#!/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 datetime
import optparse
import os
import sys
import time

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"

# CL that uses LLVM to build the peppy image.
USE_LLVM_PATCH = "295217"

# The boards on which we run weekly reports
WEEKLY_REPORT_BOARDS = ["lumpy"]

CROSTC_ROOT = "/usr/local/google/crostc"
ROLE_ACCOUNT = "mobiletc-prebuild"
TOOLCHAIN_DIR = os.path.dirname(os.path.realpath(__file__))
MAIL_PROGRAM = "~/var/bin/mail-sheriff"
WEEKLY_REPORTS_ROOT = os.path.join(CROSTC_ROOT, "weekly_test_data")
PENDING_ARCHIVES_DIR = os.path.join(CROSTC_ROOT, "pending_archives")
NIGHTLY_TESTS_DIR = os.path.join(CROSTC_ROOT, "nightly_test_reports")

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

  def __init__(self, board, remotes, chromeos_root, weekday, patches, noschedv2=False):
    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
    self._patches = patches.split(',')
    self._patches_string = '_'.join(str(p) for p in self._patches)
    self._noschedv2 = noschedv2

    if not weekday:
      self._weekday = time.strftime("%a")
    else:
      self._weekday = weekday
    timestamp = datetime.datetime.strftime(datetime.datetime.now(),
                                           "%Y-%m-%d_%H:%M:%S")
    self._reports_dir = os.path.join(NIGHTLY_TESTS_DIR,
        "%s.%s" % (timestamp, board),
        )

  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 != 0:
      raise RuntimeError("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

    compiler_string = "gcc"
    if self._patches_string == USE_LLVM_PATCH:
      experiment_file_name = "%s_llvm_experiment.txt" % self._board
      compiler_string = "llvm"

    experiment_file = os.path.join (experiment_file_dir,
                                    experiment_file_name)
    experiment_header = """
    board: %s
    remote: %s
    retries: 1
    """ % (self._board, self._remotes)
    experiment_tests = """
    benchmark: all_toolchain_perf_pure_telemetry {
      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
            compiler: gcc
          }
          """ % (self._chromeos_root, vanilla_image)
      print >> f, official_image

      label_string = "%s_trybot_image" % compiler_string
      if USE_NEXT_GCC_PATCH in self._patches:
        label_string = "gcc_next_trybot_image"

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

    crosperf = os.path.join(TOOLCHAIN_DIR,
                            "crosperf",
                            "crosperf")
    noschedv2_opts = '--noschedv2' if self._noschedv2 else ''
    command = ("{crosperf} --no_email=True --results_dir={r_dir} "
               "--json_report=True {noschedv2_opts} {exp_file}").format(
                crosperf=crosperf,
                r_dir=self._reports_dir,
                noschedv2_opts=noschedv2_opts,
                exp_file=experiment_file)

    ret = self._ce.RunCommand(command)
    if ret != 0:
      raise RuntimeError("Couldn't run crosperf!")
    else:
      # Copy json report to pending archives directory.
      command = "cp %s/*.json %s/." % (self._reports_dir, PENDING_ARCHIVES_DIR)
      ret = self._ce.RunCommand(command)
    return

  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/chromiumos_test_image.bin; "
             "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 _SendEmail(self):
    """Find email message generated by crosperf and send it."""
    filename = os.path.join(self._reports_dir,
                            "msg_body.html")
    if (os.path.exists(filename) and
        os.path.exists(os.path.expanduser(MAIL_PROGRAM))):
      email_title = "buildbot test results"
      if self._patches_string == USE_LLVM_PATCH:
        email_title = "buildbot llvm test results"
      command = ('cat %s | %s -s "%s, %s" -team -html'
                 % (filename, MAIL_PROGRAM, email_title, self._board))
      self._ce.RunCommand(command)

  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.
    """
    date_str = datetime.date.today()
    description = "master_%s_%s_%s" % (self._patches_string,
                                       self._build,
                                       date_str)
    trybot_image = buildbot_utils.GetTrybotImage(self._chromeos_root,
                                                 self._build,
                                                 self._patches,
                                                 description,
                                                 build_toolchain=True)

    vanilla_image = self._ParseVanillaImage(trybot_image)

    print ("trybot_image: %s" % trybot_image)
    print ("vanilla_image: %s" % vanilla_image)
    if len(trybot_image) == 0:
      self._l.LogError("Unable to find trybot_image for %s!" % description)
      return 1
    if len(vanilla_image) == 0:
      self._l.LogError("Unable to find vanilla image for %s!" % description)
      return 1
    if os.getlogin() == ROLE_ACCOUNT:
      self._FinishSetup()

    self._TestImages(trybot_image, vanilla_image)
    self._SendEmail()
    if (self._patches_string == USE_NEXT_GCC_PATCH and
        self._board in WEEKLY_REPORT_BOARDS):
      # 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.")
  parser.add_option("--patch",
                    dest="patches",
                    help="The patches to use for the testing, "
                    "seprate the patch numbers with ',' "
                    "for more than one patches.")
  parser.add_option("--noschedv2",
                    dest="noschedv2",
                    action="store_true",
                    default=False,
                    help="Pass --noschedv2 to crosperf.")

  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
  if options.patches:
    patches = options.patches
  else:
    patches = USE_NEXT_GCC_PATCH

  fc = ToolchainComparator(options.board, options.remote,
                           options.chromeos_root, options.weekday, patches,
                           options.noschedv2)
  return fc.DoAll()


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