tdesktop/Telegram/SourceFiles/history/history_user_photos.cpp

251 lines
6.6 KiB
C++

/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop 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.
It 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.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#include "history/history_user_photos.h"
#include "auth_session.h"
#include "apiwrap.h"
#include "storage/storage_facade.h"
#include "storage/storage_user_photos.h"
class UserPhotosSliceBuilder {
public:
using Key = UserPhotosSlice::Key;
UserPhotosSliceBuilder(Key key, int limitBefore, int limitAfter);
bool applyUpdate(const Storage::UserPhotosResult &update);
bool applyUpdate(const Storage::UserPhotosSliceUpdate &update);
void checkInsufficientPhotos();
rpl::producer<PhotoId> insufficientPhotosAround() const {
return _insufficientPhotosAround.events();
}
UserPhotosSlice snapshot() const;
private:
void mergeSliceData(
base::optional<int> count,
const std::deque<PhotoId> &photoIds,
base::optional<int> skippedBefore,
int skippedAfter);
void sliceToLimits();
Key _key;
std::deque<PhotoId> _ids;
base::optional<int> _fullCount;
base::optional<int> _skippedBefore;
int _skippedAfter = 0;
int _limitBefore = 0;
int _limitAfter = 0;
rpl::event_stream<PhotoId> _insufficientPhotosAround;
};
UserPhotosSlice::UserPhotosSlice(Key key) : UserPhotosSlice(
key,
{},
base::none,
base::none,
0) {
}
UserPhotosSlice::UserPhotosSlice(
Key key,
const std::deque<PhotoId> &ids,
base::optional<int> fullCount,
base::optional<int> skippedBefore,
int skippedAfter)
: _key(key)
, _ids(ids)
, _fullCount(fullCount)
, _skippedBefore(skippedBefore)
, _skippedAfter(skippedAfter) {
}
base::optional<int> UserPhotosSlice::indexOf(PhotoId photoId) const {
auto it = base::find(_ids, photoId);
if (it != _ids.end()) {
return (it - _ids.begin());
}
return base::none;
}
PhotoId UserPhotosSlice::operator[](int index) const {
Expects(index >= 0 && index < size());
return *(_ids.begin() + index);
}
base::optional<int> UserPhotosSlice::distance(const Key &a, const Key &b) const {
if (a.userId != _key.userId
|| b.userId != _key.userId) {
return base::none;
}
if (auto i = indexOf(a.photoId)) {
if (auto j = indexOf(b.photoId)) {
return *j - *i;
}
}
return base::none;
}
QString UserPhotosSlice::debug() const {
auto before = _skippedBefore
? (*_skippedBefore
? ('(' + QString::number(*_skippedBefore) + ").. ")
: QString())
: QString(".. ");
auto after = _skippedAfter
? (" ..(" + QString::number(_skippedAfter) + ')')
: QString(" ..");
auto middle = (size() > 2)
? QString::number((*this)[0]) + " .. " + QString::number((*this)[size() - 1])
: (size() > 1)
? QString::number((*this)[0]) + ' ' + QString::number((*this)[1])
: ((size() > 0) ? QString::number((*this)[0]) : QString());
return before + middle + after;
}
UserPhotosSliceBuilder::UserPhotosSliceBuilder(
Key key,
int limitBefore,
int limitAfter)
: _key(key)
, _limitBefore(limitBefore)
, _limitAfter(limitAfter) {
}
bool UserPhotosSliceBuilder::applyUpdate(const Storage::UserPhotosResult &update) {
mergeSliceData(
update.count,
update.photoIds,
update.skippedBefore,
update.skippedAfter);
return true;
}
bool UserPhotosSliceBuilder::applyUpdate(const Storage::UserPhotosSliceUpdate &update) {
if (update.userId != _key.userId) {
return false;
}
auto idsCount = update.photoIds ? int(update.photoIds->size()) : 0;
mergeSliceData(
update.count,
update.photoIds ? *update.photoIds : std::deque<PhotoId> {},
update.count | func::add(-idsCount),
0);
return true;
}
void UserPhotosSliceBuilder::checkInsufficientPhotos() {
sliceToLimits();
}
void UserPhotosSliceBuilder::mergeSliceData(
base::optional<int> count,
const std::deque<PhotoId> &photoIds,
base::optional<int> skippedBefore,
int skippedAfter) {
if (photoIds.empty()) {
if (_fullCount != count) {
_fullCount = count;
if (_fullCount && *_fullCount <= _ids.size()) {
_fullCount = _ids.size();
_skippedBefore = _skippedAfter = 0;
}
}
} else {
if (count) {
_fullCount = count;
}
_skippedAfter = skippedAfter;
_ids = photoIds;
if (_fullCount) {
_skippedBefore = *_fullCount
- _skippedAfter
- int(_ids.size());
}
}
sliceToLimits();
}
void UserPhotosSliceBuilder::sliceToLimits() {
auto aroundIt = base::find(_ids, _key.photoId);
auto removeFromBegin = (aroundIt - _ids.begin() - _limitBefore);
auto removeFromEnd = (_ids.end() - aroundIt - _limitAfter - 1);
if (removeFromEnd > 0) {
_ids.erase(_ids.end() - removeFromEnd, _ids.end());
_skippedAfter += removeFromEnd;
}
if (removeFromBegin > 0) {
_ids.erase(_ids.begin(), _ids.begin() + removeFromBegin);
if (_skippedBefore) {
*_skippedBefore += removeFromBegin;
}
} else if (removeFromBegin < 0 && (!_skippedBefore || *_skippedBefore > 0)) {
_insufficientPhotosAround.fire(_ids.empty() ? 0 : _ids.front());
}
}
UserPhotosSlice UserPhotosSliceBuilder::snapshot() const {
return UserPhotosSlice(_key, _ids, _fullCount, _skippedBefore, _skippedAfter);
}
rpl::producer<UserPhotosSlice> UserPhotosViewer(
UserPhotosSlice::Key key,
int limitBefore,
int limitAfter) {
return [key, limitBefore, limitAfter](auto consumer) {
auto lifetime = rpl::lifetime();
auto builder = lifetime.make_state<UserPhotosSliceBuilder>(
key,
limitBefore,
limitAfter);
auto applyUpdate = [=](auto &&update) {
if (builder->applyUpdate(std::forward<decltype(update)>(update))) {
consumer.put_next(builder->snapshot());
}
};
auto requestPhotosAround = [user = App::user(key.userId)](
PhotoId photoId) {
Auth().api().requestUserPhotos(user, photoId);
};
builder->insufficientPhotosAround()
| rpl::start(requestPhotosAround, lifetime);
Auth().storage().userPhotosSliceUpdated()
| rpl::start(applyUpdate, lifetime);
Auth().storage().query(Storage::UserPhotosQuery(
key,
limitBefore,
limitAfter))
| rpl::start(
applyUpdate,
[=] { builder->checkInsufficientPhotos(); },
lifetime);
return lifetime;
};
}