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paginate.cpp
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paginate.cpp
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/*
* Copyright (C) 2020 Tusooa Zhu
*
* This file is part of libkazv.
*
* libkazv is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* libkazv 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with libkazv. If not, see <https://www.gnu.org/licenses/>.
*/
#include <libkazv-config.hpp>
// eager requires tuplify but did not include it.
// This is a bug.
#include <zug/tuplify.hpp>
#include <zug/transducer/eager.hpp>
#include <zug/into.hpp>
#include <lager/util.hpp>
#include <types.hpp>
#include <debug.hpp>
#include <cursorutil.hpp>
#include "paginate.hpp"
namespace Kazv
{
ClientResult updateClient(ClientModel m, PaginateTimelineAction a)
{
auto roomId = a.roomId;
auto room = m.roomList.at(roomId);
auto paginateBackToken = room.paginateBackToken;
auto job = m.job<GetRoomEventsJob>().make(
roomId,
paginateBackToken, // from
"b"s, // dir
std::nullopt, // to
a.limit).withData(json{{"roomId", roomId}});
m.addJob(std::move(job));
return { m, lager::noop };
}
ClientResult processResponse(ClientModel m, GetRoomEventsResponse r)
{
auto roomId = r.dataStr("roomId");
if (! r.success()) {
kzo.client.dbg() << "Get room events failed" << std::endl;
m.addTrigger(PaginateFailed{roomId});
return { m, lager::noop };
}
auto paginateBackToken = r.end().value_or(DEFVAL);
auto chunk = r.chunk();
try {
auto room = m.roomList.at(roomId);
immer::flex_vector_transient<Event> events{};
// The timeline from paginate backwards is returned
// in reversed order, so restore the order.
zug::into(events, zug::reversed, chunk);
PrependTimelineAction action
{events.persistent(), paginateBackToken};
auto roomList = RoomListModel::update(
std::move(m.roomList),
UpdateRoomAction{roomId, action});
m.roomList = std::move(roomList);
m.addTrigger(PaginateSuccessful{roomId});
return { std::move(m), lager::noop };
} catch (const std::out_of_range &e) {
// Ignore it, the client model is modified
// such that it knows nothing about this room.
// May happen in debugger.
return { std::move(m), lager::noop };
}
}
}

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paginate.cpp (2 KB)

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