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-rw-r--r--libtransport/src/protocols/rtc.h228
1 files changed, 0 insertions, 228 deletions
diff --git a/libtransport/src/protocols/rtc.h b/libtransport/src/protocols/rtc.h
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index 9f1bcc25b..000000000
--- a/libtransport/src/protocols/rtc.h
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-/*
- * Copyright (c) 2017-2019 Cisco and/or its affiTC_SYNC_STATE
- * 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/datagram_reassembly.h>
-#include <protocols/protocol.h>
-#include <protocols/rtc_data_path.h>
-
-#include <map>
-#include <queue>
-#include <unordered_map>
-
-// algorithm state
-#define HICN_RTC_SYNC_STATE 0
-#define HICN_RTC_NORMAL_STATE 1
-#define HICN_ROUNDS_IN_SYNC_BEFORE_SWITCH 3
-
-// packet constants
-#define HICN_INIT_PACKET_SIZE 1300 // bytes
-#define HICN_PACKET_HEADER_SIZE 60 // bytes ipv6+tcp
-#define HICN_NACK_HEADER_SIZE 8 // bytes
-#define HICN_TIMESTAMP_SIZE 8 // bytes
-#define HICN_RTC_INTEREST_LIFETIME 1000 // ms
-
-// rtt measurement
-// normal interests for data goes from 0 to
-// HICN_MIN_PROBE_SEQ, the rest is reserverd for
-// probes
-#define HICN_MIN_PROBE_SEQ 0xefffffff
-#define HICN_MAX_PROBE_SEQ 0xffffffff
-
-// controller constant
-#define HICN_ROUND_LEN \
- 200 // ms interval of time on which
- // we take decisions / measurements
-#define HICN_MAX_RTX 10
-#define HICN_MAX_RTX_SIZE 1024
-#define HICN_MAX_RTX_MAX_AGE 10000
-#define HICN_MIN_RTT_WIN 30 // rounds
-#define HICN_MIN_INTER_ARRIVAL_GAP 100 // ms
-
-// cwin
-#define HICN_INITIAL_CWIN 1 // packets
-#define HICN_INITIAL_CWIN_MAX 100000 // packets
-#define HICN_MIN_CWIN 10 // packets
-#define HICN_WIN_INCREASE_FACTOR 1.5
-#define HICN_WIN_DECREASE_FACTOR 0.9
-
-// statistics constants
-#define HICN_BANDWIDTH_SLACK_FACTOR 1.8
-#define HICN_ESTIMATED_BW_ALPHA 0.7
-#define HICN_ESTIMATED_PACKET_SIZE 0.7
-#define HICN_ESTIMATED_LOSSES_ALPHA 0.8
-#define HICN_INTEREST_LIFETIME_REDUCTION_FACTOR 0.8
-
-// other constants
-#define HICN_NANO_IN_A_SEC 1000000000
-#define HICN_MICRO_IN_A_SEC 1000000
-#define HICN_MILLI_IN_A_SEC 1000
-
-namespace transport {
-
-namespace protocol {
-
-enum packetState { sent_, nacked_, received_, timeout1_, timeout2_, lost_ };
-
-typedef enum packetState packetState_t;
-
-struct sentInterest {
- uint64_t transmissionTime;
- uint32_t sequence; // sequence number of the interest sent
- // to handle seq % buffer_size
- packetState_t state; // see packet state
-};
-
-class RTCTransportProtocol : public TransportProtocol,
- public DatagramReassembly {
- public:
- RTCTransportProtocol(implementation::ConsumerSocket *icnet_socket);
-
- ~RTCTransportProtocol();
-
- using TransportProtocol::start;
-
- using TransportProtocol::stop;
-
- void resume() override;
-
- bool verifyKeyPackets() override;
-
- private:
- // algo functions
- void initParams();
- void reset() override;
-
- // CC functions
- void updateDelayStats(const ContentObject &content_object);
- void updateStats(uint32_t round_duration);
- void updateCCState();
- void computeMaxWindow(uint32_t productionRate, uint32_t BDPWin);
- void updateWindow();
- void decreaseWindow();
- void increaseWindow();
- void resetPreviousWindow();
-
- // packet functions
- void sendInterest(Name *interest_name, bool rtx);
- void scheduleNextInterests() override;
- void sentinelTimer();
- void addRetransmissions(uint32_t val);
- void addRetransmissions(uint32_t start, uint32_t stop);
- uint64_t retransmit();
- void checkRtx();
- void probeRtt();
- void newRound();
- void onTimeout(Interest::Ptr &&interest) override;
- bool onNack(const ContentObject &content_object, bool rtx);
- void onContentObject(Interest::Ptr &&interest,
- ContentObject::Ptr &&content_object) override;
- void onPacketDropped(Interest::Ptr &&interest,
- ContentObject::Ptr &&content_object) override {}
- void onReassemblyFailed(std::uint32_t missing_segment) override {}
-
- TRANSPORT_ALWAYS_INLINE virtual void reassemble(
- ContentObject::Ptr &&content_object) override {
- auto read_buffer = content_object->getPayload();
- read_buffer->trimStart(HICN_TIMESTAMP_SIZE);
- Reassembly::read_buffer_ = std::move(read_buffer);
- Reassembly::notifyApplication();
- }
-
- // controller var
- std::unique_ptr<asio::steady_timer> round_timer_;
- unsigned currentState_;
-
- // cwin var
- uint32_t currentCWin_;
- uint32_t maxCWin_;
-
- // names/packets var
- uint32_t actualSegment_;
- uint32_t inflightInterestsCount_;
- // map seq to rtx
- std::map<uint32_t, uint8_t> interestRetransmissions_;
- bool rtx_timer_used_;
- std::unique_ptr<asio::steady_timer> rtx_timer_;
- std::vector<sentInterest> inflightInterests_;
- uint32_t lastSegNacked_; // indicates the segment id in the last received
- // past Nack. we do not ask for retransmissions
- // for samething that is older than this value.
- uint32_t lastReceived_; // segment of the last content object received
- // indicates the base of the window on the client
- uint64_t lastReceivedTime_; // time at which we recevied the
- // lastReceived_ packet
-
- // sentinel
- // if all packets in the window get lost we need something that
- // wakes up our consumer socket. Interest timeouts set to 1 sec
- // expire too late. This timers expire much sooner and if it
- // detects that all the interest in the window may be lost
- // it sends all of them again
- std::unique_ptr<asio::steady_timer> sentinel_timer_;
- uint64_t lastEvent_; // time at which we removed a pending
- // interest from the window
- std::unordered_map<uint32_t, uint8_t> packets_in_window_;
-
- // rtt probes
- // the RTC transport tends to overestimate the RTT
- // du to the production time on the server side
- // once per second we send an interest for wich we know
- // we will get a nack. This nack will keep our estimation
- // close to the reality
- std::unique_ptr<asio::steady_timer> probe_timer_;
- uint64_t time_sent_probe_;
- uint32_t probe_seq_number_;
- bool received_probe_;
-
- uint32_t modMask_;
-
- // stats
- bool firstPckReceived_;
- uint32_t receivedBytes_;
- uint32_t sentInterest_;
- uint32_t receivedData_;
- int32_t packetLost_;
- int32_t lossRecovered_;
- uint32_t firstSequenceInRound_;
- uint32_t highestReceived_;
- double avgPacketSize_;
- bool gotNack_;
- uint32_t gotFutureNack_;
- uint32_t rounds_;
- uint32_t roundsWithoutNacks_;
-
- // we keep track of up two paths (if only one path is in use
- // the two values in the vector will be the same)
- // position 0 stores the path with minRTT
- // position 1 stores the path with maxRTT
- uint32_t producerPathLabels_[2];
-
- std::unordered_map<uint32_t, std::shared_ptr<RTCDataPath>> pathTable_;
- uint32_t roundCounter_;
-
- // CC var
- double estimatedBw_;
- double lossRate_;
- double queuingDelay_;
- unsigned protocolState_;
-
- bool initied;
-};
-
-} // namespace protocol
-
-} // namespace transport