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//! R-D1 stage-8 capacity pass for the enrollment arm (split from
//! [`super::ops_enroll`] under the 500-code-line lens).
use liminal_protocol::lifecycle::{
EnrollmentCapacityCounters, EnrollmentCapacityDecision, FreshParticipantCapacityCounter,
ReceiptDeadlines, select_enrollment_capacity,
};
use liminal_protocol::wire::{
EnrollmentRequest, EnrollmentResponse, IdentityCapacityExceeded, IdentityCapacityScope,
};
use super::barrier::OperationFacts;
use super::capacity::{
OccupancyEntry, ReservationEffects, ResourceKind, ScopeCounter, ServerCapacity, Stage8Choice,
Stage8Outcome, scope_counter,
};
use super::ops_enroll::enrollment_envelope;
use super::state::{ConversationAuthority, StateError};
impl ConversationAuthority {
/// Runs the stage-8 identity/receipt capacity family for one fresh
/// enrollment: per-conversation occupancies from this authority's own
/// replayed state, server occupancies from the shared ledger, the
/// decision through the crate's verified seven-scope selector, and the
/// reservation applied atomically with the check.
pub(super) fn enrollment_stage8<'cap>(
&mut self,
request: &EnrollmentRequest,
operation_facts: &OperationFacts,
server_capacity: &'cap ServerCapacity,
deadlines: &ReceiptDeadlines,
) -> Result<Stage8Outcome<'cap, EnrollmentResponse, EnrollmentCapacityCounters>, StateError>
{
let now = u128::from(operation_facts.now_ms);
// Request-time expiry of this conversation's retained fingerprints
// before their occupancy is observed (contract R-C0: never a sweep).
self.prune_expired_provenance(now);
let identity_conversation_occupied = self.next_participant;
// The conversation provenance pool is a TRIPWIRE now, not a gate: this
// occupancy is observed and reported, and refuses nothing.
self.observe_conversation_provenance_pool(now)?;
let token = request.enrollment_token.into_bytes();
let effects = ReservationEffects {
conversation_id: self.conversation_id,
identity_reserved: true,
// Board #37: enrollment creates the receipt body but NO retained
// provenance. Nothing has yet verified against the secret this
// receipt mints, so its delivery is unobserved; the fingerprint
// starts occupying only when the first credential attach proves
// possession, and that attach reserves it (`ops_attach_capacity`).
//
// The provenance SCOPES are still checked below, unchanged: the
// frozen R-D1 seven-scope order is contract surface and not this
// lane's to move. Checking a scope this operation no longer fills
// can only refuse early, never admit past a signed cap.
inserts: vec![OccupancyEntry {
expires_at: deadlines.receipt_expires_at(),
conversation_id: self.conversation_id,
participant_id: self.next_participant,
kind: ResourceKind::EnrollmentReceipt,
token,
}],
};
let tripwires = operation_facts.receipt_limits.shared_pool_tripwires;
server_capacity.admit(now, tripwires, effects, |server| {
let counters = match enrollment_scope_counters(
request,
operation_facts,
server,
identity_conversation_occupied,
)? {
Ok(counters) => counters,
Err(response) => return Ok(Stage8Choice::Refuse(response)),
};
// The crate selector owns the in-model full/not-full precedence;
// its Commit value is carried forward as the ledger reservation.
match select_enrollment_capacity(request, counters) {
EnrollmentCapacityDecision::Commit(_) => Ok(Stage8Choice::Admit(counters)),
EnrollmentCapacityDecision::Respond(response) => Ok(Stage8Choice::Refuse(response)),
}
})
}
}
/// Builds the provably empty per-participant counter for a not-yet-minted
/// identity (contract: both per-participant occupancies are necessarily zero
/// under nonzero limits, so these scopes have no enrollment refusal arm).
fn fresh_participant_counter(
limit: u64,
scope: &'static str,
) -> Result<FreshParticipantCapacityCounter, StateError> {
FreshParticipantCapacityCounter::try_new(limit, 0).map_err(|error| {
StateError::invariant(format!(
"validated per-participant {scope} limit rejected: {error:?}"
))
})
}
/// Binds one refusing identity scope to its exact typed wire row.
const fn enrollment_identity_refusal(
request: &EnrollmentRequest,
scope: IdentityCapacityScope,
limit: u64,
occupied: u64,
) -> EnrollmentResponse {
EnrollmentResponse::identity_capacity_exceeded(IdentityCapacityExceeded {
request: enrollment_envelope(request),
scope,
limit,
occupied,
})
}
/// Builds enrollment's two refusable stage-8 scope counters in the frozen
/// order (identity Server, then identity Conversation) plus the two provably
/// empty per-participant window counters.
///
/// # Lane p0-39: what left this function, and what did not
///
/// The three SHARED receipt scopes are gone. They were the only place an
/// honest third party could be refused by someone else's churn, and they now
/// bound retention through their TTL windows with a reporting tripwire instead
/// of a wall.
///
/// The over-limit arm SURVIVES, for identity only. A configured identity limit
/// lowered beneath restored durable occupancy is still outside the crate's
/// occupancy model, and still refuses with its true numbers rather than
/// admitting past a signed cap — identity slots are out of this lane entirely.
/// The first-full precedence walk it needs is preserved with it.
fn enrollment_scope_counters(
request: &EnrollmentRequest,
operation_facts: &OperationFacts,
server: super::capacity::ServerOccupancy,
identity_conversation_occupied: u64,
) -> Result<Result<EnrollmentCapacityCounters, EnrollmentResponse>, StateError> {
let limits = operation_facts.receipt_limits;
let ordered = [
(
limits.identity_server,
server.identity,
IdentityCapacityScope::Server,
),
(
operation_facts.identity_slots,
identity_conversation_occupied,
IdentityCapacityScope::Conversation,
),
];
let mut counters = Vec::with_capacity(ordered.len());
// Contract precedence: "The first full scope returns its named
// IdentityCapacityExceeded; no later occupancy is disclosed." An
// out-of-model over-limit scope must not answer past an earlier in-model
// full scope, so the walk remembers the first exactly-full counter it
// passes and refuses THAT scope when a later over-limit scope ends the
// walk. When every scope is in model, the crate selector below stays the
// sole decision owner.
let mut first_full: Option<(IdentityCapacityScope, u64, u64)> = None;
for (limit, occupied, scope) in ordered {
match scope_counter(limit, occupied)? {
ScopeCounter::Valid(counter) => {
if first_full.is_none() && counter.is_full() {
first_full = Some((scope, counter.limit(), counter.occupied()));
}
counters.push(counter);
}
ScopeCounter::OverLimit { limit, occupied } => {
let (scope, limit, occupied) = first_full.unwrap_or((scope, limit, occupied));
return Ok(Err(enrollment_identity_refusal(
request, scope, limit, occupied,
)));
}
}
}
let [identity_server, identity_conversation]: [liminal_protocol::lifecycle::CapacityCounter;
2] = counters.try_into().map_err(|_| {
StateError::invariant("enrollment stage-8 scope construction lost a counter")
})?;
Ok(Ok(EnrollmentCapacityCounters::new(
identity_server,
identity_conversation,
fresh_participant_counter(limits.live_receipt_participant_window, "live-receipt")?,
fresh_participant_counter(limits.provenance_participant_window, "provenance")?,
)))
}