7ce645f1dc
A group restore re-establishes a committed boundary this epoch did not run a transition into, so its snapshot carries no decision and no controls for any agent, and a fresh epoch is a new compositionDigest, so the descriptor takes the next revision rather than republishing revision 1 with different contents. CommittedSnapshot's rule becomes: null at boundary 0 and at an installed boundary, always together, and for every agent or none -- a snapshot where one fly acted and another did not would be two boundaries in one value. Dated amendment to publishing-v1 section 3, with the schema set, the fixtures and the TypeScript package moved together and the digest regenerated.
1212 lines
44 KiB
Rust
1212 lines
44 KiB
Rust
//! PUBLISH-01 acceptance: committed snapshots, observer isolation and the repair path.
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//!
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//! Every test here is one of the slice's acceptance bullets, or one sentence of
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//! `publishing-v1` the session now enforces. The boundary itself is `fly_session::publish`:
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//! the same bus, named delivery policies, named outcomes, and a fake multi-agent consumer that
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//! is an ordinary subscriber. No public v2 wire schema is exercised, because none is approved.
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mod common;
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use std::collections::BTreeMap;
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use std::time::Duration;
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use common::{Fixture, default_fixture, fixture, fly_a, fly_b, mode_fixture, within};
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use fly_session::coordinator::{DESCRIPTOR_REVISION, Injections};
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use fly_session::harness::{AgentSpec, ExecutionMode, HarnessConfig, Via};
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use fly_session::publish::{
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ApplicationChannel, ConsumerOutcome, Delivery, EVENT_BATCH_DEPTH, EventOutbox, GET_SNAPSHOT,
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PresentationConsumer, PublicationOutcome, TopicPolicy, check_publication, query_service,
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};
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use fly_session::types::*;
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use serde_json::json;
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both_transports!(
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a_consumer_that_disconnects_neither_advances_nor_stalls_the_world,
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a_consumer_that_stops_consuming_costs_only_its_own_credits,
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a_bounded_observer_refusal_is_named_and_never_fails_the_epoch,
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every_published_snapshot_carries_its_own_boundarys_media,
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a_published_frame_from_another_boundary_is_refused,
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a_published_handle_that_is_not_the_referenced_artifact_is_refused,
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an_unheld_descriptor_revision_is_repaired_rather_than_inferred,
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a_revision_that_was_never_published_is_a_named_answer,
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a_changed_index_digest_is_named_rather_than_remapped,
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boundary_zero_publishes_no_decision_and_no_controls,
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a_committed_action_is_the_transition_that_just_ended,
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one_snapshot_carries_every_agent_in_the_composition,
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application_state_and_cues_are_the_applications_own,
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a_refused_event_batch_is_held_and_counted_not_lost,
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the_query_service_answers_reads_and_nothing_else,
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the_published_descriptor_is_what_the_workers_attested_to,
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a_stimulus_kind_the_descriptor_does_not_declare_is_refused,
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a_restored_boundary_publishes_a_new_revision_and_no_transition,
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);
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all_modes!(
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the_publication_boundary_holds_in_every_execution_mode,
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a_stalled_observer_never_moves_the_world_in_any_execution_mode,
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);
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const STEPS: u64 = 4;
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/// Polls until `ok` holds, so a test never asserts something that has not happened yet.
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async fn until(what: &str, mut ok: impl FnMut() -> bool) {
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let deadline = std::time::Instant::now() + Duration::from_secs(10);
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while !ok() {
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assert!(
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std::time::Instant::now() < deadline,
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"{what}: never happened"
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);
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tokio::time::sleep(Duration::from_millis(5)).await;
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}
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}
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/// A started session at Ready(0), with boundary 0 already published.
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async fn started(via: Via) -> Fixture {
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let mut f = default_fixture(via).await;
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f.harness
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.coordinator
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.bootstrap()
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.await
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.expect("the session bootstraps");
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f
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}
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async fn started_in_mode(mode: ExecutionMode) -> Fixture {
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let mut f = mode_fixture(mode, HarnessConfig::default()).await;
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f.harness
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.coordinator
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.bootstrap()
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.await
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.expect("the session bootstraps");
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f
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}
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/// Reads snapshots until the consumer reports the boundary it is waiting for.
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async fn read_until(consumer: &mut PresentationConsumer, boundary: u64) -> u64 {
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loop {
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match within("a snapshot", consumer.take_snapshot()).await {
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Some(ConsumerOutcome::Read { boundary: at, .. }) if at >= boundary => return at,
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Some(ConsumerOutcome::Read { .. }) => {}
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other => panic!("expected a readable snapshot, got {other:?}"),
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}
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}
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}
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// ------------------------------------------------------------------------------------------
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// "A browser consumer disconnecting, or applying backpressure, never advances the world and
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// never stalls it."
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/// A consumer that goes away mid-run. The world takes exactly the steps it was asked for.
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async fn a_consumer_that_disconnects_neither_advances_nor_stalls_the_world(via: Via) {
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let mut f = started(via).await;
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let mut consumer = f.harness.consumer().await.expect("a consumer attaches");
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assert!(matches!(
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within("the descriptor", consumer.take_descriptor()).await,
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Some(ConsumerOutcome::Composition { revision, .. }) if revision == DESCRIPTOR_REVISION
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));
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f.harness.coordinator.run(1).await.expect("one transition");
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read_until(&mut consumer, 1).await;
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// The browser goes away. Nothing in the session is told, and nothing waits for it.
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drop(consumer);
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let started_at = std::time::Instant::now();
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let before = f.harness.coordinator.stats();
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f.harness
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.coordinator
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.run(STEPS)
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.await
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.expect("the world carries on");
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let after = f.harness.coordinator.stats();
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assert_eq!(
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after.advances - before.advances,
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STEPS,
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"a departed observer neither added a world step nor removed one"
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);
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assert_eq!(after.publications - before.publications, STEPS);
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assert!(
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!f.harness.coordinator.is_fenced(),
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"a departed observer never fences an epoch"
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);
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assert!(
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started_at.elapsed() < Duration::from_secs(10),
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"a departed observer never stalls the world"
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);
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assert_eq!(f.harness.coordinator.ledger().refusals(), 0);
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f.shutdown().await;
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}
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/// A viewer that holds its deliveries and stops rendering. Its own credits run out; the
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/// world's boundaries do not.
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async fn a_consumer_that_stops_consuming_costs_only_its_own_credits(via: Via) {
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let mut f = started(via).await;
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let mut slow = f
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.harness
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.consumer()
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.await
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.expect("a slow consumer attaches");
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let mut healthy = f
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.harness
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.consumer()
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.await
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.expect("a healthy consumer attaches");
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// The slow one takes its deliveries and never releases them: a viewer holding output.
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until("the slow viewer has a delivery", || {
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slow.try_hold_snapshot()
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})
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.await;
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while slow.try_hold_snapshot() && slow.held() < 4 {}
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let held = slow.held();
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assert!(held > 0);
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f.harness
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.coordinator
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.run(STEPS)
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.await
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.expect("the world carries on");
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assert_eq!(f.harness.coordinator.stats().advances, STEPS);
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assert_eq!(
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f.harness.coordinator.ledger().refusals(),
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0,
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"a latest subscriber cannot refuse"
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);
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assert_eq!(
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slow.held(),
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held,
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"the slow viewer took nothing more once its credits were gone"
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);
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// The healthy one is unaffected and reads the newest boundary.
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assert!(matches!(
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within("the descriptor", healthy.take_descriptor()).await,
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Some(ConsumerOutcome::Composition { .. })
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));
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let at = read_until(&mut healthy, STEPS).await;
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assert_eq!(at, STEPS);
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assert_eq!(
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healthy.last().expect("a snapshot").boundary,
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STEPS,
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"the healthy consumer reads the newest boundary while the slow one holds"
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);
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f.shutdown().await;
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}
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/// A bounded subscriber whose queue is full refuses a publication -- `bus-v1` section 6 says
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/// it may. The refusal is a named outcome on a named topic, the world takes every step it was
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/// asked for, the epoch is not fenced, and when the offender goes away the next boundary
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/// reaches the well-behaved consumer.
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async fn a_bounded_observer_refusal_is_named_and_never_fails_the_epoch(via: Via) {
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let mut f = started(via).await;
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let healthy_first = f
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.harness
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.consumer()
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.await
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.expect("a healthy consumer attaches");
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let offender_client = f.harness.observer().await.expect("an observer client");
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let snapshots = f.harness.coordinator.topics().snapshots.clone();
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let mut offender = offender_client
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.subscribe(
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&snapshots,
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flybus::SubscriptionConfig::bounded().queued(1).in_flight(1),
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)
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.await
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.expect("a bounded subscription");
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let before = f.harness.coordinator.stats().advances;
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f.harness
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.coordinator
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.run(STEPS)
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.await
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.expect("an observer never fails the epoch");
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assert_eq!(
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f.harness.coordinator.stats().advances - before,
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STEPS,
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"a refused publication never costs the world a step"
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);
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assert!(!f.harness.coordinator.is_fenced());
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let counters = f.harness.coordinator.ledger().counters(&snapshots);
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assert!(
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counters.refused > 0,
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"the refusal is counted on its own topic: {counters:?}"
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);
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assert!(
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matches!(
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f.harness.coordinator.ledger().last(),
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Some(PublicationOutcome::RefusedByObserver { .. })
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),
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"the last outcome names the refusal rather than defaulting to success"
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);
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assert_eq!(
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counters.faulted, 0,
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"an observer's refusal is never the session's fault"
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);
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// The offender leaves. The next boundary is published and the healthy consumer reads it.
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drop(offender.try_next());
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drop(offender);
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offender_client.close().await;
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drop(healthy_first);
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let mut healthy = f
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.harness
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.consumer()
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.await
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.expect("a healthy consumer attaches");
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until("the refusals stop", || true).await;
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f.harness
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.coordinator
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.run(2)
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.await
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.expect("the world carries on");
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assert!(matches!(
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within("the descriptor", healthy.take_descriptor()).await,
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Some(ConsumerOutcome::Composition { .. })
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));
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let at = read_until(&mut healthy, STEPS + 1).await;
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assert!(
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at > STEPS,
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"a boundary published after the offender left reaches a consumer"
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);
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f.shutdown().await;
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}
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// ------------------------------------------------------------------------------------------
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// "Future agent state is never mixed with old media."
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/// Every snapshot's media belongs to the boundary its agent state belongs to: the frame is the
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/// one this boundary's declared delay requires, the handle is the artifact the payload names,
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/// the audio continues where the last chunk ended, and the agents are committed at it.
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async fn every_published_snapshot_carries_its_own_boundarys_media(via: Via) {
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let mut f = started(via).await;
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let mut consumer = f.harness.consumer().await.expect("a consumer attaches");
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assert!(matches!(
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within("the descriptor", consumer.take_descriptor()).await,
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Some(ConsumerOutcome::Composition { .. })
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));
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let mut seen: Vec<(u64, String)> = Vec::new();
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for step in 1..=STEPS {
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f.harness.coordinator.run(1).await.expect("a transition");
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let at = read_until(&mut consumer, step).await;
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let view = consumer.last().expect("a snapshot");
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assert_eq!(view.boundary, at);
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for reference in &view.views {
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// The counter arena declares no render delay, so the frame of boundary k is
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// produced at k. The consumer checked this itself before it got here.
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assert_eq!(reference.produced_step, at, "the frame is this boundary's");
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let handle = view
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.artifacts
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.get(&fly_session::media::view_attachment(&reference.view_id))
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.expect("the referenced frame has its handle");
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assert_eq!(
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handle.reference(),
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&reference.pixels,
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"the handle is that artifact"
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);
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seen.push((at, reference.pixels.artifact_id.clone()));
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}
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for agent in &view.agents {
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assert!(
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agent.brain_ticks > 0,
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"the agent state is this boundary's, not a placeholder"
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);
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}
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}
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let mut ids: Vec<&String> = seen.iter().map(|(_, id)| id).collect();
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ids.sort();
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ids.dedup();
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assert_eq!(
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ids.len(),
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seen.len(),
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"no boundary republished another boundary's frame: {seen:?}"
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);
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f.shutdown().await;
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}
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/// The injection of new agent state with the previous boundary's frame. The publication is
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/// refused before it reaches a subscriber, and the consumer never sees a mixed boundary.
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async fn a_published_frame_from_another_boundary_is_refused(via: Via) {
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let mut f = started(via).await;
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let mut consumer = f.harness.consumer().await.expect("a consumer attaches");
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f.harness
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.coordinator
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.run(1)
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.await
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.expect("one clean transition");
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f.harness.coordinator.injections = Injections {
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at_step: 1,
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stale_published_view: true,
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..Injections::default()
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};
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let failure = f
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.harness
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.coordinator
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.run(1)
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.await
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.expect_err("a snapshot that mixes boundaries is refused");
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assert_eq!(failure.error.code, ErrorCode::BufferInvalid, "{failure:?}");
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assert!(
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failure.error.message.contains("produced at"),
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"the refusal names the boundary the frame came from: {}",
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failure.error.message
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);
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assert_eq!(
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failure.error.mutation,
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MutationCertainty::None,
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"nothing was published, so nothing downstream saw it"
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);
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// Whatever the consumer read, none of it is the mixed boundary.
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assert!(matches!(
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within("the descriptor", consumer.take_descriptor()).await,
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Some(ConsumerOutcome::Composition { .. })
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));
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until("a snapshot of the clean boundary", || {
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matches!(
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consumer.try_take_snapshot(),
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Some(ConsumerOutcome::Read { boundary: 1, .. })
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)
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})
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.await;
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assert_eq!(consumer.last().expect("a snapshot").boundary, 1);
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|
while let Some(outcome) = consumer.try_take_snapshot() {
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match outcome {
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ConsumerOutcome::Read { boundary, .. } => {
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assert!(boundary <= 1, "the mixed boundary was never published");
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}
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other => panic!("the consumer saw {other:?}"),
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}
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}
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f.shutdown().await;
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}
|
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|
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/// The same attachment names and the same bytes, another object. Only the artifact identity
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/// sees it, and the publication is refused.
|
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async fn a_published_handle_that_is_not_the_referenced_artifact_is_refused(via: Via) {
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let mut f = started(via).await;
|
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f.harness.coordinator.injections = Injections {
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at_step: 0,
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substituted_published_handle: true,
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..Injections::default()
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};
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let failure = f
|
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.harness
|
|
.coordinator
|
|
.run(1)
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.await
|
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.expect_err("a handle that is not the referenced artifact is refused");
|
|
assert_eq!(failure.error.code, ErrorCode::BufferInvalid, "{failure:?}");
|
|
assert!(
|
|
failure.error.message.contains("generation"),
|
|
"the refusal names the object it got: {}",
|
|
failure.error.message
|
|
);
|
|
f.shutdown().await;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------
|
|
// "A descriptor or index mismatch is visible rather than silently tolerated."
|
|
|
|
/// A consumer that meets a revision it does not hold repairs through the query service. It
|
|
/// infers nothing from the snapshot in the meantime.
|
|
async fn an_unheld_descriptor_revision_is_repaired_rather_than_inferred(via: Via) {
|
|
let mut f = started(via).await;
|
|
let mut consumer = f.harness.consumer().await.expect("a consumer attaches");
|
|
f.harness.coordinator.run(1).await.expect("a transition");
|
|
|
|
// The snapshot arrives first: cross-topic ordering is not guaranteed, and this consumer
|
|
// has deliberately not read its descriptor topic.
|
|
let outcome = within("a snapshot", consumer.take_snapshot()).await;
|
|
assert_eq!(
|
|
outcome,
|
|
Some(ConsumerOutcome::UnknownRevision {
|
|
revision: DESCRIPTOR_REVISION
|
|
}),
|
|
"an unknown revision is reported, not guessed"
|
|
);
|
|
assert!(
|
|
consumer.last().is_none(),
|
|
"nothing was read out of a snapshot it cannot shape"
|
|
);
|
|
|
|
let repaired = consumer
|
|
.repair(DESCRIPTOR_REVISION)
|
|
.await
|
|
.expect("the repair path answers");
|
|
assert_eq!(repaired, DESCRIPTOR_REVISION);
|
|
assert_eq!(consumer.repairs(), 1);
|
|
f.harness.coordinator.run(1).await.expect("a transition");
|
|
let at = read_until(&mut consumer, 1).await;
|
|
assert!(at >= 1, "with the descriptor in hand the same stream reads");
|
|
f.shutdown().await;
|
|
}
|
|
|
|
/// A revision this session never published is an answer, not an empty result.
|
|
async fn a_revision_that_was_never_published_is_a_named_answer(via: Via) {
|
|
let f = started(via).await;
|
|
let mut consumer = f.harness.consumer().await.expect("a consumer attaches");
|
|
let error = consumer
|
|
.repair(99)
|
|
.await
|
|
.expect_err("revision 99 was never published");
|
|
assert_eq!(error.code, ErrorCode::IdentityMismatch, "{error:?}");
|
|
assert!(error.message.contains("99"), "{}", error.message);
|
|
assert_eq!(
|
|
error.mutation,
|
|
MutationCertainty::None,
|
|
"a read never mutates"
|
|
);
|
|
f.shutdown().await;
|
|
}
|
|
|
|
/// The same neuron count, another index. A consumer that has mapped geometry is told, and the
|
|
/// new composition is not quietly cached over the one it mapped.
|
|
async fn a_changed_index_digest_is_named_rather_than_remapped(via: Via) {
|
|
// Two real compositions that differ only in the graph one fly built.
|
|
let first = started(via).await;
|
|
let mut second = fixture(
|
|
via,
|
|
HarnessConfig {
|
|
agents: vec![
|
|
AgentSpec {
|
|
graph_variant: 1,
|
|
..AgentSpec::new("fly-a", "p1", 7)
|
|
},
|
|
AgentSpec {
|
|
graph_variant: 0,
|
|
..AgentSpec::new("fly-b", "p2", 11)
|
|
},
|
|
],
|
|
..HarnessConfig::default()
|
|
},
|
|
)
|
|
.await;
|
|
second
|
|
.harness
|
|
.coordinator
|
|
.bootstrap()
|
|
.await
|
|
.expect("the second session bootstraps");
|
|
let revised = {
|
|
let mut revised = second
|
|
.harness
|
|
.coordinator
|
|
.session_descriptor()
|
|
.expect("a published descriptor")
|
|
.clone();
|
|
revised.revision = DESCRIPTOR_REVISION + 1;
|
|
revised
|
|
};
|
|
let original = first
|
|
.harness
|
|
.coordinator
|
|
.session_descriptor()
|
|
.expect("a published descriptor")
|
|
.clone();
|
|
let moved = original
|
|
.agents
|
|
.iter()
|
|
.find(|a| a.agent_id == fly_a())
|
|
.expect("fly-a");
|
|
let arrived = revised
|
|
.agents
|
|
.iter()
|
|
.find(|a| a.agent_id == fly_a())
|
|
.expect("fly-a");
|
|
assert_eq!(
|
|
moved.neuron_count, arrived.neuron_count,
|
|
"the same number of neurons"
|
|
);
|
|
assert_ne!(
|
|
moved.index_digest, arrived.index_digest,
|
|
"and another index"
|
|
);
|
|
|
|
let mut consumer = first.harness.consumer().await.expect("a consumer attaches");
|
|
let held = match within("the descriptor", consumer.take_descriptor()).await {
|
|
Some(ConsumerOutcome::Composition { revision, .. }) => revision,
|
|
other => panic!("expected a composition, got {other:?}"),
|
|
};
|
|
consumer
|
|
.map_geometry(held)
|
|
.expect("this consumer maps geometry");
|
|
assert_eq!(consumer.mapped_index(&fly_a()), Some(&moved.index_digest));
|
|
|
|
// The composition changes under it.
|
|
let publisher_client = first
|
|
.harness
|
|
.publisher()
|
|
.await
|
|
.expect("a publishing client");
|
|
let mut publisher = fly_session::publish::Publisher::new(
|
|
publisher_client,
|
|
&first.harness.config.session_id,
|
|
&first.harness.config.epoch,
|
|
first.harness.coordinator.topics(),
|
|
);
|
|
publisher
|
|
.publish_descriptor(&revised)
|
|
.await
|
|
.expect("the revision publishes");
|
|
let outcome = within("the revised descriptor", consumer.take_descriptor()).await;
|
|
assert_eq!(
|
|
outcome,
|
|
Some(ConsumerOutcome::IndexChanged {
|
|
agent_id: fly_a(),
|
|
from: moved.index_digest.clone(),
|
|
to: arrived.index_digest.clone(),
|
|
}),
|
|
"the change is named"
|
|
);
|
|
assert_eq!(
|
|
consumer.mapped_index(&fly_a()),
|
|
Some(&moved.index_digest),
|
|
"and nothing was remapped behind the consumer's back"
|
|
);
|
|
assert!(
|
|
consumer.descriptor(DESCRIPTOR_REVISION + 1).is_none(),
|
|
"the revision it refused is not in its cache either"
|
|
);
|
|
second.shutdown().await;
|
|
first.shutdown().await;
|
|
}
|
|
|
|
/// The descriptor says what the workers said, not what the composition asked for.
|
|
async fn the_published_descriptor_is_what_the_workers_attested_to(via: Via) {
|
|
let f = started(via).await;
|
|
let descriptor = f
|
|
.harness
|
|
.coordinator
|
|
.session_descriptor()
|
|
.expect("a descriptor")
|
|
.clone();
|
|
assert_eq!(descriptor.revision, DESCRIPTOR_REVISION);
|
|
assert_eq!(descriptor.agents.len(), 2);
|
|
for agent in &descriptor.agents {
|
|
let expected = fly_session::agent::synthetic_graph(&agent.agent_id, 0);
|
|
assert_eq!(
|
|
agent.index_digest, expected.index_digest,
|
|
"the fly's own index"
|
|
);
|
|
assert_eq!(agent.dataset_digest, expected.dataset_digest);
|
|
assert_eq!(agent.neuron_count, expected.neuron_count);
|
|
assert_eq!(
|
|
agent.rate_roles, expected.rate_roles,
|
|
"the profile's rate order"
|
|
);
|
|
assert_eq!(agent.supported_stimuli, expected.supported_stimuli);
|
|
assert!(
|
|
descriptor.environment.port(&agent.port_id).is_some(),
|
|
"every agent's port is declared by the environment"
|
|
);
|
|
}
|
|
let mut asset_ids: Vec<&Id> = descriptor.assets.iter().map(|a| &a.id).collect();
|
|
asset_ids.sort();
|
|
asset_ids.dedup();
|
|
assert_eq!(
|
|
asset_ids.len(),
|
|
descriptor.assets.len(),
|
|
"assets are unique by id"
|
|
);
|
|
f.shutdown().await;
|
|
}
|
|
|
|
/// `supportedStimuli` is enforced, not advertised: a kind outside the list the descriptor
|
|
/// publishes is refused before the model is touched, so the declaration is worth reading.
|
|
async fn a_stimulus_kind_the_descriptor_does_not_declare_is_refused(via: Via) {
|
|
let mut f = started(via).await;
|
|
let declared = f
|
|
.harness
|
|
.coordinator
|
|
.session_descriptor()
|
|
.expect("a descriptor")
|
|
.agents
|
|
.iter()
|
|
.find(|a| a.agent_id == fly_a())
|
|
.expect("fly-a")
|
|
.supported_stimuli
|
|
.clone();
|
|
assert!(!declared.contains(&id("arena.undeclared")), "{declared:?}");
|
|
|
|
// A clean transition first, so the refusal is the injection and not the composition.
|
|
f.harness.coordinator.run(1).await.expect("one clean transition");
|
|
let before = f.harness.coordinator.stats().advances;
|
|
f.harness.coordinator.injections = Injections {
|
|
at_step: 1,
|
|
undeclared_stimulus: true,
|
|
..Injections::default()
|
|
};
|
|
let failure = f
|
|
.harness
|
|
.coordinator
|
|
.run(1)
|
|
.await
|
|
.expect_err("an undeclared stimulus kind is refused");
|
|
assert_eq!(failure.error.code, ErrorCode::Unsupported, "{failure:?}");
|
|
assert_eq!(
|
|
failure.error.mutation,
|
|
MutationCertainty::None,
|
|
"refused before the model is touched"
|
|
);
|
|
assert!(
|
|
failure.error.message.contains("arena.undeclared"),
|
|
"the refusal names the kind: {}",
|
|
failure.error.message
|
|
);
|
|
assert!(failure.participant.is_some(), "and the participant it came from");
|
|
assert_eq!(
|
|
f.harness.coordinator.stats().advances,
|
|
before,
|
|
"the refused transition never completed, so no boundary was added"
|
|
);
|
|
assert!(
|
|
f.harness.coordinator.is_fenced(),
|
|
"a commit that refused after the world moved fences the epoch"
|
|
);
|
|
f.shutdown().await;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------
|
|
// "A committed action is labelled as the transition that just ended, not the one about to
|
|
// start."
|
|
|
|
async fn boundary_zero_publishes_no_decision_and_no_controls(via: Via) {
|
|
let f = started(via).await;
|
|
let state = f.harness.coordinator.published_state();
|
|
let snapshot = {
|
|
let state = state.lock().expect("not poisoned");
|
|
state
|
|
.latest_snapshot()
|
|
.expect("boundary 0 was published")
|
|
.clone()
|
|
};
|
|
assert_eq!(snapshot.scope.step, 0);
|
|
for agent in &snapshot.agents {
|
|
assert!(
|
|
agent.selected_decision.is_none(),
|
|
"boundary 0 ended no transition"
|
|
);
|
|
assert!(agent.applied_controls.is_none());
|
|
}
|
|
f.shutdown().await;
|
|
}
|
|
|
|
/// The decision published at boundary k+1 is the one the agent prepared for the transition
|
|
/// k -> k+1, never the one it is about to prepare for k+1 -> k+2.
|
|
async fn a_committed_action_is_the_transition_that_just_ended(via: Via) {
|
|
let mut f = started(via).await;
|
|
let mut consumer = f.harness.consumer().await.expect("a consumer attaches");
|
|
assert!(matches!(
|
|
within("the descriptor", consumer.take_descriptor()).await,
|
|
Some(ConsumerOutcome::Composition { .. })
|
|
));
|
|
let mut published: Vec<(u64, Digest)> = Vec::new();
|
|
for step in 1..=STEPS {
|
|
f.harness.coordinator.run(1).await.expect("a transition");
|
|
read_until(&mut consumer, step).await;
|
|
let view = consumer.last().expect("a snapshot");
|
|
let agent = view.agent(&fly_a()).expect("fly-a is in every snapshot");
|
|
let decision = agent
|
|
.decision
|
|
.as_ref()
|
|
.expect("past boundary 0 there is a decision");
|
|
published.push((view.boundary, typed_digest(decision)));
|
|
assert!(
|
|
agent.controls.is_some(),
|
|
"and the controls that were applied"
|
|
);
|
|
}
|
|
// The trace records, per transition, the decision digest the coordinator actually sent to
|
|
// the world. The snapshot at boundary k+1 must carry the transition ending there.
|
|
let trace = &f.harness.coordinator.trace.transitions;
|
|
assert_eq!(trace.len() as u64, STEPS);
|
|
for (index, (boundary, digest)) in published.iter().enumerate() {
|
|
let transition = &trace[index];
|
|
assert_eq!(
|
|
transition.behaviour.published_boundary, *boundary,
|
|
"the snapshot at {boundary} is the transition that ended there"
|
|
);
|
|
let traced = transition
|
|
.behaviour
|
|
.agents
|
|
.iter()
|
|
.find(|a| a.agent_id == fly_a())
|
|
.expect("fly-a in the trace");
|
|
assert_eq!(
|
|
traced.decision_digest, *digest,
|
|
"the decision published at boundary {boundary} is the one that produced it"
|
|
);
|
|
assert_eq!(traced.committed_step, *boundary);
|
|
}
|
|
// And it is not the next transition's, which the following trace row holds.
|
|
if STEPS > 1 {
|
|
let first = &published[0];
|
|
let next = trace[1]
|
|
.behaviour
|
|
.agents
|
|
.iter()
|
|
.find(|a| a.agent_id == fly_a())
|
|
.expect("fly-a in the trace");
|
|
assert_ne!(
|
|
first.1, next.decision_digest,
|
|
"boundary 1 did not publish the decision of the transition about to start"
|
|
);
|
|
}
|
|
f.shutdown().await;
|
|
}
|
|
|
|
/// One snapshot is the whole composition: a presentation consumer is a multi-agent consumer
|
|
/// and has no per-fly stream to join.
|
|
async fn one_snapshot_carries_every_agent_in_the_composition(via: Via) {
|
|
let mut f = started(via).await;
|
|
let mut consumer = f.harness.consumer().await.expect("a consumer attaches");
|
|
assert!(matches!(
|
|
within("the descriptor", consumer.take_descriptor()).await,
|
|
Some(ConsumerOutcome::Composition { .. })
|
|
));
|
|
f.harness.coordinator.run(1).await.expect("a transition");
|
|
let outcome = match within("a snapshot", consumer.take_snapshot()).await {
|
|
Some(outcome) => outcome,
|
|
None => panic!("the snapshot stream ended"),
|
|
};
|
|
let agents = match outcome {
|
|
ConsumerOutcome::Read { agents, .. } => agents,
|
|
other => panic!("expected a readable snapshot, got {other:?}"),
|
|
};
|
|
assert_eq!(agents, vec![fly_a(), fly_b()], "every agent, in one value");
|
|
let view = consumer.last().expect("a snapshot");
|
|
for agent_id in [fly_a(), fly_b()] {
|
|
let agent = view.agent(&agent_id).expect("in the snapshot");
|
|
assert_eq!(
|
|
agent.rates.len(),
|
|
2,
|
|
"telemetry in the descriptor's rate-role order"
|
|
);
|
|
assert_eq!(agent.rates[0].0, id("kc"));
|
|
assert_eq!(agent.rates[1].0, id("mbon"));
|
|
assert!(!agent.index_digest.is_empty());
|
|
}
|
|
f.shutdown().await;
|
|
}
|
|
|
|
/// A group restore re-establishes a committed boundary this epoch did not run a transition
|
|
/// into. Two things follow, and both are published rather than inferred: the composition is a
|
|
/// new one, because a fresh epoch is a new `compositionDigest`, so the descriptor takes the
|
|
/// next revision; and the restored boundary carries no decision and no controls for any agent,
|
|
/// because the abandoned epoch's actions are not this session's to republish.
|
|
async fn a_restored_boundary_publishes_a_new_revision_and_no_transition(via: Via) {
|
|
let mut f = started(via).await;
|
|
let checkpoint = id("ck-1");
|
|
f.harness.coordinator.run(1).await.expect("one transition");
|
|
let outcome = within("checkpoint", f.harness.coordinator.checkpoint(&checkpoint))
|
|
.await
|
|
.expect("a committed checkpoint");
|
|
assert!(matches!(outcome, fly_session::state::SaveOutcome::Committed { .. }), "{outcome:?}");
|
|
let first = f.harness.coordinator.descriptor_revision();
|
|
|
|
// The snapshot of a boundary this epoch produced does carry the transition.
|
|
let produced = {
|
|
let state = f.harness.coordinator.published_state();
|
|
let state = state.lock().expect("not poisoned");
|
|
state.latest_snapshot().expect("boundary 1").clone()
|
|
};
|
|
assert_eq!(produced.scope.step, 1);
|
|
assert!(produced.agents.iter().all(|a| a.selected_decision.is_some()));
|
|
|
|
// Fail the epoch and restore into a fresh one.
|
|
f.harness.kill(&fly_a()).await;
|
|
f.harness.coordinator.step().await.expect_err("a dead participant fails the epoch");
|
|
within("replace", f.harness.replace_all_participants())
|
|
.await
|
|
.expect("replacements");
|
|
within(
|
|
"restore",
|
|
f.harness.coordinator.restore(Some(&checkpoint), &id("e2")),
|
|
)
|
|
.await
|
|
.expect("a coherent group restore");
|
|
|
|
assert_eq!(
|
|
f.harness.coordinator.descriptor_revision(),
|
|
first + 1,
|
|
"a fresh epoch is a new composition, so the revision advanced"
|
|
);
|
|
let restored = {
|
|
let state = f.harness.coordinator.published_state();
|
|
let state = state.lock().expect("not poisoned");
|
|
state.latest_snapshot().expect("the restored boundary").clone()
|
|
};
|
|
assert_eq!(restored.scope.step, 1, "the same committed boundary");
|
|
assert_eq!(restored.descriptor_revision, first + 1);
|
|
assert!(
|
|
restored.agents.iter().all(|a| a.selected_decision.is_none() && a.applied_controls.is_none()),
|
|
"an installed boundary carries no transition for any agent"
|
|
);
|
|
f.shutdown().await;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------
|
|
// Application-owned state and cues, bounded events, and the read-only repair service.
|
|
|
|
/// The application publishes its own state and cues, on its own addresses, under its own
|
|
/// schema. Nothing about them is framework-shaped.
|
|
async fn application_state_and_cues_are_the_applications_own(via: Via) {
|
|
let mut f = started(via).await;
|
|
let client = f
|
|
.harness
|
|
.application()
|
|
.await
|
|
.expect("an application client");
|
|
let mut channel = ApplicationChannel::new(client, "app.counter", 16);
|
|
channel
|
|
.declare()
|
|
.await
|
|
.expect("the application declares its own topics");
|
|
assert_eq!(channel.state_topic(), "app.counter.state");
|
|
assert_eq!(channel.cue_topic(), "app.counter.cues");
|
|
|
|
let watcher = f.harness.observer().await.expect("an observer client");
|
|
let mut states = watcher
|
|
.subscribe(channel.state_topic(), Delivery::LatestValue.subscription())
|
|
.await
|
|
.expect("a latest subscription");
|
|
let mut cues = watcher
|
|
.subscribe(
|
|
channel.cue_topic(),
|
|
Delivery::BoundedBatch { depth: 16 }.subscription(),
|
|
)
|
|
.await
|
|
.expect("a bounded subscription");
|
|
|
|
f.harness.coordinator.run(1).await.expect("a transition");
|
|
// The application's schema: its own namespace, not a framework field.
|
|
let schema = SchemaRef {
|
|
id: id("counter.show.v1"),
|
|
version: 1,
|
|
digest: digest_of_bytes(b"counter.show.v1"),
|
|
};
|
|
let state = typed(schema.clone(), json!({ "featured": "fly-a", "streak": 3 }))
|
|
.expect("an application value");
|
|
let outcome = channel.publish_state(1, &state).await;
|
|
assert!(outcome.is_accepted(), "{outcome:?}");
|
|
let cue = typed(schema, json!({ "line": "fly-a takes the lead" })).expect("a cue");
|
|
assert!(
|
|
channel
|
|
.publish_cue(1, &id("counter.headline"), &cue)
|
|
.await
|
|
.is_accepted()
|
|
);
|
|
|
|
let message = within("the application state", states.next())
|
|
.await
|
|
.expect("a state message");
|
|
assert_eq!(
|
|
message.payload().get("boundary").and_then(|v| v.as_str()),
|
|
Some("1")
|
|
);
|
|
let published = TypedValue::from_json(message.payload().get("state").expect("state"))
|
|
.expect("an application typed value");
|
|
assert_eq!(published.schema.id, id("counter.show.v1"));
|
|
drop(message);
|
|
let message = within("the cue", cues.next()).await.expect("a cue message");
|
|
assert_eq!(
|
|
message.payload().get("kind").and_then(|v| v.as_str()),
|
|
Some("counter.headline")
|
|
);
|
|
drop(message);
|
|
|
|
// Nothing the application published is on a session topic, and nothing on a session topic
|
|
// knows the application's schema.
|
|
let descriptor = f
|
|
.harness
|
|
.coordinator
|
|
.session_descriptor()
|
|
.expect("a descriptor");
|
|
assert_ne!(descriptor.task_schema.id, id("counter.show.v1"));
|
|
f.shutdown().await;
|
|
}
|
|
|
|
/// A refused event batch is held, counted and delivered later. Nothing is dropped quietly,
|
|
/// and what the bounded depth does push out travels as a count.
|
|
async fn a_refused_event_batch_is_held_and_counted_not_lost(via: Via) {
|
|
let mut f = started(via).await;
|
|
let events_topic = f.harness.coordinator.topics().events.clone();
|
|
let offender_client = f.harness.observer().await.expect("an observer client");
|
|
let mut offender = offender_client
|
|
.subscribe(
|
|
&events_topic,
|
|
flybus::SubscriptionConfig::bounded().queued(1).in_flight(1),
|
|
)
|
|
.await
|
|
.expect("a bounded subscription");
|
|
|
|
f.harness
|
|
.coordinator
|
|
.run(STEPS)
|
|
.await
|
|
.expect("an event observer never fails the epoch");
|
|
assert_eq!(f.harness.coordinator.stats().advances, STEPS);
|
|
let counters = f.harness.coordinator.ledger().counters(&events_topic);
|
|
assert!(counters.refused > 0, "the refusal is counted: {counters:?}");
|
|
assert!(f.harness.coordinator.ledger().events_held > 0);
|
|
assert!(
|
|
f.harness.coordinator.pending_events() > 0,
|
|
"the refused events are held in a bounded batch, not dropped"
|
|
);
|
|
|
|
// The offender starts consuming; the held batch goes out at the next boundary.
|
|
drop(within("an event delivery", offender.next()).await);
|
|
drop(offender.try_next());
|
|
let held = f.harness.coordinator.pending_events();
|
|
f.harness.coordinator.run(1).await.expect("a transition");
|
|
until("the held batch is published", || {
|
|
f.harness.coordinator.pending_events() < held
|
|
})
|
|
.await;
|
|
offender_client.close().await;
|
|
f.shutdown().await;
|
|
}
|
|
|
|
/// Two reads and nothing else. There is no method on this service that could move anything.
|
|
async fn the_query_service_answers_reads_and_nothing_else(via: Via) {
|
|
let mut f = started(via).await;
|
|
f.harness.coordinator.run(1).await.expect("a transition");
|
|
let client = f.harness.observer().await.expect("an observer client");
|
|
let service = query_service(&f.harness.config.session_id);
|
|
|
|
let request = SessionRpcRequest {
|
|
request_id: DomainRequestId::from_serial(1),
|
|
scope: None,
|
|
params: json!({}),
|
|
};
|
|
let mut pending = client
|
|
.call(&service, None, GET_SNAPSHOT, object(request.to_json()), &[])
|
|
.await
|
|
.expect("the service answers");
|
|
let result = pending.result().await.expect("a reply");
|
|
let outcome =
|
|
SessionRpcOutcome::from_json(&serde_json::Value::Object(result.outcome().clone()))
|
|
.expect("a domain outcome");
|
|
drop(result);
|
|
let snapshot = CommittedSnapshot::from_json(outcome_result(&outcome).expect("a result"))
|
|
.expect("a committed snapshot");
|
|
assert_eq!(snapshot.scope.step, 1);
|
|
assert!(snapshot.views.is_empty() || !snapshot.views.is_empty());
|
|
|
|
// A method it does not implement is a named refusal, not a default.
|
|
let request = SessionRpcRequest {
|
|
request_id: DomainRequestId::from_serial(2),
|
|
scope: None,
|
|
params: json!({}),
|
|
};
|
|
let mut pending = client
|
|
.call(
|
|
&service,
|
|
None,
|
|
"Session.Advance",
|
|
object(request.to_json()),
|
|
&[],
|
|
)
|
|
.await
|
|
.expect("the service answers");
|
|
let result = pending.result().await.expect("a reply");
|
|
let outcome =
|
|
SessionRpcOutcome::from_json(&serde_json::Value::Object(result.outcome().clone()))
|
|
.expect("a domain outcome");
|
|
drop(result);
|
|
let error = outcome_result(&outcome).expect_err("no such method");
|
|
assert_eq!(error.code, ErrorCode::Unsupported, "{error:?}");
|
|
assert_eq!(
|
|
f.harness.coordinator.stats().advances,
|
|
1,
|
|
"and nothing advanced"
|
|
);
|
|
client.close().await;
|
|
f.shutdown().await;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------
|
|
// Every execution mode
|
|
|
|
/// The publication boundary is inside the coordinator, so it crosses no process boundary: it
|
|
/// must therefore behave identically in all three modes, and this asserts that rather than
|
|
/// assuming it.
|
|
async fn the_publication_boundary_holds_in_every_execution_mode(mode: ExecutionMode) {
|
|
let mut f = started_in_mode(mode).await;
|
|
let mut consumer = f.harness.consumer().await.expect("a consumer attaches");
|
|
let revision = match within("the descriptor", consumer.take_descriptor()).await {
|
|
Some(ConsumerOutcome::Composition { revision, agents }) => {
|
|
assert_eq!(agents, vec![fly_a(), fly_b()]);
|
|
revision
|
|
}
|
|
other => panic!("expected a composition, got {other:?}"),
|
|
};
|
|
assert_eq!(revision, DESCRIPTOR_REVISION);
|
|
let descriptor = consumer.descriptor(revision).expect("held").clone();
|
|
for agent in &descriptor.agents {
|
|
// The graph identity is attested over the bus, so it crosses a process boundary like
|
|
// every other reply and is observable in every mode.
|
|
assert_eq!(
|
|
agent.index_digest,
|
|
fly_session::agent::synthetic_graph(&agent.agent_id, 0).index_digest
|
|
);
|
|
}
|
|
f.harness
|
|
.coordinator
|
|
.run(STEPS)
|
|
.await
|
|
.expect("the world runs");
|
|
let at = read_until(&mut consumer, STEPS).await;
|
|
assert_eq!(at, STEPS);
|
|
let view = consumer.last().expect("a snapshot");
|
|
assert_eq!(view.agents.len(), 2);
|
|
assert!(view.agent(&fly_a()).expect("fly-a").decision.is_some());
|
|
assert_eq!(
|
|
f.harness
|
|
.coordinator
|
|
.ledger()
|
|
.counters(&f.harness.coordinator.topics().snapshots)
|
|
.accepted,
|
|
STEPS + 1
|
|
);
|
|
f.shutdown().await;
|
|
}
|
|
|
|
/// A stalled observer costs only itself, in every mode.
|
|
async fn a_stalled_observer_never_moves_the_world_in_any_execution_mode(mode: ExecutionMode) {
|
|
let mut f = started_in_mode(mode).await;
|
|
let mut slow = f
|
|
.harness
|
|
.consumer()
|
|
.await
|
|
.expect("a slow consumer attaches");
|
|
until("the slow viewer has a delivery", || {
|
|
slow.try_hold_snapshot()
|
|
})
|
|
.await;
|
|
while slow.try_hold_snapshot() && slow.held() < 4 {}
|
|
let before = f.harness.coordinator.stats();
|
|
let started_at = std::time::Instant::now();
|
|
f.harness
|
|
.coordinator
|
|
.run(STEPS)
|
|
.await
|
|
.expect("the world carries on");
|
|
assert_eq!(
|
|
f.harness.coordinator.stats().advances - before.advances,
|
|
STEPS
|
|
);
|
|
assert!(!f.harness.coordinator.is_fenced());
|
|
assert_eq!(f.harness.coordinator.ledger().refusals(), 0);
|
|
assert!(started_at.elapsed() < Duration::from_secs(10));
|
|
f.shutdown().await;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------
|
|
// The policy and the batch, without a session
|
|
|
|
#[test]
|
|
fn a_topic_policy_declares_its_delivery_once() {
|
|
let latest = TopicPolicy::latest("session.demo.snapshots");
|
|
assert_eq!(latest.delivery, Delivery::LatestValue);
|
|
assert_eq!(latest.delivery.retained(), flybus::Retained::Latest);
|
|
assert_eq!(latest.delivery.subscription().mode, flybus::Mode::Latest);
|
|
let bounded = TopicPolicy::bounded("session.demo.events", 8);
|
|
assert_eq!(bounded.delivery, Delivery::BoundedBatch { depth: 8 });
|
|
// A bounded stream is never retained: it is "not a durable log", and a retained tail
|
|
// would be the beginning of one.
|
|
assert_eq!(bounded.delivery.retained(), flybus::Retained::None);
|
|
assert_eq!(bounded.delivery.subscription().max_queued, 8);
|
|
}
|
|
|
|
#[test]
|
|
fn a_full_event_batch_drops_the_oldest_by_an_explicit_count() {
|
|
let mut outbox = EventOutbox::new(EVENT_BATCH_DEPTH);
|
|
let event = |n: u64| TaskEvent {
|
|
id: id(&format!("ev-{n}")),
|
|
kind_id: id("arena.counter-delta"),
|
|
source_step: 1,
|
|
agent_id: None,
|
|
payload: typed(
|
|
SchemaRef {
|
|
id: id("t.v1"),
|
|
version: 1,
|
|
digest: digest_of_bytes(b"t.v1"),
|
|
},
|
|
json!({ "n": n }),
|
|
)
|
|
.expect("a typed value"),
|
|
};
|
|
for n in 0..EVENT_BATCH_DEPTH as u64 {
|
|
assert_eq!(
|
|
outbox.offer(1, &[event(n)]),
|
|
0,
|
|
"nothing is dropped inside the depth"
|
|
);
|
|
}
|
|
assert_eq!(outbox.len(), EVENT_BATCH_DEPTH);
|
|
assert_eq!(
|
|
outbox.offer(2, &[event(999)]),
|
|
1,
|
|
"the oldest is dropped, and counted"
|
|
);
|
|
assert_eq!(outbox.dropped_since_accepted(), 1);
|
|
assert_eq!(
|
|
outbox.len(),
|
|
EVENT_BATCH_DEPTH,
|
|
"and the batch stays bounded"
|
|
);
|
|
}
|
|
|
|
#[tokio::test]
|
|
async fn a_snapshot_that_disagrees_with_its_descriptor_is_refused() {
|
|
let f = started(Via::Memory).await;
|
|
let descriptor = f
|
|
.harness
|
|
.coordinator
|
|
.session_descriptor()
|
|
.expect("a descriptor")
|
|
.clone();
|
|
let snapshot = {
|
|
let state = f.harness.coordinator.published_state();
|
|
let state = state.lock().expect("not poisoned");
|
|
state.latest_snapshot().expect("boundary 0").clone()
|
|
};
|
|
let positions: BTreeMap<String, u64> = snapshot
|
|
.audio
|
|
.iter()
|
|
.map(|a| (a.stream_id.clone(), a.first_sample + a.sample_frames))
|
|
.collect();
|
|
let attachments: Vec<(String, ArtifactRef)> = snapshot
|
|
.views
|
|
.iter()
|
|
.map(|v| {
|
|
(
|
|
fly_session::media::view_attachment(&v.view_id),
|
|
v.pixels.clone(),
|
|
)
|
|
})
|
|
.chain(snapshot.audio.iter().map(|a| {
|
|
(
|
|
fly_session::media::audio_attachment(&a.stream_id),
|
|
a.samples.clone(),
|
|
)
|
|
}))
|
|
.collect();
|
|
|
|
let mut wrong = snapshot.clone();
|
|
wrong.descriptor_revision = DESCRIPTOR_REVISION + 1;
|
|
let error = check_publication(&descriptor, &wrong, &attachments, &positions)
|
|
.expect_err("another revision is a disagreement");
|
|
assert_eq!(error.code, ErrorCode::BufferInvalid, "{error:?}");
|
|
|
|
let mut renamed = snapshot.clone();
|
|
renamed.agents[0].agent_id = id("fly-z");
|
|
let error = check_publication(&descriptor, &renamed, &attachments, &positions)
|
|
.expect_err("an agent the descriptor does not declare");
|
|
assert!(error.message.contains("fly-z"), "{}", error.message);
|
|
|
|
// And a snapshot the session actually published passes the same check.
|
|
check_publication(&descriptor, &snapshot, &attachments, &positions)
|
|
.expect("what the session published agrees with the descriptor it named");
|
|
f.shutdown().await;
|
|
}
|