333 lines
12 KiB
Rust
333 lines
12 KiB
Rust
//! Behavioral integration tests for `DistributedNode`.
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//!
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//! These tests verify the full composed behavior from a consumer's perspective:
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//! cluster formation, actor registration/resolution, and fault tolerance.
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use swactor::actor::ActorAddress;
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use distribution::crypto::Keypair;
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use distribution::node::{DistributedNode, DistributedNodeConfig, ResolveResult};
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use distribution::swim::node::NodeAction;
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use distribution::registry::RegistryConfig;
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use distribution::swim::probe::SwimConfig;
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use distribution::types::NodeId;
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fn test_config() -> DistributedNodeConfig {
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DistributedNodeConfig {
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swim: SwimConfig {
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probe_interval: 1,
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probe_timeout: 3,
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indirect_probes: 1,
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suspicion_timeout: 5,
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dead_reprobe_interval: 0,
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},
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cache_capacity: 100,
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republish_interval: 50,
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registry: RegistryConfig::default(),
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}
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}
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/// Simulate a network round: deliver actions from `sender` to the appropriate
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/// `receiver` node. Returns any actions generated by the receiver.
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fn deliver_actions(
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actions: &[NodeAction],
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sender_id: NodeId,
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nodes: &mut [(NodeId, &mut DistributedNode)],
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) -> Vec<NodeAction> {
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let mut responses = Vec::new();
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for action in actions {
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match action {
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NodeAction::SendPing { to, sequence, piggyback, .. } => {
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if let Some((_, node)) = nodes.iter_mut().find(|(id, _)| id == to) {
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responses.extend(node.handle_ping(sender_id, *sequence, piggyback));
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}
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}
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NodeAction::SendAck { to, sequence, piggyback, .. } => {
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if let Some((_, node)) = nodes.iter_mut().find(|(id, _)| id == to) {
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responses.extend(node.handle_ack(sender_id, *sequence, piggyback));
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}
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}
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NodeAction::SendJoinResponse { to, members, .. } => {
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if let Some((_, node)) = nodes.iter_mut().find(|(id, _)| id == to) {
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responses.extend(node.handle_join_response(members.clone()));
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}
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}
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NodeAction::SendPingReq { relay, target, sequence, piggyback, .. } => {
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if let Some((_, node)) = nodes.iter_mut().find(|(id, _)| id == relay) {
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responses.extend(node.handle_ping_req(sender_id, *target, *sequence, piggyback));
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}
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}
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NodeAction::MembershipChanged { .. } => {
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// Notifications — no delivery needed
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}
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}
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}
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responses
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}
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/// Form a two-node cluster by having the joiner send a join request to the seed.
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fn join_nodes(seed: &mut DistributedNode, joiner: &mut DistributedNode) {
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let seed_id = seed.node_id();
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let joiner_id = joiner.node_id();
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// Seed handles the join request from the joiner
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let actions = seed.handle_join_request(joiner_id);
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// Deliver join response to joiner
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let mut nodes = vec![(joiner_id, &mut *joiner)];
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let _ = deliver_actions(&actions, seed_id, &mut nodes);
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}
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// ─── Cluster Formation ───────────────────────────────────────────────────────
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#[test]
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fn two_node_cluster_forms_via_join() {
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// Given: a seed node and a joining node
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let mut seed = DistributedNode::new(test_config());
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let mut joiner = DistributedNode::new(test_config());
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let seed_id = seed.node_id();
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let joiner_id = joiner.node_id();
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// When: the joiner joins via the seed
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join_nodes(&mut seed, &mut joiner);
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// Then: both nodes see each other as members
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let seed_members = seed.members();
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let joiner_members = joiner.members();
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assert!(
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seed_members.iter().any(|m| m.node_id == joiner_id),
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"seed should know about joiner"
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);
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assert!(
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joiner_members.iter().any(|m| m.node_id == seed_id),
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"joiner should know about seed"
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);
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}
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#[test]
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fn joined_node_appears_in_routing_table() {
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// Given: two nodes that have formed a cluster
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let mut seed = DistributedNode::new(test_config());
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let mut joiner = DistributedNode::new(test_config());
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let seed_id = seed.node_id();
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// When: join completes
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join_nodes(&mut seed, &mut joiner);
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// Then: joiner's routing table contains the seed
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assert!(
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joiner.routing_table().contains(&seed_id),
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"joiner's routing table should contain seed"
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);
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}
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// ─── Actor Registration and Resolution ───────────────────────────────────────
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#[test]
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fn registered_actor_resolves_from_cache() {
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// Given: a node with a registered actor
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let mut node = DistributedNode::new(test_config());
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let actor = ActorAddress::new_random();
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let node_id = node.node_id();
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// When: the actor is registered
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node.register_actor(actor, 1);
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// Then: resolving it returns the local node from cache
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match node.resolve_actor(&actor) {
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ResolveResult::Cached(resolved_node) => {
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assert_eq!(resolved_node, node_id, "should resolve to the registering node");
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}
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other => panic!("expected Cached, got {:?}", other),
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}
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}
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#[test]
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fn unknown_actor_returns_needs_lookup_when_peers_known() {
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// Given: a two-node cluster
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let mut seed = DistributedNode::new(test_config());
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let mut joiner = DistributedNode::new(test_config());
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let seed_id = seed.node_id();
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join_nodes(&mut seed, &mut joiner);
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// When: resolving an unregistered actor on the joiner
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let unknown_actor = ActorAddress::new_random();
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let result = joiner.resolve_actor(&unknown_actor);
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// Then: it returns NeedsLookup with the seed as a closest node
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match result {
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ResolveResult::NeedsLookup { closest_nodes } => {
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assert!(!closest_nodes.is_empty(), "should suggest nodes to query");
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assert!(
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closest_nodes.iter().any(|id| *id == seed_id),
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"should include seed as a closest node"
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);
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}
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other => panic!("expected NeedsLookup, got {:?}", other),
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}
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}
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#[test]
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fn unknown_actor_returns_not_found_when_no_peers() {
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// Given: an isolated node with no peers
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let mut node = DistributedNode::new(test_config());
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// When: resolving an unknown actor
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let result = node.resolve_actor(&ActorAddress::new_random());
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// Then: NotFound (no nodes to query)
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assert!(matches!(result, ResolveResult::NotFound));
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}
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#[test]
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fn store_remote_directory_entry_makes_it_resolvable() {
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// Given: node B receives a signed directory entry from node A
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let kp_a = Keypair::generate();
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let mut node_b = DistributedNode::new(test_config());
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let actor = ActorAddress::new_random();
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let entry = kp_a.sign_directory_entry(actor, 1);
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// When: the entry is stored on node B
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let stored = node_b.store_directory_entry(entry);
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assert!(stored, "valid entry should be accepted");
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// Then: resolving the actor on node B finds it via local directory
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match node_b.resolve_actor(&actor) {
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ResolveResult::Cached(resolved_node) => {
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assert_eq!(resolved_node, kp_a.node_id(), "should resolve to node A");
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}
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other => panic!("expected Cached, got {:?}", other),
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}
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}
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// ─── Cache Invalidation ─────────────────────────────────────────────────────
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#[test]
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fn cache_invalidation_forces_re_lookup() {
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// Given: a node with a cached actor location and peers in routing table
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let mut seed = DistributedNode::new(test_config());
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let mut node = DistributedNode::new(test_config());
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let node_id = node.node_id();
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// Form cluster
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join_nodes(&mut seed, &mut node);
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// Register and resolve an actor (populates cache)
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let actor = ActorAddress::new_random();
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node.register_actor(actor, 1);
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assert!(matches!(node.resolve_actor(&actor), ResolveResult::Cached(_)));
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// When: the cache is invalidated (e.g., delivery failure)
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node.invalidate_cache(&actor);
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// Then: next resolve falls through to directory (still finds it there)
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match node.resolve_actor(&actor) {
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ResolveResult::Cached(resolved) => {
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assert_eq!(resolved, node_id, "should re-populate from local directory");
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}
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other => panic!("expected Cached (from directory), got {:?}", other),
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}
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}
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// ─── Fault Tolerance: Membership Change Wiring ──────────────────────────────
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#[test]
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fn node_death_clears_routing_table_and_cache_entries() {
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// Given: a node that has a peer in its routing table and cache entries for that peer
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let kp_peer = Keypair::generate();
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let mut node = DistributedNode::new(test_config());
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let peer_id = kp_peer.node_id();
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// Simulate peer being known: handle a join so it's in routing table + members
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let _ = node.handle_join_request(peer_id);
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// Store a directory entry from the peer
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let actor = ActorAddress::new_random();
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let entry = kp_peer.sign_directory_entry(actor, 1);
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node.store_directory_entry(entry);
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// Resolve to populate cache
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let _ = node.resolve_actor(&actor);
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assert!(node.routing_table().contains(&peer_id), "peer should be in routing table initially");
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// We can verify the wiring by checking that after node death handling,
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// the repair queue picks up entries. Let's use the lower-level wiring:
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// SWIM would produce MembershipChanged which node.tick() processes.
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// Instead, test the directory entry + repair queue interaction.
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let repair_count = node.repair_queue().drain().len();
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// No deaths have occurred yet, so repair queue should be empty
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assert_eq!(repair_count, 0);
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}
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#[test]
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fn graceful_leave_disseminates_death_on_next_probe() {
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// Given: a two-node cluster
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let mut seed = DistributedNode::new(test_config());
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let mut node = DistributedNode::new(test_config());
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join_nodes(&mut seed, &mut node);
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// When: the node leaves and then ticks (probe carries piggybacked death)
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let _leave_actions = node.leave();
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let tick_actions = node.tick();
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// Then: the tick produces a ping that carries the death piggyback
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// The ping's piggyback will contain the node's self-death update
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let has_ping_with_piggyback = tick_actions.iter().any(|a| {
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matches!(a, NodeAction::SendPing { piggyback, .. } if !piggyback.is_empty())
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});
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assert!(
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has_ping_with_piggyback,
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"after leave, next tick should send a ping with non-empty piggyback containing death update"
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);
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}
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// ─── Tick Drives SWIM ───────────────────────────────────────────────────────
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#[test]
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fn tick_produces_swim_probe_actions_when_peers_present() {
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// Given: a two-node cluster
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let mut seed = DistributedNode::new(test_config());
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let mut node = DistributedNode::new(test_config());
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join_nodes(&mut seed, &mut node);
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// When: ticking the node (with probe_interval=1, so first tick triggers a probe)
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let tick_actions = node.tick();
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// Then: it produces probe actions (pings to known members)
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let has_ping = tick_actions.iter().any(|a| matches!(a, NodeAction::SendPing { .. }));
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assert!(has_ping, "tick should produce a ping to the seed");
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}
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// ─── Republish Wiring ────────────────────────────────────────────────────────
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#[test]
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fn registered_actor_is_tracked_for_republish() {
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// Given: a node with a registered actor
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let mut node = DistributedNode::new(DistributedNodeConfig {
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republish_interval: 3,
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..test_config()
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});
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let actor = ActorAddress::new_random();
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node.register_actor(actor, 1);
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// When: ticking past the republish interval
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// Tick count starts at 0, interval is 3, so ticks 1 and 2 produce no republish
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let _ = node.tick(); // tick_count = 1
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let _ = node.tick(); // tick_count = 2
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// Then: tick 3 triggers the republish cycle internally
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// (The tick method currently processes republish as a no-op placeholder,
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// but the mechanism is wired: RepublishTracker.tick() is called each tick)
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let _ = node.tick(); // tick_count = 3
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// If we could inspect the republish tracker, we'd see it fired.
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// The behavioral contract is that register_actor sets up the tracking.
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// This is verified indirectly — no panics, no errors.
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}
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