@almamedia-open-source/cdk-project-stack

Opinionated AWS CDK construct to define CloudFormation Stacks with sensible defaults and tags.

Simplifies stack creation:

new MyStack(project, 'MyExampleStack', { summary: 'This is required' }); // extends ProjectStack, see "usage"

…by automatically setting Stack:

• Name
• Termination Protection
• CDK environment (Account ID & Region)
• Tags (for the stack itself and its resources)

Important

🚧 This tool is work-in-progress and experimental!

All @almamedia-open-source/cdk- prefixed constructs/utilities are based on existing CDK constructs/utilities we've developed & used (in production) internally at Alma Media since 2019.

Breaking changes may occur at any given time without prior warning before first v1 major is released, as we rewrite them for CDK v2 and use this opportunity to also redesign & refactor.

Feedback is most welcome, but do note that we intend to implement these new constructs/utilities and their APIs in such manner that our existing CDK v1 production workloads can easily migrate into these new @almamedia-open-source/cdk- constructs/utilities.

Installation

• Ensure you meet following requirements:

  • NodeJS v14.17.6 or newer
  • AWS Cloud Development Kit v2.0.0 or newer

• Install peer dependency @almamedia-open-source/cdk-project-context:

  npm i -D @almamedia-open-source/cdk-project-context
  

• Install this tool:

  npm i -D @almamedia-open-source/cdk-project-stack
  

Usage

• Initialize your CDK App with Project construct as documented in @almamedia-open-source/cdk-project-context:

  // bin/app.ts
  
  import { Project } from '@almamedia-open-source/cdk-project-context';
  
  // new Project instead of new App
  const project = new Project({
    name: 'my-cool-project',
    author: {
      organization: 'Acme Corp',
      name: 'Mad Scientists',
      email: '[e-mail]',
    },
    defaultRegion: 'eu-west-1', // defaults to one of: $CDK_DEFAULT_REGION, $AWS_REGION or us-east-1
    accounts: {
      dev: {
        id: '111111111111',
        config: {
          baseDomain: 'example.net',
        },
      },
      prod: {
        id: '222222222222',
        config: {
          baseDomain: 'example.com',
        },
      },
    },
  })
  

• Define your stack by extending ProjectStack (instead of CDK's Stack):

  // lib/my-stack.ts
  
  import { Construct } from 'constructs';
  import { StackProps } from 'aws-cdk-lib';
  import { ProjectStack } from '@almamedia-open-source/cdk-project-stack';
  
  export class MyStack extends ProjectStack {
    constructor(scope: Construct, id: string, props?: StackProps) {
      super(scope, id, props);
        // define your resources...
      }
  }
  

• Import and initialize your stack:

  new MyStack(project, 'MyExampleStack', { summary: 'This is required' });
  

• Run CDK commands with (optional) environment-type (or shorthand: environment or env) CLI context flag, for example:

  npx cdk deploy --context account=dev --context environment=staging
  

• Resulting Stack properties

  Property	Example value
  stackName	"MyCoolProject-Environment-Staging-MyExampleStack"
  terminationProtection	true
  env.account	"111111111111"
  env.region	"eu-west-1"

• Resulting Tags for the Stack and its resources

  Property	Example value
  Account	dev
  Environment	staging
  Project	my-cool-project
  Author	Mad Scientists
  Organization	Acme Corp
  Contact	[e-mail]

StackProps resolution

You may always override these values by passing in regular CDK StackProps; But, by default this construct aims to provide sensible defaults – making splitting CDK application into multiple stacks easier as you don't have to remember to specify all of these values for all the stacks.

Considering the example stack with no StackProps (other than required description):

new MyStack(project, 'MyExampleStack', { description: 'This is required' });

Stack Name

The construct ID given to stack instance is used as a "base name" (e.g. MyExampleStack) for the stack:

Runtime Context via CLI	Value
-c account=dev -c env=staging	MyCoolProject-Environment-Staging-MyExampleStack
-c account=dev	MyCoolProject-Account-MyExampleStack
-	MyCoolProject-MyExampleStack

Termination Protection

Stack Termination Protection is enabled for account stacks and long-lived & stable environmental stacks (belonging to either staging or production environment):

Runtime Context via CLI	Value	Explanation
-c account=dev -c env=staging	true	staging considered as long-lived & "stable" environment
-c account=prod -c env=production	true	production considered as long-lived & "stable" environment
-c account=dev -c env=development	false	short-lived development environment
-c account=dev -c env=feature/foo-bar	false	short-lived development environment
-c account=dev	true	account level resources (used by various environments)
-	false	miscellaneous resources, often during initial development

Account ID

Account ID is resolved by @almamedia-open-source/cdk-project-context matching the given -c account=key to key in accounts object defined in the Project (App) initialization props:

{
  // (unrelated configuration removed for brevity)
  accounts: {
    dev: {
      id: '111111111111',
      config: {
        baseDomain: 'example.net',
      },
    },
    prod: {
      id: '222222222222',
      config: {
        baseDomain: 'example.com',
      },
    },
  },
}

If Runtime Context via CLI --context account=key not provided, you must specify account ID yourself into StackProps:

new MyStack(project, 'MyExampleStack', {
  summary: 'This is required',
  env: {
    account: '123456789012',
  },
});

Region

Region is resolved by @almamedia-open-source/cdk-project-context. Basically in the following order:

• defaultRegion value in Project (App) initialization
• $CDK_DEFAULT_REGION environment variable
• $AWS_REGION environment variable
• us-east-1

Stack Name Length

128 chars

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-using-console-create-stack-parameters.html

Alma Media Legacy Tags

If you're an Alma Media employee migrating from our internal CDK v1 constructs to this CDK v2 construct, read the following migration info:

Our internal (CDK v1) constructs used to have:

• Capital Case values for Project (Name) Tag value, for example: My Cool Project
• ProjectAndEnvironment tag

This new CDK v2 construct sets the tag values in the same format & case style as provided in Project configuration (so no case conversion) and it does not provide the combined ProjectAndEnvironment tag anymore, this might potentially break some existing workloads: To solve this, you can control the casing by using a modifier context value in cdk.json:

{
  "context": {
    "@almamedia-open-source/cdk-project-stack:legacyTags": true
  }
}

But if you don't need the legacy tag style (i.e. the change does not break anything), just use the new tag convention. As always, be sure to view the diff of the changes and test the changes in multiple environments before deploying into production!