Support needed to measure user and service traffic in Chrome.

components/data_use_measurement/content/data_use_measurement.cc

+// Copyright 2015 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/data_use_measurement/content/data_use_measurement.h"
+
+#include "base/metrics/histogram.h"
+#include "base/metrics/sparse_histogram.h"
+#include "base/strings/stringprintf.h"
+#include "content/public/browser/resource_request_info.h"
+#include "net/base/network_change_notifier.h"
+#include "net/base/upload_data_stream.h"
+#include "net/http/http_response_headers.h"
+#include "net/url_request/url_request.h"
+
+namespace data_use_measurement {
+
+namespace {
+
+// Records the occurrence of |sample| in |name| histogram. Conventional UMA
+// histograms are not used because the |name| is not static.
+void RecordUMAHistogramCount(const std::string& name, int64_t sample) {

[mmenke, 2015/09/04 20:51:45]

#include <stdint.h>

#include <string> 

[amohammadkhan, 2015/09/05 00:58:02]

They are included in data_use_measurement.h. do I need to include them again?

+  base::HistogramBase* histogram_pointer = base::Histogram::FactoryGet(
+      name,
+      1,        // Minimum sample size in bytes.
+      1000000,  // Maximum sample size in bytes. Should cover most of the
+                // requests by services.
+      50,       // Bucket count.
+      base::HistogramBase::kUmaTargetedHistogramFlag);
+  histogram_pointer->Add(sample);
+}
+
+// This function increases the value of |sample| bucket in |name| sparse
+// histogram by |value|. Conventional UMA histograms are not used because the
+// |name| is not static.

[mmenke, 2015/09/04 20:51:45]

nit:  the |name| -> |name|

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+void RecordSparseHistogramWithValue(const std::string& name,

[mmenke, 2015/09/04 20:51:46]

This name is confusing - it sounds like it's recording value in a histogram,
which it isn't.  IncreaseSparseHistogramByValue, maybe?

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+                                    int64_t sample,
+                                    int64_t value) {
+  base::HistogramBase* histogram = base::SparseHistogram::FactoryGet(
+      name, base::HistogramBase::kUmaTargetedHistogramFlag);
+  histogram->AddCount(sample, value);
+}
+
+}  // namespace
+
+DataUseMeasurement::DataUseMeasurement()
+#if defined(OS_ANDROID)
+    : app_state_(base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES),
+      app_listener_(new base::android::ApplicationStatusListener(
+          base::Bind(&DataUseMeasurement::OnApplicationStateChange,
+                     base::Unretained(this))))
+#endif
+{
+}
+
+DataUseMeasurement::~DataUseMeasurement() {
+#if defined(OS_ANDROID)
+  // Prevent notification between the destruction of the DataUseMeasurement
+  // instance and the destruction of |app_listener_|.
+  app_listener_.reset();
+#endif

[mmenke, 2015/09/04 20:51:46]

This explicit reset is not needed - it's a scoped_ptr, so it will be deleted
here anyways, and since it will always be run on this thread, and we're already
running on this thread, it can't be called into during teardown, so destroying
it slightly earlier while deleting |this| doesn't matter.

[amohammadkhan, 2015/09/05 00:58:02]

Done.

+}
+
+void DataUseMeasurement::ReportDataUseUMA(const net::URLRequest* request) {
+  const content::ResourceRequestInfo* info =
+      content::ResourceRequestInfo::ForRequest(request);
+  // Having |info| is the sign of a request for a web content from user. For now
+  // we could add a condition to check ProcessType in info is
+  // content::PROCESS_TYPE_RENDERER, but it won't be compatible with upcoming
+  // PlzNavigate architecture. So just existence of |info| is verified, and the
+  // current check should be compatible with upcoming changes in PlzNavigate.
+  bool is_user_traffic = info != nullptr;
+
+  // Counts rely on URLRequest::GetTotalReceivedBytes(), which does not include
+  // the send path, network layer overhead, TLS overhead, and DNS.
+  // TODO(amohammadkhan): Make these measured bytes more in line with number of
+  // bytes in lower levels.
+  int64_t request_body_bytes = 0;
+  int64_t request_header_bytes = 0;
+  int64_t total_upload_bytes = 0;
+  if (request->has_upload())
+    request_body_bytes = request->get_upload()->size();
+  net::HttpRequestHeaders request_headers;
+  if (request->GetFullRequestHeaders(&request_headers))
+    request_header_bytes = request_headers.ToString().length();
+  total_upload_bytes = request_body_bytes + request_header_bytes;
+  int64_t total_received_bytes = request->GetTotalReceivedBytes();
+
+  ReportDataUsageGeneral(
+      is_user_traffic ? REQUEST_INITIATOR_USER : REQUEST_INITIATOR_SERVICE,
+      UPSTREAM, total_upload_bytes);
+  ReportDataUsageGeneral(
+      is_user_traffic ? REQUEST_INITIATOR_USER : REQUEST_INITIATOR_SERVICE,
+      DOWNSTREAM, total_received_bytes);
+  DataUseUserData* attached_service_data = reinterpret_cast<DataUseUserData*>(
+      request->GetUserData(DataUseUserData::kUserDataKey));
+
+  if (!is_user_traffic) {
+    data_use_measurement::DataUseUserData::ServiceType service_type =
+        attached_service_data
+            ? attached_service_data->service_type()
+            : data_use_measurement::DataUseUserData::NOT_TAGGED;
+    ReportDataUsageServices(service_type, UPSTREAM, total_upload_bytes);
+    ReportDataUsageServices(service_type, DOWNSTREAM, total_received_bytes);
+  }
+}
+
+#if defined(OS_ANDROID)
+void DataUseMeasurement::OnApplicationStateChange(
+    base::android::ApplicationState application_state) {
+  app_state_ = application_state;
+}
+#endif
+
+#if defined(OS_ANDROID)
+void DataUseMeasurement::OnApplicationStateChangeForTesting(
+    base::android::ApplicationState application_state) {
+  app_state_ = application_state;
+}
+#endif
+
+DataUseMeasurement::AppState DataUseMeasurement::CurrentAppState() {
+#if defined(OS_ANDROID)
+  if (app_state_ != base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES)
+    return BACKGROUND;
+#endif
+  // If the OS is not Android, all the requests are considered Foreground.
+  return FOREGROUND;
+}
+
+const std::string DataUseMeasurement::GetSuffixForHistogramName(
+    TrafficDirection dir) {
+  AppState app_state = CurrentAppState();
+  bool is_conn_cellular = net::NetworkChangeNotifier::IsConnectionCellular(
+      net::NetworkChangeNotifier::GetConnectionType());
+  return base::StringPrintf(
+      ".%s.%s.%s", dir == UPSTREAM ? "Upstream" : "Downstream",
+      app_state == BACKGROUND ? "Background" : "Foreground",
+      is_conn_cellular ? "Cellular" : "NotCellular");
+}
+
+void DataUseMeasurement::ReportDataUsageServices(
+    data_use_measurement::DataUseUserData::ServiceType service,
+    TrafficDirection dir,
+    int64_t message_size) {
+  RecordUMAHistogramCount(
+      "DataUse.MessageSize." +
+          std::string(DataUseUserData::GetServiceName(service)),
+      message_size);
+  if (message_size > 0) {
+    RecordSparseHistogramWithValue(
+        "DataUse.MessageSize.AllServices" + GetSuffixForHistogramName(dir),
+        service, message_size);
+  }
+}
+
+void DataUseMeasurement::ReportDataUsageGeneral(RequestInitiator service_type,
+                                                TrafficDirection dir,
+                                                int64_t message_size) {
+  std::string histogram_name = base::StringPrintf(
+      "DataUse.TrafficSize.%s%s",
+      service_type == REQUEST_INITIATOR_USER ? "User" : "System",
+      GetSuffixForHistogramName(dir).c_str());
+  RecordUMAHistogramCount(histogram_name, message_size);
+}
+
+}  // namespace data_use_measurement