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      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 blink::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     blink::WebPreconnectMotivation motivation) {
     28   std::string group =
     29       base::FieldTrialList::FindFullName(kMouseEventPreconnectFieldTrialName);
     30 
     31   switch (motivation) {
     32     case blink::WebPreconnectMotivationLinkMouseDown:
     33       return group == kMouseEventPreconnectFieldTrialMouseDownGroup;
     34     case blink::WebPreconnectMotivationLinkMouseOver:
     35       return group == kMouseEventPreconnectFieldTrialMouseOverGroup;
     36     case blink::WebPreconnectMotivationLinkTapUnconfirmed:
     37       return group == kMouseEventPreconnectFieldTrialTapUnconfirmedGroup;
     38     case blink::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 blink::WebString& hostname) {
     55   if (hostname.isEmpty())
     56     return;
     57 
     58   std::string hostname_utf8 = base::UTF16ToUTF8(hostname);
     59   net_predictor_.Resolve(hostname_utf8.data(), hostname_utf8.length());
     60 }
     61 
     62 void PrescientNetworkingDispatcher::preconnect(
     63     const blink::WebURL& url,
     64     blink::WebPreconnectMotivation motivation) {
     65   if (isPreconnectEnabledForMotivation(motivation))
     66     content::RenderThread::Get()->Send(new ChromeViewHostMsg_Preconnect(url));
     67 }
     68 
     69