68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
#pragma once
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#include <vector>
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#include <cstdint>
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#include <cstddef>
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// TODO: refactor, more state tracking in ccai and seperate into flow and congestion algos
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inline bool isSkipSeqID(const std::pair<uint8_t, uint16_t>& a, const std::pair<uint8_t, uint16_t>& b) {
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// this is not perfect, would need more ft id based history
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if (a.first != b.first) {
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return false; // we dont know
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} else {
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return a.second+1 != b.second;
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}
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}
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struct CCAI {
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public: // config
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using SeqIDType = std::pair<uint8_t, uint16_t>; // tf_id, seq_id
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static constexpr size_t IPV4_HEADER_SIZE {20};
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static constexpr size_t IPV6_HEADER_SIZE {40}; // bru
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static constexpr size_t UDP_HEADER_SIZE {8};
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// TODO: tcp AND IPv6 will be different
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static constexpr size_t SEGMENT_OVERHEAD {
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4+ // ft overhead
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46+ // tox?
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UDP_HEADER_SIZE+
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IPV4_HEADER_SIZE
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};
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// TODO: make configurable, set with tox ngc lossy packet size
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//const size_t MAXIMUM_SEGMENT_DATA_SIZE {1000-4};
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const size_t MAXIMUM_SEGMENT_DATA_SIZE {500-4};
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const size_t MAXIMUM_SEGMENT_SIZE {MAXIMUM_SEGMENT_DATA_SIZE + SEGMENT_OVERHEAD}; // tox 500 - 4 from ft
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//static_assert(maximum_segment_size == 574); // mesured in wireshark
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// flow control
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float max_byterate_allowed {10*1024*1024}; // 10MiB/s
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public: // api
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CCAI(size_t maximum_segment_data_size) : MAXIMUM_SEGMENT_DATA_SIZE(maximum_segment_data_size) {}
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// return the current believed window in bytes of how much data can be inflight,
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//virtual float getCWnD(void) const = 0;
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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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virtual size_t canSend(void) = 0;
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// get the list of timed out seq_ids
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virtual std::vector<SeqIDType> getTimeouts(void) const = 0;
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public: // callbacks
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// data size is without overhead
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virtual void onSent(SeqIDType seq, size_t data_size) = 0;
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// TODO: copy???
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virtual void onAck(std::vector<SeqIDType> seqs) = 0;
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// if discard, not resent, not inflight
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virtual void onLoss(SeqIDType seq, bool discard) = 0;
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};
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