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Component Spec: nats-broker

Responsibilities​

  • Provide broker-based pub/sub for backend services.
  • Provide websocket-compatible endpoint for browser streaming clients.
  • Support wildcard subscriptions for account-scoped and pricing subjects.

Covered Flows​

  • F2 trade submission to processing event chain (with execution price enrichment).
  • F4 real-time account updates + pricing stream to UI.
  • STARTUP runtime readiness dependency for event-producing services.

Requirement Coverage​

  • FR-1002, FR-1005, FR-1006, FR-1009
  • NFR-1002, NFR-1003, NFR-1005

Interfaces​

  • NATS client: 4222
  • Monitoring: 8222 (optional debug)
  • Browser websocket (proxied): /nats-ws

Verification​

  • scripts/test-state-008-pricing-awareness-market-data.sh (to be implemented)