"""
Model for Healthcheck.

This module contains functions to perform healthchecks on the DB.

"""

import os

import raven

from contracts.connectors import mysql


def check_db():
    """Perform a DB healthcheck.

    Returns:
        bool: True if db check passes, False otherwise.

    """
    sql = 'SELECT "hello"'

    try:
        with mysql.db_session() as session:
            rs = session.execute(sql)
            result = rs.fetchone()
        return len(result) > 0 and result[0] == 'hello'
    except Exception:
        if os.environ.get('SENTRY_DSN'):
            raven.Client().captureException()
        return False