content/browser/geolocation/geolocation_service_impl.cc

   1 // Copyright 2014 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 "content/browser/geolocation/geolocation_service_impl.h"
   6
   7 #include "base/bind.h"
   8 #include "base/metrics/histogram.h"
   9 #include "content/browser/geolocation/geolocation_service_context.h"
  10 #include "content/public/common/mojo_geoposition.mojom.h"
  11
  12 namespace content {
  13
  14 namespace {
  15
  16 // Geoposition error codes for reporting in UMA.
  17 enum GeopositionErrorCode {
  18   // NOTE: Do not renumber these as that would confuse interpretation of
  19   // previously logged data. When making changes, also update the enum list
  20   // in tools/metrics/histograms/histograms.xml to keep it in sync.
  21
  22   // There was no error.
  23   GEOPOSITION_ERROR_CODE_NONE = 0,
  24
  25   // User denied use of geolocation.
  26   GEOPOSITION_ERROR_CODE_PERMISSION_DENIED = 1,
  27
  28   // Geoposition could not be determined.
  29   GEOPOSITION_ERROR_CODE_POSITION_UNAVAILABLE = 2,
  30
  31   // Timeout.
  32   GEOPOSITION_ERROR_CODE_TIMEOUT = 3,
  33
  34   // NOTE: Add entries only immediately above this line.
  35   GEOPOSITION_ERROR_CODE_COUNT = 4
  36 };
  37
  38 void RecordGeopositionErrorCode(Geoposition::ErrorCode error_code) {
  39   GeopositionErrorCode code = GEOPOSITION_ERROR_CODE_NONE;
  40   switch (error_code) {
  41     case Geoposition::ERROR_CODE_NONE:
  42       code = GEOPOSITION_ERROR_CODE_NONE;
  43       break;
  44     case Geoposition::ERROR_CODE_PERMISSION_DENIED:
  45       code = GEOPOSITION_ERROR_CODE_PERMISSION_DENIED;
  46       break;
  47     case Geoposition::ERROR_CODE_POSITION_UNAVAILABLE:
  48       code = GEOPOSITION_ERROR_CODE_POSITION_UNAVAILABLE;
  49       break;
  50     case Geoposition::ERROR_CODE_TIMEOUT:
  51       code = GEOPOSITION_ERROR_CODE_TIMEOUT;
  52       break;
  53   }
  54   UMA_HISTOGRAM_ENUMERATION("Geolocation.LocationUpdate.ErrorCode",
  55                             code,
  56                             GEOPOSITION_ERROR_CODE_COUNT);
  57 }
  58
  59 }  // namespace
  60
  61 GeolocationServiceImpl::GeolocationServiceImpl(
  62     GeolocationServiceContext* context,
  63     const base::Closure& update_callback)
  64     : context_(context),
  65       update_callback_(update_callback),
  66       high_accuracy_(false),
  67       has_position_to_report_(false) {
  68   DCHECK(context_);
  69 }
  70
  71 GeolocationServiceImpl::~GeolocationServiceImpl() {
  72 }
  73
  74 void GeolocationServiceImpl::PauseUpdates() {
  75   geolocation_subscription_.reset();
  76 }
  77
  78 void GeolocationServiceImpl::ResumeUpdates() {
  79   if (position_override_.Validate()) {
  80     OnLocationUpdate(position_override_);
  81     return;
  82   }
  83
  84   StartListeningForUpdates();
  85 }
  86
  87 void GeolocationServiceImpl::StartListeningForUpdates() {
  88   geolocation_subscription_ =
  89       GeolocationProvider::GetInstance()->AddLocationUpdateCallback(
  90           base::Bind(&GeolocationServiceImpl::OnLocationUpdate,
  91                      base::Unretained(this)),
  92           high_accuracy_);
  93 }
  94
  95 void GeolocationServiceImpl::SetHighAccuracy(bool high_accuracy) {
  96   UMA_HISTOGRAM_BOOLEAN(
  97       "Geolocation.GeolocationDispatcherHostImpl.EnableHighAccuracy",
  98       high_accuracy);
  99   high_accuracy_ = high_accuracy;
 100
 101   if (position_override_.Validate()) {
 102     OnLocationUpdate(position_override_);
 103     return;
 104   }
 105
 106   StartListeningForUpdates();
 107 }
 108
 109 void GeolocationServiceImpl::QueryNextPosition(
 110     const PositionCallback& callback) {
 111   position_callbacks_.push_back(callback);
 112
 113   if (has_position_to_report_)
 114     ReportCurrentPosition();
 115 }
 116
 117 void GeolocationServiceImpl::SetOverride(const Geoposition& position) {
 118   position_override_ = position;
 119   if (!position_override_.Validate()) {
 120     ResumeUpdates();
 121   }
 122
 123   geolocation_subscription_.reset();
 124
 125   OnLocationUpdate(position_override_);
 126 }
 127
 128 void GeolocationServiceImpl::ClearOverride() {
 129   position_override_ = Geoposition();
 130   StartListeningForUpdates();
 131 }
 132
 133 void GeolocationServiceImpl::OnConnectionError() {
 134   context_->ServiceHadConnectionError(this);
 135
 136   // The above call deleted this instance, so the only safe thing to do is
 137   // return.
 138 }
 139
 140 void GeolocationServiceImpl::OnLocationUpdate(const Geoposition& position) {
 141   RecordGeopositionErrorCode(position.error_code);
 142   DCHECK(context_);
 143
 144   if (context_->paused())
 145     return;
 146
 147   update_callback_.Run();
 148
 149   current_position_.valid = position.Validate();
 150   current_position_.latitude = position.latitude;
 151   current_position_.longitude = position.longitude;
 152   current_position_.altitude = position.altitude;
 153   current_position_.accuracy = position.accuracy;
 154   current_position_.altitude_accuracy = position.altitude_accuracy;
 155   current_position_.heading = position.heading;
 156   current_position_.speed = position.speed;
 157   current_position_.timestamp = position.timestamp.ToDoubleT();
 158   current_position_.error_code =
 159       MojoGeoposition::ErrorCode(position.error_code);
 160   current_position_.error_message = position.error_message;
 161
 162   has_position_to_report_ = true;
 163
 164   if (!position_callbacks_.empty())
 165     ReportCurrentPosition();
 166 }
 167
 168 void GeolocationServiceImpl::ReportCurrentPosition() {
 169   for (const auto& callback : position_callbacks_)
 170     callback.Run(current_position_.Clone());
 171   position_callbacks_.clear();
 172   has_position_to_report_ = false;
 173 }
 174
 175 }  // namespace content