tdlight/td/telegram/net/ConnectionCreator.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// 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/ConnectionCreator.h"
#include "td/telegram/ConfigManager.h"
#include "td/telegram/Global.h"
#include "td/telegram/logevent/LogEvent.h"
#include "td/telegram/StateManager.h"
#include "td/mtproto/IStreamTransport.h"
#include "td/mtproto/PingConnection.h"
#include "td/mtproto/RawConnection.h"
#include "td/net/GetHostByNameActor.h"
#include "td/net/Socks5.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/port/IPAddress.h"
#include "td/utils/ScopeGuard.h"
#include "td/utils/Time.h"
#include "td/utils/tl_helpers.h"
#include <algorithm>
namespace td {
namespace detail {
class StatsCallback final : public mtproto::RawConnection::StatsCallback {
public:
StatsCallback(std::shared_ptr<NetStatsCallback> net_stats_callback, ActorId<ConnectionCreator> connection_creator,
size_t hash, DcOptionsSet::Stat *option_stat)
: net_stats_callback_(std::move(net_stats_callback))
, connection_creator_(std::move(connection_creator))
, hash_(hash)
, option_stat_(option_stat) {
}
void on_read(uint64 bytes) final {
net_stats_callback_->on_read(bytes);
}
void on_write(uint64 bytes) final {
net_stats_callback_->on_write(bytes);
}
void on_pong() final {
send_lambda(connection_creator_, [stat = option_stat_] { stat->on_ok(); });
}
void on_error() final {
send_lambda(connection_creator_, [stat = option_stat_] { stat->on_error(); });
}
void on_mtproto_error() final {
send_closure(connection_creator_, &ConnectionCreator::on_mtproto_error, hash_);
}
private:
std::shared_ptr<NetStatsCallback> net_stats_callback_;
ActorId<ConnectionCreator> connection_creator_;
size_t hash_;
DcOptionsSet::Stat *option_stat_;
};
class PingActor : public Actor {
public:
PingActor(std::unique_ptr<mtproto::RawConnection> raw_connection,
Promise<std::unique_ptr<mtproto::RawConnection>> promise, ActorShared<> parent)
: promise_(std::move(promise)), parent_(std::move(parent)) {
ping_connection_ = std::make_unique<mtproto::PingConnection>(std::move(raw_connection));
}
private:
std::unique_ptr<mtproto::PingConnection> ping_connection_;
Promise<std::unique_ptr<mtproto::RawConnection>> promise_;
ActorShared<> parent_;
double start_at_;
void start_up() override {
ping_connection_->get_pollable().set_observer(this);
subscribe(ping_connection_->get_pollable());
start_at_ = Time::now();
set_timeout_in(10);
yield();
}
void tear_down() override {
finish(Status::OK());
}
void loop() override {
auto status = ping_connection_->flush();
if (status.is_error()) {
finish(std::move(status));
return stop();
}
if (ping_connection_->was_pong()) {
finish(Status::OK());
return stop();
}
}
void timeout_expired() override {
finish(Status::Error("Pong timeout expired"));
stop();
}
void finish(Status status) {
auto raw_connection = ping_connection_->move_as_raw_connection();
if (!raw_connection) {
CHECK(!promise_);
return;
}
unsubscribe(raw_connection->get_pollable());
raw_connection->get_pollable().set_observer(nullptr);
if (promise_) {
if (status.is_error()) {
if (raw_connection->stats_callback()) {
raw_connection->stats_callback()->on_error();
}
raw_connection->close();
promise_.set_error(std::move(status));
} else {
raw_connection->rtt_ = Time::now() - start_at_;
if (raw_connection->stats_callback()) {
raw_connection->stats_callback()->on_pong();
}
promise_.set_value(std::move(raw_connection));
}
} else {
if (raw_connection->stats_callback()) {
raw_connection->stats_callback()->on_error();
}
raw_connection->close();
}
}
};
} // namespace detail
template <class T>
void parse(Proxy &proxy, T &parser) {
using td::parse;
parse(proxy.type_, parser);
if (proxy.type() == Proxy::Type::Socks5) {
parse(proxy.server_, parser);
parse(proxy.port_, parser);
parse(proxy.user_, parser);
parse(proxy.password_, parser);
} else {
CHECK(proxy.type() == Proxy::Type::None);
}
}
template <class T>
void store(const Proxy &proxy, T &storer) {
using td::store;
store(proxy.type_, storer);
if (proxy.type() == Proxy::Type::Socks5) {
store(proxy.server_, storer);
store(proxy.port_, storer);
store(proxy.user_, storer);
store(proxy.password_, storer);
} else {
CHECK(proxy.type() == Proxy::Type::None);
}
}
ConnectionCreator::ClientInfo::ClientInfo() {
flood_control.add_limit(1, 1);
flood_control.add_limit(4, 2);
flood_control.add_limit(8, 3);
flood_control_online.add_limit(1, 4);
flood_control_online.add_limit(5, 5);
mtproto_error_flood_control.add_limit(1, 1);
mtproto_error_flood_control.add_limit(4, 2);
mtproto_error_flood_control.add_limit(8, 3);
}
ConnectionCreator::ConnectionCreator(ActorShared<> parent) : parent_(std::move(parent)) {
}
ConnectionCreator::ConnectionCreator(ConnectionCreator &&other) = default;
ConnectionCreator &ConnectionCreator::operator=(ConnectionCreator &&other) = default;
ConnectionCreator::~ConnectionCreator() = default;
void ConnectionCreator::set_net_stats_callback(std::shared_ptr<NetStatsCallback> common_callback,
std::shared_ptr<NetStatsCallback> media_callback) {
common_net_stats_callback_ = std::move(common_callback);
media_net_stats_callback_ = std::move(media_callback);
}
void ConnectionCreator::set_proxy(Proxy proxy) {
set_proxy_impl(std::move(proxy), false);
loop();
}
void ConnectionCreator::set_proxy_impl(Proxy proxy, bool from_db) {
proxy_ = std::move(proxy);
send_closure(G()->state_manager(), &StateManager::on_proxy, proxy_.type() != Proxy::Type::None);
if (!from_db) {
G()->td_db()->get_binlog_pmc()->set("proxy", log_event_store(proxy_).as_slice().str());
for (auto &child : children_) {
child.second.reset();
}
}
resolve_proxy_query_token_ = 0;
resolve_proxy_timestamp_ = Timestamp();
proxy_ip_address_ = IPAddress();
}
void ConnectionCreator::get_proxy(Promise<Proxy> promise) {
promise.set_value(Proxy(proxy_));
}
void ConnectionCreator::on_network(bool network_flag, uint32 network_generation) {
network_flag_ = network_flag;
auto old_generation = network_generation_;
network_generation_ = network_generation;
if (network_flag_) {
resolve_proxy_query_token_ = 0;
resolve_proxy_timestamp_ = Timestamp();
for (auto &client : clients_) {
client.second.backoff.clear();
client.second.flood_control.clear_events();
client.second.flood_control_online.clear_events();
client_loop(client.second);
}
if (old_generation != network_generation_) {
loop();
}
}
}
void ConnectionCreator::on_online(bool online_flag) {
online_flag_ = online_flag;
if (online_flag_) {
for (auto &client : clients_) {
client.second.backoff.clear();
client.second.flood_control_online.clear_events();
client_loop(client.second);
}
}
}
void ConnectionCreator::on_mtproto_error(size_t hash) {
auto &client = clients_[hash];
client.hash = hash;
client.mtproto_error_flood_control.add_event(static_cast<int32>(Time::now_cached()));
}
void ConnectionCreator::request_raw_connection(DcId dc_id, bool allow_media_only, bool is_media,
Promise<std::unique_ptr<mtproto::RawConnection>> promise, size_t hash) {
auto &client = clients_[hash];
if (!client.inited) {
client.inited = true;
client.hash = hash;
client.dc_id = dc_id;
client.allow_media_only = allow_media_only;
client.is_media = is_media;
} else {
CHECK(client.hash == hash);
CHECK(client.dc_id == dc_id);
CHECK(client.allow_media_only == allow_media_only);
CHECK(client.is_media == is_media);
}
VLOG(connections) << tag("client", format::as_hex(client.hash)) << " " << dc_id << " "
<< tag("allow_media_only", allow_media_only);
client.queries.push_back(std::move(promise));
client_loop(client);
}
void ConnectionCreator::request_raw_connection_by_ip(IPAddress ip_address,
Promise<std::unique_ptr<mtproto::RawConnection>> promise) {
auto r_socket_fd = SocketFd::open(ip_address);
if (r_socket_fd.is_error()) {
return promise.set_error(r_socket_fd.move_as_error());
}
auto raw_connection = std::make_unique<mtproto::RawConnection>(r_socket_fd.move_as_ok(),
mtproto::TransportType::ObfuscatedTcp, nullptr);
raw_connection->extra_ = network_generation_;
promise.set_value(std::move(raw_connection));
}
void ConnectionCreator::client_loop(ClientInfo &client) {
CHECK(client.hash != 0);
if (!network_flag_) {
return;
}
if (close_flag_) {
return;
}
bool use_socks5 = proxy_.type() == Proxy::Type::Socks5;
if (use_socks5 && !proxy_ip_address_.is_valid()) {
return;
}
VLOG(connections) << "client_loop: " << tag("client", format::as_hex(client.hash));
// Remove expired ready connections
client.ready_connections.erase(
std::remove_if(client.ready_connections.begin(), client.ready_connections.end(),
[&, expire_at = Time::now_cached() - ClientInfo::READY_CONNECTIONS_TIMEOUT](auto &v) {
bool drop = v.second < expire_at;
VLOG_IF(connections, drop) << "Drop expired " << tag("connection", v.first.get());
return drop;
}),
client.ready_connections.end());
// Send ready connections into promises
{
auto begin = client.queries.begin();
auto it = begin;
while (it != client.queries.end() && !client.ready_connections.empty()) {
VLOG(connections) << "Send to promise " << tag("connection", client.ready_connections.back().first.get());
it->set_value(std::move(client.ready_connections.back().first));
client.ready_connections.pop_back();
it++;
}
client.queries.erase(begin, it);
}
// Main loop. Create new connections till needed
bool check_mode = client.checking_connections != 0;
while (true) {
// Check if we need new connections
if (client.queries.empty()) {
if (!client.ready_connections.empty()) {
client_set_timeout_at(client, Time::now() + ClientInfo::READY_CONNECTIONS_TIMEOUT);
}
return;
}
if (check_mode) {
if (client.checking_connections >= 3) {
return;
}
} else {
if (client.pending_connections >= client.queries.size()) {
return;
}
}
// Check flood
auto &flood_control = online_flag_ ? client.flood_control_online : client.flood_control;
auto wakeup_at = max(flood_control.get_wakeup_at(), client.mtproto_error_flood_control.get_wakeup_at());
if (!online_flag_) {
wakeup_at = max(wakeup_at, client.backoff.get_wakeup_at());
}
if (wakeup_at > Time::now()) {
return client_set_timeout_at(client, wakeup_at);
}
flood_control.add_event(static_cast<int32>(Time::now()));
if (!online_flag_) {
client.backoff.add_event(static_cast<int32>(Time::now()));
}
// Create new RawConnection
DcOptionsSet::Stat *stat{nullptr};
bool use_http{false};
string debug_str;
IPAddress mtproto_ip;
// sync part
auto r_socket_fd = [&, dc_id = client.dc_id, allow_media_only = client.allow_media_only]() -> Result<SocketFd> {
TRY_RESULT(info, dc_options_set_.find_connection(dc_id, allow_media_only, use_socks5));
stat = info.stat;
use_http = info.use_http;
check_mode |= info.should_check;
if (use_socks5) {
mtproto_ip = info.option->get_ip_address();
IPAddress socks5_ip;
TRY_STATUS(socks5_ip.init_host_port(proxy_.server(), proxy_.port()));
debug_str = PSTRING() << "Sock5 " << socks5_ip << " --> " << info.option->get_ip_address() << " " << dc_id
<< (info.use_http ? " HTTP" : "");
LOG(INFO) << "Create: " << debug_str;
return SocketFd::open(socks5_ip);
} else {
debug_str = PSTRING() << info.option->get_ip_address() << " " << dc_id << (info.use_http ? " HTTP" : "");
LOG(INFO) << "Create: " << debug_str;
return SocketFd::open(info.option->get_ip_address());
}
}();
if (r_socket_fd.is_error()) {
LOG(WARNING) << r_socket_fd.error();
if (stat) {
stat->on_error(); // TODO: different kind of error
}
return client_set_timeout_at(client, Time::now() + 0.1);
}
auto socket_fd = r_socket_fd.move_as_ok();
IPAddress debug_ip;
auto debug_ip_status = debug_ip.init_socket_address(socket_fd);
if (debug_ip_status.is_ok()) {
debug_str = PSTRING() << debug_str << debug_ip;
} else {
LOG(ERROR) << debug_ip_status;
}
client.pending_connections++;
if (check_mode) {
stat->on_check();
client.checking_connections++;
}
auto promise = PromiseCreator::lambda(
[actor_id = actor_id(this), check_mode, use_http, hash = client.hash, debug_str,
network_generation = network_generation_](Result<ConnectionData> r_connection_data) mutable {
send_closure(std::move(actor_id), &ConnectionCreator::client_create_raw_connection,
std::move(r_connection_data), check_mode, use_http, hash, debug_str, network_generation);
});
auto stats_callback = std::make_unique<detail::StatsCallback>(
client.is_media ? media_net_stats_callback_ : common_net_stats_callback_, actor_id(this), client.hash, stat);
if (use_socks5) {
class Callback : public Socks5::Callback {
public:
explicit Callback(Promise<ConnectionData> promise, std::unique_ptr<detail::StatsCallback> stats_callback)
: promise_(std::move(promise)), stats_callback_(std::move(stats_callback)) {
}
void set_result(Result<SocketFd> result) override {
if (result.is_error()) {
connection_token_ = StateManager::ConnectionToken();
if (was_connected_) {
stats_callback_->on_error();
}
promise_.set_error(result.move_as_error());
} else {
ConnectionData data;
data.socket_fd = result.move_as_ok();
data.connection_token = std::move(connection_token_);
data.stats_callback = std::move(stats_callback_);
promise_.set_value(std::move(data));
}
}
void on_connected() override {
connection_token_ = StateManager::connection_proxy(G()->state_manager());
was_connected_ = true;
}
private:
Promise<ConnectionData> promise_;
StateManager::ConnectionToken connection_token_;
bool was_connected_{false};
std::unique_ptr<detail::StatsCallback> stats_callback_;
};
LOG(INFO) << "Start socks5: " << debug_str;
auto token = next_token();
children_[token] = create_actor<Socks5>(
"Socks5", std::move(socket_fd), mtproto_ip, proxy_.user().str(), proxy_.password().str(),
std::make_unique<Callback>(std::move(promise), std::move(stats_callback)), create_reference(token));
} else {
ConnectionData data;
data.socket_fd = std::move(socket_fd);
data.stats_callback = std::move(stats_callback);
promise.set_result(std::move(data));
}
}
}
void ConnectionCreator::client_create_raw_connection(Result<ConnectionData> r_connection_data, bool check_mode,
bool use_http, size_t hash, string debug_str,
uint32 network_generation) {
auto promise = PromiseCreator::lambda([actor_id = actor_id(this), hash, check_mode,
debug_str](Result<std::unique_ptr<mtproto::RawConnection>> result) mutable {
VLOG(connections) << "Ready " << debug_str << " " << tag("checked", check_mode) << tag("ok", result.is_ok());
send_closure(std::move(actor_id), &ConnectionCreator::client_add_connection, hash, std::move(result), check_mode);
});
if (r_connection_data.is_error()) {
return promise.set_error(r_connection_data.move_as_error());
}
auto connection_data = r_connection_data.move_as_ok();
auto raw_connection = std::make_unique<mtproto::RawConnection>(
std::move(connection_data.socket_fd),
use_http ? mtproto::TransportType::Http : mtproto::TransportType::ObfuscatedTcp,
std::move(connection_data.stats_callback));
raw_connection->set_connection_token(std::move(connection_data.connection_token));
raw_connection->extra_ = network_generation;
raw_connection->debug_str_ = debug_str;
if (check_mode) {
VLOG(connections) << "Start check: " << debug_str;
auto token = next_token();
children_[token] = create_actor<detail::PingActor>("PingActor", std::move(raw_connection), std::move(promise),
create_reference(token));
} else {
promise.set_value(std::move(raw_connection));
}
}
void ConnectionCreator::client_set_timeout_at(ClientInfo &client, double wakeup_at) {
if (!client.slot.has_event()) {
client.slot.set_event(self_closure(this, &ConnectionCreator::client_wakeup, client.hash));
}
client.slot.set_timeout_at(wakeup_at);
VLOG(connections) << tag("client", format::as_hex(client.hash)) << " set timeout in "
<< wakeup_at - Time::now_cached();
}
void ConnectionCreator::client_add_connection(size_t hash,
Result<std::unique_ptr<mtproto::RawConnection>> r_raw_connection,
bool check_flag) {
auto &client = clients_[hash];
CHECK(client.pending_connections > 0);
client.pending_connections--;
if (check_flag) {
CHECK(client.checking_connections > 0);
client.checking_connections--;
}
if (r_raw_connection.is_ok()) {
client.backoff.clear();
client.ready_connections.push_back(std::make_pair(r_raw_connection.move_as_ok(), Time::now_cached()));
}
client_loop(client);
}
void ConnectionCreator::client_wakeup(size_t hash) {
LOG(INFO) << tag("hash", format::as_hex(hash)) << " wakeup";
client_loop(clients_[hash]);
}
void ConnectionCreator::on_dc_options(DcOptions new_dc_options) {
LOG(INFO) << "SAVE " << new_dc_options;
G()->td_db()->get_binlog_pmc()->set("dc_options", serialize(new_dc_options));
dc_options_set_.reset();
dc_options_set_.add_dc_options(get_default_dc_options(G()->is_test_dc()));
#if !TD_EMSCRIPTEN // FIXME
dc_options_set_.add_dc_options(std::move(new_dc_options));
#endif
}
void ConnectionCreator::on_dc_update(DcId dc_id, string ip_port, Promise<> promise) {
promise.set_result([&]() -> Result<> {
if (!dc_id.is_exact()) {
return Status::Error("Invalid dc_id");
}
IPAddress ip_address;
TRY_STATUS(ip_address.init_host_port(ip_port));
DcOptions options;
options.dc_options.emplace_back(dc_id, ip_address);
send_closure(G()->config_manager(), &ConfigManager::on_dc_options_update, std::move(options));
return Unit();
}());
}
void ConnectionCreator::start_up() {
class StateCallback : public StateManager::Callback {
public:
explicit StateCallback(ActorId<ConnectionCreator> session) : session_(std::move(session)) {
}
bool on_network(NetType network_type, uint32 generation) override {
send_closure(session_, &ConnectionCreator::on_network, network_type != NetType::None, generation);
return session_.is_alive();
}
bool on_online(bool online_flag) override {
send_closure(session_, &ConnectionCreator::on_online, online_flag);
return session_.is_alive();
}
private:
ActorId<ConnectionCreator> session_;
};
send_closure(G()->state_manager(), &StateManager::add_callback, make_unique<StateCallback>(actor_id(this)));
auto serialized_dc_options = G()->td_db()->get_binlog_pmc()->get("dc_options");
DcOptions dc_options;
auto status = unserialize(dc_options, serialized_dc_options);
if (status.is_error()) {
on_dc_options(DcOptions());
} else {
on_dc_options(std::move(dc_options));
}
auto log_event_proxy = G()->td_db()->get_binlog_pmc()->get("proxy");
if (!log_event_proxy.empty()) {
Proxy proxy;
log_event_parse(proxy, log_event_proxy).ensure();
set_proxy_impl(std::move(proxy), true);
}
get_host_by_name_actor_ =
create_actor_on_scheduler<GetHostByNameActor>("GetHostByNameActor", G()->get_slow_net_scheduler_id(), 29 * 60, 0);
ref_cnt_guard_ = create_reference(-1);
loop();
}
void ConnectionCreator::hangup_shared() {
ref_cnt_--;
children_.erase(get_link_token());
if (ref_cnt_ == 0) {
stop();
}
}
ActorShared<ConnectionCreator> ConnectionCreator::create_reference(int64 token) {
CHECK(token != 0);
ref_cnt_++;
return actor_shared(this, token);
}
void ConnectionCreator::hangup() {
close_flag_ = true;
ref_cnt_guard_.reset();
for (auto &child : children_) {
child.second.reset();
}
}
DcOptions ConnectionCreator::get_default_dc_options(bool is_test) {
DcOptions res;
auto add_ip_ports = [&res](int32 dc_id, const vector<string> &ips, const vector<int> &ports) {
IPAddress ip_address;
for (auto &ip : ips) {
for (auto port : ports) {
ip_address.init_ipv4_port(ip, port).ensure();
res.dc_options.emplace_back(DcId::internal(dc_id), ip_address);
}
}
};
vector<int> ports = {443, 80, 5222};
if (is_test) {
add_ip_ports(1, {"149.154.175.10"}, ports);
add_ip_ports(2, {"149.154.167.40"}, ports);
add_ip_ports(3, {"149.154.175.117"}, ports);
} else {
add_ip_ports(1, {"149.154.175.50"}, ports);
add_ip_ports(2, {"149.154.167.51"}, ports);
add_ip_ports(3, {"149.154.175.100"}, ports);
add_ip_ports(4, {"149.154.167.91"}, ports);
add_ip_ports(5, {"149.154.171.5"}, ports);
}
return res;
}
void ConnectionCreator::loop() {
if (!network_flag_) {
return;
}
if (proxy_.type() != Proxy::Type::Socks5) {
return;
}
if (resolve_proxy_query_token_ != 0) {
return;
}
if (resolve_proxy_timestamp_ && !resolve_proxy_timestamp_.is_in_past()) {
set_timeout_at(resolve_proxy_timestamp_.at());
return;
}
resolve_proxy_query_token_ = next_token();
send_closure(
get_host_by_name_actor_, &GetHostByNameActor::run, proxy_.server().str(), proxy_.port(),
PromiseCreator::lambda([actor_id = create_reference(resolve_proxy_query_token_)](Result<IPAddress> result) {
send_closure(std::move(actor_id), &ConnectionCreator::on_proxy_resolved, std::move(result), false);
}));
}
void ConnectionCreator::on_proxy_resolved(Result<IPAddress> r_ip_address, bool dummy) {
SCOPE_EXIT {
loop();
};
if (get_link_token() != resolve_proxy_query_token_) {
return;
}
resolve_proxy_query_token_ = 0;
if (r_ip_address.is_error()) {
resolve_proxy_timestamp_ = Timestamp::in(5 * 60);
return;
}
proxy_ip_address_ = r_ip_address.move_as_ok();
resolve_proxy_timestamp_ = Timestamp::in(29 * 60);
for (auto &client : clients_) {
client_loop(client.second);
}
}
} // namespace td