Lightning-fast feedback loops for developing and testing cloud apps

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Lightning-fast feedback loops for developing and testing cloud apps 19.09.2023 AWS Austria localstack.cloud

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Anca Ghenade - Developer Advocate - anca.ghenade@localstack.cloud @tinyg210

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How does one go around developing applications using AWS services?

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A Story About Cloud Development

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1. The Software Ninjas are tasked with developing a new web application on AWS Cloud

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2. Developing on a local machine, they soon ﬁnd out that there are lots of dependencies with resources in the cloud

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3. They realize that the dev & test loop is extremely slow and tedious. Every local change needs to be packaged and uploaded to the cloud for testing.

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4. Now a Software Ninja has a red build on their feature branch, but can’t efficiently test and debug their code in the CI/CD pipeline.

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5. The whole team is using Git ﬂow for development - one CI build per feature branch. There is an explosion of different environments required for development (branches x developers).

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6. The Ninja manager approaches the team and complains that AWS dev/test resources are not being cleaned up properly causing cost spikes.

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So things are kind of… complicated. 󰤆

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HIDDEN

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Title: Complexity and Risk - Setting up an AWS developer sandbox. - Making sure you have the right permissions to not blow up resources. - “Who is worthy of AWS access?”

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Title: The Fear That someone leaves resources on overnight… You get an email from your boss’ boss’ boss the next morning.

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Title: Running out of Time - Your application is never fully tested before release. - AWS is slow to create and handle all those resources.

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Title: Wasted Time & Money Disaster recovery testing was not done thoroughly dues to costs. You think you’re safe, but you’re not.

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Title: Never growing It’s hard to learn something new when you don’t get your hands dirty.

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What about testing your AWS-powered applications?

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How much of your system you can test Cloud emulation Full cloud emulation with service integration Staging environments Highest ﬁdelity because it actually runs in the cloud Mocking Mock out cloud APIs What are our options in terms of testability? 3 4 Service emulation Replace individual services with local versions 2 1

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What is LocalStack and how can it help you? A fully functional local cloud stack that was born out of these exact concerns.

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● Enables a highly eﬃcient dev & test loop for cloud apps ● Ships as a Docker image, easy to install and start up ● Support for 90-ish services (and growing): ○ compute (Lambda, ECS, EKS) ○ various databases (DynamoDB, RDS) ○ messaging (SQS, Kinesis, MSK) ○ some sophisticated/exotic APIs (Athena, Glue) ● CI integrations & advanced collaboration features ○ redeﬁning the way cloud apps are developed across the lifecycle!

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https://github.com/localstack-samples/sample-shipment-list-demo-lambda-dynamodb-s3

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Scenario 1 Scenario 2

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“Your application won’t even know the difference”

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Full video: We put emulation to the test.

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Source: https://docs.localstack.cloud/user-guide/integrations/

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Testcontainers

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The Developer Hub

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AWS Parity ● AWS Server Framework ○ weekly automated updates of API stubs ○ makes heavy use of botocore ● Snapshot testing ● Metrics collection to track test coverage

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