bootstat: Calculate and log the absolute device boot time.

  }

}

// Parses and records the set of bootloader stages and associated boot times

// from the ro.boot.boottime system property.

void RecordBootloaderTimings(BootEventRecordStore* boot_event_store) {

  // |ro.boot.boottime| is of the form 'stage1:time1,...,stageN:timeN'.

// A map from bootloader timing stage to the time that stage took during boot.

typedef std::map<std::string, int32_t> BootloaderTimingMap;

// Returns a mapping from bootloader stage names to the time those stages

// took to boot.

const BootloaderTimingMap GetBootLoaderTimings() {

  BootloaderTimingMap timings;

  // |ro.boot.boottime| is of the form 'stage1:time1,...,stageN:timeN',

  // where timeN is in milliseconds.

  std::string value = GetProperty("ro.boot.boottime");

  if (value.empty()) {

    // ro.boot.boottime is not reported on all devices.

    return;

    return BootloaderTimingMap();

  }

  int32_t total_time = 0;

  auto stages = android::base::Split(value, ",");

  for (auto const &stageTiming : stages) {

  for (const auto& stageTiming : stages) {

    // |stageTiming| is of the form 'stage:time'.

    auto stageTimingValues = android::base::Split(stageTiming, ":");

    DCHECK_EQ(2, stageTimingValues.size());

    std::string stageName = stageTimingValues[0];

    int32_t time_ms;

    if (android::base::ParseInt(stageTimingValues[1], &time_ms)) {

      total_time += time_ms;

      boot_event_store->AddBootEventWithValue(

          "boottime.bootloader." + stageName, time_ms);

      timings[stageName] = time_ms;

    }

  }

  return timings;

}

// Parses and records the set of bootloader stages and associated boot times

// from the ro.boot.boottime system property.

void RecordBootloaderTimings(BootEventRecordStore* boot_event_store,

                             const BootloaderTimingMap& bootloader_timings) {

  int32_t total_time = 0;

  for (const auto& timing : bootloader_timings) {

    total_time += timing.second;

    boot_event_store->AddBootEventWithValue("boottime.bootloader." + timing.first, timing.second);

  }

  boot_event_store->AddBootEventWithValue("boottime.bootloader.total", total_time);

}

// Records the closest estimation to the absolute device boot time, i.e.,

// from power on to boot_complete, including bootloader times.

void RecordAbsoluteBootTime(BootEventRecordStore* boot_event_store,

                            const BootloaderTimingMap& bootloader_timings,

                            std::chrono::milliseconds uptime) {

  int32_t bootloader_time_ms = 0;

  for (const auto& timing : bootloader_timings) {

    if (timing.first.compare("SW") != 0) {

      bootloader_time_ms += timing.second;

    }

  }

  auto bootloader_duration = std::chrono::milliseconds(bootloader_time_ms);

  auto absolute_total =

      std::chrono::duration_cast<std::chrono::seconds>(bootloader_duration + uptime);

  boot_event_store->AddBootEventWithValue("absolute_boot_time", absolute_total.count());

}

// Records several metrics related to the time it takes to boot the device,

// including disambiguating boot time on encrypted or non-encrypted devices.

void RecordBootComplete() {

  BootEventRecordStore boot_event_store;

  BootEventRecordStore::BootEventRecord record;

  auto uptime = std::chrono::duration_cast<std::chrono::seconds>(

      android::base::boot_clock::now().time_since_epoch());

  auto time_since_epoch = android::base::boot_clock::now().time_since_epoch();

  auto uptime = std::chrono::duration_cast<std::chrono::seconds>(time_since_epoch);

  time_t current_time_utc = time(nullptr);

  if (boot_event_store.GetBootEvent("last_boot_time_utc", &record)) {

    std::chrono::seconds boot_complete = std::chrono::seconds(uptime.count() - record.second);

    boot_event_store.AddBootEventWithValue(boot_complete_prefix + "_post_decrypt",

                                           boot_complete.count());

  } else {

      boot_event_store.AddBootEventWithValue(boot_complete_prefix + "_no_encryption",

                                             uptime.count());

  RecordInitBootTimeProp(&boot_event_store, "ro.boottime.init.selinux");

  RecordInitBootTimeProp(&boot_event_store, "ro.boottime.init.cold_boot_wait");

  RecordBootloaderTimings(&boot_event_store);

  const BootloaderTimingMap bootloader_timings = GetBootLoaderTimings();

  RecordBootloaderTimings(&boot_event_store, bootloader_timings);

  auto uptime_ms = std::chrono::duration_cast<std::chrono::milliseconds>(time_since_epoch);

  RecordAbsoluteBootTime(&boot_event_store, bootloader_timings, uptime_ms);

}

// Records the boot_reason metric by querying the ro.boot.bootreason system