#
# Copyright (c) 2021 Nutanix Inc. All rights reserved.
#
# Authors: Thanos Makatos <thanos.makatos@nutanix.com>
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from libvfio_user import *
import errno
from unittest.mock import patch


ctx = None


def setup_function(function):
    global ctx, sock
    ctx = prepare_ctx_for_dma()
    assert ctx is not None
    sock = connect_client(ctx)


def teardown_function(function):
    global ctx
    vfu_destroy_ctx(ctx)


@patch('libvfio_user.quiesce_cb')
def test_device_quiesced_no_quiesce_requested(mock_quiesce):
    """
    Checks that vfu_device_quiesce returns an error if called when there is
    no pending quiesce operation.
    """

    global ctx
    ret = vfu_device_quiesced(ctx, 0)
    assert ret == -1
    assert c.get_errno() == errno.EINVAL
    assert mock_quiesce.call_count == 0


@patch('libvfio_user.quiesce_cb', side_effect=fail_with_errno(errno.ENOTTY))
def test_device_quiesce_error(mock_quiesce):
    """
    Checks that if the device quiesce callback fails then the operation
    that requested it also fails with the same error.
    """

    global ctx, sock

    payload = vfio_user_dma_map(argsz=len(vfio_user_dma_map()),
        flags=(VFIO_USER_F_DMA_REGION_READ |
               VFIO_USER_F_DMA_REGION_WRITE),
        offset=0, addr=0x10000, size=0x1000)

    msg(ctx, sock, VFIO_USER_DMA_MAP, payload, errno.ENOTTY)


@patch('libvfio_user.dma_register')
@patch('libvfio_user.quiesce_cb', side_effect=fail_with_errno(errno.EBUSY))
def test_device_quiesce_error_after_busy(mock_quiesce, mock_dma_register):
    """
    Checks that the device fails to quiesce after it was busy quiescing.
    """

    global ctx, sock

    payload = vfio_user_dma_map(argsz=len(vfio_user_dma_map()),
        flags=(VFIO_USER_F_DMA_REGION_READ |
               VFIO_USER_F_DMA_REGION_WRITE),
        offset=0, addr=0x10000, size=0x1000)

    msg(ctx, sock, VFIO_USER_DMA_MAP, payload, rsp=False,
        expect_run_ctx_errno=errno.EBUSY)

    ret = vfu_device_quiesced(ctx, errno.ENOTTY)
    assert ret == 0

    mock_dma_register.assert_not_called()

    # check that the DMA region was NOT added
    count, sgs = vfu_addr_to_sg(ctx, 0x10000, 0x1000)
    assert count == -1
    assert c.get_errno() == errno.ENOENT


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