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broswer-automation/app/chrome-extension/PERSISTENT_CONNECTION_CHANGES.md

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# Persistent Connection Implementation Summary
## Overview
Modified the Chrome extension to implement persistent connection management that maintains connections until explicitly disconnected by the user.
## Key Changes Made
### 1. Enhanced RemoteServerClient (`utils/remote-server-client.ts`)
#### Connection State Persistence
- **Added persistent connection state management**:
- `persistentConnectionEnabled = true` by default
- `connectionStateKey = 'remoteServerConnectionState'` for storage
- Automatic state saving/loading to chrome.storage.local
#### New Methods Added
- `saveConnectionState()`: Saves connection state to chrome storage
- `loadConnectionState()`: Loads and restores connection state on startup
- `clearConnectionState()`: Clears saved state on manual disconnect
- `setPersistentConnection(enabled)`: Enable/disable persistent behavior
- `isPersistentConnectionEnabled()`: Get current persistence setting
#### Enhanced Reconnection Logic
- **Increased max reconnection attempts**: From 10 to 50 for persistent connections
- **Extended reconnection delays**: Up to 60 seconds for persistent connections
- **Smarter reconnection**: Only attempts reconnection for unexpected disconnections
- **Connection restoration**: Automatically restores connections within 24 hours
#### Connection Lifecycle Improvements
- **State saving on connect**: Automatically saves state when connection established
- **State clearing on disconnect**: Clears state only on manual disconnect
- **Robust error handling**: Better handling of connection timeouts and errors
### 2. Enhanced Background Script (`entrypoints/background/index.ts`)
#### Browser Event Listeners
- **Added `initBrowserEventListeners()`** function with listeners for:
- `chrome.runtime.onStartup`: Browser startup detection
- `chrome.runtime.onInstalled`: Extension install/update events
- `chrome.runtime.onSuspend`: Browser suspension events
- `chrome.tabs.onActivated`: Tab switch monitoring
- `chrome.windows.onFocusChanged`: Window focus monitoring
#### Connection Health Monitoring
- **Added `startConnectionHealthCheck()`**: 5-minute interval health checks
- **Periodic status logging**: Regular connection status verification
- **Proactive monitoring**: Detects and logs connection state changes
### 3. Enhanced Popup UI (`entrypoints/popup/App.vue`)
#### Visual Indicators
- **Persistent connection badge**: "🔗 Persistent: Active" indicator
- **Enhanced status text**: "Connected (Persistent)" vs "Disconnected - Click Connect for persistent connection"
- **Persistent info message**: "🔗 Connection will persist until manually disconnected"
#### CSS Styling
- **`.persistent-indicator`**: Styling for persistent connection elements
- **`.persistent-badge`**: Green gradient badge with shadow
- **`.persistent-info`**: Info box with green accent border
#### Status Text Updates
- **Clear messaging**: Emphasizes persistent nature of connections
- **User guidance**: Explains that connections persist until manual disconnect
## Technical Implementation Details
### Connection State Storage
```javascript
const state = {
wasConnected: boolean,
connectionTime: number,
serverUrl: string,
lastSaveTime: number
}
```
### Reconnection Strategy
- **Exponential backoff**: 5s, 10s, 20s, 40s, up to 60s intervals
- **Persistent attempts**: Up to 50 attempts for persistent connections
- **Smart restoration**: Only restores connections from last 24 hours
### Browser Event Handling
- **Tab switches**: Connection maintained across all tab operations
- **Window focus**: Connection persists during window focus changes
- **Browser suspension**: State saved before suspension, restored after
- **Extension updates**: Connection state preserved across updates
## Behavior Changes
### Before Implementation
- Manual connection required each session
- Connections might not survive browser events
- Limited reconnection attempts (10)
- No connection state persistence
### After Implementation
- **"Connect once, stay connected"** behavior
- **Connections persist across**:
- Popup open/close cycles
- Browser tab switches
- Window focus changes
- Extended idle periods
- Browser suspension/resume
- **Robust reconnection**: Up to 50 attempts with smart backoff
- **State restoration**: Automatic connection restoration after browser restart
- **Manual disconnect only**: Connections only terminate when explicitly disconnected
## User Experience Improvements
### Clear Visual Feedback
- Persistent connection status clearly indicated
- Real-time connection duration display
- Visual badges and indicators for connection state
### Predictable Behavior
- Users know connections will persist until manually disconnected
- No unexpected disconnections during tool operations
- Consistent behavior across browser lifecycle events
### Robust Connectivity
- Automatic reconnection when server becomes available
- Connection state restoration after browser restart
- Extended retry attempts for better reliability
## Testing
- Comprehensive test plan provided in `PERSISTENT_CONNECTION_TEST_PLAN.md`
- Covers all aspects of persistent connection behavior
- Includes verification points and success criteria
## Compatibility
- Maintains backward compatibility with existing MCP clients
- No breaking changes to tool execution or API
- Enhanced reliability without changing core functionality