@condensetech/cdk-lib

Condense Opinionated CDK Library

This library contains constructs and stacks we use across our projects.

Networking

Networking provides a VPC already configured with public, private and isolated subnets.

It requires setting a cidr or IPAM allocation, to avoid accidental usage of default CIDR.

Optionally, it also creates a bastion host.

It is available as a construct:

class MyStack extends cdk.Stack {
  constructor(scope: Construct, id :string, props?: cdk.StackProps) {
    super(scope, id, props);
    const networking = new Networking(this, 'Networking', {
      cidr: ec2.IpAddresses.cidr('10.0.0.0/16'),
    });
  }
}

or as a stack:

const app = new cdk.App();

const networking = new NetworkingStack(app, 'networking', {
  cidr: ec2.IpAddresses.cidr('10.0.0.0/16'),
})

Both of them implements the INetworking interface, allowing to easily compose your infrastructure.

Database

Supported database constructs:

• Aurora Provisioned Cluster
• RDS Instance

And their relative stack version:

• Aurora Provisioned Cluster
• RDS Instance

All of them implements the IDatabase interface, allowing to easily compose your infrastructure.

Cloudwatch Alarms Topic

The CloudwatchAlarmsTopicStack creates an SNS Topic which can be used as a target for Cloudwatch Alarms, allowing to easily:

• create alarms in Jira Service Desk
• send messages to Discord

Other useful constructs

Naive BasicAuth Cloudfront Function

NaiveBasicAuthCloudfrontFunction is useful when a basic protection layer must be added to Cloudfront (for SPAs or static sites) and you just need to avoid crawlers and unwanted visitors.

Monitoring Facade

By instantiating this class in a stack, it ensures all resources are properly monitored by CloudWatch.

Further configuration can be done by .of method.

class Stack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    const monitoring = new MonitoringFacade(this, 'Monitoring');
    const construct = new MyConstruct(this, 'MyConstruct');
  }
}

export class MyConstruct extends Construct {
  constructor(scope: Construct, id: string) {
    super(scope, id);
    const elb = new elbv2.ApplicationLoadBalancer(this, 'ALB', {
      ...
    });
    MonitoringFacade.of(this).configAppliationLoadBalancer(elb, {
      target5xxErrorsThreshold: 1,
    });
  }
}