#!/usr/bin/python
#
# Copyright (c) 2012 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.

"""Tool for running suites of tests and waiting for completion.

The desired test suite will be scheduled with autotest, and then
this tool will block until the job is complete, printing a summary
at the end.  Error conditions result in exceptions.

This is intended for use only with Chrome OS test suits that leverage the
dynamic suite infrastructure in server/cros/dynamic_suite.py.
"""

import datetime, getpass, hashlib, optparse, os, time, sys
import common
import logging
from autotest_lib.client.common_lib import global_config
from autotest_lib.server.cros import dynamic_suite, frontend_wrappers
from autotest_lib.server.cros import job_status

CONFIG = global_config.global_config


def setup_logging(logfile=None):
    """Setup basic logging with all logging info stripped.

    Calls to logging will only show the message. No severity is logged.

    @param logfile: If specified dump output to a file as well.
    """
    screen_handler = logging.StreamHandler()
    screen_handler.setFormatter(logging.Formatter('%(message)s'))
    logging.getLogger().addHandler(screen_handler)
    logging.getLogger().setLevel(logging.INFO)
    if logfile:
        file_handler = logging.FileHandler(logfile)
        file_handler.setLevel(logging.DEBUG)
        logging.getLogger().addHandler(file_handler)


def parse_options():
    usage = "usage: %prog [options]"
    parser = optparse.OptionParser(usage=usage)
    parser.add_option("-b", "--board", dest="board")
    parser.add_option("-i", "--build", dest="build")
    #  This should just be a boolean flag, but the autotest "proxy" code
    #  can't handle flags that don't take arguments.
    parser.add_option("-n", "--no_wait", dest="no_wait", default=None)
    parser.add_option("-p", "--pool", dest="pool", default=None)
    parser.add_option("-s", "--suite_name", dest="name")
    parser.add_option("-t", "--timeout_min", dest="timeout_min", default=30)
    parser.add_option("-d", "--delay_sec", dest="delay_sec", default=10)
    parser.add_option("-m", "--mock_job_id", dest="mock_job_id",
                      help="Skips running suite; creates report for given ID.")
    options, args = parser.parse_args()
    return parser, options, args


def get_pretty_status(status):
    if status == 'GOOD':
        return '[ PASSED ]'
    return '[ FAILED ]'

def is_fail_status(status):
    # All the statuses tests can have when they fail.
    if status in ['FAIL', 'ERROR', 'TEST_NA']:
        return True
    return False


def status_is_relevant(status):
    """
    Indicates whether the status of a given test is meaningful or not.

    @param status: frontend.TestStatus object to look at.
    @return True if this is a test result worth looking at further.
    """
    return not status['test_name'].startswith('CLIENT_JOB')


def generate_log_link(anchor, job_string):
    """
    Generate a link to this job's logs, for consumption by buildbot.

    @param anchor: Link anchor text.
    @param job_id: the job whose logs we'd like to link to.
    @return A link formatted for the buildbot log annotator.
    """
    host = CONFIG.get_config_value('SERVER', 'hostname', type=str)
    pattern = CONFIG.get_config_value('CROS', 'log_url_pattern', type=str)
    return "@@@STEP_LINK@%s@%s@@@" % (anchor, pattern % (host, job_string))


def get_view_info(suite_job_id, view):
    """
    Parse a view for the slave job name and job_id.

    @param suite_job_id: The job id of our master suite job.
    @param view: Test result view.
    @return A tuple job_name, experimental of the slave test run
            described by view.
    """
    # By default, we are the main suite job since there is no
    # keyval entry for our job_name.
    job_name = '%s-%s' % (suite_job_id, getpass.getuser())
    experimental = False
    if 'job_keyvals' in view:
        # The job name depends on whether it's experimental or not.
        std_job_name = view['test_name'].split('.')[0]
        exp_job_name = dynamic_suite.EXPERIMENTAL_PREFIX + std_job_name

        std_job_hash = hashlib.md5(view['test_name'].split('.')[0]).hexdigest()
        exp_job_hash = hashlib.md5(dynamic_suite.EXPERIMENTAL_PREFIX +
                                   std_job_name).hexdigest()

        if std_job_hash in view['job_keyvals']:
            job_name = view['job_keyvals'][std_job_hash]
        elif exp_job_hash in view['job_keyvals']:
            experimental = True
            job_name = view['job_keyvals'][exp_job_hash]

        # For backward compatibility.
        if std_job_name in view['job_keyvals']:
            job_name = view['job_keyvals'][std_job_name]
        elif exp_job_name in view['job_keyvals']:
            experimental = True
            job_name = view['job_keyvals'][exp_job_name]

    return job_name, experimental


class Timings(object):
    """Timings for important events during a suite.

    All timestamps are datetime.datetime objects.

    @var suite_start_time: the time the suite started.
    @var reimage_start_time: the time we started reimaging devices.
    @var reimage_end_time: the time we finished reimaging devices.
    @var tests_start_time: the time the first test started running.
    """
    download_start_time = None
    payload_end_time = None
    artifact_end_time = None
    suite_start_time = None
    reimage_times = {}  # {'hostname': (start_time, end_time)}
    tests_start_time = None
    tests_end_time = None


    def RecordTiming(self, entry):
        """Given a test report entry, extract and record pertinent time info.

        get_detailed_test_views() returns a list of entries that provide
        info about the various parts of a suite run.  This method can take
        any one of these entries and look up timestamp info we might want
        and record it.

        @param entry: an entry dict, as returned by get_details_test_views().
        """
        start_candidate = datetime.datetime.strptime(entry['test_started_time'],
                                                     job_status.TIME_FMT)
        end_candidate = datetime.datetime.strptime(entry['test_finished_time'],
                                                   job_status.TIME_FMT)
        if entry['test_name'] == 'SERVER_JOB':
            self.suite_start_time = start_candidate
        elif entry['test_name'].startswith('try_new_image'):
            if '-' in entry['test_name']:
                hostname = entry['test_name'].split('-', 1)[1]
            else:
                hostname = ''
            self.reimage_times[hostname] = (start_candidate, end_candidate)
        else:
            self._UpdateFirstTestStartTime(start_candidate)
            self._UpdateLastTestEndTime(end_candidate)
        if 'job_keyvals' in entry:
            keyvals = entry['job_keyvals']
            self.download_start_time = keyvals.get(
                dynamic_suite.DOWNLOAD_STARTED_TIME)
            self.payload_end_time = keyvals.get(
                dynamic_suite.PAYLOAD_FINISHED_TIME)
            self.artifact_end_time = keyvals.get(
                dynamic_suite.ARTIFACT_FINISHED_TIME)

    def _UpdateFirstTestStartTime(self, candidate):
        """Update self.tests_start_time, iff candidate is an earlier time.

        @param candidate: a datetime.datetime object.
        """
        if not self.tests_start_time or candidate < self.tests_start_time:
            self.tests_start_time = candidate


    def _UpdateLastTestEndTime(self, candidate):
        """Update self.tests_end_time, iff candidate is a later time.

        @param candidate: a datetime.datetime object.
        """
        if not self.tests_end_time or candidate > self.tests_end_time:
            self.tests_end_time = candidate


    def __str__(self):
        reimaging_info = ''
        for host, (start, end) in self.reimage_times.iteritems():
            reimaging_info += ('Reimaging %s started at %s\n'
                               'Reimaging %s ended at %s\n' % (host, start,
                                                               host, end))
        return ('\n'
                'Suite timings:\n'
                'Downloads started at %s\n'
                'Payload downloads ended at %s\n'
                'Suite started at %s\n'
                '%s'
                'Artifact downloads ended (at latest) at %s\n'
                'Testing started at %s\n'
                'Testing ended at %s\n' % (self.download_start_time,
                                           self.payload_end_time,
                                           self.suite_start_time,
                                           reimaging_info,
                                           self.artifact_end_time,
                                           self.tests_start_time,
                                           self.tests_end_time))


def main():
    parser, options, args = parse_options()
    if not options.mock_job_id:
        if args:
            print 'Unknown arguments: ' + str(args)
            parser.print_help()
            return
        if not options.build:
            print 'Need to specify which build to use'
            parser.print_help()
            return
        if not options.board:
            print 'Need to specify board'
            parser.print_help()
            return
        if not options.name:
            print 'Need to specify suite name'
            parser.print_help()
            return
    # convert build name from containing / to continaing only _
    log_name = 'run_suite-%s.log' % options.build.replace('/', '_')
    log_dir = os.path.join(common.autotest_dir, 'logs')
    if os.path.exists(log_dir):
        log_name = os.path.join(log_dir, log_name)
    setup_logging(logfile=log_name)

    afe = frontend_wrappers.RetryingAFE(timeout_min=options.timeout_min,
                                        delay_sec=options.delay_sec)

    wait = options.no_wait is None
    if options.mock_job_id:
        job_id = int(options.mock_job_id)
    else:
        job_id = afe.run('create_suite_job',
                         suite_name=options.name,
                         board=options.board,
                         build=options.build,
                         check_hosts=wait,
                         pool=options.pool)
    TKO = frontend_wrappers.RetryingTKO(timeout_min=options.timeout_min,
                                        delay_sec=options.delay_sec)
    logging.info('Started suite job: %s', job_id)
    # Return code that will be sent back to autotest_rpc_server.py
    # 0 = OK
    # 1 = ERROR
    # 2 = WARNING
    code = 0
    while wait and True:
        if not afe.get_jobs(id=job_id, finished=True):
            time.sleep(1)
            continue
        views = TKO.run('get_detailed_test_views', afe_job_id=job_id)
        width = len(max(map(lambda x: x['test_name'], views), key=len)) + 3

        relevant_views = filter(status_is_relevant, views)
        if not relevant_views:
            # The main suite job most likely failed in SERVER_JOB.
            relevant_views = views

        timings = Timings()
        log_links = []
        for entry in relevant_views:
            timings.RecordTiming(entry)
            entry['test_name'] = entry['test_name'].replace('SERVER_JOB',
                                                            'Suite prep')
            test_entry = entry['test_name'].ljust(width)
            logging.info("%s%s", test_entry, get_pretty_status(entry['status']))
            if entry['status'] != 'GOOD':
                logging.info("%s  %s: %s", test_entry, entry['status'],
                             entry['reason'])
                job_name, experimental = get_view_info(job_id, entry)

                log_links.append(generate_log_link(entry['test_name'],
                                                   job_name))
                if code == 1:
                    # Failed already, no need to worry further.
                    continue
                if (entry['status'] == 'WARN' or
                    (is_fail_status(entry['status']) and experimental)):
                    # Failures that produce a warning. Either a test with WARN
                    # status or any experimental test failure.
                    code = 2
                else:
                    code = 1
        logging.info(timings)
        for link in log_links:
            logging.info(link)
        break
    else:
        logging.info('Created suite job: %r', job_id)
        logging.info(generate_log_link(options.name,
                                '%s-%s' % (job_id, getpass.getuser())))
        logging.info('--no_wait specified; Exiting.')
    return code

if __name__ == "__main__":
    sys.exit(main())