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//! Cumulative-ack and marker-ack arms.
//!
//! Same discipline and error contract as the sibling operation arms: the
//! crate's total ack selectors classify and commit, the frozen stage-6
//! connection-conversation capacity gate runs at its register position, and
//! request-bound response authorities carry every reply.
//!
//! This file is the LIVE arm of both operations: it reads present state to
//! assemble each selector's classification inputs and it owns the typed impact
//! accounting, which is what makes it the entry point every dispatcher calls.
//! Three submodules carry the rest, split on seams the code already draws:
//! [`commit`] holds the committed arm shared by live and replay, [`replay`]
//! holds the cold-restore drivers that reconstruct a classification from a
//! durable row, and [`binding_fate`] holds the `#26` sealed-token pair whose
//! correctness argument is the contrast between its two members.
mod binding_fate;
mod commit;
mod replay;
use liminal_protocol::lifecycle::{
BindingState, MarkerAckDecision, MarkerProofState, PresentedIdentity, RetainedCausalRecordKind,
SemanticConnectionCapacityDecision, apply_marker_ack,
};
use liminal_protocol::wire::{
BindingEpoch, DeliverySeq, MarkerAck, MarkerAckResponse, ParticipantAck, ParticipantId,
ServerDiscriminant, ServerValue,
};
use crate::server::participant::dispatch_impact::DispatchImpactAccumulator;
use super::barrier::{ArmOutcome, OperationFacts};
use super::facts::Digest;
use super::marker_progress::marker_delivery_progress;
use super::outbox_log::OutboxLog;
use super::state::{ConversationAuthority, DurableAppend, StateError};
use commit::marker_ack_envelope;
impl ConversationAuthority {
#[cfg(test)]
pub(super) fn apply_ack(
&mut self,
request: &ParticipantAck,
operation_facts: &OperationFacts,
appender: &dyn DurableAppend,
) -> Result<ArmOutcome, StateError> {
let mut impact = DispatchImpactAccumulator::new();
self.apply_ack_with_impact(request, operation_facts, appender, &mut impact)
}
/// Applies one cumulative acknowledgement over the zero-debt selector.
pub(super) fn apply_ack_with_impact(
&mut self,
request: &ParticipantAck,
operation_facts: &OperationFacts,
appender: &dyn DurableAppend,
impact: &mut DispatchImpactAccumulator,
) -> Result<ArmOutcome, StateError> {
if self
.obligation_debt_dispatch()
.is_some_and(|state| state.episode().is_some())
{
return self.apply_nonzero_ack_with_impact(request, operation_facts, appender, impact);
}
let receiving_epoch = BindingEpoch::new(
operation_facts.receiving_incarnation,
request.capability_generation,
);
let outbox = self
.outbox
.as_ref()
.ok_or_else(|| StateError::invariant("participant ack outbox owner is absent"))?;
let acknowledged_through = self.slots.get(&request.participant_id).map_or_else(
|| outbox.durable_ack_through(request.participant_id),
|slot| slot.member.cursor(),
);
let (obligations, contiguously_available_through) =
outbox.recipient_ack_obligations(request.participant_id, acknowledged_through)?;
let outcome = self.ack_commit(
request,
receiving_epoch.into(),
&obligations,
contiguously_available_through,
Some((operation_facts, appender)),
)?;
if matches!(outcome.value, ServerValue::AckCommitted(_)) {
self.record_acknowledged(request.participant_id, impact);
self.record_episode_changed(impact);
}
Ok(outcome)
}
/// Applies one marker acknowledgement over the zero-debt marker selector.
pub(super) fn apply_marker_ack_with_impact(
&mut self,
request: &MarkerAck,
operation_facts: &OperationFacts,
outbox_log: &OutboxLog,
impact: &mut DispatchImpactAccumulator,
) -> Result<ArmOutcome, StateError> {
let owed = self
.obligation_debt_dispatch()
.is_some_and(|state| state.episode().is_some());
let receiving_epoch = BindingEpoch::new(
operation_facts.receiving_incarnation,
request.capability_generation,
);
let identity = self
.slots
.get(&request.participant_id)
.map_or(PresentedIdentity::Absent, |slot| {
PresentedIdentity::<Digest, Digest, Digest>::Live(&slot.member)
});
let binding_detached = BindingState::Detached;
let binding = self
.slots
.get(&request.participant_id)
.map_or(&binding_detached, |slot| &slot.binding);
let cursor = self
.slots
.get(&request.participant_id)
.map_or(0, |slot| slot.member.cursor());
let offered = self
.offered_markers
.get(&(request.participant_id, request.marker_delivery_seq))
.filter(|binding_epoch| **binding_epoch == receiving_epoch)
.map(|binding_epoch| (request.marker_delivery_seq, *binding_epoch));
let (expected_marker, delivered_binding_epoch, progress) = match offered {
Some((delivery_seq, binding_epoch)) => (
Some(delivery_seq),
binding_epoch,
Some(marker_delivery_progress(
self,
request.participant_id,
binding_epoch,
delivery_seq,
)?),
),
None => (None, receiving_epoch, None),
};
// The server's half of the frozen selector's AckNoOp arm: a retained
// compaction marker of THIS participant sitting exactly AT the cursor
// was accepted — the cursor can only reach its own marker's sequence
// by a marker-ack or by an ordinary ack crossing it (which retires the
// anchor). A client that still owes the marker-ack (its resume state
// predates the crossing) re-presents it here, and without this flag
// the selector answers MarkerMismatch for an acknowledgement that is
// merely redundant — the 2026-08-07 kernel death.
let accepted_marker_at_cursor =
self.marker_record_accepted_at_cursor(request.participant_id, cursor);
let marker_state = MarkerProofState::new(
cursor,
accepted_marker_at_cursor,
expected_marker,
delivered_binding_epoch,
progress,
);
match apply_marker_ack(identity, binding, receiving_epoch, request, &marker_state) {
MarkerAckDecision::Respond(response) => {
// Same frozen-stage transcription as the normal-ack arm: the
// selector's lookup rows (2-5) precede stage-6 capacity; its
// marker-proof rows (stage 7) follow it.
let stage_seven = matches!(
response.discriminant(),
ServerDiscriminant::AckNoOp
| ServerDiscriminant::MarkerNotDelivered
| ServerDiscriminant::MarkerMismatch
);
if stage_seven {
if let SemanticConnectionCapacityDecision::Respond { limit } =
operation_facts.semantic_connection_capacity()
{
return Ok(ArmOutcome::respond(
MarkerAckResponse::connection_conversation_capacity_exceeded(
marker_ack_envelope(request),
limit,
)
.into_server_value(),
));
}
}
Ok(ArmOutcome::respond(response.into_server_value()))
}
MarkerAckDecision::Commit(commit) => {
let outcome =
self.commit_marker_ack(request, operation_facts, outbox_log, commit)?;
if matches!(outcome.value, ServerValue::MarkerAckCommitted(_)) {
self.record_acknowledged(request.participant_id, impact);
if owed {
self.record_episode_changed(impact);
}
}
Ok(outcome)
}
}
}
/// Answers whether a retained compaction marker owned by this participant
/// sits exactly at the given cursor — the durable fact behind the frozen
/// selector's `accepted_marker_at_cursor` flag. The retained-record census
/// survives restarts, so a marker accepted before a boot is still visible
/// here when its offer entry is not.
///
/// Shared with the credential-attach marker-proof site
/// (`ops_attach_lookup::attach_marker_proof_state`) under board #12: two
/// sites feed one frozen selector the same field, so they derive it from
/// one durable fact rather than each answering for itself.
pub(super) fn marker_record_accepted_at_cursor(
&self,
participant_id: ParticipantId,
cursor: DeliverySeq,
) -> bool {
self.frontier().is_some_and(|owner| {
owner
.frontiers()
.retained_marker_records()
.iter()
.any(|record| {
record.delivery_seq == cursor
&& matches!(
record.kind,
RetainedCausalRecordKind::CompactionMarker { participant_index, .. }
if participant_index == participant_id
)
})
})
}
}