Serverless vs SAM Paolo Ferretti - Road to Coderful 

Paolo Ferretti Senior Backend Developer @iGeniusAI AWS Certified Solutions Architect - Associate @paoferretti 

Not Abraham Lincoln “Give me six hours to chop down a tree and I will spend the first four sharpening the axe” 

Warning: opinions ahead! 

Agenda Serverless Framework AWS SAM Installation Community Setup Base project structure Deploy Removal Base lambda definition Resurces definition Composition with other stacks Capabilities Tests Documentation Final result 

Installation curl -o- -L https://slss.io/install | bash choco install serverless Serverless framework AWS SAM MacOS/Linux MacOS/Linux Windows Windows brew tap aws/tap brew install aws-sam-cli Windows Installer (MSI) 

9 9 Installation score Serverless framework AWS SAM 

Community Google Trends Serverless Framework AWS SAM 

Community Stackoverflow | GitHub 

10 7 Community score Serverless framework AWS SAM 

Setup Serverless ⟩ serverless Serverless: No project detected. Do you want to create a new one? Yes Serverless: What do you want to make? AWS Node.js ❯ AWS Python Other Serverless: What do you want to call this project? Project successfully created in 'MyServerlessProject' folder. You can monitor, troubleshoot, and test your new service with a free Serverless account. Serverless: Would you like to enable this? (Y/n) You can run the “serverless” command again if you change your mind later. 

Setup AWS SAM ⟩ sam init Which template source would you like to use? 1 - AWS Quick Start Templates 2 - Custom Template Location Choice: 1 Which runtime would you like to use? 1 - nodejs12.x 2 - python3.8 3 - ruby2.7 4 - go1.x 5 - java11 6 - dotnetcore3.1 7 - nodejs10.x 8 - python3.7 9 - python3.6 10 - python2.7 11 - ruby2.5 12 - java8.al2 13 - java8 14 - dotnetcore2.1 Runtime: 2 Project name [sam-app]: my-sam-app Cloning app templates from https://github.com/awslabs/aws-sam-cli-app-templates.git AWS quick start application templates: 1 - Hello World Example 2 - EventBridge Hello World 3 - EventBridge App from scratch (100+ Event Schemas) 4 - Step Functions Sample App (Stock Trader) 5 - Elastic File System Sample App Template selection: 1 ----------------------- Generating application: ----------------------- Name: my-sam-app Runtime: python3.8 Dependency Manager: pip Application Template: hello-world Output Directory: . Next steps can be found in the README file at ./my-sam-app/README.md 

8 10 Setup score Serverless framework AWS SAM 

Base project structure Serverless Framework 

Base project structure AWS SAM 

7 10 Base project structure score Serverless framework AWS SAM 

Deploy Serverless framework 

Deploy AWS SAM 

10 10 Deploy score Serverless framework AWS SAM 

Removal Serverless framework 

Removal AWS SAM Only using Cloudformation We must empty an S3 bucket 

10 5 Removal score Serverless framework AWS SAM 

Base lambda definition Serverless framework AWS SAM Resources: HelloWorldFunction: Type: AWSjkServerlessjkFunction Properties: CodeUri: hello_world/ Handler: app.lambda_handler Runtime: python3.8 Events: HelloWorld: Type: Api Properties: Path: /hello Method: get provider: name: aws runtime: python3.8 functions: hello-world: handler: hello_world.lambda_handler events: - httpApi: method: GET path: /hello_world 

10 10 Base lambda definition score Serverless framework AWS SAM 

Both tools use CloudFormation syntax to define resources Resources definition 

8 10 Resources definition score Serverless framework AWS SAM 

Composition with other stacks Serverless framework AWS SAM • Parameters support • Possibility to reference resources from external stacks • Parameters support • Possibility to reference resources from external stacks 

10 10 Composition with other stacks score Serverless framework AWS SAM 

Capabilities Serverless framework AWS SAM • Plugins ecosystem (https:// www.serverless.com/plugins/) • Multi-cloud support • Can load remote logs • Native integration with step functions • Good integration with AWS services • Can load remote logs 

8 7 Capabilities score Serverless framework AWS SAM 

Tests Serverless framework AWS SAM • Lack of default test structure • Run lambda in local environment • Invoke remote lambda • Default test structure • Run lambda in local Docker container • Run a local version of API Gateway • Event payload generator 

6 10 Tests score Serverless framework AWS SAM 

Documentation Serverless framework AWS SAM • Comprehensive documentation (https:// www.serverless.com/framework/docs/) • A lot of examples (https:// www.serverless.com/examples/) • Dozens of tutorials (https:// www.serverless.com/blog/category/guides- and-tutorials/) • Official blog (https://www.serverless.com/ blog/) • Comprehensive documentation (https:// docs.aws.amazon.com/serverless- application-model/index.html) • Not many examples • Dedicated tag on AWS Compute blog (https://aws.amazon.com/blogs/compute/ tag/aws-sam-cli/) 

10 8 Documentation score Serverless framework AWS SAM 

Final results Serverless Framework AWS SAM Installation 9 9 Community 10 7 Setup 8 10 Base project structure 7 10 Deploy 10 10 Removal 10 5 Base lambda definition 10 10 Resurces definition 8 10 Composition with other stacks 10 10 Capabilities 8 7 Tests 6 10 Documentation 10 8 Final result 106 106 

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