Module restore_file 

File Restoration Module

This module provides comprehensive file restoration capabilities for the adaptive pipeline system. It handles the creation and execution of restoration pipelines that reverse the processing operations applied to files, restoring them from the .adapipe binary format back to their original state.

Overview

The restoration module implements the inverse operations of the processing pipeline:

• Metadata Analysis: Parses .adapipe file headers to understand processing history
• Pipeline Reconstruction: Creates restoration pipelines that reverse original processing
• Stage Reversal: Applies processing stages in reverse order (LIFO)
• Integrity Validation: Verifies checksums and data integrity during restoration
• Error Recovery: Handles restoration failures and provides detailed error reporting

Architecture

The restoration system follows Domain-Driven Design principles:

• Domain Entities: Pipeline serves as the aggregate root for restoration operations
• Value Objects: Type-safe identifiers (PipelineId, StageId) ensure correctness
• Immutability: Restoration pipelines are immutable once created
• Error Handling: Comprehensive validation and error propagation throughout
• Separation of Concerns: Restoration logic is isolated from main application logic

Restoration Process

1. Metadata Parsing

The restoration process begins by parsing the .adapipe file header to extract:

• Original processing pipeline configuration
• Processing steps and their parameters
• Checksums for integrity validation
• File metadata and compression information

2. Pipeline Creation

An ephemeral restoration pipeline is created that:

• Reverses the original processing order (LIFO)
• Configures inverse operations for each stage
• Includes checksum validation stages
• Maintains processing context and metadata

3. Stage Execution

Processing stages are executed in reverse order:

• Decompression: Reverses compression operations
• Decryption: Reverses encryption operations
• Validation: Verifies checksums and data integrity
• Output: Writes restored file to target location

Usage Examples

Basic File Restoration

Batch Restoration

Advanced Restoration with Validation

Error Handling

The restoration module provides comprehensive error handling for:

• Metadata Parsing Errors: Invalid or corrupted .adapipe headers
• Pipeline Creation Errors: Invalid processing steps or configurations
• Stage Configuration Errors: Unsupported algorithms or parameters
• Validation Errors: Checksum mismatches or data corruption
• I/O Errors: File access, permission, or disk space issues

Performance Considerations

• Memory Usage: Restoration pipelines are lightweight and ephemeral
• Processing Order: LIFO stage execution ensures correct restoration sequence
• Streaming: Large files are processed in chunks to minimize memory usage
• Validation: Checksum validation provides integrity guarantees with minimal overhead

Security Considerations

• Decryption: Encrypted files require appropriate decryption keys
• Integrity: Checksum validation ensures data hasn’t been tampered with
• Permissions: Restored files maintain appropriate access permissions
• Audit Trail: Restoration operations are logged for security auditing

Integration

The restoration module integrates with:

• CLI Interface: Command-line restoration operations
• Pipeline System: Core pipeline execution engine
• File I/O Services: Reading .adapipe files and writing restored files
• Validation Services: Checksum verification and integrity checking
• Logging System: Comprehensive operation logging and error reporting

Functions

create_restoration_pipeline

Creates an ephemeral restoration pipeline from .adapipe file metadata.