// resourceAwsVPCPeeringConnectionStateRefreshFunc returns a resource.StateRefreshFunc that is used to watch
// a VPCPeeringConnection.
func resourceAwsVPCPeeringConnectionStateRefreshFunc(conn *ec2.EC2, id string) resource.StateRefreshFunc {
	return func() (interface{}, string, error) {

		resp, err := conn.DescribeVPCPeeringConnections(&ec2.DescribeVPCPeeringConnectionsInput{
			VPCPeeringConnectionIDs: []*string{aws.String(id)},
		})
		if err != nil {
			if ec2err, ok := err.(awserr.Error); ok && ec2err.Code() == "InvalidVpcPeeringConnectionID.NotFound" {
				resp = nil
			} else {
				log.Printf("Error on VPCPeeringConnectionStateRefresh: %s", err)
				return nil, "", err
			}
		}

		if resp == nil {
			// Sometimes AWS just has consistency issues and doesn't see
			// our instance yet. Return an empty state.
			return nil, "", nil
		}

		pc := resp.VPCPeeringConnections[0]

		return pc, *pc.Status.Code, nil
	}
}