update_engine/update_attempter_nestlabs.cc

//
// Copyright (C) 2012 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#include "update_engine/update_attempter_nestlabs.h"

#include <stdint.h>

#include <algorithm>
#include <memory>
#include <set>
#include <string>
#include <utility>
#include <vector>

#include <base/bind.h>
#include <base/files/file_util.h>
#include <base/logging.h>
#include <base/rand_util.h>
#include <base/strings/string_util.h>
#include <base/strings/stringprintf.h>
#include <brillo/bind_lambda.h>
#include <brillo/errors/error_codes.h>
#include <brillo/make_unique_ptr.h>
#include <brillo/message_loops/message_loop.h>
#include <policy/device_policy.h>
#include <policy/libpolicy.h>
#include <update_engine/dbus-constants-nestlabs.h>

#include "update_engine/certificate_checker.h"
#include "update_engine/common/boot_control_interface.h"
#include "update_engine/common/clock_interface.h"
#include "update_engine/common/constants.h"
#include "update_engine/common/hardware_interface.h"
#include "update_engine/common/multi_range_http_fetcher.h"
#include "update_engine/common/platform_constants.h"
#include "update_engine/common/prefs_interface.h"
#include "update_engine/common/subprocess.h"
#include "update_engine/common/utils.h"
#include "update_engine/libcurl_http_fetcher.h"
#include "update_engine/metrics.h"
#include "update_engine/payload_properties_request_action.h"
#include "update_engine/payload_properties_handler_action.h"
#include "update_engine/p2p_manager.h"
#include "update_engine/payload_consumer/download_action.h"
#include "update_engine/payload_consumer/filesystem_verifier_action.h"
#include "update_engine/payload_consumer/postinstall_runner_action.h"
#include "update_engine/payload_state_interface.h"
#include "update_engine/power_manager_interface.h"
#include "update_engine/system_state.h"
#include "update_engine/update_manager/policy.h"
#include "update_engine/update_manager/update_manager.h"
#include "update_engine/update_status_utils.h"

#define PAYLOAD_PROPERTIES_OFFSET 0
#define PAYLOAD_PROPERTIES_SIZE 512


using base::Bind;
using base::Callback;
using base::Time;
using base::TimeDelta;
using base::TimeTicks;
using brillo::MessageLoop;
using chromeos_update_manager::EvalStatus;
using chromeos_update_manager::Policy;
using chromeos_update_manager::UpdateCheckParams;
using std::set;
using std::shared_ptr;
using std::string;
using std::vector;

namespace chromeos_update_engine {

const int UpdateAttempter::kMaxDeltaUpdateFailures = 3;

namespace {
// Minimum threshold to broadcast an status update in progress and time.
const double kBroadcastThresholdProgress = 0.01;  // 1%
const int kBroadcastThresholdSeconds = 10;
}  // namespace

UpdateAttempter::UpdateAttempter(SystemState* system_state,
                                 CertificateChecker* cert_checker,
                                 LibCrosProxy* libcros_proxy)
    : processor_(new ActionProcessor()),
      system_state_(system_state),
      cert_checker_(cert_checker) {
}

UpdateAttempter::~UpdateAttempter() {
  // CertificateChecker might not be initialized in unittests.
  if (cert_checker_)
    cert_checker_->SetObserver(nullptr);
  // Release ourselves as the ActionProcessor's delegate to prevent
  // re-scheduling the updates due to the processing stopped.
  processor_->set_delegate(nullptr);
}

void UpdateAttempter::Init() {
  // Pulling from the SystemState can only be done after construction, since
  // this is an aggregate of various objects (such as the UpdateAttempter),
  // which requires them all to be constructed prior to it being used.
  prefs_ = system_state_->prefs();
  //omaha_request_params_ = system_state_->request_params();

  if (cert_checker_)
    cert_checker_->SetObserver(this);

  // In case of update_engine restart without a reboot we need to restore the
  // reboot needed state.
  if (GetBootTimeAtUpdate(nullptr))
    status_ = UpdateStatus::UPDATED_NEED_REBOOT;
  else
    status_ = UpdateStatus::IDLE;
}

void UpdateAttempter::ScheduleUpdates() {
  if (IsUpdateRunningOrScheduled())
    return;

  chromeos_update_manager::UpdateManager* const update_manager =
      system_state_->update_manager();
  CHECK(update_manager);
  Callback<void(EvalStatus, const UpdateCheckParams&)> callback = Bind(
      &UpdateAttempter::OnUpdateScheduled, base::Unretained(this));
  // We limit the async policy request to a reasonably short time, to avoid a
  // starvation due to a transient bug.
  update_manager->AsyncPolicyRequest(callback, &Policy::UpdateCheckAllowed);
  waiting_for_scheduled_check_ = true;
}

void UpdateAttempter::CertificateChecked(ServerToCheck server_to_check,
                                         CertificateCheckResult result) {
  metrics::ReportCertificateCheckMetrics(system_state_,
                                         server_to_check,
                                         result);
}

void UpdateAttempter::Update(const string& app_version,
                             const string& url,
                             const string& target_channel,
                             const string& target_version_prefix,
                             bool obey_proxies,
                             bool interactive) {

  // Notify of the new update attempt, clearing prior interactive requests.
  if (forced_update_pending_callback_.get())
    forced_update_pending_callback_->Run(false, false);

  if (status_ == UpdateStatus::UPDATED_NEED_REBOOT) {
    // Although we have applied an update, we still want to ping Omaha
    // to ensure the number of active statistics is accurate.
    //
    // Also convey to the UpdateEngine.Check.Result metric that we're
    // not performing an update check because of this.
    LOG(INFO) << "Not updating b/c we already updated and we're waiting for reboot";
    metrics::ReportUpdateCheckMetrics(system_state_,
                                      metrics::CheckResult::kRebootPending,
                                      metrics::CheckReaction::kUnset,
                                      metrics::DownloadErrorCode::kUnset);
    return;
  }
  if (status_ != UpdateStatus::IDLE) {
    // Update in progress. Do nothing
    return;
  }

  // Update the last check time here; it may be re-updated when an Omaha
  // response is received, but this will prevent us from repeatedly scheduling
  // checks in the case where a response is not received.
  UpdateLastCheckedTime();

  if (!CalculateUpdateParams(app_version ,url)) {
    return;
  }

  BuildUpdateActions(interactive);

  SetStatusAndNotify(UpdateStatus::CHECKING_FOR_UPDATE);

  // Just in case we didn't update boot flags yet, make sure they're updated
  // before any update processing starts.
  start_action_processor_ = true;
  UpdateBootFlags();
}

bool UpdateAttempter::CalculateUpdateParams(const string& version,
                                            const string& url) {

  PayloadStateInterface* const payload_state = system_state_->payload_state();

  // Refresh the policy before computing all the update parameters.
  RefreshDevicePolicy();

  payload_properties_.payload_urls.clear();

  // Skip update if `url' is empty (update_engine was not asked for update via DBUS),
  // and URL from payload_state is empty (there is no restored URL
  // from previos update)
  if (url != "")
  {
    payload_properties_.payload_urls.push_back(url);
  }
  else if (payload_state->GetCurrentUrl() != "")
  {
    payload_properties_.payload_urls.push_back(payload_state->GetCurrentUrl());
  }
  else
  {
    LOG(INFO)
        << "URL is not present. Nothing to do now. retrying.";
    ScheduleUpdates();
    return false;
  }

  // turn P2P off
  payload_state->SetUsingP2PForDownloading(false);
  payload_state->SetUsingP2PForSharing(false);

  // reset code
  http_response_code_ = 0;

  return true;
}

void UpdateAttempter::RefreshDevicePolicy() {
  // Lazy initialize the policy provider, or reload the latest policy data.
  if (!policy_provider_.get())
    policy_provider_.reset(new policy::PolicyProvider());
  policy_provider_->Reload();

  const policy::DevicePolicy* device_policy = nullptr;
  if (policy_provider_->device_policy_is_loaded())
    device_policy = &policy_provider_->GetDevicePolicy();

  if (device_policy)
    LOG(INFO) << "Device policies/settings present";
  else
    LOG(INFO) << "No device policies/settings present.";

  system_state_->set_device_policy(device_policy);
  system_state_->p2p_manager()->SetDevicePolicy(device_policy);
}

void UpdateAttempter::BuildPostInstallActions(
    InstallPlanAction* previous_action) {
  shared_ptr<PostinstallRunnerAction> postinstall_runner_action(
      new PostinstallRunnerAction(system_state_->boot_control(),
                                  system_state_->hardware()));
  postinstall_runner_action->set_delegate(this);
  actions_.push_back(shared_ptr<AbstractAction>(postinstall_runner_action));
  BondActions(previous_action,
              postinstall_runner_action.get());
}

#define MAX_RETRIES 3

void UpdateAttempter::BuildUpdateActions(bool interactive) {
  CHECK(!processor_->IsRunning());
  processor_->set_delegate(this);

  // Actions:
  LibcurlHttpFetcher * pp_base_fetcher =
      new LibcurlHttpFetcher(GetProxyResolver(), system_state_->hardware());
  MultiRangeHttpFetcher * payload_properties_fetcher =
      new MultiRangeHttpFetcher(pp_base_fetcher);

  pp_base_fetcher->set_server_to_check(ServerToCheck::kDownload);
  pp_base_fetcher->set_no_network_max_retries(MAX_RETRIES);
  payload_properties_fetcher->AddRange(PAYLOAD_PROPERTIES_OFFSET, PAYLOAD_PROPERTIES_SIZE);
  shared_ptr<PayloadPropertiesRequestAction> payload_properties_request_action(
      new PayloadPropertiesRequestAction(system_state_,
                             &payload_properties_,
                             (LibcurlHttpFetcher *)payload_properties_fetcher));
  payload_properties_request_action_ = payload_properties_request_action;

  shared_ptr<PayloadPropertiesHandlerAction> payload_properties_handler_action(
      new PayloadPropertiesHandlerAction(system_state_));
  payload_properties_handler_action_ = payload_properties_handler_action;

  LibcurlHttpFetcher* download_fetcher =
      new LibcurlHttpFetcher(GetProxyResolver(), system_state_->hardware());
  download_fetcher->set_server_to_check(ServerToCheck::kDownload);
  shared_ptr<DownloadAction> download_action(new DownloadAction(
      prefs_,
      system_state_->boot_control(),
      system_state_->hardware(),
      system_state_,
      new MultiRangeHttpFetcher(download_fetcher)));  // passes ownership
  download_action->set_delegate(this);
  download_action_ = download_action;

  shared_ptr<FilesystemVerifierAction> filesystem_verifier_action(
      new FilesystemVerifierAction());

  actions_.push_back(shared_ptr<AbstractAction>(payload_properties_request_action));
  actions_.push_back(shared_ptr<AbstractAction>(payload_properties_handler_action));
  actions_.push_back(shared_ptr<AbstractAction>(download_action));
  actions_.push_back(shared_ptr<AbstractAction>(filesystem_verifier_action));

  // Bond them together. We have to use the leaf-types when calling
  // BondActions().
  BondActions(payload_properties_request_action.get(),
              payload_properties_handler_action.get());
  BondActions(payload_properties_handler_action.get(),
              download_action.get());
  BondActions(download_action.get(),
              filesystem_verifier_action.get());
  BuildPostInstallActions(filesystem_verifier_action.get());

  // Enqueue the actions
  for (const shared_ptr<AbstractAction>& action : actions_) {
    processor_->EnqueueAction(action.get());
  }
}

bool UpdateAttempter::Rollback(bool powerwash) {
  if (!CanRollback()) {
    return false;
  }

  processor_->set_delegate(this);

  LOG(INFO) << "Setting rollback options.";
  InstallPlan install_plan;

  install_plan.target_slot = GetRollbackSlot();
  install_plan.source_slot = system_state_->boot_control()->GetCurrentSlot();

  TEST_AND_RETURN_FALSE(
      install_plan.LoadPartitionsFromSlots(system_state_->boot_control()));
  install_plan.powerwash_required = powerwash;

  LOG(INFO) << "Using this install plan:";
  install_plan.Dump();

  shared_ptr<InstallPlanAction> install_plan_action(
      new InstallPlanAction(install_plan));
  actions_.push_back(shared_ptr<AbstractAction>(install_plan_action));

  BuildPostInstallActions(install_plan_action.get());

  // Enqueue the actions
  for (const shared_ptr<AbstractAction>& action : actions_) {
    processor_->EnqueueAction(action.get());
  }

  // Update the payload state for Rollback.
  system_state_->payload_state()->Rollback();

  SetStatusAndNotify(UpdateStatus::ATTEMPTING_ROLLBACK);

  // Just in case we didn't update boot flags yet, make sure they're updated
  // before any update processing starts. This also schedules the start of the
  // actions we just posted.
  start_action_processor_ = true;
  UpdateBootFlags();
  return true;
}

bool UpdateAttempter::CanRollback() const {
  // We can only rollback if the update_engine isn't busy and we have a valid
  // rollback partition.
  return (status_ == UpdateStatus::IDLE &&
          GetRollbackSlot() != BootControlInterface::kInvalidSlot);
}

BootControlInterface::Slot UpdateAttempter::GetRollbackSlot() const {
  LOG(INFO) << "UpdateAttempter::GetRollbackSlot";
  const unsigned int num_slots = system_state_->boot_control()->GetNumSlots();
  const BootControlInterface::Slot current_slot =
      system_state_->boot_control()->GetCurrentSlot();

  LOG(INFO) << "  Installed slots: " << num_slots;
  LOG(INFO) << "  Booted from slot: "
            << BootControlInterface::SlotName(current_slot);

  if (current_slot == BootControlInterface::kInvalidSlot || num_slots < 2) {
    LOG(INFO) << "Device is not updateable.";
    return BootControlInterface::kInvalidSlot;
  }

  vector<BootControlInterface::Slot> bootable_slots;
  for (BootControlInterface::Slot slot = 0; slot < num_slots; slot++) {
    if (slot != current_slot &&
        system_state_->boot_control()->IsSlotBootable(slot)) {
      LOG(INFO) << "Found bootable slot "
                << BootControlInterface::SlotName(slot);
      return slot;
    }
  }
  LOG(INFO) << "No other bootable slot found.";
  return BootControlInterface::kInvalidSlot;
}

void UpdateAttempter::CheckForUpdate(const string& app_version,
                                     const string& url,
                                     bool interactive) {
  LOG(INFO) << "Update requested.";
  app_version_ = app_version;
  url_ = url;

  if (forced_update_pending_callback_.get()) {
    // Make sure that a scheduling request is made prior to calling the forced
    // update pending callback.
    ScheduleUpdates();
    forced_update_pending_callback_->Run(true, interactive);
  }
}

bool UpdateAttempter::RebootIfNeeded() {
  if (status_ != UpdateStatus::UPDATED_NEED_REBOOT) {
    LOG(INFO) << "Reboot requested, but status is "
              << UpdateStatusToString(status_) << ", so not rebooting.";
    return false;
  }

  if (system_state_->power_manager()->RequestReboot())
    return true;

  return RebootDirectly();
}

void UpdateAttempter::WriteUpdateCompletedMarker() {
  string boot_id;
  if (!utils::GetBootId(&boot_id))
    return;
  prefs_->SetString(kPrefsUpdateCompletedOnBootId, boot_id);

  int64_t value = system_state_->clock()->GetBootTime().ToInternalValue();
  prefs_->SetInt64(kPrefsUpdateCompletedBootTime, value);
}

bool UpdateAttempter::RebootDirectly() {
  vector<string> command;
  command.push_back("/system/bin/reboot");
  LOG(INFO) << "Running \"" << base::JoinString(command, " ") << "\"";
  int rc = 0;
  Subprocess::SynchronousExec(command, &rc, nullptr);
  return rc == 0;
}

void UpdateAttempter::OnUpdateScheduled(EvalStatus status,
                                        const UpdateCheckParams& params) {
  waiting_for_scheduled_check_ = false;

  if (status == EvalStatus::kSucceeded) {
    if (!params.updates_enabled) {
      LOG(WARNING) << "Updates permanently disabled.";
      // Signal disabled status, then switch right back to idle. This is
      // necessary for ensuring that observers waiting for a signal change will
      // actually notice one on subsequent calls. Note that we don't need to
      // re-schedule a check in this case as updates are permanently disabled;
      // further (forced) checks may still initiate a scheduling call.
      SetStatusAndNotify(UpdateStatus::DISABLED);
      SetStatusAndNotify(UpdateStatus::IDLE);
      return;
    }

    LOG(INFO) << "Running update.";

    Update(app_version_, url_);
    // Always clear the forced app_version and url after an update attempt
    // so the next update uses the defaults.
    app_version_.clear();
    url_.clear();
  } else {
    LOG(WARNING)
        << "Update check scheduling failed (possibly timed out); retrying.";
    ScheduleUpdates();
  }

  // This check ensures that future update checks will be or are already
  // scheduled. The check should never fail. A check failure means that there's
  // a bug that will most likely prevent further automatic update checks. It
  // seems better to crash in such cases and restart the update_engine daemon
  // into, hopefully, a known good state.
  CHECK(IsUpdateRunningOrScheduled());
}

void UpdateAttempter::UpdateLastCheckedTime() {
  last_checked_time_ = system_state_->clock()->GetWallclockTime().ToTimeT();
}

// Delegate methods:
void UpdateAttempter::ProcessingDone(const ActionProcessor* processor,
                                     ErrorCode code) {
  LOG(INFO) << "Processing Done.";
  actions_.clear();

  // Reset cpu shares back to normal.
  cpu_limiter_.StopLimiter();

  if (code != ErrorCode::kSuccess) {
      // update metrics
      system_state_->payload_state()->UpdateFailed(code);
      DeltaPerformer::ResetUpdateProgress(prefs_, false);
      // send ERROR event and go into IDLE state otherwise update_engine
      // will not able to handle other requests
      // REPORTING_ERROR_EVENT is recoverable state which is used just for
      // notifying about error.
      SetStatusAndNotify(UpdateStatus::REPORTING_ERROR_EVENT);
      // go back to IDLE
      SetStatusAndNotify(UpdateStatus::IDLE);
      ScheduleUpdates();
      return;
  }

  WriteUpdateCompletedMarker();
  prefs_->SetInt64(kPrefsDeltaUpdateFailures, 0);
  prefs_->SetString(kPrefsPreviousVersion,
                    payload_properties_.version);
  DeltaPerformer::ResetUpdateProgress(prefs_, false);

  system_state_->payload_state()->UpdateSucceeded();

  // Since we're done with scattering fully at this point, this is the
  // safest point delete the state files, as we're sure that the status is
  // set to reboot (which means no more updates will be applied until reboot)
  // This deletion is required for correctness as we want the next update
  // check to re-create a new random number for the update check count.
  // Similarly, we also delete the wall-clock-wait period that was persisted
  // so that we start with a new random value for the next update check
  // after reboot so that the same device is not favored or punished in any
  // way.
  prefs_->Delete(kPrefsUpdateCheckCount);
  system_state_->payload_state()->SetScatteringWaitPeriod(TimeDelta());
  prefs_->Delete(kPrefsUpdateFirstSeenAt);

  SetStatusAndNotify(UpdateStatus::UPDATED_NEED_REBOOT);
  LOG(INFO) << "Update successfully applied, waiting to reboot.";
  return;
}

void UpdateAttempter::ProcessingStopped(const ActionProcessor* processor) {
  // Reset cpu shares back to normal.
  cpu_limiter_.StopLimiter();
  download_progress_ = 0.0;
  SetStatusAndNotify(UpdateStatus::IDLE);
  ScheduleUpdates();
  actions_.clear();
}

// Called whenever an action has finished processing, either successfully
// or otherwise.
void UpdateAttempter::ActionCompleted(ActionProcessor* processor,
                                      AbstractAction* action,
                                      ErrorCode code) {
  const string type = action->Type();

  // Reset download progress regardless of whether or not the download
  // action succeeded. Also, get the response code from HTTP request
  // actions (update download as well as the initial update check
  // actions).
  if (type == DownloadAction::StaticType()) {
    download_progress_ = 0.0;
    http_response_code_ = download_action_->GetHTTPResponseCode();
  }
  else if (type == PayloadPropertiesRequestAction::StaticType())
  {
    http_response_code_ = payload_properties_request_action_->GetHTTPResponseCode();
  }
  if (code != ErrorCode::kSuccess) {
    // If the current state is at or past the download phase, count the failure
    // in case a switch to full update becomes necessary. Ignore network
    // transfer timeouts and failures.
    if (status_ >= UpdateStatus::DOWNLOADING &&
        code != ErrorCode::kDownloadTransferError) {
      MarkDeltaUpdateFailure();
    }
    return;
  }

  if (type == PayloadPropertiesHandlerAction::StaticType()) {
    // Note that the status will be updated to DOWNLOADING when some bytes get
    // actually downloaded from the server and the BytesReceived callback is
    // invoked. This avoids notifying the user that a download has started in
    // cases when the server and the client are unable to initiate the download.
    CHECK(action == payload_properties_handler_action_.get());
    const InstallPlan& plan = payload_properties_handler_action_->install_plan();
    UpdateLastCheckedTime();
    new_version_ = plan.version;
    new_payload_size_ = plan.payload_size;
    SetupDownload();
    cpu_limiter_.StartLimiter();
    SetStatusAndNotify(UpdateStatus::UPDATE_AVAILABLE);
  } else if (type == DownloadAction::StaticType()) {
    SetStatusAndNotify(UpdateStatus::FINALIZING);
  }
}

void UpdateAttempter::BytesReceived(uint64_t bytes_progressed,
                                    uint64_t bytes_received,
                                    uint64_t total) {
  // The PayloadState keeps track of how many bytes were actually downloaded
  // from a given URL for the URL skipping logic.
  system_state_->payload_state()->DownloadProgress(bytes_progressed);

  double progress = 0;
  if (total)
    progress = static_cast<double>(bytes_received) / static_cast<double>(total);
  if (status_ != UpdateStatus::DOWNLOADING || bytes_received == total) {
    download_progress_ = progress;
    SetStatusAndNotify(UpdateStatus::DOWNLOADING);
  } else {
    ProgressUpdate(progress);
  }
}

void UpdateAttempter::DownloadComplete() {
  system_state_->payload_state()->DownloadComplete();
}

void UpdateAttempter::ProgressUpdate(double progress) {
  // Self throttle based on progress. Also send notifications if progress is
  // too slow.
  if (progress == 1.0 ||
      progress - download_progress_ >= kBroadcastThresholdProgress ||
      TimeTicks::Now() - last_notify_time_ >=
          TimeDelta::FromSeconds(kBroadcastThresholdSeconds)) {
    download_progress_ = progress;
    BroadcastStatus();
  }
}

bool UpdateAttempter::ResetStatus() {
  LOG(INFO) << "Attempting to reset state from "
            << UpdateStatusToString(status_) << " to UpdateStatus::IDLE";

  switch (status_) {
    case UpdateStatus::IDLE:
      // no-op.
      return true;

    case UpdateStatus::UPDATED_NEED_REBOOT:  {
      bool ret_value = true;
      status_ = UpdateStatus::IDLE;

      // Remove the reboot marker so that if the machine is rebooted
      // after resetting to idle state, it doesn't go back to
      // UpdateStatus::UPDATED_NEED_REBOOT state.
      ret_value = prefs_->Delete(kPrefsUpdateCompletedOnBootId) && ret_value;
      ret_value = prefs_->Delete(kPrefsUpdateCompletedBootTime) && ret_value;

      // Update the boot flags so the current slot has higher priority.
      BootControlInterface* boot_control = system_state_->boot_control();
      if (!boot_control->SetActiveBootSlot(boot_control->GetCurrentSlot()))
        ret_value = false;

      // Notify the PayloadState that the successful payload was canceled.
      system_state_->payload_state()->ResetUpdateStatus();

      // The previous version is used to report back to omaha after reboot that
      // we actually rebooted into the new version from this "prev-version". We
      // need to clear out this value now to prevent it being sent on the next
      // updatecheck request.
      ret_value = prefs_->SetString(kPrefsPreviousVersion, "") && ret_value;

      LOG(INFO) << "Reset status " << (ret_value ? "successful" : "failed");
      return ret_value;
    }

    default:
      LOG(ERROR) << "Reset not allowed in this state.";
      return false;
  }
}

bool UpdateAttempter::GetStatus(int64_t* last_checked_time,
                                double* progress,
                                string* current_operation,
                                string* new_version,
                                int64_t* new_payload_size) {
  *last_checked_time = last_checked_time_;
  *progress = download_progress_;
  *current_operation = UpdateStatusToString(status_);
  *new_version = new_version_;
  *new_payload_size = new_payload_size_;
  return true;
}

void UpdateAttempter::UpdateBootFlags() {
  if (update_boot_flags_running_) {
    LOG(INFO) << "Update boot flags running, nothing to do.";
    return;
  }
  if (updated_boot_flags_) {
    LOG(INFO) << "Already updated boot flags. Skipping.";
    if (start_action_processor_) {
      ScheduleProcessingStart();
    }
    return;
  }
  // This is purely best effort. Failures should be logged by Subprocess. Run
  // the script asynchronously to avoid blocking the event loop regardless of
  // the script runtime.
  update_boot_flags_running_ = true;
  LOG(INFO) << "Marking booted slot as good.";
  if (!system_state_->boot_control()->MarkBootSuccessfulAsync(Bind(
          &UpdateAttempter::CompleteUpdateBootFlags, base::Unretained(this)))) {
    LOG(ERROR) << "Failed to mark current boot as successful.";
    CompleteUpdateBootFlags(false);
  }
}

void UpdateAttempter::CompleteUpdateBootFlags(bool successful) {
  update_boot_flags_running_ = false;
  updated_boot_flags_ = true;
  if (start_action_processor_) {
    ScheduleProcessingStart();
  }
}

void UpdateAttempter::BroadcastStatus() {
  for (const auto& observer : service_observers_) {
    observer->SendStatusUpdate(last_checked_time_,
                               download_progress_,
                               status_,
                               new_version_,
                               new_payload_size_);
  }
  last_notify_time_ = TimeTicks::Now();
}

void UpdateAttempter::SetStatusAndNotify(UpdateStatus status) {
  status_ = status;
  BroadcastStatus();
}

void UpdateAttempter::ScheduleProcessingStart() {
  LOG(INFO) << "Scheduling an action processor start.";
  start_action_processor_ = false;
  MessageLoop::current()->PostTask(
      FROM_HERE,
      Bind([](ActionProcessor* processor) { processor->StartProcessing(); },
           base::Unretained(processor_.get())));
}

void UpdateAttempter::MarkDeltaUpdateFailure() {
  // Don't try to resume a failed delta update.
  DeltaPerformer::ResetUpdateProgress(prefs_, false);
  int64_t delta_failures;
  if (!prefs_->GetInt64(kPrefsDeltaUpdateFailures, &delta_failures) ||
      delta_failures < 0) {
    delta_failures = 0;
  }
  prefs_->SetInt64(kPrefsDeltaUpdateFailures, ++delta_failures);
}

void UpdateAttempter::SetupDownload() {
  MultiRangeHttpFetcher* fetcher =
      static_cast<MultiRangeHttpFetcher*>(download_action_->http_fetcher());
  fetcher->ClearRanges();
  //if (response_handler_action_->install_plan().is_resume) {
  if (payload_properties_handler_action_->install_plan().is_resume) {
    // Resuming an update so fetch the update manifest metadata first.
    int64_t manifest_metadata_size = 0;
    int64_t manifest_signature_size = 0;
    prefs_->GetInt64(kPrefsManifestMetadataSize, &manifest_metadata_size);
    prefs_->GetInt64(kPrefsManifestSignatureSize, &manifest_signature_size);
    fetcher->AddRange(PAYLOAD_PROPERTIES_SIZE, manifest_metadata_size + manifest_signature_size);
    // If there're remaining unprocessed data blobs, fetch them. Be careful not
    // to request data beyond the end of the payload to avoid 416 HTTP response
    // error codes.
    int64_t next_data_offset = 0;
    prefs_->GetInt64(kPrefsUpdateStateNextDataOffset, &next_data_offset);
    uint64_t resume_offset =
        manifest_metadata_size + manifest_signature_size + next_data_offset;
    if (resume_offset < payload_properties_handler_action_->install_plan().payload_size) {
      fetcher->AddRange(resume_offset);
    }
  } else {
    fetcher->AddRange(PAYLOAD_PROPERTIES_SIZE);
  }
}


void UpdateAttempter::UpdateEngineStarted() {
  // If we just booted into a new update, keep the previous OS version
  // in case we rebooted because of a crash of the old version, so we
  // can do a proper crash report with correct information.
  // This must be done before calling
  // system_state_->payload_state()->UpdateEngineStarted() since it will
  // delete SystemUpdated marker file.
  if (system_state_->system_rebooted() &&
      prefs_->Exists(kPrefsSystemUpdatedMarker)) {
    if (!prefs_->GetString(kPrefsPreviousVersion, &prev_version_)) {
      // If we fail to get the version string, make sure it stays empty.
      prev_version_.clear();
    }
  }

  system_state_->payload_state()->UpdateEngineStarted();
}

bool UpdateAttempter::GetBootTimeAtUpdate(Time *out_boot_time) {
  // In case of an update_engine restart without a reboot, we stored the boot_id
  // when the update was completed by setting a pref, so we can check whether
  // the last update was on this boot or a previous one.
  string boot_id;
  TEST_AND_RETURN_FALSE(utils::GetBootId(&boot_id));

  string update_completed_on_boot_id;
  if (!prefs_->Exists(kPrefsUpdateCompletedOnBootId) ||
      !prefs_->GetString(kPrefsUpdateCompletedOnBootId,
                         &update_completed_on_boot_id) ||
      update_completed_on_boot_id != boot_id)
    return false;

  // Short-circuit avoiding the read in case out_boot_time is nullptr.
  if (out_boot_time) {
    int64_t boot_time = 0;
    // Since the kPrefsUpdateCompletedOnBootId was correctly set, this pref
    // should not fail.
    TEST_AND_RETURN_FALSE(
        prefs_->GetInt64(kPrefsUpdateCompletedBootTime, &boot_time));
    *out_boot_time = Time::FromInternalValue(boot_time);
  }
  return true;
}

bool UpdateAttempter::IsUpdateRunningOrScheduled() {
  return ((status_ != UpdateStatus::IDLE &&
           status_ != UpdateStatus::UPDATED_NEED_REBOOT) ||
          waiting_for_scheduled_check_);
}

}  // namespace chromeos_update_engine