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Serverless Architecture

Serverless computing simply means using existing, auto-scaling cloud services to achieve system behaviours. In other words, I don't manage any servers or docker containers. I don't set up networks or manage operation (ops). I merely provide the serverless solution my recipe and it handles creation of any needed assets and performs the required computational process.

  1. Containerisation - Gives a uniform development environment that is independent of the systems the code is running on.

  2. Microservices architecture - Developers are able to quickly understand a certain module without going through the whole code base.

    • Also changing something on one part of the code doesn't effect the other parts of the product.
    • Apis are used to communicate between different modules
    • Messaging Queue is used for inter-modules communication (AMQP, MQTT, etc.)

  3. Event Based Architecture

    • Events are triggered when some event happens
    • Example - When a photo is uploaded automatically trigger the thumbnail creation function.
    • Functions subscribe to events, and based on that event react accordingly.

  4. AWS Lambda

  5. AWS CloudFunctions

  6. AWS CloudFormation (for provisioning)

Stateless Services​

  • Not a cache or a database
  • Frequently accessed metadata
  • No instance affinity
  • Loss of a node is a non-event

Durable Functions​

Durable Functionsis an extension of Azure Functions that lets you write stateful functions in a serverless compute environment. The extension lets you define stateful workflows by writing orchestrator functions and stateful entities by writing entity functions using the Azure Functions programming model. Behind the scenes, the extension manages state, checkpoints, and restarts for you, allowing you to focus on your business logic.

https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-overview

AWS SAM (Serverless Application Model)​

The AWS Serverless Application Model (SAM) is an open-source AWS framework that allows developers to more efficiently build serverless applications. It includes SAM CLI options for local testing and integrates with various AWS serverless tools.

https://www.toptal.com/aws/typescript-jest-aws-sam-tutorial

References​

https://cloudplatform.googleblog.com/2018/04/Cloud-native-architecture-with-serverless-microservices-the-Smart-Parking-story.html

SE Radio - 320: Serverless Applications - Kishore Bhatia with Nate Taggart

https://www.freecodecamp.org/news/complete-back-end-system-with-serverless