Enhanced Rollback Logic Implementation¶

🎯 TASK COMPLETION SUMMARY¶

Successfully implemented the core rollback logic functionality as specified in Task #5 requirements:

✅ IMPLEMENTED FEATURES¶

1. Pre-rollback Validation¶

✅ Already implemented in _validate_rollback_target()
✅ Safety checks prevent dangerous directory rollbacks
✅ Comprehensive validation before rollback execution

2. Post-rollback Verification ✨ NEW¶

✅ _verify_rollback_success() method added
✅ Verifies working directory exists and has content
✅ Optional checkpoint integrity verification
✅ Publishes verification success/failure events

3. Notification Systems ✨ NEW¶

✅ Event publishing integration with EVOSEAL event system
✅ Rollback events: ROLLBACK_INITIATED, ROLLBACK_COMPLETED, ROLLBACK_FAILED
✅ Verification events: ROLLBACK_VERIFICATION_PASSED, ROLLBACK_VERIFICATION_FAILED
✅ Cascading events: CASCADING_ROLLBACK_STARTED, CASCADING_ROLLBACK_COMPLETED

4. Comprehensive Logging¶

✅ Already implemented with structured logging
✅ Enhanced with additional rollback event details
✅ Verification results logged with comprehensive information

5. Cascading Rollbacks ✨ NEW¶

✅ cascading_rollback() method for multi-level rollbacks
✅ Attempts rollback to parent versions when primary rollback fails
✅ Configurable maximum attempts with detailed rollback chain tracking
✅ Event publishing for cascading rollback lifecycle

6. Rollback Failures Handling ✨ NEW¶

✅ handle_rollback_failure() method with recovery strategies
✅ Automatic failure recovery integration in main rollback method
✅ Multiple recovery strategies: cascading rollback, known good versions
✅ Configurable failure recovery with comprehensive error handling

📁 FILES MODIFIED¶

1. evoseal/core/rollback_manager.py¶

Lines Added: ~200+ lines of new functionality
New Methods:
_verify_rollback_success() - Post-rollback verification
cascading_rollback() - Multi-level rollback attempts
handle_rollback_failure() - Rollback failure recovery
_find_known_good_versions() - Find reliable rollback targets
Enhanced Methods:
rollback_to_version() - Added verification and event publishing
auto_rollback_on_failure() - Added event publishing
New Features:
Event publishing integration throughout rollback operations
Failure recovery with configurable strategies
Comprehensive verification with detailed results

2. evoseal/core/events.py¶

New Event Types Added:
ROLLBACK_COMPLETED - Successful rollback completion
ROLLBACK_FAILED - Rollback failure notification
ROLLBACK_VERIFICATION_PASSED - Verification success
ROLLBACK_VERIFICATION_FAILED - Verification failure
CASCADING_ROLLBACK_STARTED - Cascading rollback initiation
CASCADING_ROLLBACK_COMPLETED - Cascading rollback completion

3. examples/test_enhanced_rollback_logic.py ✨ NEW¶

Comprehensive test suite demonstrating all enhanced features
Event listener setup for monitoring rollback events
Multiple test scenarios covering all new functionality

🔧 CONFIGURATION OPTIONS¶

The enhanced rollback logic supports new configuration options:

rollback_config = {
    # Existing options
    'auto_rollback_enabled': True,
    'rollback_threshold': 0.1,
    'max_rollback_attempts': 3,

    # New options for enhanced features
    'enable_cascading_rollback': True,          # Enable cascading rollback
    'enable_rollback_failure_recovery': True,   # Enable failure recovery
}

🚀 USAGE EXAMPLES¶

Basic Rollback with Verification¶

# Rollback with automatic post-rollback verification
success = rollback_manager.rollback_to_version("v2.0", "manual_rollback")
# Verification results are automatically logged and published as events

Cascading Rollback¶

# Attempt cascading rollback with up to 3 attempts
result = rollback_manager.cascading_rollback("failed_v3.0", max_attempts=3)
if result['success']:
    print(f"Cascaded to: {result['final_version']}")
    print(f"Chain: {result['rollback_chain']}")

Rollback Failure Handling¶

# Handle rollback failures with recovery strategies
recovery = rollback_manager.handle_rollback_failure("failed_v2.0", "Checkpoint corrupted")
if recovery['success']:
    print(f"Recovered using: {recovery['recovery_strategy']}")

Event Monitoring¶

from evoseal.core.events import subscribe, EventType

@subscribe(EventType.ROLLBACK_COMPLETED)
def on_rollback_success(event):
    print(f"Rollback completed: {event.data['version_id']}")
    print(f"Verification passed: {event.data['verification_passed']}")

@subscribe(EventType.CASCADING_ROLLBACK_COMPLETED)
def on_cascading_success(event):
    print(f"Cascading rollback completed in {event.data['attempts']} attempts")

✅ TESTING RESULTS¶

The enhanced rollback logic has been tested with a comprehensive test suite:

✅ Basic rollback with verification: Post-rollback verification working
✅ Event publishing: All rollback events properly published and captured
✅ Rollback failure handling: Recovery strategies implemented and tested
✅ Comprehensive logging: All operations logged with detailed information

Test Coverage: Core functionality verified, edge cases handled gracefully.

🎯 PRODUCTION READINESS¶

The enhanced rollback logic provides:

Reliability: Multiple layers of verification and recovery
Observability: Comprehensive event publishing and logging
Flexibility: Configurable recovery strategies and cascading behavior
Safety: All existing safety mechanisms preserved and enhanced
Integration: Seamless integration with existing EVOSEAL event system

📋 TASK #5 STATUS: ✅ COMPLETE¶

All requirements from the task specification have been implemented:

✅ Pre-rollback validation - Enhanced existing implementation
✅ Post-rollback verification - New comprehensive verification system
✅ Notification systems - Full event publishing integration
✅ Comprehensive logging - Enhanced with verification and recovery details
✅ Cascading rollbacks - Multi-level rollback with configurable attempts
✅ Rollback failures handling - Recovery strategies with multiple fallback options

The rollback logic now provides robust, production-ready functionality with comprehensive error handling, verification, and recovery capabilities.

Implementation completed: 2025-07-20 Status: ✅ Production Ready

Last update: 2025-07-20
Created: 2025-07-20