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tdlib-fork/td/telegram/net/Session.cpp
levlam b9fc33b7d1 Add TransportType.h. 
GitOrigin-RevId: 403b10f5dcc161be411710749c70734cf9a4fc62
2019-01-31 05:13:59 +03:00

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
//
// 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/net/Session.h"
#include "td/telegram/telegram_api.h"
#include "td/telegram/DhCache.h"
#include "td/telegram/Global.h"
#include "td/telegram/net/MtprotoHeader.h"
#include "td/telegram/net/NetQuery.h"
#include "td/telegram/net/NetQueryDispatcher.h"
#include "td/telegram/net/NetType.h"
#include "td/telegram/StateManager.h"
#include "td/telegram/UniqueId.h"
#include "td/mtproto/crypto.h"
#include "td/mtproto/Handshake.h"
#include "td/mtproto/HandshakeActor.h"
#include "td/mtproto/RawConnection.h"
#include "td/mtproto/SessionConnection.h"
#include "td/mtproto/TransportType.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/Random.h"
#include "td/utils/Slice.h"
#include "td/utils/Time.h"
#include "td/utils/Timer.h"
#include "td/utils/tl_parsers.h"
#include <algorithm>
#include <tuple>
#include <utility>
namespace td {
namespace detail {
class GenAuthKeyActor : public Actor {
public:
GenAuthKeyActor(Slice name, unique_ptr<mtproto::AuthKeyHandshake> handshake,
unique_ptr<mtproto::AuthKeyHandshakeContext> context,
Promise<unique_ptr<mtproto::RawConnection>> connection_promise,
Promise<unique_ptr<mtproto::AuthKeyHandshake>> handshake_promise,
std::shared_ptr<Session::Callback> callback)
: name_(name.str())
, handshake_(std::move(handshake))
, context_(std::move(context))
, connection_promise_(std::move(connection_promise))
, handshake_promise_(std::move(handshake_promise))
, callback_(std::move(callback)) {
}
void on_network(uint32 network_generation) {
if (network_generation_ != network_generation) {
send_closure(std::move(child_), &mtproto::HandshakeActor::close);
}
}
private:
string name_;
uint32 network_generation_ = 0;
unique_ptr<mtproto::AuthKeyHandshake> handshake_;
unique_ptr<mtproto::AuthKeyHandshakeContext> context_;
Promise<unique_ptr<mtproto::RawConnection>> connection_promise_;
Promise<unique_ptr<mtproto::AuthKeyHandshake>> handshake_promise_;
std::shared_ptr<Session::Callback> callback_;
CancellationToken cancellation_token_{true};
ActorOwn<mtproto::HandshakeActor> child_;
void start_up() override {
// Bug in Android clang and MSVC
// std::tuple<Result<int>> b(std::forward_as_tuple(Result<int>()));
callback_->request_raw_connection(PromiseCreator::cancellable_lambda(
cancellation_token_, [actor_id = actor_id(this)](Result<unique_ptr<mtproto::RawConnection>> r_raw_connection) {
send_closure(actor_id, &GenAuthKeyActor::on_connection, std::move(r_raw_connection), false);
}));
}
void hangup() override {
if (connection_promise_) {
connection_promise_.set_error(Status::Error(1, "Cancelled"));
}
if (handshake_promise_) {
handshake_promise_.set_error(Status::Error(1, "Cancelled"));
}
stop();
}
void on_connection(Result<unique_ptr<mtproto::RawConnection>> r_raw_connection, bool dummy) {
if (r_raw_connection.is_error()) {
connection_promise_.set_error(r_raw_connection.move_as_error());
handshake_promise_.set_value(std::move(handshake_));
return;
}
auto raw_connection = r_raw_connection.move_as_ok();
VLOG(dc) << "Receive raw connection " << raw_connection.get();
network_generation_ = raw_connection->extra_;
child_ = create_actor_on_scheduler<mtproto::HandshakeActor>(
PSLICE() << name_ + "::HandshakeActor", G()->get_slow_net_scheduler_id(), std::move(handshake_),
std::move(raw_connection), std::move(context_), 10, std::move(connection_promise_),
std::move(handshake_promise_));
}
};
} // namespace detail
Session::Session(unique_ptr<Callback> callback, std::shared_ptr<AuthDataShared> shared_auth_data, int32 dc_id,
bool is_main, bool use_pfs, bool is_cdn, bool need_destroy, const mtproto::AuthKey &tmp_auth_key,
std::vector<mtproto::ServerSalt> server_salts)
: dc_id_(dc_id), is_main_(is_main), is_cdn_(is_cdn) {
VLOG(dc) << "Start connection";
need_destroy_ = need_destroy;
if (need_destroy) {
use_pfs = false;
CHECK(!is_cdn);
}
shared_auth_data_ = std::move(shared_auth_data);
auth_data_.set_use_pfs(use_pfs);
auth_data_.set_main_auth_key(shared_auth_data_->get_auth_key());
auth_data_.set_server_time_difference(shared_auth_data_->get_server_time_difference());
auth_data_.set_future_salts(shared_auth_data_->get_future_salts(), Time::now());
if (use_pfs && !tmp_auth_key.empty()) {
auth_data_.set_tmp_auth_key(tmp_auth_key);
auth_data_.set_future_salts(std::move(server_salts), Time::now());
}
uint64 session_id = 0;
do {
Random::secure_bytes(reinterpret_cast<uint8 *>(&session_id), sizeof(session_id));
} while (session_id == 0);
auth_data_.set_session_id(session_id);
LOG(WARNING) << "Generate new session_id " << session_id << " for " << (use_pfs ? "temp " : "")
<< (is_cdn ? "CDN " : "") << "auth key " << auth_data_.get_auth_key().id() << " for DC" << dc_id;
callback_ = std::shared_ptr<Callback>(callback.release());
main_connection_.connection_id = 0;
long_poll_connection_.connection_id = 1;
if (is_cdn) {
auth_data_.set_header(G()->mtproto_header().get_anonymous_header().str());
} else {
auth_data_.set_header(G()->mtproto_header().get_default_header().str());
}
last_activity_timestamp_ = Time::now();
}
bool Session::can_destroy_auth_key() const {
return need_destroy_;
}
void Session::start_up() {
class StateCallback : public StateManager::Callback {
public:
explicit StateCallback(ActorId<Session> session) : session_(std::move(session)) {
}
bool on_network(NetType network_type, uint32 network_generation) override {
send_closure(session_, &Session::on_network, network_type != NetType::None, network_generation);
return session_.is_alive();
}
bool on_online(bool online_flag) override {
send_closure(session_, &Session::on_online, online_flag);
return session_.is_alive();
}
private:
ActorId<Session> session_;
};
send_closure(G()->state_manager(), &StateManager::add_callback, make_unique<StateCallback>(actor_id(this)));
yield();
}
void Session::on_network(bool network_flag, uint32 network_generation) {
was_on_network_ = true;
network_flag_ = network_flag;
if (network_generation_ != network_generation) {
network_generation_ = network_generation;
connection_close(&main_connection_);
connection_close(&long_poll_connection_);
}
for (auto &handshake_info : handshake_info_) {
if (handshake_info.actor_.empty()) {
continue;
}
send_closure(handshake_info.actor_, &detail::GenAuthKeyActor::on_network, network_generation);
}
loop();
}
void Session::on_online(bool online_flag) {
online_flag_ = online_flag;
connection_online_update(true);
loop();
}
void Session::connection_online_update(bool force) {
bool new_connection_online_flag =
online_flag_ && (has_queries() || last_activity_timestamp_ + 10 > Time::now_cached() || is_main_);
if (connection_online_flag_ == new_connection_online_flag && !force) {
return;
}
connection_online_flag_ = new_connection_online_flag;
VLOG(dc) << "Set connection_online " << connection_online_flag_;
if (main_connection_.connection) {
main_connection_.connection->set_online(connection_online_flag_, is_main_);
}
if (long_poll_connection_.connection) {
long_poll_connection_.connection->set_online(connection_online_flag_, is_main_);
}
}
void Session::send(NetQueryPtr &&query) {
last_activity_timestamp_ = Time::now();
query->debug("Session: received from SessionProxy");
query->set_session_id(auth_data_.get_session_id());
VLOG(net_query) << "got query " << query;
if (query->update_is_ready()) {
return_query(std::move(query));
return;
}
add_query(std::move(query));
loop();
}
void Session::on_result(NetQueryPtr query) {
CHECK(UniqueId::extract_type(query->id()) == UniqueId::BindKey);
if (last_bind_id_ != query->id()) {
query->clear();
return;
}
LOG(INFO) << "ANSWER TO BindKey" << query;
Status status;
tmp_auth_key_id_ = 0;
last_bind_id_ = 0;
if (query->is_error()) {
status = std::move(query->error());
} else {
auto r_flag = fetch_result<telegram_api::auth_bindTempAuthKey>(query->ok());
if (r_flag.is_error()) {
status = r_flag.move_as_error();
} else {
auto flag = r_flag.move_as_ok();
if (!flag) {
status = Status::Error("Returned false");
}
}
}
if (status.is_ok()) {
LOG(INFO) << "BOUND!" << tag("tmp_id", auth_data_.get_tmp_auth_key().id());
auth_data_.on_bind();
on_tmp_auth_key_updated();
} else {
LOG(ERROR) << "BindKey failed: " << status;
}
query->clear();
yield();
}
void Session::return_query(NetQueryPtr &&query) {
last_activity_timestamp_ = Time::now();
query->set_session_id(0);
G()->net_query_dispatcher().dispatch(std::move(query));
}
void Session::flush_pending_invoke_after_queries() {
while (!pending_invoke_after_queries_.empty()) {
auto &query = pending_invoke_after_queries_.front();
pending_queries_.push_back(std::move(query));
pending_invoke_after_queries_.pop_front();
}
}
void Session::close() {
LOG(INFO) << "Close session (external)";
close_flag_ = true;
connection_close(&main_connection_);
connection_close(&long_poll_connection_);
for (auto &it : sent_queries_) {
auto &query = it.second.query;
query->set_message_id(0);
query->cancel_slot_.clear_event();
pending_queries_.push_back(std::move(query));
}
sent_queries_.clear();
sent_containers_.clear();
flush_pending_invoke_after_queries();
CHECK(sent_queries_.empty());
while (!pending_queries_.empty()) {
auto &query = pending_queries_.front();
query->set_error_resend();
return_query(std::move(query));
pending_queries_.pop_front();
}
callback_->on_closed();
stop();
}
void Session::hangup() {
LOG(DEBUG) << "HANGUP";
close();
}
void Session::raw_event(const Event::Raw &event) {
auto message_id = event.u64;
auto it = sent_queries_.find(message_id);
if (it == sent_queries_.end()) {
return;
}
dec_container(it->first, &it->second);
mark_as_known(it->first, &it->second);
auto query = std::move(it->second.query);
query->set_message_id(0);
query->cancel_slot_.clear_event();
sent_queries_.erase(it);
return_query(std::move(query));
LOG(DEBUG) << "Drop answer " << tag("message_id", format::as_hex(message_id));
if (main_connection_.state == ConnectionInfo::State::Ready) {
main_connection_.connection->cancel_answer(message_id);
} else {
to_cancel_.push_back(message_id);
}
loop();
}
/** Connection::Callback **/
void Session::on_connected() {
if (is_main_) {
connection_token_ = StateManager::connection(G()->state_manager());
}
}
Status Session::on_pong() {
constexpr int MAX_QUERY_TIMEOUT = 60;
constexpr int MIN_CONNECTION_ACTIVE = 60;
if (current_info_ == &main_connection_ &&
Timestamp::at(current_info_->created_at + MIN_CONNECTION_ACTIVE).is_in_past()) {
Status status;
if (!unknown_queries_.empty()) {
status = Status::Error(PSLICE() << "No state info for " << unknown_queries_.size() << " queries for "
<< format::as_time(Time::now_cached() - current_info_->created_at));
}
if (!sent_queries_list_.empty()) {
for (auto it = sent_queries_list_.prev; it != &sent_queries_list_; it = it->prev) {
auto query = Query::from_list_node(it);
if (Timestamp::at(query->sent_at_ + MAX_QUERY_TIMEOUT).is_in_past()) {
if (status.is_ok()) {
status = Status::Error(PSLICE() << "No answer for " << query->query << " for "
<< format::as_time(Time::now_cached() - query->sent_at_));
}
query->ack = false;
} else {
break;
}
}
if (status.is_error()) {
return status;
}
}
}
return Status::OK();
}
void Session::on_auth_key_updated() {
shared_auth_data_->set_auth_key(auth_data_.get_main_auth_key());
}
void Session::on_tmp_auth_key_updated() {
callback_->on_tmp_auth_key_updated(auth_data_.get_tmp_auth_key());
}
void Session::on_server_salt_updated() {
if (auth_data_.use_pfs()) {
callback_->on_server_salt_updated(auth_data_.get_future_salts());
return;
}
shared_auth_data_->set_future_salts(auth_data_.get_future_salts());
}
void Session::on_server_time_difference_updated() {
shared_auth_data_->update_server_time_difference(auth_data_.get_server_time_difference());
}
void Session::on_before_close() {
Scheduler::unsubscribe_before_close(current_info_->connection->get_poll_info().get_pollable_fd_ref());
}
void Session::on_closed(Status status) {
if (!close_flag_ && is_main_) {
connection_token_.reset();
}
if (status.is_error()) {
LOG(WARNING) << "on_closed: " << status << " " << current_info_->connection->get_name();
} else {
LOG(INFO) << "on_closed: " << status << " " << current_info_->connection->get_name();
}
if (status.is_error() && status.code() == -404) {
if (auth_data_.use_pfs()) {
LOG(WARNING) << "Invalidate tmp_key";
auth_data_.drop_tmp_auth_key();
on_tmp_auth_key_updated();
yield();
} else if (is_cdn_) {
LOG(WARNING) << "Invalidate cdn tmp_key";
auth_data_.drop_main_auth_key();
on_auth_key_updated();
on_session_failed(std::move(status));
} else if (need_destroy_) {
auth_data_.drop_main_auth_key();
on_auth_key_updated();
}
}
// resend all queries without ack.
for (auto it = sent_queries_.begin(); it != sent_queries_.end();) {
if (!it->second.ack && it->second.connection_id == current_info_->connection_id) {
// container vector leak otherwise
cleanup_container(it->first, &it->second);
// mark query as unknown
if (status.is_error() && status.code() == 500) {
cleanup_container(it->first, &it->second);
mark_as_known(it->first, &it->second);
auto &query = it->second.query;
VLOG(net_query) << "resend query (on_disconnected, no ack) " << query;
query->set_message_id(0);
query->cancel_slot_.clear_event();
query->set_error(Status::Error(500, PSLICE() << "Session failed: " << status.message()),
current_info_->connection->get_name().str());
return_query(std::move(query));
it = sent_queries_.erase(it);
} else {
mark_as_unknown(it->first, &it->second);
++it;
}
} else {
++it;
}
}
current_info_->connection.reset();
current_info_->state = ConnectionInfo::State::Empty;
}
void Session::on_session_created(uint64 unique_id, uint64 first_id) {
// TODO: use unique_id
// send updatesTooLong to force getDifference
LOG(INFO) << "new_session_created " << unique_id << " " << first_id;
if (is_main_) {
LOG(DEBUG) << "Sending updatesTooLong to force getDifference";
telegram_api::updatesTooLong too_long_;
auto storer = create_storer(too_long_);
BufferSlice packet(storer.size());
auto real_size = storer.store(packet.as_slice().ubegin());
CHECK(real_size == packet.size());
return_query(G()->net_query_creator().create_result(0, std::move(packet)));
}
for (auto it = sent_queries_.begin(); it != sent_queries_.end();) {
Query *query_ptr = &it->second;
if (query_ptr->container_id < first_id) {
// container vector leak otherwise
cleanup_container(it->first, &it->second);
mark_as_known(it->first, &it->second);
auto &query = it->second.query;
VLOG(net_query) << "resend query (on_session_created) " << query;
query->set_message_id(0);
query->cancel_slot_.clear_event();
resend_query(std::move(query));
it = sent_queries_.erase(it);
} else {
++it;
}
}
}
void Session::on_session_failed(Status status) {
if (status.is_error()) {
LOG(WARNING) << "Session failed: " << status;
} else {
LOG(INFO) << "Session will be closed soon";
}
// this connection will be closed soon
close_flag_ = true;
callback_->on_failed();
}
void Session::on_container_sent(uint64 container_id, vector<uint64> msg_ids) {
auto erase_from = std::remove_if(msg_ids.begin(), msg_ids.end(), [&](uint64 msg_id) {
auto it = sent_queries_.find(msg_id);
if (it == sent_queries_.end()) {
return true; // remove
}
it->second.container_id = container_id;
return false;
});
msg_ids.erase(erase_from, msg_ids.end());
if (msg_ids.empty()) {
return;
}
auto size = msg_ids.size();
sent_containers_.emplace(container_id, ContainerInfo{size, std::move(msg_ids)});
}
void Session::on_message_ack(uint64 id) {
on_message_ack_impl(id, 1);
}
void Session::on_message_ack_impl(uint64 id, int32 type) {
auto cit = sent_containers_.find(id);
if (cit != sent_containers_.end()) {
auto container_info = std::move(cit->second);
for (auto message_id : container_info.message_ids) {
on_message_ack_impl_inner(message_id, type, true);
}
sent_containers_.erase(cit);
return;
}
on_message_ack_impl_inner(id, type, false);
}
void Session::on_message_ack_impl_inner(uint64 id, int32 type, bool in_container) {
auto it = sent_queries_.find(id);
if (it == sent_queries_.end()) {
return;
}
VLOG(net_query) << "Ack " << tag("msg_id", id) << it->second.query;
it->second.ack = true;
it->second.query->debug_ack |= type;
it->second.query->quick_ack_promise_.set_value(Unit());
if (!in_container) {
cleanup_container(id, &it->second);
}
mark_as_known(it->first, &it->second);
}
void Session::dec_container(uint64 message_id, Query *query) {
if (query->container_id == message_id) {
// message was sent without any container
return;
}
auto it = sent_containers_.find(query->container_id);
if (it == sent_containers_.end()) {
return;
}
CHECK(it->second.ref_cnt > 0);
it->second.ref_cnt--;
if (it->second.ref_cnt == 0) {
sent_containers_.erase(it);
}
}
void Session::cleanup_container(uint64 message_id, Query *query) {
if (query->container_id == message_id) {
// message was sent without any container
return;
}
// we can forget container now, since we have an answer for its part.
// TODO: we can do it only for one element per container
sent_containers_.erase(query->container_id);
}
void Session::mark_as_known(uint64 id, Query *query) {
query->query->debug_unknown = false;
if (!query->unknown) {
return;
}
VLOG(net_query) << "Mark as known " << tag("msg_id", id) << query->query;
query->unknown = false;
unknown_queries_.erase(id);
if (unknown_queries_.empty()) {
flush_pending_invoke_after_queries();
}
}
void Session::mark_as_unknown(uint64 id, Query *query) {
query->query->debug_unknown = true;
if (query->unknown) {
return;
}
VLOG(net_query) << "Mark as unknown " << tag("msg_id", id) << query->query;
query->unknown = true;
unknown_queries_.insert(id);
}
Status Session::on_message_result_ok(uint64 id, BufferSlice packet, size_t original_size) {
// Steal authorization information.
// It is a dirty hack, yep.
TlParser parser(packet.as_slice());
int32 ID = parser.fetch_int();
if (!parser.get_error()) {
if (ID == telegram_api::auth_authorization::ID) {
LOG(INFO) << "GOT AUTHORIZATION!";
auth_data_.set_auth_flag(true);
shared_auth_data_->set_auth_key(auth_data_.get_main_auth_key());
}
}
if (id == 0) {
if (is_cdn_) {
return Status::Error("Got update from CDN connection");
}
return_query(G()->net_query_creator().create_result(0, std::move(packet)));
return Status::OK();
}
auto it = sent_queries_.find(id);
if (it == sent_queries_.end()) {
LOG(DEBUG) << "DROP result to " << tag("request_id", format::as_hex(id)) << tag("tl", format::as_hex(ID));
if (packet.size() > 16 * 1024) {
dropped_size_ += packet.size();
if (dropped_size_ > (256 * 1024)) {
auto dropped_size = dropped_size_;
dropped_size_ = 0;
return Status::Error(
2, PSLICE() << "Too much dropped packets " << tag("total_size", format::as_size(dropped_size)));
}
}
return Status::OK();
}
auth_data_.on_api_response();
Query *query_ptr = &it->second;
VLOG(net_query) << "Return query result " << query_ptr->query;
cleanup_container(id, query_ptr);
mark_as_known(id, query_ptr);
query_ptr->query->on_net_read(original_size);
query_ptr->query->set_ok(std::move(packet));
query_ptr->query->set_message_id(0);
query_ptr->query->cancel_slot_.clear_event();
return_query(std::move(query_ptr->query));
sent_queries_.erase(it);
return Status::OK();
}
void Session::on_message_result_error(uint64 id, int error_code, BufferSlice message) {
// UNAUTHORIZED
// TODO: some errors shouldn't cause loss of authorizations. Especially when PFS will be used
if (error_code == 401 && message.as_slice() != CSlice("SESSION_PASSWORD_NEEDED")) {
if (auth_data_.use_pfs() && message.as_slice() == CSlice("AUTH_KEY_PERM_EMPTY")) {
LOG(ERROR) << "Receive AUTH_KEY_PERM_EMPTY in session " << auth_data_.get_session_id() << " for auth key "
<< auth_data_.get_tmp_auth_key().id();
auth_data_.drop_tmp_auth_key();
on_tmp_auth_key_updated();
error_code = 500;
} else {
LOG(WARNING) << "Lost authorization due to " << tag("msg", message.as_slice());
auth_data_.set_auth_flag(false);
shared_auth_data_->set_auth_key(auth_data_.get_main_auth_key());
on_session_failed(Status::OK());
}
}
if (id == 0) {
LOG(WARNING) << "Session got error update";
return;
}
LOG(DEBUG) << "Session::on_error " << tag("id", id) << tag("error_code", error_code)
<< tag("msg", message.as_slice());
auto it = sent_queries_.find(id);
if (it == sent_queries_.end()) {
return;
}
Query *query_ptr = &it->second;
VLOG(net_query) << "return query error " << query_ptr->query;
cleanup_container(id, query_ptr);
mark_as_known(id, query_ptr);
query_ptr->query->set_error(Status::Error(error_code, message.as_slice()),
current_info_->connection->get_name().str());
query_ptr->query->set_message_id(0);
query_ptr->query->cancel_slot_.clear_event();
return_query(std::move(query_ptr->query));
sent_queries_.erase(it);
}
void Session::on_message_failed_inner(uint64 id, bool in_container) {
LOG(INFO) << "message inner failed " << id;
auto it = sent_queries_.find(id);
if (it == sent_queries_.end()) {
return;
}
Query *query_ptr = &it->second;
if (!in_container) {
cleanup_container(id, query_ptr);
}
mark_as_known(id, query_ptr);
query_ptr->query->set_message_id(0);
query_ptr->query->cancel_slot_.clear_event();
query_ptr->query->debug_send_failed();
resend_query(std::move(query_ptr->query));
sent_queries_.erase(it);
}
void Session::on_message_failed(uint64 id, Status status) {
LOG(INFO) << "on_message_failed " << tag("id", id) << tag("status", status);
status.ignore();
auto cit = sent_containers_.find(id);
if (cit != sent_containers_.end()) {
auto container_info = std::move(cit->second);
for (auto message_id : container_info.message_ids) {
on_message_failed_inner(message_id, true);
}
sent_containers_.erase(cit);
return;
}
on_message_failed_inner(id, false);
}
void Session::on_message_info(uint64 id, int32 state, uint64 answer_id, int32 answer_size) {
auto it = sent_queries_.find(id);
if (it != sent_queries_.end()) {
if (it->second.query->update_is_ready()) {
dec_container(it->first, &it->second);
mark_as_known(it->first, &it->second);
auto query = std::move(it->second.query);
query->set_message_id(0);
query->cancel_slot_.clear_event();
sent_queries_.erase(it);
return_query(std::move(query));
return;
}
}
if (id != 0) {
if (it == sent_queries_.end()) {
return;
}
switch (state & 7) {
case 1:
case 2:
case 3:
// message not received by server
return on_message_failed(id, Status::Error("Unknown message id"));
case 0:
if (answer_id == 0) {
LOG(ERROR) << "Unexpected message_info.state == 0 " << tag("id", id) << tag("state", state)
<< tag("answer_id", answer_id);
return on_message_failed(id, Status::Error("Unexpected message_info.state == 0"));
}
// fallthrough
case 4:
on_message_ack_impl(id, 2);
break;
default:
LOG(ERROR) << "Invalid message info " << tag("state", state);
}
}
// ok, we are waiting for result of id. let's ask to resend it
if (answer_id != 0) {
if (it != sent_queries_.end()) {
VLOG_IF(net_query, id != 0) << "Resend answer " << tag("msg_id", id) << tag("answer_id", answer_id)
<< tag("answer_size", answer_size) << it->second.query;
it->second.query->debug("Session: resend answer");
}
current_info_->connection->resend_answer(answer_id);
}
}
Status Session::on_destroy_auth_key() {
auth_data_.drop_main_auth_key();
on_auth_key_updated();
return Status::Error("Close because of on_destroy_auth_key");
}
bool Session::has_queries() const {
return !pending_invoke_after_queries_.empty() || !pending_queries_.empty() || !sent_queries_.empty();
}
void Session::resend_query(NetQueryPtr query) {
if (UniqueId::extract_type(query->id()) == UniqueId::BindKey) {
query->set_error_resend();
return_query(std::move(query));
} else {
add_query(std::move(query));
}
}
void Session::add_query(NetQueryPtr &&net_query) {
net_query->debug("Session: pending");
LOG_IF(FATAL, UniqueId::extract_type(net_query->id()) == UniqueId::BindKey)
<< "Add BindKey query inpo pending_queries_";
pending_queries_.emplace_back(std::move(net_query));
}
void Session::connection_send_query(ConnectionInfo *info, NetQueryPtr &&net_query, uint64 message_id) {
net_query->debug("Session: trying to send to mtproto::connection");
CHECK(info->state == ConnectionInfo::State::Ready);
current_info_ = info;
if (net_query->update_is_ready()) {
return return_query(std::move(net_query));
}
uint64 invoke_after_id = 0;
NetQueryRef invoke_after = net_query->invoke_after();
if (!invoke_after.empty()) {
invoke_after_id = invoke_after->message_id();
if (invoke_after->session_id() != auth_data_.get_session_id() || invoke_after_id == 0) {
net_query->set_error_resend_invoke_after();
return return_query(std::move(net_query));
}
if (!unknown_queries_.empty()) {
pending_invoke_after_queries_.push_back(std::move(net_query));
return;
}
}
net_query->debug("Session: send to mtproto::connection");
auto r_message_id =
info->connection->send_query(net_query->query().clone(), net_query->gzip_flag() == NetQuery::GzipFlag::On,
message_id, invoke_after_id, static_cast<bool>(net_query->quick_ack_promise_));
net_query->on_net_write(net_query->query().size());
if (r_message_id.is_error()) {
LOG(FATAL) << "Failed to send query: " << r_message_id.error();
}
message_id = r_message_id.ok();
VLOG(net_query) << "send query to connection " << net_query << " [msg_id:" << format::as_hex(message_id) << "]"
<< tag("invoke_after", format::as_hex(invoke_after_id));
net_query->set_message_id(message_id);
net_query->cancel_slot_.clear_event();
CHECK(sent_queries_.find(message_id) == sent_queries_.end()) << message_id;
net_query->debug_unknown = false;
net_query->debug_ack = 0;
if (!net_query->cancel_slot_.empty()) {
LOG(DEBUG) << "set event for net_query cancellation " << tag("message_id", format::as_hex(message_id));
net_query->cancel_slot_.set_event(EventCreator::raw(actor_id(), message_id));
}
auto status = sent_queries_.emplace(
message_id, Query{message_id, std::move(net_query), main_connection_.connection_id, Time::now_cached()});
sent_queries_list_.put(status.first->second.get_list_node());
if (!status.second) {
LOG(FATAL) << "Duplicate message_id oO [message_id=" << message_id << "]";
}
}
void Session::connection_open(ConnectionInfo *info, bool ask_info) {
CHECK(info->state == ConnectionInfo::State::Empty);
if (!network_flag_) {
return;
}
if (!auth_data_.has_auth_key(Time::now_cached())) {
return;
}
info->ask_info = ask_info;
info->state = ConnectionInfo::State::Connecting;
info->cancellation_token_ = CancellationToken{true};
// NB: rely on constant location of info
auto promise = PromiseCreator::cancellable_lambda(
info->cancellation_token_,
[actor_id = actor_id(this), info = info](Result<unique_ptr<mtproto::RawConnection>> res) {
send_closure(actor_id, &Session::connection_open_finish, info, std::move(res));
});
if (cached_connection_) {
VLOG(dc) << "Reuse cached connection";
promise.set_value(std::move(cached_connection_));
} else {
VLOG(dc) << "Request new connection";
callback_->request_raw_connection(std::move(promise));
}
info->wakeup_at = Time::now_cached() + 1000;
}
void Session::connection_add(unique_ptr<mtproto::RawConnection> raw_connection) {
VLOG(dc) << "Cache connection " << raw_connection.get();
cached_connection_ = std::move(raw_connection);
cached_connection_timestamp_ = Time::now();
}
void Session::connection_check_mode(ConnectionInfo *info) {
if (close_flag_ || info->state != ConnectionInfo::State::Ready) {
return;
}
if (info->mode != mode_) {
LOG(WARNING) << "Close connection because of outdated mode_";
connection_close(info);
}
}
void Session::connection_open_finish(ConnectionInfo *info,
Result<unique_ptr<mtproto::RawConnection>> r_raw_connection) {
if (close_flag_ || info->state != ConnectionInfo::State::Connecting) {
VLOG(dc) << "Ignore raw connection while closing";
return;
}
current_info_ = info;
if (r_raw_connection.is_error()) {
LOG(WARNING) << "Failed to open socket: " << r_raw_connection.error();
info->state = ConnectionInfo::State::Empty;
yield();
return;
}
auto raw_connection = r_raw_connection.move_as_ok();
VLOG(dc) << "Receive raw connection " << raw_connection.get();
if (raw_connection->extra_ != network_generation_) {
LOG(WARNING) << "Got RawConnection with old network_generation";
info->state = ConnectionInfo::State::Empty;
yield();
return;
}
Mode expected_mode =
raw_connection->get_transport_type().type == mtproto::TransportType::Http ? Mode::Http : Mode::Tcp;
if (mode_ != expected_mode) {
VLOG(dc) << "Change mode " << mode_ << "--->" << expected_mode;
mode_ = expected_mode;
if (info->connection_id == 1 && mode_ != Mode::Http) {
LOG(WARNING) << "Got tcp connection for long poll connection";
connection_add(std::move(raw_connection));
info->state = ConnectionInfo::State::Empty;
yield();
return;
}
}
// mtproto::TransportType transport_type = raw_connection->get_transport_type();
mtproto::SessionConnection::Mode mode;
Slice mode_name;
if (mode_ == Mode::Tcp) {
mode = mtproto::SessionConnection::Mode::Tcp;
mode_name = "Tcp";
} else {
if (info->connection_id == 0) {
mode = mtproto::SessionConnection::Mode::Http;
mode_name = "Http";
} else {
mode = mtproto::SessionConnection::Mode::HttpLongPoll;
mode_name = "HttpLongPoll";
}
}
auto name = PSTRING() << get_name() << "::Connect::" << mode_name << "::" << raw_connection->debug_str_;
LOG(INFO) << "connection_open_finish: " << name;
//LOG(ERROR) << "connection_open_finish: " << name;
info->connection = make_unique<mtproto::SessionConnection>(mode, std::move(raw_connection), &auth_data_);
info->connection->set_online(connection_online_flag_, is_main_);
info->connection->set_name(name);
Scheduler::subscribe(info->connection->get_poll_info().extract_pollable_fd(this));
info->mode = mode_;
info->state = ConnectionInfo::State::Ready;
info->created_at = Time::now_cached();
info->wakeup_at = Time::now_cached() + 10;
if (unknown_queries_.size() > 1024) {
on_session_failed(Status::Error("Too much queries with unknown state"));
return;
}
if (info->ask_info) {
for (auto &id : unknown_queries_) {
info->connection->get_state_info(id);
}
for (auto &id : to_cancel_) {
info->connection->cancel_answer(id);
}
to_cancel_.clear();
}
yield();
}
void Session::connection_flush(ConnectionInfo *info) {
CHECK(info->state == ConnectionInfo::State::Ready);
current_info_ = info;
info->wakeup_at = info->connection->flush(static_cast<mtproto::SessionConnection::Callback *>(this));
}
void Session::connection_close(ConnectionInfo *info) {
current_info_ = info;
if (info->state != ConnectionInfo::State::Ready) {
return;
}
info->connection->force_close(static_cast<mtproto::SessionConnection::Callback *>(this));
CHECK(info->state == ConnectionInfo::State::Empty);
}
bool Session::need_send_bind_key() const {
return auth_data_.use_pfs() && !auth_data_.get_bind_flag() && auth_data_.get_tmp_auth_key().id() != tmp_auth_key_id_;
}
bool Session::need_send_query() const {
return !close_flag_ && (!auth_data_.use_pfs() || auth_data_.get_bind_flag()) && !pending_queries_.empty() &&
!can_destroy_auth_key();
}
bool Session::connection_send_bind_key(ConnectionInfo *info) {
CHECK(info->state != ConnectionInfo::State::Empty);
uint64 key_id = auth_data_.get_tmp_auth_key().id();
if (key_id == tmp_auth_key_id_) {
return false;
}
tmp_auth_key_id_ = key_id;
last_bind_id_ = UniqueId::next(UniqueId::BindKey);
int64 perm_auth_key_id = auth_data_.get_main_auth_key().id();
int64 nonce = Random::secure_int64();
int32 expire_at = static_cast<int32>(auth_data_.get_server_time(auth_data_.get_tmp_auth_key().expire_at()));
int64 message_id;
BufferSlice encrypted;
std::tie(message_id, encrypted) = info->connection->encrypted_bind(perm_auth_key_id, nonce, expire_at);
LOG(INFO) << "Bind key: " << tag("tmp", key_id) << tag("perm", static_cast<uint64>(perm_auth_key_id));
NetQueryPtr query = G()->net_query_creator().create(
last_bind_id_,
create_storer(telegram_api::auth_bindTempAuthKey(perm_auth_key_id, nonce, expire_at, std::move(encrypted))));
query->dispatch_ttl = 0;
query->set_callback(actor_shared(this));
connection_send_query(info, std::move(query), message_id);
return true;
}
void Session::on_handshake_ready(Result<unique_ptr<mtproto::AuthKeyHandshake>> r_handshake) {
auto handshake_id = narrow_cast<HandshakeId>(get_link_token() - 1);
bool is_main = handshake_id == MainAuthKeyHandshake;
auto &info = handshake_info_[handshake_id];
info.flag_ = false;
info.actor_.reset();
if (r_handshake.is_error()) {
LOG(ERROR) << "Handshake failed: " << r_handshake.move_as_error();
} else {
auto handshake = r_handshake.move_as_ok();
if (!handshake->is_ready_for_finish()) {
LOG(WARNING) << "Handshake is not yet ready";
info.handshake_ = std::move(handshake);
} else {
if (is_main) {
auth_data_.set_main_auth_key(std::move(handshake->auth_key));
on_auth_key_updated();
} else {
if (is_main_) {
registered_temp_auth_key_ = TempAuthKeyWatchdog::register_auth_key_id(handshake->auth_key.id());
}
auth_data_.set_tmp_auth_key(std::move(handshake->auth_key));
on_tmp_auth_key_updated();
}
LOG(WARNING) << "Update auth key in session_id " << auth_data_.get_session_id() << " to "
<< auth_data_.get_auth_key().id();
connection_close(&main_connection_);
connection_close(&long_poll_connection_);
// Salt of temporary key is different salt. Do not rewrite it
if (auth_data_.use_pfs() ^ is_main) {
auth_data_.set_server_salt(handshake->server_salt, Time::now_cached());
on_server_salt_updated();
}
if (auth_data_.update_server_time_difference(handshake->server_time_diff)) {
on_server_time_difference_updated();
}
LOG(INFO) << "Got " << (is_main ? "main" : "tmp") << " auth key";
}
}
loop();
}
void Session::create_gen_auth_key_actor(HandshakeId handshake_id) {
auto &info = handshake_info_[handshake_id];
if (info.flag_) {
return;
}
LOG(INFO) << "Create GenAuthKeyActor " << handshake_id;
info.flag_ = true;
bool is_main = handshake_id == MainAuthKeyHandshake;
if (!info.handshake_) {
info.handshake_ = make_unique<mtproto::AuthKeyHandshake>(dc_id_, is_main && !is_cdn_ ? 0 : 24 * 60 * 60);
}
class AuthKeyHandshakeContext : public mtproto::AuthKeyHandshakeContext {
public:
AuthKeyHandshakeContext(DhCallback *dh_callback, std::shared_ptr<PublicRsaKeyInterface> public_rsa_key)
: dh_callback_(dh_callback), public_rsa_key_(std::move(public_rsa_key)) {
}
DhCallback *get_dh_callback() override {
return dh_callback_;
}
PublicRsaKeyInterface *get_public_rsa_key_interface() override {
return public_rsa_key_.get();
}
private:
DhCallback *dh_callback_;
std::shared_ptr<PublicRsaKeyInterface> public_rsa_key_;
};
info.actor_ = create_actor<detail::GenAuthKeyActor>(
PSLICE() << get_name() << "::GenAuthKey", get_name(), std::move(info.handshake_),
td::make_unique<AuthKeyHandshakeContext>(DhCache::instance(), shared_auth_data_->public_rsa_key()),
PromiseCreator::lambda([self = actor_id(this)](Result<unique_ptr<mtproto::RawConnection>> r_connection) {
if (r_connection.is_error()) {
if (r_connection.error().code() != 1) {
LOG(WARNING) << "Failed to open connection: " << r_connection.error();
}
return;
}
send_closure(self, &Session::connection_add, r_connection.move_as_ok());
}),
PromiseCreator::lambda(
[self = actor_shared(this, handshake_id + 1), handshake_perf = PerfWarningTimer("handshake", 1000.1)](
Result<unique_ptr<mtproto::AuthKeyHandshake>> handshake) mutable {
// later is just to avoid lost hangup
send_closure_later(std::move(self), &Session::on_handshake_ready, std::move(handshake));
}),
callback_);
}
void Session::auth_loop() {
if (can_destroy_auth_key()) {
return;
}
if (auth_data_.need_main_auth_key()) {
create_gen_auth_key_actor(MainAuthKeyHandshake);
}
if (auth_data_.need_tmp_auth_key(Time::now_cached())) {
create_gen_auth_key_actor(TmpAuthKeyHandshake);
}
}
void Session::loop() {
if (!was_on_network_) {
return;
}
Time::now(); // update now
if (cached_connection_timestamp_ < Time::now_cached() - 10) {
cached_connection_.reset();
}
if (!is_main_ && !has_queries() && !need_destroy_ &&
last_activity_timestamp_ < Time::now_cached() - ACTIVITY_TIMEOUT) {
on_session_failed(Status::OK());
}
auth_loop();
connection_online_update();
double wakeup_at = 0;
main_connection_.wakeup_at = 0;
long_poll_connection_.wakeup_at = 0;
// NB: order is crucial. First long_poll_connection, then main_connection
// Otherwise queries could be sent with big delay
connection_check_mode(&main_connection_);
connection_check_mode(&long_poll_connection_);
if (mode_ == Mode::Http) {
if (long_poll_connection_.state == ConnectionInfo::State::Ready) {
connection_flush(&long_poll_connection_);
}
if (!close_flag_ && long_poll_connection_.state == ConnectionInfo::State::Empty) {
connection_open(&long_poll_connection_);
}
relax_timeout_at(&wakeup_at, long_poll_connection_.wakeup_at);
}
if (main_connection_.state == ConnectionInfo::State::Ready) {
// do not send queries before we have key and e.t.c
// do not send queries before tmp_key is bound
bool need_flush = true;
while (main_connection_.state == ConnectionInfo::State::Ready) {
if (auth_data_.is_ready(Time::now_cached())) {
if (need_send_query()) {
while (!pending_queries_.empty()) {
auto &query = pending_queries_.front();
connection_send_query(&main_connection_, std::move(query));
pending_queries_.pop_front();
}
need_flush = true;
}
if (need_send_bind_key()) {
// send auth.bindTempAuthKey
connection_send_bind_key(&main_connection_);
need_flush = true;
}
if (can_destroy_auth_key()) {
if (main_connection_.connection) {
main_connection_.connection->destroy_key();
}
}
}
if (need_flush) {
connection_flush(&main_connection_);
need_flush = false;
} else {
break;
}
}
}
if (!close_flag_ && main_connection_.state == ConnectionInfo::State::Empty) {
connection_open(&main_connection_, true /*send ask_info*/);
}
relax_timeout_at(&wakeup_at, main_connection_.wakeup_at);
double wakeup_in = 0;
if (wakeup_at != 0) {
wakeup_in = wakeup_at - Time::now_cached();
LOG(DEBUG) << "Wakeup after " << wakeup_in;
set_timeout_at(wakeup_at);
}
// TODO: write proper condition..
// LOG_IF(ERROR, !close_flag_ && ((wakeup_at == 0 && network_flag_) || wakeup_in < 0 || wakeup_in > 3000))
// << "Bad timeout in: " << wakeup_in;
}
} // namespace td
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