Frontmatter MCP

"""Dependency injection for FastMCP tools. This module provides singleton-cached dependencies for use with FastMCP's Depends system. Each dependency is instantiated once on first use and cached for the lifetime of the application. """ from frontmatter_mcp.files import FileRecordCache from frontmatter_mcp.semantic import SemanticContext, get_semantic_context from frontmatter_mcp.settings import Settings from frontmatter_mcp.settings import get_settings as _get_settings # Singleton caches _settings_cache: Settings | None = None _semantic_ctx_cache: SemanticContext | None = None _file_record_cache_instance: FileRecordCache | None = None def get_settings() -> Settings: """Get application settings (singleton).""" global _settings_cache if _settings_cache is None: _settings_cache = _get_settings() return _settings_cache def get_file_record_cache() -> FileRecordCache: """Get file record cache (singleton).""" global _file_record_cache_instance if _file_record_cache_instance is None: _file_record_cache_instance = FileRecordCache() return _file_record_cache_instance def get_semantic_ctx() -> SemanticContext | None: """Get semantic context if enabled (singleton). Returns None if semantic search is disabled. """ global _semantic_ctx_cache settings = get_settings() if not settings.enable_semantic: return None if _semantic_ctx_cache is None: _semantic_ctx_cache = get_semantic_context(settings) return _semantic_ctx_cache def reset_caches() -> None: """Reset all singleton caches. Useful for testing.""" global _settings_cache, _semantic_ctx_cache, _file_record_cache_instance _settings_cache = None _semantic_ctx_cache = None _file_record_cache_instance = None