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import logging from typing import Any from .notifications import CancelledNotification from .validation import validate_cancelled_notification logger = logging.getLogger(__name__) def notification_validator_middleware( message: dict[str, Any], ) -> CancelledNotification | None: """ A middleware that validates incoming notifications. It specifically looks for and validates "notifications/cancelled". Other notifications are passed through (by returning None). """ if message.get("method") == "notifications/cancelled": try: validated_notification = validate_cancelled_notification(message) logger.info( "Validated CancelledNotification for requestId: " f"{validated_notification.params.requestId}" ) return validated_notification except ValueError as e: logger.error(f"Failed to validate CancelledNotification: {e}") # In a real server, you might drop the message or send an error response # For this middleware, we'll just log and return None. return None return None