QUIC - Cache the connection type and connection description. Make the

net/quic/network_connection.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 "net/quic/network_connection.h"
+
+#include "net/base/net_util.h"
+
+namespace net {
+
+NetworkConnection::NetworkConnection()
+    : connection_type_(NetworkChangeNotifier::CONNECTION_UNKNOWN),
+      connection_description_(nullptr) {
+}
+
+const char* NetworkConnection::GetDescription() {
+  NetworkChangeNotifier::ConnectionType type =
+      NetworkChangeNotifier::GetConnectionType();
+  if (connection_description_ != nullptr && type == connection_type_)
+    return connection_description_;
+
+  DVLOG(1) << "Updating NetworkConnection's Cached Data";
+
+  connection_description_ = NetworkChangeNotifier::ConnectionTypeToString(type);
+  connection_type_ = type;
+  if (connection_type_ == NetworkChangeNotifier::CONNECTION_UNKNOWN ||
+      connection_type_ == NetworkChangeNotifier::CONNECTION_WIFI) {
+    // This function only seems usefully defined on Windows currently.
+    WifiPHYLayerProtocol wifi_type = GetWifiPHYLayerProtocol();
+    switch (wifi_type) {
+      case WIFI_PHY_LAYER_PROTOCOL_NONE:
+        // No wifi support or no associated AP.
+        break;
+      case WIFI_PHY_LAYER_PROTOCOL_ANCIENT:
+        // An obsolete modes introduced by the original 802.11, e.g. IR, FHSS.
+        connection_description_ = "CONNECTION_WIFI_ANCIENT";
+        break;
+      case WIFI_PHY_LAYER_PROTOCOL_A:
+        // 802.11a, OFDM-based rates.
+        connection_description_ = "CONNECTION_WIFI_802.11a";
+        break;
+      case WIFI_PHY_LAYER_PROTOCOL_B:
+        // 802.11b, DSSS or HR DSSS.
+        connection_description_ = "CONNECTION_WIFI_802.11b";
+        break;
+      case WIFI_PHY_LAYER_PROTOCOL_G:
+        // 802.11g, same rates as 802.11a but compatible with 802.11b.
+        connection_description_ = "CONNECTION_WIFI_802.11g";
+        break;
+      case WIFI_PHY_LAYER_PROTOCOL_N:
+        // 802.11n, HT rates.
+        connection_description_ = "CONNECTION_WIFI_802.11n";
+        break;
+      case WIFI_PHY_LAYER_PROTOCOL_UNKNOWN:
+        // Unclassified mode or failure to identify.
+        break;
+    }
+  }
+  return connection_description_;
+}
+
+void NetworkConnection::Clear() {
+  connection_type_ = NetworkChangeNotifier::CONNECTION_UNKNOWN;
+  connection_description_ = nullptr;
+}
+
+void NetworkConnection::OnIPAddressChanged() {
+  Clear();
+}
+
+void NetworkConnection::OnConnectionTypeChanged(
+    NetworkChangeNotifier::ConnectionType type) {
+  Clear();
+}
+
+}  // namespace net