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// Copyright 2016 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 "components/metrics/data_use_tracker.h"
#include <string>
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "components/metrics/metrics_pref_names.h"
#include "components/prefs/scoped_user_pref_update.h"
#include "components/variations/variations_associated_data.h"
namespace metrics {
namespace {
// This function is for forwarding metrics usage pref changes to the appropriate
// callback on the appropriate thread.
// TODO(gayane): Reduce the frequency of posting tasks from IO to UI thread.
void UpdateMetricsUsagePrefs(
const UpdateUsagePrefCallbackType& update_on_ui_callback,
scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
const std::string& service_name,
int message_size,
bool is_cellular) {
ui_task_runner->PostTask(
FROM_HERE, base::Bind(update_on_ui_callback, service_name, message_size,
is_cellular));
}
} // namespace
DataUseTracker::DataUseTracker(PrefService* local_state)
: local_state_(local_state), weak_ptr_factory_(this) {}
DataUseTracker::~DataUseTracker() {}
// static
scoped_ptr<DataUseTracker> DataUseTracker::Create(PrefService* local_state) {
scoped_ptr<DataUseTracker> data_use_tracker;
if (variations::GetVariationParamValue("UMA_EnableCellularLogUpload",
"Uma_Quota") != "" &&
variations::GetVariationParamValue("UMA_EnableCellularLogUpload",
"Uma_Ratio") != "") {
data_use_tracker.reset(new DataUseTracker(local_state));
}
return data_use_tracker;
}
// static
void DataUseTracker::RegisterPrefs(PrefRegistrySimple* registry) {
registry->RegisterDictionaryPref(metrics::prefs::kUserCellDataUse);
registry->RegisterDictionaryPref(metrics::prefs::kUmaCellDataUse);
}
UpdateUsagePrefCallbackType DataUseTracker::GetDataUseForwardingCallback(
scoped_refptr<base::SequencedTaskRunner> ui_task_runner) {
DCHECK(ui_task_runner->RunsTasksOnCurrentThread());
return base::Bind(
&UpdateMetricsUsagePrefs,
base::Bind(&DataUseTracker::UpdateMetricsUsagePrefsOnUIThread,
weak_ptr_factory_.GetWeakPtr()),
ui_task_runner);
}
bool DataUseTracker::ShouldUploadLogOnCellular(int log_bytes) {
DCHECK(thread_checker_.CalledOnValidThread());
RemoveExpiredEntries();
int uma_weekly_quota_bytes;
if (!GetUmaWeeklyQuota(&uma_weekly_quota_bytes))
return true;
int uma_total_data_use = ComputeTotalDataUse(prefs::kUmaCellDataUse);
int new_uma_total_data_use = log_bytes + uma_total_data_use;
// If the new log doesn't increase the total UMA traffic to be above the
// allowed quota then the log should be uploaded.
if (new_uma_total_data_use <= uma_weekly_quota_bytes)
return true;
double uma_ratio;
if (!GetUmaRatio(&uma_ratio))
return true;
int user_total_data_use = ComputeTotalDataUse(prefs::kUserCellDataUse);
// If after adding the new log the uma ratio is still under the allowed ratio
// then the log should be uploaded and vice versa.
return new_uma_total_data_use /
static_cast<double>(log_bytes + user_total_data_use) <=
uma_ratio;
}
void DataUseTracker::UpdateMetricsUsagePrefsOnUIThread(
const std::string& service_name,
int message_size,
bool is_celllular) {
DCHECK(thread_checker_.CalledOnValidThread());
if (!is_celllular)
return;
UpdateUsagePref(prefs::kUserCellDataUse, message_size);
if (service_name == "UMA")
UpdateUsagePref(prefs::kUmaCellDataUse, message_size);
}
void DataUseTracker::UpdateUsagePref(const std::string& pref_name,
int message_size) {
DCHECK(thread_checker_.CalledOnValidThread());
DictionaryPrefUpdate pref_updater(local_state_, pref_name);
int todays_traffic = 0;
std::string todays_key = GetCurrentMeasurementDateAsString();
const base::DictionaryValue* user_pref_dict =
local_state_->GetDictionary(pref_name);
user_pref_dict->GetInteger(todays_key, &todays_traffic);
pref_updater->SetInteger(todays_key, todays_traffic + message_size);
}
void DataUseTracker::RemoveExpiredEntries() {
DCHECK(thread_checker_.CalledOnValidThread());
RemoveExpiredEntriesForPref(prefs::kUmaCellDataUse);
RemoveExpiredEntriesForPref(prefs::kUserCellDataUse);
}
void DataUseTracker::RemoveExpiredEntriesForPref(const std::string& pref_name) {
DCHECK(thread_checker_.CalledOnValidThread());
const base::DictionaryValue* user_pref_dict =
local_state_->GetDictionary(pref_name);
const base::Time current_date = GetCurrentMeasurementDate();
const base::Time week_ago = current_date - base::TimeDelta::FromDays(7);
base::DictionaryValue user_pref_new_dict;
for (base::DictionaryValue::Iterator it(*user_pref_dict); !it.IsAtEnd();
it.Advance()) {
base::Time key_date;
base::Time::FromUTCString(it.key().c_str(), &key_date);
if (key_date > week_ago)
user_pref_new_dict.Set(it.key(), it.value().CreateDeepCopy());
}
local_state_->Set(pref_name, user_pref_new_dict);
}
// Note: We compute total data use regardless of what is the current date. In
// scenario when user travels back in time zone and current date becomes earlier
// than latest registered date in perf, we still count that in total use as user
// actually used that data.
int DataUseTracker::ComputeTotalDataUse(const std::string& pref_name) {
DCHECK(thread_checker_.CalledOnValidThread());
int total_data_use = 0;
const base::DictionaryValue* pref_dict =
local_state_->GetDictionary(pref_name);
for (base::DictionaryValue::Iterator it(*pref_dict); !it.IsAtEnd();
it.Advance()) {
int value = 0;
it.value().GetAsInteger(&value);
total_data_use += value;
}
return total_data_use;
}
bool DataUseTracker::GetUmaWeeklyQuota(int* uma_weekly_quota_bytes) const {
DCHECK(thread_checker_.CalledOnValidThread());
std::string param_value_str = variations::GetVariationParamValue(
"UMA_EnableCellularLogUpload", "Uma_Quota");
if (param_value_str.empty())
return false;
base::StringToInt(param_value_str, uma_weekly_quota_bytes);
return true;
}
bool DataUseTracker::GetUmaRatio(double* ratio) const {
DCHECK(thread_checker_.CalledOnValidThread());
std::string param_value_str = variations::GetVariationParamValue(
"UMA_EnableCellularLogUpload", "Uma_Ratio");
if (param_value_str.empty())
return false;
base::StringToDouble(param_value_str, ratio);
return true;
}
base::Time DataUseTracker::GetCurrentMeasurementDate() const {
return base::Time::Now().LocalMidnight();
}
std::string DataUseTracker::GetCurrentMeasurementDateAsString() const {
DCHECK(thread_checker_.CalledOnValidThread());
base::Time::Exploded today_exploded;
GetCurrentMeasurementDate().LocalExplode(&today_exploded);
return base::StringPrintf("%04d-%02d-%02d", today_exploded.year,
today_exploded.month, today_exploded.day_of_month);
}
} // namespace metrics
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