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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <protocols/rtc/rtc_forwarding_strategy.h>
#include <protocols/rtc/rtc_ldr.h>
#include <protocols/rtc/rtc_rc.h>
#include <protocols/rtc/rtc_reassembly.h>
#include <protocols/rtc/rtc_state.h>
#include <protocols/rtc/rtc_verifier.h>
#include <protocols/transport_protocol.h>
#include <unordered_set>
#include <vector>
namespace transport {
namespace protocol {
namespace rtc {
class RTCTransportProtocol : public TransportProtocol {
public:
RTCTransportProtocol(implementation::ConsumerSocket *icnet_socket);
~RTCTransportProtocol();
using TransportProtocol::start;
using TransportProtocol::stop;
void resume() override;
std::size_t transportHeaderLength() override;
auto shared_from_this() { return utils::shared_from(this); }
private:
enum class SyncState { catch_up = 0, in_sync = 1, last };
private:
// setup functions
void initParams();
void reset() override;
void inactiveProducer();
// protocol functions
void discoveredRtt();
void newRound();
// window functions
void computeMaxSyncWindow();
void updateSyncWindow();
void decreaseSyncWindow();
// packet functions
void sendRtxInterest(uint32_t seq);
void sendProbeInterest(uint32_t seq);
void scheduleNextInterests() override;
void onInterestTimeout(Interest::Ptr &interest, const Name &name) override;
void onNack(const ContentObject &content_object);
void onProbe(const ContentObject &content_object);
void onContentObjectReceived(Interest &interest,
ContentObject &content_object,
std::error_code &ec) override;
void onPacketDropped(Interest &interest, ContentObject &content_object,
const std::error_code &reason) override {}
void onReassemblyFailed(std::uint32_t missing_segment) override {}
void processManifest(Interest &interest, ContentObject &manifest);
// interaction with app functions
void sendStatsToApp(uint32_t retx_count, uint32_t received_bytes,
uint32_t sent_interests, uint32_t lost_data,
uint32_t definitely_lost, uint32_t recovered_losses,
uint32_t received_nacks, uint32_t received_fec);
// FEC functions
void onFecPackets(fec::BufferArray &packets);
// Utils
ContentObject::Ptr removeFecHeader(const ContentObject &content_object);
ContentObject::Ptr toContentObject(const Name &name, Packet::Format format,
PayloadType payload_type,
const uint8_t *payload,
std::size_t payload_size,
std::size_t additional_header_size = 0);
// protocol state
bool start_send_interest_;
SyncState current_state_;
// cwin vars
uint32_t current_sync_win_;
uint32_t max_sync_win_;
// round timer
std::unique_ptr<asio::steady_timer> round_timer_;
// scheduler timer (postpone interest sending to explot aggregated interests)
std::unique_ptr<asio::steady_timer> scheduler_timer_;
bool scheduler_timer_on_;
uint64_t last_interest_sent_time_;
uint64_t last_interest_sent_seq_;
// maximum aggregated interest. if the transport is connected to the forwarder
// we cannot use aggregated interests
uint32_t max_aggregated_interest_;
// maximum number of intereset that can be sent in a loop to avoid packets
// dropped by the kernel
uint32_t max_sent_int_;
// pacing timer (do not send too many interests in a short time to avoid
// packet drops in the kernel)
std::unique_ptr<asio::steady_timer> pacing_timer_;
bool pacing_timer_on_;
// timeouts
std::unordered_set<uint32_t> timeouts_or_nacks_;
std::shared_ptr<RTCState> state_;
std::shared_ptr<RTCRateControl> rc_;
std::shared_ptr<RTCLossDetectionAndRecovery> ldr_;
std::shared_ptr<RTCVerifier> verifier_;
// forwarding strategy selection
RTCForwardingStrategy fwd_strategy_;
uint32_t number_;
};
} // namespace rtc
} // namespace protocol
} // namespace transport
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