tdesktop/Telegram/SourceFiles/data/data_messages.cpp

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/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.
For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "data/data_feed_messages.h"
namespace Data {
MessagesList::Slice::Slice(
base::flat_set<MessagePosition> &&messages,
MessagesRange range)
: messages(std::move(messages))
, range(range) {
}
template <typename Range>
void MessagesList::Slice::merge(
const Range &moreMessages,
MessagesRange moreNoSkipRange) {
Expects(moreNoSkipRange.from <= range.till);
Expects(range.from <= moreNoSkipRange.till);
messages.merge(std::begin(moreMessages), std::end(moreMessages));
range = {
qMin(range.from, moreNoSkipRange.from),
qMax(range.till, moreNoSkipRange.till)
};
}
template <typename Range>
int MessagesList::uniteAndAdd(
MessagesSliceUpdate &update,
base::flat_set<Slice>::iterator uniteFrom,
base::flat_set<Slice>::iterator uniteTill,
const Range &messages,
MessagesRange noSkipRange) {
auto uniteFromIndex = uniteFrom - _slices.begin();
auto was = uniteFrom->messages.size();
_slices.modify(uniteFrom, [&](Slice &slice) {
slice.merge(messages, noSkipRange);
});
auto firstToErase = uniteFrom + 1;
if (firstToErase != uniteTill) {
for (auto it = firstToErase; it != uniteTill; ++it) {
_slices.modify(uniteFrom, [&](Slice &slice) {
slice.merge(it->messages, it->range);
});
}
_slices.erase(firstToErase, uniteTill);
uniteFrom = _slices.begin() + uniteFromIndex;
}
update.messages = &uniteFrom->messages;
update.range = uniteFrom->range;
return uniteFrom->messages.size() - was;
}
template <typename Range>
int MessagesList::addRangeItemsAndCountNew(
MessagesSliceUpdate &update,
const Range &messages,
MessagesRange noSkipRange) {
Expects(noSkipRange.from <= noSkipRange.till);
auto uniteFrom = ranges::lower_bound(
_slices,
noSkipRange.from,
std::less<>(),
[](const Slice &slice) { return slice.range.till; });
auto uniteTill = ranges::upper_bound(
_slices,
noSkipRange.till,
std::less<>(),
[](const Slice &slice) { return slice.range.from; });
if (uniteFrom < uniteTill) {
return uniteAndAdd(update, uniteFrom, uniteTill, messages, noSkipRange);
}
auto sliceMessages = base::flat_set<MessagePosition> {
std::begin(messages),
std::end(messages) };
auto slice = _slices.emplace(
std::move(sliceMessages),
noSkipRange);
update.messages = &slice->messages;
update.range = slice->range;
return slice->messages.size();
}
template <typename Range>
void MessagesList::addRange(
const Range &messages,
MessagesRange noSkipRange,
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std::optional<int> count,
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bool incrementCount) {
Expects(!count || !incrementCount);
auto wasCount = _count;
auto update = MessagesSliceUpdate();
auto result = addRangeItemsAndCountNew(
update,
messages,
noSkipRange);
if (count) {
_count = count;
} else if (incrementCount && _count && result > 0) {
*_count += result;
}
if (_slices.size() == 1) {
if (_slices.front().range == FullMessagesRange) {
_count = _slices.front().messages.size();
}
}
update.count = _count;
_sliceUpdated.fire(std::move(update));
}
void MessagesList::addNew(MessagePosition messageId) {
auto range = { messageId };
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addRange(range, { messageId, MaxMessagePosition }, std::nullopt, true);
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}
void MessagesList::addSlice(
std::vector<MessagePosition> &&messageIds,
MessagesRange noSkipRange,
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std::optional<int> count) {
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addRange(messageIds, noSkipRange, count);
}
void MessagesList::removeOne(MessagePosition messageId) {
auto slice = ranges::lower_bound(
_slices,
messageId,
std::less<>(),
[](const Slice &slice) { return slice.range.till; });
if (slice != _slices.end() && slice->range.from <= messageId) {
_slices.modify(slice, [&](Slice &slice) {
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return slice.messages.remove(messageId);
});
}
if (_count) {
--*_count;
}
}
void MessagesList::removeAll(ChannelId channelId) {
auto removed = 0;
for (auto i = begin(_slices); i != end(_slices); ++i) {
_slices.modify(i, [&](Slice &slice) {
auto &messages = slice.messages;
for (auto j = begin(messages); j != end(messages);) {
if (j->fullId.channel == channelId) {
j = messages.erase(j);
++removed;
} else {
++j;
}
}
});
}
if (removed && _count) {
*_count -= removed;
}
}
void MessagesList::invalidate() {
_slices.clear();
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_count = std::nullopt;
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}
void MessagesList::invalidateBottom() {
if (!_slices.empty()) {
const auto &last = _slices.back();
if (last.range.till == MaxMessagePosition) {
_slices.modify(_slices.end() - 1, [](Slice &slice) {
slice.range.till = slice.messages.empty()
? slice.range.from
: slice.messages.back();
});
}
}
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_count = std::nullopt;
}
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rpl::producer<MessagesResult> MessagesList::query(
MessagesQuery &&query) const {
return [this, query = std::move(query)](auto consumer) {
auto slice = query.aroundId
? ranges::lower_bound(
_slices,
query.aroundId,
std::less<>(),
[](const Slice &slice) { return slice.range.till; })
: _slices.end();
if (slice != _slices.end()
&& slice->range.from <= query.aroundId) {
consumer.put_next(queryFromSlice(query, *slice));
}
consumer.put_done();
return rpl::lifetime();
};
}
rpl::producer<MessagesSliceUpdate> MessagesList::sliceUpdated() const {
return _sliceUpdated.events();
}
MessagesResult MessagesList::queryFromSlice(
const MessagesQuery &query,
const Slice &slice) const {
auto result = MessagesResult {};
auto position = ranges::lower_bound(slice.messages, query.aroundId);
auto haveBefore = int(position - begin(slice.messages));
auto haveEqualOrAfter = int(end(slice.messages) - position);
auto before = qMin(haveBefore, query.limitBefore);
auto equalOrAfter = qMin(haveEqualOrAfter, query.limitAfter + 1);
auto ids = std::vector<MessagePosition>(position - before, position + equalOrAfter);
result.messageIds.merge(ids.begin(), ids.end());
if (slice.range.from == MinMessagePosition) {
result.skippedBefore = haveBefore - before;
}
if (slice.range.till == MaxMessagePosition) {
result.skippedAfter = haveEqualOrAfter - equalOrAfter;
}
if (_count) {
result.count = _count;
if (!result.skippedBefore && result.skippedAfter) {
result.skippedBefore = *result.count
- *result.skippedAfter
- int(result.messageIds.size());
} else if (!result.skippedAfter && result.skippedBefore) {
result.skippedAfter = *result.count
- *result.skippedBefore
- int(result.messageIds.size());
}
}
return result;
}
MessagesSliceBuilder::MessagesSliceBuilder(
Key key,
int limitBefore,
int limitAfter)
: _key(key)
, _limitBefore(limitBefore)
, _limitAfter(limitAfter) {
}
bool MessagesSliceBuilder::applyInitial(const MessagesResult &result) {
mergeSliceData(
result.count,
result.messageIds,
result.skippedBefore,
result.skippedAfter);
return true;
}
bool MessagesSliceBuilder::applyUpdate(const MessagesSliceUpdate &update) {
auto intersects = [](MessagesRange range1, MessagesRange range2) {
return (range1.from <= range2.till)
&& (range2.from <= range1.till);
};
auto needMergeMessages = (update.messages != nullptr)
&& intersects(update.range, {
_ids.empty() ? _key : _ids.front(),
_ids.empty() ? _key : _ids.back()
});
if (!needMergeMessages && !update.count) {
return false;
}
auto skippedBefore = (update.range.from == MinMessagePosition)
? 0
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: std::optional<int> {};
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auto skippedAfter = (update.range.till == MaxMessagePosition)
? 0
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: std::optional<int> {};
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mergeSliceData(
update.count,
needMergeMessages
? *update.messages
: base::flat_set<MessagePosition> {},
skippedBefore,
skippedAfter);
return true;
}
bool MessagesSliceBuilder::removeOne(MessagePosition messageId) {
auto changed = false;
if (_fullCount && *_fullCount > 0) {
--*_fullCount;
changed = true;
}
if (_ids.contains(messageId)) {
_ids.remove(messageId);
changed = true;
} else if (!_ids.empty()) {
if (_ids.front() > messageId
&& _skippedBefore
&& *_skippedBefore > 0) {
--*_skippedBefore;
changed = true;
} else if (_ids.back() < messageId
&& _skippedAfter
&& *_skippedAfter > 0) {
--*_skippedAfter;
changed = true;
}
}
return changed;
}
bool MessagesSliceBuilder::removeAll() {
_ids = {};
_range = FullMessagesRange;
_fullCount = 0;
_skippedBefore = 0;
_skippedAfter = 0;
return true;
}
bool MessagesSliceBuilder::removeFromChannel(ChannelId channelId) {
for (auto i = _ids.begin(); i != _ids.end();) {
if ((*i).fullId.channel == channelId) {
i = _ids.erase(i);
if (_fullCount) {
--*_fullCount;
}
} else {
++i;
}
}
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_skippedBefore = _skippedAfter = std::nullopt;
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checkInsufficient();
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return true;
}
bool MessagesSliceBuilder::invalidated() {
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_fullCount = _skippedBefore = _skippedAfter = std::nullopt;
_ids.clear();
checkInsufficient();
return false;
}
bool MessagesSliceBuilder::bottomInvalidated() {
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_fullCount = _skippedAfter = std::nullopt;
checkInsufficient();
return true;
}
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void MessagesSliceBuilder::checkInsufficient() {
sliceToLimits();
}
void MessagesSliceBuilder::mergeSliceData(
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std::optional<int> count,
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const base::flat_set<MessagePosition> &messageIds,
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std::optional<int> skippedBefore,
std::optional<int> skippedAfter) {
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if (messageIds.empty()) {
if (count && _fullCount != count) {
_fullCount = count;
if (*_fullCount <= _ids.size()) {
_fullCount = _ids.size();
_skippedBefore = _skippedAfter = 0;
}
}
fillSkippedAndSliceToLimits();
return;
}
if (count) {
_fullCount = count;
}
const auto impossible = MessagePosition(-1, FullMsgId());
auto wasMinId = _ids.empty() ? impossible : _ids.front();
auto wasMaxId = _ids.empty() ? impossible : _ids.back();
_ids.merge(messageIds.begin(), messageIds.end());
auto adjustSkippedBefore = [&](MessagePosition oldId, int oldSkippedBefore) {
auto it = _ids.find(oldId);
Assert(it != _ids.end());
_skippedBefore = oldSkippedBefore - (it - _ids.begin());
accumulate_max(*_skippedBefore, 0);
};
if (skippedBefore) {
adjustSkippedBefore(messageIds.front(), *skippedBefore);
} else if (wasMinId != impossible && _skippedBefore) {
adjustSkippedBefore(wasMinId, *_skippedBefore);
} else {
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_skippedBefore = std::nullopt;
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}
auto adjustSkippedAfter = [&](MessagePosition oldId, int oldSkippedAfter) {
auto it = _ids.find(oldId);
Assert(it != _ids.end());
_skippedAfter = oldSkippedAfter - (_ids.end() - it - 1);
accumulate_max(*_skippedAfter, 0);
};
if (skippedAfter) {
adjustSkippedAfter(messageIds.back(), *skippedAfter);
} else if (wasMaxId != impossible && _skippedAfter) {
adjustSkippedAfter(wasMaxId, *_skippedAfter);
} else {
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_skippedAfter = std::nullopt;
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}
fillSkippedAndSliceToLimits();
}
void MessagesSliceBuilder::fillSkippedAndSliceToLimits() {
if (_fullCount) {
if (_skippedBefore && !_skippedAfter) {
_skippedAfter = *_fullCount
- *_skippedBefore
- int(_ids.size());
} else if (_skippedAfter && !_skippedBefore) {
_skippedBefore = *_fullCount
- *_skippedAfter
- int(_ids.size());
}
}
sliceToLimits();
}
void MessagesSliceBuilder::sliceToLimits() {
if (!_key) {
if (!_fullCount) {
requestMessagesCount();
}
return;
}
auto requestedSomething = false;
auto aroundIt = ranges::lower_bound(_ids, _key);
auto removeFromBegin = (aroundIt - _ids.begin() - _limitBefore);
auto removeFromEnd = (_ids.end() - aroundIt - _limitAfter - 1);
if (removeFromBegin > 0) {
_ids.erase(_ids.begin(), _ids.begin() + removeFromBegin);
if (_skippedBefore) {
*_skippedBefore += removeFromBegin;
}
} else if (removeFromBegin < 0
&& (!_skippedBefore || *_skippedBefore > 0)) {
requestedSomething = true;
requestMessages(RequestDirection::Before);
}
if (removeFromEnd > 0) {
_ids.erase(_ids.end() - removeFromEnd, _ids.end());
if (_skippedAfter) {
*_skippedAfter += removeFromEnd;
}
} else if (removeFromEnd < 0
&& (!_skippedAfter || *_skippedAfter > 0)) {
requestedSomething = true;
requestMessages(RequestDirection::After);
}
if (!_fullCount && !requestedSomething) {
requestMessagesCount();
}
}
void MessagesSliceBuilder::requestMessages(RequestDirection direction) {
auto requestAroundData = [&]() -> AroundData {
if (_ids.empty()) {
return { _key, Data::LoadDirection::Around };
} else if (direction == RequestDirection::Before) {
return { _ids.front(), Data::LoadDirection::Before };
}
return { _ids.back(), Data::LoadDirection::After };
};
_insufficientAround.fire(requestAroundData());
}
void MessagesSliceBuilder::requestMessagesCount() {
_insufficientAround.fire({
MessagePosition(),
Data::LoadDirection::Around });
}
MessagesSlice MessagesSliceBuilder::snapshot() const {
auto result = MessagesSlice();
result.ids.reserve(_ids.size());
for (const auto &position : _ids) {
result.ids.push_back(position.fullId);
}
result.skippedBefore = _skippedBefore;
result.skippedAfter = _skippedAfter;
result.fullCount = _fullCount;
return result;
}
} // namespace Data