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# Copyright 2016 Amazon.com, Inc. or its affiliates. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"). You # may not use this file except in compliance with the License. A copy of # the License is located at # # http://aws.amazon.com/apache2.0/ # # or in the "license" file accompanying this file. This file is # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF # ANY KIND, either express or implied. See the License for the specific # language governing permissions and limitations under the License. import copy from collections import deque from pprint import pformat from botocore.awsrequest import AWSResponse from botocore.exceptions import ( ParamValidationError, StubAssertionError, StubResponseError, UnStubbedResponseError, ) from botocore.validate import validate_parameters class _ANY: """ A helper object that compares equal to everything. Copied from unittest.mock """ def __eq__(self, other): return True def __ne__(self, other): return False def __repr__(self): return '<ANY>' ANY = _ANY() class Stubber: """ This class will allow you to stub out requests so you don't have to hit an endpoint to write tests. Responses are returned first in, first out. If operations are called out of order, or are called with no remaining queued responses, an error will be raised. **Example:** :: import datetime import botocore.session from botocore.stub import Stubber s3 = botocore.session.get_session().create_client('s3') stubber = Stubber(s3) response = { 'IsTruncated': False, 'Name': 'test-bucket', 'MaxKeys': 1000, 'Prefix': '', 'Contents': [{ 'Key': 'test.txt', 'ETag': '"abc123"', 'StorageClass': 'STANDARD', 'LastModified': datetime.datetime(2016, 1, 20, 22, 9), 'Owner': {'ID': 'abc123', 'DisplayName': 'myname'}, 'Size': 14814 }], 'EncodingType': 'url', 'ResponseMetadata': { 'RequestId': 'abc123', 'HTTPStatusCode': 200, 'HostId': 'abc123' }, 'Marker': '' } expected_params = {'Bucket': 'test-bucket'} stubber.add_response('list_objects', response, expected_params) stubber.activate() service_response = s3.list_objects(Bucket='test-bucket') assert service_response == response This class can also be called as a context manager, which will handle activation / deactivation for you. **Example:** :: import datetime import botocore.session from botocore.stub import Stubber s3 = botocore.session.get_session().create_client('s3') response = { "Owner": { "ID": "foo", "DisplayName": "bar" }, "Buckets": [{ "CreationDate": datetime.datetime(2016, 1, 20, 22, 9), "Name": "baz" }] } with Stubber(s3) as stubber: stubber.add_response('list_buckets', response, {}) service_response = s3.list_buckets() assert service_response == response If you have an input parameter that is a randomly generated value, or you otherwise don't care about its value, you can use ``stub.ANY`` to ignore it in validation. **Example:** :: import datetime import botocore.session from botocore.stub import Stubber, ANY s3 = botocore.session.get_session().create_client('s3') stubber = Stubber(s3) response = { 'IsTruncated': False, 'Name': 'test-bucket', 'MaxKeys': 1000, 'Prefix': '', 'Contents': [{ 'Key': 'test.txt', 'ETag': '"abc123"', 'StorageClass': 'STANDARD', 'LastModified': datetime.datetime(2016, 1, 20, 22, 9), 'Owner': {'ID': 'abc123', 'DisplayName': 'myname'}, 'Size': 14814 }], 'EncodingType': 'url', 'ResponseMetadata': { 'RequestId': 'abc123', 'HTTPStatusCode': 200, 'HostId': 'abc123' }, 'Marker': '' } expected_params = {'Bucket': ANY} stubber.add_response('list_objects', response, expected_params) with stubber: service_response = s3.list_objects(Bucket='test-bucket') assert service_response == response """ def __init__(self, client): """ :param client: The client to add your stubs to. """ self.client = client self._event_id = 'boto_stubber' self._expected_params_event_id = 'boto_stubber_expected_params' self._queue = deque() def __enter__(self): self.activate() return self def __exit__(self, exception_type, exception_value, traceback): self.deactivate() def activate(self): """ Activates the stubber on the client """ self.client.meta.events.register_first( 'before-parameter-build.*.*', self._assert_expected_params, unique_id=self._expected_params_event_id, ) self.client.meta.events.register( 'before-call.*.*', self._get_response_handler, unique_id=self._event_id, ) def deactivate(self): """ Deactivates the stubber on the client """ self.client.meta.events.unregister( 'before-parameter-build.*.*', self._assert_expected_params, unique_id=self._expected_params_event_id, ) self.client.meta.events.unregister( 'before-call.*.*', self._get_response_handler, unique_id=self._event_id, ) def add_response(self, method, service_response, expected_params=None): """ Adds a service response to the response queue. This will be validated against the service model to ensure correctness. It should be noted, however, that while missing attributes are often considered correct, your code may not function properly if you leave them out. Therefore you should always fill in every value you see in a typical response for your particular request. :param method: The name of the client method to stub. :type method: str :param service_response: A dict response stub. Provided parameters will be validated against the service model. :type service_response: dict :param expected_params: A dictionary of the expected parameters to be called for the provided service response. The parameters match the names of keyword arguments passed to that client call. If any of the parameters differ a ``StubResponseError`` is thrown. You can use stub.ANY to indicate a particular parameter to ignore in validation. stub.ANY is only valid for top level params. """ self._add_response(method, service_response, expected_params) def _add_response(self, method, service_response, expected_params): if not hasattr(self.client, method): raise ValueError( "Client %s does not have method: %s" % (self.client.meta.service_model.service_name, method) ) # Create a successful http response http_response = AWSResponse(None, 200, {}, None) operation_name = self.client.meta.method_to_api_mapping.get(method) self._validate_operation_response(operation_name, service_response) # Add the service_response to the queue for returning responses response = { 'operation_name': operation_name, 'response': (http_response, service_response), 'expected_params': expected_params, } self._queue.append(response) def add_client_error( self, method, service_error_code='', service_message='', http_status_code=400, service_error_meta=None, expected_params=None, response_meta=None, modeled_fields=None, ): """ Adds a ``ClientError`` to the response queue. :param method: The name of the service method to return the error on. :type method: str :param service_error_code: The service error code to return, e.g. ``NoSuchBucket`` :type service_error_code: str :param service_message: The service message to return, e.g. 'The specified bucket does not exist.' :type service_message: str :param http_status_code: The HTTP status code to return, e.g. 404, etc :type http_status_code: int :param service_error_meta: Additional keys to be added to the service Error :type service_error_meta: dict :param expected_params: A dictionary of the expected parameters to be called for the provided service response. The parameters match the names of keyword arguments passed to that client call. If any of the parameters differ a ``StubResponseError`` is thrown. You can use stub.ANY to indicate a particular parameter to ignore in validation. :param response_meta: Additional keys to be added to the response's ResponseMetadata :type response_meta: dict :param modeled_fields: Additional keys to be added to the response based on fields that are modeled for the particular error code. These keys will be validated against the particular error shape designated by the error code. :type modeled_fields: dict """ http_response = AWSResponse(None, http_status_code, {}, None) # We don't look to the model to build this because the caller would # need to know the details of what the HTTP body would need to # look like. parsed_response = { 'ResponseMetadata': {'HTTPStatusCode': http_status_code}, 'Error': {'Message': service_message, 'Code': service_error_code}, } if service_error_meta is not None: parsed_response['Error'].update(service_error_meta) if response_meta is not None: parsed_response['ResponseMetadata'].update(response_meta) if modeled_fields is not None: service_model = self.client.meta.service_model shape = service_model.shape_for_error_code(service_error_code) self._validate_response(shape, modeled_fields) parsed_response.update(modeled_fields) operation_name = self.client.meta.method_to_api_mapping.get(method) # Note that we do not allow for expected_params while # adding errors into the queue yet. response = { 'operation_name': operation_name, 'response': (http_response, parsed_response), 'expected_params': expected_params, } self._queue.append(response) def assert_no_pending_responses(self): """ Asserts that all expected calls were made. """ remaining = len(self._queue) if remaining != 0: raise AssertionError(f"{remaining} responses remaining in queue.") def _assert_expected_call_order(self, model, params): if not self._queue: raise UnStubbedResponseError( operation_name=model.name, reason=( 'Unexpected API Call: A call was made but no additional ' 'calls expected. Either the API Call was not stubbed or ' 'it was called multiple times.' ), ) name = self._queue[0]['operation_name'] if name != model.name: raise StubResponseError( operation_name=model.name, reason=f'Operation mismatch: found response for {name}.', ) def _get_response_handler(self, model, params, context, **kwargs): self._assert_expected_call_order(model, params) # Pop off the entire response once everything has been validated return self._queue.popleft()['response'] def _assert_expected_params(self, model, params, context, **kwargs): if self._should_not_stub(context): return self._assert_expected_call_order(model, params) expected_params = self._queue[0]['expected_params'] if expected_params is None: return # Validate the parameters are equal for param, value in expected_params.items(): if param not in params or expected_params[param] != params[param]: raise StubAssertionError( operation_name=model.name, reason='Expected parameters:\n%s,\nbut received:\n%s' % (pformat(expected_params), pformat(params)), ) # Ensure there are no extra params hanging around if sorted(expected_params.keys()) != sorted(params.keys()): raise StubAssertionError( operation_name=model.name, reason='Expected parameters:\n%s,\nbut received:\n%s' % (pformat(expected_params), pformat(params)), ) def _should_not_stub(self, context): # Do not include presign requests when processing stubbed client calls # as a presign request will never have an HTTP request sent over the # wire for it and therefore not receive a response back. if context and context.get('is_presign_request'): return True def _validate_operation_response(self, operation_name, service_response): service_model = self.client.meta.service_model operation_model = service_model.operation_model(operation_name) output_shape = operation_model.output_shape # Remove ResponseMetadata so that the validator doesn't attempt to # perform validation on it. response = service_response if 'ResponseMetadata' in response: response = copy.copy(service_response) del response['ResponseMetadata'] self._validate_response(output_shape, response) def _validate_response(self, shape, response): if shape is not None: validate_parameters(response, shape) elif response: # If the output shape is None, that means the response should be # empty apart from ResponseMetadata raise ParamValidationError( report=( "Service response should only contain ResponseMetadata." ) )