tools/run_tests/run_interop_tests.py

#!/usr/bin/env python2.7
# Copyright 2015, Google Inc.
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# modification, are permitted provided that the following conditions are
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"""Run interop (cross-language) tests in parallel."""

import argparse
import atexit
import dockerjob
import itertools
import jobset
import json
import multiprocessing
import os
import re
import report_utils
import subprocess
import sys
import tempfile
import time
import uuid

# Docker doesn't clean up after itself, so we do it on exit.
atexit.register(lambda: subprocess.call(['stty', 'echo']))

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

_DEFAULT_SERVER_PORT=8080

_SKIP_COMPRESSION = ['large_compressed_unary',
                     'server_compressed_streaming']

_SKIP_ADVANCED = ['custom_metadata', 'status_code_and_message',
                  'unimplemented_method']

_TEST_TIMEOUT = 3*60

class CXXLanguage:

  def __init__(self):
    self.client_cwd = None
    self.server_cwd = None
    self.safename = 'cxx'

  def client_cmd(self, args):
    return ['bins/opt/interop_client'] + args

  def cloud_to_prod_env(self):
    return {}

  def server_cmd(self, args):
    return ['bins/opt/interop_server', '--use_tls=true'] + args

  def global_env(self):
    return {}

  def unimplemented_test_cases(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION

  def unimplemented_test_cases_server(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION

  def __str__(self):
    return 'c++'


class CSharpLanguage:

  def __init__(self):
    self.client_cwd = 'src/csharp/Grpc.IntegrationTesting.Client/bin/Debug'
    self.server_cwd = 'src/csharp/Grpc.IntegrationTesting.Server/bin/Debug'
    self.safename = str(self)

  def client_cmd(self, args):
    return ['mono', 'Grpc.IntegrationTesting.Client.exe'] + args

  def cloud_to_prod_env(self):
    return {}

  def server_cmd(self, args):
    return ['mono', 'Grpc.IntegrationTesting.Server.exe', '--use_tls=true'] + args

  def global_env(self):
    return {}

  def unimplemented_test_cases(self):
    return _SKIP_COMPRESSION

  def unimplemented_test_cases_server(self):
    return _SKIP_COMPRESSION

  def __str__(self):
    return 'csharp'


class JavaLanguage:

  def __init__(self):
    self.client_cwd = '../grpc-java'
    self.server_cwd = '../grpc-java'
    self.safename = str(self)

  def client_cmd(self, args):
    return ['./run-test-client.sh'] + args

  def cloud_to_prod_env(self):
    return {}

  def server_cmd(self, args):
    return ['./run-test-server.sh', '--use_tls=true'] + args

  def global_env(self):
    return {}

  def unimplemented_test_cases(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION

  def unimplemented_test_cases_server(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION

  def __str__(self):
    return 'java'


class GoLanguage:

  def __init__(self):
    # TODO: this relies on running inside docker
    self.client_cwd = '/go/src/google.golang.org/grpc/interop/client'
    self.server_cwd = '/go/src/google.golang.org/grpc/interop/server'
    self.safename = str(self)

  def client_cmd(self, args):
    return ['go', 'run', 'client.go'] + args

  def cloud_to_prod_env(self):
    return {}

  def server_cmd(self, args):
    return ['go', 'run', 'server.go', '--use_tls=true'] + args

  def global_env(self):
    return {}

  def unimplemented_test_cases(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION

  def unimplemented_test_cases_server(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION

  def __str__(self):
    return 'go'


class Http2Client:
  """Represents the HTTP/2 Interop Test

  This pretends to be a language in order to be built and run, but really it
  isn't.
  """
  def __init__(self):
    self.client_cwd = None
    self.safename = str(self)

  def client_cmd(self, args):
    return ['tools/http2_interop/http2_interop.test', '-test.v'] + args

  def cloud_to_prod_env(self):
    return {}

  def global_env(self):
    return {}

  def unimplemented_test_cases(self):
    return _TEST_CASES

  def unimplemented_test_cases_server(self):
    return []

  def __str__(self):
    return 'http2'

class NodeLanguage:

  def __init__(self):
    self.client_cwd = None
    self.server_cwd = None
    self.safename = str(self)

  def client_cmd(self, args):
    return ['node', 'src/node/interop/interop_client.js'] + args

  def cloud_to_prod_env(self):
    return {}

  def server_cmd(self, args):
    return ['node', 'src/node/interop/interop_server.js', '--use_tls=true'] + args

  def global_env(self):
    return {}

  def unimplemented_test_cases(self):
    return _SKIP_COMPRESSION

  def unimplemented_test_cases_server(self):
    return _SKIP_COMPRESSION

  def __str__(self):
    return 'node'


class PHPLanguage:

  def __init__(self):
    self.client_cwd = None
    self.safename = str(self)

  def client_cmd(self, args):
    return ['src/php/bin/interop_client.sh'] + args

  def cloud_to_prod_env(self):
    return {}

  def global_env(self):
    return {}

  def unimplemented_test_cases(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION

  def unimplemented_test_cases_server(self):
    return []

  def __str__(self):
    return 'php'


class RubyLanguage:

  def __init__(self):
    self.client_cwd = None
    self.server_cwd = None
    self.safename = str(self)

  def client_cmd(self, args):
    return ['ruby', 'src/ruby/pb/test/client.rb'] + args

  def cloud_to_prod_env(self):
    return {}

  def server_cmd(self, args):
    return ['ruby', 'src/ruby/pb/test/server.rb', '--use_tls=true'] + args

  def global_env(self):
    return {}

  def unimplemented_test_cases(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION

  def unimplemented_test_cases_server(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION

  def __str__(self):
    return 'ruby'


class PythonLanguage:

  def __init__(self):
    self.client_cwd = None
    self.server_cwd = None
    self.safename = str(self)

  def client_cmd(self, args):
    return [
        'tox -einterop_client --',
        ' '.join(args)
    ]

  def cloud_to_prod_env(self):
    return {}

  def server_cmd(self, args):
    return [
        'tox -einterop_server --',
        ' '.join(args) + ' --use_tls=true'
    ]

  def global_env(self):
    return {'LD_LIBRARY_PATH': '{}/libs/opt'.format(DOCKER_WORKDIR_ROOT),
            'PYTHONPATH': '{}/src/python/gens'.format(DOCKER_WORKDIR_ROOT)}

  def unimplemented_test_cases(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION + ['jwt_token_creds',
                                                 'per_rpc_creds']

  def unimplemented_test_cases_server(self):
    return _SKIP_ADVANCED + _SKIP_COMPRESSION

  def __str__(self):
    return 'python'


_LANGUAGES = {
    'c++' : CXXLanguage(),
    'csharp' : CSharpLanguage(),
    'go' : GoLanguage(),
    'java' : JavaLanguage(),
    'node' : NodeLanguage(),
    'php' :  PHPLanguage(),
    'ruby' : RubyLanguage(),
    'python' : PythonLanguage(),
}

# languages supported as cloud_to_cloud servers
_SERVERS = ['c++', 'node', 'csharp', 'java', 'go', 'ruby', 'python']

_TEST_CASES = ['large_unary', 'empty_unary', 'ping_pong',
               'empty_stream', 'client_streaming', 'server_streaming',
               'cancel_after_begin', 'cancel_after_first_response',
               'timeout_on_sleeping_server', 'custom_metadata',
               'status_code_and_message', 'unimplemented_method',
               'large_compressed_unary', 'server_compressed_streaming']

_AUTH_TEST_CASES = ['compute_engine_creds', 'jwt_token_creds',
                    'oauth2_auth_token', 'per_rpc_creds']

_HTTP2_TEST_CASES = ["tls", "framing"]

DOCKER_WORKDIR_ROOT = '/var/local/git/grpc'

def docker_run_cmdline(cmdline, image, docker_args=[], cwd=None, environ=None):
  """Wraps given cmdline array to create 'docker run' cmdline from it."""
  docker_cmdline = ['docker', 'run', '-i', '--rm=true']

  # turn environ into -e docker args
  if environ:
    for k,v in environ.iteritems():
      docker_cmdline += ['-e', '%s=%s' % (k,v)]

  # set working directory
  workdir = DOCKER_WORKDIR_ROOT
  if cwd:
    workdir = os.path.join(workdir, cwd)
  docker_cmdline += ['-w', workdir]

  docker_cmdline += docker_args + [image] + cmdline
  return docker_cmdline


def bash_login_cmdline(cmdline):
  """Creates bash -l -c cmdline from args list."""
  # Use login shell:
  # * rvm and nvm require it
  # * makes error messages clearer if executables are missing
  return ['bash', '-l', '-c', ' '.join(cmdline)]


def auth_options(language, test_case):
  """Returns (cmdline, env) tuple with cloud_to_prod_auth test options."""

  language = str(language)
  cmdargs = []
  env = {}

  # TODO(jtattermusch): this file path only works inside docker
  key_filepath = '/root/service_account/stubbyCloudTestingTest-ee3fce360ac5.json'
  oauth_scope_arg = '--oauth_scope=https://www.googleapis.com/auth/xapi.zoo'
  key_file_arg = '--service_account_key_file=%s' % key_filepath
  default_account_arg = '--default_service_account=830293263384-compute@developer.gserviceaccount.com'

  if test_case in ['jwt_token_creds', 'per_rpc_creds', 'oauth2_auth_token']:
    if language in ['csharp', 'node', 'php', 'python', 'ruby']:
      env['GOOGLE_APPLICATION_CREDENTIALS'] = key_filepath
    else:
      cmdargs += [key_file_arg]

  if test_case in ['per_rpc_creds', 'oauth2_auth_token']:
    cmdargs += [oauth_scope_arg]

  if test_case == 'oauth2_auth_token' and language == 'c++':
    # C++ oauth2 test uses GCE creds and thus needs to know the default account
    cmdargs += [default_account_arg]

  if test_case == 'compute_engine_creds':
    cmdargs += [oauth_scope_arg, default_account_arg]

  return (cmdargs, env)


def _job_kill_handler(job):
  if job._spec.container_name:
    dockerjob.docker_kill(job._spec.container_name)
    # When the job times out and we decide to kill it,
    # we need to wait a before restarting the job
    # to prevent "container name already in use" error.
    # TODO(jtattermusch): figure out a cleaner way to to this.
    time.sleep(2)


def cloud_to_prod_jobspec(language, test_case, server_host_name,
                          server_host_detail, docker_image=None, auth=False):
  """Creates jobspec for cloud-to-prod interop test"""
  container_name = None
  cmdargs = [
      '--server_host=%s' % server_host_detail[0],
      '--server_host_override=%s' % server_host_detail[1],
      '--server_port=443',
      '--use_tls=true',
      '--test_case=%s' % test_case]
  environ = dict(language.cloud_to_prod_env(), **language.global_env())
  if auth:
    auth_cmdargs, auth_env = auth_options(language, test_case)
    cmdargs += auth_cmdargs
    environ.update(auth_env)
  cmdline = bash_login_cmdline(language.client_cmd(cmdargs))
  cwd = language.client_cwd

  if docker_image:
    container_name = dockerjob.random_name('interop_client_%s' %
                                           language.safename)
    cmdline = docker_run_cmdline(cmdline,
                                 image=docker_image,
                                 cwd=cwd,
                                 environ=environ,
                                 docker_args=['--net=host',
                                              '--name', container_name])
    cwd = None
    environ = None

  suite_name='cloud_to_prod_auth' if auth else 'cloud_to_prod'
  test_job = jobset.JobSpec(
          cmdline=cmdline,
          cwd=cwd,
          environ=environ,
          shortname='%s:%s:%s:%s' % (suite_name, server_host_name, language,
                                     test_case),
          timeout_seconds=_TEST_TIMEOUT,
          flake_retries=5 if args.allow_flakes else 0,
          timeout_retries=2 if args.allow_flakes else 0,
          kill_handler=_job_kill_handler)
  test_job.container_name = container_name
  return test_job


def cloud_to_cloud_jobspec(language, test_case, server_name, server_host,
                           server_port, docker_image=None):
  """Creates jobspec for cloud-to-cloud interop test"""
  cmdline = bash_login_cmdline(language.client_cmd([
      '--server_host_override=foo.test.google.fr',
      '--use_tls=true',
      '--use_test_ca=true',
      '--test_case=%s' % test_case,
      '--server_host=%s' % server_host,
      '--server_port=%s' % server_port]))
  cwd = language.client_cwd
  environ = language.global_env()
  if docker_image:
    container_name = dockerjob.random_name('interop_client_%s' % language.safename)
    cmdline = docker_run_cmdline(cmdline,
                                 image=docker_image,
                                 environ=environ,
                                 cwd=cwd,
                                 docker_args=['--net=host',
                                              '--name', container_name])
    cwd = None

  test_job = jobset.JobSpec(
          cmdline=cmdline,
          cwd=cwd,
          environ=environ,
          shortname='cloud_to_cloud:%s:%s_server:%s' % (language, server_name,
                                                        test_case),
          timeout_seconds=_TEST_TIMEOUT,
          flake_retries=5 if args.allow_flakes else 0,
          timeout_retries=2 if args.allow_flakes else 0,
          kill_handler=_job_kill_handler)
  test_job.container_name = container_name
  return test_job


def server_jobspec(language, docker_image):
  """Create jobspec for running a server"""
  container_name = dockerjob.random_name('interop_server_%s' % language.safename)
  cmdline = bash_login_cmdline(
      language.server_cmd(['--port=%s' % _DEFAULT_SERVER_PORT]))
  environ = language.global_env()
  docker_cmdline = docker_run_cmdline(cmdline,
                                      image=docker_image,
                                      cwd=language.server_cwd,
                                      environ=environ,
                                      docker_args=['-p', str(_DEFAULT_SERVER_PORT),
                                                   '--name', container_name])

  server_job = jobset.JobSpec(
          cmdline=docker_cmdline,
          environ=environ,
          shortname='interop_server_%s' % language,
          timeout_seconds=30*60)
  server_job.container_name = container_name
  return server_job


def build_interop_image_jobspec(language, tag=None):
  """Creates jobspec for building interop docker image for a language"""
  if not tag:
    tag = 'grpc_interop_%s:%s' % (language.safename, uuid.uuid4())
  env = {'INTEROP_IMAGE': tag,
         'BASE_NAME': 'grpc_interop_%s' % language.safename}
  if not args.travis:
    env['TTY_FLAG'] = '-t'
  # This env variable is used to get around the github rate limit
  # error when running the PHP `composer install` command
  host_file = '%s/.composer/auth.json' % os.environ['HOME']
  if language.safename == 'php' and os.path.exists(host_file):
    env['BUILD_INTEROP_DOCKER_EXTRA_ARGS'] = \
      '-v %s:/root/.composer/auth.json:ro' % host_file
  build_job = jobset.JobSpec(
          cmdline=['tools/run_tests/dockerize/build_interop_image.sh'],
          environ=env,
          shortname='build_docker_%s' % (language),
          timeout_seconds=30*60)
  build_job.tag = tag
  return build_job


def aggregate_http2_results(stdout):
  match = re.search(r'\{"cases[^\]]*\]\}', stdout)
  if not match:
    return None

  results = json.loads(match.group(0))
  skipped = 0
  passed = 0
  failed = 0
  failed_cases = []
  for case in results['cases']:
    if case.get('skipped', False):
      skipped += 1
    else:
      if case.get('passed', False):
        passed += 1
      else:
        failed += 1
        failed_cases.append(case.get('name', "NONAME"))
  return {
    'passed': passed,
    'failed': failed,
    'skipped': skipped,
    'failed_cases': ', '.join(failed_cases),
    'percent': 1.0 * passed / (passed + failed)
  }

# A dictionary of prod servers to test.
# Format: server_name: (server_host, server_host_override, errors_allowed)
# TODO(adelez): implement logic for errors_allowed where if the indicated tests
# fail, they don't impact the overall test result.
prod_servers = {
    'default': ('grpc-test.sandbox.googleapis.com',
                'grpc-test.sandbox.googleapis.com', False),
    'gateway_v2': ('grpc-test2.sandbox.googleapis.com',
                   'grpc-test2.sandbox.googleapis.com', True),
    'cloud_gateway': ('216.239.32.255', 'grpc-test.sandbox.googleapis.com',
                      False),
    'cloud_gateway_v2': ('216.239.32.255', 'grpc-test2.sandbox.googleapis.com',
                         True),
    'gateway_v4': ('grpc-test4.sandbox.googleapis.com',
                   'grpc-test4.sandbox.googleapis.com', True),
    'cloud_gateway_v4': ('216.239.32.255', 'grpc-test4.sandbox.googleapis.com',
                         True),
}

argp = argparse.ArgumentParser(description='Run interop tests.')
argp.add_argument('-l', '--language',
                  choices=['all'] + sorted(_LANGUAGES),
                  nargs='+',
                  default=['all'],
                  help='Clients to run.')
argp.add_argument('-j', '--jobs', default=multiprocessing.cpu_count(), type=int)
argp.add_argument('--cloud_to_prod',
                  default=False,
                  action='store_const',
                  const=True,
                  help='Run cloud_to_prod tests.')
argp.add_argument('--cloud_to_prod_auth',
                  default=False,
                  action='store_const',
                  const=True,
                  help='Run cloud_to_prod_auth tests.')
argp.add_argument('--prod_servers',
                  choices=prod_servers.keys(),
                  default=['default'],
                  nargs='+',
                  help=('The servers to run cloud_to_prod and '
                        'cloud_to_prod_auth tests against.'))
argp.add_argument('-s', '--server',
                  choices=['all'] + sorted(_SERVERS),
                  action='append',
                  help='Run cloud_to_cloud servers in a separate docker ' +
                       'image. Servers can only be started automatically if ' +
                       '--use_docker option is enabled.',
                  default=[])
argp.add_argument('--override_server',
                  action='append',
                  type=lambda kv: kv.split('='),
                  help='Use servername=HOST:PORT to explicitly specify a server. E.g. csharp=localhost:50000',
                  default=[])
argp.add_argument('-t', '--travis',
                  default=False,
                  action='store_const',
                  const=True)
argp.add_argument('--use_docker',
                  default=False,
                  action='store_const',
                  const=True,
                  help='Run all the interop 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('--http2_interop',
                  default=False,
                  action='store_const',
                  const=True,
                  help='Enable HTTP/2 interop tests')

args = argp.parse_args()

servers = set(s for s in itertools.chain.from_iterable(_SERVERS
                                                       if x == 'all' else [x]
                                                       for x in args.server))

if args.use_docker:
  if not args.travis:
    print 'Seen --use_docker flag, will run interop 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)

if not args.use_docker and servers:
  print 'Running interop servers is only supported with --use_docker option enabled.'
  sys.exit(1)

languages = set(_LANGUAGES[l]
                for l in itertools.chain.from_iterable(
                      _LANGUAGES.iterkeys() if x == 'all' else [x]
                      for x in args.language))

http2Interop = Http2Client() if args.http2_interop else None

docker_images={}
if args.use_docker:
  # languages for which to build docker images
  languages_to_build = set(_LANGUAGES[k] for k in set([str(l) for l in languages] +
                                                    [s for s in servers]))
  if args.http2_interop:
    languages_to_build.add(http2Interop)

  build_jobs = []
  for l in languages_to_build:
    job = build_interop_image_jobspec(l)
    docker_images[str(l)] = job.tag
    build_jobs.append(job)

  if build_jobs:
    jobset.message('START', 'Building interop docker images.', do_newline=True)
    num_failures, _ = jobset.run(
        build_jobs, newline_on_success=True, maxjobs=args.jobs)
    if num_failures == 0:
      jobset.message('SUCCESS', 'All docker images built successfully.',
                     do_newline=True)
    else:
      jobset.message('FAILED', 'Failed to build interop docker images.',
                     do_newline=True)
      for image in docker_images.itervalues():
        dockerjob.remove_image(image, skip_nonexistent=True)
      sys.exit(1)

# Start interop servers.
server_jobs={}
server_addresses={}
try:
  for s in servers:
    lang = str(s)
    spec = server_jobspec(_LANGUAGES[lang], docker_images.get(lang))
    job = dockerjob.DockerJob(spec)
    server_jobs[lang] = job
    server_addresses[lang] = ('localhost', job.mapped_port(_DEFAULT_SERVER_PORT))

  jobs = []
  if args.cloud_to_prod:
    for server_host_name in args.prod_servers:
      for language in languages:
        for test_case in _TEST_CASES:
          if not test_case in language.unimplemented_test_cases():
            if not test_case in _SKIP_ADVANCED + _SKIP_COMPRESSION:
              test_job = cloud_to_prod_jobspec(
                  language, test_case, server_host_name,
                  prod_servers[server_host_name],
                  docker_image=docker_images.get(str(language)))
              jobs.append(test_job)

      if args.http2_interop:
        for test_case in _HTTP2_TEST_CASES:
          test_job = cloud_to_prod_jobspec(
              http2Interop, test_case, server_host_name,
              prod_servers[server_host_name],
              docker_image=docker_images.get(str(http2Interop)))
          jobs.append(test_job)

  if args.cloud_to_prod_auth:
    for server_host_name in args.prod_servers:
      for language in languages:
        for test_case in _AUTH_TEST_CASES:
          if not test_case in language.unimplemented_test_cases():
            test_job = cloud_to_prod_jobspec(
                language, test_case, server_host_name,
                prod_servers[server_host_name],
                docker_image=docker_images.get(str(language)), auth=True)
            jobs.append(test_job)

  for server in args.override_server:
    server_name = server[0]
    (server_host, server_port) = server[1].split(':')
    server_addresses[server_name] = (server_host, server_port)

  for server_name, server_address in server_addresses.iteritems():
    (server_host, server_port) = server_address
    server_language = _LANGUAGES.get(server_name, None)
    skip_server = []  # test cases unimplemented by server
    if server_language:
      skip_server = server_language.unimplemented_test_cases_server()
    for language in languages:
      for test_case in _TEST_CASES:
        if not test_case in language.unimplemented_test_cases():
          if not test_case in skip_server:
            test_job = cloud_to_cloud_jobspec(language,
                                              test_case,
                                              server_name,
                                              server_host,
                                              server_port,
                                              docker_image=docker_images.get(str(language)))
            jobs.append(test_job)

    if args.http2_interop:
      for test_case in _HTTP2_TEST_CASES:
        if server_name == "go":
          # TODO(carl-mastrangelo): Reenable after https://github.com/grpc/grpc-go/issues/434
          continue
        test_job = cloud_to_cloud_jobspec(http2Interop,
                                          test_case,
                                          server_name,
                                          server_host,
                                          server_port,
                                          docker_image=docker_images.get(str(http2Interop)))
        jobs.append(test_job)

  if not jobs:
    print 'No jobs to run.'
    for image in docker_images.itervalues():
      dockerjob.remove_image(image, skip_nonexistent=True)
    sys.exit(1)

  num_failures, resultset = jobset.run(jobs, newline_on_success=True,
                                       maxjobs=args.jobs)
  if num_failures:
    jobset.message('FAILED', 'Some tests failed', do_newline=True)
  else:
    jobset.message('SUCCESS', 'All tests passed', do_newline=True)

  report_utils.render_junit_xml_report(resultset, 'report.xml')

  for name, job in resultset.iteritems():
    if "http2" in name:
      job[0].http2results = aggregate_http2_results(job[0].message)

  report_utils.render_interop_html_report(
      set([str(l) for l in languages]), servers, _TEST_CASES, _AUTH_TEST_CASES,
      _HTTP2_TEST_CASES, resultset, num_failures,
      args.cloud_to_prod_auth or args.cloud_to_prod, args.prod_servers,
      args.http2_interop)

finally:
  # Check if servers are still running.
  for server, job in server_jobs.iteritems():
    if not job.is_running():
      print 'Server "%s" has exited prematurely.' % server

  dockerjob.finish_jobs([j for j in server_jobs.itervalues()])

  for image in docker_images.itervalues():
    print 'Removing docker image %s' % image
    dockerjob.remove_image(image)