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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_streaming.h"
#include "data/data_photo.h"
#include "data/data_document.h"
#include "data/data_session.h"
#include "data/data_file_origin.h"
#include "media/streaming/media_streaming_loader.h"
#include "media/streaming/media_streaming_reader.h"
#include "media/streaming/media_streaming_document.h"
namespace Data {
namespace {
constexpr auto kKeepAliveTimeout = 5 * crl::time(1000);
template <typename Object, typename Data>
bool PruneDestroyedAndSet(
base::flat_map<
not_null<Data*>,
std::weak_ptr<Object>> &objects,
not_null<Data*> data,
const std::shared_ptr<Object> &object) {
auto result = false;
for (auto i = begin(objects); i != end(objects);) {
if (i->first == data) {
(i++)->second = object;
result = true;
} else if (i->second.lock() != nullptr) {
++i;
} else {
i = objects.erase(i);
}
}
return result;
}
} // namespace
Streaming::Streaming(not_null<Session*> owner)
: _owner(owner)
, _keptAliveTimer([=] { clearKeptAlive(); }) {
}
Streaming::~Streaming() = default;
template <typename Data>
[[nodiscard]] std::shared_ptr<Streaming::Reader> Streaming::sharedReader(
base::flat_map<not_null<Data*>, std::weak_ptr<Reader>> &readers,
not_null<Data*> data,
FileOrigin origin,
bool forceRemoteLoader) {
const auto i = readers.find(data);
if (i != end(readers)) {
if (auto result = i->second.lock()) {
if (!forceRemoteLoader || result->isRemoteLoader()) {
return result;
}
}
}
auto loader = data->createStreamingLoader(origin, forceRemoteLoader);
if (!loader) {
return nullptr;
}
auto result = std::make_shared<Reader>(
std::move(loader),
&_owner->cacheBigFile());
if (!PruneDestroyedAndSet(readers, data, result)) {
readers.emplace_or_assign(data, result);
}
return result;
}
template <typename Data>
[[nodiscard]] std::shared_ptr<Streaming::Document> Streaming::sharedDocument(
base::flat_map<not_null<Data*>, std::weak_ptr<Document>> &documents,
base::flat_map<not_null<Data*>, std::weak_ptr<Reader>> &readers,
not_null<Data*> data,
FileOrigin origin) {
const auto i = documents.find(data);
if (i != end(documents)) {
if (auto result = i->second.lock()) {
return result;
}
}
auto reader = sharedReader(readers, data, origin);
if (!reader) {
return nullptr;
}
auto result = std::make_shared<Document>(data, std::move(reader));
if (!PruneDestroyedAndSet(documents, data, result)) {
documents.emplace_or_assign(data, result);
}
return result;
}
template <typename Data>
void Streaming::keepAlive(
base::flat_map<not_null<Data*>, std::weak_ptr<Document>> &documents,
not_null<Data*> data) {
const auto i = documents.find(data);
if (i == end(documents)) {
return;
}
auto shared = i->second.lock();
if (!shared) {
return;
}
const auto till = crl::now() + kKeepAliveTimeout;
const auto j = _keptAlive.find(shared);
if (j != end(_keptAlive)) {
j->second = till;
} else {
_keptAlive.emplace(std::move(shared), till);
}
if (!_keptAliveTimer.isActive()) {
_keptAliveTimer.callOnce(kKeepAliveTimeout);
}
}
std::shared_ptr<Streaming::Reader> Streaming::sharedReader(
not_null<DocumentData*> document,
FileOrigin origin,
bool forceRemoteLoader) {
return sharedReader(_fileReaders, document, origin, forceRemoteLoader);
}
std::shared_ptr<Streaming::Document> Streaming::sharedDocument(
not_null<DocumentData*> document,
FileOrigin origin) {
return sharedDocument(_fileDocuments, _fileReaders, document, origin);
}
std::shared_ptr<Streaming::Reader> Streaming::sharedReader(
not_null<PhotoData*> photo,
FileOrigin origin,
bool forceRemoteLoader) {
return sharedReader(_photoReaders, photo, origin, forceRemoteLoader);
}
std::shared_ptr<Streaming::Document> Streaming::sharedDocument(
not_null<PhotoData*> photo,
FileOrigin origin) {
return sharedDocument(_photoDocuments, _photoReaders, photo, origin);
}
void Streaming::keepAlive(not_null<DocumentData*> document) {
keepAlive(_fileDocuments, document);
}
void Streaming::keepAlive(not_null<PhotoData*> photo) {
keepAlive(_photoDocuments, photo);
}
void Streaming::clearKeptAlive() {
const auto now = crl::now();
auto min = std::numeric_limits<crl::time>::max();
for (auto i = begin(_keptAlive); i != end(_keptAlive);) {
const auto wait = (i->second - now);
if (wait <= 0) {
i = _keptAlive.erase(i);
} else {
++i;
if (min > wait) {
min = wait;
}
}
}
if (!_keptAlive.empty()) {
_keptAliveTimer.callOnce(min);
}
}
} // namespace Data
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