# Copyright 2015 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Module containing the simple builders."""

from __future__ import print_function

import collections

from chromite.cbuildbot import afdo
from chromite.cbuildbot import cbuildbot_config
from chromite.cbuildbot import constants
from chromite.cbuildbot import results_lib
from chromite.cbuildbot.builders import generic_builders
from chromite.cbuildbot.stages import afdo_stages
from chromite.cbuildbot.stages import artifact_stages
from chromite.cbuildbot.stages import build_stages
from chromite.cbuildbot.stages import chrome_stages
from chromite.cbuildbot.stages import completion_stages
from chromite.cbuildbot.stages import generic_stages
from chromite.cbuildbot.stages import release_stages
from chromite.cbuildbot.stages import sync_stages
from chromite.cbuildbot.stages import test_stages
from chromite.lib import cros_logging as logging
from chromite.lib import parallel


# TODO: SimpleBuilder needs to be broken up big time.


BoardConfig = collections.namedtuple('BoardConfig', ['board', 'name'])


class SimpleBuilder(generic_builders.Builder):
  """Builder that performs basic vetting operations."""

  def GetSyncInstance(self):
    """Sync to lkgm or TOT as necessary.

    Returns:
      The instance of the sync stage to run.
    """
    if self._run.options.force_version:
      sync_stage = self._GetStageInstance(
          sync_stages.ManifestVersionedSyncStage)
    elif self._run.config.use_lkgm:
      sync_stage = self._GetStageInstance(sync_stages.LKGMSyncStage)
    elif self._run.config.use_chrome_lkgm:
      sync_stage = self._GetStageInstance(chrome_stages.ChromeLKGMSyncStage)
    else:
      sync_stage = self._GetStageInstance(sync_stages.SyncStage)

    return sync_stage

  def _RunHWTests(self, builder_run, board):
    """Run hwtest-related stages for the specified board.

    Args:
      builder_run: BuilderRun object for these background stages.
      board: Board name.
    """
    parallel_stages = []

    # We can not run hw tests without archiving the payloads.
    if builder_run.options.archive:
      for suite_config in builder_run.config.hw_tests:
        stage_class = None
        if suite_config.async:
          stage_class = test_stages.ASyncHWTestStage
        elif suite_config.suite == constants.HWTEST_AU_SUITE:
          stage_class = test_stages.AUTestStage
        else:
          stage_class = test_stages.HWTestStage
        if suite_config.blocking:
          self._RunStage(stage_class, board, suite_config,
                         builder_run=builder_run)
        else:
          new_stage = self._GetStageInstance(stage_class, board,
                                             suite_config,
                                             builder_run=builder_run)
          parallel_stages.append(new_stage)

    self._RunParallelStages(parallel_stages)

  def _RunBackgroundStagesForBoardAndMarkAsSuccessful(self, builder_run, board):
    """Run background board-specific stages for the specified board.

    After finishing the build, mark it as successful.

    Args:
      builder_run: BuilderRun object for these background stages.
      board: Board name.
    """
    self._RunBackgroundStagesForBoard(builder_run, board)
    board_runattrs = builder_run.GetBoardRunAttrs(board)
    board_runattrs.SetParallel('success', True)

  def _RunBackgroundStagesForBoard(self, builder_run, board):
    """Run background board-specific stages for the specified board.

    Used by _RunBackgroundStagesForBoardAndMarkAsSuccessful. Callers should use
    that method instead.

    Args:
      builder_run: BuilderRun object for these background stages.
      board: Board name.
    """
    config = builder_run.config

    # TODO(mtennant): This is the last usage of self.archive_stages.  We can
    # kill it once we migrate its uses to BuilderRun so that none of the
    # stages below need it as an argument.
    archive_stage = self.archive_stages[BoardConfig(board, config.name)]
    if config.afdo_generate_min:
      self._RunParallelStages([archive_stage])
      return

    # paygen can't complete without push_image.
    assert not config.paygen or config.push_image

    if config.build_packages_in_background:
      self._RunStage(build_stages.BuildPackagesStage, board,
                     update_metadata=True, builder_run=builder_run,
                     afdo_use=config.afdo_use)

    if builder_run.config.compilecheck or builder_run.options.compilecheck:
      self._RunStage(test_stages.UnitTestStage, board,
                     builder_run=builder_run)
      return

    # Build the image first before doing anything else.
    # TODO(davidjames): Remove this lock once http://crbug.com/352994 is fixed.
    with self._build_image_lock:
      self._RunStage(build_stages.BuildImageStage, board,
                     builder_run=builder_run, afdo_use=config.afdo_use)

    # While this stage list is run in parallel, the order here dictates the
    # order that things will be shown in the log.  So group things together
    # that make sense when read in order.  Also keep in mind that, since we
    # gather output manually, early slow stages will prevent any output from
    # later stages showing up until it finishes.
    stage_list = [[chrome_stages.ChromeSDKStage, board]]

    if config.vm_test_runs > 1:
      # Run the VMTests multiple times to see if they fail.
      stage_list += [
          [generic_stages.RepeatStage, config.vm_test_runs,
           test_stages.VMTestStage, board]]
    else:
      # Give the VMTests one retry attempt in case failures are flaky.
      stage_list += [[generic_stages.RetryStage, 1, test_stages.VMTestStage,
                      board]]

    if config.afdo_generate:
      stage_list += [[afdo_stages.AFDODataGenerateStage, board]]

    stage_list += [
        [release_stages.SignerTestStage, board, archive_stage],
        [release_stages.PaygenStage, board, archive_stage],
        [test_stages.ImageTestStage, board],
        [test_stages.UnitTestStage, board],
        [artifact_stages.UploadPrebuiltsStage, board],
        [artifact_stages.DevInstallerPrebuiltsStage, board],
        [artifact_stages.DebugSymbolsStage, board],
        [artifact_stages.CPEExportStage, board],
        [artifact_stages.UploadTestArtifactsStage, board],
    ]

    stage_objs = [self._GetStageInstance(*x, builder_run=builder_run)
                  for x in stage_list]

    parallel.RunParallelSteps([
        lambda: self._RunParallelStages(stage_objs + [archive_stage]),
        lambda: self._RunHWTests(builder_run, board),
    ])

  def RunSetupBoard(self):
    """Run the SetupBoard stage for all child configs and boards."""
    for builder_run in self._run.GetUngroupedBuilderRuns():
      for board in builder_run.config.boards:
        self._RunStage(build_stages.SetupBoardStage, board,
                       builder_run=builder_run)

  def _RunMasterPaladinOrChromePFQBuild(self):
    """Runs through the stages of the paladin or chrome PFQ master build."""
    self._RunStage(build_stages.InitSDKStage)
    self._RunStage(build_stages.UprevStage)
    # The CQ/Chrome PFQ master will not actually run the SyncChrome stage, but
    # we want the logic that gets triggered when SyncChrome stage is skipped.
    self._RunStage(chrome_stages.SyncChromeStage)
    self._RunStage(test_stages.BinhostTestStage)
    self._RunStage(artifact_stages.MasterUploadPrebuiltsStage)

  def _RunDefaultTypeBuild(self):
    """Runs through the stages of a non-special-type build."""
    self._RunStage(build_stages.InitSDKStage)
    self._RunStage(build_stages.UprevStage)
    self.RunSetupBoard()
    self._RunStage(chrome_stages.SyncChromeStage)
    self._RunStage(chrome_stages.PatchChromeStage)
    self._RunStage(test_stages.BinhostTestStage)

    # Prepare stages to run in background.  If child_configs exist then
    # run each of those here, otherwise use default config.
    builder_runs = self._run.GetUngroupedBuilderRuns()

    tasks = []
    for builder_run in builder_runs:
      # Prepare a local archive directory for each "run".
      builder_run.GetArchive().SetupArchivePath()

      for board in builder_run.config.boards:
        archive_stage = self._GetStageInstance(
            artifact_stages.ArchiveStage, board, builder_run=builder_run,
            chrome_version=self._run.attrs.chrome_version)
        board_config = BoardConfig(board, builder_run.config.name)
        self.archive_stages[board_config] = archive_stage
        tasks.append((builder_run, board))

    # Set up a process pool to run test/archive stages in the background.
    # This process runs task(board) for each board added to the queue.
    task_runner = self._RunBackgroundStagesForBoardAndMarkAsSuccessful
    with parallel.BackgroundTaskRunner(task_runner) as queue:
      for builder_run, board in tasks:
        if not builder_run.config.build_packages_in_background:
          # Run BuildPackages in the foreground, generating or using AFDO data
          # if requested.
          kwargs = {'builder_run': builder_run}
          if builder_run.config.afdo_generate_min:
            kwargs['afdo_generate_min'] = True
          elif builder_run.config.afdo_use:
            kwargs['afdo_use'] = True

          self._RunStage(build_stages.BuildPackagesStage, board,
                         update_metadata=True, **kwargs)

          if (builder_run.config.afdo_generate_min and
              afdo.CanGenerateAFDOData(board)):
            # Generate the AFDO data before allowing any other tasks to run.
            self._RunStage(build_stages.BuildImageStage, board, **kwargs)
            self._RunStage(artifact_stages.UploadTestArtifactsStage, board,
                           builder_run=builder_run,
                           suffix='[afdo_generate_min]')
            suite = cbuildbot_config.AFDORecordTest()
            self._RunStage(test_stages.HWTestStage, board, suite,
                           builder_run=builder_run)
            self._RunStage(afdo_stages.AFDODataGenerateStage, board,
                           builder_run=builder_run)

          if (builder_run.config.afdo_generate_min and
              builder_run.config.afdo_update_ebuild):
            self._RunStage(afdo_stages.AFDOUpdateEbuildStage,
                           builder_run=builder_run)

        # Kick off our background stages.
        queue.put([builder_run, board])

  def RunStages(self):
    """Runs through build process."""
    # TODO(sosa): Split these out into classes.
    if self._run.config.build_type == constants.PRE_CQ_LAUNCHER_TYPE:
      self._RunStage(sync_stages.PreCQLauncherStage)
    elif ((self._run.config.build_type == constants.PALADIN_TYPE or
           self._run.config.build_type == constants.CHROME_PFQ_TYPE) and
          self._run.config.master):
      self._RunMasterPaladinOrChromePFQBuild()
    else:
      self._RunDefaultTypeBuild()


class DistributedBuilder(SimpleBuilder):
  """Build class that has special logic to handle distributed builds.

  These builds sync using git/manifest logic in manifest_versions.  In general
  they use a non-distributed builder code for the bulk of the work.
  """

  def __init__(self, *args, **kwargs):
    """Initializes a buildbot builder.

    Extra variables:
      completion_stage_class:  Stage used to complete a build.  Set in the Sync
        stage.
    """
    super(DistributedBuilder, self).__init__(*args, **kwargs)
    self.completion_stage_class = None
    self.sync_stage = None
    self._completion_stage = None

  def GetSyncInstance(self):
    """Syncs the tree using one of the distributed sync logic paths.

    Returns:
      The instance of the sync stage to run.
    """
    # Determine sync class to use.  CQ overrides PFQ bits so should check it
    # first.
    if self._run.config.pre_cq or self._run.options.pre_cq:
      sync_stage = self._GetStageInstance(sync_stages.PreCQSyncStage,
                                          self.patch_pool.gerrit_patches)
      self.completion_stage_class = completion_stages.PreCQCompletionStage
      self.patch_pool.gerrit_patches = []
    elif cbuildbot_config.IsCQType(self._run.config.build_type):
      if self._run.config.do_not_apply_cq_patches:
        sync_stage = self._GetStageInstance(
            sync_stages.MasterSlaveLKGMSyncStage)
      else:
        sync_stage = self._GetStageInstance(sync_stages.CommitQueueSyncStage)
      self.completion_stage_class = completion_stages.CommitQueueCompletionStage
    elif cbuildbot_config.IsPFQType(self._run.config.build_type):
      sync_stage = self._GetStageInstance(sync_stages.MasterSlaveLKGMSyncStage)
      self.completion_stage_class = (
          completion_stages.MasterSlaveSyncCompletionStage)
    elif cbuildbot_config.IsCanaryType(self._run.config.build_type):
      sync_stage = self._GetStageInstance(
          sync_stages.ManifestVersionedSyncStage)
      self.completion_stage_class = (
          completion_stages.CanaryCompletionStage)
    else:
      sync_stage = self._GetStageInstance(
          sync_stages.ManifestVersionedSyncStage)
      self.completion_stage_class = (
          completion_stages.ManifestVersionedSyncCompletionStage)

    self.sync_stage = sync_stage
    return self.sync_stage

  def GetCompletionInstance(self):
    """Returns the completion_stage_class instance that was used for this build.

    Returns:
      None if the completion_stage instance was not yet created (this
      occurs during Publish).
    """
    return self._completion_stage

  def Publish(self, was_build_successful, build_finished):
    """Completes build by publishing any required information.

    Args:
      was_build_successful: Whether the build succeeded.
      build_finished: Whether the build completed. A build can be successful
        without completing if it exits early with sys.exit(0).
    """
    completion_stage = self._GetStageInstance(self.completion_stage_class,
                                              self.sync_stage,
                                              was_build_successful)
    self._completion_stage = completion_stage
    completion_successful = False
    try:
      completion_stage.Run()
      completion_successful = True
      if (self._run.config.afdo_update_ebuild and
          not self._run.config.afdo_generate_min):
        self._RunStage(afdo_stages.AFDOUpdateEbuildStage)
    finally:
      if self._run.config.push_overlays:
        publish = (was_build_successful and completion_successful and
                   build_finished)
        self._RunStage(completion_stages.PublishUprevChangesStage, publish)

  def RunStages(self):
    """Runs simple builder logic and publishes information to overlays."""
    was_build_successful = False
    build_finished = False
    try:
      super(DistributedBuilder, self).RunStages()
      was_build_successful = results_lib.Results.BuildSucceededSoFar()
      build_finished = True
    except SystemExit as ex:
      # If a stage calls sys.exit(0), it's exiting with success, so that means
      # we should mark ourselves as successful.
      logging.info('Detected sys.exit(%s)', ex.code)
      if ex.code == 0:
        was_build_successful = True
      raise
    finally:
      self.Publish(was_build_successful, build_finished)