matrixion/src/Cache.cc

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/*
* nheko Copyright (C) 2017 Konstantinos Sideris <siderisk@auth.gr>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdexcept>
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#include <QByteArray>
#include <QDebug>
#include <QFile>
#include <QStandardPaths>
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#include <variant.hpp>
#include "Cache.h"
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#include "RoomState.h"
static const std::string CURRENT_CACHE_FORMAT_VERSION("2018.01.14");
static const lmdb::val NEXT_BATCH_KEY("next_batch");
static const lmdb::val CACHE_FORMAT_VERSION_KEY("cache_format_version");
using CachedReceipts = std::multimap<uint64_t, std::string, std::greater<uint64_t>>;
using Receipts = std::map<std::string, std::map<std::string, uint64_t>>;
Cache::Cache(const QString &userId, QObject *parent)
: QObject{parent}
, env_{nullptr}
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, stateDb_{0}
, roomDb_{0}
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, invitesDb_{0}
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, imagesDb_{0}
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, readReceiptsDb_{0}
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, isMounted_{false}
, userId_{userId}
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{}
void
Cache::setup()
{
qDebug() << "Setting up cache";
auto statePath = QString("%1/%2/state")
.arg(QStandardPaths::writableLocation(QStandardPaths::CacheLocation))
.arg(QString::fromUtf8(userId_.toUtf8().toHex()));
cacheDirectory_ = QString("%1/%2")
.arg(QStandardPaths::writableLocation(QStandardPaths::CacheLocation))
.arg(QString::fromUtf8(userId_.toUtf8().toHex()));
bool isInitial = !QFile::exists(statePath);
env_ = lmdb::env::create();
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env_.set_mapsize(256UL * 1024UL * 1024UL); /* 256 MB */
env_.set_max_dbs(1024UL);
if (isInitial) {
qDebug() << "First time initializing LMDB";
if (!QDir().mkpath(statePath)) {
throw std::runtime_error(
("Unable to create state directory:" + statePath).toStdString().c_str());
}
}
try {
env_.open(statePath.toStdString().c_str());
} catch (const lmdb::error &e) {
if (e.code() != MDB_VERSION_MISMATCH && e.code() != MDB_INVALID) {
throw std::runtime_error("LMDB initialization failed" +
std::string(e.what()));
}
qWarning() << "Resetting cache due to LMDB version mismatch:" << e.what();
QDir stateDir(statePath);
for (const auto &file : stateDir.entryList(QDir::NoDotAndDotDot)) {
if (!stateDir.remove(file))
throw std::runtime_error(
("Unable to delete file " + file).toStdString().c_str());
}
env_.open(statePath.toStdString().c_str());
}
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auto txn = lmdb::txn::begin(env_);
stateDb_ = lmdb::dbi::open(txn, "state", MDB_CREATE);
roomDb_ = lmdb::dbi::open(txn, "rooms", MDB_CREATE);
invitesDb_ = lmdb::dbi::open(txn, "invites", MDB_CREATE);
imagesDb_ = lmdb::dbi::open(txn, "images", MDB_CREATE);
readReceiptsDb_ = lmdb::dbi::open(txn, "read_receipts", MDB_CREATE);
txn.commit();
isMounted_ = true;
}
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void
Cache::saveImage(const QString &url, const QByteArray &image)
{
if (!isMounted_)
return;
auto key = url.toUtf8();
try {
auto txn = lmdb::txn::begin(env_);
lmdb::dbi_put(txn,
imagesDb_,
lmdb::val(key.data(), key.size()),
lmdb::val(image.data(), image.size()));
txn.commit();
} catch (const lmdb::error &e) {
qCritical() << "saveImage:" << e.what();
}
}
QByteArray
Cache::image(const QString &url) const
{
auto key = url.toUtf8();
try {
auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
lmdb::val image;
bool res = lmdb::dbi_get(txn, imagesDb_, lmdb::val(key.data(), key.size()), image);
txn.commit();
if (!res)
return QByteArray();
return QByteArray(image.data(), image.size());
} catch (const lmdb::error &e) {
qCritical() << "image:" << e.what();
}
return QByteArray();
}
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void
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Cache::setState(const QString &nextBatchToken,
const std::map<QString, QSharedPointer<RoomState>> &states)
{
if (!isMounted_)
return;
try {
auto txn = lmdb::txn::begin(env_);
setNextBatchToken(txn, nextBatchToken);
for (auto const &state : states)
insertRoomState(txn, state.first, state.second);
txn.commit();
} catch (const lmdb::error &e) {
qCritical() << "The cache couldn't be updated: " << e.what();
unmount();
deleteData();
}
}
void
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Cache::insertRoomState(lmdb::txn &txn,
const QString &roomid,
const QSharedPointer<RoomState> &state)
{
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auto stateEvents = state->serialize();
auto id = roomid.toUtf8();
lmdb::dbi_put(txn, roomDb_, lmdb::val(id.data(), id.size()), lmdb::val(stateEvents));
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for (const auto &membership : state->memberships) {
lmdb::dbi membersDb =
lmdb::dbi::open(txn, roomid.toStdString().c_str(), MDB_CREATE);
// The user_id this membership event relates to, is used
// as the index on the membership database.
auto key = membership.second.state_key;
// Serialize membership event.
nlohmann::json data = membership.second;
std::string memberEvent = data.dump();
switch (membership.second.content.membership) {
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// We add or update (e.g invite -> join) a new user to the membership
// list.
case mtx::events::state::Membership::Invite:
case mtx::events::state::Membership::Join: {
lmdb::dbi_put(txn, membersDb, lmdb::val(key), lmdb::val(memberEvent));
break;
}
// We remove the user from the membership list.
case mtx::events::state::Membership::Leave:
case mtx::events::state::Membership::Ban: {
lmdb::dbi_del(txn, membersDb, lmdb::val(key), lmdb::val(memberEvent));
break;
}
case mtx::events::state::Membership::Knock: {
qWarning()
<< "Skipping knock membership" << roomid << QString::fromStdString(key);
break;
}
}
}
}
void
Cache::removeRoom(const QString &roomid)
{
if (!isMounted_)
return;
auto txn = lmdb::txn::begin(env_, nullptr, 0);
lmdb::dbi_del(txn, roomDb_, lmdb::val(roomid.toUtf8(), roomid.toUtf8().size()), nullptr);
txn.commit();
}
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void
Cache::removeInvite(const QString &room_id)
{
if (!isMounted_)
return;
auto txn = lmdb::txn::begin(env_, nullptr, 0);
lmdb::dbi_del(
txn, invitesDb_, lmdb::val(room_id.toUtf8(), room_id.toUtf8().size()), nullptr);
txn.commit();
}
void
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Cache::states()
{
std::map<QString, RoomState> states;
auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
auto cursor = lmdb::cursor::open(txn, roomDb_);
std::string room;
std::string stateData;
// Retrieve all the room names.
while (cursor.get(room, stateData, MDB_NEXT)) {
auto roomid = QString::fromUtf8(room.data(), room.size());
auto json = nlohmann::json::parse(stateData);
RoomState state;
state.parse(json);
auto memberDb = lmdb::dbi::open(txn, roomid.toStdString().c_str(), MDB_CREATE);
std::map<std::string, mtx::events::StateEvent<mtx::events::state::Member>> members;
auto memberCursor = lmdb::cursor::open(txn, memberDb);
std::string memberId;
std::string memberContent;
while (memberCursor.get(memberId, memberContent, MDB_NEXT)) {
auto userid = QString::fromStdString(memberId);
try {
auto data = nlohmann::json::parse(memberContent);
mtx::events::StateEvent<mtx::events::state::Member> member = data;
members.emplace(memberId, member);
} catch (std::exception &e) {
qWarning() << "Fault while parsing member event" << e.what()
<< QString::fromStdString(memberContent);
continue;
}
}
qDebug() << members.size() << "members for" << roomid;
state.memberships = members;
states.emplace(roomid, std::move(state));
}
qDebug() << "Retrieved" << states.size() << "rooms";
cursor.close();
txn.commit();
emit statesLoaded(states);
}
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void
Cache::setNextBatchToken(lmdb::txn &txn, const QString &token)
{
auto value = token.toUtf8();
lmdb::dbi_put(txn, stateDb_, NEXT_BATCH_KEY, lmdb::val(value.data(), value.size()));
}
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bool
Cache::isInitialized() const
{
auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
lmdb::val token;
bool res = lmdb::dbi_get(txn, stateDb_, NEXT_BATCH_KEY, token);
txn.commit();
return res;
}
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QString
Cache::nextBatchToken() const
{
auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
lmdb::val token;
lmdb::dbi_get(txn, stateDb_, NEXT_BATCH_KEY, token);
txn.commit();
return QString::fromUtf8(token.data(), token.size());
}
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void
Cache::deleteData()
{
qInfo() << "Deleting cache data";
if (!cacheDirectory_.isEmpty())
QDir(cacheDirectory_).removeRecursively();
}
bool
Cache::isFormatValid()
{
auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
lmdb::val current_version;
bool res = lmdb::dbi_get(txn, stateDb_, CACHE_FORMAT_VERSION_KEY, current_version);
txn.commit();
if (!res)
return false;
std::string stored_version(current_version.data(), current_version.size());
if (stored_version != CURRENT_CACHE_FORMAT_VERSION) {
qWarning() << "Stored format version" << QString::fromStdString(stored_version);
qWarning() << "There are breaking changes in the cache format.";
return false;
}
return true;
}
void
Cache::setCurrentFormat()
{
auto txn = lmdb::txn::begin(env_);
lmdb::dbi_put(
txn,
stateDb_,
CACHE_FORMAT_VERSION_KEY,
lmdb::val(CURRENT_CACHE_FORMAT_VERSION.data(), CURRENT_CACHE_FORMAT_VERSION.size()));
txn.commit();
}
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std::map<std::string, mtx::responses::InvitedRoom>
Cache::invites()
{
std::map<std::string, mtx::responses::InvitedRoom> invites;
auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
auto cursor = lmdb::cursor::open(txn, invitesDb_);
std::string room_id;
std::string payload;
mtx::responses::InvitedRoom state;
while (cursor.get(room_id, payload, MDB_NEXT)) {
state = nlohmann::json::parse(payload);
invites.emplace(room_id, state);
}
if (invites.size() > 0)
qDebug() << "Retrieved" << invites.size() << "invites";
cursor.close();
txn.commit();
return invites;
}
void
Cache::setInvites(const std::map<std::string, mtx::responses::InvitedRoom> &invites)
{
if (!isMounted_)
return;
try {
auto txn = lmdb::txn::begin(env_);
for (auto it = invites.cbegin(); it != invites.cend(); ++it) {
nlohmann::json j;
for (const auto &e : it->second.invite_state) {
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mpark::visit(
[&j](auto msg) { j["invite_state"]["events"].push_back(msg); },
e);
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}
lmdb::dbi_put(txn, invitesDb_, lmdb::val(it->first), lmdb::val(j.dump()));
}
txn.commit();
} catch (const lmdb::error &e) {
qCritical() << "setInvitedRooms: " << e.what();
unmount();
}
}
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CachedReceipts
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Cache::readReceipts(const QString &event_id, const QString &room_id)
{
CachedReceipts receipts;
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ReadReceiptKey receipt_key{event_id.toStdString(), room_id.toStdString()};
nlohmann::json json_key = receipt_key;
try {
auto txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
auto key = json_key.dump();
lmdb::val value;
bool res =
lmdb::dbi_get(txn, readReceiptsDb_, lmdb::val(key.data(), key.size()), value);
txn.commit();
if (res) {
auto json_response = json::parse(std::string(value.data(), value.size()));
auto values = json_response.get<std::map<std::string, uint64_t>>();
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for (const auto &v : values)
// timestamp, user_id
receipts.emplace(v.second, v.first);
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}
} catch (const lmdb::error &e) {
qCritical() << "readReceipts:" << e.what();
}
return receipts;
}
void
Cache::updateReadReceipt(const std::string &room_id, const Receipts &receipts)
{
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for (const auto &receipt : receipts) {
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const auto event_id = receipt.first;
auto event_receipts = receipt.second;
ReadReceiptKey receipt_key{event_id, room_id};
nlohmann::json json_key = receipt_key;
try {
auto read_txn = lmdb::txn::begin(env_, nullptr, MDB_RDONLY);
const auto key = json_key.dump();
lmdb::val prev_value;
bool exists = lmdb::dbi_get(
read_txn, readReceiptsDb_, lmdb::val(key.data(), key.size()), prev_value);
read_txn.commit();
std::map<std::string, uint64_t> saved_receipts;
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// If an entry for the event id already exists, we would
// merge the existing receipts with the new ones.
if (exists) {
auto json_value =
json::parse(std::string(prev_value.data(), prev_value.size()));
// Retrieve the saved receipts.
saved_receipts = json_value.get<std::map<std::string, uint64_t>>();
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}
// Append the new ones.
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for (const auto &event_receipt : event_receipts)
saved_receipts.emplace(event_receipt.first, event_receipt.second);
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// Save back the merged (or only the new) receipts.
nlohmann::json json_updated_value = saved_receipts;
std::string merged_receipts = json_updated_value.dump();
auto txn = lmdb::txn::begin(env_);
lmdb::dbi_put(txn,
readReceiptsDb_,
lmdb::val(key.data(), key.size()),
lmdb::val(merged_receipts.data(), merged_receipts.size()));
txn.commit();
} catch (const lmdb::error &e) {
qCritical() << "updateReadReceipts:" << e.what();
}
}
}