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Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

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[Computing] AWS CDK Aspects in Go

From: andrew cooke <andrew@...>

Date: Tue, 22 Aug 2023 11:02:26 -0400

In theory go (golang) has first class support in AWS CDK.  In practice
there are often missing examples.  Support for Aspects was particularly
poor, so here's a simple example.

This adds a permission boundary to all roles, so you don't have to do
it explicitly (and includes implicit roles).  The ARN for the boundary
includes the account name which is read from the environment.

In examples for other languages there's an issue with "instanceof"
operators (or similar) and multiple javascript packages.  The same
problem may exist here, so treat with care.

The code is very simple, once it's there...

Andrew


package main

import (
    "os"

    "github.com/aws/aws-cdk-go/awscdk/v2"
    iam "github.com/aws/aws-cdk-go/awscdk/v2/awsiam"
    "github.com/aws/aws-sdk-go-v2/aws"
    "github.com/aws/constructs-go/constructs/v10"
)

func main() {
    app = ...
    env = ...
    ...
    awscdk.Aspects_Of(app).Add(&AddPermissionsBoundary{Account: env.Account})
    ...
    app.Synth(nil)
}

type AddPermissionsBoundary struct {
    Account *string
}

func (this AddPermissionsBoundary) Visit(node constructs.IConstruct) {
    role, ok := node.(iam.CfnRole)
    if ok {
  	role.SetPermissionsBoundary(aws.String("arn:aws:iam::" + *this.Account + ":policy/my-boundary"))
    } else {
	// not a role - the aspect is applied to all nodes in the tree (visitor pattern)
    }
}

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