Initial setup, everything broken

inventory-server/ecosystem.config.js

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+module.exports = {
+  apps: [{
+    name: 'inventory-server',
+    script: 'src/server.js',
+    instances: 1,
+    exec_mode: 'fork',
+    autorestart: true,
+    watch: false,
+    max_memory_restart: '1G',
+    env: {
+      NODE_ENV: 'production',
+      PORT: 3010
+    },
+    log_rotate: true,
+    max_size: '10M',
+    retain: '10',
+    log_date_format: 'YYYY-MM-DD HH:mm:ss',
+    error_file: 'logs/pm2/err.log',
+    out_file: 'logs/pm2/out.log',
+    log_file: 'logs/pm2/combined.log',
+    time: true,
+    ignore_watch: [
+      'node_modules',
+      'logs',
+      '.git',
+      '*.log'
+    ],
+    min_uptime: 5000,
+    max_restarts: 5,
+    restart_delay: 4000,
+    listen_timeout: 50000,
+    kill_timeout: 5000,
+    node_args: '--max-old-space-size=1536'
+  }]
+}; 

inventory-server/package.json

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+{
+  "name": "inventory-server",
+  "version": "1.0.0",
+  "description": "Backend server for inventory management system",
+  "main": "src/server.js",
+  "scripts": {
+    "start": "node src/server.js",
+    "dev": "nodemon src/server.js",
+    "prod": "pm2 start ecosystem.config.js",
+    "prod:stop": "pm2 stop inventory-server",
+    "prod:restart": "pm2 restart inventory-server",
+    "prod:logs": "pm2 logs inventory-server",
+    "prod:status": "pm2 status inventory-server",
+    "setup": "mkdir -p logs uploads",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "csv-parse": "^5.5.3",
+    "dotenv": "^16.3.1",
+    "express": "^4.18.2",
+    "multer": "^1.4.5-lts.1",
+    "mysql2": "^3.7.0",
+    "pm2": "^5.3.0",
+    "uuid": "^9.0.1"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.2"
+  }
+}

inventory-server/src/db/schema.sql

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+CREATE DATABASE IF NOT EXISTS inventory_db;
+USE inventory_db;
+
+CREATE TABLE IF NOT EXISTS products (
+  id VARCHAR(36) PRIMARY KEY,
+  sku VARCHAR(50) UNIQUE NOT NULL,
+  name VARCHAR(255) NOT NULL,
+  description TEXT,
+  category VARCHAR(100),
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS inventory_levels (
+  id VARCHAR(36) PRIMARY KEY,
+  product_id VARCHAR(36) NOT NULL,
+  quantity INT NOT NULL DEFAULT 0,
+  reorder_point INT,
+  reorder_quantity INT,
+  last_reorder_date TIMESTAMP,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  FOREIGN KEY (product_id) REFERENCES products(id)
+);
+
+CREATE TABLE IF NOT EXISTS inventory_transactions (
+  id VARCHAR(36) PRIMARY KEY,
+  product_id VARCHAR(36) NOT NULL,
+  transaction_type ENUM('purchase', 'sale', 'adjustment') NOT NULL,
+  quantity INT NOT NULL,
+  transaction_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  reference_number VARCHAR(100),
+  notes TEXT,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  FOREIGN KEY (product_id) REFERENCES products(id)
+); 

inventory-server/src/routes/products.js

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+const express = require('express');
+const router = express.Router();
+const { v4: uuidv4 } = require('uuid');
+const { importProductsFromCSV } = require('../utils/csvImporter');
+const multer = require('multer');
+
+// Configure multer for file uploads
+const upload = multer({ dest: 'uploads/' });
+
+// Get all products with their current inventory levels
+router.get('/', async (req, res) => {
+  const pool = req.app.locals.pool;
+  try {
+    const [rows] = await pool.query(`
+      SELECT p.*, il.quantity, il.reorder_point, il.reorder_quantity
+      FROM products p
+      LEFT JOIN inventory_levels il ON p.id = il.product_id
+      ORDER BY p.created_at DESC
+    `);
+    res.json(rows);
+  } catch (error) {
+    console.error('Error fetching products:', error);
+    res.status(500).json({ error: 'Failed to fetch products' });
+  }
+});
+
+// Get a single product with its inventory details
+router.get('/:id', async (req, res) => {
+  const pool = req.app.locals.pool;
+  try {
+    const [rows] = await pool.query(`
+      SELECT p.*, il.quantity, il.reorder_point, il.reorder_quantity
+      FROM products p
+      LEFT JOIN inventory_levels il ON p.id = il.product_id
+      WHERE p.id = ?
+    `, [req.params.id]);
+    
+    if (rows.length === 0) {
+      return res.status(404).json({ error: 'Product not found' });
+    }
+    res.json(rows[0]);
+  } catch (error) {
+    console.error('Error fetching product:', error);
+    res.status(500).json({ error: 'Failed to fetch product' });
+  }
+});
+
+// Create a new product
+router.post('/', async (req, res) => {
+  const pool = req.app.locals.pool;
+  const { sku, name, description, category } = req.body;
+  const id = uuidv4();
+  
+  try {
+    const connection = await pool.getConnection();
+    try {
+      await connection.beginTransaction();
+      
+      await connection.query(
+        'INSERT INTO products (id, sku, name, description, category) VALUES (?, ?, ?, ?, ?)',
+        [id, sku, name, description, category]
+      );
+      
+      await connection.query(
+        'INSERT INTO inventory_levels (id, product_id, quantity) VALUES (?, ?, 0)',
+        [uuidv4(), id]
+      );
+      
+      await connection.commit();
+      res.status(201).json({ id, sku, name, description, category });
+    } catch (error) {
+      await connection.rollback();
+      throw error;
+    } finally {
+      connection.release();
+    }
+  } catch (error) {
+    console.error('Error creating product:', error);
+    res.status(500).json({ error: 'Failed to create product' });
+  }
+});
+
+// Import products from CSV
+router.post('/import', upload.single('file'), async (req, res) => {
+  if (!req.file) {
+    return res.status(400).json({ error: 'No file uploaded' });
+  }
+
+  try {
+    const result = await importProductsFromCSV(req.file.path, req.app.locals.pool);
+    // Clean up the uploaded file
+    require('fs').unlinkSync(req.file.path);
+    res.json(result);
+  } catch (error) {
+    console.error('Error importing products:', error);
+    res.status(500).json({ error: 'Failed to import products' });
+  }
+});
+
+// Update product inventory
+router.post('/:id/inventory', async (req, res) => {
+  const pool = req.app.locals.pool;
+  const { quantity, type, notes } = req.body;
+  
+  try {
+    const connection = await pool.getConnection();
+    try {
+      await connection.beginTransaction();
+      
+      // Create inventory transaction
+      await connection.query(
+        'INSERT INTO inventory_transactions (id, product_id, transaction_type, quantity, notes) VALUES (?, ?, ?, ?, ?)',
+        [uuidv4(), req.params.id, type, quantity, notes]
+      );
+      
+      // Update inventory level
+      const quantityChange = type === 'sale' ? -quantity : quantity;
+      await connection.query(
+        'UPDATE inventory_levels SET quantity = quantity + ? WHERE product_id = ?',
+        [quantityChange, req.params.id]
+      );
+      
+      await connection.commit();
+      res.json({ success: true });
+    } catch (error) {
+      await connection.rollback();
+      throw error;
+    } finally {
+      connection.release();
+    }
+  } catch (error) {
+    console.error('Error updating inventory:', error);
+    res.status(500).json({ error: 'Failed to update inventory' });
+  }
+});
+
+module.exports = router; 

inventory-server/src/server.js

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+require('dotenv').config();
+const express = require('express');
+const cors = require('cors');
+const mysql = require('mysql2/promise');
+const productsRouter = require('./routes/products');
+const path = require('path');
+const fs = require('fs');
+
+// Ensure required directories exist
+['logs', 'uploads'].forEach(dir => {
+  if (!fs.existsSync(dir)) {
+    fs.mkdirSync(dir, { recursive: true });
+  }
+});
+
+const app = express();
+
+// Middleware
+app.use(cors({
+  origin: process.env.CORS_ORIGIN,
+  credentials: true
+}));
+app.use(express.json());
+
+// Request logging middleware
+app.use((req, res, next) => {
+  const start = Date.now();
+  res.on('finish', () => {
+    const duration = Date.now() - start;
+    console.log(
+      `[${new Date().toISOString()}] ${req.method} ${req.url} ${res.statusCode} ${duration}ms`
+    );
+  });
+  next();
+});
+
+// Database connection pool
+const pool = mysql.createPool({
+  host: process.env.DB_HOST,
+  user: process.env.DB_USER,
+  password: process.env.DB_PASSWORD,
+  database: process.env.DB_NAME,
+  waitForConnections: true,
+  connectionLimit: process.env.NODE_ENV === 'production' ? 20 : 10,
+  queueLimit: 0,
+  enableKeepAlive: true,
+  keepAliveInitialDelay: 0
+});
+
+// Make pool available to routes
+app.locals.pool = pool;
+
+// Test database connection
+pool.getConnection()
+  .then(connection => {
+    console.log('[Database] Connected successfully');
+    connection.release();
+  })
+  .catch(err => {
+    console.error('[Database] Error connecting:', err);
+    process.exit(1); // Exit if we can't connect to the database
+  });
+
+// Routes
+app.use('/api/products', productsRouter);
+
+// Basic health check route
+app.get('/health', (req, res) => {
+  res.json({ 
+    status: 'ok',
+    timestamp: new Date().toISOString(),
+    environment: process.env.NODE_ENV
+  });
+});
+
+// Error handling middleware
+app.use((err, req, res, next) => {
+  console.error(`[${new Date().toISOString()}] Error:`, err);
+  res.status(500).json({ 
+    error: process.env.NODE_ENV === 'production' 
+      ? 'An internal server error occurred' 
+      : err.message 
+  });
+});
+
+// Handle uncaught exceptions
+process.on('uncaughtException', (err) => {
+  console.error(`[${new Date().toISOString()}] Uncaught Exception:`, err);
+  process.exit(1);
+});
+
+process.on('unhandledRejection', (reason, promise) => {
+  console.error(`[${new Date().toISOString()}] Unhandled Rejection at:`, promise, 'reason:', reason);
+});
+
+const PORT = process.env.PORT || 3000;
+app.listen(PORT, () => {
+  console.log(`[Server] Running in ${process.env.NODE_ENV || 'development'} mode on port ${PORT}`);
+}); 

inventory-server/src/utils/csvImporter.js

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+const fs = require('fs');
+const { parse } = require('csv-parse');
+const { v4: uuidv4 } = require('uuid');
+
+async function importProductsFromCSV(filePath, pool) {
+  return new Promise((resolve, reject) => {
+    const products = [];
+    
+    fs.createReadStream(filePath)
+      .pipe(parse({
+        columns: true,
+        skip_empty_lines: true
+      }))
+      .on('data', async (row) => {
+        products.push({
+          id: uuidv4(),
+          sku: row.sku,
+          name: row.name,
+          description: row.description || null,
+          category: row.category || null
+        });
+      })
+      .on('end', async () => {
+        try {
+          const connection = await pool.getConnection();
+          
+          try {
+            await connection.beginTransaction();
+            
+            for (const product of products) {
+              await connection.query(
+                'INSERT INTO products (id, sku, name, description, category) VALUES (?, ?, ?, ?, ?)',
+                [product.id, product.sku, product.name, product.description, product.category]
+              );
+              
+              // Initialize inventory level for the product
+              await connection.query(
+                'INSERT INTO inventory_levels (id, product_id, quantity) VALUES (?, ?, 0)',
+                [uuidv4(), product.id]
+              );
+            }
+            
+            await connection.commit();
+            resolve({ imported: products.length });
+          } catch (error) {
+            await connection.rollback();
+            reject(error);
+          } finally {
+            connection.release();
+          }
+        } catch (error) {
+          reject(error);
+        }
+      })
+      .on('error', (error) => {
+        reject(error);
+      });
+  });
+}
+
+module.exports = {
+  importProductsFromCSV
+};