[CrOS Tether] Update NetworkState to include tether properties and integrate into NetworkStateHandl…

chromeos/components/tether/host_scanner.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 "chromeos/components/tether/host_scanner.h"
 
+#include <algorithm>
+
 #include "base/bind.h"
+#include "chromeos/components/tether/device_id_tether_network_guid_map.h"
 #include "chromeos/components/tether/tether_host_fetcher.h"
 #include "chromeos/network/network_state.h"
 #include "components/cryptauth/remote_device_loader.h"
 
 namespace chromeos {
 
 namespace tether {
 
+namespace {
+
+const char kDefaultCellCarrierName[] = "unknown-carrier";
+
+// Android signal strength is measured between 0 and 4 (inclusive), but Chrome
+// OS signal strength is measured between 0 and 100 (inclusive). In order to
+// convert between Android signal strength to Chrome OS signal strength, the
+// value must be multiplied by the below value.
+const int32_t kAndroidTetherHostToChromeOSSignalStrengthMultiplier = 25;
+
+int32_t ForceBetweenZeroAndOneHundred(int32_t value) {
+  return std::min(std::max(value, 0), 100);
+}
+
+}  // namespace
+
 HostScanner::HostScanner(
     TetherHostFetcher* tether_host_fetcher,
     BleConnectionManager* connection_manager,
     HostScanDevicePrioritizer* host_scan_device_prioritizer,
     NetworkStateHandler* network_state_handler,
-    NotificationPresenter* notification_presenter)
+    NotificationPresenter* notification_presenter,
+    DeviceIdTetherNetworkGuidMap* device_id_tether_network_guid_map)
     : tether_host_fetcher_(tether_host_fetcher),
       connection_manager_(connection_manager),
       host_scan_device_prioritizer_(host_scan_device_prioritizer),
       network_state_handler_(network_state_handler),
       notification_presenter_(notification_presenter),
+      device_id_tether_network_guid_map_(device_id_tether_network_guid_map),
       is_fetching_hosts_(false),
       weak_ptr_factory_(this) {}
 
 HostScanner::~HostScanner() {}
 
 void HostScanner::StartScan() {
   if (host_scanner_operation_) {
     // If a scan is already active, do not continue.
     return;
   }
@@ skipping 22 matching lines @@
   host_scanner_operation_->Initialize();
 }
 
 void HostScanner::OnTetherAvailabilityResponse(
     std::vector<HostScannerOperation::ScannedDeviceInfo>&
         scanned_device_list_so_far,
     bool is_final_scan_result) {
   most_recent_scan_results_ = scanned_device_list_so_far;
 
   if (!scanned_device_list_so_far.empty()) {
-    // TODO (hansberry): Clear out old scanned hosts from NetworkStateHandler.
-    // TODO (hansberry): Add battery and cell strength properties once
-    // available.
+    // TODO(hansberry): Clear out old scanned hosts from NetworkStateHandler.
+    // TODO(khorimoto): Use UpdateTetherNetworkProperties if the network already
+    // exists.
     for (auto& scanned_device_info : scanned_device_list_so_far) {
-      cryptauth::RemoteDevice remote_device = scanned_device_info.remote_device;
-      network_state_handler_->AddTetherNetworkState(remote_device.GetDeviceId(),
-                                                    remote_device.name);
+      const DeviceStatus& status = scanned_device_info.device_status;
+      const cryptauth::RemoteDevice& remote_device =
+          scanned_device_info.remote_device;
+
+      const std::string carrier =
+          (!status.has_cell_provider() || status.cell_provider().empty())
+              ? kDefaultCellCarrierName
+              : status.cell_provider();
+
+      // If battery or signal strength are missing, assume they are 100. For
+      // battery percentage, force the value to be between 0 and 100. For signal
+      // strength, convert from Android signal strength to Chrome OS signal
+      // strength and force the value to be between 0 and 100.
+      const int32_t battery_percentage =
+          status.has_battery_percentage()
+              ? ForceBetweenZeroAndOneHundred(status.battery_percentage())
+              : 100;
+      const int32_t signal_strength =
+          status.has_connection_strength()
+              ? ForceBetweenZeroAndOneHundred(
+                    kAndroidTetherHostToChromeOSSignalStrengthMultiplier *
+                    status.connection_strength())
+              : 100;
+
+      network_state_handler_->AddTetherNetworkState(
+          device_id_tether_network_guid_map_->GetTetherNetworkGuidForDeviceId(
+              remote_device.GetDeviceId()),
+          remote_device.name, carrier, battery_percentage, signal_strength);
     }
 
     if (scanned_device_list_so_far.size() == 1) {
       notification_presenter_->NotifyPotentialHotspotNearby(
           scanned_device_list_so_far.at(0).remote_device);
     } else {
       notification_presenter_->NotifyMultiplePotentialHotspotsNearby();
     }
   }
 
   if (is_final_scan_result) {
     // If the final scan result has been received, the operation is finished.
     // Delete it.
     host_scanner_operation_->RemoveObserver(this);
     host_scanner_operation_.reset();
   }
 }
 
 }  // namespace tether
 
 }  // namespace chromeos