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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::{mem, time::Instant};
use neqo_common::{qdebug, qinfo, Datagram};
use crate::crypto::CryptoSpace;
/// The number of datagrams that are saved during the handshake when
/// keys to decrypt them are not yet available.
const MAX_SAVED_DATAGRAMS: usize = 4;
pub struct SavedDatagram {
/// The datagram.
pub d: Datagram,
/// The time that the datagram was received.
pub t: Instant,
}
#[derive(Default)]
pub struct SavedDatagrams {
handshake: Vec<SavedDatagram>,
application_data: Vec<SavedDatagram>,
available: Option<CryptoSpace>,
}
impl SavedDatagrams {
fn store(&mut self, cspace: CryptoSpace) -> &mut Vec<SavedDatagram> {
match cspace {
CryptoSpace::Handshake => &mut self.handshake,
CryptoSpace::ApplicationData => &mut self.application_data,
_ => panic!("unexpected space"),
}
}
pub fn save(&mut self, cspace: CryptoSpace, d: Datagram, t: Instant) {
let store = self.store(cspace);
if store.len() < MAX_SAVED_DATAGRAMS {
qdebug!("saving datagram of {} bytes", d.len());
store.push(SavedDatagram { d, t });
} else {
qinfo!("not saving datagram of {} bytes", d.len());
}
}
pub fn make_available(&mut self, cspace: CryptoSpace) {
debug_assert_ne!(cspace, CryptoSpace::ZeroRtt);
debug_assert_ne!(cspace, CryptoSpace::Initial);
if !self.store(cspace).is_empty() {
self.available = Some(cspace);
}
}
pub const fn available(&self) -> Option<CryptoSpace> {
self.available
}
pub fn take_saved(&mut self) -> Vec<SavedDatagram> {
self.available
.take()
.map_or_else(Vec::new, |cspace| mem::take(self.store(cspace)))
}
}