import subprocess
import sys
import shlex
import os
from retrying import retry
from subprocess import CalledProcessError
from sagemaker_inference import model_server


def _retry_if_error(exception):
    return isinstance(exception, CalledProcessError or OSError)


@retry(stop_max_delay=1000 * 50, retry_on_exception=_retry_if_error)
def _start_mms():
    # by default the number of workers per model is 1, but we can configure it through the
    # environment variable below if desired.
    os.environ['SAGEMAKER_MODEL_SERVER_WORKERS'] = '2'
    model_server.start_model_server(
        handler_service="/home/model-server/model_handler.py:handle"
    )


def main():
    if sys.argv[1] == "serve":
        _start_mms()
    else:
        subprocess.check_call(shlex.split(" ".join(sys.argv[1:])))

    # prevent docker exit
    subprocess.call(["tail", "-f", "/dev/null"])


main()