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AWS SAM

Updated Jul 26, 2020 ·
NOTES

This is not an exhaustive documentation of all the existing AWS Services. These are summarized notes that I used for the AWS Certifications.

To see the complete documentation, please go to: AWS documentation

AWS Serverless Application Model (SAM)​

AWS Serverless Application Model (SAM) is framework for developing and deploying serverless applications in AWS.

  • All the configuration for SAM is stored in YAML code.
  • Deploy the services automatically (similar to CloudFormation).
  • Help to run Lambda, API Gateway and DynamoDB locally.
  • SAM can used CodeDeploy for quick deployments and pipelines.

The configurations can contain settings for:

  • Lambda Functions
  • DynamoDB tables
  • API Gateway
  • Cognito User Pools

Here’s an example of a basic serverless application. This application processes requests to get all items from a database through an HTTP request.

It consists of the following parts:

  • A function that contains the logic to process the request.

  • An HTTP API to serve as communication between the client (requestor) and the application.

  • A database to store items.

  • Permissions for the application to run securely.

This application's infrastructure code can be defined in the following AWS SAM template:

AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31
Resources:
  getAllItemsFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/get-all-items.getAllItemsHandler
      Runtime: nodejs12.x
      Events:
        Api:
          Type: HttpApi
          Properties:
            Path: /
            Method: GET
    Connectors:
      MyConn:
        Properties:
        Destination:
          Id: SampleTable
          Permissions:
            - Read
  SampleTable:
    Type: AWS::Serverless::SimpleTable

To learn more, please see What is the AWS Serverless Application Model (AWS SAM)?