#!/usr/bin/python
"""
Script for running nightly compiler tests on ChromeOS.

This script launches a buildbot to build ChromeOS with the latest compiler on
a particular board; then it finds and downloads the trybot image and the
corresponding official image, and runs crosperf performance tests comparing
the two.  It then generates a report, emails it to the c-compiler-chrome, as
well as copying the images into the seven-day reports directory.
"""

# Script to test different toolchains against ChromeOS benchmarks.
import optparse
import os
import sys
import time
import urllib2

from utils import command_executer
from utils import logger

from utils import buildbot_utils

# CL that updated GCC ebuilds to use 'next_gcc'.
USE_NEXT_GCC_PATCH ="230260"

WEEKLY_REPORTS_ROOT = "/usr/local/google/crostc/weekly_test_data"
ROLE_ACCOUNT = "mobiletc-prebuild"
TOOLCHAIN_DIR = os.path.dirname(os.path.realpath(__file__))


class ToolchainComparator():
  """
  Class for doing the nightly tests work.
  """

  def __init__(self, board, remotes, chromeos_root, weekday):
    self._board = board
    self._remotes = remotes
    self._chromeos_root = chromeos_root
    self._base_dir = os.getcwd()
    self._ce = command_executer.GetCommandExecuter()
    self._l = logger.GetLogger()
    self._build = "%s-release" % board
    if not weekday:
      self._weekday = time.strftime("%a")
    else:
      self._weekday = weekday

  def _ParseVanillaImage(self, trybot_image):
    """
    Parse a trybot artifact name to get corresponding vanilla image.

    This function takes an artifact name, such as
    'trybot-daisy-release/R40-6394.0.0-b1389', and returns the
    corresponding official build name, e.g. 'daisy-release/R40-6394.0.0'.
    """
    start_pos = trybot_image.find(self._build)
    end_pos = trybot_image.rfind("-b")
    vanilla_image = trybot_image[start_pos:end_pos]
    return vanilla_image


  def _FinishSetup(self):
    """
    Make sure testing_rsa file is properly set up.
    """
    # Fix protections on ssh key
    command = ("chmod 600 /var/cache/chromeos-cache/distfiles/target"
               "/chrome-src-internal/src/third_party/chromite/ssh_keys"
               "/testing_rsa")
    ret_val = self._ce.ChrootRunCommand(self._chromeos_root, command)
    if ret_val:
      raise Exception("chmod for testing_rsa failed")

  def _TestImages(self, trybot_image, vanilla_image):
    """
    Create crosperf experiment file.

    Given the names of the trybot and vanilla images, create the
    appropriate crosperf experiment file and launch crosperf on it.
    """
    experiment_file_dir = os.path.join (self._chromeos_root, "..",
                                        self._weekday)
    experiment_file_name = "%s_toolchain_experiment.txt" % self._board
    experiment_file = os.path.join (experiment_file_dir,
                                    experiment_file_name)
    experiment_header = """
    board: %s
    remote: %s
    """ % (self._board, self._remotes)
    experiment_tests = """
    benchmark: all_perfv2 {
      suite: telemetry_Crosperf
      iterations: 3
    }
    """
    with open(experiment_file, "w") as f:
      print >> f, experiment_header
      print >> f, experiment_tests

      # Now add vanilla to test file.
      official_image = """
          vanilla_image {
            chromeos_root: %s
            build: %s
          }
          """ % (self._chromeos_root, vanilla_image)
      print >> f, official_image

      experiment_image = """
          test_image {
            chromeos_root: %s
            build: %s
          }
          """ % (self._chromeos_root, trybot_image)
      print >> f, experiment_image

    crosperf = os.path.join(TOOLCHAIN_DIR,
                            "crosperf",
                            "crosperf")
    command = "%s --email=c-compiler-chrome %s" % (crosperf, experiment_file)
    ret = self._ce.RunCommand(command)
    if ret:
      raise Exception("Couldn't run crosperf!")
    return ret


  def _CopyWeeklyReportFiles(self, trybot_image, vanilla_image):
    """
    Put files in place for running seven-day reports.

    Create tar files of the custom and official images and copy them
    to the weekly reports directory, so they exist when the weekly report
    gets generated.  IMPORTANT NOTE: This function must run *after*
    crosperf has been run; otherwise the vanilla images will not be there.
    """

    dry_run = False
    if (os.getlogin() != ROLE_ACCOUNT):
      self._l.LogOutput("Running this from non-role account; not copying "
                        "tar files for weekly reports.")
      dry_run = True

    images_path = os.path.join(os.path.realpath(self._chromeos_root),
                               "chroot/tmp")

    data_dir = os.path.join(WEEKLY_REPORTS_ROOT, self._board)
    dest_dir = os.path.join (data_dir, self._weekday)
    if not os.path.exists(dest_dir):
      os.makedirs(dest_dir)

    # Make sure dest_dir is empty (clean out last week's data).
    cmd = "cd %s; rm -Rf %s_*_image*" % (dest_dir, self._weekday)
    if dry_run:
      print "CMD: %s" % cmd
    else:
      self._ce.RunCommand(cmd)

    # Now create new tar files and copy them over.
    labels = [ "test", "vanilla" ]
    for label_name in labels:
      if label_name == "test":
        test_path = trybot_image
      else:
        test_path = vanilla_image
      tar_file_name = "%s_%s_image.tar" % (self._weekday, label_name)
      cmd = "cd %s; tar -cvf %s %s/*; cp %s %s/." % (images_path,
                                                     tar_file_name,
                                                     test_path,
                                                     tar_file_name,
                                                     dest_dir)
      if dry_run:
        print "CMD: %s" % cmd
        tar_ret = 0
      else:
        tar_ret = self._ce.RunCommand(cmd)
      if tar_ret:
        self._l.LogOutput("Error while creating/copying test tar file(%s)."
                          % tar_file_name)


  def DoAll(self):
    """
    Main function inside ToolchainComparator class.

    Launch trybot, get image names, create crosperf experiment file, run
    crosperf, and copy images into seven-day report directories.
    """

    description = "master_%s_%s" % (USE_NEXT_GCC_PATCH, self._build)
    trybot_image = buildbot_utils.GetTrybotImage(self._chromeos_root,
                                                 self._build,
                                                 [ USE_NEXT_GCC_PATCH ],
                                                 description)

    vanilla_image = self._ParseVanillaImage(trybot_image)

    print ("trybot_image: %s" % trybot_image)
    print ("vanilla_image: %s" % vanilla_image)
    if os.getlogin() == ROLE_ACCOUNT:
      self._FinishSetup()

    if not self._TestImages(trybot_image, vanilla_image):
      # Only try to copy the image files if the test runs ran successfully.
      self._CopyWeeklyReportFiles(trybot_image, vanilla_image)
    return 0


def Main(argv):
  """The main function."""

  # Common initializations
  command_executer.InitCommandExecuter()
  parser = optparse.OptionParser()
  parser.add_option("--remote",
                    dest="remote",
                    help="Remote machines to run tests on.")
  parser.add_option("--board",
                    dest="board",
                    default="x86-zgb",
                    help="The target board.")
  parser.add_option("--chromeos_root",
                    dest="chromeos_root",
                    help="The chromeos root from which to run tests.")
  parser.add_option("--weekday", default="",
                    dest="weekday",
                    help="The day of the week for which to run tests.")
  options, _ = parser.parse_args(argv)
  if not options.board:
    print "Please give a board."
    return 1
  if not options.remote:
    print "Please give at least one remote machine."
    return 1
  if not options.chromeos_root:
    print "Please specify the ChromeOS root directory."
    return 1

  fc = ToolchainComparator(options.board, options.remote,
                           options.chromeos_root, options.weekday)
  return fc.DoAll()


if __name__ == "__main__":
  retval = Main(sys.argv)
  sys.exit(retval)