServerMessage(pair.first, "[ADMIN]" + getPlayerName(&plr) + " has joined.");
 
-    // deallocate lm (and therefore the plr object)
+    // deallocate lm
     delete lm;
 }
 

src/core/CNShared.hpp

@@ -18,7 +18,7 @@
 
 struct LoginMetadata {
     uint64_t FEKey;
-    Player plr;
+    int32_t playerId;
     time_t timestamp;
 };
 

src/db/Database.hpp

@@ -52,7 +52,8 @@ namespace Database {
     bool banPlayer(int playerId, std::string& reason);
     bool unbanPlayer(int playerId);
 
-    void updateSelected(int accountId, int playerId);
+    void updateSelected(int accountId, int slot);
+    void updateSelectedByPlayerId(int accountId, int playerId);
     
     bool validateCharacter(int characterID, int userID);
     bool isNameFree(std::string firstName, std::string lastName);

src/db/login.cpp

@@ -79,6 +79,29 @@ void Database::updateSelected(int accountId, int slot) {
         std::cout << "[WARN] Database fail on updateSelected(): " << sqlite3_errmsg(db) << std::endl;
 }
 
+void Database::updateSelectedByPlayerId(int accountId, int32_t playerId) {
+    std::lock_guard<std::mutex> lock(dbCrit);
+
+    const char* sql = R"(
+        UPDATE Accounts SET
+            Selected = p.Slot,
+            LastLogin = (strftime('%s', 'now'))
+        FROM (SELECT Slot From Players WHERE PlayerId = ?) AS p
+        WHERE AccountID = ?;
+        )";
+
+    sqlite3_stmt* stmt;
+
+    sqlite3_prepare_v2(db, sql, -1, &stmt, NULL);
+    sqlite3_bind_int(stmt, 1, playerId);
+    sqlite3_bind_int(stmt, 2, accountId);
+    int rc = sqlite3_step(stmt);
+    sqlite3_finalize(stmt);
+
+    if (rc != SQLITE_DONE)
+        std::cout << "[WARN] Database fail on updateSelectedByPlayerId(): " << sqlite3_errmsg(db) << std::endl;
+}
+
 bool Database::validateCharacter(int characterID, int userID) {
     std::lock_guard<std::mutex> lock(dbCrit);
 

src/servers/CNLoginServer.cpp

@@ -471,11 +471,7 @@ void CNLoginServer::characterSelect(CNSocket* sock, CNPacketData* data) {
     LoginMetadata *lm = new LoginMetadata();
     lm->FEKey = sock->getFEKey();
     lm->timestamp = getTime();
-
-    Database::getPlayer(&lm->plr, selection->iPC_UID);
-    // this should never happen but for extra safety
-    if (lm->plr.iID == 0)
-        return invalidCharacter(sock);
+    lm->playerId = selection->iPC_UID;
 
     resp.iEnterSerialKey = Rand::cryptoRand();
 
@@ -485,7 +481,7 @@ void CNLoginServer::characterSelect(CNSocket* sock, CNPacketData* data) {
     sock->sendPacket(resp, P_LS2CL_REP_SHARD_SELECT_SUCC);
 
     // update current slot in DB
-    Database::updateSelected(loginSessions[sock].userID, lm->plr.slot);
+    Database::updateSelectedByPlayerId(loginSessions[sock].userID, selection->iPC_UID);
 }
 
 void CNLoginServer::finishTutorial(CNSocket* sock, CNPacketData* data) {