main-db.cpp

/*
 * main-db.cpp
 * Copyright (C) 2010-2017 Belledonne Communications SARL
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include <algorithm>
#include <ctime>

#undef SOCI_ENABLED

#ifdef SOCI_ENABLED
	#include <soci/soci.h>
#endif // ifdef SOCI_ENABLED

#include "linphone/utils/utils.h"

#include "chat/chat-message/chat-message-p.h"
#include "chat/chat-room/chat-room.h"
#include "chat/chat-room/client-group-chat-room.h"
#include "conference/participant.h"
#include "content/content-type.h"
#include "content/content.h"
#include "core/core-p.h"
#include "db/session/db-session-provider.h"
#include "event-log/event-log-p.h"
#include "event-log/events.h"
#include "logger/logger.h"
#include "main-db-event-key-p.h"
#include "main-db-p.h"

// =============================================================================

using namespace std;

LINPHONE_BEGIN_NAMESPACE

// -----------------------------------------------------------------------------

MainDb::MainDb (const shared_ptr<Core> &core) : AbstractDb(*new MainDbPrivate), CoreAccessor(core) {}

#ifdef SOCI_ENABLED

// -----------------------------------------------------------------------------
// Soci backend.
// -----------------------------------------------------------------------------

	template<typename T>
	struct EnumToSql {
		T first;
		const char *second;
	};

	template<typename T>
	static constexpr const char *mapEnumToSql (const EnumToSql<T> enumToSql[], size_t n, T key) {
		return n == 0 ? "" : (
			enumToSql[n - 1].first == key ? enumToSql[n - 1].second : mapEnumToSql(enumToSql, n - 1, key)
		);
	}

	static constexpr EnumToSql<MainDb::Filter> eventFilterToSql[] = {
		{ MainDb::ConferenceCallFilter, "3, 4" },
		{ MainDb::ConferenceChatMessageFilter, "5" },
		{ MainDb::ConferenceInfoFilter, "1, 2, 6, 7, 8, 9, 10, 11, 12" }
	};

	static constexpr const char *mapEventFilterToSql (MainDb::Filter filter) {
		return mapEnumToSql(
			eventFilterToSql, sizeof eventFilterToSql / sizeof eventFilterToSql[0], filter
		);
	}

// -----------------------------------------------------------------------------

	static string buildSqlEventFilter (
		const list<MainDb::Filter> &filters,
		MainDb::FilterMask mask,
		const string &condKeyWord = "WHERE"
	) {
		L_ASSERT(
			find_if(filters.cbegin(), filters.cend(), [](const MainDb::Filter &filter) {
				return filter == MainDb::NoFilter;
			}) == filters.cend()
		);

		if (mask == MainDb::NoFilter)
			return "";

		bool isStart = true;
		string sql;
		for (const auto &filter : filters) {
			if (!(mask & filter))
				continue;

			if (isStart) {
				isStart = false;
				sql += " " + condKeyWord + " type IN (";
			} else
				sql += ", ";
			sql += mapEventFilterToSql(filter);
		}

		if (!isStart)
			sql += ") ";

		return sql;
	}

// -----------------------------------------------------------------------------

	long long MainDbPrivate::insertSipAddress (const string &sipAddress) {
		L_Q();
		soci::session *session = dbSession.getBackendSession<soci::session>();

		long long id;
		*session << "SELECT id FROM sip_address WHERE value = :sipAddress", soci::use(sipAddress), soci::into(id);
		if (session->got_data())
			return id;

		lInfo() << "Insert new sip address in database: `" << sipAddress << "`.";
		*session << "INSERT INTO sip_address (value) VALUES (:sipAddress)", soci::use(sipAddress);
		return q->getLastInsertId();
	}

	void MainDbPrivate::insertContent (long long eventId, const Content &content) {
		L_Q();
		soci::session *session = dbSession.getBackendSession<soci::session>();

		long long contentTypeId = insertContentType(content.getContentType().asString());
		*session << "INSERT INTO chat_message_content (event_id, content_type_id, body) VALUES"
			"  (:eventId, :contentTypeId, :body)", soci::use(eventId), soci::use(contentTypeId),
			soci::use(content.getBodyAsString());

		long long messageContentId = q->getLastInsertId();
		for (const auto &appData : content.getAppDataMap())
			*session << "INSERT INTO chat_message_content_app_data (chat_message_content_id, name, data) VALUES"
				"  (:messageContentId, :name, :data)",
				soci::use(messageContentId), soci::use(appData.first), soci::use(appData.second);
	}

	long long MainDbPrivate::insertContentType (const string &contentType) {
		L_Q();
		soci::session *session = dbSession.getBackendSession<soci::session>();

		long long id;
		*session << "SELECT id FROM content_type WHERE value = :contentType", soci::use(contentType), soci::into(id);
		if (session->got_data())
			return id;

		lInfo() << "Insert new content type in database: `" << contentType << "`.";
		*session << "INSERT INTO content_type (value) VALUES (:contentType)", soci::use(contentType);
		return q->getLastInsertId();
	}

	long long MainDbPrivate::insertChatRoom (long long sipAddressId, int capabilities, const tm &date) {
		soci::session *session = dbSession.getBackendSession<soci::session>();

		long long id;
		*session << "SELECT peer_sip_address_id FROM chat_room WHERE peer_sip_address_id = :sipAddressId",
			soci::use(sipAddressId), soci::into(id);
		if (!session->got_data()) {
			lInfo() << "Insert new chat room in database: `" << sipAddressId << "` (capabilities=" << capabilities << ").";
			*session << "INSERT INTO chat_room (peer_sip_address_id, creation_date, last_update_date, capabilities, subject) VALUES"
				"  (:sipAddressId, :creationDate, :lastUpdateDate, :capabilities, '')",
				soci::use(sipAddressId), soci::use(date), soci::use(date), soci::use(capabilities);
		}
		else
			*session << "UPDATE chat_room SET last_update_date = :lastUpdateDate WHERE peer_sip_address_id = :sipAddressId",
				soci::use(date), soci::use(sipAddressId);

		return sipAddressId;
	}

	void MainDbPrivate::insertChatRoomParticipant (long long chatRoomId, long long sipAddressId, bool isAdmin) {
		soci::session *session = dbSession.getBackendSession<soci::session>();
		soci::statement statement = (
			session->prepare << "UPDATE chat_room_participant SET is_admin = :isAdmin"
				"  WHERE chat_room_id = :chatRoomId AND sip_address_id = :sipAddressId",
				soci::use(static_cast<int>(isAdmin)), soci::use(chatRoomId), soci::use(sipAddressId)
		);
		statement.execute(true);
		if (statement.get_affected_rows() == 0) {
			lInfo() << "Insert new chat room participant in database: `" << sipAddressId << "` (isAdmin=" << isAdmin << ").";
			*session << "INSERT INTO chat_room_participant (chat_room_id, sip_address_id, is_admin)"
				"  VALUES (:chatRoomId, :sipAddressId, :isAdmin)",
				soci::use(chatRoomId), soci::use(sipAddressId), soci::use(static_cast<int>(isAdmin));
		}
	}

	void MainDbPrivate::insertChatMessageParticipant (long long eventId, long long sipAddressId, int state) {
		soci::session *session = dbSession.getBackendSession<soci::session>();
		soci::statement statement = (
			session->prepare << "UPDATE chat_message_participant SET state = :state"
				"  WHERE event_id = :eventId AND sip_address_id = :sipAddressId",
				soci::use(state), soci::use(eventId), soci::use(sipAddressId)
		);
		statement.execute(true);
		if (statement.get_affected_rows() == 0 && state != static_cast<int>(ChatMessage::State::Displayed))
			*session << "INSERT INTO chat_message_participant (event_id, sip_address_id, state)"
				"  VALUES (:eventId, :sipAddressId, :state)",
				soci::use(eventId), soci::use(sipAddressId), soci::use(state);
	}

// -----------------------------------------------------------------------------

	shared_ptr<EventLog> MainDbPrivate::selectGenericConferenceEvent (
		long long eventId,
		EventLog::Type type,
		time_t date,
		const string &peerAddress
	) const {
		switch (type) {
			case EventLog::Type::None:
				return nullptr;

			case EventLog::Type::ConferenceCreated:
			case EventLog::Type::ConferenceDestroyed:
				return selectConferenceEvent(eventId, type, date, peerAddress);

			case EventLog::Type::ConferenceCallStart:
			case EventLog::Type::ConferenceCallEnd:
				return selectConferenceCallEvent(eventId, type, date, peerAddress);

			case EventLog::Type::ConferenceChatMessage:
				return selectConferenceChatMessageEvent(eventId, type, date, peerAddress);

			case EventLog::Type::ConferenceParticipantAdded:
			case EventLog::Type::ConferenceParticipantRemoved:
			case EventLog::Type::ConferenceParticipantSetAdmin:
			case EventLog::Type::ConferenceParticipantUnsetAdmin:
				return selectConferenceParticipantEvent(eventId, type, date, peerAddress);

			case EventLog::Type::ConferenceParticipantDeviceAdded:
			case EventLog::Type::ConferenceParticipantDeviceRemoved:
				return selectConferenceParticipantDeviceEvent(eventId, type, date, peerAddress);

			case EventLog::Type::ConferenceSubjectChanged:
				return selectConferenceSubjectEvent(eventId, type, date, peerAddress);
		}

		return nullptr;
	}

	shared_ptr<EventLog> MainDbPrivate::selectConferenceEvent (
		long long,
		EventLog::Type type,
		time_t date,
		const string &peerAddress
	) const {
		return make_shared<ConferenceEvent>(
			type,
			date,
			Address(peerAddress)
		);
	}

	shared_ptr<EventLog> MainDbPrivate::selectConferenceCallEvent (
		long long eventId,
		EventLog::Type type,
		time_t date,
		const string &peerAddress
	) const {
		// TODO.
		return nullptr;
	}

	shared_ptr<EventLog> MainDbPrivate::selectConferenceChatMessageEvent (
		long long eventId,
		EventLog::Type type,
		time_t date,
		const string &peerAddress
	) const {
		L_Q();

		shared_ptr<Core> core = q->getCore();

		// TODO: Avoid address creation.
		shared_ptr<ChatRoom> chatRoom = core->findChatRoom(Address(peerAddress));
		if (!chatRoom)
			return nullptr;

		// TODO: Use cache, do not fetch the same message twice.

		// 1 - Fetch chat message.
		shared_ptr<ChatMessage> chatMessage = make_shared<ChatMessage>(chatRoom);
		{
			string localSipAddress;
			string remoteSipAddress;
			string imdnMessageId;
			int state;
			int direction;
			int isSecured;

			soci::session *session = dbSession.getBackendSession<soci::session>();
			*session << "SELECT local_sip_address.value, remote_sip_address.value, imdn_message_id, state, direction, is_secured"
				"  FROM event, conference_chat_message_event, sip_address AS local_sip_address,"
				"  sip_address AS remote_sip_address"
				"  WHERE event_id = :eventId"
				"  AND event_id = event.id"
				"  AND local_sip_address_id = local_sip_address.id"
				"  AND remote_sip_address_id = remote_sip_address.id", soci::into(localSipAddress), soci::into(remoteSipAddress),
				soci::into(imdnMessageId), soci::into(state), soci::into(direction), soci::into(isSecured), soci::use(eventId);

			chatMessage->getPrivate()->setState(static_cast<ChatMessage::State>(state), true);
			chatMessage->getPrivate()->setDirection(static_cast<ChatMessage::Direction>(direction));
			chatMessage->setIsSecured(static_cast<bool>(isSecured));

			if (direction == static_cast<int>(ChatMessage::Direction::Outgoing)) {
				chatMessage->setFromAddress(Address(localSipAddress));
				chatMessage->setToAddress(Address(remoteSipAddress));
			} else {
				chatMessage->setFromAddress(Address(remoteSipAddress));
				chatMessage->setToAddress(Address(localSipAddress));
			}
		}

		// 2 - Fetch contents.
		{
			soci::session *session = dbSession.getBackendSession<soci::session>();
			const string query = "SELECT content_type.value, body FROM chat_message_content, content_type"
				"  WHERE event_id = :eventId AND content_type_id = content_type.id";
			soci::rowset<soci::row> rows = (session->prepare << query, soci::use(eventId));
			for (const auto &row : rows) {
				ContentType contentType(row.get<string>(1));
				Content *content;

				if (contentType == ContentType::FileTransfer)
					content = new FileTransferContent();
				else if (contentType.isFile()) {
					long long contentId = q->getBackend() == AbstractDb::Sqlite3
						? static_cast<long long>(row.get<int>(0))
						: row.get<long long>(0);

					string name;
					int size;
					string path;

					*session << "SELECT name, size, path FROM chat_message_file_content"
						"  WHERE chat_message_content_id = :contentId",
						soci::into(name), soci::into(size), soci::into(path), soci::use(contentId);

					FileContent *fileContent = new FileContent();
					fileContent->setFileName(name);
					fileContent->setFileSize(static_cast<size_t>(size));
					fileContent->setFilePath(path);

					content = fileContent;
				} else
					content = new Content();

				content->setContentType(contentType);
				content->setBody(row.get<string>(2));
				chatMessage->addContent(content);
			}
		}

		// TODO: Use cache.
		return make_shared<ConferenceChatMessageEvent>(
			date,
			chatMessage
		);
	}

	shared_ptr<EventLog> MainDbPrivate::selectConferenceParticipantEvent (
		long long eventId,
		EventLog::Type type,
		time_t date,
		const string &peerAddress
	) const {
		unsigned int notifyId;
		string participantAddress;

		soci::session *session = dbSession.getBackendSession<soci::session>();
		*session << "SELECT notify_id, participant_address.value"
			"  FROM conference_notified_event, conference_participant_event, sip_address as participant_address"
			"  WHERE conference_participant_event.event_id = :eventId"
			"    AND conference_notified_event.event_id = conference_participant_event.event_id"
			"    AND participant_address.id = participant_address_id",
			soci::into(notifyId), soci::into(participantAddress), soci::use(eventId);

		return make_shared<ConferenceParticipantEvent>(
			type,
			date,
			Address(peerAddress),
			notifyId,
			Address(participantAddress)
		);
	}

	shared_ptr<EventLog> MainDbPrivate::selectConferenceParticipantDeviceEvent (
		long long eventId,
		EventLog::Type type,
		time_t date,
		const string &peerAddress
	) const {
		unsigned int notifyId;
		string participantAddress;
		string gruuAddress;

		soci::session *session = dbSession.getBackendSession<soci::session>();
		*session << "SELECT notify_id, participant_address.value, gruu_address.value"
			"  FROM conference_notified_event, conference_participant_event, conference_participant_device_event,"
			"    sip_address AS participant_address, sip_address AS gruu_address"
			"  WHERE conference_participant_device_event.event_id = :eventId"
			"    AND conference_participant_event.event_id = conference_participant_device_event.event_id"
			"    AND conference_notified_event.event_id = conference_participant_event.event_id"
			"    AND participant_address.id = participant_address_id"
			"    AND gruu_address.id = gruu_address_id",
			soci::into(notifyId), soci::into(participantAddress), soci::into(gruuAddress), soci::use(eventId);

		return make_shared<ConferenceParticipantDeviceEvent>(
			type,
			date,
			Address(peerAddress),
			notifyId,
			Address(participantAddress),
			Address(gruuAddress)
		);
	}

	shared_ptr<EventLog> MainDbPrivate::selectConferenceSubjectEvent (
		long long eventId,
		EventLog::Type type,
		time_t date,
		const string &peerAddress
	) const {
		unsigned int notifyId;
		string subject;

		soci::session *session = dbSession.getBackendSession<soci::session>();
		*session << "SELECT notify_id, subject"
			"  FROM conference_notified_event, conference_subject_event"
			"  WHERE conference_subject_event.event_id = :eventId"
			"    AND conference_notified_event.event_id = conference_subject_event.event_id",
			soci::into(notifyId), soci::into(subject), soci::use(eventId);

		return make_shared<ConferenceSubjectEvent>(
			date,
			Address(peerAddress),
			notifyId,
			subject
		);
	}

// -----------------------------------------------------------------------------

	long long MainDbPrivate::insertEvent (const shared_ptr<EventLog> &eventLog) {
		L_Q();
		soci::session *session = dbSession.getBackendSession<soci::session>();

		*session << "INSERT INTO event (type, date) VALUES (:type, :date)",
		soci::use(static_cast<int>(eventLog->getType())), soci::use(Utils::getTimeTAsTm(eventLog->getTime()));
		return q->getLastInsertId();
	}

	long long MainDbPrivate::insertConferenceEvent (const shared_ptr<EventLog> &eventLog, long long *chatRoomId) {
		long long eventId = insertEvent(eventLog);
		long long curChatRoomId = insertSipAddress(
			static_pointer_cast<ConferenceEvent>(eventLog)->getConferenceAddress().asString()
		);

		soci::session *session = dbSession.getBackendSession<soci::session>();
		*session << "INSERT INTO conference_event (event_id, chat_room_id)"
			"  VALUES (:eventId, :chatRoomId)", soci::use(eventId), soci::use(curChatRoomId);

		if (chatRoomId)
			*chatRoomId = curChatRoomId;

		return eventId;
	}

	long long MainDbPrivate::insertConferenceCallEvent (const shared_ptr<EventLog> &eventLog) {
		// TODO.
		return 0;
	}

	long long MainDbPrivate::insertConferenceChatMessageEvent (const shared_ptr<EventLog> &eventLog) {
		shared_ptr<ChatMessage> chatMessage = static_pointer_cast<ConferenceChatMessageEvent>(eventLog)->getChatMessage();
		shared_ptr<ChatRoom> chatRoom = chatMessage->getChatRoom();
		if (!chatRoom) {
			lError() << "Unable to get a valid chat room. It was removed from database.";
			return -1;
		}

		tm eventTime = Utils::getTimeTAsTm(eventLog->getTime());

		long long localSipAddressId = insertSipAddress(chatMessage->getLocalAddress().asString());
		long long remoteSipAddressId = insertSipAddress(chatMessage->getRemoteAddress().asString());
		insertChatRoom(remoteSipAddressId, chatRoom->getCapabilities(), eventTime);
		long long eventId = insertConferenceEvent(eventLog);

		soci::session *session = dbSession.getBackendSession<soci::session>();

		*session << "INSERT INTO conference_chat_message_event ("
			"  event_id, local_sip_address_id, remote_sip_address_id,"
			"  state, direction, imdn_message_id, is_secured"
			") VALUES ("
			"  :eventId, :localSipaddressId, :remoteSipaddressId,"
			"  :state, :direction, :imdnMessageId, :isSecured"
			")", soci::use(eventId), soci::use(localSipAddressId), soci::use(remoteSipAddressId),
			soci::use(static_cast<int>(chatMessage->getState())), soci::use(static_cast<int>(chatMessage->getDirection())),
			soci::use(chatMessage->getImdnMessageId()), soci::use(chatMessage->isSecured() ? 1 : 0);

		for (const Content *content : chatMessage->getContents())
			insertContent(eventId, *content);

		return eventId;
	}

	long long MainDbPrivate::insertConferenceNotifiedEvent (const shared_ptr<EventLog> &eventLog) {
		long long chatRoomId;
		long long eventId = insertConferenceEvent(eventLog, &chatRoomId);
		unsigned int lastNotifyId = static_pointer_cast<ConferenceNotifiedEvent>(eventLog)->getNotifyId();

		soci::session *session = dbSession.getBackendSession<soci::session>();
		*session << "INSERT INTO conference_notified_event (event_id, notify_id)"
			"  VALUES (:eventId, :notifyId)", soci::use(eventId), soci::use(lastNotifyId);
		*session << "UPDATE chat_room SET last_notify_id = :lastNotifyId WHERE peer_sip_address_id = :chatRoomId",
			soci::use(lastNotifyId), soci::use(chatRoomId);

		return eventId;
	}

	long long MainDbPrivate::insertConferenceParticipantEvent (const shared_ptr<EventLog> &eventLog) {
		long long eventId = insertConferenceNotifiedEvent(eventLog);
		long long participantAddressId = insertSipAddress(
			static_pointer_cast<ConferenceParticipantEvent>(eventLog)->getParticipantAddress().asString()
		);

		soci::session *session = dbSession.getBackendSession<soci::session>();
		*session << "INSERT INTO conference_participant_event (event_id, participant_address_id)"
			"  VALUES (:eventId, :participantAddressId)", soci::use(eventId), soci::use(participantAddressId);

		return eventId;
	}

	long long MainDbPrivate::insertConferenceParticipantDeviceEvent (const shared_ptr<EventLog> &eventLog) {
		long long eventId = insertConferenceParticipantEvent(eventLog);
		long long gruuAddressId = insertSipAddress(
			static_pointer_cast<ConferenceParticipantDeviceEvent>(eventLog)->getGruuAddress().asString()
		);

		soci::session *session = dbSession.getBackendSession<soci::session>();
		*session << "INSERT INTO conference_participant_device_event (event_id, gruu_address_id)"
			"  VALUES (:eventId, :gruuAddressId)", soci::use(eventId), soci::use(gruuAddressId);

		return eventId;
	}

	long long MainDbPrivate::insertConferenceSubjectEvent (const shared_ptr<EventLog> &eventLog) {
		long long eventId = insertConferenceNotifiedEvent(eventLog);

		soci::session *session = dbSession.getBackendSession<soci::session>();
		*session << "INSERT INTO conference_subject_event (event_id, subject)"
			"  VALUES (:eventId, :subject)", soci::use(eventId), soci::use(
				static_pointer_cast<ConferenceSubjectEvent>(eventLog)->getSubject()
			);

		return eventId;
	}

// -----------------------------------------------------------------------------

	shared_ptr<EventLog> MainDbPrivate::getEventFromCache (long long eventId) const {
		auto it = storageIdToEvent.find(eventId);
		if (it == storageIdToEvent.cend())
			return nullptr;

		shared_ptr<EventLog> eventLog = it->second.lock();
		// Must exist. If not, implementation bug.
		L_ASSERT(eventLog);
		return eventLog;
	}

	void MainDbPrivate::invalidEventsFromQuery (const string &query, const string &peerAddress) {
		L_Q();

		soci::session *session = dbSession.getBackendSession<soci::session>();
		soci::rowset<soci::row> rows = (session->prepare << query, soci::use(peerAddress));
		for (const auto &row : rows) {
			shared_ptr<EventLog> eventLog = getEventFromCache(
				q->getBackend() == AbstractDb::Sqlite3 ? static_cast<long long>(row.get<int>(0)) : row.get<long long>(0)
			);
			if (eventLog) {
				const EventLogPrivate *dEventLog = eventLog->getPrivate();
				L_ASSERT(dEventLog->dbKey.isValid());
				dEventLog->dbKey = MainDbEventKey();
			}
		}
	}

// -----------------------------------------------------------------------------

	void MainDb::init () {
		L_D();

		const string charset = getBackend() == Mysql ? "DEFAULT CHARSET=utf8" : "";
		soci::session *session = d->dbSession.getBackendSession<soci::session>();

		*session <<
			"CREATE TABLE IF NOT EXISTS sip_address ("
			"  id" + primaryKeyStr("BIGINT UNSIGNED") + ","
			"  value VARCHAR(255) UNIQUE NOT NULL"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS content_type ("
			"  id" + primaryKeyStr("SMALLINT UNSIGNED") + ","
			"  value VARCHAR(255) UNIQUE NOT NULL"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS event ("
			"  id" + primaryKeyStr("BIGINT UNSIGNED") + ","
			"  type TINYINT UNSIGNED NOT NULL,"
			"  date DATE NOT NULL"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS chat_room ("
			// Server (for conference) or user sip address.
			"  peer_sip_address_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","

			"  local_sip_address_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","

			// Dialog creation date.
			"  creation_date DATE NOT NULL,"

			// Last event date (call, message...).
			"  last_update_date DATE NOT NULL,"

			// ConferenceChatRoom, BasicChatRoom, RTT...
			"capabilities TINYINT UNSIGNED,"

			// Chatroom subject.
			"  subject VARCHAR(255),"

			"  last_notify_id INT UNSIGNED,"

			"  PRIMARY KEY (peer_sip_address_id, local_sip_address_id),"
			"  FOREIGN KEY (peer_sip_address_id)"
			"    REFERENCES sip_address(id)"
			"    ON DELETE CASCADE"
			"  FOREIGN KEY (local_sip_address_id)"
			"    REFERENCES sip_address(id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS chat_room_participant ("
			"  chat_room_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","
			"  sip_address_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","

			"  is_admin BOOLEAN NOT NULL,"

			"  PRIMARY KEY (chat_room_id, sip_address_id),"
			"  FOREIGN KEY (chat_room_id)"
			"    REFERENCES chat_room(peer_sip_address_id)"
			"    ON DELETE CASCADE,"
			"  FOREIGN KEY (sip_address_id)"
			"    REFERENCES sip_address(id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS conference_event ("
			"  event_id" + primaryKeyStr("BIGINT UNSIGNED") + ","

			"  chat_room_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","

			"  FOREIGN KEY (event_id)"
			"    REFERENCES event(id)"
			"    ON DELETE CASCADE,"
			"  FOREIGN KEY (chat_room_id)"
			"    REFERENCES chat_room(peer_sip_address_id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS conference_notified_event ("
			"  event_id" + primaryKeyStr("BIGINT UNSIGNED") + ","

			"  notify_id INT UNSIGNED NOT NULL,"

			"  FOREIGN KEY (event_id)"
			"    REFERENCES conference_event(event_id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS conference_participant_event ("
			"  event_id" + primaryKeyStr("BIGINT UNSIGNED") + ","

			"  participant_address_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","

			"  FOREIGN KEY (event_id)"
			"    REFERENCES conference_notified_event(event_id)"
			"    ON DELETE CASCADE,"
			"  FOREIGN KEY (participant_address_id)"
			"    REFERENCES sip_address(id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS conference_participant_device_event ("
			"  event_id" + primaryKeyStr("BIGINT UNSIGNED") + ","

			"  gruu_address_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","

			"  FOREIGN KEY (event_id)"
			"    REFERENCES conference_participant_event(event_id)"
			"    ON DELETE CASCADE,"
			"  FOREIGN KEY (gruu_address_id)"
			"    REFERENCES sip_address(id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS conference_subject_event ("
			"  event_id" + primaryKeyStr("BIGINT") + ","

			"  subject VARCHAR(255) NOT NULL,"

			"  FOREIGN KEY (event_id)"
			"    REFERENCES conference_notified_event(event_id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS conference_chat_message_event ("
			"  event_id" + primaryKeyStr("BIGINT UNSIGNED") + ","

			"  local_sip_address_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","
			"  remote_sip_address_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","

			// See: https://tools.ietf.org/html/rfc5438#section-6.3
			"  imdn_message_id VARCHAR(255) NOT NULL,"

			"  state TINYINT UNSIGNED NOT NULL,"
			"  direction TINYINT UNSIGNED NOT NULL,"
			"  is_secured BOOLEAN NOT NULL,"

			"  FOREIGN KEY (event_id)"
			"    REFERENCES conference_event(event_id)"
			"    ON DELETE CASCADE,"
			"  FOREIGN KEY (local_sip_address_id)"
			"    REFERENCES sip_address(id)"
			"    ON DELETE CASCADE,"
			"  FOREIGN KEY (remote_sip_address_id)"
			"    REFERENCES sip_address(id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS chat_message_participant ("
			"  event_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","
			"  sip_address_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","
			"  state TINYINT UNSIGNED NOT NULL,"

			"  PRIMARY KEY (event_id, sip_address_id),"
			"  FOREIGN KEY (event_id)"
			"    REFERENCES conference_chat_message_event(event_id)"
			"    ON DELETE CASCADE,"
			"  FOREIGN KEY (sip_address_id)"
			"    REFERENCES sip_address(id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS chat_message_content ("
			"  id" + primaryKeyStr("BIGINT UNSIGNED") + ","

			"  event_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","
			"  content_type_id" + primaryKeyRefStr("SMALLINT UNSIGNED") + ","
			"  body TEXT NOT NULL,"

			"  FOREIGN KEY (event_id)"
			"    REFERENCES conference_chat_message_event(event_id)"
			"    ON DELETE CASCADE,"
			"  FOREIGN KEY (content_type_id)"
			"    REFERENCES content_type(id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS chat_message_file_content ("
			"  chat_message_content_id" + primaryKeyStr("BIGINT UNSIGNED") + ","

			"  name VARCHAR(256) NOT NULL,"
			"  size INT UNSIGNED NOT NULL,"
			"  path VARCHAR(512) NOT NULL,"

			"  FOREIGN KEY (chat_message_content_id)"
			"    REFERENCES chat_message_content(id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS chat_message_content_app_data ("
			"  chat_message_content_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","

			"  name VARCHAR(255),"
			"  data BLOB,"

			"  PRIMARY KEY (chat_message_content_id, name),"
			"  FOREIGN KEY (chat_message_content_id)"
			"    REFERENCES chat_message_content(id)"
			"    ON DELETE CASCADE"
			") " + charset;

		*session <<
			"CREATE TABLE IF NOT EXISTS conference_message_crypto_data ("
			"  event_id" + primaryKeyRefStr("BIGINT UNSIGNED") + ","

			"  name VARCHAR(255),"
			"  data BLOB,"

			"  PRIMARY KEY (event_id, name),"
			"  FOREIGN KEY (event_id)"
			"    REFERENCES conference_chat_message_event(event_id)"
			"    ON DELETE CASCADE"
			") " + charset;

		// Trigger to delete participant_message cache entries.
		string displayedId = Utils::toString(static_cast<int>(ChatMessage::State::Displayed));
		string participantMessageDeleter =
			"CREATE TRIGGER IF NOT EXISTS chat_message_participant_deleter"
			"  AFTER UPDATE OF state ON chat_message_participant FOR EACH ROW"
			"  WHEN NEW.state = ";
		participantMessageDeleter += displayedId;
		participantMessageDeleter += " AND (SELECT COUNT(*) FROM ("
			"    SELECT state FROM chat_message_participant WHERE"
			"    NEW.event_id = chat_message_participant.event_id"
			"    AND state <> ";
		participantMessageDeleter += displayedId;
		participantMessageDeleter += "    LIMIT 1"
			"  )) = 0"
			"  BEGIN"
			"  DELETE FROM chat_message_participant WHERE NEW.event_id = chat_message_participant.event_id;"
			"  UPDATE conference_chat_message_event SET state = ";
		participantMessageDeleter += displayedId;
		participantMessageDeleter += " WHERE event_id = NEW.event_id;"
			"  END";

		*session << participantMessageDeleter;
	}

	bool MainDb::addEvent (const shared_ptr<EventLog> &eventLog) {
		L_D();

		if (!isConnected()) {
			lWarning() << "Unable to add event. Not connected.";
			return false;
		}

		const EventLogPrivate *dEventLog = eventLog->getPrivate();
		if (dEventLog->dbKey.isValid()) {
			lWarning() << "Unable to add an event twice!!!";
			return false;
		}

		bool soFarSoGood = false;
		long long storageId;

		L_BEGIN_LOG_EXCEPTION

		soci::transaction tr(*d->dbSession.getBackendSession<soci::session>());

		switch (eventLog->getType()) {
			case EventLog::Type::None:
				return false;

			case EventLog::Type::ConferenceCreated:
			case EventLog::Type::ConferenceDestroyed:
				storageId = d->insertConferenceEvent(eventLog);
				break;

			case EventLog::Type::ConferenceCallStart:
			case EventLog::Type::ConferenceCallEnd:
				storageId = d->insertConferenceCallEvent(eventLog);
				break;

			case EventLog::Type::ConferenceChatMessage:
				storageId = d->insertConferenceChatMessageEvent(eventLog);
				break;

			case EventLog::Type::ConferenceParticipantAdded:
			case EventLog::Type::ConferenceParticipantRemoved:
			case EventLog::Type::ConferenceParticipantSetAdmin:
			case EventLog::Type::ConferenceParticipantUnsetAdmin:
				storageId = d->insertConferenceParticipantEvent(eventLog);
				break;

			case EventLog::Type::ConferenceParticipantDeviceAdded:
			case EventLog::Type::ConferenceParticipantDeviceRemoved:
				storageId = d->insertConferenceParticipantDeviceEvent(eventLog);
				break;

			case EventLog::Type::ConferenceSubjectChanged: