mirror of
https://github.com/sprockets/sprockets.clients.dynamodb.git
synced 2024-11-23 11:19:54 +00:00
Initial pass at mixins module.
Needs a little love, but the functionality is there. For some reason the round-trip test is not working. I would guess that it is not finding the dynamodb instance correctly.
This commit is contained in:
Dave Shawley
parent
96b29a5288
commit
6be04d8026
2 changed files with 300 additions and 0 deletions
76
sprockets/clients/dynamodb/mixins.py
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76
sprockets/clients/dynamodb/mixins.py
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@ -0,0 +1,76 @@
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import logging
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from sprockets.clients.dynamodb import exceptions
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from tornado import gen, web
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class DynamoMixin(web.RequestHandler):
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def initialize(self):
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super(DynamoMixin, self).initialize()
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dynamocfg = self.settings['dynamodb']
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self.__max_retries = int(dynamocfg.get('max_retries', '3'))
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self.__rate_limit_retry = int(dynamocfg.get('retry_after', '3'))
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self.dynamo = self.application.dynamo
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if not hasattr(self, 'logger'):
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self.logger = logging.getLogger(self.__class__.__name__)
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def _on_dynamodb_exception(self, error, attempt):
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"""
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:param exceptions.DynamoDBException error:
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"""
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if isinstance(error, exceptions.NoCredentialsError):
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self.logger.error('DynamoDB credentials error: %s', error)
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self.send_error(500, reason='Database Authentication')
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elif isinstance(error, exceptions.RequestException):
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if attempt >= self.__max_retries:
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self.send_error(500, reason='Database Request Failure')
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else:
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self.logger.warning('DynamoDB request exception #%i, '
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'retrying', attempt)
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return
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elif isinstance(error, exceptions.ThroughputExceeded):
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self.logger.warning('DynamoDB throughput exceeded: %s', error)
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self.set_status(429)
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self.add_header('Retry-After', self.__rate_limit_retry)
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if hasattr(self, 'send_response'):
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self.send_response(
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{'error': 'Database throughput exceeded. Retry after {} '
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'seconds'.format(self.__rate_limit_retry)})
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self.finish()
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elif isinstance(error, exceptions.TimeoutException):
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self.logger.error('DynamoDB timeout')
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self.send_error(500, reason='Database Timeout')
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else:
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self.logger.error('DynamoDB error: %s (%r)', error, error.args)
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self.send_error(500, reason='Unexpected Error {}'.format(error))
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raise error
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@gen.coroutine
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def get_item(self, table_name, key):
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for attempt in range(0, self.__max_retries + 1):
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try:
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self.logger.debug('get_item %d', attempt)
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item = yield self.dynamo.get_item(table_name, key)
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raise gen.Return(item)
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except exceptions.DynamoDBException as error:
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self._on_dynamodb_exception(error, attempt)
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@gen.coroutine
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def put_item(self, table_name, item):
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for attempt in range(0, self.__max_retries + 1):
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try:
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result = yield self.dynamo.put_item(table_name, item)
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raise gen.Return(result)
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except exceptions.DynamoDBException as error:
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self._on_dynamodb_exception(error, attempt)
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@gen.coroutine
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def dynamodb_execute(self, function, arg_dict):
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for attempt in range(0, self.__max_retries + 1):
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try:
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results = yield self.dynamo.execute(function, arg_dict)
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raise gen.Return(results)
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except exceptions.DynamoDBException as error:
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self._on_dynamodb_exception(error, attempt)
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224
tests/dynamomixin_tests.py
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224
tests/dynamomixin_tests.py
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@ -0,0 +1,224 @@
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import json
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import unittest
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import uuid
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try:
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from unittest import mock
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except ImportError:
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import mock
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from tornado import concurrent, gen, ioloop, testing, web
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from sprockets.clients.dynamodb import connector, mixins
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from sprockets.clients.dynamodb import exceptions as dynamo_exceptions
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class CRUDHandler(mixins.DynamoMixin):
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@gen.coroutine
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def get(self, *args, **kwargs):
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item = yield self.get_item(self.path_args[0],
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{'id': self.path_args[1]})
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self.write(json.dumps(item).encode('utf-8'))
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self.set_status(200)
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self.finish()
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@gen.coroutine
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def put(self, *args, **kwargs):
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yield self.put_item(self.path_args[0],
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json.loads(self.request.body.decode('utf-8')))
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self.set_status(200)
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self.finish()
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@gen.coroutine
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def post(self, *args, **kwargs):
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yield self.dynamodb_execute(
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self.path_args[0],
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json.loads(self.request.body.decode('utf-8')))
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class _CommonOperationTests(testing.AsyncHTTPTestCase):
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num_retries = 2
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retry_after = 3
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def setUp(self):
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self.application = None
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super(_CommonOperationTests, self).setUp()
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def get_app(self):
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if self.application is None:
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self.application = web.Application(
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[web.url('/(.*)/(.*)', CRUDHandler),
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web.url('/(.*)', CRUDHandler)],
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dynamodb={'max_retries': self.num_retries,
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'retry_after': self.retry_after})
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setattr(self.application, 'dynamo', mock.Mock())
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return self.application
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@property
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def dynamo_mock(self):
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raise NotImplementedError
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def perform_action(self):
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raise NotImplementedError
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def test_that_operation_can_succeed(self):
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future = concurrent.Future()
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future.set_result({})
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self.dynamo_mock.return_value = future
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response = self.perform_action()
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self.assertEqual(response.code, 200)
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self.assertEqual(self.dynamo_mock.call_count, 1)
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def test_that_operation_returns_500_on_dynamodb_failure(self):
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self.dynamo_mock.side_effect = dynamo_exceptions.DynamoDBException
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response = self.perform_action()
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self.assertEqual(response.code, 500)
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self.assertEqual(self.dynamo_mock.call_count, 1)
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def test_that_operation_retries_request_exceptions(self):
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self.dynamo_mock.side_effect = dynamo_exceptions.RequestException
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response = self.perform_action()
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self.assertEqual(response.code, 500)
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self.assertEqual(self.dynamo_mock.call_count, self.num_retries + 1)
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def test_that_operation_retry_can_succeed(self):
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future = concurrent.Future()
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future.set_result({})
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self.dynamo_mock.side_effect = [dynamo_exceptions.RequestException,
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future]
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response = self.perform_action()
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self.assertEqual(response.code, 200)
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self.assertEqual(self.dynamo_mock.call_count, 2)
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def test_that_operation_credentials_error_returns_500(self):
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self.dynamo_mock.side_effect = dynamo_exceptions.NoCredentialsError
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response = self.perform_action()
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self.assertEqual(response.code, 500)
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self.assertEqual(self.dynamo_mock.call_count, 1)
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def test_that_operation_timeout_returns_500(self):
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self.dynamo_mock.side_effect = dynamo_exceptions.TimeoutException
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response = self.perform_action()
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self.assertEqual(response.code, 500)
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self.assertEqual(self.dynamo_mock.call_count, 1)
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def test_that_operation_rate_limits(self):
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self.dynamo_mock.side_effect = dynamo_exceptions.ThroughputExceeded
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response = self.perform_action()
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self.assertEqual(response.code, 429)
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self.assertEqual(self.dynamo_mock.call_count, 1)
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self.assertEqual(response.headers['Retry-After'],
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str(self.retry_after))
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class GetItemTests(_CommonOperationTests):
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@property
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def dynamo_mock(self):
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return self.application.dynamo.get_item
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def perform_action(self):
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return self.fetch('/table/key')
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class PutItemTests(_CommonOperationTests):
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@property
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def dynamo_mock(self):
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return self.application.dynamo.put_item
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def perform_action(self):
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return self.fetch('/table', method='PUT', body='{"one":2}',
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headers={'Content-Type': 'application/json'})
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class DynamoDBExecuteTests(_CommonOperationTests):
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@property
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def dynamo_mock(self):
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return self.application.dynamo.execute
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def perform_action(self):
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return self.fetch('/operation', method='POST', body='"something"',
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headers={'Content-Type': 'application/json'})
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@gen.coroutine
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def create_table(dynamodb, tabledef):
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max_attempts = 10
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first_time = True
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response = {}
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while not response.get('TableStatus') == 'Active':
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try:
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response = yield dynamodb.describe_table(tabledef['TableName'])
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except dynamo_exceptions.ResourceNotFound:
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if first_time:
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first_time = False
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response = yield dynamodb.create_table(tabledef)
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yield gen.sleep(0.25)
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max_attempts -= 1
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if max_attempts <= 0:
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raise RuntimeError('Failed to create table')
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@unittest.skip('Currently broken in this project...')
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class RoundTripTests(testing.AsyncHTTPTestCase):
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@classmethod
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def setUpClass(cls):
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super(RoundTripTests, cls).setUpClass()
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cls.table_name = uuid.uuid4().hex
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tabledef = {
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'TableName': cls.table_name,
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'AttributeDefinitions': [
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{'AttributeName': 'id', 'AttributeType': 'S'}],
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'KeySchema': [{'AttributeName': 'id', 'KeyType': 'HASH'}],
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'ProvisionedThroughput': {'ReadCapacityUnits': 1,
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'WriteCapacityUnits': 1},
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}
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iol = ioloop.IOLoop.instance()
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dynamo = connector.DynamoDB()
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iol.add_future(create_table(dynamo, tabledef),
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lambda f: iol.stop())
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iol.start()
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@classmethod
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def tearDownClass(cls):
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super(RoundTripTests, cls).tearDownClass()
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iol = ioloop.IOLoop.instance()
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dynamo = connector.DynamoDB()
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iol.add_future(dynamo.delete_table(cls.table_name),
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lambda f: iol.stop())
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iol.start()
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def setUp(self):
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self.application = None
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super(RoundTripTests, self).setUp()
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def get_app(self):
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if self.application is None:
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self.application = web.Application(
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[web.url('/(.*)/(.*)', CRUDHandler),
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web.url('/(.*)', CRUDHandler)],
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dynamodb={})
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setattr(self.application, 'dynamo', connector.DynamoDB())
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return self.application
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def test_that_item_can_created_and_fetched(self):
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object_id = str(uuid.uuid4())
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response = self.fetch(
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'/{}'.format(self.table_name), method='PUT',
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body=json.dumps({'id': object_id}).encode('utf-8'),
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headers={'Content-Type': 'application/json'})
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self.assertEqual(response.code, 200)
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response = self.fetch(
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'/{}/{}'.format(self.table_name, object_id),
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headers={'Accept': 'application/json'})
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self.assertEqual(response.code, 200)
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self.assertEqual(json.loads(response.body.decode('utf-8')),
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{'id': object_id})
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