patroni/tests/test_aws.py

import unittest
import requests
import boto.ec2
from collections import namedtuple
from patroni.scripts.aws import AWSConnection
from requests.exceptions import RequestException


class MockEc2Connection:

    def __init__(self, error=False):
        self.error = error

    def get_all_volumes(self, filters):
        if self.error:
            raise Exception("get_all_volumes")
        oid = namedtuple('Volume', 'id')
        return [oid(id='a'), oid(id='b')]

    def create_tags(self, objects, tags):
        if self.error or len(objects) == 0:
            raise Exception("create_tags")
        return True


class MockResponse:

    def __init__(self, content):
        self.content = content
        self.ok = True

    def json(self):
        return self.content


class TestAWSConnection(unittest.TestCase):

    def __init__(self, method_name='runTest'):
        super(TestAWSConnection, self).__init__(method_name)

    def set_error(self):
        self.error = True

    def set_json_error(self):
        self.json_error = True

    def boto_ec2_connect_to_region(self, region):
        return MockEc2Connection(self.error)

    def requests_get(self, url, **kwargs):
        if self.error:
            raise RequestException("foo")
        result = namedtuple('Request', 'ok content')
        result.ok = True
        if url.split('/')[-1] == 'document' and not self.json_error:
            result = {"instanceId": "012345", "region": "eu-west-1"}
        else:
            result = 'foo'
        return MockResponse(result)

    def setUp(self):
        self.error = False
        self.json_error = False
        requests.get = self.requests_get
        boto.ec2.connect_to_region = self.boto_ec2_connect_to_region
        self.conn = AWSConnection('test')

    def test_aws_available(self):
        self.assertTrue(self.conn.aws_available())

    def test_on_role_change(self):
        self.assertTrue(self.conn._tag_ebs('master'))
        self.assertTrue(self.conn._tag_ec2('master'))
        self.assertTrue(self.conn.on_role_change('master'))

    def test_non_aws(self):
        self.set_error()
        conn = AWSConnection('test')
        self.assertFalse(conn.aws_available())
        self.assertFalse(conn._tag_ebs('master'))
        self.assertFalse(conn._tag_ec2('master'))

    def test_aws_bizare_response(self):
        self.set_json_error()
        conn = AWSConnection('test')
        self.assertFalse(conn.aws_available())

    def test_aws_tag_ebs_error(self):
        self.set_error()
        self.assertFalse(self.conn._tag_ebs("master"))

    def test_aws_tag_ec2_error(self):
        self.set_error()
        self.assertFalse(self.conn._tag_ec2("master"))