csharp

The Scheduled Lambda

This is an example CDK stack demonstrating how to use AWS EventBridge to invoke a Lambda function on a schedule or using a cron expression. The Lambda function will then write the request ID to a DynamoDB table.

WARNING: By default the EventBridge rule has been configured with a rate of 2 minutes, so you are able to quickly see the result of this example. I would strongly recommend destroying the stack using cdk destroy TheScheduledLambdaStack so that the scheduled run does not lead to AWS billing you for function invocations.

More information on schedule expressions for AWS EventBridge to change the run frequency of this project can be found here.

Useful commands

• dotnet build src compile this app
• cdk deploy deploy this stack to your default AWS account/region
• cdk diff compare deployed stack with current state
• cdk synth emits the synthesized CloudFormation template

Deploy with AWS Cloud9

• Create an Ubuntu AWS Cloud9 EC2 development environment
• Add the Microsoft repository

  wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
  

  sudo dpkg -i packages-microsoft-prod.deb
  

• Install the .NET Core SDK

  sudo apt-get update; \
  sudo apt-get install -y apt-transport-https && \
  sudo apt-get update && \
  sudo apt-get install -y dotnet-sdk-3.1
  

• Clone the CDK Patterns repo

  git clone https://github.com/cdk-patterns/serverless.git
  

• Change directory

  cd serverless/the-scalable-webhook/csharp
  

• Build the project to see if .NET Core has been setup correctly (optional)

  dotnet build src
  

• Deploy the stack

  cdk deploy