import os
import pymysql


def _params() -> dict:
    return {
        "host": os.environ["MYSQL_HOST"],
        "port": int(os.environ.get("MYSQL_PORT", 3306)),
        "user": os.environ["MYSQL_USER"],
        "password": os.environ["MYSQL_PASSWORD"],
        "database": os.environ["MYSQL_DATABASE"],
        "connect_timeout": 3,
    }


def check_db() -> bool:
    try:
        conn = pymysql.connect(**_params())
        conn.close()
        return True
    except Exception:
        return False