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I am playing around with the Cloudformation Serverless Transformation, and am trying to figure out how and when to use AWS::Serverless::Function or AWS::Lambda::Function. For some reason the Lambda version is used for SAM examples in AWS. This is very confusing. SAM github. And then there is also the servlerless framework itself which is really a nodejs framework. All this stuff is getting me extremely confused.
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Lambda Functions vs. Lambda Applications. A Lambda function is a piece of code (managed by AWS) that is executed whenever it is triggered by an event from an event source. A Lambda application is a cloud application that includes one ore more Lambda functions, as well as potentially other types of services.
AWS Lambda is a serverless compute service that runs your code in response to events and automatically manages the underlying compute resources for you. These events may include changes in state or an update, such as a user placing an item in a shopping cart on an ecommerce website.
Serverless on AWS. AWS offers technologies for running code, managing data, and integrating applications, all without managing servers. Serverless technologies feature automatic scaling, built-in high availability, and a pay-for-use billing model to increase agility and optimize costs.
The AWS Serverless Application Model (SAM) is an open-source framework for building serverless applications. It provides shorthand syntax to express functions, APIs, databases, and event source mappings. With just a few lines per resource, you can define the application you want and model it using YAML.
First of all, let me explain each of these.
AWS Serverless Stack - A combination of AWS offered serverless technologies including API Gateway, Lambda, S3 and etc.
When Lambda was initially introduced it was challenging to develop Serverless applications using these technologies using Cloudformation. The problem was due to the complexity of writing Cloudformation for API Gateway and Lambda.
This is where Serverless Framework came in.
Serverless Framework - An Open Source DevOps framework which simplifies defining API Gateway and Lambda using a simple file called serverless.yml. Since Serverless Framework uses conventions over configurations, it required only a few lines of code to define Lambda, API Gateway and etc. Underneath Serverless Framework generates Cloudformation based on whats defined in serverless.yml. In addition, Serverless Framework supported Multiple Cloud Providers.
Later AWS introduced their own simplified scripting language called AWS SAM(Note: AWS SAM is not a Framework like Serverless with plugins and extension support as of now) to reduce the complexity in defining CloudFormation as an alternative to Serverless Framework.
AWS::Lambda::Function is the Cloudformation syntax to define a Lambda function.
AWS::Serverless::Function is the AWS SAM syntax to define a Lambda function which internally creates a Lambda function in Cloudformation (AWS::Lambda::Function) and related resources by convention when executing AWS SAM.
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