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"""Run Inspector's perf tests in perf mode."""

import os
import json
import logging
import optparse
import time
import datetime

from webkitpy.common import find_files
from webkitpy.common.checkout.scm.detection import SCMDetector
from webkitpy.common.config.urls import view_source_url
from webkitpy.common.host import Host
from webkitpy.common.net.file_uploader import FileUploader
from webkitpy.performance_tests.perftest import PerfTestFactory
from webkitpy.performance_tests.perftest import DEFAULT_TEST_RUNNER_COUNT


_log = logging.getLogger(__name__)


class PerfTestsRunner(object):
    _default_branch = 'webkit-trunk'
    EXIT_CODE_BAD_BUILD = -1
    EXIT_CODE_BAD_SOURCE_JSON = -2
    EXIT_CODE_BAD_MERGE = -3
    EXIT_CODE_FAILED_UPLOADING = -4
    EXIT_CODE_BAD_PREPARATION = -5

    _DEFAULT_JSON_FILENAME = 'PerformanceTestsResults.json'

    def __init__(self, args=None, port=None):
        self._options, self._args = PerfTestsRunner._parse_args(args)
        if port:
            self._port = port
            self._host = self._port.host
        else:
            self._host = Host()
            self._port = self._host.port_factory.get(self._options.platform, self._options)
        self._host.initialize_scm()
        self._webkit_base_dir_len = len(self._port.webkit_base())
        self._base_path = self._port.perf_tests_dir()
        self._timestamp = time.time()
        self._utc_timestamp = datetime.datetime.utcnow()


    @staticmethod
    def _parse_args(args=None):
        def _expand_path(option, opt_str, value, parser):
            path = os.path.expandvars(os.path.expanduser(value))
            setattr(parser.values, option.dest, path)
        perf_option_list = [
            optparse.make_option('--debug', action='store_const', const='Debug', dest="configuration",
                help='Set the configuration to Debug'),
            optparse.make_option('--release', action='store_const', const='Release', dest="configuration",
                help='Set the configuration to Release'),
            optparse.make_option("--platform",
                help="Specify port/platform being tested (e.g. mac)"),
            optparse.make_option("--chromium",
                action="store_const", const='chromium', dest='platform', help='Alias for --platform=chromium'),
            optparse.make_option("--android",
                action="store_const", const='android', dest='platform', help='Alias for --platform=android'),
            optparse.make_option("--builder-name",
                help=("The name of the builder shown on the waterfall running this script e.g. google-mac-2.")),
            optparse.make_option("--build-number",
                help=("The build number of the builder running this script.")),
            optparse.make_option("--build", dest="build", action="store_true", default=True,
                help="Check to ensure the DumpRenderTree build is up-to-date (default)."),
            optparse.make_option("--no-build", dest="build", action="store_false",
                help="Don't check to see if the DumpRenderTree build is up-to-date."),
            optparse.make_option("--build-directory",
                help="Path to the directory under which build files are kept (should not include configuration)"),
            optparse.make_option("--time-out-ms", default=600 * 1000,
                help="Set the timeout for each test"),
            optparse.make_option("--no-results", action="store_false", dest="generate_results", default=True,
                help="Do no generate results JSON and results page."),
            optparse.make_option("--output-json-path", action='callback', callback=_expand_path, type="str",
                help="Path to generate a JSON file at; may contain previous results if it already exists."),
            optparse.make_option("--reset-results", action="store_true",
                help="Clears the content in the generated JSON file before adding the results."),
            optparse.make_option("--slave-config-json-path", action='callback', callback=_expand_path, type="str",
                help="Only used on bots. Path to a slave configuration file."),
            optparse.make_option("--description",
                help="Add a description to the output JSON file if one is generated"),
            optparse.make_option("--no-show-results", action="store_false", default=True, dest="show_results",
                help="Don't launch a browser with results after the tests are done"),
            optparse.make_option("--test-results-server",
                help="Upload the generated JSON file to the specified server when --output-json-path is present."),
            optparse.make_option("--force", dest="use_skipped_list", action="store_false", default=True,
                help="Run all tests, including the ones in the Skipped list."),
            optparse.make_option("--profile", action="store_true",
                help="Output per-test profile information."),
            optparse.make_option("--profiler", action="store",
                help="Output per-test profile information, using the specified profiler."),
            optparse.make_option("--additional-driver-flag", action="append",
                default=[], help="Additional command line flag to pass to DumpRenderTree "
                     "Specify multiple times to add multiple flags."),
            optparse.make_option("--driver-name", type="string",
                help="Alternative DumpRenderTree binary to use"),
            optparse.make_option("--content-shell", action="store_true",
                help="Use Content Shell instead of DumpRenderTree"),
            optparse.make_option("--repeat", default=1, type="int",
                help="Specify number of times to run test set (default: 1)."),
            optparse.make_option("--test-runner-count", default=DEFAULT_TEST_RUNNER_COUNT, type="int",
                help="Specify number of times to invoke test runner for each performance test."),
            ]
        return optparse.OptionParser(option_list=(perf_option_list)).parse_args(args)

    def _collect_tests(self):
        test_extensions = ['.html', '.svg']

        def _is_test_file(filesystem, dirname, filename):
            return filesystem.splitext(filename)[1] in test_extensions

        filesystem = self._host.filesystem

        paths = []
        for arg in self._args:
            if filesystem.exists(filesystem.join(self._base_path, arg)):
                paths.append(arg)
            else:
                relpath = filesystem.relpath(arg, self._base_path)
                if filesystem.exists(filesystem.join(self._base_path, relpath)):
                    paths.append(filesystem.normpath(relpath))
                else:
                    _log.warn('Path was not found:' + arg)

        skipped_directories = set(['.svn', 'resources'])
        test_files = find_files.find(filesystem, self._base_path, paths, skipped_directories, _is_test_file)
        tests = []
        for path in test_files:
            relative_path = filesystem.relpath(path, self._base_path).replace('\\', '/')
            if self._options.use_skipped_list and self._port.skips_perf_test(relative_path) and filesystem.normpath(relative_path) not in paths:
                continue
            test = PerfTestFactory.create_perf_test(self._port, relative_path, path, test_runner_count=self._options.test_runner_count)
            tests.append(test)

        return tests

    def _start_http_servers(self):
        self._port.acquire_http_lock()
        self._port.start_http_server(number_of_servers=2)

    def _stop_http_servers(self):
        self._port.stop_http_server()
        self._port.release_http_lock()

    def run(self):
        needs_http = self._port.requires_http_server()

        class FakePrinter(object):
            def write_update(self, msg):
                print msg

            def write_throttled_update(self, msg):
                pass

        if self._port.check_build(needs_http=needs_http, printer=FakePrinter()):
            _log.error("Build not up to date for %s" % self._port._path_to_driver())
            return self.EXIT_CODE_BAD_BUILD

        run_count = 0
        repeat = self._options.repeat
        while (run_count < repeat):
            run_count += 1

            tests = self._collect_tests()
            runs = ' (Run %d of %d)' % (run_count, repeat) if repeat > 1 else ''
            _log.info("Running %d tests%s" % (len(tests), runs))

            for test in tests:
                if not test.prepare(self._options.time_out_ms):
                    return self.EXIT_CODE_BAD_PREPARATION

            try:
                if needs_http:
                    self._start_http_servers()
                unexpected = self._run_tests_set(sorted(list(tests), key=lambda test: test.test_name()))

            finally:
                if needs_http:
                    self._stop_http_servers()

            if self._options.generate_results and not self._options.profile:
                exit_code = self._generate_results()
                if exit_code:
                    return exit_code

        if self._options.generate_results and not self._options.profile:
            test_results_server = self._options.test_results_server
            if test_results_server and not self._upload_json(test_results_server, self._output_json_path()):
                return self.EXIT_CODE_FAILED_UPLOADING

            if self._options.show_results:
                self._port.show_results_html_file(self._results_page_path())

        return unexpected

    def _output_json_path(self):
        output_json_path = self._options.output_json_path
        if output_json_path:
            return output_json_path
        return self._host.filesystem.join(self._port.perf_results_directory(), self._DEFAULT_JSON_FILENAME)

    def _results_page_path(self):
        return self._host.filesystem.splitext(self._output_json_path())[0] + '.html'

    def _generate_results(self):
        options = self._options
        output_json_path = self._output_json_path()
        output = self._generate_results_dict(self._timestamp, options.description, options.platform, options.builder_name, options.build_number)

        if options.slave_config_json_path:
            output = self._merge_slave_config_json(options.slave_config_json_path, output)
            if not output:
                return self.EXIT_CODE_BAD_SOURCE_JSON

        output = self._merge_outputs_if_needed(output_json_path, output)
        if not output:
            return self.EXIT_CODE_BAD_MERGE

        filesystem = self._host.filesystem
        json_output = json.dumps(output)
        filesystem.write_text_file(output_json_path, json_output)

        template_path = filesystem.join(self._port.perf_tests_dir(), 'resources/results-template.html')
        template = filesystem.read_text_file(template_path)

        absolute_path_to_trunk = filesystem.dirname(self._port.perf_tests_dir())
        results_page = template.replace('%AbsolutePathToWebKitTrunk%', absolute_path_to_trunk)
        results_page = results_page.replace('%PeformanceTestsResultsJSON%', json_output)

        filesystem.write_text_file(self._results_page_path(), results_page)

    def _generate_results_dict(self, timestamp, description, platform, builder_name, build_number):
        revisions = {}
        for (name, path) in self._port.repository_paths():
            scm = SCMDetector(self._host.filesystem, self._host.executive).detect_scm_system(path) or self._host.scm()
            revision = scm.svn_revision(path)
            revisions[name] = {'revision': revision, 'timestamp': scm.timestamp_of_revision(path, revision)}

        meta_info = {
            'description': description,
            'buildTime': self._datetime_in_ES5_compatible_iso_format(self._utc_timestamp),
            'platform': platform,
            'revisions': revisions,
            'builderName': builder_name,
            'buildNumber': int(build_number) if build_number else None}

        contents = {'tests': {}}
        for key, value in meta_info.items():
            if value:
                contents[key] = value

        for test, metrics in self._results:
            for metric_name, iteration_values in metrics.iteritems():
                if not isinstance(iteration_values, list):  # We can't reports results without individual measurements.
                    continue

                tests = contents['tests']
                path = test.test_name_without_file_extension().split('/')
                for i in range(0, len(path)):
                    is_last_token = i + 1 == len(path)
                    url = view_source_url('PerformanceTests/' + (test.test_name() if is_last_token else '/'.join(path[0:i + 1])))
                    tests.setdefault(path[i], {'url': url})
                    current_test = tests[path[i]]
                    if is_last_token:
                        current_test.setdefault('metrics', {})
                        assert metric_name not in current_test['metrics']
                        current_test['metrics'][metric_name] = {'current': iteration_values}
                    else:
                        current_test.setdefault('tests', {})
                        tests = current_test['tests']

        return contents

    @staticmethod
    def _datetime_in_ES5_compatible_iso_format(datetime):
        return datetime.strftime('%Y-%m-%dT%H:%M:%S.%f')

    def _merge_slave_config_json(self, slave_config_json_path, contents):
        if not self._host.filesystem.isfile(slave_config_json_path):
            _log.error("Missing slave configuration JSON file: %s" % slave_config_json_path)
            return None

        try:
            slave_config_json = self._host.filesystem.open_text_file_for_reading(slave_config_json_path)
            slave_config = json.load(slave_config_json)
            for key in slave_config:
                contents['builder' + key.capitalize()] = slave_config[key]
            return contents
        except Exception, error:
            _log.error("Failed to merge slave configuration JSON file %s: %s" % (slave_config_json_path, error))
        return None

    def _merge_outputs_if_needed(self, output_json_path, output):
        if self._options.reset_results or not self._host.filesystem.isfile(output_json_path):
            return [output]
        try:
            existing_outputs = json.loads(self._host.filesystem.read_text_file(output_json_path))
            return existing_outputs + [output]
        except Exception, error:
            _log.error("Failed to merge output JSON file %s: %s" % (output_json_path, error))
        return None

    def _upload_json(self, test_results_server, json_path, host_path="/api/report", file_uploader=FileUploader):
        url = "https://%s%s" % (test_results_server, host_path)
        uploader = file_uploader(url, 120)
        try:
            response = uploader.upload_single_text_file(self._host.filesystem, 'application/json', json_path)
        except Exception, error:
            _log.error("Failed to upload JSON file to %s in 120s: %s" % (url, error))
            return False

        response_body = [line.strip('\n') for line in response]
        if response_body != ['OK']:
            try:
                parsed_response = json.loads('\n'.join(response_body))
            except:
                _log.error("Uploaded JSON to %s but got a bad response:" % url)
                for line in response_body:
                    _log.error(line)
                return False
            if parsed_response.get('status') != 'OK':
                _log.error("Uploaded JSON to %s but got an error:" % url)
                _log.error(json.dumps(parsed_response, indent=4))
                return False

        _log.info("JSON file uploaded to %s." % url)
        return True

    def _run_tests_set(self, tests):
        result_count = len(tests)
        failures = 0
        self._results = []

        for i, test in enumerate(tests):
            _log.info('Running %s (%d of %d)' % (test.test_name(), i + 1, len(tests)))
            start_time = time.time()
            metrics = test.run(self._options.time_out_ms)
            if metrics:
                self._results.append((test, metrics))
            else:
                failures += 1
                _log.error('FAILED')

            _log.info('Finished: %f s' % (time.time() - start_time))
            _log.info('')

        return failures
