[CrOS Tether] Sort Tether network lists.

chromeos/network/network_state_handler.cc

 // Copyright (c) 2012 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/network_state_handler.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 49 matching lines @@
                             state->path().c_str());
 }
 
 std::string ValueAsString(const base::Value& value) {
   std::string vstr;
   base::JSONWriter::WriteWithOptions(
       value, base::JSONWriter::OPTIONS_OMIT_BINARY_VALUES, &vstr);
   return vstr.empty() ? "''" : vstr;
 }
 
+bool ShouldIncludeNetworkInList(const NetworkState* network_state,
+                                bool configured_only,
+                                bool visible_only,
+                                bool get_active) {
+  if (configured_only && !network_state->IsInProfile())
+    return false;
+
+  if (visible_only && !network_state->visible())
+    return false;
+
+  bool is_network_active =
+      network_state->IsConnectedState() || network_state->IsConnectingState();
+  if (is_network_active != get_active)
+    return false;
+
+  if (network_state->type() == shill::kTypeWifi &&
+      !network_state->tether_guid().empty()) {
+    // Wi-Fi networks which are actually underlying Wi-Fi hotspots for a
+    // Tether network should not be included since they should only be shown
+    // to the user as Tether networks.
+    return false;
+  }
+
+  return true;
+}
+
 }  // namespace
 
 const char NetworkStateHandler::kDefaultCheckPortalList[] =
     "ethernet,wifi,cellular";
 
 NetworkStateHandler::NetworkStateHandler() {}
 
 NetworkStateHandler::~NetworkStateHandler() {
   // Normally Shutdown() will get called in ~NetworkHandler, however unit
   // tests do not use that class so this needs to call Shutdown when we
@@ skipping 327 matching lines @@
                        true /* visible_only */, 0 /* no limit */, list);
 }
 
 void NetworkStateHandler::GetVisibleNetworkList(NetworkStateList* list) {
   GetVisibleNetworkListByType(NetworkTypePattern::Default(), list);
 }
 
 void NetworkStateHandler::GetNetworkListByType(const NetworkTypePattern& type,
                                                bool configured_only,
                                                bool visible_only,
-                                               int limit,
+                                               size_t limit,
                                                NetworkStateList* list) {
   DCHECK(list);
   list->clear();
 
-  // Sort the network list if necessary.
+  // If |limit| is 0, there is no limit. Simplify the calculations below by
+  // setting it to the maximum size_t value.
+  if (limit == 0)
+    limit = std::numeric_limits<size_t>::max();
+
   if (!network_list_sorted_)
     SortNetworkList();
 
+  // First, add active Tether networks.
   if (type.MatchesPattern(NetworkTypePattern::Tether()))
-    GetTetherNetworkList(limit, list);
+    AppendTetherNetworksToList(true /* get_active */, limit, list);
 
-  int count = list->size();
-
-  if (type.Equals(NetworkTypePattern::Tether()) ||
-      (limit != 0 && count >= limit)) {
-    // If only searching for Tether networks, there is no need to continue
-    // searching through other network types; likewise, if the limit has already
-    // been reached, there is no need to continue searching.
-    return;
-  }
-
-  for (auto iter = network_list_.begin(); iter != network_list_.end(); ++iter) {
+  // Second, add active non-Tether networks.
+  for (auto iter = network_list_.begin();
+       iter != network_list_.end() && list->size() < limit; ++iter) {
     const NetworkState* network = (*iter)->AsNetworkState();
     DCHECK(network);
     if (!network->update_received() || !network->Matches(type))
       continue;
-    if (configured_only && !network->IsInProfile())
+    if (!ShouldIncludeNetworkInList(network, configured_only, visible_only,
+                                    true /* get_active */)) {
       continue;
-    if (visible_only && !network->visible())
-      continue;
+    }
     if (network->type() == shill::kTypeEthernet) {
       // Ethernet networks should always be in front.
       list->insert(list->begin(), network);
     } else {
       list->push_back(network);
     }
-    if (limit > 0 && ++count >= limit)
-      break;
+  }
+
+  // Third, add inactive Tether networks.
+  if (type.MatchesPattern(NetworkTypePattern::Tether()))
+    AppendTetherNetworksToList(false /* get_active */, limit, list);
+
+  // Fourth, add inactive non-Tether networks.
+  for (auto iter = network_list_.begin();
+       iter != network_list_.end() && list->size() < limit; ++iter) {
+    const NetworkState* network = (*iter)->AsNetworkState();
+    DCHECK(network);
+    if (!network->update_received() || !network->Matches(type))
+      continue;
+    if (!ShouldIncludeNetworkInList(network, configured_only, visible_only,
+                                    false /* get_active */)) {
+      continue;
+    }
+    list->push_back(network);
   }
 }
 
-void NetworkStateHandler::GetTetherNetworkList(int limit,
-                                               NetworkStateList* list) {
+void NetworkStateHandler::AppendTetherNetworksToList(bool get_active,
+                                                     size_t limit,
+                                                     NetworkStateList* list) {
   DCHECK(list);
-  list->clear();
-
+  DCHECK(limit != 0);
   if (!IsTechnologyEnabled(NetworkTypePattern::Tether()))
     return;
 
-  int count = 0;
   for (auto iter = tether_network_list_.begin();
-       iter != tether_network_list_.end(); ++iter) {
-    list->push_back((*iter)->AsNetworkState());
-    if (limit > 0 && ++count >= limit)
-      return;
+       iter != tether_network_list_.end() && list->size() < limit; ++iter) {
+    const NetworkState* network = (*iter)->AsNetworkState();
+    DCHECK(network);
+
+    if (!ShouldIncludeNetworkInList(network, false /* configured_only */,
+                                    false /* visible_only */, get_active)) {
+      continue;
+    }
+
+    list->push_back(network);
   }
 }
 
 const NetworkState* NetworkStateHandler::GetNetworkStateFromServicePath(
     const std::string& service_path,
     bool configured_only) const {
   ManagedState* managed =
       GetModifiableManagedState(&network_list_, service_path);
   if (!managed) {
     managed = GetModifiableManagedState(&tether_network_list_, service_path);
@@ skipping 48 matching lines @@
   tether_network_state->set_visible(true);
   tether_network_state->set_update_received();
   tether_network_state->set_update_requested(false);
   tether_network_state->set_connectable(true);
   tether_network_state->set_carrier(carrier);
   tether_network_state->set_battery_percentage(battery_percentage);
   tether_network_state->set_tether_has_connected_to_host(has_connected_to_host);
   tether_network_state->set_signal_strength(signal_strength);
 
   tether_network_list_.push_back(std::move(tether_network_state));
+  network_list_sorted_ = false;
+
   NotifyNetworkListChanged();
 }
 
 bool NetworkStateHandler::UpdateTetherNetworkProperties(
     const std::string& guid,
     const std::string& carrier,
     int battery_percentage,
     int signal_strength) {
   if (tether_technology_state_ != TECHNOLOGY_ENABLED) {
     NET_LOG(ERROR) << "UpdateTetherNetworkProperties() called when Tether "
                    << "networks are not enabled. Cannot update.";
     return false;
   }
 
   NetworkState* tether_network_state = GetModifiableNetworkStateFromGuid(guid);
   if (!tether_network_state) {
     NET_LOG(ERROR) << "UpdateTetherNetworkProperties(): No NetworkState for "
                    << "Tether network with GUID \"" << guid << "\".";
     return false;
   }
 
   tether_network_state->set_carrier(carrier);
   tether_network_state->set_battery_percentage(battery_percentage);
   tether_network_state->set_signal_strength(signal_strength);
+  network_list_sorted_ = false;
 
   NotifyNetworkPropertiesUpdated(tether_network_state);
   return true;
 }
 
 bool NetworkStateHandler::SetTetherNetworkHasConnectedToHost(
     const std::string& guid) {
   NetworkState* tether_network_state = GetModifiableNetworkStateFromGuid(guid);
   if (!tether_network_state) {
     NET_LOG(ERROR) << "SetTetherNetworkHasConnectedToHost(): No NetworkState "
                    << "for Tether network with GUID \"" << guid << "\".";
     return false;
   }
 
   if (tether_network_state->tether_has_connected_to_host()) {
     return false;
   }
 
   tether_network_state->set_tether_has_connected_to_host(true);
+  network_list_sorted_ = false;
 
   NotifyNetworkPropertiesUpdated(tether_network_state);
   return true;
 }
 
 bool NetworkStateHandler::RemoveTetherNetworkState(const std::string& guid) {
   for (auto iter = tether_network_list_.begin();
        iter != tether_network_list_.end(); ++iter) {
     if (iter->get()->AsNetworkState()->guid() == guid) {
       NetworkState* wifi_network = GetModifiableNetworkStateFromGuid(
@@ skipping 33 matching lines @@
     return false;
   }
 
   if (wifi_network_state->tether_guid().empty() &&
       tether_network_state->tether_guid().empty()) {
     return true;
   }
 
   wifi_network_state->set_tether_guid(std::string());
   tether_network_state->set_tether_guid(std::string());
+  network_list_sorted_ = false;
 
   NotifyNetworkPropertiesUpdated(wifi_network_state);
   NotifyNetworkPropertiesUpdated(tether_network_state);
 
   return true;
 }
 
 bool NetworkStateHandler::AssociateTetherNetworkStateWithWifiNetwork(
     const std::string& tether_network_guid,
     const std::string& wifi_network_guid) {
@@ skipping 27 matching lines @@
     return false;
   }
 
   if (wifi_network_state->tether_guid() == tether_network_guid &&
       tether_network_state->tether_guid() == wifi_network_guid) {
     return true;
   }
 
   tether_network_state->set_tether_guid(wifi_network_guid);
   wifi_network_state->set_tether_guid(tether_network_guid);
+  network_list_sorted_ = false;
 
   NotifyNetworkPropertiesUpdated(wifi_network_state);
   NotifyNetworkPropertiesUpdated(tether_network_state);
 
   return true;
 }
 
 void NetworkStateHandler::SetTetherNetworkStateDisconnected(
     const std::string& guid) {
   SetTetherNetworkStateConnectionState(guid, shill::kStateDisconnect);
@@ skipping 38 matching lines @@
     NET_LOG(ERROR) << "SetTetherNetworkStateConnectionState: Tether network "
                    << "not found: " << guid;
     return;
   }
 
   DCHECK(
       NetworkTypePattern::Tether().MatchesType(tether_network_state->type()));
 
   std::string prev_connection_state = tether_network_state->connection_state();
   tether_network_state->set_connection_state(connection_state);
+  network_list_sorted_ = false;
+
   DCHECK(!tether_network_state->is_captive_portal());
-
   if (ConnectionStateChanged(tether_network_state, prev_connection_state,
                              false /* prev_is_captive_portal */)) {
     NET_LOG(EVENT) << "Changing connection state for Tether network with GUID "
                    << guid << ". Old state: " << prev_connection_state << ", "
                    << "New state: " << connection_state;
 
     OnNetworkConnectionStateChanged(tether_network_state);
     NotifyNetworkPropertiesUpdated(tether_network_state);
   }
 }
@@ skipping 446 matching lines @@
         devices += ", ";
       devices += (*iter)->name();
     }
     NET_LOG_EVENT("DeviceList", devices);
     NotifyDeviceListChanged();
   } else {
     NOTREACHED();
   }
 }
 
-// TODO(khorimoto): Add sorting for the Tether network list as well.
 void NetworkStateHandler::SortNetworkList() {
+  if (tether_sort_delegate_)
+    tether_sort_delegate_->SortTetherNetworkList(&tether_network_list_);
+
   // Note: usually active networks will precede inactive networks, however
   // this may briefly be untrue during state transitions (e.g. a network may
   // transition to idle before the list is updated).
   ManagedStateList active, non_wifi_visible, wifi_visible, hidden, new_networks;
   for (ManagedStateList::iterator iter = network_list_.begin();
        iter != network_list_.end(); ++iter) {
     NetworkState* network = (*iter)->AsNetworkState();
     if (!network->update_received()) {
       new_networks.push_back(std::move(*iter));
       continue;
@@ skipping 320 matching lines @@
   if (type.MatchesType(shill::kTypeVPN))
     technologies.emplace_back(shill::kTypeVPN);
   if (type.MatchesType(kTypeTether))
     technologies.emplace_back(kTypeTether);
 
   CHECK_GT(technologies.size(), 0ul);
   return technologies;
 }
 
 }  // namespace chromeos