Module SynchronizationProvider

Mountain::Environment

Module SynchronizationProvider 

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§SynchronizationProvider (Environment)

RESPONSIBILITIES:

  • Implements SynchronizationProvider for MountainEnvironment
  • Provides two-way synchronization of user data across devices
  • Handles push (local → remote) and pull (remote → local) operations
  • Manages sync state, conflict resolution, and offline queuing
  • Provides sync status notifications and progress tracking

ARCHITECTURAL ROLE:

  • Optional provider for cloud sync functionality (currently stub)
  • Would integrate with external sync service (Firebase, Supabase, custom backend)
  • Uses authentication from AuthenticationProvider (to be implemented)
  • Syncs multiple data types: settings, keybindings, workspaces, extensions, snippets
  • Store sync metadata in ApplicationState

SYNC ARCHITECTURE: PushUserData:

  • Upload local data snapshot to remote server
  • Compare versions to detect conflicts
  • Handle conflicts via configured strategy (latest wins, manual, merge)
  • Queue operations when offline for later retry
  • Update local state after successful push

PullUserData:

  • Download latest remote data snapshot
  • Compare with local version to detect conflicts
  • Apply changes or prompt for conflict resolution
  • Notify UI of sync completion via events

CONFLICT RESOLUTION:

  • Strategies: Latest Wins, Local Wins, Remote Wins, Manual Resolution, Merge
  • Version tracking using timestamps or incremental version numbers
  • Conflict UI would be handled by frontend (Sky) via notifications
  • TODO: Implement proper three-way merge for settings files

ERROR HANDLING:

  • Uses CommonError for all operations
  • Network failures should be queued for retry with exponential backoff
  • Authentication errors should trigger re-authentication flow
  • TODO: Implement proper error categorization and user messaging

PERFORMANCE:

  • Sync operations should be non-blocking and cancellable
  • Large data payloads should be compressed and chunked
  • Incremental sync to minimize data transfer (sync only deltas)
  • Throttling to respect rate limits and avoid network saturation

SECURITY:

  • All sync traffic must be encrypted (HTTPS/TLS)
  • Sensitive data (credentials, tokens) must be encrypted at rest on server
  • Device identification and authentication required
  • TODO: Implement end-to-end encryption for maximum security

VS CODE REFERENCE:

  • vs/workbench/services/settings/common/settingsSync.ts - settings sync service
  • vs/workbench/common/sync/syncService.ts - sync service abstraction
  • vs/workbench/services/settings/common/settingsTarget.ts - multi-device sync
  • vs/platform/update/common/update.ts - update pattern for comparison

TODO:

  • Implement complete sync service integration (Firebase, Supabase, custom)
  • Add authentication flow for sync service (OAuth, API keys)
  • Implement conflict detection and resolution strategies (version vectors)
  • Add offline queue with persistent storage for pending operations
  • Implement retry logic with exponential backoff and jitter
  • Support sync schedule configuration (manual, immediate, interval, on-wifi)
  • Add sync progress tracking and cancellation support
  • Implement selective sync based on user preferences (data type filters)
  • Support data versioning for rollback and audit trail
  • Add sync conflict UI for user resolution (frontend component)
  • Implement sync encryption for sensitive data (client-side encryption)
  • Support sync across multiple devices (device IDs, device management)
  • Add sync history and audit log (for compliance and debugging)
  • Implement sync migration and upgrade support (schema changes)
  • Support sync for workspaces and configurations (full workspace state)
  • Add sync for extensions and their data (extension state, settings)
  • Implement sync throttling to avoid rate limits (adaptive throttling)
  • Support sync for large files with chunking and resumable uploads
  • Add sync statistics and analytics (sync frequency, data volume, errors)
  • Implement sync health checks and monitoring (service status, connectivity)
  • Support sync service fallback and failover (multiple backend endpoints)

MODULE CONTENTS:

  • SynchronizationProvider implementation:
  • PushUserData - upload local data to remote (stub)
  • PullUserData - download remote data to local (stub)
  • Current state: Stub with logging only; production implementation pending

Implementation notes: This provider is currently a stub with no actual sync functionality. Future work will integrate with a cloud sync service provider.