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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/policy/device_status_collector.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/string_number_conversions.h"
#include "chrome/browser/chromeos/system/statistics_provider.h"
#include "chrome/browser/policy/proto/device_management_backend.pb.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/prefs/scoped_user_pref_update.h"
#include "chrome/common/chrome_version_info.h"
using base::Time;
using base::TimeDelta;
using chromeos::VersionLoader;
namespace em = enterprise_management;
namespace {
// How many seconds of inactivity triggers the idle state.
const unsigned int kIdleStateThresholdSeconds = 300;
// The maximum number of time periods stored in the local state.
const unsigned int kMaxStoredActivePeriods = 500;
// Stores the baseline timestamp, to which the active periods are relative.
const char* const kPrefBaselineTime = "device_status.baseline_timestamp";
// Stores a list of timestamps representing device active periods.
const char* const kPrefDeviceActivePeriods = "device_status.active_periods";
bool GetTimestamp(const ListValue* list, int index, int64* out_value) {
std::string string_value;
if (list->GetString(index, &string_value))
return base::StringToInt64(string_value, out_value);
return false;
}
} // namespace
namespace policy {
DeviceStatusCollector::DeviceStatusCollector(
PrefService* local_state,
chromeos::system::StatisticsProvider* provider)
: max_stored_active_periods_(kMaxStoredActivePeriods),
local_state_(local_state),
last_idle_check_(Time()),
last_idle_state_(IDLE_STATE_UNKNOWN),
statistics_provider_(provider) {
timer_.Start(FROM_HERE,
TimeDelta::FromSeconds(
DeviceStatusCollector::kPollIntervalSeconds),
this, &DeviceStatusCollector::CheckIdleState);
// Get the the OS and firmware version info.
version_loader_.GetVersion(&consumer_,
base::Bind(&DeviceStatusCollector::OnOSVersion,
base::Unretained(this)),
VersionLoader::VERSION_FULL);
version_loader_.GetFirmware(&consumer_,
base::Bind(&DeviceStatusCollector::OnOSFirmware,
base::Unretained(this)));
}
DeviceStatusCollector::~DeviceStatusCollector() {
}
// static
void DeviceStatusCollector::RegisterPrefs(PrefService* local_state) {
local_state->RegisterInt64Pref(kPrefBaselineTime, Time::Now().ToTimeT());
local_state->RegisterListPref(kPrefDeviceActivePeriods, new ListValue);
}
void DeviceStatusCollector::CheckIdleState() {
CalculateIdleState(kIdleStateThresholdSeconds,
base::Bind(&DeviceStatusCollector::IdleStateCallback,
base::Unretained(this)));
}
Time DeviceStatusCollector::GetCurrentTime() {
return Time::Now();
}
void DeviceStatusCollector::AddActivePeriod(Time start, Time end) {
// Maintain the list of active periods in a local_state pref.
ListPrefUpdate update(local_state_, kPrefDeviceActivePeriods);
ListValue* active_periods = update.Get();
// Cap the number of active periods that we store.
if (active_periods->GetSize() >= 2 * max_stored_active_periods_)
return;
Time epoch = Time::UnixEpoch();
int64 start_timestamp = (start - epoch).InMilliseconds();
Value* end_value = new StringValue(
base::Int64ToString((end - epoch).InMilliseconds()));
int list_size = active_periods->GetSize();
DCHECK(list_size % 2 == 0);
// Check if this period can be combined with the previous one.
if (list_size > 0 && last_idle_state_ == IDLE_STATE_ACTIVE) {
int64 last_period_end;
if (GetTimestamp(active_periods, list_size - 1, &last_period_end) &&
last_period_end == start_timestamp) {
active_periods->Set(list_size - 1, end_value);
return;
}
}
// Add a new period to the list.
active_periods->Append(
new StringValue(base::Int64ToString(start_timestamp)));
active_periods->Append(end_value);
}
void DeviceStatusCollector::IdleStateCallback(IdleState state) {
Time now = GetCurrentTime();
if (state == IDLE_STATE_ACTIVE) {
unsigned int poll_interval = DeviceStatusCollector::kPollIntervalSeconds;
// If it's been too long since the last report, assume that the system was
// in standby, and only count a single interval of activity.
if ((now - last_idle_check_).InSeconds() >= (2 * poll_interval))
AddActivePeriod(now - TimeDelta::FromSeconds(poll_interval), now);
else
AddActivePeriod(last_idle_check_, now);
}
last_idle_check_ = now;
last_idle_state_ = state;
}
void DeviceStatusCollector::GetStatus(em::DeviceStatusReportRequest* request) {
// Report device active periods.
const ListValue* active_periods =
local_state_->GetList(kPrefDeviceActivePeriods);
em::TimePeriod* time_period;
DCHECK(active_periods->GetSize() % 2 == 0);
int period_count = active_periods->GetSize() / 2;
for (int i = 0; i < period_count; i++) {
int64 start, end;
if (!GetTimestamp(active_periods, 2 * i, &start) ||
!GetTimestamp(active_periods, 2 * i + 1, &end) ||
end < start) {
// Something is amiss -- bail out.
NOTREACHED();
break;
}
time_period = request->add_active_time();
time_period->set_start_timestamp(start);
time_period->set_end_timestamp(end);
}
ListPrefUpdate update(local_state_, kPrefDeviceActivePeriods);
update.Get()->Clear();
chrome::VersionInfo version_info;
request->set_browser_version(version_info.Version());
request->set_os_version(os_version_);
request->set_firmware_version(firmware_version_);
// Report the state of the dev switch at boot.
std::string dev_switch_mode;
if (statistics_provider_->GetMachineStatistic(
"devsw_boot", &dev_switch_mode)) {
if (dev_switch_mode == "1")
request->set_boot_mode("Dev");
else if (dev_switch_mode == "0")
request->set_boot_mode("Verified");
}
}
void DeviceStatusCollector::OnOSVersion(VersionLoader::Handle handle,
std::string version) {
os_version_ = version;
}
void DeviceStatusCollector::OnOSFirmware(VersionLoader::Handle handle,
std::string version) {
firmware_version_ = version;
}
} // namespace policy
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