Comprehensive comparison for Database technology in Software Development applications

import boto3
import json
from gremlin_python.driver import client, serializer
from gremlin_python.driver.protocol import GremlinServerError
import logging
from typing import Dict, List, Optional
from datetime import datetime

logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)

class SoftwareDependencyGraphService:
    """
    Production service for managing software package dependencies in Neptune.
    Tracks packages, versions, and their dependency relationships.
    """
    
    def __init__(self, neptune_endpoint: str, port: int = 8182):
        self.endpoint = f"wss://{neptune_endpoint}:{port}/gremlin"
        self.client = client.Client(
            self.endpoint,
            'g',
            message_serializer=serializer.GraphSONSerializersV2d0()
        )
    
    def add_package_version(self, package_name: str, version: str, 
                           metadata: Dict) -> Optional[Dict]:
        """
        Add a new package version to the dependency graph.
        """
        try:
            query = (
                "g.V().has('package', 'name', packageName)"
                ".fold()"
                ".coalesce("
                "  unfold(),"
                "  addV('package').property('name', packageName)"
                ")"
                ".as('pkg')"
                ".V().has('version', 'versionId', versionId)"
                ".fold()"
                ".coalesce("
                "  unfold(),"
                "  addV('version')"
                "    .property('versionId', versionId)"
                "    .property('number', versionNum)"
                "    .property('createdAt', createdAt)"
                "    .property('author', author)"
                ")"
                ".as('ver')"
                ".V().has('package', 'name', packageName)"
                ".addE('hasVersion').to('ver')"
                ".select('ver')"
                ".elementMap()"
            )
            
            bindings = {
                'packageName': package_name,
                'versionId': f"{package_name}@{version}",
                'versionNum': version,
                'createdAt': metadata.get('created_at', datetime.utcnow().isoformat()),
                'author': metadata.get('author', 'unknown')
            }
            
            result = self.client.submit(query, bindings).all().result()
            logger.info(f"Added package version: {package_name}@{version}")
            return result[0] if result else None
            
        except GremlinServerError as e:
            logger.error(f"Neptune error adding package: {str(e)}")
            raise
        except Exception as e:
            logger.error(f"Unexpected error: {str(e)}")
            return None
    
    def add_dependency(self, package: str, version: str, 
                      depends_on_package: str, depends_on_version: str,
                      dependency_type: str = 'runtime') -> bool:
        """
        Create a dependency relationship between two package versions.
        """
        try:
            query = (
                "g.V().has('version', 'versionId', sourceId)"
                ".as('source')"
                ".V().has('version', 'versionId', targetId)"
                ".as('target')"
                ".select('source')"
                ".addE('dependsOn')"
                "  .to('target')"
                "  .property('type', depType)"
                "  .property('createdAt', createdAt)"
            )
            
            bindings = {
                'sourceId': f"{package}@{version}",
                'targetId': f"{depends_on_package}@{depends_on_version}",
                'depType': dependency_type,
                'createdAt': datetime.utcnow().isoformat()
            }
            
            self.client.submit(query, bindings).all().result()
            logger.info(f"Added dependency: {package}@{version} -> {depends_on_package}@{depends_on_version}")
            return True
            
        except GremlinServerError as e:
            logger.error(f"Neptune error adding dependency: {str(e)}")
            return False
    
    def get_dependency_tree(self, package: str, version: str, 
                           max_depth: int = 5) -> List[Dict]:
        """
        Retrieve the complete dependency tree for a package version.
        Uses repeat/until for traversal with depth limiting.
        """
        try:
            query = (
                "g.V().has('version', 'versionId', versionId)"
                ".repeat("
                "  out('dependsOn').simplePath()"
                ").times(maxDepth)"
                ".path()"
                ".by(elementMap())"
                ".limit(1000)"
            )
            
            bindings = {
                'versionId': f"{package}@{version}",
                'maxDepth': max_depth
            }
            
            result = self.client.submit(query, bindings).all().result()
            logger.info(f"Retrieved dependency tree for {package}@{version}")
            return result
            
        except GremlinServerError as e:
            logger.error(f"Neptune error retrieving dependencies: {str(e)}")
            return []
    
    def find_circular_dependencies(self, package: str) -> List[List[str]]:
        """
        Detect circular dependency chains for a given package.
        """
        try:
            query = (
                "g.V().has('package', 'name', packageName)"
                ".out('hasVersion')"
                ".as('start')"
                ".repeat(out('dependsOn'))"
                ".until(where(eq('start')))"
                ".path()"
                ".by('versionId')"
                ".limit(100)"
            )
            
            bindings = {'packageName': package}
            result = self.client.submit(query, bindings).all().result()
            
            if result:
                logger.warning(f"Circular dependencies found for {package}")
            return result
            
        except GremlinServerError as e:
            logger.error(f"Neptune error checking circular dependencies: {str(e)}")
            return []
    
    def close(self):
        """Clean up Neptune client connection."""
        if self.client:
            self.client.close()
            logger.info("Neptune client connection closed")