handler.py

import json

class InputValidationError(Exception):
    pass

def validate_input(data):
    if not isinstance(data, dict):
        raise InputValidationError("Input must be a dictionary")
    if 'name' not in data or not isinstance(data['name'], str):
        raise InputValidationError("'name' field must be a string")
    if 'age' not in data or not isinstance(data['age'], int):
        raise InputValidationError("'age' field must be an integer")
    return True

def process_data(data):
    try:
        validate_input(data)
        # Simulate some processing
        return json.dumps({"status": "success", "data": data})
    except InputValidationError as e:
        return json.dumps({"status": "error", "message": str(e)})

if __name__ == '__main__':
    sample_input = {'name': 'John Doe', 'age': 30}
    result = process_data(sample_input)
    print(result)  
    invalid_input = {'name': 123, 'age': 'thirty'}
    result = process_data(invalid_input)
    print(result)