This document provides an overview of AWS and serverless computing using AWS Lambda. It discusses the history of AWS and services like S3, EC2, and Azure. It then describes AWS Lambda and how it allows code to be executed in response to events without managing infrastructure. The document demonstrates building an S3 bucket and Lambda function triggered by S3 events. It also discusses testing Lambda functions, API Gateway for building APIs, and hosting ASP.Net applications on Lambda.

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.NET Development on the AWS Platform
Vogon Poetry – May 30, 2018

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What is AWS

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Brief History
 Started with S3 in March 2006
 Shortly there after added SQS (which really wasn’t a queue)
 August 2006 starts rollout of EC2 but isn’t ready for public until August
2007
 April 2008 Google launches App Engine
 February 2010 Microsoft launches Azure
 Along new services offerings are added. As of today there 19 different
top-level categories of services and more than 90 different services to use

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There is no cloud or
computer

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AWS Lambda
 Lambda is a compute service (Serverless) that executes code when needed with
automatic scaling
 Triggered by events
 File events in S3 (Add, Delete)
 Changes in DynamoDB
 Data Stream processing
 API Gateway Requests
 Functions can be written in Node, Java, C#, Go, and Python
 No access to underlying system
 Amazon manages OS and language runtime
 Use EC2 or Elastic Beanstalk if you need more control.

6. Demo of Building an S3 bucket and a Lambda
trigger

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Lambda Testing
 Easy to unit and integration test if using Visual Studio
 See logs and events, throttle memory, add timeouts, all from VS
 Or, since 2017, test using the AWS Serverless Application Model (AWS
SAM) CLI by deploying the lambda to a local environment. This was
handy using VS Code but I found the tools in full VS to be the better
option
 https://github.com/awslabs/serverless-application-model

8. Demo

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API Gateway - Proxies
 Configured on a per method basis
 Can redirect to hit a lambda function
 Can hit another API
 Can forward credentials from initial call
 Or, authenticate in another way (e.g., another lambda, AWS Cognito
User Pools)

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API Gateway – Data
Mapping
 Request body and headers can be passed along or transformed
 Incoming and outgoing
 Models and mapping templates can be set up to transform data
 Other lambdas may be hit before passing along or returning data to
transform
 Custom responses can be created and returned per HTTP status code
 e.g. “400 - Bad Request - That request was bad and you should feel
bad”

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API Gateway -
Management
 Fast and simple deployment to configured environments (PROD, QA,
DEMO, DEV, etc)
 Environments can be reused or created ad-hoc at the time deployment
 Easy to manage documentation for each API method
 Easy to export documentation for the full API
 Swagger
 Postman
 Or conversely, an API Gateway can be created via import from a
Swagger export
 The difficult part – finding anything in the API Gateway UI.

12. Demo

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Bonus Time
 Logging to CloudWatch Logs
 Back in January, Amazon made a set of packages and templates
available to let you run ASP.Net Core 2.0 in Lambda
 This means you don’t have to even set up Elastic Beanstalk to be able
to host your ASP.Net Core website.
 There is a template to do all of the CloudFormation (provisioning) as
part of the project
 AWS has command line tools (Because Chad)

14. Demo

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Resources and
References
 https://aws.amazon.com/sdk-for-net/
 https://docs.aws.amazon.com/lambda/latest/dg/welcome.html
 https://twitter.com/awsfornet
 https://read.acloud.guru/comparing-aws-lambda-performance-of-node-js-python-
java-c-and-go-29c1163c2581
 https://github.com/awslabs/serverless-application-model
 https://aws.amazon.com/blogs/developer/serverless-asp-net-core-2-0-
applications/
 https://marketplace.visualstudio.com/items?itemName=AmazonWebServices.A
WSToolkitforVisualStudio2017
 https://aws.amazon.com/cli/