chrome/browser/chromeos/external_metrics.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/chromeos/external_metrics.h"
   6
   7 #include <map>
   8 #include <string>
   9
  10 #include "base/bind.h"
  11 #include "base/files/file_path.h"
  12 #include "base/files/file_util.h"
  13 #include "base/metrics/field_trial.h"
  14 #include "base/metrics/histogram.h"
  15 #include "base/metrics/sparse_histogram.h"
  16 #include "base/metrics/statistics_recorder.h"
  17 #include "base/timer/elapsed_timer.h"
  18 #include "chrome/browser/browser_process.h"
  19 #include "chrome/browser/metrics/chromeos_metrics_provider.h"
  20 #include "components/metrics/metrics_service.h"
  21 #include "components/metrics/serialization/metric_sample.h"
  22 #include "components/metrics/serialization/serialization_utils.h"
  23 #include "content/public/browser/browser_thread.h"
  24 #include "content/public/browser/user_metrics.h"
  25
  26 using base::UserMetricsAction;
  27 using content::BrowserThread;
  28
  29 namespace chromeos {
  30
  31 namespace {
  32
  33 bool CheckValues(const std::string& name,
  34                  int minimum,
  35                  int maximum,
  36                  size_t bucket_count) {
  37   if (!base::Histogram::InspectConstructionArguments(
  38       name, &minimum, &maximum, &bucket_count))
  39     return false;
  40   base::HistogramBase* histogram =
  41       base::StatisticsRecorder::FindHistogram(name);
  42   if (!histogram)
  43     return true;
  44   return histogram->HasConstructionArguments(minimum, maximum, bucket_count);
  45 }
  46
  47 bool CheckLinearValues(const std::string& name, int maximum) {
  48   return CheckValues(name, 1, maximum, maximum + 1);
  49 }
  50
  51 // Establishes field trial for wifi scanning in chromeos.  crbug.com/242733.
  52 void SetupProgressiveScanFieldTrial() {
  53   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
  54   const char name_of_experiment[] = "ProgressiveScan";
  55   const base::FilePath group_file_path(
  56       "/home/chronos/.progressive_scan_variation");
  57   const base::FieldTrial::Probability kDivisor = 1000;
  58   scoped_refptr<base::FieldTrial> trial =
  59       base::FieldTrialList::FactoryGetFieldTrial(
  60           name_of_experiment, kDivisor, "Default", 2013, 12, 31,
  61           base::FieldTrial::SESSION_RANDOMIZED, NULL);
  62
  63   // Announce the groups with 0 percentage; the actual percentages come from
  64   // the server configuration.
  65   std::map<int, std::string> group_to_char;
  66   group_to_char[trial->AppendGroup("FullScan", 0)] = "c";
  67   group_to_char[trial->AppendGroup("33Percent_4MinMax", 0)] = "1";
  68   group_to_char[trial->AppendGroup("50Percent_4MinMax", 0)] = "2";
  69   group_to_char[trial->AppendGroup("50Percent_8MinMax", 0)] = "3";
  70   group_to_char[trial->AppendGroup("100Percent_8MinMax", 0)] = "4";
  71   group_to_char[trial->AppendGroup("100Percent_1MinSeen_A", 0)] = "5";
  72   group_to_char[trial->AppendGroup("100Percent_1MinSeen_B", 0)] = "6";
  73   group_to_char[trial->AppendGroup("100Percent_1Min_4Max", 0)] = "7";
  74
  75   // Announce the experiment to any listeners (especially important is the UMA
  76   // software, which will append the group names to UMA statistics).
  77   const int group_num = trial->group();
  78   std::string group_char = "x";
  79   if (ContainsKey(group_to_char, group_num))
  80     group_char = group_to_char[group_num];
  81
  82   // Write the group to the file to be read by ChromeOS.
  83   int size = static_cast<int>(group_char.length());
  84   if (base::WriteFile(group_file_path, group_char.c_str(), size) == size) {
  85     VLOG(1) << "Configured in group '" << trial->group_name()
  86             << "' ('" << group_char << "') for "
  87             << name_of_experiment << " field trial";
  88   } else {
  89     VLOG(1) << "Couldn't write to " << group_file_path.value();
  90   }
  91 }
  92
  93 }  // namespace
  94
  95 // The interval between external metrics collections in seconds
  96 static const int kExternalMetricsCollectionIntervalSeconds = 30;
  97 const char kEventsFilePath[] = "/var/run/metrics/uma-events";
  98
  99 ExternalMetrics::ExternalMetrics() : uma_events_file_(kEventsFilePath) {
 100 }
 101
 102 ExternalMetrics::~ExternalMetrics() {}
 103
 104 void ExternalMetrics::Start() {
 105   // Register user actions external to the browser.
 106   // tools/metrics/actions/extract_actions.py won't understand these lines, so
 107   // all of these are explicitly added in that script.
 108   // TODO(derat): We shouldn't need to verify actions before reporting them;
 109   // remove all of this once http://crosbug.com/11125 is fixed.
 110   valid_user_actions_.insert("Cryptohome.PKCS11InitFail");
 111   valid_user_actions_.insert("Updater.ServerCertificateChanged");
 112   valid_user_actions_.insert("Updater.ServerCertificateFailed");
 113
 114   // Initialize here field trials that don't need to read from files.
 115   // (None for the moment.)
 116
 117   // Initialize any chromeos field trials that need to read from a file (e.g.,
 118   // those that have an upstart script determine their experimental group for
 119   // them) then schedule the data collection.  All of this is done on the file
 120   // thread.
 121   bool task_posted = BrowserThread::PostTask(
 122       BrowserThread::FILE,
 123       FROM_HERE,
 124       base::Bind(&chromeos::ExternalMetrics::SetupFieldTrialsOnFileThread,
 125                  this));
 126   DCHECK(task_posted);
 127 }
 128
 129 // static
 130 scoped_refptr<ExternalMetrics> ExternalMetrics::CreateForTesting(
 131     const std::string& filename) {
 132   scoped_refptr<ExternalMetrics> external_metrics(new ExternalMetrics());
 133   external_metrics->uma_events_file_ = filename;
 134   return external_metrics;
 135 }
 136
 137 void ExternalMetrics::RecordActionUI(std::string action_string) {
 138   if (valid_user_actions_.count(action_string)) {
 139     content::RecordComputedAction(action_string);
 140   } else {
 141     DLOG(ERROR) << "undefined UMA action: " << action_string;
 142   }
 143 }
 144
 145 void ExternalMetrics::RecordAction(const std::string& action) {
 146   BrowserThread::PostTask(
 147       BrowserThread::UI,
 148       FROM_HERE,
 149       base::Bind(&ExternalMetrics::RecordActionUI, this, action));
 150 }
 151
 152 void ExternalMetrics::RecordCrashUI(const std::string& crash_kind) {
 153   ChromeOSMetricsProvider::LogCrash(crash_kind);
 154 }
 155
 156 void ExternalMetrics::RecordCrash(const std::string& crash_kind) {
 157   BrowserThread::PostTask(
 158       BrowserThread::UI, FROM_HERE,
 159       base::Bind(&ExternalMetrics::RecordCrashUI, this, crash_kind));
 160 }
 161
 162 void ExternalMetrics::RecordHistogram(const metrics::MetricSample& sample) {
 163   CHECK_EQ(metrics::MetricSample::HISTOGRAM, sample.type());
 164   if (!CheckValues(
 165           sample.name(), sample.min(), sample.max(), sample.bucket_count())) {
 166     DLOG(ERROR) << "Invalid histogram: " << sample.name();
 167     return;
 168   }
 169
 170   base::HistogramBase* counter =
 171       base::Histogram::FactoryGet(sample.name(),
 172                                   sample.min(),
 173                                   sample.max(),
 174                                   sample.bucket_count(),
 175                                   base::Histogram::kUmaTargetedHistogramFlag);
 176   counter->Add(sample.sample());
 177 }
 178
 179 void ExternalMetrics::RecordLinearHistogram(
 180     const metrics::MetricSample& sample) {
 181   CHECK_EQ(metrics::MetricSample::LINEAR_HISTOGRAM, sample.type());
 182   if (!CheckLinearValues(sample.name(), sample.max())) {
 183     DLOG(ERROR) << "Invalid linear histogram: " << sample.name();
 184     return;
 185   }
 186   base::HistogramBase* counter = base::LinearHistogram::FactoryGet(
 187       sample.name(),
 188       1,
 189       sample.max(),
 190       sample.max() + 1,
 191       base::Histogram::kUmaTargetedHistogramFlag);
 192   counter->Add(sample.sample());
 193 }
 194
 195 void ExternalMetrics::RecordSparseHistogram(
 196     const metrics::MetricSample& sample) {
 197   CHECK_EQ(metrics::MetricSample::SPARSE_HISTOGRAM, sample.type());
 198   base::HistogramBase* counter = base::SparseHistogram::FactoryGet(
 199       sample.name(), base::HistogramBase::kUmaTargetedHistogramFlag);
 200   counter->Add(sample.sample());
 201 }
 202
 203 int ExternalMetrics::CollectEvents() {
 204   ScopedVector<metrics::MetricSample> samples;
 205   metrics::SerializationUtils::ReadAndTruncateMetricsFromFile(uma_events_file_,
 206                                                               &samples);
 207
 208   for (ScopedVector<metrics::MetricSample>::iterator it = samples.begin();
 209        it != samples.end();
 210        ++it) {
 211     const metrics::MetricSample& sample = **it;
 212
 213     // Do not use the UMA_HISTOGRAM_... macros here.  They cache the Histogram
 214     // instance and thus only work if |sample.name()| is constant.
 215     switch (sample.type()) {
 216       case metrics::MetricSample::CRASH:
 217         RecordCrash(sample.name());
 218         break;
 219       case metrics::MetricSample::USER_ACTION:
 220         RecordAction(sample.name());
 221         break;
 222       case metrics::MetricSample::HISTOGRAM:
 223         RecordHistogram(sample);
 224         break;
 225       case metrics::MetricSample::LINEAR_HISTOGRAM:
 226         RecordLinearHistogram(sample);
 227         break;
 228       case metrics::MetricSample::SPARSE_HISTOGRAM:
 229         RecordSparseHistogram(sample);
 230         break;
 231     }
 232   }
 233
 234   return samples.size();
 235 }
 236
 237 void ExternalMetrics::CollectEventsAndReschedule() {
 238   base::ElapsedTimer timer;
 239   CollectEvents();
 240   UMA_HISTOGRAM_TIMES("UMA.CollectExternalEventsTime", timer.Elapsed());
 241   ScheduleCollector();
 242 }
 243
 244 void ExternalMetrics::ScheduleCollector() {
 245   bool result;
 246   result = BrowserThread::PostDelayedTask(
 247       BrowserThread::FILE, FROM_HERE,
 248       base::Bind(&chromeos::ExternalMetrics::CollectEventsAndReschedule, this),
 249       base::TimeDelta::FromSeconds(kExternalMetricsCollectionIntervalSeconds));
 250   DCHECK(result);
 251 }
 252
 253 void ExternalMetrics::SetupFieldTrialsOnFileThread() {
 254   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 255   // Field trials that do not read from files can be initialized in
 256   // ExternalMetrics::Start() above.
 257   SetupProgressiveScanFieldTrial();
 258
 259   ScheduleCollector();
 260 }
 261
 262 }  // namespace chromeos