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paginate.cpp
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paginate.cpp
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/*
* This file is part of libkazv.
* SPDX-FileCopyrightText: 2020 Tusooa Zhu
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#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 <status-utils.hpp>
#include "paginate.hpp"
namespace Kazv
{
ClientResult updateClient(ClientModel m, PaginateTimelineAction a)
{
auto roomId = a.roomId;
auto room = m.roomList.at(roomId);
if (! room.timelineGaps.find(a.fromEventId)) {
kzo.client.dbg() << "There is no such gap at " << a.fromEventId << std::endl;
return {
std::move(m),
returnEffect(EffectStatus(/* succ = */ false, json{
{"errorCode", "MOE_KAZV_MXC_KAZV_NO_SUCH_GAP"},
{"error", "No such gap"},
}))
};
}
auto paginateBackToken = room.timelineGaps[a.fromEventId];
auto job = m.job<GetRoomEventsJob>().make(
roomId,
paginateBackToken, // from
"b"s, // dir
std::nullopt, // to
a.limit).withData(json{{"roomId", roomId},
{"gapEventId", a.fromEventId}});
m.addJob(std::move(job));
return { m, lager::noop };
}
ClientResult processResponse(ClientModel m, GetRoomEventsResponse r)
{
auto roomId = r.dataStr("roomId");
auto gapEventId = r.dataStr("gapEventId");
if (! r.success()) {
kzo.client.dbg() << "Get room events failed" << std::endl;
m.addTrigger(PaginateFailed{roomId});
return { m, failWithResponse(r) };
}
auto paginateBackToken = r.end();
auto chunk = r.chunk();
try {
// kzo.client.dbg() << "We got " << chunk.size() << " events here" << std::endl;
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);
AddToTimelineAction action
{events.persistent(), paginateBackToken, std::nullopt, gapEventId};
m.roomList = RoomListModel::update(
std::move(m.roomList),
UpdateRoomAction{roomId, action});
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), simpleFail };
}
}
}

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