#!/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

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 assert_no_active_commit(self):
        result = self.vm.qmp('query-block-jobs')
        self.assert_qmp(result, 'return', [])

    def cancel_and_wait(self, drive='drive0'):
        '''Cancel a block job and wait for it to finish'''
        result = self.vm.qmp('block-job-cancel', device=drive)
        self.assert_qmp(result, 'return', {})

        cancelled = False
        while not cancelled:
            for event in self.vm.get_qmp_events(wait=True):
                if event['event'] == 'BLOCK_JOB_CANCELLED':
                    self.assert_qmp(event, 'data/type', 'commit')
                    self.assert_qmp(event, 'data/device', drive)
                    cancelled = True

        self.assert_no_active_commit()

    def create_image(self, name, size):
        file = open(name, 'w')
        i = 0
        while i < size:
            sector = struct.pack('>l504xl', i / 512, i / 512)
            file.write(sector)
            i = i + 512
        file.close()


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

    def setUp(self):
        self.create_image(backing_img, TestSingleDrive.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('-c', 'write -P 0xab 0 524288', backing_img)
        qemu_io('-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_commit(self):
        self.assert_no_active_commit()
        result = self.vm.qmp('block-commit', device='drive0', top='%s' % mid_img)
        self.assert_qmp(result, 'return', {})

        completed = False
        while not completed:
            for event in self.vm.get_qmp_events(wait=True):
                if event['event'] == 'BLOCK_JOB_COMPLETED':
                    self.assert_qmp(event, 'data/type', 'commit')
                    self.assert_qmp(event, 'data/device', 'drive0')
                    self.assert_qmp(event, 'data/offset', self.image_len)
                    self.assert_qmp(event, 'data/len', self.image_len)
                    completed = True

        self.assert_no_active_commit()
        self.vm.shutdown()

        self.assertEqual(-1, qemu_io('-c', 'read -P 0xab 0 524288', backing_img).find("verification failed"))
        self.assertEqual(-1, qemu_io('-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_commit()
        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', 'Invalid files for merge: top and base are the same')

    def test_top_invalid(self):
        self.assert_no_active_commit()
        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_commit()
        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.assert_no_active_commit()
        result = self.vm.qmp('block-commit', device='drive0', top='%s' % test_img, base='%s' % backing_img)
        self.assert_qmp(result, 'error/class', 'GenericError')
        self.assert_qmp(result, 'error/desc', 'Top image as the active layer is currently unsupported')

    def test_top_and_base_reversed(self):
        self.assert_no_active_commit()
        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 (%(1)s) is not reachable from top (%(2)s)' % {"1" : mid_img, "2" : backing_img})

    def test_top_omitted(self):
        self.assert_no_active_commit()
        result = self.vm.qmp('block-commit', device='drive0')
        self.assert_qmp(result, 'error/class', 'GenericError')
        self.assert_qmp(result, 'error/desc', "Parameter 'top' is missing")


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)
        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_commit()

        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()


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