Dealing with AWS API pagination

ecs_iterator.go

package ecsiterator

import (
	"context"
	
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/ecs"
)

func GetContainerInstanceArnsForEcsCluster(e *ecs.Client, ecsClusterName string) ([]string) {
	var nextToken *string
	containerInstanceArns := make([]string, 0)
	for keepGoing := true; keepGoing; {
		if resp, err := e.ListContainerInstances(context.TODO(), &ecs.ListContainerInstancesInput{
			Cluster:   aws.String(ecsClusterName),
			NextToken: nextToken,
		}); err != nil {
			return nil, err
		} else {
			nextToken = resp.NextToken
			containerInstanceArns = append(containerInstanceArns, resp.ContainerInstanceArns...)
		}
		keepGoing = nextToken != nil
	}
	return containerInstanceArns, nil
}