Implement UMA log throttling for cellular connections

components/metrics/data_use_tracker.cc

Index: components/metrics/data_use_tracker.cc
diff --git a/components/metrics/data_use_tracker.cc b/components/metrics/data_use_tracker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ab3346341b5ce67473f0a41f9fbd2c378435d422
--- /dev/null
+++ b/components/metrics/data_use_tracker.cc
@@ -0,0 +1,199 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.

[Alexei Svitkine (slow), 2016/03/29 16:29:10]

2016

[gayane -on leave until 09-2017, 2016/03/31 01:38:24]

Done.

+// 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"
+#include "content/public/browser/browser_thread.h"
+
+namespace metrics {
+
+namespace {
+static scoped_ptr<metrics::DataUseTracker> instance_;

[Alexei Svitkine (slow), 2016/03/29 16:29:10]

This is not needed anymore, right?

[gayane -on leave until 09-2017, 2016/03/31 01:38:24]

Done.

+}
+
+// static
+void DataUseTracker::GetForwardingCallback(
+    base::WeakPtr<DataUseTracker> data_use_tracker,
+    base::Callback<void(base::Callback<void(const std::string&, int)>)>
+        reply_callback) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  content::BrowserThread::PostTaskAndReplyWithResult(
+      content::BrowserThread::UI, FROM_HERE,
+      base::Bind(&DataUseTracker::GetForwardingCallbackOnUIThread,
+                 data_use_tracker),
+      reply_callback);
+}
+
+// static
+base::Callback<void(const std::string&, int)>
+DataUseTracker::GetForwardingCallbackOnUIThread(
+    base::WeakPtr<DataUseTracker> data_use_tracker) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  return base::Bind(&DataUseTracker::UpdateMetricsUsagePrefsOnUIThread,
+                    data_use_tracker);
+}
+
+void DataUseTracker::RunOnUI(
+    base::Callback<void(const std::string&, int)> callback,
+    const std::string& service_name,
+    int message_size) {
+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI, FROM_HERE,
+      base::Bind(callback, service_name, message_size));
+}
+
+// static
+void DataUseTracker::RegisterPrefs(PrefRegistrySimple* registry) {
+  registry->RegisterDictionaryPref(metrics::prefs::kUserCellDataUse);
+  registry->RegisterDictionaryPref(metrics::prefs::kUmaCellDataUse);
+}
+
+DataUseTracker::DataUseTracker(PrefService* local_state)
+    : local_state_(local_state),
+      uma_qouta_for_testing_(0),
+      uma_ratio_for_testing_(0),
+      weak_ptr_factory_(this) {}
+
+DataUseTracker::~DataUseTracker() {}
+
+std::string DataUseTracker::GetCurrentMeasurementDate() {
+  if (!date_for_testing_.empty())
+    return date_for_testing_;
+
+  base::Time::Exploded today_exploded;
+  base::Time::Now().LocalMidnight().LocalExplode(&today_exploded);
+  return base::StringPrintf("%04d-%02d-%02d", today_exploded.year,
+                            today_exploded.month, today_exploded.day_of_month);
+}
+
+void DataUseTracker::UpdateMetricsUsagePrefsOnUIThread(
+    const std::string& service_name,
+    int message_size) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  UpdateUsagePref(prefs::kUserCellDataUse, message_size);
+  if (service_name == "UMA")
+    UpdateUsagePref(prefs::kUmaCellDataUse, message_size);
+}
+
+void DataUseTracker::RemoveExpiredEntries() {
+  RemoveExpiredEntriesForPref(prefs::kUmaCellDataUse);
+  RemoveExpiredEntriesForPref(prefs::kUserCellDataUse);
+}
+
+void DataUseTracker::RemoveExpiredEntriesForPref(const std::string& pref_name) {
+  const base::DictionaryValue* user_pref_dict =
+      local_state_->GetDictionary(pref_name);
+  if (!user_pref_dict)
+    return;
+  base::DictionaryValue user_pref_new_dict;
+  for (base::DictionaryValue::Iterator it(*user_pref_dict); !it.IsAtEnd();
+       it.Advance()) {
+    base::Time start_of_week =
+        base::Time::Now().LocalMidnight() - base::TimeDelta::FromDays(7);
+    base::Time key_date;
+    base::Time::FromString(it.key().c_str(), &key_date);
+    if (key_date >= start_of_week) {
+      user_pref_new_dict.Set(it.key(), it.value().CreateDeepCopy());
+    }
+  }
+  local_state_->Set(pref_name, user_pref_new_dict);
+}
+
+void DataUseTracker::UpdateUsagePref(const std::string& pref_name,
+                                     int message_size) {
+  DictionaryPrefUpdate pref_updater(local_state_, pref_name);
+  int todays_traffic = 0;
+  std::string todays_key = GetCurrentMeasurementDate();
+  local_state_->GetDictionary(pref_name)->GetInteger(todays_key,
+                                                     &todays_traffic);
+  pref_updater->SetInteger(todays_key, todays_traffic + message_size);
+}
+
+bool DataUseTracker::CanUploadUMALog(int log_bytes) {
+  RemoveExpiredEntries();
+  int uma_total_data_use = ComputeTotalDataUse(prefs::kUmaCellDataUse);
+  int uma_qouta;
+  bool is_qouta_specified = GetUmaQouta(&uma_qouta);
+  if (!is_qouta_specified || log_bytes + uma_total_data_use <= uma_qouta)
+    return true;
+
+  double uma_ratio;
+  bool is_ratio_specified = GetUmaRatio(&uma_ratio);
+  if (!is_ratio_specified)
+    return true;
+
+  int user_total_data_use = ComputeTotalDataUse(prefs::kUserCellDataUse);
+  return (log_bytes + uma_total_data_use) /
+             (double)(log_bytes + user_total_data_use) <=
+         uma_ratio;
+}
+
+int DataUseTracker::ComputeTotalDataUse(std::string pref_name) {
+  int total_data_use = 0;
+  const base::DictionaryValue* pref_dict =
+      local_state_->GetDictionary(pref_name);
+  if (!pref_dict)
+    return total_data_use;
+  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::GetUmaQouta(int* qouta) {
+  if (uma_qouta_for_testing_ > 0) {
+    *qouta = uma_qouta_for_testing_;
+    return true;
+  }
+
+  std::string param_value_str = variations::GetVariationParamValue(
+      "UMA_EnableCellularLogUpload", "Uma_Qouta");
+  if (param_value_str.empty())
+    return false;
+
+  base::StringToInt(param_value_str, qouta);
+  return true;
+}
+
+bool DataUseTracker::GetUmaRatio(double* ratio) {
+  if (uma_ratio_for_testing_ > 0) {
+    *ratio = uma_ratio_for_testing_;
+    return true;
+  }
+
+  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;
+}
+
+void DataUseTracker::SetMeasurementDateForTesting(const std::string& date) {
+  date_for_testing_ = date;
+}
+
+void DataUseTracker::SetUmaQoutaForTesting(int uma_qouta) {
+  uma_qouta_for_testing_ = uma_qouta;
+}
+
+void DataUseTracker::SetUmaRatioForTesting(double uma_ratio) {
+  uma_ratio_for_testing_ = uma_ratio;
+}
+
+base::WeakPtr<DataUseTracker> DataUseTracker::GetWeakPtr() {
+  return weak_ptr_factory_.GetWeakPtr();
+}
+
+}  // namespace metrics