hello.py

#!/usr/bin/env python3
"""PyMigrate - Data Migration Framework Demo."""

import asyncio
from datetime import datetime

from pymigrate import (
    SyncEngine,
    ServiceBoundaryAnalyzer,
    APIGenerator,
    ConsistencyValidator,
    TrafficRouter,
)
from pymigrate.models.config import (
    DatabaseConfig,
    DatabaseType,
    SyncConfig,
    ConflictResolutionStrategy,
    ServiceConfig,
)
from pymigrate.models.service import RouteConfig, RoutingStrategy


async def main():
    """Demo PyMigrate functionality."""
    print("=" * 60)
    print("PyMigrate - Microservices Migration Framework")
    print("=" * 60)
    print()
    
    # Demo configuration
    source_db_config = DatabaseConfig(
        type=DatabaseType.POSTGRESQL,
        host="localhost",
        port=5432,
        database="monolith_db",
        username="user",
        password="password",
    )
    
    target_db_config = DatabaseConfig(
        type=DatabaseType.POSTGRESQL,
        host="localhost",
        port=5433,
        database="microservice_db",
        username="user",
        password="password",
    )
    
    # 1. Bi-directional Sync Engine Demo
    print("1. Bi-directional Sync Engine")
    print("-" * 30)
    
    sync_config = SyncConfig(
        source_db=source_db_config,
        target_db=target_db_config,
        conflict_resolution=ConflictResolutionStrategy.LAST_WRITE_WINS,
        sync_interval_ms=100,
        batch_size=1000,
    )
    
    sync_engine = SyncEngine(sync_config)
    print(f"✓ Sync engine configured with {sync_config.conflict_resolution} strategy")
    print(f"✓ Sync interval: {sync_config.sync_interval_ms}ms")
    print(f"✓ Batch size: {sync_config.batch_size}")
    print()
    
    # 2. Service Boundary Analyzer Demo
    print("2. Service Boundary Analyzer")
    print("-" * 30)
    
    # Note: In a real scenario, this would connect to actual database
    print("✓ Would analyze database schema and access patterns")
    print("✓ Would identify service boundaries based on:")
    print("  - Table relationships and foreign keys")
    print("  - Access patterns from query logs")
    print("  - Transaction boundaries")
    print("✓ Would recommend microservice decomposition")
    print()
    
    # 3. API Generator Demo
    print("3. API Generator")
    print("-" * 30)
    print("✓ Would generate RESTful APIs for each microservice")
    print("✓ Would create OpenAPI specifications")
    print("✓ Would generate FastAPI code with:")
    print("  - CRUD endpoints")
    print("  - Pagination support")
    print("  - Authentication")
    print("  - Request/response validation")
    print()
    
    # 4. Consistency Validator Demo
    print("4. Consistency Validator")
    print("-" * 30)
    
    consistency_validator = ConsistencyValidator(
        source_conn=None,  # Would be actual connection
        target_conn=None,  # Would be actual connection
    )
    
    print("✓ Would continuously validate data consistency")
    print("✓ Would detect discrepancies:")
    print("  - Count mismatches")
    print("  - Checksum differences")
    print("  - Missing records")
    print("✓ Would support automatic reconciliation")
    print()
    
    # 5. Traffic Router Demo
    print("5. Traffic Router")
    print("-" * 30)
    
    traffic_router = TrafficRouter()
    
    # Demo route configuration
    user_service_route = RouteConfig(
        service_name="user_service",
        strategy=RoutingStrategy.PERCENTAGE,
        percentage=25.0,
        sticky_sessions=True,
        health_check_interval_ms=5000,
        rollback_enabled=True,
    )
    
    user_service_config = ServiceConfig(
        name="user_service",
        version="1.0.0",
        base_url="https://api.example.com/user",
        health_check_path="/health",
        timeout=30,
    )
    
    print(f"✓ Traffic routing configured for {user_service_route.service_name}")
    print(f"✓ Strategy: {user_service_route.strategy}")
    print(f"✓ Initial traffic: {user_service_route.percentage}%")
    print(f"✓ Sticky sessions: {user_service_route.sticky_sessions}")
    print(f"✓ Rollback enabled: {user_service_route.rollback_enabled}")
    print()
    
    # Demo request routing
    print("Demo: Routing sample requests")
    print("-" * 30)
    
    # Simulate routing decisions
    for i in range(5):
        request_id = f"req_{i+1}"
        user_id = f"user_{i+1}"
        
        # In real implementation, this would route actual requests
        destination = "microservice" if i < 1 else "monolith"
        print(f"Request {request_id} (user: {user_id}) → {destination}")
    
    print()
    print("=" * 60)
    print("PyMigrate is ready for microservices migration!")
    print("=" * 60)


if __name__ == "__main__":
    asyncio.run(main())