tdlight/td/telegram/Client.cpp

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//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2023
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/telegram/Client.h"
#include "td/telegram/Td.h"
#include "td/telegram/TdCallback.h"
#include "td/actor/actor.h"
#include "td/actor/ConcurrentScheduler.h"
#include "td/utils/algorithm.h"
#include "td/utils/common.h"
#include "td/utils/crypto.h"
#include "td/utils/ExitGuard.h"
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#include "td/utils/FlatHashMap.h"
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#include "td/utils/FlatHashSet.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/MpscPollableQueue.h"
#include "td/utils/port/RwMutex.h"
#include "td/utils/port/thread.h"
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#include "td/utils/Slice.h"
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#include "td/utils/SliceBuilder.h"
#include "td/utils/StringBuilder.h"
#include "td/utils/utf8.h"
#include <algorithm>
#include <atomic>
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#include <limits>
#include <memory>
#include <mutex>
#include <queue>
namespace td {
#if TD_THREAD_UNSUPPORTED || TD_EVENTFD_UNSUPPORTED
class TdReceiver {
public:
ClientManager::Response receive(double timeout) {
if (!responses_.empty()) {
auto result = std::move(responses_.front());
responses_.pop();
return result;
}
return {0, 0, nullptr};
}
unique_ptr<TdCallback> create_callback(ClientManager::ClientId client_id) {
class Callback final : public TdCallback {
public:
Callback(ClientManager::ClientId client_id, TdReceiver *impl) : client_id_(client_id), impl_(impl) {
}
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void on_result(uint64 id, td_api::object_ptr<td_api::Object> result) final {
impl_->responses_.push({client_id_, id, std::move(result)});
}
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void on_error(uint64 id, td_api::object_ptr<td_api::error> error) final {
impl_->responses_.push({client_id_, id, std::move(error)});
}
Callback(const Callback &) = delete;
Callback &operator=(const Callback &) = delete;
Callback(Callback &&) = delete;
Callback &operator=(Callback &&) = delete;
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~Callback() final {
impl_->responses_.push({client_id_, 0, nullptr});
}
private:
ClientManager::ClientId client_id_;
TdReceiver *impl_;
};
return td::make_unique<Callback>(client_id, this);
}
void add_response(ClientManager::ClientId client_id, uint64 id, td_api::object_ptr<td_api::Object> result) {
responses_.push({client_id, id, std::move(result)});
}
private:
std::queue<ClientManager::Response> responses_;
};
class ClientManager::Impl final {
public:
ClientId create_client_id() {
CHECK(client_id_ != std::numeric_limits<ClientId>::max());
auto client_id = ++client_id_;
pending_clients_.insert(client_id);
return client_id;
}
void send(ClientId client_id, RequestId request_id, td_api::object_ptr<td_api::Function> &&request) {
if (pending_clients_.erase(client_id) != 0) {
if (tds_.empty()) {
CHECK(concurrent_scheduler_ == nullptr);
CHECK(options_.net_query_stats == nullptr);
options_.net_query_stats = std::make_shared<NetQueryStats>();
concurrent_scheduler_ = make_unique<ConcurrentScheduler>(0, 0);
concurrent_scheduler_->start();
}
tds_[client_id] =
concurrent_scheduler_->create_actor_unsafe<Td>(0, "Td", receiver_.create_callback(client_id), options_);
}
requests_.push_back({client_id, request_id, std::move(request)});
}
Response receive(double timeout) {
if (!requests_.empty()) {
for (size_t i = 0; i < requests_.size(); i++) {
auto &request = requests_[i];
if (request.client_id <= 0 || request.client_id > client_id_) {
receiver_.add_response(request.client_id, request.id,
td_api::make_object<td_api::error>(400, "Invalid TDLib instance specified"));
continue;
}
auto it = tds_.find(request.client_id);
if (it == tds_.end() || it->second.empty()) {
receiver_.add_response(request.client_id, request.id,
td_api::make_object<td_api::error>(500, "Request aborted"));
continue;
}
CHECK(concurrent_scheduler_ != nullptr);
auto guard = concurrent_scheduler_->get_main_guard();
send_closure_later(it->second, &Td::request, request.id, std::move(request.request));
}
requests_.clear();
}
auto response = receiver_.receive(0);
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if (response.client_id == 0 && response.request_id == 0 && concurrent_scheduler_ != nullptr) {
concurrent_scheduler_->run_main(0);
response = receiver_.receive(0);
} else {
ConcurrentScheduler::emscripten_clear_main_timeout();
}
if (response.request_id == 0 && response.object != nullptr &&
response.object->get_id() == td_api::updateAuthorizationState::ID &&
static_cast<const td_api::updateAuthorizationState *>(response.object.get())->authorization_state_->get_id() ==
td_api::authorizationStateClosed::ID) {
CHECK(concurrent_scheduler_ != nullptr);
auto guard = concurrent_scheduler_->get_main_guard();
auto it = tds_.find(response.client_id);
CHECK(it != tds_.end());
it->second.reset();
response.client_id = 0;
response.object = nullptr;
}
if (response.object == nullptr && response.client_id != 0 && response.request_id == 0) {
auto it = tds_.find(response.client_id);
CHECK(it != tds_.end());
CHECK(it->second.empty());
tds_.erase(it);
response.object = td_api::make_object<td_api::updateAuthorizationState>(
td_api::make_object<td_api::authorizationStateClosed>());
if (tds_.empty()) {
CHECK(options_.net_query_stats.use_count() == 1);
CHECK(options_.net_query_stats->get_count() == 0);
options_.net_query_stats = nullptr;
concurrent_scheduler_->finish();
concurrent_scheduler_ = nullptr;
reset_to_empty(tds_);
}
}
return response;
}
Impl() = default;
Impl(const Impl &) = delete;
Impl &operator=(const Impl &) = delete;
Impl(Impl &&) = delete;
Impl &operator=(Impl &&) = delete;
~Impl() {
if (concurrent_scheduler_ == nullptr) {
return;
}
{
auto guard = concurrent_scheduler_->get_main_guard();
for (auto &td : tds_) {
td.second.reset();
}
}
while (!tds_.empty() && !ExitGuard::is_exited()) {
receive(0.1);
}
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if (concurrent_scheduler_ != nullptr) {
concurrent_scheduler_->finish();
}
}
private:
TdReceiver receiver_;
struct Request {
ClientId client_id;
RequestId id;
td_api::object_ptr<td_api::Function> request;
};
vector<Request> requests_;
unique_ptr<ConcurrentScheduler> concurrent_scheduler_;
ClientId client_id_{0};
Td::Options options_;
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FlatHashSet<int32> pending_clients_;
FlatHashMap<int32, ActorOwn<Td>> tds_;
};
class Client::Impl final {
public:
Impl() : client_id_(impl_.create_client_id()) {
}
void send(Request request) {
impl_.send(client_id_, request.id, std::move(request.function));
}
Response receive(double timeout) {
auto response = impl_.receive(timeout);
Response old_response;
old_response.id = response.request_id;
old_response.object = std::move(response.object);
return old_response;
}
private:
ClientManager::Impl impl_;
ClientManager::ClientId client_id_;
};
#else
class MultiTd final : public Actor {
public:
explicit MultiTd(Td::Options options) : options_(std::move(options)) {
}
void create(int32 td_id, unique_ptr<TdCallback> callback) {
auto &td = tds_[td_id];
CHECK(td.empty());
string name = "Td";
auto context = std::make_shared<ActorContext>();
auto old_context = set_context(context);
auto old_tag = set_tag(to_string(td_id));
td = create_actor<Td>("Td", std::move(callback), options_);
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set_context(std::move(old_context));
set_tag(std::move(old_tag));
}
void send(ClientManager::ClientId client_id, ClientManager::RequestId request_id,
td_api::object_ptr<td_api::Function> &&request) {
auto &td = tds_[client_id];
CHECK(!td.empty());
send_closure(td, &Td::request, request_id, std::move(request));
}
void close(int32 td_id) {
size_t erased_count = tds_.erase(td_id);
CHECK(erased_count > 0);
}
private:
Td::Options options_;
FlatHashMap<int32, ActorOwn<Td>> tds_;
};
class TdReceiver {
public:
TdReceiver() {
output_queue_ = std::make_shared<OutputQueue>();
output_queue_->init();
}
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ClientManager::Response receive(double timeout, bool from_manager) {
VLOG(td_requests) << "Begin to wait for updates with timeout " << timeout;
auto is_locked = receive_lock_.exchange(true);
if (is_locked) {
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if (from_manager) {
LOG(FATAL) << "Receive must not be called simultaneously from two different threads, but this has just "
"happened. Call it from a fixed thread, dedicated for updates and response processing.";
} else {
LOG(FATAL) << "Receive is called after Client destroy, or simultaneously from different threads";
}
}
auto response = receive_unlocked(clamp(timeout, 0.0, 1000000.0));
is_locked = receive_lock_.exchange(false);
CHECK(is_locked);
VLOG(td_requests) << "End to wait for updates, returning object " << response.request_id << ' '
<< response.object.get();
return response;
}
unique_ptr<TdCallback> create_callback(ClientManager::ClientId client_id) {
class Callback final : public TdCallback {
public:
explicit Callback(ClientManager::ClientId client_id, std::shared_ptr<OutputQueue> output_queue)
: client_id_(client_id), output_queue_(std::move(output_queue)) {
}
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void on_result(uint64 id, td_api::object_ptr<td_api::Object> result) final {
output_queue_->writer_put({client_id_, id, std::move(result)});
}
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void on_error(uint64 id, td_api::object_ptr<td_api::error> error) final {
output_queue_->writer_put({client_id_, id, std::move(error)});
}
Callback(const Callback &) = delete;
Callback &operator=(const Callback &) = delete;
Callback(Callback &&) = delete;
Callback &operator=(Callback &&) = delete;
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~Callback() final {
output_queue_->writer_put({client_id_, 0, nullptr});
}
private:
ClientManager::ClientId client_id_;
std::shared_ptr<OutputQueue> output_queue_;
};
return td::make_unique<Callback>(client_id, output_queue_);
}
void add_response(ClientManager::ClientId client_id, uint64 id, td_api::object_ptr<td_api::Object> result) {
output_queue_->writer_put({client_id, id, std::move(result)});
}
private:
using OutputQueue = MpscPollableQueue<ClientManager::Response>;
std::shared_ptr<OutputQueue> output_queue_;
int output_queue_ready_cnt_{0};
std::atomic<bool> receive_lock_{false};
ClientManager::Response receive_unlocked(double timeout) {
if (output_queue_ready_cnt_ == 0) {
output_queue_ready_cnt_ = output_queue_->reader_wait_nonblock();
}
if (output_queue_ready_cnt_ > 0) {
output_queue_ready_cnt_--;
return output_queue_->reader_get_unsafe();
}
if (timeout != 0) {
output_queue_->reader_get_event_fd().wait(static_cast<int>(timeout * 1000));
return receive_unlocked(0);
}
return {0, 0, nullptr};
}
};
class MultiImpl {
public:
static constexpr int32 ADDITIONAL_THREAD_COUNT = 3;
explicit MultiImpl(std::shared_ptr<NetQueryStats> net_query_stats) {
concurrent_scheduler_ = std::make_shared<ConcurrentScheduler>(ADDITIONAL_THREAD_COUNT, 0);
concurrent_scheduler_->start();
{
auto guard = concurrent_scheduler_->get_main_guard();
Td::Options options;
options.net_query_stats = std::move(net_query_stats);
multi_td_ = create_actor<MultiTd>("MultiTd", std::move(options));
}
scheduler_thread_ = thread([concurrent_scheduler = concurrent_scheduler_] {
while (concurrent_scheduler->run_main(10)) {
}
});
}
MultiImpl(const MultiImpl &) = delete;
MultiImpl &operator=(const MultiImpl &) = delete;
MultiImpl(MultiImpl &&) = delete;
MultiImpl &operator=(MultiImpl &&) = delete;
static int32 create_id() {
auto result = current_id_.fetch_add(1);
CHECK(result <= static_cast<uint32>(std::numeric_limits<int32>::max()));
return static_cast<int32>(result);
}
void create(int32 td_id, unique_ptr<TdCallback> callback) {
auto guard = concurrent_scheduler_->get_send_guard();
send_closure(multi_td_, &MultiTd::create, td_id, std::move(callback));
}
static bool is_valid_client_id(int32 client_id) {
return client_id > 0 && static_cast<uint32>(client_id) < current_id_.load();
}
void send(ClientManager::ClientId client_id, ClientManager::RequestId request_id,
td_api::object_ptr<td_api::Function> &&request) {
auto guard = concurrent_scheduler_->get_send_guard();
send_closure(multi_td_, &MultiTd::send, client_id, request_id, std::move(request));
}
void close(ClientManager::ClientId client_id) {
auto guard = concurrent_scheduler_->get_send_guard();
send_closure(multi_td_, &MultiTd::close, client_id);
}
~MultiImpl() {
{
auto guard = concurrent_scheduler_->get_send_guard();
multi_td_.reset();
Scheduler::instance()->finish();
}
if (!ExitGuard::is_exited()) {
scheduler_thread_.join();
} else {
scheduler_thread_.detach();
}
concurrent_scheduler_->finish();
}
private:
std::shared_ptr<ConcurrentScheduler> concurrent_scheduler_;
thread scheduler_thread_;
ActorOwn<MultiTd> multi_td_;
static std::atomic<uint32> current_id_;
};
constexpr int32 MultiImpl::ADDITIONAL_THREAD_COUNT;
std::atomic<uint32> MultiImpl::current_id_{1};
class MultiImplPool {
public:
std::shared_ptr<MultiImpl> get() {
std::unique_lock<std::mutex> lock(mutex_);
if (impls_.empty()) {
init_openssl_threads();
auto max_client_threads = clamp(thread::hardware_concurrency(), 8u, 20u) * 5 / 4;
#if TD_OPENBSD
max_client_threads = td::min(max_client_threads, 4u);
#endif
impls_.resize(max_client_threads);
CHECK(impls_.size() * (1 + MultiImpl::ADDITIONAL_THREAD_COUNT + 1 /* IOCP */) < 128);
net_query_stats_ = std::make_shared<NetQueryStats>();
}
auto &impl = *std::min_element(impls_.begin(), impls_.end(),
[](auto &a, auto &b) { return a.lock().use_count() < b.lock().use_count(); });
auto result = impl.lock();
if (!result) {
result = std::make_shared<MultiImpl>(net_query_stats_);
impl = result;
}
return result;
}
void try_clear() {
std::unique_lock<std::mutex> lock(mutex_);
if (impls_.empty()) {
return;
}
for (auto &impl : impls_) {
if (impl.lock().use_count() != 0) {
return;
}
}
reset_to_empty(impls_);
CHECK(net_query_stats_.use_count() == 1);
CHECK(net_query_stats_->get_count() == 0);
net_query_stats_ = nullptr;
}
private:
std::mutex mutex_;
std::vector<std::weak_ptr<MultiImpl>> impls_;
std::shared_ptr<NetQueryStats> net_query_stats_;
};
class ClientManager::Impl final {
public:
ClientId create_client_id() {
auto client_id = MultiImpl::create_id();
{
auto lock = impls_mutex_.lock_write().move_as_ok();
impls_[client_id]; // create empty MultiImplInfo
}
return client_id;
}
void send(ClientId client_id, RequestId request_id, td_api::object_ptr<td_api::Function> &&request) {
auto lock = impls_mutex_.lock_read().move_as_ok();
if (!MultiImpl::is_valid_client_id(client_id)) {
receiver_.add_response(client_id, request_id,
td_api::make_object<td_api::error>(400, "Invalid TDLib instance specified"));
return;
}
auto it = impls_.find(client_id);
if (it != impls_.end() && it->second.impl == nullptr) {
lock.reset();
auto write_lock = impls_mutex_.lock_write().move_as_ok();
it = impls_.find(client_id);
if (it != impls_.end() && it->second.impl == nullptr) {
it->second.impl = pool_.get();
it->second.impl->create(client_id, receiver_.create_callback(client_id));
}
write_lock.reset();
lock = impls_mutex_.lock_read().move_as_ok();
it = impls_.find(client_id);
}
if (it == impls_.end() || it->second.is_closed) {
receiver_.add_response(client_id, request_id, td_api::make_object<td_api::error>(500, "Request aborted"));
return;
}
it->second.impl->send(client_id, request_id, std::move(request));
}
Response receive(double timeout) {
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auto response = receiver_.receive(timeout, true);
if (response.request_id == 0 && response.object != nullptr &&
response.object->get_id() == td_api::updateAuthorizationState::ID &&
static_cast<const td_api::updateAuthorizationState *>(response.object.get())->authorization_state_->get_id() ==
td_api::authorizationStateClosed::ID) {
auto lock = impls_mutex_.lock_write().move_as_ok();
close_impl(response.client_id);
response.client_id = 0;
response.object = nullptr;
}
if (response.object == nullptr && response.client_id != 0 && response.request_id == 0) {
auto lock = impls_mutex_.lock_write().move_as_ok();
auto it = impls_.find(response.client_id);
CHECK(it != impls_.end());
CHECK(it->second.is_closed);
impls_.erase(it);
response.object = td_api::make_object<td_api::updateAuthorizationState>(
td_api::make_object<td_api::authorizationStateClosed>());
if (impls_.empty()) {
reset_to_empty(impls_);
pool_.try_clear();
}
}
return response;
}
void close_impl(ClientId client_id) {
auto it = impls_.find(client_id);
CHECK(it != impls_.end());
if (!it->second.is_closed) {
it->second.is_closed = true;
if (it->second.impl == nullptr) {
receiver_.add_response(client_id, 0, nullptr);
} else {
it->second.impl->close(client_id);
}
}
}
Impl() = default;
Impl(const Impl &) = delete;
Impl &operator=(const Impl &) = delete;
Impl(Impl &&) = delete;
Impl &operator=(Impl &&) = delete;
~Impl() {
if (ExitGuard::is_exited()) {
return;
}
for (auto &it : impls_) {
close_impl(it.first);
}
while (!impls_.empty() && !ExitGuard::is_exited()) {
receive(0.1);
}
}
private:
MultiImplPool pool_;
RwMutex impls_mutex_;
struct MultiImplInfo {
std::shared_ptr<MultiImpl> impl;
bool is_closed = false;
};
FlatHashMap<ClientId, MultiImplInfo> impls_;
TdReceiver receiver_;
};
class Client::Impl final {
public:
Impl() {
static MultiImplPool pool;
multi_impl_ = pool.get();
td_id_ = MultiImpl::create_id();
multi_impl_->create(td_id_, receiver_.create_callback(td_id_));
}
void send(Request request) {
if (request.id == 0 || request.function == nullptr) {
LOG(ERROR) << "Drop wrong request " << request.id;
return;
}
multi_impl_->send(td_id_, request.id, std::move(request.function));
}
Response receive(double timeout) {
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auto response = receiver_.receive(timeout, false);
Response old_response;
old_response.id = response.request_id;
old_response.object = std::move(response.object);
return old_response;
}
Impl(const Impl &) = delete;
Impl &operator=(const Impl &) = delete;
Impl(Impl &&) = delete;
Impl &operator=(Impl &&) = delete;
~Impl() {
multi_impl_->close(td_id_);
while (!ExitGuard::is_exited()) {
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auto response = receiver_.receive(0.1, false);
if (response.object == nullptr && response.client_id != 0 && response.request_id == 0) {
break;
}
}
}
private:
std::shared_ptr<MultiImpl> multi_impl_;
TdReceiver receiver_;
int32 td_id_;
};
#endif
Client::Client() : impl_(std::make_unique<Impl>()) {
}
void Client::send(Request &&request) {
impl_->send(std::move(request));
}
Client::Response Client::receive(double timeout) {
return impl_->receive(timeout);
}
Client::Response Client::execute(Request &&request) {
Response response;
response.id = request.id;
response.object = Td::static_request(std::move(request.function));
return response;
}
Client::Client(Client &&other) noexcept = default;
Client &Client::operator=(Client &&other) noexcept = default;
Client::~Client() = default;
ClientManager::ClientManager() : impl_(std::make_unique<Impl>()) {
}
ClientManager::ClientId ClientManager::create_client_id() {
return impl_->create_client_id();
}
void ClientManager::send(ClientId client_id, RequestId request_id, td_api::object_ptr<td_api::Function> &&request) {
impl_->send(client_id, request_id, std::move(request));
}
ClientManager::Response ClientManager::receive(double timeout) {
return impl_->receive(timeout);
}
td_api::object_ptr<td_api::Object> ClientManager::execute(td_api::object_ptr<td_api::Function> &&request) {
return Td::static_request(std::move(request));
}
static std::atomic<ClientManager::LogMessageCallbackPtr> log_message_callback;
static void log_message_callback_wrapper(int verbosity_level, CSlice message) {
auto callback = log_message_callback.load(std::memory_order_relaxed);
if (callback != nullptr) {
if (check_utf8(message)) {
callback(verbosity_level, message.c_str());
} else {
size_t pos = 0;
while (1 <= message[pos] && message[pos] <= 126) {
pos++;
}
CHECK(pos + 1 < message.size());
auto utf8_message = PSTRING() << message.substr(0, pos)
<< url_encode(message.substr(pos, message.size() - pos - 1)) << '\n';
callback(verbosity_level, utf8_message.c_str());
}
}
}
void ClientManager::set_log_message_callback(int max_verbosity_level, LogMessageCallbackPtr callback) {
if (callback == nullptr) {
::td::set_log_message_callback(max_verbosity_level, nullptr);
log_message_callback = nullptr;
} else {
log_message_callback = callback;
::td::set_log_message_callback(max_verbosity_level, log_message_callback_wrapper);
}
}
ClientManager::ClientManager(ClientManager &&other) noexcept = default;
ClientManager &ClientManager::operator=(ClientManager &&other) noexcept = default;
ClientManager::~ClientManager() = default;
ClientManager *ClientManager::get_manager_singleton() {
static ClientManager client_manager;
static ExitGuard exit_guard;
return &client_manager;
}
} // namespace td