CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

What This Is

NestJS backend for the PalmOilAI system. Provides server-side YOLOv8 ONNX inference, SQLite history persistence, WebSocket gateways for real-time vision streaming and chat proxying, and a process surveillance monitor for n8n and Ollama.

Detection classes: Ripe, Unripe, Underripe, Overripe, Abnormal, Empty_Bunch (MPOB standard).

Commands

npm install
npm run start:dev               # Watch mode dev server (port 3000)
npm run start                   # Single-run dev server
npm run start:prod              # Production (from dist/)
npm run build                   # Compile → dist/
npm run lint                    # ESLint with auto-fix
npm run test                    # Jest unit tests
npm run test:watch              # Jest watch mode
npm run test:cov                # Coverage report
npm run test:e2e                # End-to-end tests
jest --testPathPattern=palm-oil # Run a single test file

Set PORT env var to override the default port 3000. Set N8N_WEBHOOK_URL in .env for chat proxy and agent readiness probing.

Architecture

Modules

PalmOilModule (src/palm-oil/) — Core feature module:

ScannerProvider — ONNX inference pipeline: sharp resizes to 640×640, strips alpha, transposes HWC→CHW, normalizes to [0.0, 1.0], feeds [1, 3, 640, 640] tensor to onnxruntime-node. Output is [1, N, 6] (x1, y1, x2, y2, confidence, class_index), filtered at 0.25 confidence by default.
PalmOilService — Orchestrates inference + SQLite persistence. analyzeImage() is the main entry point; it fully awaits the historyRepository.save() before returning (intentional blocking — guarantees DB write before socket emit).
VisionGateway — WebSocket gateway on /vision namespace. Handles vision:analyze (Base64 image → ONNX inference → vision:result) and chat:send (proxies to n8n webhook → chat:result). Receives raw, uncompressed Base64 strings only — no binary frames, no WebRTC.
HistoryEntity — TypeORM entity; fields: archive_id, filename, total_count, industrial_summary (JSON), detections (JSON), inference_ms, processing_ms, created_at.
mpob-standards.ts — Source of truth for class names, grade colors, and health alert flag list (Abnormal, Empty_Bunch).

SurveillanceModule (src/surveillance/) — Process monitoring module:

SurveillanceService — Boots on OnModuleInit. Discovers PIDs for n8n (Node.js process containing "n8n" in cmd, port 5678 must be accepting TCP connections) and Ollama (ollama_llama_server or ollama). Polls every 500ms via pidusage. Probes N8N_WEBHOOK_URL every 10s to determine agent readiness. PIDs are evicted if the process dies or n8n's port goes silent.
SurveillanceGateway — WebSocket gateway on /monitor namespace. Broadcasts monitor:data (CPU/memory metrics) on every 500ms tick and monitor:status (n8n webhook ready/not ready) when status changes. Pushes an immediate snapshot on client connect.

Database

SQLite file palm_history.db in the project root. Managed by TypeORM with synchronize: true (auto-creates tables — dev only). No external DB setup required.

Required File

best.onnx must be placed in the project root directory (not src/). This is the YOLOv8 ONNX model loaded by ScannerProvider at inference time.

WebSocket Event Contracts

Namespace	Client → Server	Server → Client
`/vision`	`vision:analyze` `{ frame: string, sourceLabel?: string }`	`vision:result`, `vision:error`
`/vision`	`chat:send` `{ message: string }`	`chat:result`, `chat:error`
`/monitor`	`monitor:subscribe`	`monitor:data` (MonitorPayload[]), `monitor:status`

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