src/chrome/renderer/net/prescient_networking_dispatcher.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/renderer/net/prescient_networking_dispatcher.h"
   6
   7 #include "base/metrics/field_trial.h"
   8 #include "base/strings/utf_string_conversions.h"
   9 #include "chrome/common/render_messages.h"
  10 #include "content/public/renderer/render_thread.h"
  11
  12 using WebKit::WebPrescientNetworking;
  13
  14 const char kMouseEventPreconnectFieldTrialName[] = "MouseEventPreconnect";
  15 const char kMouseEventPreconnectFieldTrialMouseDownGroup[] = "MouseDown";
  16 const char kMouseEventPreconnectFieldTrialMouseOverGroup[] = "MouseOver";
  17 const char kMouseEventPreconnectFieldTrialTapUnconfirmedGroup[] =
  18     "TapUnconfirmed";
  19 const char kMouseEventPreconnectFieldTrialTapDownGroup[] = "TapDown";
  20
  21 namespace {
  22
  23 // Returns true if preconnect is enabled for given motivation.
  24 // The preconnect via {mouse,gesture} event is enabled for limited userbase
  25 // for Finch field trial.
  26 bool isPreconnectEnabledForMotivation(
  27     WebKit::WebPreconnectMotivation motivation) {
  28   std::string group =
  29       base::FieldTrialList::FindFullName(kMouseEventPreconnectFieldTrialName);
  30
  31   switch (motivation) {
  32     case WebKit::WebPreconnectMotivationLinkMouseDown:
  33       return group == kMouseEventPreconnectFieldTrialMouseDownGroup;
  34     case WebKit::WebPreconnectMotivationLinkMouseOver:
  35       return group == kMouseEventPreconnectFieldTrialMouseOverGroup;
  36     case WebKit::WebPreconnectMotivationLinkTapUnconfirmed:
  37       return group == kMouseEventPreconnectFieldTrialTapUnconfirmedGroup;
  38     case WebKit::WebPreconnectMotivationLinkTapDown:
  39       return group == kMouseEventPreconnectFieldTrialTapDownGroup;
  40     default:
  41       return false;
  42   }
  43 }
  44
  45 } // namespace
  46
  47 PrescientNetworkingDispatcher::PrescientNetworkingDispatcher() {
  48 }
  49
  50 PrescientNetworkingDispatcher::~PrescientNetworkingDispatcher() {
  51 }
  52
  53 void PrescientNetworkingDispatcher::prefetchDNS(
  54     const WebKit::WebString& hostname) {
  55   if (hostname.isEmpty())
  56     return;
  57
  58   std::string hostname_utf8 = UTF16ToUTF8(hostname);
  59   net_predictor_.Resolve(hostname_utf8.data(), hostname_utf8.length());
  60 }
  61
  62 void PrescientNetworkingDispatcher::preconnect(
  63     const WebKit::WebURL& url,
  64     WebKit::WebPreconnectMotivation motivation) {
  65   if (isPreconnectEnabledForMotivation(motivation))
  66     content::RenderThread::Get()->Send(new ChromeViewHostMsg_Preconnect(url));
  67 }
  68