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Project

This is a smaple project that represents a simple flow that is commonly used in real ones.

SQS serving as a event source for a lambda that does some processing and triggers a step function.

Ideally we are looking for ways to make the developer experience better for local and remote deployments.

Welcome to your CDK TypeScript project!

This is a blank project for TypeScript development with CDK.

The cdk.json file tells the CDK Toolkit how to execute your app.

Useful commands

  • npm run build compile typescript to js
  • npm run watch watch for changes and compile
  • npm run test perform the jest unit tests
  • 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

Demo Steps:

  • Synthesize the CDK Application using this command npm install && cdk synth --no-staging
  • Run the following commands to simulate the lambda functions
cd cdk.out
 sam build -t SamCdkStack.template.json 
 sam local start-lambda --parameter-overrides 'ParameterKey=environmentType,ParameterValue=Dev'
  • Use this documentation to download the StepFunction local simulator.
  • Run the following command to start the StepFunction simulator.
java -jar StepFunctionsLocal.jar --lambda-endpoint http://localhost:3001 --aws-account 012345678912 step-functions-endpoint http://localhost:8083
  • Run the following command to create the State Machine.
aws stepfunctions --endpoint http://localhost:8083 create-state-machine --definition "{\
\"StartAt\":\"SomeTask\",\
\"States\":{\
    \"SomeTask\":{\
        \"End\":true,\
        \"Retry\":[\
        {\
            \"ErrorEquals\":[ \"Lambda.ServiceException\", \"Lambda.AWSLambdaException\", \"Lambda.SdkClientException\" ],\
            \"IntervalSeconds\":2,\
            \"MaxAttempts\":6,\
            \"BackoffRate\":2\
        }\
        ],\
        \"Type\":\"Task\",\
        \"Resource\":\"arn:aws:states:::lambda:invoke\",\
        \"Parameters\":{\
        \"FunctionName\":\"arn:aws:lambda:us-east-1:012345678912:function:some-task-function\",\
        \"Payload\":{\
            \"message\":\"Hello from CDK!\"\
        }\
        }\
    }\
}\
}"  --name "sam-cdk-state-machine" --role-arn "arn:aws:iam::123456789012:role/DummyRole"
  • Run the following Command to invoke the Router Lambda function, which will create a StateMachine instance. Then the create StateMachine instance will invoke SomeTaskFunction
  • check the out.txt to get the created StateMachine instance ARN. It should contain something similar to the following
{
    "statusCode":200,
    "body":"{
        \"message\":\"Step Function started. new Execution arn:aws:states:us-east-1:012345678912:execution:sam-cdk-state-machine:0c371858-8013-46c7-917e-7731f08dee89\"
    }"
}
  • Run the following command, to describe the created StateMachine instance
aws stepfunctions --endpoint http://localhost:8083 describe-execution --execution-arn arn:aws:states:us-east-1:012345678912:execution:sam-cdk-state-machine:0c371858-8013-46c7-917e-7731f08dee89