Partially convert geolocation IPC to Mojo.

content/browser/geolocation/geolocation_service_impl.cc

+// Copyright 2014 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 "content/browser/geolocation/geolocation_service_impl.h"
+
+#include "base/bind.h"
+#include "base/metrics/histogram.h"
+#include "content/browser/geolocation/geolocation_service_context.h"
+#include "content/public/common/mojo_geoposition.mojom.h"
+
+namespace content {
+
+namespace {
+
+// Geoposition error codes for reporting in UMA.
+enum GeopositionErrorCode {
+  // NOTE: Do not renumber these as that would confuse interpretation of
+  // previously logged data. When making changes, also update the enum list
+  // in tools/metrics/histograms/histograms.xml to keep it in sync.
+
+  // There was no error.
+  GEOPOSITION_ERROR_CODE_NONE = 0,
+
+  // User denied use of geolocation.
+  GEOPOSITION_ERROR_CODE_PERMISSION_DENIED = 1,
+
+  // Geoposition could not be determined.
+  GEOPOSITION_ERROR_CODE_POSITION_UNAVAILABLE = 2,
+
+  // Timeout.
+  GEOPOSITION_ERROR_CODE_TIMEOUT = 3,
+
+  // NOTE: Add entries only immediately above this line.
+  GEOPOSITION_ERROR_CODE_COUNT = 4
+};
+
+void RecordGeopositionErrorCode(Geoposition::ErrorCode error_code) {
+  GeopositionErrorCode code = GEOPOSITION_ERROR_CODE_NONE;
+  switch (error_code) {
+    case Geoposition::ERROR_CODE_NONE:
+      code = GEOPOSITION_ERROR_CODE_NONE;
+      break;
+    case Geoposition::ERROR_CODE_PERMISSION_DENIED:
+      code = GEOPOSITION_ERROR_CODE_PERMISSION_DENIED;
+      break;
+    case Geoposition::ERROR_CODE_POSITION_UNAVAILABLE:
+      code = GEOPOSITION_ERROR_CODE_POSITION_UNAVAILABLE;
+      break;
+    case Geoposition::ERROR_CODE_TIMEOUT:
+      code = GEOPOSITION_ERROR_CODE_TIMEOUT;
+      break;
+  }
+  UMA_HISTOGRAM_ENUMERATION("Geolocation.LocationUpdate.ErrorCode",
+                            code,
+                            GEOPOSITION_ERROR_CODE_COUNT);
+}
+
+}  // namespace
+
+GeolocationServiceImpl::GeolocationServiceImpl(
+    GeolocationServiceContext* context,
+    const base::Closure& update_callback)
+    : context_(context),
+      update_callback_(update_callback),
+      client_asked_for_updates_(false) {
+  DCHECK(context_);
+}
+
+GeolocationServiceImpl::~GeolocationServiceImpl() {
+}
+
+void GeolocationServiceImpl::PauseUpdates() {
+  geolocation_subscription_.reset();
+}
+
+void GeolocationServiceImpl::ResumeUpdates() {
+  if (position_override_.Validate()) {
+    OnLocationUpdate(position_override_);
+    return;
+  }
+
+  if (client_asked_for_updates_)
+    StartListeningForUpdates();
+}
+
+void GeolocationServiceImpl::StartListeningForUpdates() {
+  geolocation_subscription_ =
+      GeolocationProvider::GetInstance()->AddLocationUpdateCallback(
+          base::Bind(&GeolocationServiceImpl::OnLocationUpdate,
+                     base::Unretained(this)),
+          high_accuracy_);
+}
+
+void GeolocationServiceImpl::StartUpdating(bool high_accuracy) {
+  UMA_HISTOGRAM_BOOLEAN(
+      "Geolocation.GeolocationDispatcherHostImpl.EnableHighAccuracy",
+      high_accuracy);
+  high_accuracy_ = high_accuracy;
+  client_asked_for_updates_ = true;
+
+  if (position_override_.Validate()) {
+    OnLocationUpdate(position_override_);
+    return;
+  }
+
+  StartListeningForUpdates();
+}
+
+void GeolocationServiceImpl::SetOverride(const Geoposition& position) {
+  position_override_ = position;
+  if (!position_override_.Validate()) {
+    ResumeUpdates();
+  }
+
+  geolocation_subscription_.reset();
+
+  if (client_asked_for_updates_)
+    OnLocationUpdate(position_override_);
+}
+
+void GeolocationServiceImpl::ClearOverride() {
+  position_override_ = Geoposition();
+  ResumeUpdates();
+}
+
+void GeolocationServiceImpl::OnConnectionError() {
+  context_->ServiceHadConnectionError(this);
+
+  // The above call deleted this instance, so the only safe thing to do is
+  // return.
+}
+
+void GeolocationServiceImpl::OnLocationUpdate(const Geoposition& position) {
+  RecordGeopositionErrorCode(position.error_code);
+  DCHECK(context_);
+  DCHECK(client_asked_for_updates_);
+
+  if (context_->paused())
+    return;
+
+  MojoGeopositionPtr geoposition(MojoGeoposition::New());
+  geoposition->valid = position.Validate();
+  geoposition->latitude = position.latitude;
+  geoposition->longitude = position.longitude;
+  geoposition->altitude = position.altitude;
+  geoposition->accuracy = position.accuracy;
+  geoposition->altitude_accuracy = position.altitude_accuracy;
+  geoposition->heading = position.heading;
+  geoposition->speed = position.speed;
+  geoposition->timestamp = position.timestamp.ToDoubleT();
+  geoposition->error_code = MojoGeoposition::ErrorCode(position.error_code);
+  geoposition->error_message = position.error_message;
+
+  update_callback_.Run();
+  client()->OnLocationUpdate(geoposition.Pass());
+}
+
+}  // namespace content