AWS Step Function example

Setup

PROFILE=...
aws configure --profile $PROFILE

Install

Terraform

AWS_SDK_LOAD_CONFIG=1 AWS_PROFILE=$PROFILE terraform init
AWS_SDK_LOAD_CONFIG=1 AWS_PROFILE=$PROFILE terraform apply

Lambda

zip lambda.zip index.js \
    && aws --profile $PROFILE \
        lambda update-function-code \
        --function-name random-fail \
        --zip-file fileb://lambda.zip \
        --publish \
    && rm lambda.zip

Test

Run the state machine a few times with different inputs, e.g.

{
    "threshold": 0.1
}

to let it fail most likely and check the CloudWatch alarm: Around a minute after the state machine failed a few times the alarm should be marked as "In alarm".