def cfn_output_converter(event, context):
"""
Convert an AWS CloudFormation output message to our defined
ResultMessage format.
"""
output_converter = OutputConverter(event, context)
output_converter.convert()
class TestOutputConverter(unittest.TestCase):
"""
Tests for OutputConverter.
"""
def setUp(self):
self.event = cfn_event
self.context = {}
self.output_converter = OutputConverter(self.event, self.context)
# Patch get_lambda_config_property
self.patch_getconfig = patch(
'crassus.output_converter.get_lambda_config_property')
self.mock_getconfig = self.patch_getconfig.start()
self.mock_getconfig.return_value = ['OUTPUT-SQS-QUEUE-1']
# Patch logger
self.patch_logger = patch('crassus.output_converter.logger')
self.mock_logger = self.patch_logger.start()
# Patch sqs_send_message
self.patch_sqs_send = patch(
'crassus.output_converter.sqs_send_message')
self.mock_sqs_send = self.patch_sqs_send.start()
def teardown(self):
self.patch_getconfig.stop()
self.patch_logger.stop()
self.patch_sqs_send.stop()
def test_cast_type_string(self):
"""
_cast_type() should return string if the input is not a valid
JSON.
"""
invalid_json = '{foo'
return_value = self.output_converter._cast_type(invalid_json)
self.assertEqual(return_value, invalid_json)
def test_cast_type_json(self):
"""
_cast_type() should return a python type if the input is a valid
JSON.
"""
valid_json = '{"foo":"bar"}'
return_value = self.output_converter._cast_type(valid_json)
self.assertEqual(return_value, json.loads(valid_json))
def test_parser_parses_correctly(self):
"""
Test if the input event is parsed correctly.
We only check parts of the input event, which implies it was
parsed properly.
"""
return_value = self.output_converter._parse_sns_message(
self.event['Records'][0]['Sns']['Message'])
self.assertEqual(return_value['ResourceStatus'], 'CREATE_IN_PROGRESS')
self.assertEqual(return_value['Namespace'], 123456789012)
self.assertEqual(return_value['StackName'], 'crassus-karolyi-temp1')
self.assertNotEqual(
return_value['StackName'], 'crassus-karolyi-temp1garbage')
self.assertEqual(return_value['ResourceProperties'], {
'Action': 'lambda:invokeFunction',
'SourceArn':
'arn:aws:sns:eu-west-1:123456789012:crassus-karolyi-temp1-'
'cfnOutputSnsTopic-KKF3Y90CS6SA',
'FunctionName':
'crassus-karolyi-temp1-cfnOutputConverterFunction-'
'7T8X9HH83YRH',
'Principal': 'sns.amazonaws.com'})
def test_different_termination_parsed(self):
"""
Test if the input event is parsed correctly. In this test, the
message parameter does not have a "'\n" termination at the end
of it, yet the parser parses the last parameter correctly.
We only check parts of the input event, which implies it was
parsed properly.
"""
return_value = self.output_converter._parse_sns_message(
cfn_event_different_termination['Records'][0]['Sns']['Message'])
self.assertEqual(return_value['ResourceStatus'], 'CREATE_IN_PROGRESS')
self.assertEqual(return_value['Namespace'], 123456789012)
# All hail the successful parsing, last parameter is StackName!
self.assertEqual(return_value['StackName'], 'crassus-karolyi-temp1')
# ... and the value should NOT have a closing quote.
self.assertNotEqual(
return_value['StackName'], 'crassus-karolyi-temp1\'')
self.assertEqual(return_value['ResourceProperties'], {
'Action': 'lambda:invokeFunction',
'SourceArn':
'arn:aws:sns:eu-west-1:123456789012:crassus-karolyi-temp1-'
'cfnOutputSnsTopic-KKF3Y90CS6SA',
'FunctionName':
'crassus-karolyi-temp1-cfnOutputConverterFunction-'
'7T8X9HH83YRH',
'Principal': 'sns.amazonaws.com'})
def test_converts_correctly(self):
"""
convert() should call and initialize the right
functions/objects.
"""
self.output_converter.convert()
self.assertEqual(self.mock_logger.warning.call_count, 0)
self.mock_sqs_send.assert_called_once_with(
['OUTPUT-SQS-QUEUE-1'], {
'status': 'CREATE_IN_PROGRESS',
'timestamp': '2015-11-23T16:53:46.443Z',
'stackName': 'crassus-karolyi-temp1',
'version': '1.1',
'message': 'Resource creation Initiated',
'emitter': 'cloudformation',
'resourceType': 'AWS::Lambda::Permission'})
deployment_parameter = self.mock_sqs_send.call_args[0][1]
self.assertIs(type(deployment_parameter), DeploymentResponse)
def test_skips_empty_messages(self):
"""
If there is no 'Sns' or 'Message' in the received event list,
log a warning.
"""
self.output_converter.event = {'Records': [{}, {'foo': 1}]}
self.output_converter.convert()
self.assertFalse(self.mock_sqs_send.called)
self.assertEqual(list(self.mock_logger.warning.call_args_list), [
call('No \'Sns\' or \'Message\' in received event: {}'),
call('No \'Sns\' or \'Message\' in received event: {\'foo\': 1}')])