Serverless Application Model (SAM) in AWS - Mini Project: Build & Apply

Build a Simple Serverless API with AWS SAM

📖 Scenario: You are creating a simple serverless API to handle user requests without managing servers. AWS SAM helps you define and deploy this API easily.

🎯 Goal: Build an AWS SAM template that defines a Lambda function triggered by an API Gateway HTTP GET request.

📋 What You'll Learn

Create a SAM template with AWS::Serverless::Function resource

Define a Lambda function named UserFunction

Set the runtime to python3.12

Add an API Gateway event trigger for HTTP GET on path /users

Specify the handler as app.lambda_handler

💡 Why This Matters

🌍 Real World

Serverless applications let you run code without managing servers. AWS SAM simplifies building and deploying these applications.

💼 Career

Understanding AWS SAM is essential for cloud developers and architects working with serverless architectures on AWS.

1

Create the basic SAM template structure

Create a SAM template starting with AWSTemplateFormatVersion set to '2010-09-09' and Transform set to 'AWS::Serverless-2016-10-31'. Also add an empty Resources section.

AWS

# Your code here

Need a hint?

Start with the SAM template header and an empty Resources dictionary.

2

Add the Lambda function resource

Inside Resources, add a resource named UserFunction of type AWS::Serverless::Function. Set the Runtime to python3.12 and the Handler to app.lambda_handler.

AWS

AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Resources:
  # Add UserFunction resource here

Need a hint?

Define the Lambda function resource with the correct runtime and handler.

3

Add API Gateway event trigger

Under UserFunction properties, add an Events section. Define an event named UserApi with Type set to Api. Set the Properties of this event to have Path as /users and Method as get.

AWS

AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Resources:
  UserFunction:
    Type: AWS::Serverless::Function
    Properties:
      Runtime: python3.12
      Handler: app.lambda_handler
      # Add Events section here

Need a hint?

Add the API Gateway event trigger under the Lambda function properties.

4

Add function memory size and timeout

Under UserFunction properties, add MemorySize set to 128 and Timeout set to 10 seconds to optimize the function configuration.

AWS

AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Resources:
  UserFunction:
    Type: AWS::Serverless::Function
    Properties:
      Runtime: python3.12
      Handler: app.lambda_handler
      Events:
        UserApi:
          Type: Api
          Properties:
            Path: /users
            Method: get
      # Add MemorySize and Timeout here

Need a hint?

Set memory size and timeout to control function resources and execution time.