# -*- coding: utf-8 -*-
# (c) 2015, Allen Sanabria <asanabria@linuxdynasty.org>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

import unittest
import botocore
import boto3

from ansible.module_utils.ec2 import AWSRetry

class RetryTestCase(unittest.TestCase):

    def test_no_failures(self):
        self.counter = 0

        @AWSRetry.backoff(tries=2, delay=0.1)
        def no_failures():
            self.counter += 1

        r = no_failures()
        self.assertEqual(self.counter, 1)

    def test_retry_once(self):
        self.counter = 0
        err_msg = {'Error': {'Code': 'InstanceId.NotFound'}}

        @AWSRetry.backoff(tries=2, delay=0.1)
        def retry_once():
            self.counter += 1
            if self.counter < 2:
                raise botocore.exceptions.ClientError(err_msg, 'Could not find you')
            else:
                return 'success'

        r = retry_once()
        self.assertEqual(r, 'success')
        self.assertEqual(self.counter, 2)

    def test_reached_limit(self):
        self.counter = 0
        err_msg = {'Error': {'Code': 'RequestLimitExceeded'}}

        @AWSRetry.backoff(tries=4, delay=0.1)
        def fail():
            self.counter += 1
            raise botocore.exceptions.ClientError(err_msg, 'toooo fast!!')

        #with self.assertRaises(botocore.exceptions.ClientError):
        try:
            fail()
        except Exception as e:
            self.assertEqual(e.response['Error']['Code'], 'RequestLimitExceeded')
        self.assertEqual(self.counter, 4)

    def test_unexpected_exception_does_not_retry(self):
        self.counter = 0
        err_msg = {'Error': {'Code': 'AuthFailure'}}

        @AWSRetry.backoff(tries=4, delay=0.1)
        def raise_unexpected_error():
            self.counter += 1
            raise botocore.exceptions.ClientError(err_msg, 'unexpected error')

        #with self.assertRaises(botocore.exceptions.ClientError):
        try:
            raise_unexpected_error()
        except Exception as e:
            self.assertEqual(e.response['Error']['Code'], 'AuthFailure')

        self.assertEqual(self.counter, 1)

if __name__ == '__main__':
    unittest.main()