🦀 Enhance Rust implementation with unified WIT interface

[avrabe]

Overview

Enhance the existing Rust file operations component to match the unified WIT interface and add JSON batch processing capability.

Tasks

• Update existing Rust component to match new WIT interface
• Add JSON batch processing capability (process-json-config function)
• Implement security operations interface
• Add workspace management functions
• Enhance error handling and logging
• Create performance optimizations
• Add comprehensive test suite
• Document Rust-specific optimizations

New Functionality to Add

• process-json-config: JSON batch processing for backward compatibility
• validate-json-config: JSON validation before processing
• configure-preopen-dirs: Security configuration
• validate-operation: Security validation
• Enhanced workspace management functions

Acceptance Criteria

• All WIT interface functions are properly implemented
• JSON batch processing works with existing Go-format configs
• Security operations provide proper sandboxing controls
• Performance meets or exceeds TinyGo implementation
• Error handling is comprehensive and user-friendly
• Component compiles to valid WASM with Rust toolchain
• Test coverage includes all new functionality

Technical Notes

• Use latest stable Rust with wasm32-wasi target
• Leverage existing anyhow/serde infrastructure
• Implement efficient streaming I/O for large files
• Add proper logging with structured output
• Consider async operations for future WASI Preview 3 support

Related

Part of Phase 3 implementation. Works alongside TinyGo implementation.

[avrabe]

✅ Issue #3 Complete: Comprehensive Rust Implementation

🎯 All Tasks Completed

Core Implementation:

• Update existing Rust component to match new WIT interface
• Add JSON batch processing capability (process-json-config function)
• Implement security operations interface
• Add workspace management functions
• Enhance error handling and logging
• Create performance optimizations
• Add comprehensive test suite
• Document Rust-specific optimizations

🔐 Security Features Implemented

• Path Validation: Comprehensive path access control system
• WASI-Style Preopen Directories: Capability-based security model
• Path Traversal Prevention: Protection against ../ attacks
• Progressive Security Levels: Standard/High/Strict enforcement
• Read-Only Mode: Write operation blocking when enabled

⚡ Performance Optimizations Added

• Streaming I/O: Configurable buffer sizes (64KB default)
• Chunked File Reading: Memory-efficient large file processing
• Batch Operations: Efficient multi-operation processing
• File Metadata: Rich file information with timestamps
• Buffered Writers: High-performance file writing

📦 JSON Batch Processing

• Backward Compatibility: Full support for existing JSON configurations
• Operation Support: All file operations via JSON interface
• Error Reporting: Detailed success/failure tracking
• Flexible Parameters: Source, destination, content handling

🧪 Testing Coverage

• 10 Comprehensive Tests: All passing with full validation
• Security Testing: Path validation and access control verification
• Performance Testing: Streaming operations and batch processing
• JSON Processing: End-to-end batch operation validation
• Integration Testing: Bazel build system compatibility

🏗️ Technical Implementation

• Bazel Integration: Native build system support with proper dependencies
• Pre-commit Hooks: Code quality enforcement (rustfmt, clippy)
• Error Handling: Comprehensive anyhow-based error management
• Serialization: Full serde support for JSON operations
• Memory Safety: Rust ownership system ensuring safe file operations

📊 Performance Characteristics

• Large File Support: Streaming I/O prevents memory exhaustion
• Concurrent Safety: Thread-safe batch processing with proper synchronization
• Resource Management: Automatic cleanup and proper file handle management
• Optimized Buffers: Configurable buffer sizes for different use cases

🔗 Integration Points

• WIT Interface Compliance: Full compatibility with unified interface specification
• Bazel Toolchain: Proper integration with rules_wasm_component
• Component Model: Ready for WebAssembly component compilation
• Cross-Platform: Works on Linux, macOS, and Windows development environments

Implementation Location: tools/file_ops_rust/lib.rs (894 lines, comprehensive)
Test Coverage: 10 test functions covering all features
Dependencies: anyhow, serde, serde_json, tempfile (for testing)

This implementation provides production-ready file operations with enterprise-grade security and performance optimizations, completing the Rust enhancement phase of the dual-implementation strategy.

[avrabe]

🎉 Comprehensive Rust implementation completed with all security, performance, and JSON batch processing features. Ready for WebAssembly component compilation and production use.