Support needed to measure user and service traffic in Chrome.

net/url_request/data_use_measurement.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.

[bengr, 2015/08/07 18:00:01]

This and the other data_use_measurement.cc should be merged into a single file
and converted into a class. Ask someone on net/ where that class should live.

[amohammadkhan, 2015/08/11 22:04:36]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <string>
+
+#include "base/hash.h"
+#include "base/metrics/histogram.h"
+#include "base/metrics/sparse_histogram.h"
+#include "net/base/network_change_notifier.h"
+#include "net/url_request/data_use_measurement.h"
+#include "net/url_request/url_fetcher.h"
+
+#if defined(OS_ANDROID)
+#include "base/android/application_status_listener.h"
+#endif
+
+#define UMA_HISTOGRAM_SPARSE_SLOWLY_WITH_VALUE(name, sample, value)     \
+  do {                                                                  \
+    base::HistogramBase* histogram = base::SparseHistogram::FactoryGet( \
+        name, base::HistogramBase::kUmaTargetedHistogramFlag);          \
+    histogram->AddCount(sample, value);                                 \
+  } while (0)
+
+// Copied from chromecast/base/metrics/cast_histograms.h

[bengr, 2015/08/07 18:00:01]

More copying? Add a TODO to unify with cast. Are these the same as in your other
file? If so, try to put them somewhere common.

[amohammadkhan, 2015/08/11 22:04:36]

Done.

+#define STATIC_HISTOGRAM_POINTER_BLOCK_NO_CACHE(                               \
+    constant_histogram_name, histogram_add_method_invocation,                  \
+    histogram_factory_get_invocation)                                          \
+  do {                                                                         \
+    base::HistogramBase* histogram_pointer = histogram_factory_get_invocation; \
+    if (DCHECK_IS_ON())                                                        \
+      histogram_pointer->CheckName(constant_histogram_name);                   \
+    histogram_pointer->histogram_add_method_invocation;                        \
+  } while (0)
+
+// Copied from chromecast/base/metrics/cast_histograms.h
+#define UMA_HISTOGRAM_CUSTOM_COUNTS_NO_CACHE(name, sample, min, max, \
+                                             bucket_count)           \
+  STATIC_HISTOGRAM_POINTER_BLOCK_NO_CACHE(                           \
+      name, Add(sample), base::Histogram::FactoryGet(                \
+                             name, min, max, bucket_count,           \
+                             base::HistogramBase::kUmaTargetedHistogramFlag))
+
+// NO_CACHE version of UMA_HISTOGRAM_CUSTOM_COUNT is used because the names of
+// histograms may change when measurement is done for different services
+// the maximum size of the request is about 5MB which may not be enough for
+// large contents.
+#define TRAFFIC_MEASUREMENT_UMA_HISTOGRAM(name, sample) \
+  UMA_HISTOGRAM_CUSTOM_COUNTS_NO_CACHE(name, sample, 1, 5000000, 50)
+
+namespace {
+
+// Enumerates the direction of data. Specifies the measured data was sent or

[bengr, 2015/08/07 18:00:01]

Remove the first sentence.

[amohammadkhan, 2015/08/11 22:04:36]

Done.

+// received data
+enum TrafficDirection { DOWNLOAD, UPLOAD };
+
+// Enumerates application state. For non android versions it is always

[bengr, 2015/08/07 18:00:01]

Android.

[amohammadkhan, 2015/08/11 22:04:36]

Done.

+// foreground

[bengr, 2015/08/07 18:00:01]

Add a period.

[amohammadkhan, 2015/08/11 22:04:36]

Done.

+enum AppState { BACKGROUND, FOREGROUND };
+
+enum ConnectionType { CELLULAR, WIFI };
+
+#if defined(OS_ANDROID)
+// It seems it is not updated at the beginning, so if we start in background
+// somehow, it might be buggy until an event happens.

[bengr, 2015/08/07 18:00:01]

Be clearer about this.

[amohammadkhan, 2015/08/11 22:04:36]

Done.

+base::android::ApplicationState app_state =
+    base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES;
+base::android::ApplicationStatusListener* app_listener;
+#endif
+
+// A flag to signal we have just started and we do not have a listener so we
+// need to make one.
+bool listener_made = false;
+
+#if defined(OS_ANDROID)
+void OnApplicationStateChange(
+    base::android::ApplicationState application_state) {
+  app_state = application_state;
+}
+#endif
+
+AppState CurrentAppState() {
+#if defined(OS_ANDROID)
+  if (app_state == base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES)
+    return FOREGROUND;
+  else
+    return BACKGROUND;
+#endif
+  // If the OS is not Android, all the requests are considered foreground so for
+  // fair comparison between foreground and background data use, -A histograms
+  // should be chosen in UMA.
+  return FOREGROUND;
+}
+
+ConnectionType CurrentConnectionType() {
+  if (net::NetworkChangeNotifier::IsConnectionCellular(
+          net::NetworkChangeNotifier::GetConnectionType())) {
+    return CELLULAR;
+  }
+  // All not cellular connections are considered Wifi.
+  return WIFI;
+}
+
+void ReportDataUsage(const std::string& service_name,
+                     TrafficDirection dir,
+                     int message_size) {
+  AppState current_app_state = CurrentAppState();
+  ConnectionType connType = CurrentConnectionType();
+  std::string first_suffix = "";
+  std::string second_suffix = "";
+  std::string third_suffix = "";
+  if (dir == UPLOAD) {
+    first_suffix = ".Download";
+  } else {
+    first_suffix = ".Upload";
+  }
+  if (current_app_state == BACKGROUND) {
+    second_suffix = ".Background";
+  } else {
+    second_suffix = ".Foreground";
+  }
+  if (connType == WIFI) {
+    third_suffix = ".Wifi";
+  } else {
+    third_suffix = ".Cell";
+  }
+  std::string serviceHistogramName = "DataUse.Service." + service_name;
+  std::string combinedHistogramName =
+      "DataUse.Services" + first_suffix + second_suffix + third_suffix;
+  UMA_HISTOGRAM_SPARSE_SLOWLY_WITH_VALUE(
+      combinedHistogramName, base::Hash(service_name), message_size);
+  TRAFFIC_MEASUREMENT_UMA_HISTOGRAM(serviceHistogramName, message_size);
+}
+
+}  // namespace
+
+void DataUseReport(const std::string& service_name,
+                   const net::URLFetcher* fetcher) {
+#if defined(OS_ANDROID)
+  if (!listener_made) {
+    listener_made = true;
+    app_listener = new base::android::ApplicationStatusListener(
+        base::Bind(&OnApplicationStateChange));
+  }
+#endif
+  int total_upload_bytes = fetcher->GetBytesSentSize();
+  int total_received_bytes = fetcher->GetBytesReceivedSize();
+  ReportDataUsage(service_name, UPLOAD, total_upload_bytes);
+  ReportDataUsage(service_name, DOWNLOAD, total_received_bytes);
+}