AWS SAM Lambda Function

© Israel Pereira Tavares da Silva

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. During deployment, SAM transforms and expands the SAM syntax into AWS CloudFormation syntax, enabling you to build serverless applications faster.

• SAM
• Lambda

Setup

Clone the project:

> git clone https://github.com/israelptdasilva/AWS-SAM-Lambda
> cd AWS-SAM-Lambda

Conda

You may want to use conda or another environment manager to have a separate environment to install awscli and aws-sam-cli.

> conda create -n lambda
> conda activate lambda
> conda install -c conda-forge awscli
> pip install aws-sam-cli

After installing awscli and aws-sam-cli you'll need to configure awscli with your access keys:

> aws configure

Docker

It is necessay to have Docker installed if you want o test the lambda function locally.

Basic SAM Usage

Run Locally

Executing the command bellow builds a docker image (golang) in which the function will be ran in.

> sam local invoke GoLambdaFunction -e event.json

Validate & Deploy

A successfull deploy will create a S3 bucket with the lambda function, the lambda function itself, a cloudformation stack and the necessay roles.

> sam validate
> sam build
> sam deploy --guided (or just sam deploy)

Delete Stack

Delete the deployed stack if you don't want to keep it around anymore.

> sam delete

Quem florestas e mares foi rasgando e entre raios, pedradas e metralhas, ficou gemendo, mas ficou sonhando! (João da Cruz e Sousa)