run_tests.py

#!/usr/bin/env python2.7
# Copyright 2015, Google Inc.
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# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""Run tests in parallel."""

import argparse
import ast
import collections
import glob
import itertools
import json
import multiprocessing
import os
import os.path
import platform
import random
import re
import socket
import subprocess
import sys
import tempfile
import traceback
import time
import urllib2
import uuid

import jobset
import report_utils
import watch_dirs


_ROOT = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), '../..'))
os.chdir(_ROOT)


_FORCE_ENVIRON_FOR_WRAPPERS = {}


_POLLING_STRATEGIES = {
  'linux': ['epoll', 'poll', 'legacy']
}


def platform_string():
  return jobset.platform_string()


# SimpleConfig: just compile with CONFIG=config, and run the binary to test
class Config(object):

  def __init__(self, config, environ=None, timeout_multiplier=1, tool_prefix=[]):
    if environ is None:
      environ = {}
    self.build_config = config
    self.environ = environ
    self.environ['CONFIG'] = config
    self.tool_prefix = tool_prefix
    self.timeout_multiplier = timeout_multiplier

  def job_spec(self, cmdline, timeout_seconds=5*60,
               shortname=None, environ={}, cpu_cost=1.0, flaky=False):
    """Construct a jobset.JobSpec for a test under this config

       Args:
         cmdline:      a list of strings specifying the command line the test
                       would like to run
    """
    actual_environ = self.environ.copy()
    for k, v in environ.iteritems():
      actual_environ[k] = v
    return jobset.JobSpec(cmdline=self.tool_prefix + cmdline,
                          shortname=shortname,
                          environ=actual_environ,
                          cpu_cost=cpu_cost,
                          timeout_seconds=(self.timeout_multiplier * timeout_seconds if timeout_seconds else None),
                          flake_retries=5 if flaky or args.allow_flakes else 0,
                          timeout_retries=3 if args.allow_flakes else 0)


def get_c_tests(travis, test_lang) :
  out = []
  platforms_str = 'ci_platforms' if travis else 'platforms'
  with open('tools/run_tests/tests.json') as f:
    js = json.load(f)
    return [tgt
            for tgt in js
            if tgt['language'] == test_lang and
                platform_string() in tgt[platforms_str] and
                not (travis and tgt['flaky'])]


def _check_compiler(compiler, supported_compilers):
  if compiler not in supported_compilers:
    raise Exception('Compiler %s not supported (on this platform).' % compiler)


def _check_arch(arch, supported_archs):
  if arch not in supported_archs:
    raise Exception('Architecture %s not supported.' % arch)


def _is_use_docker_child():
  """Returns True if running running as a --use_docker child."""
  return True if os.getenv('RUN_TESTS_COMMAND') else False


class CLanguage(object):

  def __init__(self, make_target, test_lang):
    self.make_target = make_target
    self.platform = platform_string()
    self.test_lang = test_lang

  def configure(self, config, args):
    self.config = config
    self.args = args
    if self.platform == 'windows':
      self._make_options = [_windows_toolset_option(self.args.compiler),
                            _windows_arch_option(self.args.arch)]
    else:
      self._docker_distro, self._make_options = self._compiler_options(self.args.use_docker,
                                                                       self.args.compiler)

  def test_specs(self):
    out = []
    binaries = get_c_tests(self.args.travis, self.test_lang)
    for target in binaries:
      polling_strategies = (_POLLING_STRATEGIES.get(self.platform, ['all'])
                            if target.get('uses_polling', True)
                            else ['all'])
      for polling_strategy in polling_strategies:
        env={'GRPC_DEFAULT_SSL_ROOTS_FILE_PATH':
                 _ROOT + '/src/core/lib/tsi/test_creds/ca.pem',
             'GRPC_POLL_STRATEGY': polling_strategy}
        shortname_ext = '' if polling_strategy=='all' else ' polling=%s' % polling_strategy
        if self.config.build_config in target['exclude_configs']:
          continue
        if self.platform == 'windows':
          binary = 'vsprojects/%s%s/%s.exe' % (
              'x64/' if self.args.arch == 'x64' else '',
              _MSBUILD_CONFIG[self.config.build_config],
              target['name'])
        else:
          binary = 'bins/%s/%s' % (self.config.build_config, target['name'])
        if os.path.isfile(binary):
          if 'gtest' in target and target['gtest']:
            # here we parse the output of --gtest_list_tests to build up a
            # complete list of the tests contained in a binary
            # for each test, we then add a job to run, filtering for just that
            # test
            with open(os.devnull, 'w') as fnull:
              tests = subprocess.check_output([binary, '--gtest_list_tests'],
                                              stderr=fnull)
            base = None
            for line in tests.split('\n'):
              i = line.find('#')
              if i >= 0: line = line[:i]
              if not line: continue
              if line[0] != ' ':
                base = line.strip()
              else:
                assert base is not None
                assert line[1] == ' '
                test = base + line.strip()
                cmdline = [binary] + ['--gtest_filter=%s' % test]
                out.append(self.config.job_spec(cmdline, [binary],
                                                shortname='%s:%s %s' % (binary, test, shortname_ext),
                                                cpu_cost=target['cpu_cost'],
                                                environ=env))
          else:
            cmdline = [binary] + target['args']
            out.append(self.config.job_spec(cmdline, [binary],
                                            shortname=' '.join(cmdline) + shortname_ext,
                                            cpu_cost=target['cpu_cost'],
                                            flaky=target.get('flaky', False),
                                            environ=env))
        elif self.args.regex == '.*' or self.platform == 'windows':
          print '\nWARNING: binary not found, skipping', binary
    return sorted(out)

  def make_targets(self):
    if self.platform == 'windows':
      # don't build tools on windows just yet
      return ['buildtests_%s' % self.make_target]
    return ['buildtests_%s' % self.make_target, 'tools_%s' % self.make_target]

  def make_options(self):
    return self._make_options;

  def pre_build_steps(self):
    if self.platform == 'windows':
      return [['tools\\run_tests\\pre_build_c.bat']]
    else:
      return []

  def build_steps(self):
    return []

  def post_tests_steps(self):
    if self.platform == 'windows':
      return []
    else:
      return [['tools/run_tests/post_tests_c.sh']]

  def makefile_name(self):
    return 'Makefile'

  def _clang_make_options(self, version_suffix=''):
    return ['CC=clang%s' % version_suffix,
            'CXX=clang++%s' % version_suffix,
            'LD=clang%s' % version_suffix,
            'LDXX=clang++%s' % version_suffix]

  def _gcc_make_options(self, version_suffix):
    return ['CC=gcc%s' % version_suffix,
            'CXX=g++%s' % version_suffix,
            'LD=gcc%s' % version_suffix,
            'LDXX=g++%s' % version_suffix]

  def _compiler_options(self, use_docker, compiler):
    """Returns docker distro and make options to use for given compiler."""
    if not use_docker and not _is_use_docker_child():
      _check_compiler(compiler, ['default'])

    if compiler == 'gcc4.9' or compiler == 'default':
      return ('jessie', [])
    elif compiler == 'gcc4.4':
      return ('wheezy', self._gcc_make_options(version_suffix='-4.4'))
    elif compiler == 'gcc4.6':
      return ('wheezy', self._gcc_make_options(version_suffix='-4.6'))
    elif compiler == 'gcc5.3':
      return ('ubuntu1604', [])
    elif compiler == 'clang3.4':
      # on ubuntu1404, clang-3.4 alias doesn't exist, just use 'clang'
      return ('ubuntu1404', self._clang_make_options())
    elif compiler == 'clang3.5':
      return ('jessie', self._clang_make_options(version_suffix='-3.5'))
    elif compiler == 'clang3.6':
      return ('ubuntu1604', self._clang_make_options(version_suffix='-3.6'))
    elif compiler == 'clang3.7':
      return ('ubuntu1604', self._clang_make_options(version_suffix='-3.7'))
    else:
      raise Exception('Compiler %s not supported.' % compiler)

  def dockerfile_dir(self):
    return 'tools/dockerfile/test/cxx_%s_%s' % (self._docker_distro,
                                                _docker_arch_suffix(self.args.arch))

  def __str__(self):
    return self.make_target


class NodeLanguage(object):

  def __init__(self):
    self.platform = platform_string()

  def configure(self, config, args):
    self.config = config
    self.args = args
    _check_compiler(self.args.compiler, ['default', 'node0.12',
                                         'node4', 'node5'])
    if self.args.compiler == 'default':
      self.node_version = '4'
    else:
      # Take off the word "node"
      self.node_version = self.args.compiler[4:]

  def test_specs(self):
    if self.platform == 'windows':
      return [self.config.job_spec(['tools\\run_tests\\run_node.bat'], None)]
    else:
      return [self.config.job_spec(['tools/run_tests/run_node.sh', self.node_version],
                                   None,
                                   environ=_FORCE_ENVIRON_FOR_WRAPPERS)]

  def pre_build_steps(self):
    if self.platform == 'windows':
      return [['tools\\run_tests\\pre_build_node.bat']]
    else:
      return [['tools/run_tests/pre_build_node.sh', self.node_version]]

  def make_targets(self):
    return []

  def make_options(self):
    return []

  def build_steps(self):
    if self.platform == 'windows':
      return [['tools\\run_tests\\build_node.bat']]
    else:
      return [['tools/run_tests/build_node.sh', self.node_version]]

  def post_tests_steps(self):
    return []

  def makefile_name(self):
    return 'Makefile'

  def dockerfile_dir(self):
    return 'tools/dockerfile/test/node_jessie_%s' % _docker_arch_suffix(self.args.arch)

  def __str__(self):
    return 'node'


class PhpLanguage(object):

  def configure(self, config, args):
    self.config = config
    self.args = args
    _check_compiler(self.args.compiler, ['default'])

  def test_specs(self):
    return [self.config.job_spec(['src/php/bin/run_tests.sh'], None,
                                  environ=_FORCE_ENVIRON_FOR_WRAPPERS)]

  def pre_build_steps(self):
    return []

  def make_targets(self):
    return ['static_c', 'shared_c']

  def make_options(self):
    return []

  def build_steps(self):
    return [['tools/run_tests/build_php.sh']]

  def post_tests_steps(self):
    return [['tools/run_tests/post_tests_php.sh']]

  def makefile_name(self):
    return 'Makefile'

  def dockerfile_dir(self):
    return 'tools/dockerfile/test/php_jessie_%s' % _docker_arch_suffix(self.args.arch)

  def __str__(self):
    return 'php'


class PythonConfig(collections.namedtuple('PythonConfig', [
    'name', 'build', 'run'])):
  """Tuple of commands (named s.t. 'what it says on the tin' applies)"""

class PythonLanguage(object):

  def configure(self, config, args):
    self.config = config
    self.args = args
    self.pythons = self._get_pythons(self.args)

  def test_specs(self):
    # load list of known test suites
    with open('src/python/grpcio_tests/tests/tests.json') as tests_json_file:
      tests_json = json.load(tests_json_file)
    environment = dict(_FORCE_ENVIRON_FOR_WRAPPERS)
    return [self.config.job_spec(
        config.run,
        timeout_seconds=5*60,
        environ=dict(environment.items() +
                     [('GRPC_PYTHON_TESTRUNNER_FILTER', suite_name)]),
        shortname='%s.test.%s' % (config.name, suite_name),)
        for suite_name in tests_json
        for config in self.pythons]

  def pre_build_steps(self):
    return []

  def make_targets(self):
    return []

  def make_options(self):
    return []

  def build_steps(self):
    return [config.build for config in self.pythons]

  def post_tests_steps(self):
    return []

  def makefile_name(self):
    return 'Makefile'

  def dockerfile_dir(self):
    return 'tools/dockerfile/test/python_jessie_%s' % _docker_arch_suffix(self.args.arch)

  def _get_pythons(self, args):
    if args.arch == 'x86':
      bits = '32'
    else:
      bits = '64'
    if os.name == 'nt':
      shell = ['bash']
      builder = [os.path.abspath('tools/run_tests/build_python_msys2.sh')]
      builder_prefix_arguments = ['MINGW{}'.format(bits)]
      venv_relative_python = ['Scripts/python.exe']
      toolchain = ['mingw32']
      python_pattern_function = lambda major, minor, bits: (
          '/c/Python{major}{minor}/python.exe'.format(major=major, minor=minor, bits=bits)
	  if bits == '64' else
	  '/c/Python{major}{minor}_{bits}bits/python.exe'.format(
              major=major, minor=minor, bits=bits))
    else:
      shell = []
      builder = [os.path.abspath('tools/run_tests/build_python.sh')]
      builder_prefix_arguments = []
      venv_relative_python = ['bin/python']
      toolchain = ['unix']
      # Bit-ness is handled by the test machine's environment
      python_pattern_function = lambda major, minor, bits: 'python{major}.{minor}'.format(major=major, minor=minor)
    runner = [os.path.abspath('tools/run_tests/run_python.sh')]
    python_config_generator = lambda name, major, minor, bits: PythonConfig(
        name,
        shell + builder + builder_prefix_arguments
	    + [python_pattern_function(major=major, minor=minor, bits=bits)]
	    + [name] + venv_relative_python + toolchain,
        shell + runner + [os.path.join(name, venv_relative_python[0])])
    python27_config = python_config_generator(name='py27', major='2', minor='7', bits=bits)
    python34_config = python_config_generator(name='py34', major='3', minor='4', bits=bits)
    if args.compiler == 'default':
      if os.name == 'nt':
        return (python27_config,)
      else:
        return (python27_config, python34_config,)
    elif args.compiler == 'python2.7':
      return (python27_config,)
    elif args.compiler == 'python3.4':
      return (python34_config,)
    else:
      raise Exception('Compiler %s not supported.' % args.compiler)

  def __str__(self):
    return 'python'


class RubyLanguage(object):

  def configure(self, config, args):
    self.config = config
    self.args = args
    _check_compiler(self.args.compiler, ['default'])

  def test_specs(self):
    return [self.config.job_spec(['tools/run_tests/run_ruby.sh'],
                                 timeout_seconds=10*60,
                                 environ=_FORCE_ENVIRON_FOR_WRAPPERS)]

  def pre_build_steps(self):
    return [['tools/run_tests/pre_build_ruby.sh']]

  def make_targets(self):
    return []

  def make_options(self):
    return []

  def build_steps(self):
    return [['tools/run_tests/build_ruby.sh']]

  def post_tests_steps(self):
    return [['tools/run_tests/post_tests_ruby.sh']]

  def makefile_name(self):
    return 'Makefile'

  def dockerfile_dir(self):
    return 'tools/dockerfile/test/ruby_jessie_%s' % _docker_arch_suffix(self.args.arch)

  def __str__(self):
    return 'ruby'


class CSharpLanguage(object):

  def __init__(self):
    self.platform = platform_string()

  def configure(self, config, args):
    self.config = config
    self.args = args
    if self.platform == 'windows':
      # Explicitly choosing between x86 and x64 arch doesn't work yet
      _check_arch(self.args.arch, ['default'])
      # CoreCLR use 64bit runtime by default.
      arch_option = 'x64' if self.args.compiler == 'coreclr' else self.args.arch
      self._make_options = [_windows_toolset_option(self.args.compiler),
                            _windows_arch_option(arch_option)]
    else:
      _check_compiler(self.args.compiler, ['default', 'coreclr'])
      if self.platform == 'linux' and self.args.compiler == 'coreclr':
        self._docker_distro = 'coreclr'
      else:
        self._docker_distro = 'jessie'

      if self.platform == 'mac':
        # TODO(jtattermusch): EMBED_ZLIB=true currently breaks the mac build
        self._make_options = ['EMBED_OPENSSL=true']
        if self.args.compiler != 'coreclr':
          # On Mac, official distribution of mono is 32bit.
          self._make_options += ['CFLAGS=-m32', 'LDFLAGS=-m32']
      else:
        self._make_options = ['EMBED_OPENSSL=true', 'EMBED_ZLIB=true']

  def test_specs(self):
    with open('src/csharp/tests.json') as f:
      tests_by_assembly = json.load(f)

    msbuild_config = _MSBUILD_CONFIG[self.config.build_config]
    nunit_args = ['--labels=All']
    assembly_subdir = 'bin/%s' % msbuild_config
    assembly_extension = '.exe'

    if self.args.compiler == 'coreclr':
      if self.platform == 'linux':
        assembly_subdir += '/netstandard1.5/debian.8-x64'
        assembly_extension = ''
      elif self.platform == 'mac':
        assembly_subdir += '/netstandard1.5/osx.10.11-x64'
        assembly_extension = ''
      else:
        assembly_subdir += '/netstandard1.5/win7-x64'
      runtime_cmd = []
    else:
      nunit_args += ['--noresult', '--workers=1']
      if self.platform == 'windows':
        runtime_cmd = []
      else:
        runtime_cmd = ['mono']

    specs = []
    for assembly in tests_by_assembly.iterkeys():
      assembly_file = 'src/csharp/%s/%s/%s%s' % (assembly,
                                                 assembly_subdir,
                                                 assembly,
                                                 assembly_extension)
      if self.config.build_config != 'gcov' or self.platform != 'windows':
        # normally, run each test as a separate process
        for test in tests_by_assembly[assembly]:
          cmdline = runtime_cmd + [assembly_file, '--test=%s' % test] + nunit_args
          specs.append(self.config.job_spec(cmdline,
                                            None,
                                            shortname='csharp.%s' % test,
                                            environ=_FORCE_ENVIRON_FOR_WRAPPERS))
      else:
        # For C# test coverage, run all tests from the same assembly at once
        # using OpenCover.Console (only works on Windows).
        cmdline = ['src\\csharp\\packages\\OpenCover.4.6.519\\tools\\OpenCover.Console.exe',
                   '-target:%s' % assembly_file,
                   '-targetdir:src\\csharp',
                   '-targetargs:%s' % ' '.join(nunit_args),
                   '-filter:+[Grpc.Core]*',
                   '-register:user',
                   '-output:src\\csharp\\coverage_csharp_%s.xml' % assembly]

        # set really high cpu_cost to make sure instances of OpenCover.Console run exclusively
        # to prevent problems with registering the profiler.
        run_exclusive = 1000000
        specs.append(self.config.job_spec(cmdline,
                                          None,
                                          shortname='csharp.coverage.%s' % assembly,
                                          cpu_cost=run_exclusive,
                                          environ=_FORCE_ENVIRON_FOR_WRAPPERS))
    return specs

  def pre_build_steps(self):
    if self.platform == 'windows':
      return [['tools\\run_tests\\pre_build_csharp.bat']]
    else:
      return [['tools/run_tests/pre_build_csharp.sh']]

  def make_targets(self):
    return ['grpc_csharp_ext']

  def make_options(self):
    return self._make_options;

  def build_steps(self):
    if self.args.compiler == 'coreclr':
      if self.platform == 'windows':
        return [['tools\\run_tests\\build_csharp_coreclr.bat']]
      else:
        return [['tools/run_tests/build_csharp_coreclr.sh']]
    else:
      if self.platform == 'windows':
        return [[_windows_build_bat(self.args.compiler),
                 'src/csharp/Grpc.sln',
                 '/p:Configuration=%s' % _MSBUILD_CONFIG[self.config.build_config]]]
      else:
        return [['tools/run_tests/build_csharp.sh']]

  def post_tests_steps(self):
    if self.platform == 'windows':
      return [['tools\\run_tests\\post_tests_csharp.bat']]
    else:
      return [['tools/run_tests/post_tests_csharp.sh']]

  def makefile_name(self):
    return 'Makefile'

  def dockerfile_dir(self):
    return 'tools/dockerfile/test/csharp_%s_%s' % (self._docker_distro,
                                                   _docker_arch_suffix(self.args.arch))

  def __str__(self):
    return 'csharp'


class ObjCLanguage(object):

  def configure(self, config, args):
    self.config = config
    self.args = args
    _check_compiler(self.args.compiler, ['default'])

  def test_specs(self):
    return [self.config.job_spec(['src/objective-c/tests/run_tests.sh'],
                                 timeout_seconds=None,
                                 shortname='objc-tests',
                                 environ=_FORCE_ENVIRON_FOR_WRAPPERS),
            self.config.job_spec(['src/objective-c/tests/build_example_test.sh'],
                                 timeout_seconds=15*60,
                                 shortname='objc-examples-build',
                                 environ=_FORCE_ENVIRON_FOR_WRAPPERS)]

  def pre_build_steps(self):
    return []

  def make_targets(self):
    return ['grpc_objective_c_plugin', 'interop_server']

  def make_options(self):
    return []

  def build_steps(self):
    return [['src/objective-c/tests/build_tests.sh']]

  def post_tests_steps(self):
    return []

  def makefile_name(self):
    return 'Makefile'

  def dockerfile_dir(self):
    return None

  def __str__(self):
    return 'objc'


class Sanity(object):

  def configure(self, config, args):
    self.config = config
    self.args = args
    _check_compiler(self.args.compiler, ['default'])

  def test_specs(self):
    import yaml
    with open('tools/run_tests/sanity/sanity_tests.yaml', 'r') as f:
      return [self.config.job_spec(cmd['script'].split(),
                                   timeout_seconds=None, environ={'TEST': 'true'},
                                   cpu_cost=cmd.get('cpu_cost', 1))
              for cmd in yaml.load(f)]

  def pre_build_steps(self):
    return []

  def make_targets(self):
    return ['run_dep_checks']

  def make_options(self):
    return []

  def build_steps(self):
    return []

  def post_tests_steps(self):
    return []

  def makefile_name(self):
    return 'Makefile'

  def dockerfile_dir(self):
    return 'tools/dockerfile/test/sanity'

  def __str__(self):
    return 'sanity'


# different configurations we can run under
with open('tools/run_tests/configs.json') as f:
  _CONFIGS = dict((cfg['config'], Config(**cfg)) for cfg in ast.literal_eval(f.read()))


_LANGUAGES = {
    'c++': CLanguage('cxx', 'c++'),
    'c': CLanguage('c', 'c'),
    'node': NodeLanguage(),
    'php': PhpLanguage(),
    'python': PythonLanguage(),
    'ruby': RubyLanguage(),
    'csharp': CSharpLanguage(),
    'objc' : ObjCLanguage(),
    'sanity': Sanity()
    }


_MSBUILD_CONFIG = {
    'dbg': 'Debug',
    'opt': 'Release',
    'gcov': 'Debug',
    }


def _windows_arch_option(arch):
  """Returns msbuild cmdline option for selected architecture."""
  if arch == 'default' or arch == 'x86':
    return '/p:Platform=Win32'
  elif arch == 'x64':
    return '/p:Platform=x64'
  else:
    print 'Architecture %s not supported.' % arch
    sys.exit(1)


def _check_arch_option(arch):
  """Checks that architecture option is valid."""
  if platform_string() == 'windows':
    _windows_arch_option(arch)
  elif platform_string() == 'linux':
    # On linux, we need to be running under docker with the right architecture.
    runtime_arch = platform.architecture()[0]
    if arch == 'default':
      return
    elif runtime_arch == '64bit' and arch == 'x64':
      return
    elif runtime_arch == '32bit' and arch == 'x86':
      return
    else:
      print 'Architecture %s does not match current runtime architecture.' % arch
      sys.exit(1)
  else:
    if args.arch != 'default':
      print 'Architecture %s not supported on current platform.' % args.arch
      sys.exit(1)


def _windows_build_bat(compiler):
  """Returns name of build.bat for selected compiler."""
  # For CoreCLR, fall back to the default compiler for C core
  if compiler == 'default' or compiler == 'vs2013' or compiler == 'coreclr':
    return 'vsprojects\\build_vs2013.bat'
  elif compiler == 'vs2015':
    return 'vsprojects\\build_vs2015.bat'
  elif compiler == 'vs2010':
    return 'vsprojects\\build_vs2010.bat'
  else:
    print 'Compiler %s not supported.' % compiler
    sys.exit(1)


def _windows_toolset_option(compiler):
  """Returns msbuild PlatformToolset for selected compiler."""
  # For CoreCLR, fall back to the default compiler for C core
  if compiler == 'default' or compiler == 'vs2013' or compiler == 'coreclr':
    return '/p:PlatformToolset=v120'
  elif compiler == 'vs2015':
    return '/p:PlatformToolset=v140'
  elif compiler == 'vs2010':
    return '/p:PlatformToolset=v100'
  else:
    print 'Compiler %s not supported.' % compiler
    sys.exit(1)


def _docker_arch_suffix(arch):
  """Returns suffix to dockerfile dir to use."""
  if arch == 'default' or arch == 'x64':
    return 'x64'
  elif arch == 'x86':
    return 'x86'
  else:
    print 'Architecture %s not supported with current settings.' % arch
    sys.exit(1)


def runs_per_test_type(arg_str):
    """Auxilary function to parse the "runs_per_test" flag.

       Returns:
           A positive integer or 0, the latter indicating an infinite number of
           runs.

       Raises:
           argparse.ArgumentTypeError: Upon invalid input.
    """
    if arg_str == 'inf':
        return 0
    try:
        n = int(arg_str)
        if n <= 0: raise ValueError
        return n
    except:
        msg = '\'{}\' is not a positive integer or \'inf\''.format(arg_str)
        raise argparse.ArgumentTypeError(msg)

# parse command line
argp = argparse.ArgumentParser(description='Run grpc tests.')
argp.add_argument('-c', '--config',
                  choices=sorted(_CONFIGS.keys()),
                  default='opt')
argp.add_argument('-n', '--runs_per_test', default=1, type=runs_per_test_type,
        help='A positive integer or "inf". If "inf", all tests will run in an '
             'infinite loop. Especially useful in combination with "-f"')
argp.add_argument('-r', '--regex', default='.*', type=str)
argp.add_argument('--regex_exclude', default='', type=str)
argp.add_argument('-j', '--jobs', default=multiprocessing.cpu_count(), type=int)
argp.add_argument('-s', '--slowdown', default=1.0, type=float)
argp.add_argument('-f', '--forever',
                  default=False,
                  action='store_const',
                  const=True)
argp.add_argument('-t', '--travis',
                  default=False,
                  action='store_const',
                  const=True)
argp.add_argument('--newline_on_success',
                  default=False,
                  action='store_const',
                  const=True)
argp.add_argument('-l', '--language',
                  choices=['all'] + sorted(_LANGUAGES.keys()),
                  nargs='+',
                  default=['all'])
argp.add_argument('-S', '--stop_on_failure',
                  default=False,
                  action='store_const',
                  const=True)
argp.add_argument('--use_docker',
                  default=False,
                  action='store_const',
                  const=True,
                  help='Run all the tests under docker. That provides ' +
                  'additional isolation and prevents the need to install ' +
                  'language specific prerequisites. Only available on Linux.')
argp.add_argument('--allow_flakes',
                  default=False,
                  action='store_const',
                  const=True,
                  help='Allow flaky tests to show as passing (re-runs failed tests up to five times)')
argp.add_argument('--arch',
                  choices=['default', 'x86', 'x64'],
                  default='default',
                  help='Selects architecture to target. For some platforms "default" is the only supported choice.')
argp.add_argument('--compiler',
                  choices=['default',
                           'gcc4.4', 'gcc4.6', 'gcc4.9', 'gcc5.3',
                           'clang3.4', 'clang3.5', 'clang3.6', 'clang3.7',
                           'vs2010', 'vs2013', 'vs2015',
                           'python2.7', 'python3.4',
                           'node0.12', 'node4', 'node5',
                           'coreclr'],
                  default='default',
                  help='Selects compiler to use. Allowed values depend on the platform and language.')
argp.add_argument('--build_only',
                  default=False,
                  action='store_const',
                  const=True,
                  help='Perform all the build steps but dont run any tests.')
argp.add_argument('--measure_cpu_costs', default=False, action='store_const', const=True,
                  help='Measure the cpu costs of tests')
argp.add_argument('--update_submodules', default=[], nargs='*',
                  help='Update some submodules before building. If any are updated, also run generate_projects. ' +
                       'Submodules are specified as SUBMODULE_NAME:BRANCH; if BRANCH is omitted, master is assumed.')
argp.add_argument('-a', '--antagonists', default=0, type=int)
argp.add_argument('-x', '--xml_report', default=None, type=str,
        help='Generates a JUnit-compatible XML report')
argp.add_argument('--force_default_poller', default=False, action='store_const', const=True,
                  help='Dont try to iterate over many polling strategies when they exist')
args = argp.parse_args()

if args.force_default_poller:
  _POLLING_STRATEGIES = {}

jobset.measure_cpu_costs = args.measure_cpu_costs

# update submodules if necessary
need_to_regenerate_projects = False
for spec in args.update_submodules:
  spec = spec.split(':', 1)
  if len(spec) == 1:
    submodule = spec[0]
    branch = 'master'
  elif len(spec) == 2:
    submodule = spec[0]
    branch = spec[1]
  cwd = 'third_party/%s' % submodule
  def git(cmd, cwd=cwd):
    print 'in %s: git %s' % (cwd, cmd)
    subprocess.check_call('git %s' % cmd, cwd=cwd, shell=True)
  git('fetch')
  git('checkout %s' % branch)
  git('pull origin %s' % branch)
  if os.path.exists('src/%s/gen_build_yaml.py' % submodule):
    need_to_regenerate_projects = True
if need_to_regenerate_projects:
  if jobset.platform_string() == 'linux':
    subprocess.check_call('tools/buildgen/generate_projects.sh', shell=True)
  else:
    print 'WARNING: may need to regenerate projects, but since we are not on'
    print '         Linux this step is being skipped. Compilation MAY fail.'


# grab config
run_config = _CONFIGS[args.config]
build_config = run_config.build_config

if args.travis:
  _FORCE_ENVIRON_FOR_WRAPPERS = {'GRPC_TRACE': 'api'}

if 'all' in args.language:
  lang_list = _LANGUAGES.keys()
else:
  lang_list = args.language
# We don't support code coverage on some languages
if 'gcov' in args.config:
  for bad in ['objc', 'sanity']:
    if bad in lang_list:
      lang_list.remove(bad)

languages = set(_LANGUAGES[l] for l in lang_list)
for l in languages:
  l.configure(run_config, args)

language_make_options=[]
if any(language.make_options() for language in languages):
  if not 'gcov' in args.config and len(languages) != 1:
    print 'languages with custom make options cannot be built simultaneously with other languages'
    sys.exit(1)
  else:
    language_make_options = next(iter(languages)).make_options()

if args.use_docker:
  if not args.travis:
    print 'Seen --use_docker flag, will run tests under docker.'
    print
    print 'IMPORTANT: The changes you are testing need to be locally committed'
    print 'because only the committed changes in the current branch will be'
    print 'copied to the docker environment.'
    time.sleep(5)

  dockerfile_dirs = set([l.dockerfile_dir() for l in languages])
  if len(dockerfile_dirs) > 1:
    if 'gcov' in args.config:
      dockerfile_dir = 'tools/dockerfile/test/multilang_jessie_x64'
      print ('Using multilang_jessie_x64 docker image for code coverage for '
             'all languages.')
    else:
      print ('Languages to be tested require running under different docker '
             'images.')
      sys.exit(1)
  else:
    dockerfile_dir = next(iter(dockerfile_dirs))

  child_argv = [ arg for arg in sys.argv if not arg == '--use_docker' ]
  run_tests_cmd = 'python tools/run_tests/run_tests.py %s' % ' '.join(child_argv[1:])

  env = os.environ.copy()
  env['RUN_TESTS_COMMAND'] = run_tests_cmd
  env['DOCKERFILE_DIR'] = dockerfile_dir