Implement live gossip federation server (5 phases)
Phase 1: RFC 6962 consistency proofs in merkle.py
- Implemented _build_consistency_proof() with recursive subtree
decomposition algorithm following RFC 6962 Section 2.1.2
- Added _subproof() recursive helper and _compute_root_of()
- Added standalone verify_consistency_proof() function
Phase 2: Federation API endpoints on FastAPI server
- GET /federation/status — merkle root + log size for gossip probes
- GET /federation/records?start=N&count=M — record fetch (cap 100)
- GET /federation/consistency-proof?old_size=N — Merkle proof
- POST /federation/records — accept records with trust filtering
and SHA-256 deduplication
- Cached storage singleton for concurrent safety
- Added FEDERATION_DIR to paths.py
Phase 3: HttpTransport implementation
- Replaced stub with real aiohttp client (lazy import for optional dep)
- Reusable ClientSession with configurable timeout
- All 4 PeerTransport methods: get_status, get_records,
get_consistency_proof, push_records
- FederationError wrapping for all network failures
- Added record_filter callback to GossipNode for trust-store filtering
Phase 4: Peer persistence (SQLite)
- New peer_store.py: SQLite-backed peer database + sync history
- Tables: peers (url, fingerprint, health, last_seen) and
sync_history (timestamp, records_received, success/error)
- PeerStore follows dropbox.py SQLite pattern
Phase 5: CLI commands + Web UI dashboard
- CLI: federation status, peer-add, peer-remove, peer-list,
sync-now (asyncio), history
- Flask blueprint at /federation/ with peer table, sync history,
add/remove peer forms, local node info cards
- CSRF tokens on all forms
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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