#!/usr/bin/env python
#
# Tests for image block commit.
#
# Copyright (C) 2012 IBM, Corp.
# Copyright (C) 2012 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Test for live block commit
# Derived from Image Streaming Test 030

import time
import os
import iotests
from iotests import qemu_img, qemu_io
import struct
import errno

backing_img = os.path.join(iotests.test_dir, 'backing.img')
mid_img = os.path.join(iotests.test_dir, 'mid.img')
test_img = os.path.join(iotests.test_dir, 'test.img')

class ImageCommitTestCase(iotests.QMPTestCase):
    '''Abstract base class for image commit test cases'''

    def wait_for_complete(self, need_ready=False):
        completed = False
        ready = False
        while not completed:
            for event in self.vm.get_qmp_events(wait=True):
                if event['event'] == 'BLOCK_JOB_COMPLETED':
                    self.assert_qmp_absent(event, 'data/error')
                    self.assert_qmp(event, 'data/type', 'commit')
                    self.assert_qmp(event, 'data/device', 'drive0')
                    self.assert_qmp(event, 'data/offset', event['data']['len'])
                    if need_ready:
                        self.assertTrue(ready, "Expecting BLOCK_JOB_COMPLETED event")
                    completed = True
                elif event['event'] == 'BLOCK_JOB_READY':
                    ready = True
                    self.assert_qmp(event, 'data/type', 'commit')
                    self.assert_qmp(event, 'data/device', 'drive0')
                    self.vm.qmp('block-job-complete', device='drive0')

        self.assert_no_active_block_jobs()
        self.vm.shutdown()

    def run_commit_test(self, top, base, need_ready=False):
        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0', top=top, base=base)
        self.assert_qmp(result, 'return', {})
        self.wait_for_complete(need_ready)

    def run_default_commit_test(self):
        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0')
        self.assert_qmp(result, 'return', {})
        self.wait_for_complete()

class TestSingleDrive(ImageCommitTestCase):
    # Need some space after the copied data so that throttling is effective in
    # tests that use it rather than just completing the job immediately
    image_len = 2 * 1024 * 1024
    test_len = 1 * 1024 * 256

    def setUp(self):
        iotests.create_image(backing_img, self.image_len)
        qemu_img('create', '-f', iotests.imgfmt, '-o', 'backing_file=%s' % backing_img, mid_img)
        qemu_img('create', '-f', iotests.imgfmt, '-o', 'backing_file=%s' % mid_img, test_img)
        qemu_io('-f', 'raw', '-c', 'write -P 0xab 0 524288', backing_img)
        qemu_io('-f', iotests.imgfmt, '-c', 'write -P 0xef 524288 524288', mid_img)
        self.vm = iotests.VM().add_drive(test_img, interface="none")
        self.vm.add_device("virtio-scsi-pci")
        self.vm.add_device("scsi-hd,id=scsi0,drive=drive0")
        self.vm.launch()

    def tearDown(self):
        self.vm.shutdown()
        os.remove(test_img)
        os.remove(mid_img)
        os.remove(backing_img)

    def test_commit(self):
        self.run_commit_test(mid_img, backing_img)
        self.assertEqual(-1, qemu_io('-f', 'raw', '-c', 'read -P 0xab 0 524288', backing_img).find("verification failed"))
        self.assertEqual(-1, qemu_io('-f', 'raw', '-c', 'read -P 0xef 524288 524288', backing_img).find("verification failed"))

    def test_device_not_found(self):
        result = self.vm.qmp('block-commit', device='nonexistent', top='%s' % mid_img)
        self.assert_qmp(result, 'error/class', 'DeviceNotFound')

    def test_top_same_base(self):
        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0', top='%s' % backing_img, base='%s' % backing_img)
        self.assert_qmp(result, 'error/class', 'GenericError')
        self.assert_qmp(result, 'error/desc', 'Base \'%s\' not found' % backing_img)

    def test_top_invalid(self):
        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0', top='badfile', base='%s' % backing_img)
        self.assert_qmp(result, 'error/class', 'GenericError')
        self.assert_qmp(result, 'error/desc', 'Top image file badfile not found')

    def test_base_invalid(self):
        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0', top='%s' % mid_img, base='badfile')
        self.assert_qmp(result, 'error/class', 'GenericError')
        self.assert_qmp(result, 'error/desc', 'Base \'badfile\' not found')

    def test_top_is_active(self):
        self.run_commit_test(test_img, backing_img, need_ready=True)
        self.assertEqual(-1, qemu_io('-f', 'raw', '-c', 'read -P 0xab 0 524288', backing_img).find("verification failed"))
        self.assertEqual(-1, qemu_io('-f', 'raw', '-c', 'read -P 0xef 524288 524288', backing_img).find("verification failed"))

    def test_top_is_default_active(self):
        self.run_default_commit_test()
        self.assertEqual(-1, qemu_io('-f', 'raw', '-c', 'read -P 0xab 0 524288', backing_img).find("verification failed"))
        self.assertEqual(-1, qemu_io('-f', 'raw', '-c', 'read -P 0xef 524288 524288', backing_img).find("verification failed"))

    def test_top_and_base_reversed(self):
        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0', top='%s' % backing_img, base='%s' % mid_img)
        self.assert_qmp(result, 'error/class', 'GenericError')
        self.assert_qmp(result, 'error/desc', 'Base \'%s\' not found' % mid_img)

    # When the job is running on a BB that is automatically deleted on hot
    # unplug, the job is cancelled when the device disappears
    def test_hot_unplug(self):
        if self.image_len == 0:
            return

        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0', top=mid_img,
                             base=backing_img, speed=(self.image_len / 4))
        self.assert_qmp(result, 'return', {})
        result = self.vm.qmp('device_del', id='scsi0')
        self.assert_qmp(result, 'return', {})

        cancelled = False
        deleted = False
        while not cancelled or not deleted:
            for event in self.vm.get_qmp_events(wait=True):
                if event['event'] == 'DEVICE_DELETED':
                    self.assert_qmp(event, 'data/device', 'scsi0')
                    deleted = True
                elif event['event'] == 'BLOCK_JOB_CANCELLED':
                    self.assert_qmp(event, 'data/device', 'drive0')
                    cancelled = True
                else:
                    self.fail("Unexpected event %s" % (event['event']))

        self.assert_no_active_block_jobs()

class TestRelativePaths(ImageCommitTestCase):
    image_len = 1 * 1024 * 1024
    test_len = 1 * 1024 * 256

    dir1 = "dir1"
    dir2 = "dir2/"
    dir3 = "dir2/dir3/"

    test_img = os.path.join(iotests.test_dir, dir3, 'test.img')
    mid_img = "../mid.img"
    backing_img = "../dir1/backing.img"

    backing_img_abs = os.path.join(iotests.test_dir, dir1, 'backing.img')
    mid_img_abs = os.path.join(iotests.test_dir, dir2, 'mid.img')

    def setUp(self):
        try:
            os.mkdir(os.path.join(iotests.test_dir, self.dir1))
            os.mkdir(os.path.join(iotests.test_dir, self.dir2))
            os.mkdir(os.path.join(iotests.test_dir, self.dir3))
        except OSError as exception:
            if exception.errno != errno.EEXIST:
                raise
        iotests.create_image(self.backing_img_abs, TestRelativePaths.image_len)
        qemu_img('create', '-f', iotests.imgfmt, '-o', 'backing_file=%s' % self.backing_img_abs, self.mid_img_abs)
        qemu_img('create', '-f', iotests.imgfmt, '-o', 'backing_file=%s' % self.mid_img_abs, self.test_img)
        qemu_img('rebase', '-u', '-b', self.backing_img, self.mid_img_abs)
        qemu_img('rebase', '-u', '-b', self.mid_img, self.test_img)
        qemu_io('-f', 'raw', '-c', 'write -P 0xab 0 524288', self.backing_img_abs)
        qemu_io('-f', iotests.imgfmt, '-c', 'write -P 0xef 524288 524288', self.mid_img_abs)
        self.vm = iotests.VM().add_drive(self.test_img)
        self.vm.launch()

    def tearDown(self):
        self.vm.shutdown()
        os.remove(self.test_img)
        os.remove(self.mid_img_abs)
        os.remove(self.backing_img_abs)
        try:
            os.rmdir(os.path.join(iotests.test_dir, self.dir1))
            os.rmdir(os.path.join(iotests.test_dir, self.dir3))
            os.rmdir(os.path.join(iotests.test_dir, self.dir2))
        except OSError as exception:
            if exception.errno != errno.EEXIST and exception.errno != errno.ENOTEMPTY:
                raise

    def test_commit(self):
        self.run_commit_test(self.mid_img, self.backing_img)
        self.assertEqual(-1, qemu_io('-f', 'raw', '-c', 'read -P 0xab 0 524288', self.backing_img_abs).find("verification failed"))
        self.assertEqual(-1, qemu_io('-f', 'raw', '-c', 'read -P 0xef 524288 524288', self.backing_img_abs).find("verification failed"))

    def test_device_not_found(self):
        result = self.vm.qmp('block-commit', device='nonexistent', top='%s' % self.mid_img)
        self.assert_qmp(result, 'error/class', 'DeviceNotFound')

    def test_top_same_base(self):
        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0', top='%s' % self.mid_img, base='%s' % self.mid_img)
        self.assert_qmp(result, 'error/class', 'GenericError')
        self.assert_qmp(result, 'error/desc', 'Base \'%s\' not found' % self.mid_img)

    def test_top_invalid(self):
        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0', top='badfile', base='%s' % self.backing_img)
        self.assert_qmp(result, 'error/class', 'GenericError')
        self.assert_qmp(result, 'error/desc', 'Top image file badfile not found')

    def test_base_invalid(self):
        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0', top='%s' % self.mid_img, base='badfile')
        self.assert_qmp(result, 'error/class', 'GenericError')
        self.assert_qmp(result, 'error/desc', 'Base \'badfile\' not found')

    def test_top_is_active(self):
        self.run_commit_test(self.test_img, self.backing_img)
        self.assertEqual(-1, qemu_io('-f', 'raw', '-c', 'read -P 0xab 0 524288', self.backing_img_abs).find("verification failed"))
        self.assertEqual(-1, qemu_io('-f', 'raw', '-c', 'read -P 0xef 524288 524288', self.backing_img_abs).find("verification failed"))

    def test_top_and_base_reversed(self):
        self.assert_no_active_block_jobs()
        result = self.vm.qmp('block-commit', device='drive0', top='%s' % self.backing_img, base='%s' % self.mid_img)
        self.assert_qmp(result, 'error/class', 'GenericError')
        self.assert_qmp(result, 'error/desc', 'Base \'%s\' not found' % self.mid_img)


class TestSetSpeed(ImageCommitTestCase):
    image_len = 80 * 1024 * 1024 # MB

    def setUp(self):
        qemu_img('create', backing_img, str(TestSetSpeed.image_len))
        qemu_img('create', '-f', iotests.imgfmt, '-o', 'backing_file=%s' % backing_img, mid_img)
        qemu_img('create', '-f', iotests.imgfmt, '-o', 'backing_file=%s' % mid_img, test_img)
        qemu_io('-f', iotests.imgfmt, '-c', 'write -P 0x1 0 512', test_img)
        qemu_io('-f', iotests.imgfmt, '-c', 'write -P 0xef 524288 524288', mid_img)
        self.vm = iotests.VM().add_drive(test_img)
        self.vm.launch()

    def tearDown(self):
        self.vm.shutdown()
        os.remove(test_img)
        os.remove(mid_img)
        os.remove(backing_img)

    def test_set_speed(self):
        self.assert_no_active_block_jobs()

        self.vm.pause_drive('drive0')
        result = self.vm.qmp('block-commit', device='drive0', top=mid_img, speed=1024 * 1024)
        self.assert_qmp(result, 'return', {})

        # Ensure the speed we set was accepted
        result = self.vm.qmp('query-block-jobs')
        self.assert_qmp(result, 'return[0]/device', 'drive0')
        self.assert_qmp(result, 'return[0]/speed', 1024 * 1024)

        self.cancel_and_wait(resume=True)

class TestActiveZeroLengthImage(TestSingleDrive):
    image_len = 0

class TestReopenOverlay(ImageCommitTestCase):
    image_len = 1024 * 1024
    img0 = os.path.join(iotests.test_dir, '0.img')
    img1 = os.path.join(iotests.test_dir, '1.img')
    img2 = os.path.join(iotests.test_dir, '2.img')
    img3 = os.path.join(iotests.test_dir, '3.img')

    def setUp(self):
        iotests.create_image(self.img0, self.image_len)
        qemu_img('create', '-f', iotests.imgfmt, '-o', 'backing_file=%s' % self.img0, self.img1)
        qemu_img('create', '-f', iotests.imgfmt, '-o', 'backing_file=%s' % self.img1, self.img2)
        qemu_img('create', '-f', iotests.imgfmt, '-o', 'backing_file=%s' % self.img2, self.img3)
        qemu_io('-f', iotests.imgfmt, '-c', 'write -P 0xab 0 128K', self.img1)
        self.vm = iotests.VM().add_drive(self.img3)
        self.vm.launch()

    def tearDown(self):
        self.vm.shutdown()
        os.remove(self.img0)
        os.remove(self.img1)
        os.remove(self.img2)
        os.remove(self.img3)

    # This tests what happens when the overlay image of the 'top' node
    # needs to be reopened in read-write mode in order to update the
    # backing image string.
    def test_reopen_overlay(self):
        self.run_commit_test(self.img1, self.img0)

if __name__ == '__main__':
    iotests.main(supported_fmts=['qcow2', 'qed'])
