[dependencies]
magneto-serge = "0.0.1"

# Via npm (GitHub Packages)
npm install @taciclei/magneto-serge

const { MagnetoProxy, ProxyMode } = require('@taciclei/magneto-serge');

Multi-language bindings are in development. See ROADMAP.md for status.

The fastest way to get started with the complete ecosystem:

# Check dependencies
make help           # Show all available commands
./scripts/check-deps.sh  # Verify dependencies

# Quick setup (install + build)
make quick          # Install deps + build Rust

# Install everything (Rust + Node.js backends + Angular clients)
make install        # Install all dependencies
make build-all      # Build everything

# Start complete stack (API + Backend + Frontend)
make dev            # Launch in tmux (automatic)
make dev-manual     # Get manual instructions

# Individual services
make run-api               # Start Magneto API (port 8889)
make run-backend           # Start Node.js backend (port 3000)
make run-client-simple     # Start Angular client (port 4201)
make run-client-hydra      # Start Angular Hydra demo (port 4200)

# CLI examples
make example-record  # Record HTTP requests
make example-replay  # Replay from cassette
make example-auto    # Auto mode (smart)

# Utilities
make status         # Check running services
make ports          # Show used ports
make clean-all      # Clean everything

Complete Makefile reference: Run make help for all 50+ commands.

use magneto_serge::{MagnetoProxy, ProxyMode};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Create proxy with auto mode (record if missing, else replay)
    let proxy = MagnetoProxy::new_internal("./cassettes")?
        .with_port(8888)
        .with_mode(ProxyMode::Auto);

    // Start recording
    proxy.start_recording_internal("my-api-test".to_string())?;

    // Configure your HTTP client to use proxy localhost:8888
    // Make your API requests here...

    // Stop and save cassette
    proxy.stop_recording_internal()?;
    proxy.shutdown_internal()?;

    Ok(())
}

const { MagnetoProxy, ProxyMode } = require('@taciclei/magneto-serge');

// Create proxy instance
const proxy = new MagnetoProxy('./cassettes');
proxy.setPort(8888);
proxy.setMode(ProxyMode.Auto);

// Start recording
proxy.startRecording('my-api-test');

// Configure your HTTP client to proxy through localhost:8888
// Make your API requests...

// Stop recording
proxy.stopRecording();
proxy.shutdown();

graph LR
    A[Your App] -->|HTTP Request| B[Magnéto-Serge<br/>Proxy :8888]
    B -->|Record Mode| C[Real API]
    B -->|Replay Mode| D[Cassette]
    C -->|Response| B
    D -->|Cached| B
    B -->|Response| A
    B -->|Save| D

3 Modes:

• 🔴 Record: Proxy → Real API → Save to cassette
• ▶️ Replay: Proxy → Load from cassette → Return cached
• 🟢 Auto: Record if cassette missing, replay if exists

const { MagnetoProxy, ProxyMode } = require('@taciclei/magneto-serge');
const axios = require('axios');

async function testWithMagneto() {
  const proxy = new MagnetoProxy('./cassettes');
  proxy.setPort(8888);
  proxy.setMode(ProxyMode.Auto);
  proxy.startRecording('github-api-test');

  // Configure axios to use proxy
  const client = axios.create({
    proxy: {
      host: 'localhost',
      port: 8888
    }
  });

  try {
    // First run: records from real API
    // Second run: replays from cassette
    const response = await client.get('https://api.github.com/users/octocat');
    console.log('User:', response.data.login);
  } finally {
    proxy.stopRecording();
    proxy.shutdown();
  }
}

testWithMagneto();

use magneto_serge::{MagnetoProxy, ProxyMode};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let proxy = MagnetoProxy::new_internal("./cassettes")?
        .with_port(8888)
        .with_mode(ProxyMode::Auto);

    proxy.start_recording_internal("github-api-test".to_string())?;

    // Configure reqwest to use proxy
    let client = reqwest::Client::builder()
        .proxy(reqwest::Proxy::all("http://localhost:8888")?)
        .build()?;

    let response = client
        .get("https://api.github.com/users/octocat")
        .send()
        .await?;

    println!("Status: {}", response.status());

    proxy.stop_recording_internal()?;
    proxy.shutdown_internal()?;

    Ok(())
}

#[cfg(test)]
mod tests {
    use magneto_serge::{MagnetoProxy, ProxyMode};

    #[test]
    fn test_api_integration() {
        let proxy = MagnetoProxy::new_internal("./test-cassettes")
            .expect("Failed to create proxy")
            .with_port(9999)
            .with_mode(ProxyMode::Auto);

        proxy.start_recording_internal("integration-test".to_string())
            .expect("Failed to start recording");

        // Your test code here
        // Configure HTTP client to use localhost:9999

        proxy.stop_recording_internal()
            .expect("Failed to stop recording");
    }
}

Magneto-Serge provides a complete REST API with Hydra/JSON-LD and OpenAPI 3.0 support for remote proxy control.

# Start the API server
magneto api

# With authentication
magneto api --auth --api-key your-secret-key

# Custom host/port
magneto api --host 0.0.0.0 --port 8889

• ✅ Hypermedia (HATEOAS): Self-documenting with Hydra/JSON-LD links
• ✅ OpenAPI 3.0: Complete specification at /openapi.json
• ✅ Authentication: Bearer token support
• ✅ CORS: Cross-origin requests enabled
• ✅ Language-agnostic: Use from any HTTP client

# Start proxy via API
curl -X POST http://localhost:8889/proxy/start \
  -H "Content-Type: application/json" \
  -d '{
    "mode": "auto",
    "cassette_name": "my-test",
    "port": 8888
  }'

# Check status
curl http://localhost:8889/proxy/status

# Stop proxy
curl -X POST http://localhost:8889/proxy/stop

import requests

api = "http://localhost:8889"

# Start proxy
response = requests.post(f"{api}/proxy/start", json={
    "mode": "auto",
    "cassette_name": "test",
    "port": 8888
})

# Get status
status = requests.get(f"{api}/proxy/status").json()
print(f"Running: {status['data']['running']}")

# Follow Hydra links
links = status.get('hydra:link', [])
for link in links:
    print(f"→ {link['title']}: {link['hydra:target']}")

const fetch = require('node-fetch');

const api = 'http://localhost:8889';

// Start proxy
await fetch(`${api}/proxy/start`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    mode: 'auto',
    cassette_name: 'test',
    port: 8888
  })
});

// Get status with authentication
const status = await fetch(`${api}/proxy/status`, {
  headers: { 'Authorization': 'Bearer your-key' }
}).then(r => r.json());

console.log('Running:', status.data.running);

#!/bin/bash
API="http://localhost:8889"

# List cassettes
curl $API/cassettes | jq '.data[].name'

# Start proxy with authentication
curl -X POST $API/proxy/start \
  -H "Authorization: Bearer your-key" \
  -H "Content-Type: application/json" \
  -d '{"mode": "record", "cassette_name": "test"}'

# Get OpenAPI spec
curl $API/openapi.json | jq '.info'

Every API response includes Hydra links for discoverability:

{
  "@context": "https://www.w3.org/ns/hydra/core",
  "@type": "hydra:Resource",
  "success": true,
  "data": { "message": "Proxy started successfully" },
  "hydra:link": [
    {
      "@type": "hydra:Link",
      "hydra:target": "http://localhost:8889/proxy/status",
      "title": "Check Proxy Status",
      "hydra:operation": [{
        "@type": "http://schema.org/ViewAction",
        "method": "GET"
      }]
    }
  ]
}

Clients can discover and navigate the API dynamically without hardcoding URLs!

See docs/API.md for complete reference including:

• Authentication setup
• Request/response schemas
• Error handling
• Integration examples (CI/CD, Docker, Kubernetes)
• Swagger UI setup

Magneto-Serge includes a complete web stack with multiple frontend/backend architectures.

magneto record test
magneto replay test

Angular Client
    ↓
Node.js Backend
    ↓
Magneto API

Angular + Alcaeus
    ↓
Magneto API

# Automatic (with tmux)
make dev

# Or manual (3 terminals)
make dev-manual

Opens:

• API: http://localhost:8889 (Rust/Axum)
• Backend: http://localhost:3000 (Node.js/Express)
• Client: http://localhost:4201 (Angular)

Location: examples/nodejs-backend/

Alcaeus wrapper exposing simplified REST API:

cd examples/nodejs-backend
npm install
npm start
# → http://localhost:3000

Features:

• ✅ Alcaeus native (Node.js, zero polyfill)
• ✅ Server-side cache (shared across clients)
• ✅ JSON-LD → JSON simplification
• ✅ Production-ready architecture

Docs: nodejs-backend/README.md | ARCHITECTURE.md

Location: examples/angular-simple-client/

Production Angular client using the Node.js backend:

cd examples/angular-simple-client
npm install
npm start
# → http://localhost:4201

Features:

• ✅ Native HttpClient (no Alcaeus/RDF)
• ✅ Simple TypeScript types
• ✅ Lightweight build (~50kb)
• ✅ Full proxy control dashboard

Docs: angular-simple-client/README.md

Location: examples/angular-client/

Demonstration of Hydra/JSON-LD navigation with Alcaeus in browser:

cd examples/angular-client
npm install
npm start
# → http://localhost:4200

Features:

• ✅ Alcaeus integration in browser
• ✅ Automatic Hydra navigation (zero hardcoded URLs)
• ✅ JSON-LD parsing
• ⚠️ Requires Node.js polyfills (+100kb)

Docs: angular-client/README.md

• QUICK_START.md: Comprehensive startup guide with 5 use cases
• examples/README.md: All examples catalog
• examples/nodejs-backend/ARCHITECTURE.md: 3-tier production architecture

Cassettes are language-agnostic JSON files - record in Rust, replay in JavaScript!

{
  "version": "1.0",
  "name": "my-api-test",
  "recorded_at": "2025-10-10T14:30:00Z",
  "interactions": [
    {
      "type": "Http",
      "request": {
        "method": "GET",
        "url": "https://api.example.com/users",
        "headers": {"accept": "application/json"},
        "body": null
      },
      "response": {
        "status": 200,
        "headers": {"content-type": "application/json"},
        "body": [...]
      }
    },
    {
      "type": "WebSocket",
      "url": "wss://stream.example.com",
      "messages": [
        {"direction": "Sent", "timestamp_ms": 0, "msg_type": "Text", "data": "..."},
        {"direction": "Received", "timestamp_ms": 120, "msg_type": "Text", "data": "..."}
      ]
    }
  ]
}

Format features:

• ✅ JSON or MessagePack (with msgpack feature)
• ✅ Share across languages
• ✅ Version controlled (git-friendly)
• ✅ Human readable

graph TB
    A[MagnetoProxy API] --> B[HTTP Handler]
    A --> C[WebSocket Interceptor]
    B --> D[Recorder/Player]
    C --> D
    D --> E[Cassette Storage JSON]
    B --> F[Hudsucker MITM]
    C --> G[tokio-tungstenite]
    F --> H[TLS Certificate Manager]

Core components:

• 🎯 MagnetoProxy: Public API (Rust + NAPI-RS for JS)
• 🔄 HTTP Handler: MITM proxy with Hudsucker
• 🔌 WebSocket Interceptor: Bidirectional message capture
• 💾 Recorder/Player: Cassette serialization & matching
• 🔐 TLS Manager: Auto-generated certificates

// Record real API once, replay thousands of times
// ✅ No network flakiness
// ✅ Instant test execution (no API calls)
// ✅ Offline development
// ✅ Deterministic tests in CI/CD

// Capture production traffic
// Replay locally for investigation
// Inspect every request/response

// Mock external APIs during development
// Work offline with cached responses
// Consistent test fixtures across team

# Clone repository
git clone https://github.com/taciclei/magneto-serge.git
cd magneto-serge

# Check dependencies
./scripts/check-deps.sh

# Quick setup
make quick          # Install + build in one command

# Or step by step
make install        # Install all dependencies
make build-all      # Build everything
make test           # Run all tests

# Development workflow
make dev            # Start complete stack (tmux)
make status         # Check services status
make clean-all      # Clean everything

# CI/CD checks
make ci             # Run fmt, clippy, tests

# See all commands
make help

# Build Rust library
cargo build --release

# Run all tests (68 tests)
cargo test --all-features

# Run integration tests
cargo test --test integration_test

# Lint
cargo clippy --all-features -- -D warnings

# Format
cargo fmt --all

# Build JavaScript bindings
cd bindings/javascript
npm install
npm run build

# Build Angular clients
cd examples/angular-simple-client && npm install && npm run build
cd examples/angular-client && npm install && npm run build

# Build Node.js backend
cd examples/nodejs-backend && npm install

# Rust unit tests (47 tests)
cargo test --lib

# Integration tests (9 tests)
cargo test --test integration_test

# WebSocket tests (5 tests)
cargo test --test websocket_integration

# JavaScript tests
cd bindings/javascript
node test-complete.js

Current Test Status: 68/68 passing ✅

• 33 Rust unit tests
• 9 Rust integration tests
• 5 WebSocket integration tests
• 10+ JavaScript API tests
• 7+ JavaScript HTTP tests

magneto-serge/
├── src/
│   ├── lib.rs              # Core library
│   ├── proxy.rs            # MagnetoProxy implementation
│   ├── cassette.rs         # Cassette format
│   ├── player.rs           # Replay engine
│   ├── recorder.rs         # Record engine
│   ├── websocket/          # WebSocket support
│   ├── tls/                # TLS certificate management
│   └── error.rs            # Error types
├── bindings/
│   └── javascript/         # NAPI-RS bindings for Node.js
│       ├── src/lib.rs
│       ├── package.json
│       └── index.js
├── tests/                  # Integration tests
│   ├── integration_test.rs
│   └── websocket_integration.rs
├── examples/               # Usage examples
└── docs/                   # Documentation
    ├── ROADMAP.md
    └── ARCHITECTURE.md

Web Ecosystem:

Bindings:

✅ Completed:

• Core Rust library with full HTTP/HTTPS support
• WebSocket record/replay
• JavaScript bindings (NAPI-RS)
• 68 tests passing
• CI/CD pipeline functional
• Auto-generated TLS certificates

🚧 In Progress:

• Publishing to crates.io (pending email verification)
• Publishing to npm (GitHub Packages)
• TypeScript definitions for JS bindings

📅 Planned:

• Python bindings (UniFFI)
• Java/Kotlin bindings
• CLI tool (magneto command)
• Performance benchmarks
• Release 1.0

See ROADMAP.md for detailed milestones.

We welcome contributions! Issues are now enabled on this repository.

Here's how to contribute:

1. 🍴 Fork the repository
2. 🔧 Create a feature branch (git checkout -b feature/amazing)
3. ✅ Add tests for your changes
4. 🎨 Run cargo fmt and cargo clippy
5. 📝 Commit with descriptive message
6. 🚀 Push to your fork
7. 🎉 Open a Pull Request

Development requirements:

• Rust 1.75+ (MSRV)
• Cargo
• (Optional) Node.js 18+ for JavaScript bindings
• (Optional) Python 3.9+ for Python bindings (planned)

Areas where we need help:

• 🐍 Python bindings (UniFFI)
• ☕ Java/Kotlin bindings
• 📚 Documentation improvements
• 🧪 More integration tests
• 🎨 Logo design
• 🌐 Translations

Current benchmarks (Rust):

• HTTP proxy throughput: ~5000 req/s (target met)
• WebSocket message rate: ~10k msg/s (target met)
• Proxy latency: <1ms p50
• Memory footprint: <50 MB

Test environment:

• MacBook Pro M1 (ARM64)
• Rust 1.75
• Release build with LTO

Note: Formal benchmarks coming in Phase 4. Use cargo bench for testing.

• ⚠️ HTTPS interception requires installing CA certificate in system trust store
• ⚠️ WebSocket replay timing may vary slightly from recording
• ⚠️ Large cassettes (>100MB) may impact performance

See Issues for complete list and workarounds.

Licensed under either of:

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

Inspired by:

• VCR - Ruby HTTP recording library (original)
• Polly.JS - JavaScript HTTP mocking
• Betamax - Python VCR port
• VHS - Rust VCR attempt (unmaintained, used as starting point)

Built with:

• Hudsucker - HTTP/HTTPS MITM proxy framework
• NAPI-RS - Node.js addon framework for Rust
• Tokio - Async runtime for Rust
• tokio-tungstenite - WebSocket implementation
• rcgen - TLS certificate generation
• serde - Serialization framework

• 🏠 Homepage: GitHub Repository
• 📦 Crates.io: Coming soon
• 📦 npm: @taciclei/magneto-serge
• 📖 Documentation: docs/
• 💬 Issues: GitHub Issues
• 🎬 Discussions: GitHub Discussions