get_tags_fast.go

package main

import (
	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/rds"
	"fmt"
)


func getTags(svc *rds.RDS, arn *string, c chan *rds.ListTagsForResourceOutput) {
	params := &rds.ListTagsForResourceInput{
		ResourceName: arn,
	}
	tags, err := svc.ListTagsForResource(params)

	if err != nil {
		fmt.Println(err.Error())
	}
	c <- tags
}

func main() {

	sess, err := session.NewSessionWithOptions(session.Options{
		Profile: "aws-account-name",
		Config: aws.Config{Region: aws.String("us-west-2")},
	})
	svc := rds.New(sess)

	resp, err := svc.DescribeDBInstances(&rds.DescribeDBInstancesInput{})

	if err != nil {
		fmt.Println(err.Error())
		return
	}

	c := make(chan *rds.ListTagsForResourceOutput)
	for _, dbInstance := range(resp.DBInstances) {
		go getTags(svc, dbInstance.DBInstanceArn, c)
	}

	for elem := range(c) {
		fmt.Println(elem)
	}

}