Struct webrtc_sctp::stack::recvtracker::RecvTracker

pub struct RecvTracker { /* fields omitted */ }

Track received TSNs and produce SACK chunks when needed. This struct currently uses a BTreeSet to track gap ack blocks (non-consecutive TSN ranges), which may be overkill for this application since the number of such blocks will likely be small in the common case. Realistically, we won't be able to report more than 368 gap blocks in a SACK given an MTU of 1500, although we may internally track a much larger number.

TODO: Try implementations with Vec instead of BTreeSet to measure performance in common cases. TODO: Consider limiting the number of gaps so a malicious peer can't exhaust our memory with a carefully constructed series of discontinuous TSNs. This may not be a problem, though, since the receive window should naturally bound the size.

TODO: a_rwnd calculation

Methods

impl RecvTracker

pub fn new(initial_tsn: TSN, initial_rwnd: u32) -> RecvTracker

pub fn buffer_tracker(&self) -> &BufferTracker

pub fn track(&mut self, data: &DataChunk) -> bool

Return false if this is a duplicate chunk.

pub fn seen(&self, tsn: TSN) -> bool

pub fn is_complete(&self) -> bool

pub fn rwnd(&self) -> u32

pub fn sack(&mut self) -> SackChunk

Trait Implementations

impl Debug for RecvTracker

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.