LCBro

# Chrome DevTools Protocol Support Implementation - Final Report ## Implementation Overview Full support for connecting to external browsers through Chrome DevTools Protocol (CDP) has been successfully implemented. This allows using already running browsers instead of creating new Playwright instances. ## 🎯 Implemented Components ### 1. **Extended Configuration** (`config/default.yaml`) ```yaml browser: engine: cdp # playwright | cdp cdp: enabled: true # enable CDP support host: "localhost" # CDP server host port: 9222 # CDP port autoDetect: true # automatic detection maxRetries: 3 # connection attempts retryDelay: 1000 # delay between attempts # Browser detection settings detection: enabled: true ports: [9222, 9223, 9224, 9225, 9226] timeout: 5000 # Browser launch settings launch: autoLaunch: false browserPath: null userDataDir: null additionalArgs: [] # Connection settings connection: timeout: 30000 keepAlive: true reconnect: true maxReconnects: 5 ``` ### 2. **CDP Browser Manager** (`src/core/cdp-browser-manager.ts`) - **WebSocket connections**: CDP connection management - **Automatic detection**: browser discovery on ports - **Reconnection**: automatic connection recovery - **Command execution**: navigation, JavaScript, screenshots - **Event handling**: console, network, page loading ### 3. **CDP Detector** (`src/utils/cdp-detector.ts`) - **Port scanning**: CDP browser discovery - **Endpoint validation**: CDP availability checking - **Monitoring**: new browser tracking - **Parallel discovery**: fast scanning of multiple ports ### 4. **Updated Browser Manager** (`src/core/browser-manager.ts`) - **Dual engine support**: Playwright and CDP - **Automatic selection**: based on configuration - **Unified interface**: transparent switching between engines - **Context management**: for both browser types ### 5. **Utilities and Scripts** #### **cdp-browser-launcher.sh** - Browser Launcher - Automatic browser launching with CDP - Chrome, Chromium, Edge support - Multiple browsers on different ports - Browser status monitoring ## 🔧 System Architecture ### **CDP Flow** ``` 1. Browser Detection → CDPDetector 2. Browser Connection → CDPBrowserManager 3. Connection Management → WebSocket + CDP Commands 4. Operation Execution → Navigation, JavaScript, Screenshots 5. Event Handling → Console, Network, Page events ``` ### **Integration with Existing System** ``` BrowserManager (universal) ├── Playwright Engine (existing) └── CDP Engine (new) ├── CDPBrowserManager ├── CDPDetector └── WebSocket Connections ``` ## 📊 CDP Capabilities ### **Automatic Detection** ```typescript // Port scanning for browser discovery const browsers = await detector.detectBrowsers({ host: 'localhost', ports: [9222, 9223, 9224, 9225, 9226], timeout: 5000 }); console.log(`Found ${browsers.length} browsers`); ``` ### **Browser Connection** ```typescript // Connection to specific browser const contextId = await cdpManager.connectToBrowser(browserInfo); // Navigation await cdpManager.navigateToUrl(contextId, 'https://example.com'); // JavaScript execution const result = await cdpManager.executeScript(contextId, 'document.title'); // Screenshot creation const screenshot = await cdpManager.takeScreenshot(contextId, { fullPage: true }); ``` ### **Event Monitoring** ```typescript // Browser event handling ws.onmessage = (event) => { const message = JSON.parse(event.data); switch (message.method) { case 'Page.loadEventFired': console.log('Page loaded'); break; case 'Runtime.consoleAPICalled': console.log('Console message:', message.params); break; case 'Network.responseReceived': console.log('Network request:', message.params.response.url); break; } }; ``` ## 🚀 Practical Usage ### **1. Browser Launching** ```bash # Automatic Chrome launch with CDP ./scripts/cdp-browser-launcher.sh # Multiple browser launch ./scripts/cdp-browser-launcher.sh -n 3 -p 9222,9223,9224 # Edge launch with CDP ./scripts/cdp-browser-launcher.sh -b edge -d /tmp/edge-profiles ``` ### **2. MCP Server Configuration** ```yaml # Automatic detection browser: engine: cdp cdp: enabled: true autoDetect: true detection: ports: [9222, 9223, 9224, 9225, 9226] # Connection to specific browser browser: engine: cdp cdp: enabled: true autoDetect: false host: "localhost" port: 9222 ``` ### **3. Availability Check** ```bash # Browser check curl http://localhost:9222/json/version curl http://localhost:9223/json/version # Tab list curl http://localhost:9222/json # WebSocket URL curl http://localhost:9222/json/version | jq '.webSocketDebuggerUrl' ``` ## 💡 CDP Advantages ### **Performance** - ✅ **No overhead**: using existing browsers - ✅ **Fast switching**: between tabs without restart - ✅ **Fewer resources**: one browser for multiple sessions ### **Flexibility** - ✅ **User profiles**: access to settings and extensions - ✅ **Any browsers**: Chrome, Chromium, Edge - ✅ **Multiple ports**: session isolation ### **Integration** - ✅ **Existing browsers**: connection to already running - ✅ **User data**: work with real profiles - ✅ **Extensions**: access to installed extensions ### **Debugging** - ✅ **Direct DevTools access**: full browser visibility - ✅ **Console messages**: error and log monitoring - ✅ **Network requests**: HTTP traffic tracking ## 🔍 Monitoring and Debugging ### **CDP Operation Logging** ```json { "level": "info", "msg": "Found CDP browser", "browser": { "id": "browser_9222", "title": "Chrome Browser", "type": "chrome", "url": "https://example.com", "webSocketDebuggerUrl": "ws://localhost:9222/devtools/browser/..." } } { "level": "info", "msg": "CDP connection established", "contextId": "cdp_1705135815123_abc123", "browserId": "browser_9222" } ``` ### **Connection Monitoring** ```json { "level": "warn", "msg": "CDP connection closed", "contextId": "cdp_1705135815123_abc123", "attemptingReconnect": true } { "level": "info", "msg": "CDP reconnection successful", "contextId": "cdp_1705135815123_abc123", "attempts": 2 } ``` ### **Browser Event Tracking** ```json { "level": "debug", "msg": "CDP event received", "contextId": "cdp_1705135815123_abc123", "method": "Page.loadEventFired" } { "level": "debug", "msg": "Browser console message", "contextId": "cdp_1705135815123_abc123", "consoleMessage": "Page loaded successfully" } ``` ## 🛡️ Security and Limitations ### **Security Recommendations** - Use CDP only in trusted networks - Restrict access by IP addresses - Don't use in production without additional protection ### **Limitations** - WebSocket connections may disconnect - CDP may be slower than Playwright for some operations - Requires running browser with CDP ### **Best Practices** - Enable auto-reconnection - Monitor connection status - Use for integration with existing browsers ## 📚 Documentation and Examples ### **Created Documentation** - [`docs/CDP_BROWSER_SUPPORT.md`](docs/CDP_BROWSER_SUPPORT.md) - Complete guide - [`docs/CDP_IMPLEMENTATION_SUMMARY.md`](docs/CDP_IMPLEMENTATION_SUMMARY.md) - Final report - Ready-to-use browser launch scripts ### **Usage Examples** - Automatic browser detection - Connection to specific ports - Multiple browsers - Event monitoring ## 🎯 Usage Scenarios ### **1. Test Integration** ```bash # Browser launch for tests google-chrome --remote-debugging-port=9222 --user-data-dir=/tmp/test-profile # MCP server connects to existing browser # Tests run in the same browser ``` ### **2. User Activity Monitoring** ```bash # User working in browser google-chrome --remote-debugging-port=9222 --user-data-dir=/home/user/.config/google-chrome # MCP server analyzes user activity ``` ### **3. Automation with Extensions** ```bash # Browser with installed extensions google-chrome --remote-debugging-port=9222 --user-data-dir=/home/user/.config/google-chrome # MCP server uses extensions for automation ``` ## 🚀 Ready for Use CDP support system is fully implemented and ready for use: - ✅ **All components** implemented and tested - ✅ **Configuration** set up with reasonable defaults - ✅ **Launch utilities** ready for use - ✅ **Documentation** created and up-to-date - ✅ **Backward compatibility** with Playwright maintained ### **Quick Start** 1. Launch browser with CDP: `./scripts/cdp-browser-launcher.sh` 2. Configure MCP server: `engine: cdp, cdp.enabled: true` 3. System automatically detects and connects to browser --- **Implemented with Claude Sonnet 4 model** **Date:** September 13, 2025 **Status:** Fully implemented and ready for use