# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import logging, sys, time
from autotest_lib.client.common_lib import error
from autotest_lib.server import autotest
from autotest_lib.server import hosts
from autotest_lib.server import test

class hardware_StorageStress(test.test):
    """
    Integrity stress test for storage device
    """
    version = 1

    _HOURS_IN_SEC = 3600
    # Define default value for the test case
    _TEST_GAP = 60 # 1 min
    _TEST_DURATION = 12 * _HOURS_IN_SEC
    _SUSPEND_DURATION = _HOURS_IN_SEC
    _FIO_REQUIREMENT_FILE = '8k_async_randwrite'
    _FIO_WRITE_FLAGS = []
    _FIO_VERIFY_FLAGS = ['--verifyonly']

    def run_once(self, client_ip, gap=_TEST_GAP, duration=_TEST_DURATION,
                 power_command='reboot', storage_test_command='integrity',
                 suspend_duration=_SUSPEND_DURATION, storage_test_argument=''):
        """
        Run the Storage stress test
        Use hardwareStorageFio to run some test_command repeatedly for a long
        time. Between each iteration of test command, run power command such as
        reboot or suspend.

        @param client_ip:     string of client's ip address (required)
        @param gap:           gap between each test (second) default = 1 min
        @param duration:      duration to run test (second) default = 12 hours
        @param power_command: command to do between each test Command
                              possible command: reboot / suspend / nothing
        @param storage_test_command:  FIO command to run
                              - integrity:  Check data integrity
                              - full_write: Check performance consistency
                                            for full disk write. Use argument
                                            to determine which disk to write
        @param suspend_duration: if power_command is suspend, how long the DUT
                              is suspended.
        """

        # init test
        if not client_ip:
            error.TestError("Must provide client's IP address to test")

        self._client = hosts.create_host(client_ip)
        self._client_at = autotest.Autotest(self._client)
        self._results = {}
        self._suspend_duration = suspend_duration

        # parse power command
        if power_command == 'nothing':
            power_func = self._do_nothing
        elif power_command == 'reboot':
            power_func = self._do_reboot
        elif power_command == 'suspend':
            power_func = self._do_suspend
        else:
            raise error.TestFail(
                'Test failed with error: Invalid power command')

        # Test is doing a lot of disk activity, monitor disk data at each iteration.
        self.job.add_sysinfo_logfile('/var/log/storage_info.txt', on_every_test=True)

        # parse test command
        if storage_test_command == 'integrity':
            setup_func = self._write_data
            loop_func = self._verify_data
        elif storage_test_command == 'full_write':
            setup_func = self._do_nothing
            loop_func = self._full_disk_write
            # Do at least 2 soak runs. Given the absolute minimum of a loop is
            # around 1h, duration should be at least 1h.
            self._soak_time = min(self._TEST_DURATION, duration / 4)
        else:
            raise error.TestFail('Test failed with error: Invalid test command')

        # init statistic variable
        min_time_per_loop = sys.maxsize
        max_time_per_loop = 0
        all_loop_time = 0
        avr_time_per_loop = 0
        self._loop_count = 0
        setup_func()

        start_time = time.time()

        while time.time() - start_time < duration:
            # sleep
            time.sleep(gap)

            self._loop_count += 1

            # do power command & verify data & calculate time
            loop_start_time = time.time()
            power_func()
            loop_func()
            loop_time = time.time() - loop_start_time

            # update statistic
            all_loop_time += loop_time
            min_time_per_loop = min(loop_time, min_time_per_loop)
            max_time_per_loop = max(loop_time, max_time_per_loop)

        if self._loop_count > 0:
            avr_time_per_loop = all_loop_time / self._loop_count

        logging.info(str('check data count: %d' % self._loop_count))

        # report result
        self.write_perf_keyval({'loop_count':self._loop_count})
        self.write_perf_keyval({'min_time_per_loop':min_time_per_loop})
        self.write_perf_keyval({'max_time_per_loop':max_time_per_loop})
        self.write_perf_keyval({'avr_time_per_loop':avr_time_per_loop})

    def _do_nothing(self):
        pass

    def _do_reboot(self):
        """
        Reboot host machine
        """
        self._client.reboot()

    def _do_suspend(self):
        """
        Suspend host machine
        """
        self._client.suspend(suspend_time=self._suspend_duration)

    def _write_data(self):
        """
        Write test data to host using hardware_StorageFio
        """
        logging.info('_write_data')
        self._client_at.run_test('hardware_StorageFio',
            check_client_result=True, disable_sysinfo=True, wait=0,
            tag='%s_%d' % ('write_data', self._loop_count),
            requirements=[(self._FIO_REQUIREMENT_FILE, self._FIO_WRITE_FLAGS)])

    def _verify_data(self):
        """
        Verify test data using hardware_StorageFio
        """
        logging.info(str('_verify_data #%d' % self._loop_count))
        self._client_at.run_test('hardware_StorageFio',
            check_client_result=True, disable_sysinfo=True, wait=0,
            tag='%s_%d' % ('verify_data', self._loop_count),
            requirements=[(self._FIO_REQUIREMENT_FILE, self._FIO_VERIFY_FLAGS)])

    def _full_disk_write(self):
        """
        Do the root device full area write and report performance
        Write random pattern for few hours, then do a write and a verify,
        noting the latency.
        """
        logging.info(str('_full_disk_write #%d' % self._loop_count))

        # use the default requirement that write different pattern arround.
        self._client_at.run_test('hardware_StorageFio',
                                 check_client_result=True,
                                 disable_sysinfo=True,
                                 tag='%s_%d' % ('soak', self._loop_count),
                                 requirements=[('64k_stress', [])],
                                 time_length=self._soak_time)

        self._client_at.run_test('hardware_StorageFio',
                                 check_client_result=True,
                                 disable_sysinfo=True,
                                 tag='%s_%d' % ('surf', self._loop_count),
                                 requirements=[('surfing', [])],
                                 time_length=self._soak_time)

        self._client_at.run_test('hardware_StorageFio',
                                 check_client_result=True,
                                 disable_sysinfo=True,
                                 tag='%s_%d' % ('integrity', self._loop_count),
                                 wait=0, integrity=True)

        self._client_at.run_test('hardware_StorageWearoutDetect',
                                 tag='%s_%d' % ('wearout', self._loop_count),
                                 wait=0, use_cached_result=False)
        # No checkout for wearout, to test device pass their limits.