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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import absolute_import, unicode_literals

import json
import logging
import mozinfo
import os

from mach.decorators import (
    Command,
    CommandArgument,
    CommandProvider,
)
from mozbuild.base import (
    MachCommandBase,
    MachCommandConditions as conditions,
)


def is_valgrind_build(cls):
    '''Must be a build with --enable-valgrind and --disable-jemalloc.'''
    defines = cls.config_environment.defines
    return 'MOZ_VALGRIND' in defines and 'MOZ_MEMORY' not in defines


@CommandProvider
class MachCommands(MachCommandBase):
    '''
    Run Valgrind tests.
    '''

    def __init__(self, context):
        MachCommandBase.__init__(self, context)

    @Command('valgrind-test', category='testing',
             conditions=[conditions.is_firefox, is_valgrind_build],
             description='Run the Valgrind test job (memory-related errors).')
    @CommandArgument('--suppressions', default=[], action='append',
                     metavar='FILENAME',
                     help='Specify a suppression file for Valgrind to use. Use '
                     '--suppression multiple times to specify multiple suppression '
                     'files.')
    def valgrind_test(self, suppressions):

        from mozfile import TemporaryDirectory
        from mozhttpd import MozHttpd
        from mozprofile import FirefoxProfile, Preferences
        from mozprofile.permissions import ServerLocations
        from mozrunner import FirefoxRunner
        from mozrunner.utils import findInPath
        from six import string_types
        from valgrind.output_handler import OutputHandler

        build_dir = os.path.join(self.topsrcdir, 'build')

        # XXX: currently we just use the PGO inputs for Valgrind runs.  This may
        # change in the future.
        httpd = MozHttpd(docroot=os.path.join(build_dir, 'pgo'))
        httpd.start(block=False)

        with TemporaryDirectory() as profilePath:
            # TODO: refactor this into mozprofile
            profile_data_dir = os.path.join(
                self.topsrcdir, 'testing', 'profiles')
            with open(os.path.join(profile_data_dir, 'profiles.json'), 'r') as fh:
                base_profiles = json.load(fh)['valgrind']

            prefpaths = [os.path.join(profile_data_dir, profile, 'user.js')
                         for profile in base_profiles]
            prefs = {}
            for path in prefpaths:
                prefs.update(Preferences.read_prefs(path))

            interpolation = {
                'server': '%s:%d' % httpd.httpd.server_address,
            }
            for k, v in prefs.items():
                if isinstance(v, string_types):
                    v = v.format(**interpolation)
                prefs[k] = Preferences.cast(v)

            quitter = os.path.join(
                self.topsrcdir, 'tools', 'quitter', 'quitter@mozilla.org.xpi')

            locations = ServerLocations()
            locations.add_host(host='127.0.0.1',
                               port=httpd.httpd.server_port,
                               options='primary')

            profile = FirefoxProfile(profile=profilePath,
                                     preferences=prefs,
                                     addons=[quitter],
                                     locations=locations)

            firefox_args = [httpd.get_url()]

            env = os.environ.copy()
            env['G_SLICE'] = 'always-malloc'
            env['MOZ_CC_RUN_DURING_SHUTDOWN'] = '1'
            env['MOZ_CRASHREPORTER_NO_REPORT'] = '1'
            env['MOZ_DISABLE_NONLOCAL_CONNECTIONS'] = '1'
            env['XPCOM_DEBUG_BREAK'] = 'warn'

            outputHandler = OutputHandler(self.log)
            kp_kwargs = {'processOutputLine': [outputHandler]}

            valgrind = 'valgrind'
            if not os.path.exists(valgrind):
                valgrind = findInPath(valgrind)

            valgrind_args = [
                valgrind,
                '--sym-offsets=yes',
                '--smc-check=all-non-file',
                '--vex-iropt-register-updates=allregs-at-mem-access',
                '--gen-suppressions=all',
                '--num-callers=36',
                '--leak-check=full',
                '--show-possibly-lost=no',
                '--track-origins=yes',
                '--trace-children=yes',
                '-v',  # Enable verbosity to get the list of used suppressions
                # Avoid excessive delays in the presence of spinlocks.
                # See bug 1309851.
                '--fair-sched=yes',
                # Keep debuginfo after library unmap.  See bug 1382280.
                '--keep-debuginfo=yes',
                # Reduce noise level on rustc and/or LLVM compiled code.
                # See bug 1365915
                '--expensive-definedness-checks=yes',
                # Compensate for the compiler inlining `new` but not `delete`
                # or vice versa.
                '--show-mismatched-frees=no',
            ]

            for s in suppressions:
                valgrind_args.append('--suppressions=' + s)

            supps_dir = os.path.join(build_dir, 'valgrind')
            supps_file1 = os.path.join(supps_dir, 'cross-architecture.sup')
            valgrind_args.append('--suppressions=' + supps_file1)

            if mozinfo.os == 'linux':
                machtype = {
                    'x86_64': 'x86_64-pc-linux-gnu',
                    'x86': 'i386-pc-linux-gnu',
                }.get(mozinfo.processor)
                if machtype:
                    supps_file2 = os.path.join(supps_dir, machtype + '.sup')
                    if os.path.isfile(supps_file2):
                        valgrind_args.append('--suppressions=' + supps_file2)

            exitcode = None
            timeout = 1800
            try:
                runner = FirefoxRunner(profile=profile,
                                       binary=self.get_binary_path(),
                                       cmdargs=firefox_args,
                                       env=env,
                                       process_args=kp_kwargs)
                runner.start(debug_args=valgrind_args)
                exitcode = runner.wait(timeout=timeout)

            finally:
                errs = outputHandler.error_count
                supps = outputHandler.suppression_count
                if errs != supps:
                    status = 1  # turns the TBPL job orange
                    self.log(logging.ERROR, 'valgrind-fail-parsing',
                             {'errs': errs, 'supps': supps},
                             'TEST-UNEXPECTED-FAIL | valgrind-test | error parsing: {errs} errors '
                             'seen, but {supps} generated suppressions seen')

                elif errs == 0:
                    status = 0
                    self.log(logging.INFO, 'valgrind-pass', {},
                             'TEST-PASS | valgrind-test | valgrind found no errors')
                else:
                    status = 1  # turns the TBPL job orange
                    # We've already printed details of the errors.

                if exitcode is None:
                    status = 2  # turns the TBPL job red
                    self.log(logging.ERROR, 'valgrind-fail-timeout',
                             {'timeout': timeout},
                             'TEST-UNEXPECTED-FAIL | valgrind-test | Valgrind timed out '
                             '(reached {timeout} second limit)')
                elif exitcode != 0:
                    status = 2  # turns the TBPL job red
                    self.log(logging.ERROR, 'valgrind-fail-errors',
                             {'exitcode': exitcode},
                             'TEST-UNEXPECTED-FAIL | valgrind-test | non-zero exit code '
                             'from Valgrind: {exitcode}')

                httpd.stop()

            return status