#!/usr/bin/env python2.7
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"""Run performance tests locally or remotely."""

import argparse
import itertools
import jobset
import multiprocessing
import os
import subprocess
import sys
import tempfile
import time
import uuid
import performance.config as config


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


_REMOTE_HOST_USERNAME = 'jenkins'


class QpsWorkerJob:
  """Encapsulates a qps worker server job."""

  def __init__(self, spec, language, host_and_port):
    self._spec = spec
    self.language = language
    self.host_and_port = host_and_port
    self._job = jobset.Job(spec, bin_hash=None, newline_on_success=True, travis=True, add_env={})

  def is_running(self):
    """Polls a job and returns True if given job is still running."""
    return self._job.state(jobset.NoCache()) == jobset._RUNNING

  def kill(self):
    return self._job.kill()


def create_qpsworker_job(language, shortname=None,
                         port=10000, remote_host=None):
  # TODO: support more languages
  cmdline = language.worker_cmdline() + ['--driver_port=%s' % port]
  if remote_host:
    user_at_host = '%s@%s' % (_REMOTE_HOST_USERNAME, remote_host)
    cmdline = ['ssh',
               str(user_at_host),
               'cd ~/performance_workspace/grpc/ && %s' % ' '.join(cmdline)]
    host_and_port='%s:%s' % (remote_host, port)
  else:
    host_and_port='localhost:%s' % port

  jobspec = jobset.JobSpec(
      cmdline=cmdline,
      shortname=shortname,
      timeout_seconds=15*60)
  return QpsWorkerJob(jobspec, language, host_and_port)


def create_scenario_jobspec(scenario_name, driver_args, workers, remote_host=None):
  """Runs one scenario using QPS driver."""
  # setting QPS_WORKERS env variable here makes sure it works with SSH too.
  cmd = 'QPS_WORKERS="%s" bins/opt/qps_driver ' % ','.join(workers)
  cmd += ' '.join(driver_args)
  if remote_host:
    user_at_host = '%s@%s' % (_REMOTE_HOST_USERNAME, remote_host)
    cmd = 'ssh %s "cd ~/performance_workspace/grpc/ && %s"' % (user_at_host, cmd)

  return jobset.JobSpec(
      cmdline=[cmd],
      shortname='qps_driver.%s' % scenario_name,
      timeout_seconds=3*60,
      shell=True,
      verbose_success=True)


def archive_repo():
  """Archives local version of repo including submodules."""
  # TODO: also archive grpc-go and grpc-java repos
  archive_job = jobset.JobSpec(
      cmdline=['tar', '-cf', '../grpc.tar', '../grpc/'],
      shortname='archive_repo',
      timeout_seconds=3*60)

  jobset.message('START', 'Archiving local repository.', do_newline=True)
  num_failures, _ = jobset.run(
      [archive_job], newline_on_success=True, maxjobs=1)
  if num_failures == 0:
    jobset.message('SUCCESS',
                   'Archive with local repository create successfully.',
                   do_newline=True)
  else:
    jobset.message('FAILED', 'Failed to archive local repository.',
                   do_newline=True)
    sys.exit(1)


def prepare_remote_hosts(hosts):
  """Prepares remote hosts."""
  prepare_jobs = []
  for host in hosts:
    user_at_host = '%s@%s' % (_REMOTE_HOST_USERNAME, host)
    prepare_jobs.append(
        jobset.JobSpec(
            cmdline=['tools/run_tests/performance/remote_host_prepare.sh'],
            shortname='remote_host_prepare.%s' % host,
            environ = {'USER_AT_HOST': user_at_host},
            timeout_seconds=5*60))
  jobset.message('START', 'Preparing remote hosts.', do_newline=True)
  num_failures, _ = jobset.run(
      prepare_jobs, newline_on_success=True, maxjobs=10)
  if num_failures == 0:
    jobset.message('SUCCESS',
                   'Remote hosts ready to start build.',
                   do_newline=True)
  else:
    jobset.message('FAILED', 'Failed to prepare remote hosts.',
                   do_newline=True)
    sys.exit(1)


def build_on_remote_hosts(hosts, languages=config.LANGUAGES.keys(), build_local=False):
  """Builds performance worker on remote hosts (and maybe also locally)."""
  build_timeout = 15*60
  build_jobs = []
  for host in hosts:
    user_at_host = '%s@%s' % (_REMOTE_HOST_USERNAME, host)
    build_jobs.append(
        jobset.JobSpec(
            cmdline=['tools/run_tests/performance/remote_host_build.sh'] + languages,
            shortname='remote_host_build.%s' % host,
            environ = {'USER_AT_HOST': user_at_host, 'CONFIG': 'opt'},
            timeout_seconds=build_timeout))
  if build_local:
    # Build locally as well
    build_jobs.append(
        jobset.JobSpec(
            cmdline=['tools/run_tests/performance/build_performance.sh'] + languages,
            shortname='local_build',
            environ = {'CONFIG': 'opt'},
            timeout_seconds=build_timeout))
  jobset.message('START', 'Building.', do_newline=True)
  num_failures, _ = jobset.run(
      build_jobs, newline_on_success=True, maxjobs=10)
  if num_failures == 0:
    jobset.message('SUCCESS',
                   'Built successfully.',
                   do_newline=True)
  else:
    jobset.message('FAILED', 'Build failed.',
                   do_newline=True)
    sys.exit(1)


def start_qpsworkers(languages, worker_hosts):
  """Starts QPS workers as background jobs."""
  if not worker_hosts:
    # run two workers locally (for each language)
    workers=[(None, 10000), (None, 10010)]
  elif len(worker_hosts) == 1:
    # run two workers on the remote host (for each language)
    workers=[(worker_hosts[0], 10000), (worker_hosts[0], 10010)]
  else:
    # run one worker per each remote host (for each language)
    workers=[(worker_host, 10000) for worker_host in worker_hosts]

  return [create_qpsworker_job(language,
                               shortname= 'qps_worker_%s_%s' % (language,
                                                                worker_idx),
                               port=worker[1] + language.worker_port_offset(),
                               remote_host=worker[0])
          for language in languages
          for worker_idx, worker in enumerate(workers)]


def create_scenarios(languages, workers_by_lang, remote_host=None):
  """Create jobspecs for scenarios to run."""
  scenarios = []
  for language in languages:
    for scenario_name, driver_args in language.scenarios().iteritems():
      scenario = create_scenario_jobspec(scenario_name,
                                         driver_args,
                                         workers_by_lang[str(language)],
                                         remote_host=remote_host)
      scenarios.append(scenario)

  # the very last scenario requests shutting down the workers.
  all_workers = [worker
                 for workers in workers_by_lang.values()
                 for worker in workers]
  scenarios.append(create_scenario_jobspec('quit_workers',
                                           ['--quit=true'],
                                           all_workers,
                                           remote_host=remote_host))
  return scenarios


def finish_qps_workers(jobs):
  """Waits for given jobs to finish and eventually kills them."""
  retries = 0
  while any(job.is_running() for job in jobs):
    for job in qpsworker_jobs:
      if job.is_running():
        print 'QPS worker "%s" is still running.' % job.host_and_port
    if retries > 10:
      print 'Killing all QPS workers.'
      for job in jobs:
        job.kill()
    retries += 1
    time.sleep(3)
  print 'All QPS workers finished.'


argp = argparse.ArgumentParser(description='Run performance tests.')
argp.add_argument('-l', '--language',
                  choices=['all'] + sorted(config.LANGUAGES.keys()),
                  nargs='+',
                  default=['all'],
                  help='Languages to benchmark.')
argp.add_argument('--remote_driver_host',
                  default=None,
                  help='Run QPS driver on given host. By default, QPS driver is run locally.')
argp.add_argument('--remote_worker_host',
                  nargs='+',
                  default=[],
                  help='Worker hosts where to start QPS workers.')

args = argp.parse_args()

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

# Put together set of remote hosts where to run and build
remote_hosts = set()
if args.remote_worker_host:
  for host in args.remote_worker_host:
    remote_hosts.add(host)
if args.remote_driver_host:
  remote_hosts.add(args.remote_driver_host)

if remote_hosts:
  archive_repo()
  prepare_remote_hosts(remote_hosts)

build_local = False
if not args.remote_driver_host:
  build_local = True
build_on_remote_hosts(remote_hosts, languages=[str(l) for l in languages], build_local=build_local)

qpsworker_jobs = start_qpsworkers(languages, args.remote_worker_host)

# get list of worker addresses for each language.
worker_addresses = dict([(str(language), []) for language in languages])
for job in qpsworker_jobs:
  worker_addresses[str(job.language)].append(job.host_and_port)

try:
  scenarios = create_scenarios(languages,
                               workers_by_lang=worker_addresses,
                               remote_host=args.remote_driver_host)
  if not scenarios:
    raise Exception('No scenarios to run')

  jobset.message('START', 'Running scenarios.', do_newline=True)
  num_failures, _ = jobset.run(
      scenarios, newline_on_success=True, maxjobs=1)
  if num_failures == 0:
    jobset.message('SUCCESS',
                   'All scenarios finished successfully.',
                   do_newline=True)
  else:
    jobset.message('FAILED', 'Some of the scenarios failed.',
                   do_newline=True)
    sys.exit(1)
finally:
  finish_qps_workers(qpsworker_jobs)