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microservices/token-service/database.py

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+"""
+Database connection for Token Service
+"""
+
+from motor.motor_asyncio import AsyncIOMotorClient, AsyncIOMotorDatabase
+import logging
+import os
+
+logger = logging.getLogger(__name__)
+
+# Database configuration
+MONGO_URL = os.getenv("MONGO_URL", "mongodb://localhost:27017")
+DATABASE_NAME = os.getenv("DATABASE_NAME", "energy_dashboard_tokens")
+
+# Global database client
+_client: AsyncIOMotorClient = None
+_database: AsyncIOMotorDatabase = None
+
+async def connect_to_mongo():
+    """Create database connection"""
+    global _client, _database
+    
+    try:
+        _client = AsyncIOMotorClient(MONGO_URL)
+        _database = _client[DATABASE_NAME]
+        
+        # Test connection
+        await _database.command("ping")
+        logger.info(f"Connected to MongoDB: {DATABASE_NAME}")
+        
+        # Create indexes for performance
+        await create_indexes()
+        
+    except Exception as e:
+        logger.error(f"Failed to connect to MongoDB: {e}")
+        raise
+
+async def close_mongo_connection():
+    """Close database connection"""
+    global _client
+    
+    if _client:
+        _client.close()
+        logger.info("Disconnected from MongoDB")
+
+async def get_database() -> AsyncIOMotorDatabase:
+    """Get database instance"""
+    global _database
+    
+    if _database is None:
+        raise RuntimeError("Database not initialized. Call connect_to_mongo() first.")
+    
+    return _database
+
+async def create_indexes():
+    """Create database indexes for performance"""
+    db = await get_database()
+    
+    # Indexes for tokens collection
+    await db.tokens.create_index("token", unique=True)
+    await db.tokens.create_index("active")
+    await db.tokens.create_index("expires_at")
+    await db.tokens.create_index("name")
+    
+    logger.info("Database indexes created")