Hands-On Serverless Computing

Three Lambda functions

The following SAM template creates three AWS Lambda functions that generate different resolutions for the photo that was uploaded to the S3 bucket. If you look at the template, all three AWS Lambda function events are configured to the same Amazon SNS topic:

ThumbNailGenerationFunction: Type: AWS::Serverless::Function Properties: CodeUri: . Handler: index.handler Runtime: nodejs8.10 Policies: - AmazonS3FullAccessPolicy Events: SNS1: Type: SNS Properties: Topic: Ref: PhotoUploadTopic IconGenerationFunction: Type: AWS::Serverless::Function Properties: CodeUri: . Handler: index.handler Runtime: nodejs8.10 Policies: - AmazonS3FullAccessPolicy Events: SNS1: Type: SNS Properties: Topic: Ref: PhotoUploadTopic HighResolutionGenerationFunction: ...