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/metrics/metrics_reporting_state.h"
6
7#include "base/callback.h"
8#include "base/metrics/histogram.h"
9#include "base/prefs/pref_service.h"
10#include "chrome/browser/browser_process.h"
11#include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
12#include "chrome/common/pref_names.h"
13#include "chrome/installer/util/google_update_settings.h"
14#include "components/metrics/metrics_service.h"
15#include "content/public/browser/browser_thread.h"
16
17namespace {
18
19enum MetricsReportingChangeHistogramValue {
20  METRICS_REPORTING_ERROR,
21  METRICS_REPORTING_DISABLED,
22  METRICS_REPORTING_ENABLED,
23  METRICS_REPORTING_MAX
24};
25
26void RecordMetricsReportingHistogramValue(
27    MetricsReportingChangeHistogramValue value) {
28  UMA_HISTOGRAM_ENUMERATION(
29      "UMA.MetricsReporting.Toggle", value, METRICS_REPORTING_MAX);
30}
31
32// Tries to set metrics reporting status to |enabled| and returns whatever is
33// the result of the update.
34bool SetGoogleUpdateSettings(bool enabled) {
35  GoogleUpdateSettings::SetCollectStatsConsent(enabled);
36  bool updated_pref = GoogleUpdateSettings::GetCollectStatsConsent();
37  if (enabled != updated_pref)
38    DVLOG(1) << "Unable to set metrics reporting status to " << enabled;
39
40  return updated_pref;
41}
42
43// Does the necessary changes for MetricsReportingEnabled changes which needs
44// to be done in the main thread.
45// As arguments this function gets:
46//  |to_update_pref| which indicates what the desired update should be,
47//  |callback_fn| is the callback function to be called in the end
48//  |updated_pref| is the result of attempted update.
49// Update considers to be successful if |to_update_pref| and |updated_pref| are
50// the same.
51void SetMetricsReporting(bool to_update_pref,
52                         const OnMetricsReportingCallbackType& callback_fn,
53                         bool updated_pref) {
54  metrics::MetricsService* metrics = g_browser_process->metrics_service();
55  if (metrics) {
56    if (updated_pref)
57      metrics->Start();
58    else
59      metrics->Stop();
60  }
61#if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
62  g_browser_process->local_state()->SetBoolean(
63      prefs::kMetricsReportingEnabled, updated_pref);
64#endif
65  if (to_update_pref == updated_pref) {
66    RecordMetricsReportingHistogramValue(updated_pref ?
67        METRICS_REPORTING_ENABLED : METRICS_REPORTING_DISABLED);
68  } else {
69    RecordMetricsReportingHistogramValue(METRICS_REPORTING_ERROR);
70  }
71  if (!callback_fn.is_null())
72    callback_fn.Run(updated_pref);
73}
74
75} // namespace
76
77void InitiateMetricsReportingChange(
78    bool enabled,
79    const OnMetricsReportingCallbackType& callback_fn) {
80#if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
81  if (!IsMetricsReportingUserChangable()) {
82    if (!callback_fn.is_null()) {
83      callback_fn.Run(
84          ChromeMetricsServiceAccessor::IsMetricsReportingEnabled());
85    }
86    return;
87  }
88#endif
89  // Posts to FILE thread as SetGoogleUpdateSettings does IO operations.
90  content::BrowserThread::PostTaskAndReplyWithResult(
91      content::BrowserThread::FILE,
92      FROM_HERE,
93      base::Bind(&SetGoogleUpdateSettings, enabled),
94      base::Bind(&SetMetricsReporting, enabled, callback_fn));
95}
96
97bool IsMetricsReportingUserChangable() {
98  const PrefService* pref_service = g_browser_process->local_state();
99  const PrefService::Preference* pref =
100      pref_service->FindPreference(prefs::kMetricsReportingEnabled);
101  return pref && !pref->IsManaged();
102}
103