WASM-PostgreSQL Learning Project

A step-by-step learning environment for WebAssembly (WASM) and PostgreSQL connections. This project is designed to help understand the integration between WASM, WebSockets, and PostgreSQL through hands-on implementation.

Project Structure

├── src/
│   ├── database/          # PostgreSQL client and operations
│   ├── websocket/         # WebSocket server and client
│   ├── wasm/              # WASM module loading utilities
│   ├── integration/       # WASM-WebSocket-Database bridge
│   └── index.ts           # Main entry point
├── tests/                 # Test files
├── scripts/               # Setup and utility scripts
├── wasm/                  # Rust WASM module (to be created)
└── examples/              # Example applications (to be created)

Prerequisites

• Node.js (v18 or higher)
• Docker and Docker Compose
• Rust (for WASM module development)

Quick Start

1. Install dependencies:

   npm install

2. Set up environment:

   cp .env.example .env

3. Start PostgreSQL database:

   ./scripts/setup-db.sh

4. Run tests:

   npm test

5. Build the project:

   npm run build

Learning Path

This project follows a structured learning approach:

1. Database Foundation - Learn PostgreSQL operations and connection patterns
2. WebSocket Communication - Understand real-time bidirectional communication
3. WASM Basics - Create and load WebAssembly modules
4. Integration - Connect all components into a working system

Development Commands

• npm run dev - Run development server
• npm run build - Build TypeScript to JavaScript
• npm test - Run all tests
• npm run test:watch - Run tests in watch mode
• npm run clean - Clean build artifacts

Database Management

• Start database: docker compose up -d postgres
• Stop database: docker compose down
• Connect to database: docker compose exec postgres psql -U postgres -d wasm_learning
• View logs: docker compose logs postgres

Project Goals

By completing this project, you will learn:

• PostgreSQL connection patterns and query execution
• WebSocket server implementation and client communication
• WebAssembly compilation, loading, and JavaScript interoperability
• System integration and error handling
• Testing strategies for distributed systems

Advanced Features

This project now includes advanced production-ready features:

Performance Optimization

• Connection Pooling: Efficient database connection management
• Query Result Caching: Intelligent caching with TTL and LRU eviction
• Performance Monitoring: Real-time metrics and slow query detection
• Memory Management: Automatic cleanup and resource optimization

Security Features

• Authentication: JWT tokens, API keys, username/password
• Authorization: Role-based access control (admin, user, readonly)
• Input Validation: SQL injection prevention and XSS protection
• Rate Limiting: Request throttling and DoS protection
• Audit Logging: Comprehensive security event logging

Documentation and Examples

• Step-by-step Tutorial: Complete learning guide (docs/TUTORIAL.md)
• Security Best Practices: Production security guide (docs/SECURITY.md)
• Troubleshooting Guide: Common issues and solutions (docs/TROUBLESHOOTING.md)
• Interactive Examples: Performance monitoring and security demos

Quick Demo

Try the advanced features:

# Performance monitoring demo
npx ts-node examples/performance-monitoring-demo.ts

# Security features demo
npx ts-node examples/security-demo.ts

# Interactive database playground
npx ts-node examples/security-demo.ts --websocket
open examples/database-playground.html

Resources

• PostgreSQL Documentation
• WebSocket API
• WebAssembly Documentation
• Rust and WebAssembly Book

License

MIT License - see LICENSE file for details.