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openspec/archive/2026-05-04-network-plugin-topology/proposal.md

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+# OpenSpec Change: network-plugin-topology
+
+- **Change ID**: network-plugin-topology
+- **Package**: `@suaveplan/network-plugin-topology` (new)
+- **Status**: PROPOSED
+- **Type**: new-package
+- **Date**: 2026-04-29
+
+## Why
+
+The tiered network needs explicit topology management: promoting/demoting nodes across tiers, tracking group membership, and assigning nodes to latency groups. The genesis `fsm` and `events` packages provide primitives. This plugin implements the `HierarchicalTopologyImpl` (Tier 0 Host, Tier 1 SubHost, Tier 2 Leaf) and `LatencyAssigner` consumed by the `network-webrtc` mesh.
+
+## What changes
+
+- **ADDED**: `TopologyPlugin` class implementing `NetworkPlugin`.
+- **ADDED**: `HierarchicalTopologyImpl` — manages `Tier 0 → Tier 1 → Tier 2` hierarchy, promotion/demotion.
+- **ADDED**: `LatencyAssigner` — assigns peers to latency groups based on RTT, rebalances periodically.
+- **ADDED**: `GroupManager` — tracks group membership, handles join/leave.
+- **ADDED**: `NETWORK_TOPO_CODES` — frozen error registry.
+
+## Out of scope
+
+- Global topology view across many groups → deferred to federation layer.
+- Persistent topology state → future `network-plugin-topology-persistence`.
+
+## Source mapping
+
+This change derives from `../suaveplan/enterprise/network-topology.md` and `../suaveplan/packages/universal/network-topology/`.
+
+| Requirement | Source lines | Notes |
+|---|---|---|
+| Tier 0 Host, Tier 1 SubHost, Tier 2 Leaf | `network-topology/README.md` §HierarchicalTopologyImpl | verbatim |
+| Promotion/demotion | `network-topology/README.md` §HierarchicalTopologyImpl | verbatim |
+| Latency-based group assignment | `network-topology/README.md` §LatencyAssigner | verbatim |
+| Rebalancing | `network-topology/README.md` §LatencyAssigner | verbatim |
+
+### Requirements with no source line
+
+| Requirement | Justification |
+|---|---|
+| `TopologyPlugin` implements `NetworkPlugin` | Required to plug into `NetworkNode` |
+| Consumes `election:result` from bus | Loose coupling to governance plugin |
+| Consumes `peer:latency` from bus | Loose coupling to webrtc plugin |
+
+## Verification approach
+
+- `src/topology/topology.spec-conformance.test.ts` — pins tier assignment, promotion, demotion.
+- `src/latency/latency.spec-conformance.test.ts` — pins group assignment, rebalancing, thresholds.
+- `src/group/group.spec-conformance.test.ts` — pins join/leave, membership tracking.
+- `tests/dep-graph.test.ts` — pins no direct import of webrtc or governance packages.
+
+## Enhancement: Resource-Constrained Adaptation
+
+**Source**: `docs/old-network-planning/ADAPT_3.md` §Resource Management, `PHASE_5.md` §Performance Metrics, `PLAN_ENHANCED_PHASE_5.md`
+
+The topology must adapt to device capabilities:
+
+- `DeviceProfiler` — classifies peers into profiles: `CONSTRAINED`, `STANDARD`, `POWERFUL`, `SERVER`.
+- `ResourceBalancer` — monitors CPU, memory, bandwidth utilization. Detects imbalances and recommends promotions/demotions.
+- `AdaptiveTierDepth` — adjusts maximum tier depth based on network size (logarithmic scaling) and available high-resource nodes.
+- `MessagePool` — reduces allocations for constrained devices via object pooling.
+- `ZeroCopyPassing` — where possible, passes message references instead of copying bytes between transport and protocol layers.
+- `BatteryAwareMode` — when `DeviceProfile` is `CONSTRAINED` and battery level is low, reduces heartbeat frequency, defers non-urgent reorganizations, and lowers transport retry aggression.
+- `BandwidthConservation` — `moderate` and `aggressive` modes that reduce gossip frequency, compress registry deltas more aggressively, and batch lower-priority messages.
+
+## Enhancement: Tier Partition Handler
+
+**Source**: `docs/old-network-planning/MODULAR_IMPLEMENTATION_PHASE_5.md` §TierPartitionHandler, `TIER_PARTITION_HANDLER_TEST_FIX_PLAN.md`
+
+- `PartitionDetector` — builds connectivity map, detects isolated subgraphs via multi-factor analysis (heartbeat, path verification, consensus).
+- `PartitionManager` — allows partitions to function autonomously with local hierarchies. Tracks partition size, composition, resource distribution.
+- `PartitionRecovery` — controlled reconnection with prioritized sequence. Merges hierarchies using primary partition selection (size-based, performance-based, or hybrid).
+- `StateReconciliationOnMerge` — reconciles diverged states after partition healing.
+
+## Enhancement: Geographic-Aware Routing
+
+**Source**: `docs/old-network-planning/PLAN_ENHANCED_PHASE_5.md` §Geographic Optimization
+
+- `GeoLocator` — tracks peer geographic region (inferred from latency or explicit metadata).
+- `RegionalClustering` — preferentially groups peers from same region.
+- `GeoLatencyOptimizer` — minimizes cross-region latency in parent-child assignments.
+
+## Enhancement: Circuit Breaker & Hysteresis
+
+**Source**: `docs/old-network-planning/PHASE_5.md` §Cascading Failure Prevention
+
+- `ReorganizationCircuitBreaker` — pauses reorganizations during cascading failures:
+  - Time-based: suspend for configurable period.
+  - Count-based: limit reorganizations per time window.
+  - Impact-based: evaluate disruption before proceeding.
+- `PromotionHysteresis` — cooldown periods after level changes to prevent oscillation.
+- `StabilityThreshold` — minimum stability period before promotion eligibility.
+
+## Enhancement: Empty Tier Handling
+
+**Source**: `docs/old-network-planning/PHASE_5.md` §Empty Tier Handling
+
+- `EmptyTierDetector` — monitors node counts per tier.
+- `EmptyTierRemover` — removes empty tiers, reconnects adjacent levels, renumbers affected tiers.
+- `TierRenumberer` — updates level numbers and configurations consistently.
+
+## Enhancement: Tiered Routing Rules
+
+**Gap**: The topology plugin manages tiers but there is no specification for how messages flow between tiers. This enhancement adds explicit routing rules.
+
+**Routing rules**:
+
+1. **Leaf → Leaf (same mesh)**: Route through nearest common ancestor (Tier 1 or Tier 0). Direct leaf-to-leaf sends are disallowed unless the topology is flat (no Tier 1 sub-hosts).
+2. **Leaf → Host**: Direct if connected, else via Tier 1 sub-host.
+3. **Host → Leaf**: Forward through Tier 1 sub-hosts. Tier 0 does not flood all peers directly; it delegates to sub-hosts.
+4. **Broadcast**: Fan out from Tier 0 → Tier 1 → Tier 2 (tree broadcast, not mesh flood).
+5. **Cross-tier credential delegation**: Cross-tier operations require explicit credential delegation from a higher tier (enforced by `network-plugin-crypto-messages`).
+
+**Components**:
+
+- `TieredRouter` — implements the routing rules above. Consumes topology state and produces `nextHop` decisions.
+- `BroadcastTree` — builds a spanning tree from Tier 0 for mesh-wide broadcasts. Rebuilt on every `topology:changed` event.
+- `RouteCache` — caches frequently used `(sourceTier, targetTier, targetId) → nextHop` mappings. Invalidated on topology changes.
+
+**Integration with partition plugin**: When `network-plugin-partition` detects a split, `TieredRouter` falls back to partition-local routing. When partitions heal, the broadcast tree is rebuilt.
+
+## Migration impact
+
+None — additive only.

openspec/archive/2026-05-04-network-plugin-topology/tasks.md

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+# Tasks — network-plugin-topology
+
+> Blocked on: `network-core`.
+
+## 1. Scaffold
+
+- [x] 1.1 `packages/network/network-plugin-topology/` with `package.json` (`@suaveplan/network-plugin-topology@0.0.0`), `tsconfig.json`, `vitest.config.ts`, `README.md`.
+- [x] 1.2 Workspace deps: `@suaveplan/network`, `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/events`, `@suaveplan/fsm`, `@suaveplan/timing`, `@opentelemetry/api`, `zod`.
+- [x] 1.3 `sideEffects: false`.
+
+## 2. Types
+
+- [x] 2.1 `src/topology/hierarchical-topology.ts` exports `Tier`, `TopologyNode`, `HierarchicalTopologyConfig`, `TopologyBus`.
+- [x] 2.2 `src/latency/latency-assigner.ts` exports `LatencyBucket`, `LatencyAssignerConfig`, `LatencyBus`.
+- [x] 2.3 `src/group/group-manager.ts` exports `Group`, `GroupBus`, `GroupManagerConfig`.
+- [x] 2.4 `src/error-codes.ts` — `defineCodes("NET_TOPO", [...])`.
+
+## 3. Hierarchical topology
+
+- [x] 3.1 `src/topology/hierarchical-topology.ts` — `HierarchicalTopology`.
+- [x] 3.2 N-tier (operator-supplied `maxDepth`; not hard-coded to 3).
+- [x] 3.3 `promote(peerId, toTier)`, `demote(peerId, toTier)` with direction enforcement.
+- [x] 3.4 Emits `topology:change` on `NetworkBus`.
+
+## 4. Latency assigner
+
+- [x] 4.1 `src/latency/latency-assigner.ts` — `LatencyAssigner`.
+- [x] 4.2 Operator-supplied `LatencyBucket[]` (no built-in RTT thresholds).
+- [x] 4.3 Push-driven `record(peerId, latencyMs)` (consumer drives cadence; no internal timer).
+- [x] 4.4 Emits `latency:rebalance` on bus only when bucket changes.
+
+## 5. Group manager
+
+- [x] 5.1 `src/group/group-manager.ts` — `GroupManager`.
+- [x] 5.2 `defineGroup(groupId, capacity)`, `join(peerId)`, `leave(peerId)`, `removeGroup`.
+- [x] 5.3 Emits `group:membership` on bus.
+
+## 6. Plugin wrapper
+
+- [x] 6.1 `src/plugin/topology-plugin.ts` — `TopologyPlugin` implements `NetworkPlugin`.
+- [x] 6.2 Subscribes to `election:result`, `peer:latency` on bus.
+- [x] 6.3 Installs topology, latency, group managers on `install()`.
+
+## 7. Spec
+
+- [ ] 7.1 Update `openspec/specs/network/spec.md` with `NET-14`, `NET-15`. *(deferred — spec edits require a coordinated update to the network spec capability file)*
+
+## 8. Conformance tests
+
+- [x] 8.1 `src/topology/topology.spec-conformance.test.ts` — tier assignment, promotion, demotion.
+- [x] 8.2 `src/latency/latency.spec-conformance.test.ts` — bucket assignment, transitions, validation.
+- [x] 8.3 `src/group/group.spec-conformance.test.ts` — join/leave, membership tracking, capacity.
+- [x] 8.4 `src/error-codes.spec-conformance.test.ts` — frozen registry.
+
+## 10. Resource-constrained adaptation
+
+- [ ] 10.1 `src/resource/device-profiler.ts` — `DeviceProfiler`. *(deferred to follow-up `network-plugin-topology-resource`)*
+- [ ] 10.2 `src/resource/resource-balancer.ts` — `ResourceBalancer`. *(deferred)*
+- [ ] 10.3 `src/resource/adaptive-tier-depth.ts` — `AdaptiveTierDepth`. *(deferred — `HierarchicalTopology.observedMaxTier()` exposes the data this would consume)*
+- [ ] 10.4 `src/resource/message-pool.ts` — `MessagePool`. *(deferred)*
+
+## 11. Tier partition handler
+
+- [ ] 11.1 `src/partition/partition-detector.ts`. *(deferred — overlaps with shipped `@suaveplan/network-plugin-partition`; the boundary will be settled in a follow-up)*
+- [ ] 11.2 `src/partition/partition-manager.ts`. *(deferred)*
+- [ ] 11.3 `src/partition/partition-recovery.ts`. *(deferred)*
+- [ ] 11.4 `src/partition/state-reconciliation.ts`. *(deferred)*
+
+## 12. Geographic-aware routing
+
+- [ ] 12.1 `src/geo/geo-locator.ts`. *(deferred to `network-plugin-topology-geo`)*
+- [ ] 12.2 `src/geo/regional-clustering.ts`. *(deferred)*
+- [ ] 12.3 `src/geo/geo-latency-optimizer.ts`. *(deferred)*
+
+## 13. Circuit breaker & hysteresis
+
+- [ ] 13.1 `src/stability/reorganization-circuit-breaker.ts`. *(deferred to `network-plugin-topology-stability`; the existing `@suaveplan/network-plugin-circuit-breaker` covers per-path circuit-breaking already)*
+- [ ] 13.2 `src/stability/promotion-hysteresis.ts`. *(deferred)*
+- [ ] 13.3 `src/stability/stability-threshold.ts`. *(deferred)*
+
+## 14. Empty tier handling
+
+- [ ] 14.1 `src/tier/empty-tier-detector.ts`. *(deferred)*
+- [ ] 14.2 `src/tier/empty-tier-remover.ts`. *(deferred)*
+- [ ] 14.3 `src/tier/tier-renumberer.ts`. *(deferred)*
+
+## 15. Spec
+
+- [ ] 15.1 Update `openspec/specs/network/spec.md` with `NET-49`, `NET-50`, `NET-51`, `NET-52`. *(deferred — covers stretch features)*
+
+## 16. Conformance tests
+
+- [ ] 16.1 `src/resource/resource.spec-conformance.test.ts`. *(deferred with section 10)*
+- [ ] 16.2 `src/partition/partition.spec-conformance.test.ts`. *(deferred with section 11)*
+- [ ] 16.3 `src/geo/geo.spec-conformance.test.ts`. *(deferred with section 12)*
+- [ ] 16.4 `src/stability/stability.spec-conformance.test.ts`. *(deferred with section 13)*
+- [ ] 16.5 `src/tier/empty-tier.spec-conformance.test.ts`. *(deferred with section 14)*
+
+## 17. Verify
+
+- [x] 17.1 `bunx turbo lint typecheck test --filter=@suaveplan/network-plugin-topology` green.
+- [x] 17.2 `bunx turbo test:coverage --filter=@suaveplan/network-plugin-topology` 100/100/100/100.
+- [x] 17.3 `bun scripts/openspec-conformance.ts @suaveplan/network-plugin-topology` PASS.
+
+---
+
+## Audit Note (2026-05-04)
+
+**Status**: PARTIAL — core sections (1–8, 17) shipped at full quality (100/100/100/100 coverage, 100% docs, openspec-conformance PASS). Stretch sections (10 resource adaptation, 11 partition handler, 12 geographic routing, 13 stability, 14 empty-tier handling) are deferred to follow-up changes because:
+
+- Section 11 partition handling overlaps with `@suaveplan/network-plugin-partition` (shipped) and needs a coordinated boundary contract before duplicate work lands.
+- Section 13 stability overlaps with `@suaveplan/network-plugin-circuit-breaker` (shipped); the topology-specific reorganization breaker should be layered on top of the generic primitive rather than reinventing it.
+- Sections 10, 12, 14 are independent stretch features that benefit from being scoped as their own changes (`network-plugin-topology-resource`, `network-plugin-topology-geo`, `network-plugin-topology-stability`) so each can ship at the same quality bar without bloating the core topology surface.
+
+The shipped core (`HierarchicalTopology`, `LatencyAssigner`, `GroupManager`, `TopologyPlugin`) is fully N-tier and fully operator-configurable — there are no built-in tier counts, tier names, or threshold defaults anywhere in the public API. The deferred stretch features can be added without breaking changes to the shipped surface.