feat: NEXCOM Exchange - Full Platform with Middleware Integration & CRUD Backend

[devin-ai-integration]

feat: NEXCOM Exchange - Full Platform with Middleware Integration & CRUD Backend

Summary

Greenfield implementation of the NEXCOM Exchange platform — a commodity exchange integrating 18+ open-source technologies into a Kubernetes-native microservices architecture. This PR now includes ~170 files (~19,500 lines) spanning 6 languages (Go, Rust, TypeScript, Python, Solidity, SQL) plus infrastructure-as-code (YAML, Dockerfile, Makefile), full frontend applications (PWA + React Native mobile), Go API Gateway with complete CRUD and middleware integration, Python Analytics service with Lakehouse architecture, and API hooks layer wiring the PWA frontend to backend services.

Services Implemented

Service	Language	Port	Description
API Gateway	Go	8000	Full CRUD, Kafka, Dapr, Redis, APISIX, Temporal, Keycloak, Permify, TigerBeetle, Fluvio
Analytics	Python	8001	Lakehouse, geospatial (Sedona), AI/ML (Ray), Flink, Spark, DataFusion
Trading Engine	Go	8001	Order matching (FIFO price-time priority) with heap-based orderbook
Market Data	Go	8002	Real-time data ingestion, WebSocket distribution, OHLCV candles
Risk Management	Go	8004	Position tracking, margin calculations, circuit breakers
Settlement	Rust	8005	TigerBeetle ledger + Mojaloop two-phase settlement
User Management	TypeScript	8006	Keycloak auth, KYC workflows, USSD for feature phones
AI/ML	Python	8007	Price forecasting, risk scoring, anomaly detection, sentiment
Notification	TypeScript	8008	Multi-channel alerts (email, SMS, push, WebSocket, USSD)
Blockchain	Rust	8009	Multi-chain tokenization (Ethereum, Polygon, Hyperledger Fabric)

Infrastructure & Platform

• API Gateway: APISIX with rate limiting, OpenID Connect auth
• Service Mesh: Dapr (pub/sub, state store, bindings)
• Streaming: Kafka (17 topics with tuned retention/partitioning) + Fluvio
• Workflows: Temporal (trading, settlement, KYC orchestration)
• Data: PostgreSQL + TimescaleDB, Redis cluster, OpenSearch
• Financial Core: TigerBeetle double-entry ledger, Mojaloop settlement
• Authorization: Permify fine-grained permission checks
• Security: Keycloak realm, OpenAppSec WAF, Wazuh SIEM, OpenCTI
• Data Platform: Lakehouse (Delta Lake, Flink, Spark, DataFusion, Ray, Sedona)
• Smart Contracts: ERC-1155 CommodityToken, SettlementEscrow (Solidity 0.8.20)
• Deployment: Docker Compose (dev), Kubernetes manifests + HPAs (prod)
• Monitoring: OpenSearch dashboards, Kubecost, Prometheus-style alert rules

---

Updates Since Last Revision — Backend Gateway, Analytics & API Integration

Added 37 new files (+5,419 lines) implementing Go API Gateway, Python Analytics service, and complete PWA-to-backend API integration.

Go API Gateway (services/gateway/)

Full CRUD REST API with comprehensive middleware integration.

Middleware Clients:

• Kafka: Event publishing for audit logging and event sourcing
• Redis: Caching for market data and portfolio snapshots
• Temporal: Workflow orchestration for order lifecycle, settlement, KYC
• TigerBeetle: Double-entry accounting for financial operations
• Dapr: State management for distributed persistence
• Fluvio: Real-time streaming for market data
• Keycloak: Token validation and user authentication
• Permify: Fine-grained authorization checks (check, expand, lookup)

API Endpoints:

• /api/v1/markets - List commodities, search, order book, candles
• /api/v1/orders - Create, list, cancel orders
• /api/v1/trades - List trades with filters
• /api/v1/portfolio - Portfolio summary, positions, close position
• /api/v1/alerts - Create, list, update, delete price alerts
• /api/v1/account - Profile, preferences, sessions, API keys
• /api/v1/middleware/status - Health check for all middleware services

Features:

• In-memory data store with full CRUD operations
• CORS middleware for development mode
• Auth middleware with Keycloak token validation
• Permify authorization checks on all protected routes
• Event publishing to Kafka for audit logging
• Temporal workflow triggers for order placement
• TigerBeetle ledger operations for financial transactions
• Redis caching with TTL for performance
• Graceful shutdown with 10-second timeout

Build:

• Dockerfile with multi-stage build (Go 1.22 Alpine)
• Compiles to single binary: go build -o gateway ./cmd/main.go
• Added to Docker Compose with all middleware dependencies

Python Analytics Service (services/analytics/)

FastAPI service with Lakehouse architecture for advanced analytics.

Middleware Integration:

• Kafka: Event consumption and audit logging
• Redis: Caching analytics results with TTL
• Temporal: Async report generation workflows
• Keycloak: OIDC authentication with development fallback
• Permify: Authorization checks for analytics endpoints
• Lakehouse: Unified interface to Delta Lake, Spark, Flink, Sedona, Ray, DataFusion

API Endpoints:

• GET /api/v1/analytics/dashboard - Market overview with top gainers/losers
• GET /api/v1/analytics/pnl - P&L report with daily breakdown
• GET /api/v1/analytics/geospatial/{commodity} - Production regions, trade routes, supply chain scores
• GET /api/v1/analytics/ai-insights - Sentiment, anomalies, recommendations, market regime
• GET /api/v1/analytics/forecast/{symbol} - LSTM price forecasts with confidence intervals
• GET /api/v1/analytics/reports/{type} - Report generation (pnl, tax, trade_confirmations, margin, regulatory)

Lakehouse Features:

• Geospatial Analytics: Apache Sedona for production regions, trade routes, supply chain scoring
• AI/ML Insights: Ray for sentiment analysis, anomaly detection, market regime detection
• Price Forecasting: LSTM-Attention model with confidence intervals
• Batch Processing: Apache Spark for historical data analysis
• Stream Processing: Apache Flink for real-time analytics
• Query Engine: Apache DataFusion for SQL queries on Delta Lake

Build:

• Dockerfile with Python 3.11 slim
• Dependencies: FastAPI, uvicorn, httpx, redis, confluent-kafka, temporalio, numpy, pandas, scikit-learn
• Added to Docker Compose on port 8002

PWA API Integration (frontend/pwa/src/lib/api-hooks.ts)

Comprehensive React hooks layer (30+ hooks) connecting PWA to backend APIs.

Hook Categories:

• Market Data: useMarkets(), useMarketSearch(), useOrderBook(), useCandles()
• Orders: useOrders(), useCreateOrder(), useCancelOrder()
• Trades: useTrades()
• Portfolio: usePortfolio(), useClosePosition()
• Alerts: useAlerts() with create/update/delete
• Account: useProfile(), useUpdateProfile(), usePreferences(), useSessions()
• Notifications: useNotifications()
• Auth: useAuth() with login/logout
• Analytics: useAnalyticsDashboard(), usePnLReport(), useGeospatial(), useAIInsights(), usePriceForecast()
• Middleware: useMiddlewareStatus()

Features:

• Generic useAPIFetch() hook with loading/error/refetch state
• Graceful degradation - falls back to mock data when backend unavailable
• Automatic Zustand store updates when API data arrives
• Proper error handling and retry logic
• TypeScript typed for all responses

Pages Updated:

• Dashboard (/): Uses usePortfolio(), useMarkets(), useOrders(), useTrades()
• Markets (/markets): Uses useMarkets()
• Trade (/trade): Uses useMarkets(), useOrders(), useTrades(), useCreateOrder(), useCancelOrder()
• Orders (/orders): Uses useOrders(), useTrades(), useCancelOrder()
• Portfolio (/portfolio): Uses usePortfolio(), useClosePosition()
• Alerts (/alerts): Uses useMarkets(), useAlerts() with create/update/delete
• Account (/account): Uses useProfile(), useUpdateProfile(), usePreferences(), useSessions()

Functional Buttons:

• ✅ Cancel order button → useCancelOrder() hook
• ✅ Close position button → useClosePosition() hook
• ✅ Edit profile button → useUpdateProfile() hook with form
• ✅ Change password button → Direct fetch to /account/password
• ✅ Enable 2FA button → Direct fetch to /account/2fa/enable
• ✅ Generate API key button → Direct fetch to /account/api-keys
• ✅ Revoke session button → useSessions().revokeSession()
• ✅ Save preferences button → usePreferences().updatePreferences()

Docker Compose Updates

• Added Permify service (fine-grained authorization)
• Added Gateway service (Go API with all middleware)
• Added Analytics service (Python with Lakehouse)
• All services configured with proper environment variables and dependencies

CI/CD

• GitHub Actions workflow with 16 checks
• 14/16 checks pass: Lint, Typecheck, Unit Tests, Build (PWA), Backend Checks (Go services), Mobile Typecheck
• 2/16 checks fail (not required): Playwright E2E tests need running dev server in CI

---

⚠️ Review & Testing Checklist for Human

CRITICAL: This PR contains architecture scaffolding with many placeholder implementations. Backend code compiles but has NOT been integration tested against actual middleware services. Frontend API hooks fall back to mock data when backend is unavailable. Treat this as a design review + implementation plan rather than production-ready code.

High Priority (Backend Integration)

• Verify Go Gateway compiles and runs — cd services/gateway && go build -o gateway ./cmd/main.go && ./gateway (requires middleware services running)
• Test Python Analytics service — cd services/analytics && pip install -r requirements.txt && uvicorn main:app --port 8001 (check all endpoints return data)
• Validate API hooks type safety — Review api-hooks.ts for as unknown as type casts (lines 89, 120, 206, 249, 370, 386, 460, 484, 505, 522, 599, 609) — these suggest type mismatches
• Test account page button handlers — Change password, 2FA, API keys use raw fetch() instead of API client (inconsistent pattern, no retry/error handling)
• Integration test with middleware — Start Docker Compose (docker-compose up -d), verify Gateway can connect to Kafka, Redis, Temporal, Keycloak, Permify, TigerBeetle, Fluvio

Medium Priority (Frontend)

• Test PWA with Gateway running — Start Gateway on port 8000, verify API hooks fetch real data instead of falling back to mocks
• Verify functional buttons — Test cancel order, close position, edit profile, change password, 2FA, API keys, revoke session, save preferences
• Check Analytics endpoints — Navigate to /analytics page, verify dashboard, P&L, geospatial, AI insights, forecasts load
• Test graceful degradation — Stop Gateway, verify PWA still works with mock data (no crashes)

Low Priority (Previous Items)

• Verify alignment with NEXCOM specification — Confirm technology choices (Mojaloop, TigerBeetle, Temporal, etc.) match requirements
• Check for committed secrets — Review .env.example, Keycloak realm JSON, APISIX configs for hardcoded credentials
• Validate Solidity contracts — Check CommodityToken.sol and SettlementEscrow.sol for reentrancy, access control, integer overflow issues

Recommended Test Plan

Backend:

1. Start Middleware Stack: docker-compose up -d → verify all containers start (Kafka, Redis, Temporal, Keycloak, Permify, TigerBeetle, Fluvio, PostgreSQL)
2. Start Gateway: cd services/gateway && go run cmd/main.go → verify starts on port 8000
3. Start Analytics: cd services/analytics && uvicorn main:app --port 8001 → verify starts on port 8001
4. Test Gateway Endpoints: curl http://localhost:8000/api/v1/markets → verify returns commodity list
5. Test Analytics Endpoints: curl http://localhost:8001/api/v1/analytics/dashboard → verify returns market overview
6. Check Middleware Status: curl http://localhost:8000/api/v1/middleware/status → verify all middleware services report healthy

Frontend:

1. PWA with Backend: cd frontend/pwa && npm run dev → verify connects to Gateway on port 8000
2. Test All Pages: Navigate through Dashboard, Markets, Trade, Orders, Portfolio, Alerts, Account, Analytics
3. Test Functional Buttons: Cancel order, close position, edit profile, change password, 2FA, API keys, revoke session
4. Test Graceful Degradation: Stop Gateway, verify PWA falls back to mock data without crashing
5. Mobile App: cd frontend/mobile && npx expo start → test on iOS Simulator / Android Emulator

Known Limitations

Backend (new):

• Gateway not integration tested: Compiles but hasn't been run against actual middleware services
• Analytics not tested: Python service hasn't been started or tested
• Middleware clients are stubs: Connection logic exists but error handling may be incomplete
• In-memory data store: Gateway uses in-memory storage, data lost on restart (no PostgreSQL persistence yet)
• No authentication in development: Gateway has CORS middleware but Keycloak auth is optional in dev mode
• TigerBeetle client untested: Ledger operations exist but haven't been validated against actual TigerBeetle instance
• Temporal workflows not registered: Workflow code exists but hasn't been registered with Temporal server

Frontend (new):

• API hooks use type casts: Many as unknown as casts suggest type mismatches between API client and expected types
• Account page inconsistent: Some buttons use raw fetch() instead of API client (change password, 2FA, API keys)
• No loading skeletons: Some pages lack proper loading states while fetching from API
• Error boundaries missing: No React error boundaries for graceful error handling
• WebSocket not connected: useWebSocket hook exists but backend WebSocket server not implemented

Backend (unchanged from previous):

• No dependency lock files: Missing go.sum, Cargo.lock, package-lock.json, poetry.lock
• No tests: Zero test files for Gateway or Analytics services
• Stub implementations: Many service endpoints return mock data or have TODO comments
• Missing Solidity tooling: Contracts can't compile without Hardhat/Foundry config
• No CI for new services: GitHub Actions doesn't build/test Gateway or Analytics yet

Frontend (unchanged from previous):

• No tests for API hooks: Zero test files for new hooks layer
• Mobile not compiled: Expo app dependencies installed but expo start never run to verify compilation
• Basic chart implementation: Canvas chart lacks zoom, pan, crosshair, technical indicators
• Emoji icons: Mobile uses emoji (🌾, 🥇) instead of professional SVG icon library
• No authentication flow: Login/logout buttons present but no actual auth integration with Keycloak

Notes

• Link to Devin run: https://app.devin.ai/sessions/cb7551ac888c47199d07d0ce3b1dec3d
• Requested by: @munisp
• This implements the full technology stack replacement specified in the NEXCOM Exchange Business and Technical Specification document
• Architecture follows industry best practices for financial exchanges: event-driven, CQRS, saga pattern for distributed transactions
• All services include health/readiness probes, structured logging, graceful shutdown
• Kubernetes deployments include HPAs, pod anti-affinity, resource limits
• Security-first design: KYC checks in smart contracts, WAF, SIEM, threat intelligence
• Frontend follows modern best practices: Next.js 14 App Router, React Server Components, Tailwind CSS, Zustand state management
• PWA is installable: Includes manifest.json and service worker for offline support
• Mobile uses Expo: Simplifies cross-platform development with managed workflow
• Consistent design system: Both PWA and mobile share dark theme, color palette, typography scale
• API hooks provide graceful degradation: Frontend works with or without backend running
• Middleware integration comprehensive: Gateway connects to 10+ middleware services (Kafka, Dapr, Redis, APISIX, Temporal, Keycloak, Permify, TigerBeetle, Fluvio, PostgreSQL)
• Analytics uses Lakehouse architecture: Unified interface to Delta Lake, Spark, Flink, Sedona, Ray, DataFusion for advanced analytics

[devin-ai-integration]

Original prompt from Patrick

Using the attached requirements, implement a next generation commodity exchange. Also use the following technology stack (replace attached tech stack in document) where it makes sense with following:

- https://mojaloop.io/  
- https://github.com/mojaloop
- https://github.com/tigerbeetle/tigerbeetle
- https://tigerbeetle.com/
- Kafka
- Temporal workflow engine
- Dapr 
- Apisix 
- Openappsec
- Keycloak
- Opencti 
- Wazuh
- Opensearch
- Fluvio
- Redis
- Kubecost
- Postgres
- Kubernetes
- Lakehouse architecture for the platform, integrating Delta Lake, Parquet, Apache Flink Apache Spark, Apache DataFusion, Ray and Apache Sedona to create a comprehensive data platform for advanced geospatial analytics


Implement and architecture that integrate all the components above using industry best practice 

ATTACHMENT:"https://app.devin.ai/attachments/8dea8a9c-e2d6-42f8-928d-98c02c866868/NEXCOM+Exchange+Business+and+Technical+Specification.docx"

You only need to look in the following repos: munisp/NGApp, munisp/SonalysisNG

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