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401 lines
13 KiB
401 lines
13 KiB
/*
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* nheko Copyright (C) 2017 Konstantinos Sideris <siderisk@auth.gr>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdexcept>
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#include <QDebug>
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#include <QFile>
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#include <QStandardPaths>
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#include "Cache.h"
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#include "RoomState.h"
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static const std::string CURRENT_CACHE_FORMAT_VERSION("2017.12.10");
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static const lmdb::val NEXT_BATCH_KEY("next_batch");
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static const lmdb::val CACHE_FORMAT_VERSION_KEY("cache_format_version");
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Cache::Cache(const QString &userId)
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: env_{nullptr}
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, stateDb_{0}
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, roomDb_{0}
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, invitesDb_{0}
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, isMounted_{false}
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, userId_{userId}
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{}
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void
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Cache::setup()
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{
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qDebug() << "Setting up cache";
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auto statePath = QString("%1/%2/state")
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.arg(QStandardPaths::writableLocation(QStandardPaths::CacheLocation))
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.arg(QString::fromUtf8(userId_.toUtf8().toHex()));
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cacheDirectory_ = QString("%1/%2")
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.arg(QStandardPaths::writableLocation(QStandardPaths::CacheLocation))
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.arg(QString::fromUtf8(userId_.toUtf8().toHex()));
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bool isInitial = !QFile::exists(statePath);
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env_ = lmdb::env::create();
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env_.set_mapsize(128UL * 1024UL * 1024UL); /* 128 MB */
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env_.set_max_dbs(1024UL);
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if (isInitial) {
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qDebug() << "First time initializing LMDB";
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if (!QDir().mkpath(statePath)) {
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throw std::runtime_error(
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("Unable to create state directory:" + statePath).toStdString().c_str());
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}
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}
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try {
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env_.open(statePath.toStdString().c_str());
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} catch (const lmdb::error &e) {
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if (e.code() != MDB_VERSION_MISMATCH && e.code() != MDB_INVALID) {
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throw std::runtime_error("LMDB initialization failed" +
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std::string(e.what()));
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}
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qWarning() << "Resetting cache due to LMDB version mismatch:" << e.what();
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QDir stateDir(statePath);
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for (const auto &file : stateDir.entryList(QDir::NoDotAndDotDot)) {
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if (!stateDir.remove(file))
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throw std::runtime_error(
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("Unable to delete file " + file).toStdString().c_str());
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}
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env_.open(statePath.toStdString().c_str());
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}
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auto txn = lmdb::txn::begin(env_);
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stateDb_ = lmdb::dbi::open(txn, "state", MDB_CREATE);
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roomDb_ = lmdb::dbi::open(txn, "rooms", MDB_CREATE);
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invitesDb_ = lmdb::dbi::open(txn, "invites", MDB_CREATE);
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txn.commit();
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isMounted_ = true;
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}
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void
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Cache::setState(const QString &nextBatchToken, const QMap<QString, RoomState> &states)
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{
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if (!isMounted_)
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return;
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try {
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auto txn = lmdb::txn::begin(env_);
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setNextBatchToken(txn, nextBatchToken);
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for (auto it = states.constBegin(); it != states.constEnd(); ++it)
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insertRoomState(txn, it.key(), it.value());
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txn.commit();
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} catch (const lmdb::error &e) {
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qCritical() << "The cache couldn't be updated: " << e.what();
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unmount();
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deleteData();
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}
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}
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void
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Cache::insertRoomState(lmdb::txn &txn, const QString &roomid, const RoomState &state)
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{
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auto stateEvents = state.serialize();
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auto id = roomid.toUtf8();
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lmdb::dbi_put(txn, roomDb_, lmdb::val(id.data(), id.size()), lmdb::val(stateEvents));
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for (const auto &membership : state.memberships) {
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lmdb::dbi membersDb =
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lmdb::dbi::open(txn, roomid.toStdString().c_str(), MDB_CREATE);
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// The user_id this membership event relates to, is used
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// as the index on the membership database.
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auto key = membership.second.state_key;
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// Serialize membership event.
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nlohmann::json data = membership.second;
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std::string memberEvent = data.dump();
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switch (membership.second.content.membership) {
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// We add or update (e.g invite -> join) a new user to the membership
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// list.
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case mtx::events::state::Membership::Invite:
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case mtx::events::state::Membership::Join: {
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lmdb::dbi_put(txn, membersDb, lmdb::val(key), lmdb::val(memberEvent));
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break;
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}
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// We remove the user from the membership list.
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case mtx::events::state::Membership::Leave:
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case mtx::events::state::Membership::Ban: {
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lmdb::dbi_del(txn, membersDb, lmdb::val(key), lmdb::val(memberEvent));
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break;
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}
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case mtx::events::state::Membership::Knock: {
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qWarning()
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<< "Skipping knock membership" << roomid << QString::fromStdString(key);
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break;
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}
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}
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}
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}
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void
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Cache::removeRoom(const QString &roomid)
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{
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if (!isMounted_)
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return;
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auto txn = lmdb::txn::begin(env_, nullptr, 0);
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lmdb::dbi_del(txn, roomDb_, lmdb::val(roomid.toUtf8(), roomid.toUtf8().size()), nullptr);
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txn.commit();
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}
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void
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Cache::removeInvite(const QString &room_id)
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{
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if (!isMounted_)
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return;
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auto txn = lmdb::txn::begin(env_, nullptr, 0);
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lmdb::dbi_del(
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txn, invitesDb_, lmdb::val(room_id.toUtf8(), room_id.toUtf8().size()), nullptr);
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txn.commit();
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}
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QMap<QString, RoomState>
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Cache::states()
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{
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QMap<QString, RoomState> states;
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auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
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auto cursor = lmdb::cursor::open(txn, roomDb_);
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std::string room;
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std::string stateData;
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// Retrieve all the room names.
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while (cursor.get(room, stateData, MDB_NEXT)) {
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auto roomid = QString::fromUtf8(room.data(), room.size());
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auto json = nlohmann::json::parse(stateData);
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RoomState state;
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state.parse(json);
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auto memberDb = lmdb::dbi::open(txn, roomid.toStdString().c_str(), MDB_CREATE);
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std::map<std::string, mtx::events::StateEvent<mtx::events::state::Member>> members;
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auto memberCursor = lmdb::cursor::open(txn, memberDb);
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std::string memberId;
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std::string memberContent;
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while (memberCursor.get(memberId, memberContent, MDB_NEXT)) {
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auto userid = QString::fromStdString(memberId);
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try {
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auto data = nlohmann::json::parse(memberContent);
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mtx::events::StateEvent<mtx::events::state::Member> member = data;
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members.emplace(memberId, member);
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} catch (std::exception &e) {
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qWarning() << "Fault while parsing member event" << e.what()
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<< QString::fromStdString(memberContent);
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continue;
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}
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}
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qDebug() << members.size() << "members for" << roomid;
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state.memberships = members;
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states.insert(roomid, state);
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}
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qDebug() << "Retrieved" << states.size() << "rooms";
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cursor.close();
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txn.commit();
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return states;
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}
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void
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Cache::setNextBatchToken(lmdb::txn &txn, const QString &token)
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{
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auto value = token.toUtf8();
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lmdb::dbi_put(txn, stateDb_, NEXT_BATCH_KEY, lmdb::val(value.data(), value.size()));
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}
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bool
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Cache::isInitialized() const
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{
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auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
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lmdb::val token;
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bool res = lmdb::dbi_get(txn, stateDb_, NEXT_BATCH_KEY, token);
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txn.commit();
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return res;
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}
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QString
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Cache::nextBatchToken() const
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{
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auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
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lmdb::val token;
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lmdb::dbi_get(txn, stateDb_, NEXT_BATCH_KEY, token);
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txn.commit();
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return QString::fromUtf8(token.data(), token.size());
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}
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void
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Cache::deleteData()
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{
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qInfo() << "Deleting cache data";
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if (!cacheDirectory_.isEmpty())
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QDir(cacheDirectory_).removeRecursively();
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}
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bool
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Cache::isFormatValid()
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{
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auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
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lmdb::val current_version;
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bool res = lmdb::dbi_get(txn, stateDb_, CACHE_FORMAT_VERSION_KEY, current_version);
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txn.commit();
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if (!res)
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return false;
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std::string stored_version(current_version.data(), current_version.size());
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if (stored_version != CURRENT_CACHE_FORMAT_VERSION) {
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qWarning() << "Stored format version" << QString::fromStdString(stored_version);
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qWarning() << "There are breaking changes in the cache format.";
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return false;
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}
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return true;
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}
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void
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Cache::setCurrentFormat()
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{
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auto txn = lmdb::txn::begin(env_);
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lmdb::dbi_put(
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txn,
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stateDb_,
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CACHE_FORMAT_VERSION_KEY,
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lmdb::val(CURRENT_CACHE_FORMAT_VERSION.data(), CURRENT_CACHE_FORMAT_VERSION.size()));
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txn.commit();
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}
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std::map<std::string, mtx::responses::InvitedRoom>
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Cache::invites()
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{
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std::map<std::string, mtx::responses::InvitedRoom> invites;
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auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
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auto cursor = lmdb::cursor::open(txn, invitesDb_);
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std::string room_id;
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std::string payload;
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mtx::responses::InvitedRoom state;
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while (cursor.get(room_id, payload, MDB_NEXT)) {
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state = nlohmann::json::parse(payload);
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invites.emplace(room_id, state);
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}
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if (invites.size() > 0)
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qDebug() << "Retrieved" << invites.size() << "invites";
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cursor.close();
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txn.commit();
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return invites;
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}
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void
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Cache::setInvites(const std::map<std::string, mtx::responses::InvitedRoom> &invites)
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{
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if (!isMounted_)
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return;
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using Aliases = mtx::events::StrippedEvent<mtx::events::state::Aliases>;
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using Avatar = mtx::events::StrippedEvent<mtx::events::state::Avatar>;
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using Member = mtx::events::StrippedEvent<mtx::events::state::Member>;
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using Name = mtx::events::StrippedEvent<mtx::events::state::Name>;
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using Topic = mtx::events::StrippedEvent<mtx::events::state::Topic>;
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try {
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auto txn = lmdb::txn::begin(env_);
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for (auto it = invites.cbegin(); it != invites.cend(); ++it) {
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nlohmann::json j;
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for (const auto &e : it->second.invite_state) {
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if (mpark::holds_alternative<Name>(e)) {
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j["invite_state"]["events"].push_back(mpark::get<Name>(e));
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} else if (mpark::holds_alternative<Topic>(e)) {
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j["invite_state"]["events"].push_back(mpark::get<Topic>(e));
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} else if (mpark::holds_alternative<Avatar>(e)) {
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j["invite_state"]["events"].push_back(
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mpark::get<Avatar>(e));
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} else if (mpark::holds_alternative<Aliases>(e)) {
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j["invite_state"]["events"].push_back(
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mpark::get<Aliases>(e));
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} else if (mpark::holds_alternative<Member>(e)) {
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j["invite_state"]["events"].push_back(
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mpark::get<Member>(e));
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}
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}
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lmdb::dbi_put(txn, invitesDb_, lmdb::val(it->first), lmdb::val(j.dump()));
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}
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txn.commit();
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} catch (const lmdb::error &e) {
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qCritical() << "setInvitedRooms: " << e.what();
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unmount();
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}
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}
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