AWS Lambda Describe Instances Go example

code.go

func (app *App) describeInstances(id string, name string) ([]Node, error) {
	svc := ec2.New(app.cfg)
	input := &ec2.DescribeInstancesInput{
		InstanceIds: []string{id},
		Filters: []ec2.Filter{
			{
				Name:   aws.String("tag:Name"),
				Values: []string{name},
			},
		},
	}
	req := svc.DescribeInstancesRequest(input)

	output, err := req.Send(app.ctx)

	if err != nil {
		if aerr, ok := err.(awserr.Error); ok {
			switch aerr.Code() {
			default:
				err = aerr
			}
			return nil, err
		}
	}

	var nodes []Node
	for _, reservation := range output.Reservations {
		for _, in := range reservation.Instances {
			var n Node
			n.ID = *in.InstanceId
			n.Type = string(in.InstanceType)
			n.Name = name
			n.State = in.State.Name
			if in.NetworkInterfaces != nil {
				n.IP = *in.NetworkInterfaces[0].PrivateIpAddress
			}
			nodes = append(nodes, n)
		}
	}
	return nodes, nil
}