use super::*;
pub(super) struct ChildUnwind<'a> {
pub(super) router: &'a Router,
pub(super) claim: TxClaim,
pub(super) armed: bool,
}
impl Drop for ChildUnwind<'_> {
fn drop(&mut self) {
if self.armed {
let _ = self.router.restore_e2e_child_claim(self.claim);
}
}
}
pub(super) struct ParentLease<'a> {
router: &'a Router,
id: u64,
}
impl Drop for ParentLease<'_> {
fn drop(&mut self) {
if let Some(owner) = self
.router
.state
.lock()
.end_to_end_reliable_tx
.get_mut(&self.id)
{
owner.queued = false;
}
}
}
impl Router {
pub(super) fn lease_e2e_send(&self, id: Option<u64>) -> Option<ParentLease<'_>> {
let id = id?;
self.state
.lock()
.end_to_end_reliable_tx
.get_mut(&id)?
.queued = true;
Some(ParentLease { router: self, id })
}
pub(super) fn e2e_child_owned(
queue: &BoundedDeque<TxQueued>,
side: usize,
parent: u64,
) -> bool {
queue.iter().any(|q| {
q.disposable & TX_E2E_CHILD != 0
&& q.deferred_since_ms == parent
&& matches!(&q.item,RouterTxItem::ToSide{dst,..} if *dst==side)
})
}
pub(super) fn enqueue_e2e_child(
&self,
item: RouterTxItem,
priority: u8,
parent: u64,
#[cfg(feature = "compression")] reservation: &mut Option<
crate::payload_codec::QueueReservation<'_, RouterInner>,
>,
) -> TelemetryResult<()> {
let mut st = self.state.lock();
#[cfg(feature = "compression")]
if let Some(reservation) = reservation {
reservation.release_locked(&mut st);
}
st.push_transmit(TxQueued {
disposable: TX_E2E_CHILD | {
#[cfg(feature = "std")]
{
if completion::is_retry_intent() {
TX_E2E_RETRY
} else {
0
}
}
#[cfg(not(feature = "std"))]
{
0
}
},
item,
ignore_local: true,
priority,
delivery_state: QueuedDelivery::Untracked,
accepted_type: 0,
deferred_since_ms: parent,
retry_after_ms: self.clock.now_ms().saturating_add(1),
})
}
pub(super) fn restore_e2e_child_claim(&self, claim: TxClaim) -> TelemetryResult<()> {
let mut st = self.state.lock();
let Some(index) = st.claim_index(claim.token) else {
return Ok(());
};
st.transmit_queue.update_metadata(index, |q| {
q.delivery_state = QueuedDelivery::Untracked;
q.retry_after_ms = self.clock.now_ms().saturating_add(1);
if let RouterTxItem::ToSide { src, .. } = &mut q.item {
*src = None;
}
});
st.refresh_retry_hint();
Ok(())
}
pub(super) fn finish_e2e_child_claim(
&self,
claim: TxClaim,
parent: u64,
context: &DispatchContext,
ok: bool,
) -> TelemetryResult<()> {
let mut st = self.state.lock();
if let Some(index) = st.claim_index(claim.token) {
if ok && !context.refused {
st.transmit_queue.remove_pos(index);
if context.admitted
&& let Some(owner) = st.end_to_end_reliable_tx.get_mut(&parent)
{
owner.last_send_ms = self.clock.now_ms();
}
} else {
st.transmit_queue.update_metadata(index, |q| {
q.delivery_state = QueuedDelivery::Untracked;
q.retry_after_ms = self.clock.now_ms().saturating_add(1);
if let RouterTxItem::ToSide { src, .. } = &mut q.item {
*src = None;
}
});
}
}
st.refresh_retry_hint();
Ok(())
}
#[cfg(feature = "compression")]
pub(super) fn prepare_e2e_child_for_send(
&self,
claim: TxClaim,
side: usize,
data: &mut RouterItem,
) -> TelemetryResult<()> {
let mut reservation = self.prepare_queued_payload(side, data)?;
if reservation.is_none() {
return Ok(());
}
let mut st = self.state.lock();
if let Some(reservation) = &mut reservation {
reservation.release_locked(&mut st);
}
let Some(index) = st.claim_index(claim.token) else {
return Err(TelemetryError::Io("side tx busy"));
};
let old = st.transmit_queue.get(index).expect("claimed child");
let old_cost = old.byte_cost();
let mut replacement = old.clone();
let RouterTxItem::ToSide { data: retained, .. } = &mut replacement.item else {
return Err(TelemetryError::BadArg);
};
*retained = data.clone();
#[cfg(feature = "compact-packet-store")]
replacement.park_for_queue()?;
let cost = replacement.byte_cost();
if st
.shared_queue_bytes_used()
.saturating_sub(old_cost)
.saturating_add(cost)
> st.memory.max_queue_budget
{
return Err(TelemetryError::Io("memory pressure"));
}
let RouterTxItem::ToSide { data: prepared, .. } = &replacement.item else {
unreachable!()
};
let prepared = prepared.clone();
st.transmit_queue
.update_admitted(index, cost, |owner| *owner = replacement)?;
*data = prepared;
Ok(())
}
}