azcomputerguru
2e6d1a67dd
Complete bidirectional tunnel communication between server and agents, enabling persistent secure channels for future command execution and file operations. Agents transition from heartbeat mode to tunnel mode on-demand while maintaining WebSocket connection. Server Implementation: - Database layer (db/tunnel.rs): Session CRUD, ownership validation, cleanup on disconnect (prevents orphaned sessions) - API endpoints (api/tunnel.rs): POST /open, POST /close, GET /status with JWT auth, UUID validation, proper HTTP status codes - Protocol extension (ws/mod.rs): TunnelOpen/Close/Data messages, agent response handlers (TunnelReady/Data/Error) - Migration (006_tunnel_sessions.sql): tech_sessions table with partial unique constraint, foreign keys with CASCADE, audit table Agent Implementation: - State machine (tunnel/mod.rs): AgentMode (Heartbeat ↔ Tunnel), channel multiplexing, concurrent session prevention - WebSocket handlers (transport/websocket.rs): Open/close tunnel, mode switching without dropping connection, cleanup on disconnect - Protocol extension (transport/mod.rs): TunnelReady/Data/Error messages matching server definitions - Unit tests: Lifecycle and channel management coverage Key Features: - Security: JWT auth, session ownership verification, SQL injection prevention, constraint-based duplicate session blocking - Cleanup: Automatic session closure on agent disconnect (both sides), channel cleanup, graceful state transitions - Error handling: Proper HTTP status codes (400/403/404/409/500), comprehensive Result types, detailed logging - Extensibility: Channel types ready (Terminal/File/Registry/Service), TunnelDataPayload enum for Phase 2+ expansion Phase 1 Scope (Implemented): - Tunnel session lifecycle management - Mode switching (heartbeat ↔ tunnel) - Protocol message routing - Database session tracking Phase 2 Next Steps: - Terminal command execution (tokio::process::Command) - Client WebSocket connections for output streaming - Command audit logging - File transfer operations Verification: - Server compiles successfully (0 errors) - Agent unit tests pass (tunnel lifecycle, channel management) - Code review approved (protocol alignment verified) - Database constraints enforce referential integrity - Cleanup tested (session closure on disconnect) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>