91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
#pragma once
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#include "./cca.hpp"
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#include <chrono>
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#include <vector>
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struct FlowOnly : public CCAI {
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protected:
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using clock = std::chrono::steady_clock;
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public: // config
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static constexpr float RTT_EMA_ALPHA = 0.001f; // might need change over time
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static constexpr float RTT_UP_MAX = 3.0f; // how much larger a delay can be to be taken into account
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static constexpr float RTT_MAX = 2.f; // maybe larger for tunneled connections
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protected:
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// initialize to low value, will get corrected very fast
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float _fwnd {0.01f * max_byterate_allowed}; // in bytes
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// rtt exponental moving average
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float _rtt_ema {0.1f};
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// list of sequence ids and timestamps of when they where sent (and payload size)
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struct FlyingBunch {
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SeqIDType id;
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float timestamp;
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size_t bytes;
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// set to true if counted as ce or resent due to timeout
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bool ignore {false};
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};
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std::vector<FlyingBunch> _in_flight;
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int64_t _in_flight_bytes {0};
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int32_t _consecutive_events {0};
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clock::time_point _time_start_offset;
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// used to clamp growth rate in the void
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double _time_point_last_update {getTimeNow()};
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protected:
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// make values relative to algo start for readability (and precision)
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// get timestamp in seconds
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double getTimeNow(void) const {
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return std::chrono::duration<double>{clock::now() - _time_start_offset}.count();
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}
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// moving avg over the last few delay samples
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// VERY sensitive to bundling acks
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float getCurrentDelay(void) const override;
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// call updateWindow() to update this value
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float getWindow(void) const override;
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void addRTT(float new_delay);
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void updateWindow(void);
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virtual void onCongestion(void) {};
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// internal logic, calls the onCongestion() event
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void updateCongestion(void);
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public: // api
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FlowOnly(size_t maximum_segment_data_size) : CCAI(maximum_segment_data_size) {}
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virtual ~FlowOnly(void) {}
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// TODO: api for how much data we should send
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// take time since last sent into account
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// respect max_byterate_allowed
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int64_t canSend(float time_delta) override;
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// get the list of timed out seq_ids
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std::vector<SeqIDType> getTimeouts(void) const override;
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int64_t inFlightCount(void) const override;
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int64_t inFlightBytes(void) const override;
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public: // callbacks
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// data size is without overhead
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void onSent(SeqIDType seq, size_t data_size) override;
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void onAck(std::vector<SeqIDType> seqs) override;
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// if discard, not resent, not inflight
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void onLoss(SeqIDType seq, bool discard) override;
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};
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