tdlight/td/telegram/net/SessionProxy.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/net/SessionProxy.h"
#include "td/telegram/Global.h"
#include "td/telegram/net/AuthKeyState.h"
#include "td/telegram/net/ConnectionCreator.h"
#include "td/telegram/net/DcId.h"
#include "td/telegram/net/NetQueryDispatcher.h"
#include "td/telegram/net/Session.h"
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#include "td/telegram/Td.h"
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#include "td/telegram/TdDb.h"
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#include "td/telegram/telegram_api.h"
#include "td/telegram/UniqueId.h"
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#include "td/utils/buffer.h"
#include "td/utils/common.h"
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#include "td/utils/format.h"
#include "td/utils/HashTableUtils.h"
#include "td/utils/logging.h"
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#include "td/utils/Promise.h"
#include "td/utils/Slice.h"
#include "td/utils/SliceBuilder.h"
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#include "td/utils/Time.h"
#include "td/utils/tl_helpers.h"
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#include "td/utils/tl_parsers.h"
namespace td {
namespace mtproto {
class RawConnection;
} // namespace mtproto
class SessionCallback final : public Session::Callback {
public:
SessionCallback(ActorShared<SessionProxy> parent, DcId dc_id, bool allow_media_only, bool is_media, uint32 hash)
: parent_(std::move(parent))
, dc_id_(dc_id)
, allow_media_only_(allow_media_only)
, is_media_(is_media)
, hash_(hash) {
}
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void on_failed() final {
send_closure(parent_, &SessionProxy::on_failed);
}
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void on_closed() final {
send_closure(parent_, &SessionProxy::on_closed);
}
void request_raw_connection(unique_ptr<mtproto::AuthData> auth_data,
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Promise<unique_ptr<mtproto::RawConnection>> promise) final {
send_closure(G()->connection_creator(), &ConnectionCreator::request_raw_connection, dc_id_, allow_media_only_,
is_media_, std::move(promise), hash_, std::move(auth_data));
}
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void on_tmp_auth_key_updated(mtproto::AuthKey auth_key) final {
send_closure(parent_, &SessionProxy::on_tmp_auth_key_updated, std::move(auth_key));
}
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void on_server_salt_updated(std::vector<mtproto::ServerSalt> server_salts) final {
send_closure(parent_, &SessionProxy::on_server_salt_updated, std::move(server_salts));
}
void on_update(BufferSlice &&update, uint64 auth_key_id) final {
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TlBufferParser parser(&update);
auto updates = telegram_api::Updates::fetch(parser);
parser.fetch_end();
if (parser.get_error()) {
LOG(ERROR) << "Failed to fetch update: " << parser.get_error() << format::as_hex_dump<4>(update.as_slice());
updates = nullptr;
}
send_closure_later(G()->td(), &Td::on_update, std::move(updates), auth_key_id);
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}
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void on_result(NetQueryPtr query) final {
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if (UniqueId::extract_type(query->id()) != UniqueId::BindKey) {
send_closure(parent_, &SessionProxy::on_query_finished);
}
G()->net_query_dispatcher().dispatch(std::move(query));
}
private:
ActorShared<SessionProxy> parent_;
DcId dc_id_;
bool allow_media_only_ = false;
bool is_media_ = false;
uint32 hash_ = 0;
};
SessionProxy::SessionProxy(unique_ptr<Callback> callback, std::shared_ptr<AuthDataShared> shared_auth_data,
bool is_primary, bool is_main, bool allow_media_only, bool is_media, bool use_pfs,
bool persist_tmp_auth_key, bool is_cdn, bool need_destroy)
: callback_(std::move(callback))
, auth_data_(std::move(shared_auth_data))
, is_primary_(is_primary)
, is_main_(is_main)
, allow_media_only_(allow_media_only)
, is_media_(is_media)
, use_pfs_(use_pfs)
, persist_tmp_auth_key_(use_pfs && persist_tmp_auth_key)
, is_cdn_(is_cdn)
, need_destroy_(need_destroy) {
}
void SessionProxy::start_up() {
class Listener final : public AuthDataShared::Listener {
public:
explicit Listener(ActorShared<SessionProxy> session_proxy) : session_proxy_(std::move(session_proxy)) {
}
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bool notify() final {
if (!session_proxy_.is_alive()) {
return false;
}
send_closure(session_proxy_, &SessionProxy::update_auth_key_state);
return true;
}
private:
ActorShared<SessionProxy> session_proxy_;
};
auth_key_state_ = get_auth_key_state(auth_data_->get_auth_key());
auth_data_->add_auth_key_listener(make_unique<Listener>(actor_shared(this)));
string saved_auth_key = G()->td_db()->get_binlog_pmc()->get(tmp_auth_key_key());
if (!saved_auth_key.empty()) {
if (persist_tmp_auth_key_) {
unserialize(tmp_auth_key_, saved_auth_key).ensure();
if (tmp_auth_key_.expires_at() < Time::now()) {
tmp_auth_key_ = {};
} else {
LOG(WARNING) << "Loaded tmp_auth_key " << tmp_auth_key_.id() << ": " << get_auth_key_state(tmp_auth_key_);
}
} else {
LOG(WARNING) << "Drop saved tmp_auth_key";
G()->td_db()->get_binlog_pmc()->erase(tmp_auth_key_key());
}
}
open_session();
}
void SessionProxy::tear_down() {
for (auto &query : pending_queries_) {
query->resend();
callback_->on_query_finished();
G()->net_query_dispatcher().dispatch(std::move(query));
}
pending_queries_.clear();
}
void SessionProxy::send(NetQueryPtr query) {
if (query->auth_flag() == NetQuery::AuthFlag::On && auth_key_state_ != AuthKeyState::OK) {
query->debug(PSTRING() << get_name() << ": wait for auth");
pending_queries_.emplace_back(std::move(query));
return;
}
open_session(true);
query->debug(PSTRING() << get_name() << ": sent to session");
send_closure(session_, &Session::send, std::move(query));
}
void SessionProxy::update_main_flag(bool is_main) {
if (is_main_ == is_main) {
return;
}
LOG(INFO) << "Update " << get_name() << " is_main to " << is_main;
is_main_ = is_main;
close_session();
open_session();
}
void SessionProxy::update_destroy(bool need_destroy) {
if (need_destroy_ == need_destroy) {
LOG(INFO) << "Ignore reduntant update_destroy(" << need_destroy << ")";
return;
}
need_destroy_ = need_destroy;
close_session();
open_session();
}
void SessionProxy::on_failed() {
if (session_generation_ != get_link_token()) {
return;
}
close_session();
open_session();
}
void SessionProxy::update_mtproto_header() {
close_session();
open_session();
}
void SessionProxy::on_closed() {
}
void SessionProxy::close_session() {
send_closure(std::move(session_), &Session::close);
session_generation_++;
}
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void SessionProxy::open_session(bool force) {
if (!session_.empty()) {
return;
}
// There are several assumption that make this code OK
// 1. All unauthorized query will be sent into the same SessionProxy
// 2. All authorized query are delayed before we have authorization
// So only one SessionProxy will be active before we have authorization key
auto should_open = [&] {
if (force) {
return true;
}
if (need_destroy_) {
return auth_key_state_ != AuthKeyState::Empty;
}
if (is_main_) {
return true;
}
if (auth_key_state_ != AuthKeyState::OK) {
return false;
}
return !pending_queries_.empty();
}();
if (!should_open) {
return;
}
CHECK(session_.empty());
auto dc_id = auth_data_->dc_id();
string name = PSTRING() << "Session" << get_name().substr(Slice("SessionProxy").size());
string hash_string = PSTRING() << name << " " << dc_id.get_raw_id() << " " << allow_media_only_;
auto hash = Hash<string>()(hash_string);
int32 raw_dc_id = dc_id.get_raw_id();
int32 int_dc_id = raw_dc_id;
if (G()->is_test_dc()) {
int_dc_id += 10000;
}
if (allow_media_only_ && !is_cdn_) {
int_dc_id = -int_dc_id;
}
session_ = create_actor<Session>(
name,
make_unique<SessionCallback>(actor_shared(this, session_generation_), dc_id, allow_media_only_, is_media_, hash),
auth_data_, raw_dc_id, int_dc_id, is_primary_, is_main_, use_pfs_, persist_tmp_auth_key_, is_cdn_, need_destroy_,
tmp_auth_key_, server_salts_);
}
void SessionProxy::update_auth_key_state() {
auto old_auth_key_state = auth_key_state_;
auth_key_state_ = get_auth_key_state(auth_data_->get_auth_key());
if (auth_key_state_ != old_auth_key_state && old_auth_key_state == AuthKeyState::OK) {
close_session();
}
open_session();
if (session_.empty() || auth_key_state_ != AuthKeyState::OK) {
return;
}
for (auto &query : pending_queries_) {
query->debug(PSTRING() << get_name() << ": sent to session");
send_closure(session_, &Session::send, std::move(query));
}
pending_queries_.clear();
}
void SessionProxy::on_tmp_auth_key_updated(mtproto::AuthKey auth_key) {
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LOG(WARNING) << "Have tmp_auth_key " << auth_key.id() << ": " << get_auth_key_state(auth_key);
tmp_auth_key_ = std::move(auth_key);
if (persist_tmp_auth_key_) {
G()->td_db()->get_binlog_pmc()->set(tmp_auth_key_key(), serialize(tmp_auth_key_));
}
}
string SessionProxy::tmp_auth_key_key() const {
return PSTRING() << "tmp_auth" << get_name();
}
void SessionProxy::on_server_salt_updated(std::vector<mtproto::ServerSalt> server_salts) {
server_salts_ = std::move(server_salts);
}
void SessionProxy::on_query_finished() {
callback_->on_query_finished();
}
} // namespace td