diff --git a/python-test-samples/hexagonal-architectures/README.md b/python-test-samples/hexagonal-architectures/README.md new file mode 100644 index 00000000..0afde6fc --- /dev/null +++ b/python-test-samples/hexagonal-architectures/README.md @@ -0,0 +1,148 @@ +[![python: 3.9](https://img.shields.io/badge/Python-3.9-green)](https://img.shields.io/badge/Python-3.9-green) +[![AWS: API Gateway](https://img.shields.io/badge/AWS-API%20Gateway-blueviolet)](https://img.shields.io/badge/AWS-API%20Gateway-blueviolet) +[![AWS: DynamoDB](https://img.shields.io/badge/AWS-DynamoDB-blueviolet)](https://img.shields.io/badge/AWS-DynamoDB-blueviolet) +[![test: unit](https://img.shields.io/badge/Test-Unit-blue)](https://img.shields.io/badge/Test-Unit-blue) +[![test: integration](https://img.shields.io/badge/Test-Integration-yellow)](https://img.shields.io/badge/Test-Integration-yellow) + +# Python: Hexagonal Architecture Example + +## Introduction +Hexagonal architecture is a pattern used for encapsulating domain logic and decoupling it from other implementation details, such as infrastructure or client requests. You can use these types of architectures to improve how to organize and test your Lambda functions. + +The project uses the [AWS Serverless Application Model](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/what-is-sam.html) (SAM) CLI for configuration, testing and deployment. + +--- + +## System Under Test (SUT) + +The SUT in this pattern is a Lambda function that is organized using a hexagonal architecture. You can read this [blog post](https://aws.amazon.com/blogs/compute/developing-evolutionary-architecture-with-aws-lambda/) to learn more about these types of architectures. The example in this test pattern receives a request via API Gateway and makes calls out to other AWS cloud services like DynamoDB. + +![Diagram](img/hexagonal-architecture-diagram.png) + +--- + +## Contents +- [Python: Hexagonal Architecture Example](#python-hexagonal-architecture-example) + - [Introduction](#introduction) + - [System Under Test (SUT)](#system-under-test-sut) + - [Contents](#contents) + - [Key Files in the Project](#key-files-in-the-project) + - [Sample project description](#sample-project-description) + - [Terms:](#terms) + - [Application Description](#application-description) + - [Testing Data Considerations](#testing-data-considerations) + - [Run the Unit Test](#run-the-unit-test) + - [Run the Integration Test](#run-the-integration-test) +--- + +## Key Files in the Project + - [app.py](src/app.py) - Lambda handler code to test + - [template.yaml](template.yaml) - SAM script for deployment + - [mock_test.py](tests/unit/mock_test.py) - Unit test using mocks + - [test_api_gateway.py](tests/integration/test_api_gateway.py) - Integration tests on a live stack + +[Top](#contents) + +--- + +## Sample project description + +Hexagonal Architecture: +Hexagonal architecture is also known as the ports and adapters architecture. It is an architectural pattern used for encapsulating domain logic and decoupling it from other implementation details, such as infrastructure or client requests. + +In Lambda functions, hexagonal architecture can help you implement new business requirements and improve the agility of a workload. This approach can help create separation of concerns and separate the domain logic from the infrastructure. For development teams, it can also simplify the implementation of new features and parallelize the work across different developers. + +### Terms: +1. *Domain logic*: Represents the task that the application should perform, abstracting any interaction with the external world. +2. *Ports*: Provide a way for the primary actors (on the left) to interact with the application, via the domain logic. The domain logic also uses ports for interacting with secondary actors (on the right) when needed. +3. *Adapters*: A design pattern for transforming one interface into another interface. They wrap the logic for interacting with a primary or secondary actor. +4. *Primary actors*: Users of the system such as a webhook, a UI request, or a test script. +5. *Secondary actors*: used by the application, these services are either a Repository (for example, a database) or a Recipient (such as a message queue). + +### Application Description +The example application is a backend web service built using Amazon API Gateway, AWS Lambda, and Amazon DynamoDB. Business logic in the domain layer should be tested with unit tests. Responses from secondary actors via ports should be mocked during unit testing to speed up test execution. + +Adapter and port code can be tested in the cloud by deploying primary and secondary actors such as an API Gateway and a DynamoDB table. The test code will create an HTTP client that will send requests to the deployed API Gateway endpoint. The endpoint will invoke the primary actor, test resource configuration, IAM permissions, authorizers, internal business logic, and secondary actors of the SUT. + +This project consists of an [API Gateway](https://aws.amazon.com/api-gateway/), a single [AWS Lambda](https://aws.amazon.com/lambda) function, and 2 [Amazon DynamoDB](https://aws.amazon.com/dynamodb) tables. + +The two DynamoDB tables are meant to track Stock ID's and prices in EUR (Euros) and Euro Currency Conversion rates. + +![Hexagonal-Architecture.drawio.png](img/Hexagonal-Architecture.drawio.png) + +[Top](#contents) + +--- + +## Testing Data Considerations + +Data persistence brings additional testing considerations. + +First, the data stores must be pre-populated with data to test certain functionality. In our example, we need a valid stock and valid currency conversion data to test our function. Therefore, we will add data to the data stores prior to running the tests. This data seeding operation is performed in the test setup. + +Second, the data store will be populated as a side-effect of our testing. In our example, stock and currency conversion data will be populated in our DynamoDB tables. To prevent unintended side-effects, we will clean-up data generated during the test execution. This data cleaning operation is performed in the test tear-down. + +[Top](#contents) + +--- + +## Run the Unit Test +[mock_test.py](tests/unit/mock_test.py) + +In the [unit test](tests/unit/mock_test.py), all references and calls to the DynamoDB service [are mocked on line 22](tests/unit/mock_test.py#L22). + +The unit test establishes the STOCKS_DB_TABLE and CURRENCIES_DB_TABLE environment variables that the Lambda function uses to reference the DynamoDB tables. STOCKS_DB_TABLE and CURRENCIES_DB_TABLE are defined in the [setUp method of test class in mock_test.py](tests/unit/mock_test.py#L29-81). + +In a unit test, you must create a mocked version of the DynamoDB table. The example approach in the [setUp method of test class in mock_test.py](tests/unit/mock_test.py#L43-50) reads in the DynamoDB table schema directly the [SAM Template](template.yaml) so that the definition is maintained in one place. This simple technique works if there are no intrinsics (like !If or !Ref) in the resource properties for KeySchema, AttributeDefinitions, & BillingMode. Once the mocked table is created, test data is populated. + +With the mocked DynamoDB table created and the STOCKS_DB_TABLE and CURRENCIES_DB_TABLE set to the mocked table names, the Lambda function will use the mocked DynamoDB tables when executing. + +The [unit test tear-down](tests/unit/mock_test.py#L61-66) removes the mocked DynamoDB tables and clears the STOCKS_DB_TABLE and CURRENCIES_DB_TABLE environment variables. + +To run the unit test, execute the following +```shell +# Create and Activate a Python Virtual Environment +# One-time setup +hexagonal-architectures$ pip3 install virtualenv +hexagonal-architectures$ python3 -m venv venv +hexagonal-architectures$ source ./venv/bin/activate + +# install dependencies +hexagonal-architectures$ pip3 install -r tests/unit/requirements.txt + +# run unit tests with mocks +hexagonal-architectures$ python -m pytest -s tests/unit -v +``` + +[Top](#contents) + +--- + +## Run the Integration Test + +[test_api_gateway.py](tests/integration/test_api_gateway.py) + +For integration tests, the full stack is deployed before testing: +```shell +hexagonal-architectures$ sam build +hexagonal-architectures$ sam deploy --guided +``` + +The [integration test](tests/integration/test_api_gateway.py) setup determines both the [API endpoint](tests/integration/test_api_gateway.py#L50-53) and the name of the [DynamoDB table](tests/integration/test_api_gateway.py#L56-58) in the stack. + +The integration test then [populates data into the DynamoDB table](tests/integration/test_api_gateway.py#L66-70). + +The [integration test tear-down](tests/integration/test_api_gateway.py#L73-87) removes the seed data, as well as data generated during the test. + +To run the integration test, create the environment variable "AWS_SAM_STACK_NAME" with the name of the test stack, and execute the test. + +```shell +# Set the environment variables AWS_SAM_STACK_NAME and (optionally)AWS_DEFAULT_REGION +# to match the name of the stack and the region where you will test + +hexagonal-architectures$ AWS_SAM_STACK_NAME= AWS_DEFAULT_REGION= python -m pytest -s tests/integration -v +``` + +[Top](#contents) + +--- \ No newline at end of file diff --git a/python-test-samples/hexagonal-architectures/THIRD-PARTY-LICENSES b/python-test-samples/hexagonal-architectures/THIRD-PARTY-LICENSES new file mode 100644 index 00000000..3712eac8 --- /dev/null +++ b/python-test-samples/hexagonal-architectures/THIRD-PARTY-LICENSES @@ -0,0 +1,176 @@ +** Tensorflow - https://github.com/tensorflow/tensorflow/ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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index 00000000..3536b699 Binary files /dev/null and b/python-test-samples/hexagonal-architectures/img/Hexagonal-Architecture.drawio.png differ diff --git a/python-test-samples/hexagonal-architectures/img/hexagonal-architecture-diagram.png b/python-test-samples/hexagonal-architectures/img/hexagonal-architecture-diagram.png new file mode 100644 index 00000000..7d53c0a6 Binary files /dev/null and b/python-test-samples/hexagonal-architectures/img/hexagonal-architecture-diagram.png differ diff --git a/python-test-samples/hexagonal-architectures/metadata.json b/python-test-samples/hexagonal-architectures/metadata.json new file mode 100644 index 00000000..ce79e1e6 --- /dev/null +++ b/python-test-samples/hexagonal-architectures/metadata.json @@ -0,0 +1,35 @@ +{ + "title": "Hexagonal Architecture", + "description": "This project contains unit and integration tests for an application designed with Hexagonal Architecture.", + "content_language": "English", + "language": "Python", + "type": ["Unit", "Integration"], + "diagram": "/img/hexagonal-architecture-diagram.png", + "framework": "SAM", + "services": ["apigw", "lambda", "dynamodb"], + "git_repo_url": "https://github.com/aws-samples/serverless-test-samples", + "pattern_source": "AWS", + "pattern_detail_tabs": [ + { + "title": "Application Code", + "filepath": "/src/app.py" + }, + { + "title": "Unit Tests", + "filepath": "/tests/unit/mock_test.py" + }, + { + "title": "Integration Test", + "filepath": "/tests/integration/test_api_gateway.py" + } + ], + "authors": [ + { + "name": "Rohan Mehta", + "image": "https://media.licdn.com/dms/image/C4D03AQG1qfZlu1eemw/profile-displayphoto-shrink_800_800/0/1573532217447?e=1687392000&v=beta&t=732VxZY4sKbyP0gkofdK4KJIbV0dRFpfxqos_KR_PYQ", + "bio": "Cloud Application Architect at AWS", + "linkedin": "https://www.linkedin.com/in/rohan-mehta-dev/", + "twitter": "https://twitter.com/rohanmehta_dev" + } + ] +} \ No newline at end of file diff --git a/python-test-samples/hexagonal-architectures/requirements.txt b/python-test-samples/hexagonal-architectures/requirements.txt new file mode 100644 index 00000000..7762dee9 --- /dev/null +++ b/python-test-samples/hexagonal-architectures/requirements.txt @@ -0,0 +1,6 @@ +aws-xray-sdk +aws_lambda_powertools +fastjsonschema +boto3 +pytest +moto \ No newline at end of file diff --git a/python-test-samples/hexagonal-architectures/src/__init__.py b/python-test-samples/hexagonal-architectures/src/__init__.py new file mode 100644 index 00000000..e69de29b diff --git a/python-test-samples/hexagonal-architectures/src/adapters/__init__.py b/python-test-samples/hexagonal-architectures/src/adapters/__init__.py new file mode 100644 index 00000000..e69de29b diff --git a/python-test-samples/hexagonal-architectures/src/adapters/currency_exchange_db.py b/python-test-samples/hexagonal-architectures/src/adapters/currency_exchange_db.py new file mode 100644 index 00000000..8c254775 --- /dev/null +++ b/python-test-samples/hexagonal-architectures/src/adapters/currency_exchange_db.py @@ -0,0 +1,25 @@ +""" +Currentcy Exchange DB Adapter +""" +from os import environ +import boto3 + +def get_currencies(currencies): + """ + get_currencies: Gets the currencies from the DynamoDB table. + """ + try: + dynamodb_table_name = environ["CURRENCIES_DB_TABLE"] + dynamodb_resource = boto3.resource('dynamodb') + dynamodb_table = dynamodb_resource.Table(dynamodb_table_name) + print(f"Using DynamoDB Table {dynamodb_table_name}.") + rates = {} + for currency in currencies: + dynamodb_response = dynamodb_table.get_item(Key={"CURRENCY": f"{currency}"}) + rates[dynamodb_response["Item"]["CURRENCY"]] = dynamodb_response["Item"]["Rate"] + print(rates) + return rates + except Exception as err: + print("get_currencies Error:" + str(err) + " : " + str(type(err))) + raise err + \ No newline at end of file diff --git a/python-test-samples/hexagonal-architectures/src/adapters/handle_stock_request.py b/python-test-samples/hexagonal-architectures/src/adapters/handle_stock_request.py new file mode 100644 index 00000000..4757d80b --- /dev/null +++ b/python-test-samples/hexagonal-architectures/src/adapters/handle_stock_request.py @@ -0,0 +1,23 @@ +""" +Stock Request DB Adapter +""" +import json +from src.ports import http_handler + +def get_stocks_request(stock_id): + """ + get_stocks_request - retrieve a stock from the DB + """ + try: + stock_data = http_handler.retrieve_stock(stock_id) + print("Stock Data", stock_data) + response = { + 'statusCode': 200, + 'body': json.dumps({ + "message": stock_data, + }) + } + return response + except Exception as err: + print("get_stocks_request Error:" + str(err) + " : " + str(type(err))) + raise err diff --git a/python-test-samples/hexagonal-architectures/src/adapters/stocks_db.py b/python-test-samples/hexagonal-architectures/src/adapters/stocks_db.py new file mode 100644 index 00000000..a6dfe511 --- /dev/null +++ b/python-test-samples/hexagonal-architectures/src/adapters/stocks_db.py @@ -0,0 +1,24 @@ +""" +Stock Value DB Adapter +""" +from os import environ +import boto3 + +def get_stock_value(stock_id): + """ + get_stock_value - retrieve a stock from the DB + """ + try: + dynamodb_table_name = environ["STOCKS_DB_TABLE"] + dynamodb_resource = boto3.resource('dynamodb') + dynamodb_table = dynamodb_resource.Table(dynamodb_table_name) + print(f"Using DynamoDB Table {dynamodb_table_name}.") + dynamodb_response = dynamodb_table.get_item(Key={"STOCK_ID": f"{stock_id}"}) + if "Item" not in dynamodb_response: + raise ValueError("Stock not found") + print("dynamodb response", dynamodb_response) + return dynamodb_response + except Exception as err: + print("get_stock_value Error:" + str(err) + " : " + str(type(err))) + raise err + \ No newline at end of file diff --git a/python-test-samples/hexagonal-architectures/src/app.py b/python-test-samples/hexagonal-architectures/src/app.py new file mode 100644 index 00000000..792b2f20 --- /dev/null +++ b/python-test-samples/hexagonal-architectures/src/app.py @@ -0,0 +1,32 @@ +""" +# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. +# SPDX-License-Identifier: MIT-0 + +Lambda Handler for the Python hexagonal-architectures example +This handler accepts a stock ID and provides the price of the stock in four currencies. +The id and price in Euros associated with the stock is stored in a DynamoDB Table. +The currency conversion rates for Euros to USD, CAD, and AUD are stored in another DynamoDB table. +""" +from src.adapters import handle_stock_request + +# from aws_lambda_powertools.utilities.data_classes import APIGatewayProxyEvent +# from aws_lambda_powertools.utilities.typing import LambdaContext +# from aws_lambda_powertools.utilities.validation import validator + +def lambda_handler(event, context) -> dict: + """ + lambda_handler: Entry Point + """ + try: + stock_id = event["pathParameters"]["StockID"] + response = handle_stock_request.get_stocks_request(stock_id) + return response + except ValueError as err: + print("lambda_handler ValueError:" + str(err) + " : " + str(type(err))) + return { + "statusCode": 404, + "body": "Stock not found" + } + except Exception as err: + print("lambda_handler Error:" + str(err) + " : " + str(type(err))) + raise err diff --git a/python-test-samples/hexagonal-architectures/src/domains/__init__.py b/python-test-samples/hexagonal-architectures/src/domains/__init__.py new file mode 100644 index 00000000..e69de29b diff --git a/python-test-samples/hexagonal-architectures/src/domains/stock.py b/python-test-samples/hexagonal-architectures/src/domains/stock.py new file mode 100644 index 00000000..dac94441 --- /dev/null +++ b/python-test-samples/hexagonal-architectures/src/domains/stock.py @@ -0,0 +1,34 @@ +""" +Stock Domain +""" +from decimal import Decimal +from src.ports import currencies_service +from src.ports import stocks_service + +currencies = ["USD", "CAD", "AUD"] + + +def retrieve_stock_values(stock_id): + """ + retrieve_stock_values: fetch stock in multiple currencies + """ + try: + stock_value = stocks_service.get_stock_data(stock_id) + currency_list = currencies_service.get_currencies_data(currencies) + print("STOCK VALUE", stock_value) + print("CURRENCY LIST", currency_list) + + stock_with_currencies = { + "stock": stock_value["Item"]["STOCK_ID"], + "values": { + "EUR": float(stock_value["Item"]["Value"]) + } + } + for currency in currencies: + stock_with_currencies["values"][currency] = \ + float(Decimal(stock_value["Item"]["Value"]) * currency_list[currency]) + return stock_with_currencies + except ValueError as err: + print("retrieve_stock_values Error:" + str(err) + " : " + str(type(err))) + raise err + \ No newline at end of file diff --git a/python-test-samples/hexagonal-architectures/src/ports/__init__.py b/python-test-samples/hexagonal-architectures/src/ports/__init__.py new file mode 100644 index 00000000..e69de29b diff --git a/python-test-samples/hexagonal-architectures/src/ports/currencies_service.py b/python-test-samples/hexagonal-architectures/src/ports/currencies_service.py new file mode 100644 index 00000000..0ab597e2 --- /dev/null +++ b/python-test-samples/hexagonal-architectures/src/ports/currencies_service.py @@ -0,0 +1,16 @@ +""" +Currency Exchange DB Port +""" +from src.adapters import currency_exchange_db + +def get_currencies_data(currencies): + """ + get_currencies_data: Retrieve Currencies + """ + try: + data = currency_exchange_db.get_currencies(currencies) + return data + except Exception as err: + print("get_currencies_data Error:" + str(err) + " : " + str(type(err))) + raise err + \ No newline at end of file diff --git a/python-test-samples/hexagonal-architectures/src/ports/http_handler.py b/python-test-samples/hexagonal-architectures/src/ports/http_handler.py new file mode 100644 index 00000000..3685e459 --- /dev/null +++ b/python-test-samples/hexagonal-architectures/src/ports/http_handler.py @@ -0,0 +1,16 @@ +""" +Stock Port +""" +from src.domains import stock + +def retrieve_stock(stock_id): + """ + retrieve_stock: Fetch a stock + """ + try: + stock_with_currencies = stock.retrieve_stock_values(stock_id) + return stock_with_currencies + except Exception as err: + print("retrieve_stock Error:" + str(err) + " : " + str(type(err))) + raise err + \ No newline at end of file diff --git a/python-test-samples/hexagonal-architectures/src/ports/stocks_service.py b/python-test-samples/hexagonal-architectures/src/ports/stocks_service.py new file mode 100644 index 00000000..1a4b229a --- /dev/null +++ b/python-test-samples/hexagonal-architectures/src/ports/stocks_service.py @@ -0,0 +1,16 @@ +""" +Stock Service Port +""" +from src.adapters import stocks_db + +def get_stock_data(stock_id): + """ + get_stock_data: Retrieve a stock from the stock db adapter + """ + try: + data = stocks_db.get_stock_value(stock_id) + return data + except Exception as err: + print("get_stock_data Error:" + str(err) + " : " + str(type(err))) + raise err + \ No newline at end of file diff --git a/python-test-samples/hexagonal-architectures/template.yaml b/python-test-samples/hexagonal-architectures/template.yaml new file mode 100644 index 00000000..fc93ad2d --- /dev/null +++ b/python-test-samples/hexagonal-architectures/template.yaml @@ -0,0 +1,77 @@ +AWSTemplateFormatVersion: '2010-09-09' +Transform: AWS::Serverless-2016-10-31 +Description: hexagonal-arch-sample + +Globals: + Function: + Timeout: 20 + +Resources: + StocksConverterFunction: + Type: AWS::Serverless::Function + Properties: + CodeUri: ./ + Handler: src.app.lambda_handler + Runtime: python3.9 + MemorySize: 256 + Policies: + - DynamoDBReadPolicy: + TableName: !Ref StocksTable + - DynamoDBReadPolicy: + TableName: !Ref CurrenciesTable + Environment: + Variables: + STOCKS_DB_TABLE: !Ref StocksTable + CURRENCIES_DB_TABLE: !Ref CurrenciesTable + Events: + StocksConverter: + Type: HttpApi + Properties: + ApiId: !Ref StocksGateway + Path: /stock/{StockID} + Method: get + StocksTable: + Type: AWS::DynamoDB::Table + Properties: + AttributeDefinitions: + - AttributeName: STOCK_ID + AttributeType: S + KeySchema: + - AttributeName: STOCK_ID + KeyType: HASH + BillingMode: PAY_PER_REQUEST + CurrenciesTable: + Type: AWS::DynamoDB::Table + Properties: + AttributeDefinitions: + - AttributeName: CURRENCY + AttributeType: S + KeySchema: + - AttributeName: CURRENCY + KeyType: HASH + BillingMode: PAY_PER_REQUEST + StocksGateway: + Type: AWS::Serverless::HttpApi + Properties: + CorsConfiguration: + AllowMethods: + - GET + - POST + AllowOrigins: + - "*" +Outputs: + # ServerlessRestApi is an implicit API created out of Events key under Serverless::Function + # Find out more about other implicit resources you can reference within SAM + # https://github.com/awslabs/serverless-application-model/blob/master/docs/internals/generated_resources.rst#api + StockConverterApi: + Description: "API Gateway endpoint URL for Prod stage for Stock Converter function" + Value: !Sub "https://${StocksGateway}.execute-api.${AWS::Region}.amazonaws.com/stock/{stock_id}" + StocksConverterFunction: + Description: "Stock Converter Lambda Function ARN" + Value: !GetAtt StocksConverterFunction.Arn + CurrenciesTableName: + Description: "Currencies Table Name" + Value: !Ref CurrenciesTable + StocksTableName: + Description: "Stocks Table Name" + Value: !Ref StocksTable diff --git a/python-test-samples/hexagonal-architectures/tests/__init__.py b/python-test-samples/hexagonal-architectures/tests/__init__.py new file mode 100644 index 00000000..e69de29b diff --git a/python-test-samples/hexagonal-architectures/tests/events/testevent-failure.json b/python-test-samples/hexagonal-architectures/tests/events/testevent-failure.json new file mode 100644 index 00000000..3c8a87ac --- /dev/null +++ b/python-test-samples/hexagonal-architectures/tests/events/testevent-failure.json @@ -0,0 +1,69 @@ +{ + "version": "2.0", + "routeKey": "$default", + "rawPath": "/path/to/resource", + "rawQueryString": "parameter1=value1¶meter1=value2¶meter2=value", + "cookies": [ + "cookie1", + "cookie2" + ], + "headers": { + "Header1": "value1", + "Header2": "value1,value2" + }, + "queryStringParameters": { + "parameter1": "value1,value2", + "parameter2": "value" + }, + "requestContext": { + "accountId": "123456789012", + "apiId": "api-id", + "authentication": { + "clientCert": { + "clientCertPem": "CERT_CONTENT", + "subjectDN": "www.example.com", + "issuerDN": "Example issuer", + "serialNumber": "a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1", + "validity": { + "notBefore": "May 28 12:30:02 2019 GMT", + "notAfter": "Aug 5 09:36:04 2021 GMT" + } + } + }, + "authorizer": { + "jwt": { + "claims": { + "claim1": "value1", + "claim2": "value2" + }, + "scopes": [ + "scope1", + "scope2" + ] + } + }, + "domainName": "id.execute-api.us-east-1.amazonaws.com", + "domainPrefix": "id", + "http": { + "method": "POST", + "path": "/path/to/resource", + "protocol": "HTTP/1.1", + "sourceIp": "192.168.0.1/32", + "userAgent": "agent" + }, + "requestId": "id", + "routeKey": "$default", + "stage": "$default", + "time": "12/Mar/2020:19:03:58 +0000", + "timeEpoch": 1583348638390 + }, + "body": "eyJ0ZXN0IjoiYm9keSJ9", + "pathParameters": { + "StockID": "40" + }, + "isBase64Encoded": true, + "stageVariables": { + "stageVariable1": "value1", + "stageVariable2": "value2" + } +} diff --git a/python-test-samples/hexagonal-architectures/tests/events/testevent.json b/python-test-samples/hexagonal-architectures/tests/events/testevent.json new file mode 100644 index 00000000..5beffc5e --- /dev/null +++ b/python-test-samples/hexagonal-architectures/tests/events/testevent.json @@ -0,0 +1,69 @@ +{ + "version": "2.0", + "routeKey": "$default", + "rawPath": "/path/to/resource", + "rawQueryString": "parameter1=value1¶meter1=value2¶meter2=value", + "cookies": [ + "cookie1", + "cookie2" + ], + "headers": { + "Header1": "value1", + "Header2": "value1,value2" + }, + "queryStringParameters": { + "parameter1": "value1,value2", + "parameter2": "value" + }, + "requestContext": { + "accountId": "123456789012", + "apiId": "api-id", + "authentication": { + "clientCert": { + "clientCertPem": "CERT_CONTENT", + "subjectDN": "www.example.com", + "issuerDN": "Example issuer", + "serialNumber": "a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1", + "validity": { + "notBefore": "May 28 12:30:02 2019 GMT", + "notAfter": "Aug 5 09:36:04 2021 GMT" + } + } + }, + "authorizer": { + "jwt": { + "claims": { + "claim1": "value1", + "claim2": "value2" + }, + "scopes": [ + "scope1", + "scope2" + ] + } + }, + "domainName": "id.execute-api.us-east-1.amazonaws.com", + "domainPrefix": "id", + "http": { + "method": "POST", + "path": "/path/to/resource", + "protocol": "HTTP/1.1", + "sourceIp": "192.168.0.1/32", + "userAgent": "agent" + }, + "requestId": "id", + "routeKey": "$default", + "stage": "$default", + "time": "12/Mar/2020:19:03:58 +0000", + "timeEpoch": 1583348638390 + }, + "body": "eyJ0ZXN0IjoiYm9keSJ9", + "pathParameters": { + "StockID": "1" + }, + "isBase64Encoded": true, + "stageVariables": { + "stageVariable1": "value1", + "stageVariable2": "value2" + } +} diff --git a/python-test-samples/hexagonal-architectures/tests/integration/__init__.py b/python-test-samples/hexagonal-architectures/tests/integration/__init__.py new file mode 100644 index 00000000..e69de29b diff --git a/python-test-samples/hexagonal-architectures/tests/integration/test_api_gateway.py b/python-test-samples/hexagonal-architectures/tests/integration/test_api_gateway.py new file mode 100644 index 00000000..7aba12c1 --- /dev/null +++ b/python-test-samples/hexagonal-architectures/tests/integration/test_api_gateway.py @@ -0,0 +1,117 @@ +""" +Integration Test + +Set the environment variable AWS_SAM_STACK_NAME +to match the name of the stack you will test + +AWS_SAM_STACK_NAME= python -m pytest -s tests/integration -v +""" +# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. +# SPDX-License-Identifier: MIT-0 + +import os +from decimal import Decimal +from unittest import TestCase +import boto3 +import requests + +class TestApiGateway(TestCase): + """ + Integration test Class + """ + + api_endpoint: str + aws_region = os.environ.get("AWS_DEFAULT_REGION") or "us-east-1" + + @classmethod + def get_stack_name(cls) -> str: + """ + Return the stack name + """ + stack_name = os.environ.get("AWS_SAM_STACK_NAME") + if not stack_name: + raise LookupError( + "Cannot find env var AWS_SAM_STACK_NAME. \n" + "Please setup this environment variable with the stack name where we are running integration tests." + ) + + return stack_name + + def setUp(self) -> None: + """ + Based on the provided env variable AWS_SAM_STACK_NAME, + We use the cloudformation API to retrieve the StockConverterApi URL and the DynamoDB Table Name + We also seed the DynamoDB Table for the test + """ + stack_name = TestApiGateway.get_stack_name() + + client = boto3.client("cloudformation") + print(stack_name) + try: + response = client.describe_stacks(StackName=stack_name) + except Exception as err: + raise LookupError( + f"Cannot find stack {stack_name}. \n" f'Please make sure stack with the name "{stack_name}" exists.' + ) from err + + # StockConverterApi + print(stack_name, response) + stack_outputs = response["Stacks"][0]["Outputs"] + api_outputs = [output for output in stack_outputs if output["OutputKey"] == "StockConverterApi"] + self.assertTrue(api_outputs, f"Cannot find output StockConverterApi in stack {stack_name}") + self.api_endpoint = api_outputs[0]["OutputValue"] + + # CurrenciesTableName + currencies_dynamodb_outputs = [output for output in stack_outputs if output["OutputKey"] == "CurrenciesTableName"] + self.assertTrue(currencies_dynamodb_outputs, f"Cannot find output DynamoDBTableName in stack {stack_name}") + self.currencies_dynamodb_table_name = currencies_dynamodb_outputs[0]["OutputValue"] + + # Seed the Currencies DynamoDB Table with Test Data + dynamodb_resource = boto3.resource("dynamodb", region_name = self.aws_region) + currencies_dynamodb_table = dynamodb_resource.Table(name=self.currencies_dynamodb_table_name) + currencies_dynamodb_table.put_item(Item={"CURRENCY": "USD", + "Rate": Decimal("1.31")}) + currencies_dynamodb_table.put_item(Item={"CURRENCY": "CAD", + "Rate": Decimal("1.41")}) + currencies_dynamodb_table.put_item(Item={"CURRENCY": "AUD", + "Rate": Decimal("1.51")}) + + # StocksTableName + stocks_dynamodb_outputs = [output for output in stack_outputs if output["OutputKey"] == "StocksTableName"] + self.assertTrue(stocks_dynamodb_outputs, f"Cannot find output DynamoDBTableName in stack {stack_name}") + self.stocks_dynamodb_table_name = stocks_dynamodb_outputs[0]["OutputValue"] + + # Seed the Currencies DynamoDB Table with Test Data + dynamodb_resource = boto3.resource("dynamodb", region_name = self.aws_region) + stocks_dynamodb_table = dynamodb_resource.Table(name=self.stocks_dynamodb_table_name) + stocks_dynamodb_table.put_item(Item={"STOCK_ID": "1","Value": 3}) + + + def tearDown(self) -> None: + """ + # For tear-down, remove any data injected for the tests + """ + dynamodb_resource = boto3.resource("dynamodb", region_name = self.aws_region) + currencies_dynamodb_table = dynamodb_resource.Table(name=self.currencies_dynamodb_table_name) + + for currency_id in ["AUD", "USD", "CAD"]: + currencies_dynamodb_table.delete_item(Key={"CURRENCY":currency_id}) + + stocks_dynamodb_table = dynamodb_resource.Table(name=self.stocks_dynamodb_table_name) + stocks_dynamodb_table.delete_item(Key={"STOCK_ID":"1"}) + + def test_api_gateway_200(self): + """ + Call the API Gateway endpoint and check the response for a 200 + """ + print(self.api_endpoint) + print("URL", self.api_endpoint.replace("{stock_id}","1")) + response = requests.get(self.api_endpoint.replace("{stock_id}","1")) + self.assertEqual(response.status_code, requests.codes.ok) + + def test_api_gateway_404(self): + """ + Call the API Gateway endpoint and check the response for a 404 (id not found) + """ + response = requests.get(self.api_endpoint.replace("{stock_id}","2")) + self.assertEqual(response.status_code, requests.codes.not_found) diff --git a/python-test-samples/hexagonal-architectures/tests/unit/__init__.py b/python-test-samples/hexagonal-architectures/tests/unit/__init__.py new file mode 100644 index 00000000..e69de29b diff --git a/python-test-samples/hexagonal-architectures/tests/unit/mock_test.py b/python-test-samples/hexagonal-architectures/tests/unit/mock_test.py new file mode 100644 index 00000000..afa4af4e --- /dev/null +++ b/python-test-samples/hexagonal-architectures/tests/unit/mock_test.py @@ -0,0 +1,136 @@ +""" +Unit Test +""" +# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. +# SPDX-License-Identifier: MIT-0 + +from decimal import Decimal +from os import environ +import json +from unittest import TestCase +from typing import Any, Dict +import yaml +import boto3 +import moto + + +# Import the handler under test +from src import app + +# Mock the DynamoDB Service during the test +@moto.mock_dynamodb + +class TestSampleLambdaWithDynamoDB(TestCase): + """ + Unit Test class for src/app.py + """ + + def setUp(self) -> None: + """ + Test Set up: + 1. Create the lambda environment variable STOCKS_DB_TABLE and CURRENCIES_DB_TABLE + 2. Build DynamoDB Tables according to the SAM template + 4. Populate DynamoDB Data into the Tables for test + """ + + # Create a name for a test table, and set the environment + self.test_stocks_table_name = "unit_test_stock_table_name" + environ["STOCKS_DB_TABLE"] = self.test_stocks_table_name + + # Create a mock table using the definition from the SAM YAML template + # This simple technique works if there are no intrinsics (like !If or !Ref) in the + # resource properties for KeySchema, AttributeDefinitions, & BillingMode. + sam_template_table_properties = \ + self.read_sam_template()["Resources"]["StocksTable"]["Properties"] + self.mock_dynamodb = boto3.resource("dynamodb") + self.mock_dynamodb_table = self.mock_dynamodb.create_table( + TableName = self.test_stocks_table_name, + KeySchema = sam_template_table_properties["KeySchema"], + AttributeDefinitions = sam_template_table_properties["AttributeDefinitions"], + BillingMode = sam_template_table_properties["BillingMode"] + ) + + # Populate data for the tests + self.mock_dynamodb_table.put_item(Item={ + "STOCK_ID": "1", + "Value": 3}) + + # Create a name for a test table, and set the environment + self.test_currencies_table_name = "unit_test_currencies_table_name" + environ["CURRENCIES_DB_TABLE"] = self.test_currencies_table_name + + # Create a mock table using the definition from the SAM YAML template + # This simple technique works if there are no intrinsics (like !If or !Ref) in the + # resource properties for KeySchema, AttributeDefinitions, & BillingMode. + sam_template_table_properties = \ + self.read_sam_template()["Resources"]["CurrenciesTable"]["Properties"] + self.mock_dynamodb = boto3.resource("dynamodb") + self.mock_currencies_table = self.mock_dynamodb.create_table( + TableName = self.test_currencies_table_name, + KeySchema = sam_template_table_properties["KeySchema"], + AttributeDefinitions = sam_template_table_properties["AttributeDefinitions"], + BillingMode = sam_template_table_properties["BillingMode"] + ) + + # Populate data for the tests + self.mock_currencies_table.put_item(Item={ + "CURRENCY": "USD", + "Rate": Decimal("1.31")}) + self.mock_currencies_table.put_item(Item={ + "CURRENCY": "CAD", + "Rate": Decimal("1.41")}) + self.mock_currencies_table.put_item(Item={ + "CURRENCY": "AUD", + "Rate": Decimal("1.51")}) + def tearDown(self) -> None: + """ + For teardown, remove the mocked table & environment variable + """ + self.mock_dynamodb_table.delete() + del environ['STOCKS_DB_TABLE'] + + def read_sam_template(self, sam_template_fn : str = "template.yaml" ) -> dict: + """ + Utility Function to read the SAM template for the current project + """ + with open(sam_template_fn, "r",encoding="utf-8") as fptr: + template =fptr.read().replace("!","") # Ignoring intrinsic tags + return yaml.safe_load(template) + + def load_test_event(self, test_event_file_name: str) -> Dict[str, Any]: + """ + Load a sample event from a file + """ + with open(f"tests/events/{test_event_file_name}.json","r",encoding="utf-8") as fptr: + event = json.load(fptr) + return event + + + def test_lambda_handler_happy_path(self): + """ + Happy path test where the stock ID exists in the DynamoDB Table + + Since the environment variable STOCKS_DB_TABLE and CURRENCIES_DB_TABLE + are set and DynamoDB is mocked for the entire class, this test will + implicitly use the mocked DynamoDB table we created in setUp. + """ + + test_event = self.load_test_event("testevent") + test_return = app.lambda_handler(event=test_event,context=None) + self.assertEqual( test_return["statusCode"] , 200) + expected = '{"message": {"stock": "1", "values": {"EUR": 3.0, "USD": 3.93, "CAD": 4.23, "AUD": 4.53}}}' + self.assertEqual( test_return["body"] , expected) + + def test_lambda_handler_failure(self): + """ + Failure Test where the stock ID does not exist in the DynamoDB Table + + Since the environment variable STOCKS_DB_TABLE and CURRENCIES_DB_TABLE + are set and DynamoDB is mocked for the entire class, this test will + implicitly use the mocked DynamoDB table we created in setUp. + """ + + test_event = self.load_test_event("testevent-failure") + test_return = app.lambda_handler(event=test_event,context=None) + self.assertEqual( test_return["statusCode"] , 404) + self.assertEqual( test_return["body"], "Stock not found") diff --git a/python-test-samples/hexagonal-architectures/tests/unit/requirements.txt b/python-test-samples/hexagonal-architectures/tests/unit/requirements.txt new file mode 100644 index 00000000..89c643bb --- /dev/null +++ b/python-test-samples/hexagonal-architectures/tests/unit/requirements.txt @@ -0,0 +1,7 @@ +aws-xray-sdk +aws_lambda_powertools +fastjsonschema +boto3 +pytest +moto +pytest-cov \ No newline at end of file