Initial Commit
This commit is contained in:
@@ -0,0 +1,104 @@
|
||||
# OpenSpec Change: network-plugin-server-bridge
|
||||
|
||||
- **Change ID**: network-plugin-server-bridge
|
||||
- **Package**: `@suaveplan/network-plugin-server-bridge` (new)
|
||||
- **Status**: PROPOSED
|
||||
- **Type**: new-package
|
||||
- **Date**: 2026-04-29
|
||||
|
||||
## Why
|
||||
|
||||
The mesh is designed to operate autonomously when the central server is offline, but it must also maintain a bidirectional relationship with the server when online. The server provides authority (signed tokens), persistence, global coordination, and administrative control. This plugin runs on Tier 0 hosts and manages the WebSocket connection to the central server: detecting online/offline transitions, buffering logs during outages, replaying them on reconnection, receiving server commands, and reconciling divergent state.
|
||||
|
||||
## What changes
|
||||
|
||||
- **ADDED**: `ServerBridgePlugin` class implementing `NetworkPlugin`.
|
||||
- **ADDED**: `ServerGateway` — maintains a persistent WebSocket connection from the Tier 0 host to the central server. Heartbeat with configurable interval. Detects disconnect within 2× heartbeat interval.
|
||||
- **ADDED**: `OfflineModeCoordinator` — when server disconnects: switches mesh to autonomous mode, extends token grace periods, pauses server-dependent operations (new session creation), and broadcasts `server:offline` on the bus.
|
||||
- **ADDED**: `LogBuffer` — circular buffer of signed activity logs. When server is offline, logs are buffered locally on the Tier 0 host and replicated to sibling Tier 0 hosts (via `network-plugin-audit-mesh`). When server reconnects, buffered logs are replayed in sequence.
|
||||
- **ADDED**: `ReconciliationProtocol` — on server reconnection: server sends its last known `meshEpoch` and `sessionSequenceNumbers`. The mesh host sends all logs from those points forward. Server validates signatures, detects conflicts, and broadcasts reconciled state.
|
||||
- **ADDED**: `CommandDispatcher` — receives server commands: `kick-peer`, `merge-sessions`, `split-mesh`, `issue-token`, `broadcast-announcement`. Validates command signatures and dispatches to appropriate plugins via `NetworkBus`.
|
||||
- **ADDED**: `HeartbeatMultiplexer` — instead of every peer opening a WebSocket to the server, only Tier 0 hosts connect. Peer heartbeats are aggregated by the Tier 0 host and forwarded to the server in batches.
|
||||
- **ADDED**: `GracefulDegradationFsm` — `online → degrading → offline → recovering → online`. Uses `@suaveplan/fsm`.
|
||||
- **ADDED**: `NETWORK_SB_CODES` — frozen error registry.
|
||||
|
||||
## Offline → Online state machine
|
||||
|
||||
```text
|
||||
online
|
||||
│ server heartbeat timeout
|
||||
▼
|
||||
degrading ──(retry with backoff)──► online
|
||||
│ max retries exceeded
|
||||
▼
|
||||
offline ──(buffer logs, replicate to peers)──► [autonomous operation]
|
||||
│ server heartbeat detected
|
||||
▼
|
||||
recovering ──(replay logs, reconcile)──► online
|
||||
```
|
||||
|
||||
## Server command types
|
||||
|
||||
```typescript
|
||||
type ServerCommand =
|
||||
| { type: 'kick-peer'; targetPeerId: string; reason: string }
|
||||
| { type: 'merge-sessions'; fromSessionId: string; toSessionId: string }
|
||||
| { type: 'split-mesh'; meshId: string; newMeshId: string; peerIds: string[] }
|
||||
| { type: 'issue-token'; tokenType: 'session' | 'mesh'; token: SignedToken }
|
||||
| { type: 'broadcast'; message: string; scope: 'mesh' | 'all' }
|
||||
| { type: 'shutdown-mesh'; meshId: string; deadlineMs: number };
|
||||
```
|
||||
|
||||
All commands include a server Ed25519 signature. The plugin validates signatures before dispatch.
|
||||
|
||||
## Out of scope
|
||||
|
||||
- Server-side implementation → API gateway / game server packages.
|
||||
- Persistent queue for log replay → `network-plugin-audit-mesh` handles cross-host replication; this plugin handles server-facing buffering.
|
||||
- Multi-server federation (multiple central servers) → future scope.
|
||||
|
||||
## Source mapping
|
||||
|
||||
This is a **new design** — suaveplan has no equivalent server-mesh bridge.
|
||||
|
||||
### Requirements with no source line
|
||||
|
||||
| Requirement | Justification |
|
||||
|---|---|
|
||||
| Tier 0 host as server gateway | Prevents 1000s of peers from each opening a WebSocket to the server |
|
||||
| Offline mode with autonomous operation | Mesh must continue functioning during server outages |
|
||||
| Log buffering and replay | Server must reconstruct activity that occurred while offline |
|
||||
| Reconciliation protocol | Detect and resolve conflicts between server state and mesh state |
|
||||
| Server command dispatch | Admin must be able to control mesh remotely when online |
|
||||
| Command signature validation | Prevents rogue server or man-in-the-middle attacks |
|
||||
|
||||
## Verification approach
|
||||
|
||||
- `src/gateway/gateway.spec-conformance.test.ts` — pins connect, disconnect, heartbeat, detection.
|
||||
- `src/offline/offline.spec-conformance.test.ts` — pins autonomous mode, token grace extension.
|
||||
- `src/buffer/buffer.spec-conformance.test.ts` — pins log buffering, replay ordering, deduplication.
|
||||
- `src/reconciliation/reconciliation.spec-conformance.test.ts` — pins epoch sync, conflict detection.
|
||||
- `src/command/command.spec-conformance.test.ts` — pins command validation, dispatch, rejection.
|
||||
- `src/fsm/fsm.spec-conformance.test.ts` — pins state transitions, no invalid jumps.
|
||||
- `src/error-codes.spec-conformance.test.ts` — frozen registry.
|
||||
|
||||
## Enhancement: Configurable Hosting Model
|
||||
|
||||
**Source**: `docs/old-network-planning/SERVER_FAILOVER.md` §4 Hosting Configurations
|
||||
|
||||
The server bridge currently assumes server-to-client failover (model #3). It should support 4 hosting configurations:
|
||||
|
||||
- `PURE_CLIENT` — no central server. Mesh operates entirely peer-to-peer. Token creation requires Byzantine quorum.
|
||||
- `SERVER_BASED` — server is always top-tier host. Clients never promote. Fastest consistency but single point of failure.
|
||||
- `SERVER_TO_CLIENT_FAILOVER` — server starts as host, fails over to clients on disconnect. Current default behavior.
|
||||
- `CLIENT_WITH_SERVER_BACKUP` — clients host normally, server provides backup authority and reconciliation. Server can override client decisions when online.
|
||||
|
||||
`HostingModelConfig` — selectable at mesh creation time. Affects:
|
||||
|
||||
- Election behavior (whether clients can self-promote)
|
||||
- Token authority (whether server tokens are required or quorum suffices)
|
||||
- Reconciliation direction (server-wins vs client-wins on conflict)
|
||||
|
||||
## Migration impact
|
||||
|
||||
None — additive only.
|
||||
Reference in New Issue
Block a user