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feat: refuse stale character saves with a save generation

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Every character gets a save generation in charxml. A world bumps it when it loads the character for
play, and every save from that world only goes through while the stored generation is still the
one it loaded or last saved (and moves it on). Dashboard edits, restores and maintenance writes bump
it too. A world that lost the character to another world (a disconnect noticed late, a zone
transfer, an instance migration) or to a dashboard edit can no longer overwrite the newer data: the
save is refused, logged and audited as stale_save_refused, the world stops saving that character
and a player still connected to it is disconnected with the save failure reason so they reload.

Fixes #639

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-26 19:10:16 -05:00
parent 17689cd663
commit 341ce89a6a
14 changed files with 280 additions and 6 deletions
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21
dDatabase/GameDatabase/MySQL/Tables/CharXml.cpp
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@@ -11,7 +11,26 @@ std::string MySQLDatabase::GetCharacterXml(const LWOOBJID charId) {
}
void MySQLDatabase::UpdateCharacterXml(const LWOOBJID charId, const std::string_view lxfml) {
ExecuteUpdate("UPDATE charxml SET xml_data = ? WHERE id = ?;", lxfml, charId);
ExecuteUpdate("UPDATE charxml SET xml_data = ?, save_generation = save_generation + 1 WHERE id = ?;", lxfml, charId);
}
std::optional<ICharXml::CharacterXml> MySQLDatabase::ClaimCharacterXml(const LWOOBJID charId) {
ExecuteUpdate("UPDATE charxml SET save_generation = save_generation + 1 WHERE id = ?;", charId);
// Read both from one row, so a write in between still leaves a matching pair
auto result = ExecuteSelect("SELECT xml_data, save_generation FROM charxml WHERE id = ? LIMIT 1;", charId);
if (!result->next()) return std::nullopt;
return CharacterXml{ result->getString("xml_data").c_str(), static_cast<uint64_t>(result->getInt64("save_generation")) };
}
bool MySQLDatabase::SaveCharacterXml(const LWOOBJID charId, const std::string_view lxfml, const uint64_t generation) {
// The generation always changes, so a matching row is always counted as affected
return ExecuteUpdate("UPDATE charxml SET xml_data = ?, save_generation = ? WHERE id = ? AND save_generation = ?;",
lxfml, static_cast<int64_t>(generation + 1), charId, static_cast<int64_t>(generation)) > 0;
}
uint64_t MySQLDatabase::GetCharacterSaveGeneration(const LWOOBJID charId) {
auto result = ExecuteSelect("SELECT save_generation FROM charxml WHERE id = ? LIMIT 1;", charId);
return result->next() ? static_cast<uint64_t>(result->getInt64("save_generation")) : 0;
}
void MySQLDatabase::InsertCharacterXml(const LWOOBJID characterId, const std::string_view lxfml) {