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) {
+  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 |name|
+// is not static.
+void IncreaseSparseHistogramByValue(const std::string& name,
+                                    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(){};
+
+void DataUseMeasurement::ReportDataUseUMA(
+    const net::URLRequest* request) const {
+  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() and
+  // URLRequest::GetTotalSentBytes(), 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 total_upload_bytes = request->GetTotalSentBytes();
+  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) {
+    DataUseUserData::ServiceName service_name =
+        attached_service_data ? attached_service_data->service_name()
+                              : DataUseUserData::NOT_TAGGED;
+    ReportDataUsageServices(service_name, UPSTREAM, total_upload_bytes);
+    ReportDataUsageServices(service_name, DOWNSTREAM, total_received_bytes);
+  }
+}
+
+#if defined(OS_ANDROID)
+void DataUseMeasurement::OnApplicationStateChangeForTesting(
+    base::android::ApplicationState application_state) {
+  app_state_ = application_state;
+}
+#endif
+
+DataUseMeasurement::AppState DataUseMeasurement::CurrentAppState() const {
+#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;
+}
+
+std::string DataUseMeasurement::GetSuffixForHistogramName(
+    TrafficDirection dir) const {
+  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");
+}
+
+#if defined(OS_ANDROID)
+void DataUseMeasurement::OnApplicationStateChange(
+    base::android::ApplicationState application_state) {
+  app_state_ = application_state;
+}
+#endif
+
+void DataUseMeasurement::ReportDataUsageServices(
+    DataUseUserData::ServiceName service,
+    TrafficDirection dir,
+    int64_t message_size) const {
+  RecordUMAHistogramCount(
+      DataUseUserData::GetServiceNameAsString(service, "DataUse.MessageSize."),
+      message_size);

[mmenke, 2015/09/11 13:59:07]

Sorry, put my comment at the wrong spot.  See comment below.  Also, at this
spot, you should go back to what you had before, but remove the extra
std::string.  That is, this should be:

RecordUMAHistogramCount(
    "DataUse.MessageSize." + DataUseUserData::GetServiceNameAsString(service),
    ...

(No std::string around DataUseUserData::GetServiceNameAsString(service) - it
already returns a string, not a char*)

[amohammadkhan, 2015/09/11 17:42:48]

Done.

+  if (message_size > 0) {
+    IncreaseSparseHistogramByValue(
+        "DataUse.MessageSize.AllServices" + GetSuffixForHistogramName(dir),
+        service, message_size);

[mmenke, 2015/09/11 13:59:07]

Was thinking of having this here:

     IncreaseSparseHistogramByValue(
          GetHistogramName("DataUse.MessageSize.AllServices",
GetSuffixForHistogramName(dir)));

[amohammadkhan, 2015/09/11 17:42:48]

Done.

+  }
+}
+
+void DataUseMeasurement::ReportDataUsageGeneral(
+    RequestInitiator request_initiator,
+    TrafficDirection dir,
+    int64_t message_size) const {
+  std::string histogram_name = base::StringPrintf(
+      "DataUse.TrafficSize.%s%s",
+      request_initiator == REQUEST_INITIATOR_USER ? "User" : "System",
+      GetSuffixForHistogramName(dir).c_str());
+  RecordUMAHistogramCount(histogram_name, message_size);
+}
+
+}  // namespace data_use_measurement