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Automatically increase database limits when hit

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Nicolas Werner 2023-11-19 23:44:19 +01:00
parent ebbd8f3341
commit 6f52686162
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GPG key ID: C8D75E610773F2D9
1 changed files with 64 additions and 7 deletions
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71
src/Cache.cpp
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@ -39,7 +39,9 @@
//! Should be changed when a breaking change occurs in the cache format.
//! This will reset client's data.
static const std::string CURRENT_CACHE_FORMAT_VERSION{"2023.10.22"};
static constexpr std::string_view CURRENT_CACHE_FORMAT_VERSION{"2023.10.22"};
static constexpr std::string_view MAX_DBS_SETTINGS_KEY{"database/maxdbs"};
static constexpr std::string_view MAX_DB_SIZE_SETTINGS_KEY{"database/maxsize"};
//! Keys used for the DB
static const std::string_view NEXT_BATCH_KEY("next_batch");
@ -47,13 +49,13 @@ static const std::string_view OLM_ACCOUNT_KEY("olm_account");
static const std::string_view CACHE_FORMAT_VERSION_KEY("cache_format_version");
static const std::string_view CURRENT_ONLINE_BACKUP_VERSION("current_online_backup_version");
static constexpr auto MAX_DBS = 32384UL;
static constexpr auto MAX_DBS_DEFAULT = 32384U;
#if Q_PROCESSOR_WORDSIZE >= 5 // 40-bit or more, up to 2^(8*WORDSIZE) words addressable.
static constexpr auto DB_SIZE = 32ULL * 1024ULL * 1024ULL * 1024ULL; // 32 GB
static constexpr auto DB_SIZE_DEFAULT = 32ULL * 1024ULL * 1024ULL * 1024ULL; // 32 GB
static constexpr size_t MAX_RESTORED_MESSAGES = 30'000;
#elif Q_PROCESSOR_WORDSIZE == 4 // 32-bit address space limits mmaps
static constexpr auto DB_SIZE = 1ULL * 1024ULL * 1024ULL * 1024ULL; // 1 GB
static constexpr auto DB_SIZE_DEFAULT = 1ULL * 1024ULL * 1024ULL * 1024ULL; // 1 GB
static constexpr size_t MAX_RESTORED_MESSAGES = 5'000;
#else
#error Not enough virtual address space for the database on target CPU
@ -350,9 +352,28 @@ Cache::setup()
}
auto openEnv = [](const QString &name) {
auto settings = UserSettings::instance();
std::size_t dbSize = std::max(
settings->qsettings()->value(MAX_DB_SIZE_SETTINGS_KEY, DB_SIZE_DEFAULT).toULongLong(),
DB_SIZE_DEFAULT);
unsigned dbCount =
std::max(settings->qsettings()->value(MAX_DBS_SETTINGS_KEY, MAX_DBS_DEFAULT).toUInt(),
MAX_DBS_DEFAULT);
// ignore unreasonably high values of more than a quarter of the addressable memory
if (dbSize > (1ull << (Q_PROCESSOR_WORDSIZE * 8 - 2))) {
dbSize = DB_SIZE_DEFAULT;
}
// Limit databases to about a million. This would cause more than 7-120MB to get written on
// every commit, which I doubt would work well. File an issue, if you tested this and it
// works fine.
if (dbCount > (1u << 20)) {
dbCount = 1u << 20;
}
auto e = lmdb::env::create();
e.set_mapsize(DB_SIZE);
e.set_max_dbs(MAX_DBS);
e.set_mapsize(dbSize);
e.set_max_dbs(dbCount);
e.open(name.toStdString().c_str(), MDB_NOMETASYNC | MDB_NOSYNC);
return e;
};
@ -2243,7 +2264,7 @@ Cache::saveStateEvent(lmdb::txn &txn,
void
Cache::saveState(const mtx::responses::Sync &res)
{
try {
using namespace mtx::events;
auto local_user_id = this->localUserId_.toStdString();
@ -2489,6 +2510,42 @@ Cache::saveState(const mtx::responses::Sync &res)
}
emit roomReadStatus(readStatus);
} catch (const lmdb::error &lmdbException) {
if (lmdbException.code() == MDB_DBS_FULL || lmdbException.code() == MDB_MAP_FULL) {
if (lmdbException.code() == MDB_DBS_FULL) {
auto settings = UserSettings::instance();
unsigned roomDbCount =
static_cast<unsigned>((res.rooms.invite.size() + res.rooms.join.size() +
res.rooms.knock.size() + res.rooms.leave.size()) *
20);
settings->qsettings()->setValue(
MAX_DBS_SETTINGS_KEY,
std::max(
settings->qsettings()->value(MAX_DBS_SETTINGS_KEY, MAX_DBS_DEFAULT).toUInt() * 2,
roomDbCount));
} else if (lmdbException.code() == MDB_MAP_FULL) {
auto settings = UserSettings::instance();
MDB_envinfo envinfo = {};
lmdb::env_info(env_, &envinfo);
settings->qsettings()->setValue(MAX_DB_SIZE_SETTINGS_KEY,
static_cast<qulonglong>(envinfo.me_mapsize * 2));
}
QMessageBox::warning(
nullptr,
tr("Database limit reached"),
tr("Your account is larger than our default database limit. We have "
"increased the capacity automatically, however you will need to "
"restart to apply this change. Nheko will now close automatically."),
QMessageBox::StandardButton::Close);
QCoreApplication::exit(1);
exit(1);
}
throw;
}
void