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tdlib-fork/td/mtproto/PingConnection.h

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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)
//
#pragma once
#include "td/mtproto/AuthKey.h"
#include "td/mtproto/NoCryptoStorer.h"
#include "td/mtproto/RawConnection.h"
#include "td/mtproto/utils.h"
#include "td/utils/buffer.h"
#include "td/utils/port/detail/PollableFd.h"
#include "td/utils/Random.h"
#include "td/utils/Status.h"
#include "td/utils/Time.h"
#include "td/utils/UInt.h"
#include "td/mtproto/mtproto_api.h"
namespace td {
namespace mtproto {
class PingConnection : private RawConnection::Callback {
public:
PingConnection(unique_ptr<RawConnection> raw_connection, size_t ping_count)
: raw_connection_(std::move(raw_connection)), ping_count_(ping_count) {
}
PollableFdInfo &get_poll_info() {
return raw_connection_->get_poll_info();
}
unique_ptr<RawConnection> move_as_raw_connection() {
return std::move(raw_connection_);
}
void close() {
raw_connection_->close();
}
Status flush() {
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 {
return finish_time_ > 0;
}
double rtt() const {
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;
};
} // namespace mtproto
} // namespace td