Building an AWS SAM(Serverless Application Model) Project

AWS SAM (Serverless Application Model) is a framework that simplifies the building, deploying, and managing of serverless applications on AWS. It uses a YAML-based syntax to define the resources your application needs, such as Lambda functions, API Gateway endpoints, and DynamoDB tables. SAM allows developers to define their application's infrastructure and logic in a single file, making it easier to manage, test, and deploy serverless applications.

AWS SAM supports a wide range of programming languages for serverless applications, including Python, Node.js, Java, .NET, Go, Ruby, and PHP. This versatility allows developers to leverage their preferred languages and existing codebases when building serverless applications on AWS.

• SAM is a framework that manages your infrastructure and application deployment, allowing you to choose the language for your application code independently within your project structure.
• When setting up a SAM project, you don't directly select a language.

AWS SAM (Serverless Application Model) template

An AWS SAM (Serverless Application Model) template is a YAML or JSON document that defines the infrastructure and resources for a serverless application deployed on AWS. It simplifies the process of defining and deploying serverless applications by allowing you to specify resources like AWS Lambda functions, API Gateway endpoints, and DynamoDB tables in a declarative way. This makes it easier to manage and update your applications, as you can simply modify the template and redeploy your entire infrastructure with minimal effort.

AWS SAM template example

AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31
Resources:
  getAllItemsFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/get-all-items.getAllItemsHandler
      Runtime: nodejs20.x
      Events:
        Api:
          Type: HttpApi
          Properties:
            Path: /
            Method: GET
    Connectors:
      MyConn:
        Properties:
          Destination:
            Id: SampleTable
          Permissions:
            - Read
  SampleTable:
    Type: AWS::Serverless::SimpleTable

AWS SAM CLI

AWS SAM CLI (Serverless Application Model Command Line Interface) is a command-line tool designed to help developers build, test, package, and deploy serverless applications on AWS. It provides a unified interface for working with AWS Lambda functions, API Gateway endpoints, and other serverless resources, making it easier to manage and deploy complex serverless architectures. SAM CLI supports various programming languages, simplifies the development process, and enables efficient local testing and debugging of serverless applications before deploying them to AWS. 
 
To install the AWS SAM CLI:

sudo pip3 install aws-sam-cli 

Verify the Installation:

sam --version

Run the "Hello World" example:

sam init --runtime nodejs14.x --name hello-world
cd hello-world
sam build
sam local invoke -e

Additional Configuration:

• Configure AWS Credentials: Ensure you have configured your AWS credentials for access to your account.
• Configure your AWS Region: Set the AWS region you want to work with using the following command:

aws configure

Use the SAM CLI:
Now you can use the SAM CLI to work with your AWS Serverless Application Model (SAM) projects. Some common commands include:

• sam init: Initialize a new SAM project.
• sam build: Build your project.
• sam local invoke: Invoke your functions locally.
• sam deploy: Deploy your application to AWS.
• sam logs: View logs for your deployed functions.