Can step functions wait on a static website? - amazon-s3

Question

If I deploy a static website with s3 and api gateway, is there any way for a step function to wait for some activity, then redirect the user on that static website to another?

Answer 1

WeCanBeFriends,
This is possible using the Job Status Poller pattern, but tweaked slightly. If the "Job" is to deploy the website, then the condition to "Complete Job" is to see some activity come in (ideally through cloudwatch metrics).
Once you see enough metrics to be ok with your deployment, you can either do a push notification to the webapp to inform it to redirect (using a lambda function that calls SNS - as in the wait timer sample) or have the webapp poll the execution status until it's complete.
Below I've posted a very simple variation to the Job Status Poller to illustrate my example:
{
"Comment": "A state machine that publishes to SNS after a deployment completes.",
"StartAt": "StartDeployment",
"States": {
"StartDeployment": {
"Type": "Task",
"Resource": "arn:aws:lambda:us-east-1:012345678912:function:KickOffDeployment",
"ResultPath": "$.guid",
"Next": "CheckIfDeploymentComplete"
},
"CheckIfDeploymentComplete": {
"Type": "Task",
"Resource": "arn:aws:lambda:us-east-1:012345678912:function:CheckIfDeploymentComplete",
"Next": "TriggerWebAppRefresh",
"InputPath": "$.guid",
"ResultPath": "$.status",
"Retry": [ {
"ErrorEquals": [ "INPROGRESS" ],
"IntervalSeconds": 5,
"MaxAttempts": 240,
"BackoffRate": 1.0
} ],
"Catch": [ {
"ErrorEquals": ["FAILED"],
"Next": "DeploymentFailed"
}]
},
"DeploymentFailed": {
"Type": "Fail",
"Cause": "Deployment failed",
"Error": "Deployment FAILED"
},
"TriggerWebAppRefresh": {
"Type": "Task",
"Resource": "arn:aws:lambda:us-east-1:012345678912:function:SendSNSToWebapp",
"InputPath": "$.guid",
"End": true
}
}
}