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DESIGN.md

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Overview

SAM is called by the CloudFormation Service. CloudFormation recognises the Transform: AWS::Serverless-2016-10-31 header and invokes the SAM translator. This will then take your SAM template and expand it into a full fledged CloudFormation Template. The CloudFormation Template that is produced from SAM is the template that is executed by CloudFormation to create/update/delete AWS resources.

The entry point for SAM starts in the Translator class here, where SAM iterates through the template and acts on AWS::Serverless::* Type Resources.

Design decisions

Document design decisions here.

CloudWatchLogs Event Source

LogGroupName

For now we have decided LogGroupName should be a required property for simplicity. A future enhancement could make this optional and create a new CloudWatch Log Group when not provided. Users could Ref the resource if we exposed/documented the resource naming convention.

FilterPattern

Decided FilterPattern should be a required property so as not to provide a footgun to users. If this were to default to "", noisy logs could invoke hundreds/thousands of Lambda functions in short periods of time.