Hooks

[eladb]

PR	Champion
#

Description

Allow specifying arbitrary handlers which execute as part of the deployment process and hook them into various events such as before/after a resource or before/after stack deployments.

See #75 for a discussion
Then, use these for e.g. integration test assertions (#31)

Progress

• Tracking Issue Created
• RFC PR Created
• Core Team Member Assigned
• Initial Approval / Final Comment Period
• Ready For Implementation
  • implementation issue 1
• Resolved

[eladb]

From #71:

I've been digging through the source and the docs for a while now and it appears there are no events output by the app, a stack, or constructs. This makes it difficult or impossible to use the CDK to orchestrate environments that require non-cfn related tasks.

Ex:

• I have a stack that generates a bucket
• When the bucket is created I want to upload a file
• Once that file is uploaded I want to trigger another stack

I can orchestrate this with a pipeline - which is what I'll do. But I'd like to be able to manage this locally as part of a package where a single cli command can kick this off. I'm sure there other use cases for events as well.

What I'd like to see:

Events added to a stack that are emmitted on state change:

var Stack = new CustomStack(app, 'CustomStack');
Stack.on('change', evt => {
  if (evt.State == States.CREATE_COMPLETE) {
    // do my thing;
  }
})

I also think individual resources could use these events.

[eladb]

Duplicate #71