swarming.py

#!/usr/bin/env python
# Copyright 2013 The Swarming Authors. All rights reserved.
# Use of this source code is governed under the Apache License, Version 2.0 that
# can be found in the LICENSE file.

"""Client tool to trigger tasks or retrieve results from a Swarming server."""

__version__ = '0.4.5'

import datetime
import getpass
import hashlib
import json
import logging
import os
import shutil
import subprocess
import sys
import threading
import time
import urllib

from third_party import colorama
from third_party.depot_tools import fix_encoding
from third_party.depot_tools import subcommand

from utils import file_path
from third_party.chromium import natsort
from utils import net
from utils import threading_utils
from utils import tools
from utils import zip_package

import auth
import isolateserver
import run_isolated


ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
TOOLS_PATH = os.path.join(ROOT_DIR, 'tools')


# The default time to wait for a shard to finish running.
DEFAULT_SHARD_WAIT_TIME = 80 * 60.

# How often to print status updates to stdout in 'collect'.
STATUS_UPDATE_INTERVAL = 15 * 60.


NO_OUTPUT_FOUND = (
  'No output produced by the task, it may have failed to run.\n'
  '\n')


class Failure(Exception):
  """Generic failure."""
  pass


class Manifest(object):
  """Represents a Swarming task manifest.

  Also includes code to zip code and upload itself.
  """
  def __init__(
      self, isolate_server, namespace, isolated_hash, task_name, shards, env,
      dimensions, working_dir, deadline, verbose, profile, priority):
    """Populates a manifest object.
      Args:
        isolate_server - isolate server url.
        namespace - isolate server namespace to use.
        isolated_hash - The manifest's sha-1 that the slave is going to fetch.
        task_name - The name to give the task request.
        shards - The number of swarming shards to request.
        env - environment variables to set.
        dimensions - dimensions to filter the task on.
        working_dir - Relative working directory to start the script.
        deadline - maximum pending time before this task expires.
        verbose - if True, have the slave print more details.
        profile - if True, have the slave print more timing data.
        priority - int between 0 and 1000, lower the higher priority.
    """
    self.isolate_server = isolate_server
    self.namespace = namespace
    # The reason is that swarm_bot doesn't understand compressed data yet. So
    # the data to be downloaded by swarm_bot is in 'default', independent of
    # what run_isolated.py is going to fetch.
    self.storage = isolateserver.get_storage(isolate_server, 'default')

    self.isolated_hash = isolated_hash
    self.bundle = zip_package.ZipPackage(ROOT_DIR)

    self._task_name = task_name
    self._shards = shards
    self._env = env.copy()
    self._dimensions = dimensions.copy()
    self._working_dir = working_dir
    self._deadline = deadline

    self.verbose = bool(verbose)
    self.profile = bool(profile)
    self.priority = priority

    self._isolate_item = None
    self._tasks = []

  def add_task(self, task_name, actions, time_out=2*60*60):
    """Appends a new task as a TestObject to the swarming manifest file.

    Tasks cannot be added once the manifest was uploaded.

    By default, command will be killed after 2 hours of execution.

    See TestObject in services/swarming/src/common/test_request_message.py for
    the valid format.
    """
    assert not self._isolate_item
    self._tasks.append(
        {
          'action': actions,
          'decorate_output': self.verbose,
          'test_name': task_name,
          'hard_time_out': time_out,
        })

  def to_json(self):
    """Exports the current configuration into a swarm-readable manifest file.

    The actual serialization format is defined as a TestCase object as described
    in services/swarming/src/common/test_request_message.py

    This function doesn't mutate the object.
    """
    request = {
      'cleanup': 'root',
      'configurations': [
        # Is a TestConfiguration.
        {
          'config_name': 'isolated',
          'deadline_to_run': self._deadline,
          'dimensions': self._dimensions,
          'min_instances': self._shards,
          'priority': self.priority,
        },
      ],
      'data': [],
      'encoding': 'UTF-8',
      'env_vars': self._env,
      'restart_on_failure': True,
      'test_case_name': self._task_name,
      'tests': self._tasks,
      'working_dir': self._working_dir,
    }
    if self._isolate_item:
      request['data'].append(
          [
            self.storage.get_fetch_url(self._isolate_item),
            'swarm_data.zip',
          ])
    return json.dumps(request, sort_keys=True, separators=(',',':'))

  @property
  def isolate_item(self):
    """Calling this property 'closes' the manifest and it can't be modified
    afterward.
    """
    if self._isolate_item is None:
      self._isolate_item = isolateserver.BufferItem(
          self.bundle.zip_into_buffer(), high_priority=True)
    return self._isolate_item


def zip_and_upload(manifest):
  """Zips up all the files necessary to run a manifest and uploads to Swarming
  master.
  """
  try:
    start_time = now()
    with manifest.storage:
      uploaded = manifest.storage.upload_items([manifest.isolate_item])
    elapsed = now() - start_time
  except (IOError, OSError) as exc:
    tools.report_error('Failed to upload the zip file: %s' % exc)
    return False

  if manifest.isolate_item in uploaded:
    logging.info('Upload complete, time elapsed: %f', elapsed)
  else:
    logging.info('Zip file already on server, time elapsed: %f', elapsed)
  return True


def now():
  """Exists so it can be mocked easily."""
  return time.time()


def get_task_keys(swarm_base_url, task_name):
  """Returns the Swarming task key for each shards of task_name."""
  key_data = urllib.urlencode([('name', task_name)])
  url = '%s/get_matching_test_cases?%s' % (swarm_base_url, key_data)

  for _ in net.retry_loop(max_attempts=net.URL_OPEN_MAX_ATTEMPTS):
    result = net.url_read(url, retry_404=True)
    if result is None:
      raise Failure(
          'Error: Unable to find any task with the name, %s, on swarming server'
          % task_name)

    # TODO(maruel): Compare exact string.
    if 'No matching' in result:
      logging.warning('Unable to find any task with the name, %s, on swarming '
                      'server' % task_name)
      continue
    return json.loads(result)

  raise Failure(
      'Error: Unable to find any task with the name, %s, on swarming server'
      % task_name)


def retrieve_results(base_url, task_key, timeout, should_stop):
  """Retrieves results for a single task_key.

  Returns a dict with results on success or None on failure or timeout.
  """
  assert isinstance(timeout, float), timeout
  params = [('r', task_key)]
  result_url = '%s/get_result?%s' % (base_url, urllib.urlencode(params))
  started = now()
  deadline = started + timeout if timeout else None
  attempt = 0

  while not should_stop.is_set():
    attempt += 1

    # Waiting for too long -> give up.
    current_time = now()
    if deadline and current_time >= deadline:
      logging.error('retrieve_results(%s) timed out on attempt %d',
          base_url, attempt)
      return None

    # Do not spin too fast. Spin faster at the beginning though.
    # Start with 1 sec delay and for each 30 sec of waiting add another second
    # of delay, until hitting 15 sec ceiling.
    if attempt > 1:
      max_delay = min(15, 1 + (current_time - started) / 30.0)
      delay = min(max_delay, deadline - current_time) if deadline else max_delay
      if delay > 0:
        logging.debug('Waiting %.1f sec before retrying', delay)
        should_stop.wait(delay)
        if should_stop.is_set():
          return None

    # Disable internal retries in net.url_read, since we are doing retries
    # ourselves. Do not use retry_404 so should_stop is polled more often.
    response = net.url_read(result_url, retry_404=False, retry_50x=False)

    # Request failed. Try again.
    if response is None:
      continue

    # Got some response, ensure it is JSON dict, retry if not.
    try:
      result = json.loads(response) or {}
      if not isinstance(result, dict):
        raise ValueError()
    except (ValueError, TypeError):
      logging.warning(
          'Received corrupted or invalid data for task_key %s, retrying: %r',
          task_key, response)
      continue

    # Swarming server uses non-empty 'output' value as a flag that task has
    # finished. How to wait for tasks that produce no output is a mystery.
    if result.get('output'):
      return result


def yield_results(
    swarm_base_url, task_keys, timeout, max_threads, print_status_updates):
  """Yields swarming task results from the swarming server as (index, result).

  Duplicate shards are ignored. Shards are yielded in order of completion.
  Timed out shards are NOT yielded at all. Caller can compare number of yielded
  shards with len(task_keys) to verify all shards completed.

  max_threads is optional and is used to limit the number of parallel fetches
  done. Since in general the number of task_keys is in the range <=10, it's not
  worth normally to limit the number threads. Mostly used for testing purposes.

  Yields:
    (index, result). In particular, 'result' is defined as the
    GetRunnerResults() function in services/swarming/server/test_runner.py.
  """
  number_threads = (
      min(max_threads, len(task_keys)) if max_threads else len(task_keys))
  should_stop = threading.Event()
  results_channel = threading_utils.TaskChannel()

  with threading_utils.ThreadPool(number_threads, number_threads, 0) as pool:
    try:
      # Enqueue 'retrieve_results' calls for each shard key to run in parallel.
      for task_key in task_keys:
        pool.add_task(
            0, results_channel.wrap_task(retrieve_results),
            swarm_base_url, task_key, timeout, should_stop)

      # Wait for all of them to finish.
      shards_remaining = range(len(task_keys))
      active_task_count = len(task_keys)
      while active_task_count:
        try:
          result = results_channel.pull(timeout=STATUS_UPDATE_INTERVAL)
        except threading_utils.TaskChannel.Timeout:
          if print_status_updates:
            print(
                'Waiting for results from the following shards: %s' %
                ', '.join(map(str, shards_remaining)))
            sys.stdout.flush()
          continue
        except Exception:
          logging.exception('Unexpected exception in retrieve_results')
          result = None

        # A call to 'retrieve_results' finished (successfully or not).
        active_task_count -= 1
        if not result:
          logging.error('Failed to retrieve the results for a swarming key')
          continue

        shard_index = result['config_instance_index']
        if shard_index in shards_remaining:
          shards_remaining.remove(shard_index)
          yield shard_index, result
        else:
          logging.warning('Ignoring duplicate shard index %d', shard_index)

    finally:
      # Done or aborted with Ctrl+C, kill the remaining threads.
      should_stop.set()


def chromium_setup(manifest):
  """Sets up the commands to run.

  Highly chromium specific.
  """
  # Add uncompressed zip here. It'll be compressed as part of the package sent
  # to Swarming server.
  run_test_name = 'run_isolated.zip'
  manifest.bundle.add_buffer(run_test_name,
    run_isolated.get_as_zip_package().zip_into_buffer(compress=False))

  cleanup_script_name = 'swarm_cleanup.py'
  manifest.bundle.add_file(os.path.join(TOOLS_PATH, cleanup_script_name),
    cleanup_script_name)

  run_cmd = [
    'python', run_test_name,
    '--hash', manifest.isolated_hash,
    '--namespace', manifest.namespace,
  ]
  if file_path.is_url(manifest.isolate_server):
    run_cmd.extend(('--isolate-server', manifest.isolate_server))
  else:
    run_cmd.extend(('--indir', manifest.isolate_server))

  if manifest.verbose or manifest.profile:
    # Have it print the profiling section.
    run_cmd.append('--verbose')
  manifest.add_task('Run Test', run_cmd)

  # Clean up
  manifest.add_task('Clean Up', ['python', cleanup_script_name])


def googletest_setup(env, shards):
  """Sets googletest specific environment variables."""
  if shards > 1:
    env = env.copy()
    env['GTEST_SHARD_INDEX'] = '%(instance_index)s'
    env['GTEST_TOTAL_SHARDS'] = '%(num_instances)s'
  return env


def archive(isolate_server, namespace, isolated, algo, verbose):
  """Archives a .isolated and all the dependencies on the CAC."""
  logging.info('archive(%s, %s, %s)', isolate_server, namespace, isolated)
  tempdir = None
  if file_path.is_url(isolate_server):
    command = 'archive'
    flag = '--isolate-server'
  else:
    command = 'hashtable'
    flag = '--outdir'

  print('Archiving: %s' % isolated)
  try:
    cmd = [
      sys.executable,
      os.path.join(ROOT_DIR, 'isolate.py'),
      command,
      flag, isolate_server,
      '--namespace', namespace,
      '--isolated', isolated,
    ]
    cmd.extend(['--verbose'] * verbose)
    logging.info(' '.join(cmd))
    if subprocess.call(cmd, verbose):
      return
    return isolateserver.hash_file(isolated, algo)
  finally:
    if tempdir:
      shutil.rmtree(tempdir)


def process_manifest(
    swarming, isolate_server, namespace, isolated_hash, task_name, shards,
    dimensions, env, working_dir, deadline, verbose, profile, priority):
  """Processes the manifest file and send off the swarming task request."""
  try:
    manifest = Manifest(
        isolate_server=isolate_server,
        namespace=namespace,
        isolated_hash=isolated_hash,
        task_name=task_name,
        shards=shards,
        dimensions=dimensions,
        env=env,
        working_dir=working_dir,
        deadline=deadline,
        verbose=verbose,
        profile=profile,
        priority=priority)
  except ValueError as e:
    tools.report_error('Unable to process %s: %s' % (task_name, e))
    return 1

  chromium_setup(manifest)

  logging.info('Zipping up files...')
  if not zip_and_upload(manifest):
    return 1

  logging.info('Server: %s', swarming)
  logging.info('Task name: %s', task_name)
  trigger_url = swarming + '/test'
  manifest_text = manifest.to_json()
  result = net.url_read(trigger_url, data={'request': manifest_text})
  if not result:
    tools.report_error(
        'Failed to trigger task %s\n%s' % (task_name, trigger_url))
    return 1
  try:
    json.loads(result)
  except (ValueError, TypeError) as e:
    msg = '\n'.join((
        'Failed to trigger task %s' % task_name,
        'Manifest: %s' % manifest_text,
        'Bad response: %s' % result,
        str(e)))
    tools.report_error(msg)
    return 1
  return 0


def isolated_to_hash(isolate_server, namespace, arg, algo, verbose):
  """Archives a .isolated file if needed.

  Returns the file hash to trigger and a bool specifying if it was a file (True)
  or a hash (False).
  """
  if arg.endswith('.isolated'):
    file_hash = archive(isolate_server, namespace, arg, algo, verbose)
    if not file_hash:
      tools.report_error('Archival failure %s' % arg)
      return None, True
    return file_hash, True
  elif isolateserver.is_valid_hash(arg, algo):
    return arg, False
  else:
    tools.report_error('Invalid hash %s' % arg)
    return None, False


def trigger(
    swarming,
    isolate_server,
    namespace,
    file_hash_or_isolated,
    task_name,
    shards,
    dimensions,
    env,
    working_dir,
    deadline,
    verbose,
    profile,
    priority):
  """Sends off the hash swarming task requests."""
  file_hash, is_file = isolated_to_hash(
      isolate_server, namespace, file_hash_or_isolated, hashlib.sha1, verbose)
  if not file_hash:
    return 1, ''
  if not task_name:
    # If a file name was passed, use its base name of the isolated hash.
    # Otherwise, use user name as an approximation of a task name.
    if is_file:
      key = os.path.splitext(os.path.basename(file_hash_or_isolated))[0]
    else:
      key = getpass.getuser()
    task_name = '%s/%s/%s/%d' % (
        key,
        '_'.join('%s=%s' % (k, v) for k, v in sorted(dimensions.iteritems())),
        file_hash,
        now() * 1000)

  env = googletest_setup(env, shards)
  # TODO(maruel): It should first create a request manifest object, then pass
  # it to a function to zip, archive and trigger.
  result = process_manifest(
      swarming=swarming,
      isolate_server=isolate_server,
      namespace=namespace,
      isolated_hash=file_hash,
      task_name=task_name,
      shards=shards,
      dimensions=dimensions,
      deadline=deadline,
      env=env,
      working_dir=working_dir,
      verbose=verbose,
      profile=profile,
      priority=priority)
  return result, task_name


def decorate_shard_output(result, shard_exit_code):
  """Returns wrapped output for swarming task shard."""
  tag = 'index %s (machine tag: %s, id: %s)' % (
      result['config_instance_index'],
      result['machine_id'],
      result.get('machine_tag', 'unknown'))
  return (
    '\n'
    '================================================================\n'
    'Begin output from shard %s\n'
    '================================================================\n'
    '\n'
    '%s'
    '================================================================\n'
    'End output from shard %s. Return %d\n'
    '================================================================\n'
    ) % (tag, result['output'] or NO_OUTPUT_FOUND, tag, shard_exit_code)


def collect(url, task_name, timeout, decorate, print_status_updates):
  """Retrieves results of a Swarming task."""
  logging.info('Collecting %s', task_name)
  task_keys = get_task_keys(url, task_name)
  if not task_keys:
    raise Failure('No task keys to get results with.')

  exit_code = None
  seen_shards = set()
  for index, output in yield_results(
      url, task_keys, timeout, None, print_status_updates):
    seen_shards.add(index)
    shard_exit_codes = (output['exit_codes'] or '1').split(',')
    shard_exit_code = max(int(i) for i in shard_exit_codes)
    if decorate:
      print decorate_shard_output(output, shard_exit_code)
    else:
      print(
          '%s/%s: %s' % (
              output['machine_id'],
              output['machine_tag'],
              output['exit_codes']))
      print(''.join('  %s\n' % l for l in output['output'].splitlines()))
    exit_code = exit_code or shard_exit_code
  if len(seen_shards) != len(task_keys):
    missing_shards = [x for x in range(len(task_keys)) if x not in seen_shards]
    print >> sys.stderr, ('Results from some shards are missing: %s' %
        ', '.join(map(str, missing_shards)))
    exit_code = exit_code or 1
  return exit_code if exit_code is not None else 1


def add_filter_options(parser):
  parser.filter_group = tools.optparse.OptionGroup(parser, 'Filtering slaves')
  parser.filter_group.add_option(
      '-d', '--dimension', default=[], action='append', nargs=2,
      dest='dimensions', metavar='FOO bar',
      help='dimension to filter on')
  parser.add_option_group(parser.filter_group)


def add_trigger_options(parser):
  """Adds all options to trigger a task on Swarming."""
  isolateserver.add_isolate_server_options(parser, True)
  add_filter_options(parser)

  parser.task_group = tools.optparse.OptionGroup(parser, 'Task properties')
  parser.task_group.add_option(
      '-w', '--working-dir', default='swarm_tests',
      help='Working directory on the swarming slave side. default: %default.')
  parser.task_group.add_option(
      '--working_dir', help=tools.optparse.SUPPRESS_HELP)
  parser.task_group.add_option(
      '-e', '--env', default=[], action='append', nargs=2, metavar='FOO bar',
      help='environment variables to set')
  parser.task_group.add_option(
      '--priority', type='int', default=100,
      help='The lower value, the more important the task is')
  parser.task_group.add_option(
      '--shards', type='int', default=1, help='number of shards to use')
  parser.task_group.add_option(
      '-T', '--task-name',
      help='Display name of the task. It uniquely identifies the task. '
           'Defaults to <base_name>/<dimensions>/<isolated hash>/<timestamp> '
           'if an isolated file is provided, if a hash is provided, it '
           'defaults to <user>/<dimensions>/<isolated hash>/<timestamp>')
  parser.task_group.add_option(
      '--deadline', type='int', default=6*60*60,
      help='Seconds to allow the task to be pending for a bot to run before '
           'this task request expires.')
  parser.add_option_group(parser.task_group)
  # TODO(maruel): This is currently written in a chromium-specific way.
  parser.group_logging.add_option(
      '--profile', action='store_true',
      default=bool(os.environ.get('ISOLATE_DEBUG')),
      help='Have run_isolated.py print profiling info')


def process_trigger_options(parser, options, args):
  isolateserver.process_isolate_server_options(parser, options)
  if len(args) != 1:
    parser.error('Must pass one .isolated file or its hash (sha1).')
  options.dimensions = dict(options.dimensions)
  if not options.dimensions:
    parser.error('Please at least specify one --dimension')


def add_collect_options(parser):
  parser.server_group.add_option(
      '-t', '--timeout',
      type='float',
      default=DEFAULT_SHARD_WAIT_TIME,
      help='Timeout to wait for result, set to 0 for no timeout; default: '
           '%default s')
  parser.group_logging.add_option(
      '--decorate', action='store_true', help='Decorate output')
  parser.group_logging.add_option(
      '--print-status-updates', action='store_true',
      help='Print periodic status updates')


@subcommand.usage('task_name')
def CMDcollect(parser, args):
  """Retrieves results of a Swarming task.

  The result can be in multiple part if the execution was sharded. It can
  potentially have retries.
  """
  add_collect_options(parser)
  (options, args) = parser.parse_args(args)
  if not args:
    parser.error('Must specify one task name.')
  elif len(args) > 1:
    parser.error('Must specify only one task name.')

  try:
    return collect(
        options.swarming,
        args[0],
        options.timeout,
        options.decorate,
        options.print_status_updates)
  except Failure as e:
    tools.report_error(e)
    return 1


def CMDquery(parser, args):
  """Returns information about the bots connected to the Swarming server."""
  add_filter_options(parser)
  parser.filter_group.add_option(
      '--dead-only', action='store_true',
      help='Only print dead bots, useful to reap them and reimage broken bots')
  parser.filter_group.add_option(
      '-k', '--keep-dead', action='store_true',
      help='Do not filter out dead bots')
  parser.filter_group.add_option(
      '-b', '--bare', action='store_true',
      help='Do not print out dimensions')
  options, args = parser.parse_args(args)

  if options.keep_dead and options.dead_only:
    parser.error('Use only one of --keep-dead and --dead-only')
  service = net.get_http_service(options.swarming)
  data = service.json_request('GET', '/swarming/api/v1/bots')
  if data is None:
    print >> sys.stderr, 'Failed to access %s' % options.swarming
    return 1
  timeout = datetime.timedelta(seconds=data['machine_death_timeout'])
  utcnow = datetime.datetime.utcnow()
  for machine in natsort.natsorted(data['machines'], key=lambda x: x['tag']):
    last_seen = datetime.datetime.strptime(
        machine['last_seen'], '%Y-%m-%d %H:%M:%S')
    is_dead = utcnow - last_seen > timeout
    if options.dead_only:
      if not is_dead:
        continue
    elif not options.keep_dead and is_dead:
      continue

    # If the user requested to filter on dimensions, ensure the bot has all the
    # dimensions requested.
    dimensions = machine['dimensions']
    for key, value in options.dimensions:
      if key not in dimensions:
        break
      # A bot can have multiple value for a key, for example,
      # {'os': ['Windows', 'Windows-6.1']}, so that --dimension os=Windows will
      # be accepted.
      if isinstance(dimensions[key], list):
        if value not in dimensions[key]:
          break
      else:
        if value != dimensions[key]:
          break
    else:
      print machine['tag']
      if not options.bare:
        print '  %s' % dimensions
  return 0


@subcommand.usage('[hash|isolated]')
def CMDrun(parser, args):
  """Triggers a task and wait for the results.

  Basically, does everything to run a command remotely.
  """
  add_trigger_options(parser)
  add_collect_options(parser)
  options, args = parser.parse_args(args)
  process_trigger_options(parser, options, args)

  try:
    result, task_name = trigger(
        swarming=options.swarming,
        isolate_server=options.isolate_server or options.indir,
        namespace=options.namespace,
        file_hash_or_isolated=args[0],
        task_name=options.task_name,
        shards=options.shards,
        dimensions=options.dimensions,
        env=dict(options.env),
        working_dir=options.working_dir,
        deadline=options.deadline,
        verbose=options.verbose,
        profile=options.profile,
        priority=options.priority)
  except Failure as e:
    tools.report_error(
        'Failed to trigger %s(%s): %s' %
        (options.task_name, args[0], e.args[0]))
    return 1
  if result:
    tools.report_error('Failed to trigger the task.')
    return result
  if task_name != options.task_name:
    print('Triggered task: %s' % task_name)
  try:
    return collect(
        options.swarming,
        task_name,
        options.timeout,
        options.decorate,
        options.print_status_updates)
  except Failure as e:
    tools.report_error(e)
    return 1


@subcommand.usage("(hash|isolated)")
def CMDtrigger(parser, args):
  """Triggers a Swarming task.

  Accepts either the hash (sha1) of a .isolated file already uploaded or the
  path to an .isolated file to archive, packages it if needed and sends a
  Swarming manifest file to the Swarming server.

  If an .isolated file is specified instead of an hash, it is first archived.
  """
  add_trigger_options(parser)
  options, args = parser.parse_args(args)
  process_trigger_options(parser, options, args)

  try:
    result, task_name = trigger(
        swarming=options.swarming,
        isolate_server=options.isolate_server or options.indir,
        namespace=options.namespace,
        file_hash_or_isolated=args[0],
        task_name=options.task_name,
        dimensions=options.dimensions,
        shards=options.shards,
        env=dict(options.env),
        working_dir=options.working_dir,
        deadline=options.deadline,
        verbose=options.verbose,
        profile=options.profile,
        priority=options.priority)
    if task_name != options.task_name and not result:
      print('Triggered task: %s' % task_name)
    return result
  except Failure as e:
    tools.report_error(e)
    return 1


class OptionParserSwarming(tools.OptionParserWithLogging):
  def __init__(self, **kwargs):
    tools.OptionParserWithLogging.__init__(
        self, prog='swarming.py', **kwargs)
    self.server_group = tools.optparse.OptionGroup(self, 'Server')
    self.server_group.add_option(
        '-S', '--swarming',
        metavar='URL', default=os.environ.get('SWARMING_SERVER', ''),
        help='Swarming server to use')
    self.add_option_group(self.server_group)
    auth.add_auth_options(self)

  def parse_args(self, *args, **kwargs):
    options, args = tools.OptionParserWithLogging.parse_args(
        self, *args, **kwargs)
    options.swarming = options.swarming.rstrip('/')
    if not options.swarming:
      self.error('--swarming is required.')
    auth.process_auth_options(self, options)
    return options, args


def main(args):
  dispatcher = subcommand.CommandDispatcher(__name__)
  try:
    return dispatcher.execute(OptionParserSwarming(version=__version__), args)
  except Exception as e:
    tools.report_error(e)
    return 1


if __name__ == '__main__':
  fix_encoding.fix_encoding()
  tools.disable_buffering()
  colorama.init()
  sys.exit(main(sys.argv[1:]))