Wires the Phase 6.3 Stream B pure-logic pieces (ServiceLevelCalculator,
RecoveryStateManager, ApplyLeaseRegistry) + Stream A topology loader
(RedundancyCoordinator) into one orchestrator the runtime + OPC UA node
surface consume. The actual OPC UA variable-node plumbing (mapping
ServiceLevel Byte + ServerUriArray String[] onto the Opc.Ua.Server stack)
is narrower follow-up on top of this — the publisher emits change events
the OPC UA layer subscribes to.
Server.Redundancy additions:
- PeerReachability record + PeerReachabilityTracker — thread-safe
per-peer-NodeId holder of the latest (HttpHealthy, UaHealthy) tuple. Probe
loops (Stream B.1/B.2 runtime follow-up) write via Update; the publisher
reads via Get. PeerReachability.FullyHealthy / Unknown sentinels for the
two most-common states.
- RedundancyStatePublisher — pure orchestrator, no background timer, no OPC
UA stack dep. ComputeAndPublish reads the 6 inputs + calls the calculator:
* role (from coordinator.Current.SelfRole)
* selfHealthy (caller-supplied Func<bool>)
* peerHttpHealthy + peerUaHealthy (aggregate across all peers in
coordinator.Current.Peers)
* applyInProgress (ApplyLeaseRegistry.IsApplyInProgress)
* recoveryDwellMet (RecoveryStateManager.IsDwellMet)
* topologyValid (coordinator.IsTopologyValid)
* operatorMaintenance (caller-supplied Func<bool>)
Before-coordinator-init returns NoData=1 so clients never see an
authoritative value from an un-bootstrapped server.
OnStateChanged event fires edge-triggered when the byte changes;
OnServerUriArrayChanged fires edge-triggered when the topology's self-first
peer-sorted URI array content changes.
- ServiceLevelSnapshot record — per-tick output with Value + Band +
Topology. The OPC UA layer's ServiceLevel Byte node subscribes to
OnStateChanged; the ServerUriArray node subscribes to OnServerUriArrayChanged.
Tests (8 new RedundancyStatePublisherTests, all pass):
- Before-init returns NoData (Value=1, Band=NoData).
- Authoritative-Primary when healthy + peer fully reachable.
- Isolated-Primary (230) retains authority when peer unreachable — matches
decision #154 non-promotion semantics.
- Mid-apply band dominates: open lease → Value=200 even with peer healthy.
- Self-unhealthy → NoData regardless of other inputs.
- OnStateChanged fires only on value transitions (edge-triggered).
- OnServerUriArrayChanged fires once per topology content change; repeat
ticks with same topology don't re-emit.
- Standalone cluster treats healthy as AuthoritativePrimary=255.
Microsoft.EntityFrameworkCore.InMemory 10.0.0 added to Server.Tests for the
coordinator-backed publisher tests.
Full solution dotnet test: 1186 passing (was 1178, +8). Pre-existing
Client.CLI Subscribe flake unchanged.
Closes the core of release blocker #3 — the pure-logic + orchestration
layer now exists + is unit-tested. Remaining Stream C surfaces: OPC UA
ServiceLevel Byte variable wiring (binds to OnStateChanged), ServerUriArray
String[] wiring (binds to OnServerUriArrayChanged), RedundancySupport
static from RedundancyMode. Those touch the OPC UA stack directly + land
as Stream C.2 follow-up.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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