tdlight/td/mtproto/PingConnection.cpp

//
// 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/mtproto/PingConnection.h"
#include "td/mtproto/SessionConnection.h"
namespace td {
namespace mtproto {
namespace detail {
class PingConnectionReqPQ
    : public PingConnection
    , private RawConnection::Callback {
 public:
  PingConnectionReqPQ(unique_ptr<RawConnection> raw_connection, size_t ping_count)
      : raw_connection_(std::move(raw_connection)), ping_count_(ping_count) {
  }

  PollableFdInfo &get_poll_info() override {
    return raw_connection_->get_poll_info();
  }

  unique_ptr<RawConnection> move_as_raw_connection() override {
    return std::move(raw_connection_);
  }

  Status flush() override {
    if (!was_ping_) {
      UInt128 nonce;
      Random::secure_bytes(nonce.raw, sizeof(nonce));
      raw_connection_->send_no_crypto(PacketStorer<NoCryptoImpl>(1, create_storer(mtproto_api::req_pq_multi(nonce))));
      was_ping_ = true;
      if (ping_count_ == 1) {
        start_time_ = Time::now();
      }
    }
    return raw_connection_->flush(AuthKey(), *this);
  }
  bool was_pong() const override {
    return finish_time_ > 0;
  }
  double rtt() const override {
    return finish_time_ - start_time_;
  }

  Status on_raw_packet(const PacketInfo &packet_info, BufferSlice packet) override {
    if (packet.size() < 12) {
      return Status::Error("Result is too small");
    }
    packet.confirm_read(12);
    // TODO: fetch_result

    if (--ping_count_ > 0) {
      was_ping_ = false;
      return flush();
    } else {
      finish_time_ = Time::now();
      return Status::OK();
    }
  }

 private:
  unique_ptr<RawConnection> raw_connection_;
  size_t ping_count_ = 1;
  double start_time_ = 0.0;
  double finish_time_ = 0.0;
  bool was_ping_ = false;
};

class PingConnectionPingPong
    : public PingConnection
    , private SessionConnection::Callback {
 public:
  PingConnectionPingPong(unique_ptr<mtproto::RawConnection> raw_connection, unique_ptr<mtproto::AuthData> auth_data)
      : auth_data_(std::move(auth_data)) {
    connection_ =
        make_unique<SessionConnection>(SessionConnection::Mode::Tcp, std::move(raw_connection), auth_data_.get());
  }

 private:
  unique_ptr<mtproto::AuthData> auth_data_;
  unique_ptr<mtproto::SessionConnection> connection_;
  bool was_pong_{false};
  bool is_closed_{false};
  Status status_;
  void on_connected() override {
  }
  void on_before_close() override {
    Scheduler::unsubscribe_before_close(connection_->get_poll_info().get_pollable_fd_ref());
  }
  void on_closed(Status status) override {
    is_closed_ = true;
    status_ = std::move(status);
  }

  void on_auth_key_updated() override {
  }
  void on_tmp_auth_key_updated() override {
  }
  void on_server_salt_updated() override {
  }
  void on_server_time_difference_updated() override {
  }

  void on_session_created(uint64 unique_id, uint64 first_id) override {
  }
  void on_session_failed(Status status) override {
  }

  void on_container_sent(uint64 container_id, vector<uint64> msgs_id) override {
  }
  Status on_pong() override {
    was_pong_ = true;
    return Status::OK();
  }

  void on_message_ack(uint64 id) override {
  }
  Status on_message_result_ok(uint64 id, BufferSlice packet, size_t original_size) override {
    LOG(ERROR) << "Unexpected message";
    return Status::OK();
  }
  void on_message_result_error(uint64 id, int code, BufferSlice descr) override {
  }
  void on_message_failed(uint64 id, Status status) override {
  }
  void on_message_info(uint64 id, int32 state, uint64 answer_id, int32 answer_size) override {
  }

  Status on_destroy_auth_key() override {
    LOG(ERROR) << "Destroy auth key";
    return Status::OK();
  }
  PollableFdInfo &get_poll_info() override {
    return connection_->get_poll_info();
  }
  unique_ptr<RawConnection> move_as_raw_connection() override {
    return connection_->move_as_raw_connection();
  }
  Status flush() override {
    if (was_pong_) {
      return Status::OK();
    }
    connection_->flush(this);
    if (is_closed_) {
      return std::move(status_);
    }
    return Status::OK();
  }
  bool was_pong() const override {
    return was_pong_;
  }
  double rtt() const override {
    return 1;
  }
};

}  // namespace detail
unique_ptr<PingConnection> PingConnection::create_req_pq(unique_ptr<RawConnection> raw_connection, size_t ping_count) {
  return make_unique<detail::PingConnectionReqPQ>(std::move(raw_connection), ping_count);
}
unique_ptr<PingConnection> PingConnection::create_ping_pong(unique_ptr<RawConnection> raw_connection,
                                                            unique_ptr<AuthData> auth_data) {
  return make_unique<detail::PingConnectionPingPong>(std::move(raw_connection), std::move(auth_data));
}
}  // namespace mtproto
}  // namespace td