Go – Data Center Notes

Picking up on Diogo’s last post on how to obliterate all resources on your AWS Account, I thought it could also be useful to, instead, list all you have running.

Since I’m long overdue on a Go post, I’m going to share a one file app that uses the Go AWS SDK for to crawl each region for all taggable resources and pretty printing it on stdout, organised by Service type (e.g. EC2, ECS, ELB, etc.), Product Type (e.g. Instance, NAT, subnet, cluster, etc.).

The AWS SDK allows to retrieve all ARNs for taggable resources, so that’s all the info I’ll use for our little app.

Note: If you prefer jumping to full code code, please scroll until the end and read the running instructions before.

The objective

The main goal is to get structured information from the ARNs retrieved, so the first thing is to create a type that serves as a blue print for what I’m trying to achieve. Because I want to keep it simple, let’s call this type SingleResource.

Also, since we are taking care of the basics, we can also define the TraceableRegions that we want the app to crawl through.

Finally, to focus the objective, let’s also create a function that accepts a slice of []*SingleResource and will convert will print it out as a table to stdout:

	// TraceableRegions is a list of AWS regions we want to crawl
	var TraceableRegions = […]string{"us-east-1", "us-east-2", "us-west-1", "us-west-2", "ca-central-1", "eu-central-1", "eu-west-1", "eu-west-2", "eu-west-3", "eu-north-1", "ap-northeast-1", "ap-northeast-2", "ap-northeast-3", "ap-southeast-1", "ap-southeast-2", "ap-south-1", "sa-east-1"}

	// SingleResource defines how we want to describe each AWS resource
	type SingleResource struct {
	Region *string
	Service *string
	Product *string
	Details *string
	ID *string
	ARN *string
	}

	// PrettyPrintResources makes use of a nice golang library to show
	// tables on stdout. Check it out: github.com/olekukonko/tablewriter
	func PrettyPrintResources(resources []*SingleResource) {
	var data [][]string

	for _, r := range resources {
	row := []string{
	DerefNilPointerStrings(r.Region),
	DerefNilPointerStrings(r.Service),
	DerefNilPointerStrings(r.Product),
	DerefNilPointerStrings(r.ID),
	}
	data = append(data, row)
	}

	table := tablewriter.NewWriter(os.Stdout)
	table.SetHeader([]string{"Region", "Service", "Product", "ID"})
	table.SetBorder(true) // Set Border to false
	table.AppendBulk(data)
	table.Render()
	}

view raw

caws_part_part_1.go

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https://gist.github.com/joaoferrao/610482a2394b17546e12d1c172f5198e.js

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