"""S3 connector."""
import boto3
from botocore.config import Config

def invoke_lambda(function_name: str, payload: str) -> str:
    """Invoke a Lambda function."""
    lambda_client = boto3.client('lambda', config=Config(
        read_timeout=1000,
    ))
    response = lambda_client.invoke(
        FunctionName=function_name,
        InvocationType='RequestResponse',
        Payload=payload
    )
    return response['Payload'].read().decode('utf-8')