Initial checkin of gRPC to third_party/

third_party/grpc/tools/run_tests/run_tests.py

Index: third_party/grpc/tools/run_tests/run_tests.py
diff --git a/third_party/grpc/tools/run_tests/run_tests.py b/third_party/grpc/tools/run_tests/run_tests.py
new file mode 100755
index 0000000000000000000000000000000000000000..2df82adf0a7ed54a99ec3939d3ff371584848b0a
--- /dev/null
+++ b/third_party/grpc/tools/run_tests/run_tests.py
@@ -0,0 +1,1229 @@
+#!/usr/bin/env python2.7
+# Copyright 2015-2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Run tests in parallel."""
+
+import argparse
+import ast
+import glob
+import hashlib
+import itertools
+import json
+import multiprocessing
+import os
+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 = {}
+
+
+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.allow_hashing = (config != 'gcov')
+    self.environ = environ
+    self.environ['CONFIG'] = config
+    self.tool_prefix = tool_prefix
+    self.timeout_multiplier = timeout_multiplier
+
+  def job_spec(self, cmdline, hash_targets, timeout_seconds=5*60,
+               shortname=None, environ={}, cpu_cost=1.0):
+    """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
+         hash_targets: either None (don't do caching of test results), or
+                       a list of strings specifying files to include in a
+                       binary hash to check if a test has changed
+                       -- if used, all artifacts needed to run the test must
+                          be listed
+    """
+    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),
+                          hash_targets=hash_targets
+                              if self.allow_hashing else None,
+                          flake_retries=5 if 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.' % compiler)
+
+
+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._make_options = []
+      self._docker_distro = self._get_docker_distro(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:
+      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' % (binary, test),
+                                              cpu_cost=target['cpu_cost'],
+                                              environ={'GRPC_DEFAULT_SSL_ROOTS_FILE_PATH':
+                                                       _ROOT + '/src/core/tsi/test_creds/ca.pem'}))
+        else:
+          cmdline = [binary] + target['args']
+          out.append(self.config.job_spec(cmdline, [binary],
+                                          shortname=' '.join(cmdline),
+                                          cpu_cost=target['cpu_cost'],
+                                          environ={'GRPC_DEFAULT_SSL_ROOTS_FILE_PATH':
+                                                   _ROOT + '/src/core/tsi/test_creds/ca.pem'}))
+      elif self.args.regex == '.*' or self.platform == 'windows':
+        print '\nWARNING: binary not found, skipping', binary
+    return sorted(out)
+
+  def make_targets(self):
+    test_regex = self.args.regex
+    if self.platform != 'windows' and self.args.regex != '.*':
+      # use the regex to minimize the number of things to build
+      return [os.path.basename(target['name'])
+              for target in get_c_tests(False, self.test_lang)
+              if re.search(test_regex, '/' + target['name'])]
+    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 _get_docker_distro(self, use_docker, compiler):
+    if _is_use_docker_child():
+      return "already_under_docker"
+    if not use_docker:
+      _check_compiler(compiler, ['default'])
+
+    if compiler == 'gcc4.9' or compiler == 'default':
+      return 'jessie'
+    elif compiler == 'gcc4.4':
+      return 'squeeze'
+    elif compiler == 'gcc5.3':
+      return 'ubuntu1604'
+    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()
+    self.node_version = '0.12'
+
+  def configure(self, config, args):
+    self.config = config
+    self.args = args
+    _check_compiler(self.args.compiler, ['default'])
+
+  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 PythonLanguage(object):
+
+  def __init__(self):
+    self._build_python_versions = ['2.7']
+    self._has_python_versions = []
+
+  def configure(self, config, args):
+    self.config = config
+    self.args = args
+    _check_compiler(self.args.compiler, ['default'])
+
+  def test_specs(self):
+    # load list of known test suites
+    with open('src/python/grpcio/tests/tests.json') as tests_json_file:
+      tests_json = json.load(tests_json_file)
+    environment = dict(_FORCE_ENVIRON_FOR_WRAPPERS)
+    environment['PYVER'] = '2.7'
+    if self.config.build_config != 'gcov':
+      return [self.config.job_spec(
+          ['tools/run_tests/run_python.sh'],
+          None,
+          environ=dict(environment.items() +
+                       [('GRPC_PYTHON_TESTRUNNER_FILTER', suite_name)]),
+          shortname='py.test.%s' % suite_name,
+          timeout_seconds=5*60)
+          for suite_name in tests_json]
+    else:
+      return [self.config.job_spec(['tools/run_tests/run_python.sh'],
+                                   None,
+                                   environ=environment,
+                                   shortname='py.test.coverage',
+                                   timeout_seconds=15*60)]
+
+
+  def pre_build_steps(self):
+    return []
+
+  def make_targets(self):
+    return ['static_c', 'grpc_python_plugin', 'shared_c']
+
+  def make_options(self):
+    return []
+
+  def build_steps(self):
+    commands = []
+    for python_version in self._build_python_versions:
+      try:
+        with open(os.devnull, 'w') as output:
+          subprocess.check_call(['which', 'python' + python_version],
+                                stdout=output, stderr=output)
+        commands.append(['tools/run_tests/build_python.sh', python_version])
+        self._has_python_versions.append(python_version)
+      except:
+        jobset.message('WARNING', 'Missing Python ' + python_version,
+                       do_newline=True)
+    return commands
+
+  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 __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'], None,
+                                 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
+    _check_compiler(self.args.compiler, ['default'])
+
+  def test_specs(self):
+    with open('src/csharp/tests.json') as f:
+      tests_json = json.load(f)
+    assemblies = tests_json['assemblies']
+    tests = tests_json['tests']
+
+    msbuild_config = _MSBUILD_CONFIG[self.config.build_config]
+    assembly_files = ['%s/bin/%s/%s.dll' % (a, msbuild_config, a)
+                      for a in assemblies]
+
+    extra_args = ['-labels'] + assembly_files
+
+    if self.platform == 'windows':
+      script_name = 'tools\\run_tests\\run_csharp.bat'
+      extra_args += ['-domain=None']
+    else:
+      script_name = 'tools/run_tests/run_csharp.sh'
+
+    if self.config.build_config == 'gcov':
+      # On Windows, we only collect C# code coverage.
+      # On Linux, we only collect coverage for native extension.
+      # For code coverage all tests need to run as one suite.
+      return [self.config.job_spec([script_name] + extra_args, None,
+                                    shortname='csharp.coverage',
+                                    environ=_FORCE_ENVIRON_FOR_WRAPPERS)]
+    else:
+      specs = []
+      for test in tests:
+        cmdline = [script_name, '-run=%s' % test] + extra_args
+        if self.platform == 'windows':
+          # use different output directory for each test to prevent
+          # TestResult.xml clash between parallel test runs.
+          cmdline += ['-work=test-result/%s' % uuid.uuid4()]
+        specs.append(self.config.job_spec(cmdline, None,
+                                          shortname='csharp.%s' % test,
+                                          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):
+    # For Windows, this target doesn't really build anything,
+    # everything is build by buildall script later.
+    if self.platform == 'windows':
+      return []
+    else:
+      return ['grpc_csharp_ext']
+
+  def make_options(self):
+    if self.platform == 'mac':
+      # On Mac, official distribution of mono is 32bit.
+      return ['CFLAGS=-arch i386', 'LDFLAGS=-arch i386']
+    else:
+      return []
+
+  def build_steps(self):
+    if self.platform == 'windows':
+      return [['src\\csharp\\buildall.bat']]
+    else:
+      return [['tools/run_tests/build_csharp.sh']]
+
+  def post_tests_steps(self):
+    return []
+
+  def makefile_name(self):
+    return 'Makefile'
+
+  def dockerfile_dir(self):
+    return 'tools/dockerfile/test/csharp_jessie_%s' % _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'], None,
+                                  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(), None,
+                                   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."""
+  if compiler == 'default' or compiler == 'vs2013':
+    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."""
+  if compiler == 'default' or compiler == 'vs2013':
+    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('-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', 'gcc4.9', 'gcc5.3',
+                           'vs2010', 'vs2013', 'vs2015'],
+                  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')
+args = argp.parse_args()
+
+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 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:
+    print 'Languages to be tested require running under different docker images.'
+    sys.exit(1)
+  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
+  env['DOCKER_RUN_SCRIPT'] = 'tools/jenkins/docker_run_tests.sh'
+  if args.xml_report:
+    env['XML_REPORT'] = args.xml_report
+  if not args.travis:
+    env['TTY_FLAG'] = '-t'  # enables Ctrl-C when not on Jenkins.
+
+  subprocess.check_call(['tools/jenkins/build_docker_and_run_tests.sh'],
+                        shell=True,
+                        env=env)
+  sys.exit(0)
+
+_check_arch_option(args.arch)
+
+def make_jobspec(cfg, targets, makefile='Makefile'):
+  if platform_string() == 'windows':
+    extra_args = []
+    # better do parallel compilation
+    # empirically /m:2 gives the best performance/price and should prevent
+    # overloading the windows workers.
+    extra_args.extend(['/m:2'])
+    # disable PDB generation: it's broken, and we don't need it during CI
+    extra_args.extend(['/p:Jenkins=true'])
+    return [
+      jobset.JobSpec([_windows_build_bat(args.compiler),
+                      'vsprojects\\%s.sln' % target,
+                      '/p:Configuration=%s' % _MSBUILD_CONFIG[cfg]] +
+                      extra_args +
+                      language_make_options,
+                      shell=True, timeout_seconds=None)
+      for target in targets]
+  else:
+    if targets:
+      return [jobset.JobSpec([os.getenv('MAKE', 'make'),
+                              '-f', makefile,
+                              '-j', '%d' % args.jobs,
+                              'EXTRA_DEFINES=GRPC_TEST_SLOWDOWN_MACHINE_FACTOR=%f' % args.slowdown,
+                              'CONFIG=%s' % cfg] +
+                              language_make_options +
+                             ([] if not args.travis else ['JENKINS_BUILD=1']) +
+                             targets,
+                             timeout_seconds=None)]
+    else:
+      return []
+
+make_targets = {}
+for l in languages:
+  makefile = l.makefile_name()
+  make_targets[makefile] = make_targets.get(makefile, set()).union(
+      set(l.make_targets()))
+
+def build_step_environ(cfg):
+  environ = {'CONFIG': cfg}
+  msbuild_cfg = _MSBUILD_CONFIG.get(cfg)
+  if msbuild_cfg:
+    environ['MSBUILD_CONFIG'] = msbuild_cfg
+  return environ
+
+build_steps = list(set(
+                   jobset.JobSpec(cmdline, environ=build_step_environ(build_config), flake_retries=5)
+                   for l in languages
+                   for cmdline in l.pre_build_steps()))
+if make_targets:
+  make_commands = itertools.chain.from_iterable(make_jobspec(build_config, list(targets), makefile) for (makefile, targets) in make_targets.iteritems())
+  build_steps.extend(set(make_commands))
+build_steps.extend(set(
+                   jobset.JobSpec(cmdline, environ=build_step_environ(build_config), timeout_seconds=None)
+                   for l in languages
+                   for cmdline in l.build_steps()))
+
+post_tests_steps = list(set(
+                        jobset.JobSpec(cmdline, environ=build_step_environ(build_config))
+                        for l in languages
+                        for cmdline in l.post_tests_steps()))
+runs_per_test = args.runs_per_test
+forever = args.forever
+
+
+class TestCache(object):
+  """Cache for running tests."""
+
+  def __init__(self, use_cache_results):
+    self._last_successful_run = {}
+    self._use_cache_results = use_cache_results
+    self._last_save = time.time()
+
+  def should_run(self, cmdline, bin_hash):
+    if cmdline not in self._last_successful_run:
+      return True
+    if self._last_successful_run[cmdline] != bin_hash:
+      return True
+    if not self._use_cache_results:
+      return True
+    return False
+
+  def finished(self, cmdline, bin_hash):
+    self._last_successful_run[cmdline] = bin_hash
+    if time.time() - self._last_save > 1:
+      self.save()
+
+  def dump(self):
+    return [{'cmdline': k, 'hash': v}
+            for k, v in self._last_successful_run.iteritems()]
+
+  def parse(self, exdump):
+    self._last_successful_run = dict((o['cmdline'], o['hash']) for o in exdump)
+
+  def save(self):
+    with open('.run_tests_cache', 'w') as f:
+      f.write(json.dumps(self.dump()))
+    self._last_save = time.time()
+
+  def maybe_load(self):
+    if os.path.exists('.run_tests_cache'):
+      with open('.run_tests_cache') as f:
+        self.parse(json.loads(f.read()))
+
+
+def _start_port_server(port_server_port):
+  # check if a compatible port server is running
+  # if incompatible (version mismatch) ==> start a new one
+  # if not running ==> start a new one
+  # otherwise, leave it up
+  try:
+    version = int(urllib2.urlopen(
+        'http://localhost:%d/version_number' % port_server_port,
+        timeout=1).read())
+    print 'detected port server running version %d' % version
+    running = True
+  except Exception as e:
+    print 'failed to detect port server: %s' % sys.exc_info()[0]
+    print e.strerror
+    running = False
+  if running:
+    current_version = int(subprocess.check_output(
+        [sys.executable, os.path.abspath('tools/run_tests/port_server.py'),
+         'dump_version']))
+    print 'my port server is version %d' % current_version
+    running = (version >= current_version)
+    if not running:
+      print 'port_server version mismatch: killing the old one'
+      urllib2.urlopen('http://localhost:%d/quitquitquit' % port_server_port).read()
+      time.sleep(1)
+  if not running:
+    fd, logfile = tempfile.mkstemp()
+    os.close(fd)
+    print 'starting port_server, with log file %s' % logfile
+    args = [sys.executable, os.path.abspath('tools/run_tests/port_server.py'),
+            '-p', '%d' % port_server_port, '-l', logfile]
+    env = dict(os.environ)
+    env['BUILD_ID'] = 'pleaseDontKillMeJenkins'
+    if platform_string() == 'windows':
+      # Working directory of port server needs to be outside of Jenkins
+      # workspace to prevent file lock issues.
+      tempdir = tempfile.mkdtemp()
+      port_server = subprocess.Popen(
+          args,
+          env=env,
+          cwd=tempdir,
+          creationflags = 0x00000008, # detached process
+          close_fds=True)
+    else:
+      port_server = subprocess.Popen(
+          args,
+          env=env,
+          preexec_fn=os.setsid,
+          close_fds=True)
+    time.sleep(1)
+    # ensure port server is up
+    waits = 0
+    while True:
+      if waits > 10:
+        print 'killing port server due to excessive start up waits'
+        port_server.kill()
+      if port_server.poll() is not None:
+        print 'port_server failed to start'
+        # try one final time: maybe another build managed to start one
+        time.sleep(1)
+        try:
+          urllib2.urlopen('http://localhost:%d/get' % port_server_port,
+                          timeout=1).read()
+          print 'last ditch attempt to contact port server succeeded'
+          break
+        except:
+          traceback.print_exc()
+          port_log = open(logfile, 'r').read()
+          print port_log
+          sys.exit(1)
+      try:
+        urllib2.urlopen('http://localhost:%d/get' % port_server_port,
+                        timeout=1).read()
+        print 'port server is up and ready'
+        break
+      except socket.timeout:
+        print 'waiting for port_server: timeout'
+        traceback.print_exc();
+        time.sleep(1)
+        waits += 1
+      except urllib2.URLError:
+        print 'waiting for port_server: urlerror'
+        traceback.print_exc();
+        time.sleep(1)
+        waits += 1
+      except:
+        traceback.print_exc()
+        port_server.kill()
+        raise
+
+
+def _calculate_num_runs_failures(list_of_results):
+  """Caculate number of runs and failures for a particular test.
+
+  Args:
+    list_of_results: (List) of JobResult object.
+  Returns:
+    A tuple of total number of runs and failures.
+  """
+  num_runs = len(list_of_results)  # By default, there is 1 run per JobResult.
+  num_failures = 0
+  for jobresult in list_of_results:
+    if jobresult.retries > 0:
+      num_runs += jobresult.retries
+    if jobresult.num_failures > 0:
+      num_failures += jobresult.num_failures
+  return num_runs, num_failures
+
+
+# _build_and_run results
+class BuildAndRunError(object):
+
+  BUILD = object()
+  TEST = object()
+  POST_TEST = object()
+
+
+# returns a list of things that failed (or an empty list on success)
+def _build_and_run(
+    check_cancelled, newline_on_success, cache, xml_report=None, build_only=False):
+  """Do one pass of building & running tests."""
+  # build latest sequentially
+  num_failures, resultset = jobset.run(
+      build_steps, maxjobs=1, stop_on_failure=True,
+      newline_on_success=newline_on_success, travis=args.travis)
+  if num_failures:
+    return [BuildAndRunError.BUILD]
+
+  if build_only:
+    if xml_report:
+      report_utils.render_junit_xml_report(resultset, xml_report)
+    return []
+
+  # start antagonists
+  antagonists = [subprocess.Popen(['tools/run_tests/antagonist.py'])
+                 for _ in range(0, args.antagonists)]
+  port_server_port = 32767
+  _start_port_server(port_server_port)
+  resultset = None
+  num_test_failures = 0
+  try:
+    infinite_runs = runs_per_test == 0
+    one_run = set(
+      spec
+      for language in languages
+      for spec in language.test_specs()
+      if re.search(args.regex, spec.shortname))
+    # When running on travis, we want out test runs to be as similar as possible
+    # for reproducibility purposes.
+    if args.travis:
+      massaged_one_run = sorted(one_run, key=lambda x: x.shortname)
+    else:
+      # whereas otherwise, we want to shuffle things up to give all tests a
+      # chance to run.
+      massaged_one_run = list(one_run)  # random.shuffle needs an indexable seq.
+      random.shuffle(massaged_one_run)  # which it modifies in-place.
+    if infinite_runs:
+      assert len(massaged_one_run) > 0, 'Must have at least one test for a -n inf run'
+    runs_sequence = (itertools.repeat(massaged_one_run) if infinite_runs
+                     else itertools.repeat(massaged_one_run, runs_per_test))
+    all_runs = itertools.chain.from_iterable(runs_sequence)
+
+    num_test_failures, resultset = jobset.run(
+        all_runs, check_cancelled, newline_on_success=newline_on_success,
+        travis=args.travis, infinite_runs=infinite_runs, maxjobs=args.jobs,
+        stop_on_failure=args.stop_on_failure,
+        cache=cache if not xml_report else None,
+        add_env={'GRPC_TEST_PORT_SERVER': 'localhost:%d' % port_server_port})
+    if resultset:
+      for k, v in resultset.iteritems():
+        num_runs, num_failures = _calculate_num_runs_failures(v)
+        if num_failures == num_runs:  # what about infinite_runs???
+          jobset.message('FAILED', k, do_newline=True)
+        elif num_failures > 0:
+          jobset.message(
+              'FLAKE', '%s [%d/%d runs flaked]' % (k, num_failures, num_runs),
+              do_newline=True)
+        else:
+          jobset.message('PASSED', k, do_newline=True)
+  finally:
+    for antagonist in antagonists:
+      antagonist.kill()
+    if xml_report and resultset:
+      report_utils.render_junit_xml_report(resultset, xml_report)
+
+  number_failures, _ = jobset.run(
+      post_tests_steps, maxjobs=1, stop_on_failure=True,
+      newline_on_success=newline_on_success, travis=args.travis)
+
+  out = []
+  if number_failures:
+    out.append(BuildAndRunError.POST_TEST)
+  if num_test_failures:
+    out.append(BuildAndRunError.TEST)
+
+  if cache: cache.save()
+
+  return out
+
+
+test_cache = TestCache(runs_per_test == 1)
+test_cache.maybe_load()
+
+if forever:
+  success = True
+  while True:
+    dw = watch_dirs.DirWatcher(['src', 'include', 'test', 'examples'])
+    initial_time = dw.most_recent_change()
+    have_files_changed = lambda: dw.most_recent_change() != initial_time
+    previous_success = success
+    errors = _build_and_run(check_cancelled=have_files_changed,
+                            newline_on_success=False,
+                            cache=test_cache,
+                            build_only=args.build_only) == 0
+    if not previous_success and not errors:
+      jobset.message('SUCCESS',
+                     'All tests are now passing properly',
+                     do_newline=True)
+    jobset.message('IDLE', 'No change detected')
+    while not have_files_changed():
+      time.sleep(1)
+else:
+  errors = _build_and_run(check_cancelled=lambda: False,
+                          newline_on_success=args.newline_on_success,
+                          cache=test_cache,
+                          xml_report=args.xml_report,
+                          build_only=args.build_only)
+  if not errors:
+    jobset.message('SUCCESS', 'All tests passed', do_newline=True)
+  else:
+    jobset.message('FAILED', 'Some tests failed', do_newline=True)
+  exit_code = 0
+  if BuildAndRunError.BUILD in errors:
+    exit_code |= 1
+  if BuildAndRunError.TEST in errors and not args.travis:
+    exit_code |= 2
+  if BuildAndRunError.POST_TEST in errors:
+    exit_code |= 4
+  sys.exit(exit_code)