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   DCHECK(context_);
  68 }
  69
  70 GeolocationServiceImpl::~GeolocationServiceImpl() {
  71 }
  72
  73 void GeolocationServiceImpl::PauseUpdates() {
  74   geolocation_subscription_.reset();
  75 }
  76
  77 void GeolocationServiceImpl::ResumeUpdates() {
  78   if (position_override_.Validate()) {
  79     OnLocationUpdate(position_override_);
  80     return;
  81   }
  82
  83   StartListeningForUpdates();
  84 }
  85
  86 void GeolocationServiceImpl::StartListeningForUpdates() {
  87   geolocation_subscription_ =
  88       GeolocationProvider::GetInstance()->AddLocationUpdateCallback(
  89           base::Bind(&GeolocationServiceImpl::OnLocationUpdate,
  90                      base::Unretained(this)),
  91           high_accuracy_);
  92 }
  93
  94 void GeolocationServiceImpl::SetHighAccuracy(bool high_accuracy) {
  95   UMA_HISTOGRAM_BOOLEAN(
  96       "Geolocation.GeolocationDispatcherHostImpl.EnableHighAccuracy",
  97       high_accuracy);
  98   high_accuracy_ = high_accuracy;
  99
 100   if (position_override_.Validate()) {
 101     OnLocationUpdate(position_override_);
 102     return;
 103   }
 104
 105   StartListeningForUpdates();
 106 }
 107
 108 void GeolocationServiceImpl::SetOverride(const Geoposition& position) {
 109   position_override_ = position;
 110   if (!position_override_.Validate()) {
 111     ResumeUpdates();
 112   }
 113
 114   geolocation_subscription_.reset();
 115
 116   OnLocationUpdate(position_override_);
 117 }
 118
 119 void GeolocationServiceImpl::ClearOverride() {
 120   position_override_ = Geoposition();
 121   StartListeningForUpdates();
 122 }
 123
 124 void GeolocationServiceImpl::OnConnectionError() {
 125   context_->ServiceHadConnectionError(this);
 126
 127   // The above call deleted this instance, so the only safe thing to do is
 128   // return.
 129 }
 130
 131 void GeolocationServiceImpl::OnLocationUpdate(const Geoposition& position) {
 132   RecordGeopositionErrorCode(position.error_code);
 133   DCHECK(context_);
 134
 135   if (context_->paused())
 136     return;
 137
 138   MojoGeopositionPtr geoposition(MojoGeoposition::New());
 139   geoposition->valid = position.Validate();
 140   geoposition->latitude = position.latitude;
 141   geoposition->longitude = position.longitude;
 142   geoposition->altitude = position.altitude;
 143   geoposition->accuracy = position.accuracy;
 144   geoposition->altitude_accuracy = position.altitude_accuracy;
 145   geoposition->heading = position.heading;
 146   geoposition->speed = position.speed;
 147   geoposition->timestamp = position.timestamp.ToDoubleT();
 148   geoposition->error_code = MojoGeoposition::ErrorCode(position.error_code);
 149   geoposition->error_message = position.error_message;
 150
 151   update_callback_.Run();
 152   client()->OnLocationUpdate(geoposition.Pass());
 153 }
 154
 155 }  // namespace content