Gate 2 Complete: Interactive VisionOS Features - Real-time Data, 3D Mempool, Fee Panel

[devin-ai-integration]

Gate 2 Complete: Interactive VisionOS Features - Real-time Data, 3D Mempool, Fee Panel

Summary

This PR implements Gate 2 ("Interaction Gate") requirements for the Spatial Mempool VisionOS app, adding real-time WebSocket connectivity, interactive 3D mempool visualization, live fee recommendations, and transaction/address search functionality. The implementation follows Apple visionOS 2 UX guidance with proper gaze/hand input support and smooth performance optimizations.

Key Features Added:

• Real-time WebSocket Connection: Live data streaming from mempool.space API for blocks, fees, and mempool updates
• 3D Mempool Strata Visualization: Color-coded fee layers with interactive toggle between blocks/mempool views
• Live Fee Panel: Real-time fee recommendations with connection status indicator
• Search Functionality: Transaction ID and Bitcoin address lookup with immersive drill-down
• Enhanced UI Integration: Overlay panels that work seamlessly with existing 3D interactions

Review & Testing Checklist for Human

• WebSocket Connection: Verify real-time data updates work correctly and connection handles failures gracefully (most critical - complex networking code with threading concerns)
• UI Integration: Test that new overlay panels don't interfere with existing 3D gesture handling and eye tracking
• Search Functionality: Validate transaction/address search works with real mempool.space API endpoints
• Memory Management: Check for potential WebSocket memory leaks or retain cycles during extended usage
• Fee Strata Display: Verify mempool visualization renders correctly and toggles smoothly between blocks/mempool views

Recommended Test Plan:

1. Launch app and verify WebSocket connects (check "Live" indicator in fee panel)
2. Search for a real transaction ID and Bitcoin address
3. Toggle between Blocks/Mempool views multiple times
4. Leave app running for 10+ minutes to check for memory leaks
5. Test with poor network connectivity to verify reconnection logic

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TD
    MempoolService["MempoolService.swift"]:::major-edit
    BlockchainViewModel["BlockchainViewModel.swift"]:::major-edit
    BlockchainImmersiveView["BlockchainImmersiveView.swift"]:::major-edit
    
    MempoolStrata["MempoolStrata.swift"]:::minor-edit
    RecommendedFees["RecommendedFees.swift"]:::minor-edit
    FeePanelView["FeePanelView.swift"]:::minor-edit
    SearchPanelView["SearchPanelView.swift"]:::minor-edit
    TransactionImmersiveView["TransactionImmersiveView.swift"]:::minor-edit
    MempoolView["MempoolView.swift"]:::minor-edit
    
    WebSocketAPI["mempool.space<br/>WebSocket API"]:::context
    
    MempoolService -->|"Real-time data"| BlockchainViewModel
    MempoolService -->|"WebSocket connection"| WebSocketAPI
    BlockchainViewModel -->|"Published properties"| BlockchainImmersiveView
    BlockchainImmersiveView -->|"Overlay UI"| FeePanelView
    BlockchainImmersiveView -->|"Overlay UI"| SearchPanelView
    MempoolStrata -->|"Data model"| MempoolService
    RecommendedFees -->|"Data model"| MempoolService
    
    subgraph Legend
        L1["Major Edit"]:::major-edit
        L2["Minor Edit"]:::minor-edit  
        L3["Context/No Edit"]:::context
    end
    
    classDef major-edit fill:#90EE90
    classDef minor-edit fill:#87CEEB
    classDef context fill:#FFFFFF

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Notes

• Session Details: Requested by Jeffrey (@jeffmarcilliat) - Devin Session
• Testing Limitation: Could not run local xcodebuild due to Linux environment - compilation verification needed
• WebSocket Implementation: Uses URLSessionWebSocketTask with automatic reconnection and JSON message parsing
• Threading Model: Combines WebSocket callbacks, DispatchQueue.main.async, and @mainactor - requires careful review for race conditions
• API Assumptions: Hardcoded mempool.space WebSocket endpoints and data format expectations that should be validated against actual API

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