GitDreamNodeService Implementation

[ProjectLiminality]

Overview

Create the real git-backed implementation of the DreamNodeService interface with persistent caching.

Key Components

• Implement create/update/delete/list operations
• Repository initialization with template from plugin directory
• Metadata file management (udd.json at repo root)
• Persistent registry using Zustand persist middleware
• Error handling and git operation safety

Implementation Details

Repository Management

• Location: All DreamNodes created at Obsidian vault root
• Template: Located in plugin directory, accessed via symbolic link path
• Metadata: Single udd.json file at repo root (updated from .udd/metadata.json)
• Git Template Command: git init --template=pluginPath/DreamNode-template

Performance Strategy (Git Client Pattern)

Persistent store for known repo locations with fast validation-based list() operation.

Service Interface Implementation

class GitDreamNodeService implements DreamNodeService {
  private pluginPath: string;
  private vaultPath: string;

  constructor(plugin: Plugin) {
    this.pluginPath = plugin.app.vault.adapter.basePath + '/.obsidian/plugins/interbrain';
    this.vaultPath = plugin.app.vault.adapter.basePath;
  }

  async create(title: string, type: NodeType, dreamTalk?: File): Promise<DreamNode>
  async update(id: string, changes: Partial<DreamNode>): Promise<void>
  async delete(id: string): Promise<void>  
  async list(): Promise<DreamNode[]>
}

Error Handling Strategy

• Template Failure: Fall back to regular git init with warning message
• Repository Exists: Skip creation, return existing DreamNode
• Missing Repos: Remove from registry, log warning
• Git Operation Failures: Surface meaningful errors to user
• File System Errors: Graceful degradation with user notification

Data Format Compatibility

• Maintain same DreamNode interface as MockDreamNodeService
• Enable seamless switching between mock and git implementations
• Preserve Zustand store structure and patterns

Acceptance Criteria

• Analysis complete and implementation plan detailed
• GitDreamNodeService implements full DreamNodeService interface
• Create operation initializes git repo with plugin template
• Update operation modifies udd.json and integrates with auto-stash
• Delete operation safely removes repository and registry entry
• List operation uses persistent registry for performance
• Persistent registry maintains known DreamNode locations
• Comprehensive error handling for all git operations
• Compatible data format with MockDreamNodeService
• Template path correctly resolves to plugin directory
• Background validation keeps registry clean

Implementation Complete ✅

What Was Built

• Complete GitDreamNodeService: Full interface implementation with Zustand persistence
• Git Template System Integration: Uses DreamNode-template with pre-commit hooks
• Mock/Real Mode Toggle: Seamless switching via command palette
• Vault Scanning: Auto-discovery of existing DreamNodes on startup
• File Operations: Multi-file support with proper media handling
• Repository Creation: Git repos with proper .udd metadata files
• Change Detection: SHA256 file hashing for sync validation
• Error Handling: Robust error handling with fallbacks

Key Features Delivered

• ✅ Unified Store Pattern: Both mock and real modes use same Zustand persistence
• ✅ Snappy UI: Store updates immediately, git operations run in parallel
• ✅ File Preservation: Ctrl+drag maintains all dropped files in proto-node creation
• ✅ Capitalization Preserved: Repository names maintain original case
• ✅ Complete Template System: Pre-commit hooks move .git/udd to .udd
• ✅ Multi-file Support: Handle dreamTalk media + additional files
• ✅ Development Toggle: "Switch to Mock/Real Data" commands
• ✅ Cross-session Persistence: Real data persists across plugin reloads

Technical Achievements

• Node.js fs API integration (avoids Obsidian Vault API limitations)
• Shell command execution for git operations
• Template placeholder replacement system
• File hash-based change detection
• Robust path detection with fallbacks
• Clean lint/typecheck/test validation (98 tests passing)

Technical Dependencies

• Zustand persist middleware for registry caching
• Plugin directory access for git template location
• Node.js fs API for file system operations
• Shell git commands for repository operations
• Feature Git Template System for DreamNode Creation #309 Git Template System (completed)

Integration Points

• Will integrate with Feature Service Layer Integration with UI #312 (Service Layer Integration)
• Supports Feature Auto-stash Workflow for Continuous Saving #310 (Auto-stash Workflow)
• Enables Feature Development Mode Toggle System #313 (Development Mode Toggle)

Epic Context

Part of Epic 3 Phase B: Git Operations via Service Layer - Core foundation for real git-backed DreamNode operations.

[ProjectLiminality]

Feature implementation complete and merged to epic branch.

✅ GitDreamNodeService Implementation Complete

What Was Delivered

• Complete GitDreamNodeService with full DreamNodeService interface
• Mock/real data mode toggle with command palette commands
• Zustand persistence for cross-session real data storage
• Git template system integration with proper .udd metadata
• Multi-file support (dreamTalk + additional files)
• Vault scanning for existing DreamNode discovery
• File change detection via SHA256 hashing
• Repository creation with proper capitalization preservation

Technical Quality

• Clean lint/typecheck/test validation (98 tests passing)
• Comprehensive error handling with robust fallbacks
• Node.js fs API integration for vault operations
• Shell command execution for git operations
• Unified store pattern for snappy UI performance

Integration Success

• Seamless switching between mock and real data modes
• File preservation in Ctrl+drag proto-node creation workflows
• Complete compatibility with existing Epic 3 architecture
• Ready for remaining Epic 3 features to build upon

Feature ready for next development session from clean epic branch state.