Deprecate ShillNetworkClient and add GeolocationHandler

chromeos/network/geolocation_handler.cc

+// Copyright (c) 2013 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 "chromeos/network/geolocation_handler.h"
+
+#include "base/bind.h"
+#include "base/string_number_conversions.h"
+#include "base/values.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/shill_manager_client.h"
+#include "third_party/cros_system_api/dbus/service_constants.h"
+
+namespace chromeos {
+
+static GeolocationHandler* g_geolocation_handler = NULL;
+
+GeolocationHandler::GeolocationHandler()
+    : wifi_enabled_(false),
+      weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
+}
+
+GeolocationHandler::~GeolocationHandler() {
+  ShillManagerClient* manager_client =
+      DBusThreadManager::Get()->GetShillManagerClient();
+  if (manager_client)
+    manager_client->RemovePropertyChangedObserver(this);
+}
+
+void GeolocationHandler::Init() {
+  ShillManagerClient* manager_client =
+      DBusThreadManager::Get()->GetShillManagerClient();
+  manager_client->GetProperties(
+      base::Bind(&GeolocationHandler::ManagerPropertiesCallback,
+                 weak_ptr_factory_.GetWeakPtr()));
+  manager_client->AddPropertyChangedObserver(this);
+}
+
+// static
+void GeolocationHandler::Initialize() {
+  CHECK(!g_geolocation_handler);
+  g_geolocation_handler = new GeolocationHandler();
+  g_geolocation_handler->Init();
+}
+
+// static
+void GeolocationHandler::Shutdown() {
+  CHECK(g_geolocation_handler);
+  delete g_geolocation_handler;
+  g_geolocation_handler = NULL;
+}
+
+// static
+GeolocationHandler* GeolocationHandler::Get() {
+  CHECK(g_geolocation_handler)
+      << "GeolocationHandler::Get() called before Initialize()";
+  return g_geolocation_handler;
+}
+
+bool GeolocationHandler::GetWifiAccessPoints(
+    WifiAccessPointVector* access_points, int64* age_ms) {
+  if (!wifi_enabled_)
+    return false;
+  // Always request updated access points.
+  RequestWifiAccessPoints();
+  // If no data has been received, return false.
+  if (geolocation_received_time_.is_null())
+    return false;
+  if (access_points)
+    *access_points = wifi_access_points_;
+  if (age_ms) {
+    base::TimeDelta dtime = base::Time::Now() - geolocation_received_time_;
+    *age_ms = dtime.InMilliseconds();
+  }
+  return true;
+}
+
+void GeolocationHandler::OnPropertyChanged(const std::string& key,
+                                           const base::Value& value) {
+  HandlePropertyChanged(key, value);
+}
+
+//------------------------------------------------------------------------------
+// Private methods
+
+void GeolocationHandler::ManagerPropertiesCallback(
+    DBusMethodCallStatus call_status,
+    const base::DictionaryValue& properties) {
+  const base::Value* value = NULL;
+  if (properties.Get(flimflam::kEnabledTechnologiesProperty, &value) && value)
+    HandlePropertyChanged(flimflam::kEnabledTechnologiesProperty, *value);
+}
+
+void GeolocationHandler::HandlePropertyChanged(const std::string& key,
+                                               const base::Value& value) {
+  if (key != flimflam::kEnabledTechnologiesProperty)
+    return;
+  const base::ListValue* technologies = NULL;
+  if (!value.GetAsList(&technologies) || !technologies)
+    return;
+  bool wifi_was_enabled = wifi_enabled_;
+  wifi_enabled_ = false;
+  for (base::ListValue::const_iterator iter = technologies->begin();
+       iter != technologies->end(); ++iter) {
+    std::string technology;
+    (*iter)->GetAsString(&technology);
+    if (technology == flimflam::kTypeWifi) {
+      wifi_enabled_ = true;
+      break;
+    }
+  }
+  if (!wifi_was_enabled && wifi_enabled_)
+    RequestWifiAccessPoints();  // Request initial location data.
+}
+
+void GeolocationHandler::RequestWifiAccessPoints() {
+  DBusThreadManager::Get()->GetShillManagerClient()->GetNetworksForGeolocation(
+      base::Bind(&GeolocationHandler::GeolocationCallback,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void GeolocationHandler::GeolocationCallback(
+    DBusMethodCallStatus call_status,
+    const base::DictionaryValue& properties) {
+  if (call_status != DBUS_METHOD_CALL_SUCCESS) {
+    LOG(ERROR) << "Failed to get Geolocation data: " << call_status;
+    return;
+  }
+  wifi_access_points_.clear();
+  if (properties.empty())
+    return;  // No enabled devices, don't update received time.
+
+  // Dictionary<device_type, entry_list>
+  for (base::DictionaryValue::Iterator iter(properties);
+       iter.HasNext(); iter.Advance()) {
+    const base::ListValue* entry_list = NULL;
+    if (!iter.value().GetAsList(&entry_list)) {
+      LOG(WARNING) << "Geolocation dictionary value not a List: " << iter.key();
+      continue;
+    }
+    // List[Dictionary<key, value_str>]
+    for (size_t i = 0; i < entry_list->GetSize(); ++i) {
+      const base::DictionaryValue* entry = NULL;
+      if (!entry_list->GetDictionary(i, &entry) || !entry) {
+        LOG(WARNING) << "Geolocation list value not a Dictionary: " << i;
+        continue;
+      }
+      // Docs: developers.google.com/maps/documentation/business/geolocation
+      WifiAccessPoint wap;
+      entry->GetString(shill::kGeoMacAddressProperty, &wap.mac_address);
+      std::string age_str;
+      if (entry->GetString(shill::kGeoAgeProperty, &age_str)) {
+        int64 age_ms;
+        if (base::StringToInt64(age_str, &age_ms)) {
+          wap.timestamp =
+              base::Time::Now() - base::TimeDelta::FromMilliseconds(age_ms);
+        }
+      }
+      std::string strength_str;
+      if (entry->GetString(shill::kGeoSignalStrengthProperty, &strength_str))
+        base::StringToInt(strength_str, &wap.signal_strength);
+      std::string signal_str;
+      if (entry->GetString(shill::kGeoSignalToNoiseRatioProperty, &signal_str))
+        base::StringToInt(signal_str, &wap.signal_to_noise);
+      std::string channel_str;
+      if (entry->GetString(shill::kGeoChannelProperty, &channel_str))
+        base::StringToInt(channel_str, &wap.channel);
+      wifi_access_points_.push_back(wap);
+    }
+  }
+  geolocation_received_time_ = base::Time::Now();
+}
+
+}  // namespace chromeos