// 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 reading VPC Peering Connection details: %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
	}
}
// 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 reading VPC Peering Connection details: %s", err)
				return nil, "error", 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]

		// A VPC Peering Connection can exist in a failed state due to
		// incorrect VPC ID, account ID, or overlapping IP address range,
		// thus we short circuit before the time out would occur.
		if pc != nil && *pc.Status.Code == "failed" {
			return nil, "failed", errors.New(*pc.Status.Message)
		}

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