Developers are increasingly looking to modernize their .NET applications on AWS and use the AWS development tools for .NET to quickly get started and manage their applications. In this session, we do a deep dive and demonstrate the latest updates to .NET for serverless development and the AWS SDK and tools for .NET to make development easier, more powerful, and productive.

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Developing serverless applications
with .NET using AWS SDK & tools
Steve Roberts
Senior Technical Evangelist
Amazon Web Services
M A D 3 1 1

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What is CloudMosaic?
+ =

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What does the application illustrate?
• Developing modern, serverless .NET applications on AWS
• Using the AWS SDK and tools for .NET to work with AWS services
• AWS Lambda
• AWS Batch
• AWS Step Functions
• Amazon DynamoDB
• Amazon Cognito
• AWS Systems Manager
• Deploying to services using the tools that you are familiar with
• AWS Toolkit for Visual Studio
• AWS extensions for the dotnet CLI

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Overall architecture
Tile gallery
Tile data

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What does tile ingestion do?
• It accepts a user’s .zip file that contains multiple images
• The .zip file is unpacked, and each image is analyzed to determine the average
color
• Each image is then resized and saved as a tile in a named gallery

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How tile ingestion works

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Why did we choose AWS Batch?
• To take advantage of serverless
It manages the compute capacity for us
• Work can be queued for
asynchronous processing
Tile creation is not a time-critical task
• Cost savings
• No charge for idle compute environments
• Ability to use Amazon EC2 spot instances
Spot
instance(s)
On-demand
instance(s)

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Tile gallery ingestion review
• Using dead-letter queues (DLQs) to help detect and diagnose failures
• Using the AWS .NET Mock Lambda Test Tool to replay and debug failed events
in a DLQ
• Using AWS Batch

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What does the mosaic rendering workflow do?
• Accepts an image file from the user plus the name of a tile gallery
• Analyzes the image against the tile data in the gallery
• Builds a new mosaic image using the matched tiles

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How mosaic rendering works
Select
tiles
(F#)
Small
render
Medium
render
Large
render
Completion
notification
Color
map

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Mosaic rendering workflow review
• How to use AWS Step Functions to orchestrate a workflow
• Deploying multiple projects with a single serverless template
• Using the dotnet lambda CLI global tool to deploy

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What is the web front end responsible for?
• Allowing user registration and authentication
• Enabling signed-in users to
• Create new tile galleries
• Upload an image to create a mosaic

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How the front end works

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Web front end review
• Using high-level libraries from AWS to handle
• Identity
• Data protection (anti-forgery tokens)
• Application configuration at runtime
• Calling AWS Batch and AWS Step Functions from application code
• Deploying containers to AWS Fargate from Visual Studio
Can also use the dotnet ecs CLI tool

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25. Select
tiles
(F#)
Small
Medium
Large
NotifyMap
colors

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Useful links
AWS .NET blog: https://aws.amazon.com/blogs/developer/tag/net/
AWS .NET Twitter handle: @awsfornet
GitHub
AWS .NET home: https://github.com/aws/dotnet
AWS SDK for .NET: https://github.com/aws/aws-sdk-net
AWS Lambda for .NET Core: https://github.com/aws/aws-lambda-dotnet
AWS .NET Global Tools: https://github.com/aws/aws-extensions-for-dotnet-cli

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Additional extension libraries on GitHub
ASP.NET Core identity provider for Amazon Cognito:
https://github.com/aws/aws-aspnet-cognito-identity-provider
IConfiguration provider for AWS Systems Manager Parameter Store:
https://github.com/aws/aws-dotnet-extensions-configuration
ASP.NET Core DataProtection provider for AWS Systems Manager:
https://github.com/aws/aws-ssm-data-protection-provider-for-aspnet

28. Thank you!
S U M M I T © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Steve Roberts
Twitter: @bellevuesteve