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Retrieves the UID of an existing AuditTrail node from a Neo4j database, or creates a new AuditTrail node with a generated UID if one doesn't exist.

Purpose

This function ensures that an AuditTrail node exists in the Neo4j database for tracking audit events. It implements a get-or-create pattern to maintain a singleton AuditTrail node. The function first queries for an existing AuditTrail node, returns its UID if found, or creates a new one with a UUID and timestamp if not found. It includes error handling that falls back to generating a new UID even if database operations fail.

Source Code

def get_or_create_audit_trail_uid() -> str:
    """
    Get the UID of the AuditTrail node, creating it if it doesn't exist.
    
    Returns:
        str: UID of the AuditTrail node
    """
    try:
        # Check if audit trail exists
        result = db.run_query(
            """
            MATCH (t:AuditTrail)
            RETURN t.UID as uid
            LIMIT 1
            """
        )
        
        # If we found an existing audit trail node, return its UID
        if result and len(result) > 0 and 'uid' in result[0]:
            return result[0]['uid']
        
        # No audit trail found, create a new one
        audit_trail_uid = str(uuid.uuid4())
        
        # Create the audit trail node
        db.create_node(NodeLabels.AUDIT_TRAIL, {
            "UID": audit_trail_uid,
            "createdDate": datetime.now()
        })
        
        logger.info(f"Created new AuditTrail node with UID {audit_trail_uid}")
        return audit_trail_uid
        
    except Exception as e:
        logger.error(f"Error getting or creating audit trail: {e}")
        # Fallback to generating a new UID, even though the node creation might have failed
        return str(uuid.uuid4())

Return Value

Type: str

Returns a string containing the UID (Unique Identifier) of the AuditTrail node. This will be either the UID of an existing AuditTrail node found in the database, or a newly generated UUID v4 string if a new node was created or if an error occurred during database operations.

Dependencies

• uuid
• datetime
• logging
• typing
• json
• CDocs
• CDocs.db
• CDocs.config
• CDocs.db.schema_manager
• CDocs.models.user_extensions

Required Imports

import uuid
from datetime import datetime
import logging
from CDocs import db
from CDocs.db.schema_manager import NodeLabels

Usage Example

import logging
import uuid
from datetime import datetime
from CDocs import db
from CDocs.db.schema_manager import NodeLabels

# Ensure logger is configured
logger = logging.getLogger(__name__)

# Get or create the audit trail UID
audit_trail_uid = get_or_create_audit_trail_uid()
print(f"AuditTrail UID: {audit_trail_uid}")

# Use the UID for subsequent audit operations
# For example, linking audit events to this trail
db.create_relationship(
    audit_event_uid,
    audit_trail_uid,
    'BELONGS_TO_TRAIL'
)

Best Practices

• This function assumes a singleton pattern for AuditTrail nodes - only one should exist in the database
• The function includes error handling that returns a UUID even on failure, which may lead to orphaned audit data if the database operation fails
• Ensure the database connection is established before calling this function
• The logger instance must be defined in the module scope before calling this function
• Consider wrapping calls to this function in a try-except block for additional error handling in production environments
• The function uses LIMIT 1 in the query, assuming only one AuditTrail node should exist
• If multiple AuditTrail nodes exist in the database, only the first one found will be returned
• The createdDate property is set using datetime.now() which uses the server's local timezone

Tags

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