chrome/browser/net/preconnect.cc

   1 // Copyright (c) 2012 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/browser/net/preconnect.h"
   6
   7 #include "base/bind.h"
   8 #include "base/logging.h"
   9 #include "base/metrics/histogram.h"
  10 #include "content/public/browser/browser_thread.h"
  11 #include "net/http/http_network_session.h"
  12 #include "net/http/http_request_info.h"
  13 #include "net/http/http_stream_factory.h"
  14 #include "net/http/http_transaction_factory.h"
  15 #include "net/log/net_log.h"
  16 #include "net/ssl/ssl_config_service.h"
  17 #include "net/url_request/http_user_agent_settings.h"
  18 #include "net/url_request/url_request_context.h"
  19 #include "net/url_request/url_request_context_getter.h"
  20
  21 using content::BrowserThread;
  22
  23 namespace chrome_browser_net {
  24
  25 void PreconnectOnUIThread(
  26     const GURL& url,
  27     const GURL& first_party_for_cookies,
  28     UrlInfo::ResolutionMotivation motivation,
  29     int count,
  30     net::URLRequestContextGetter* getter) {
  31   // Prewarm connection to Search URL.
  32   BrowserThread::PostTask(
  33       BrowserThread::IO,
  34       FROM_HERE,
  35       base::Bind(&PreconnectOnIOThread, url, first_party_for_cookies,
  36                  motivation, count, make_scoped_refptr(getter)));
  37   return;
  38 }
  39
  40
  41 void PreconnectOnIOThread(
  42     const GURL& url,
  43     const GURL& first_party_for_cookies,
  44     UrlInfo::ResolutionMotivation motivation,
  45     int count,
  46     net::URLRequestContextGetter* getter) {
  47   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
  48     LOG(DFATAL) << "This must be run only on the IO thread.";
  49     return;
  50   }
  51   if (!getter)
  52     return;
  53   // We are now commited to doing the async preconnection call.
  54   UMA_HISTOGRAM_ENUMERATION("Net.PreconnectMotivation", motivation,
  55                             UrlInfo::MAX_MOTIVATED);
  56
  57   net::URLRequestContext* context = getter->GetURLRequestContext();
  58   net::HttpTransactionFactory* factory = context->http_transaction_factory();
  59   net::HttpNetworkSession* session = factory->GetSession();
  60
  61   std::string user_agent;
  62   if (context->http_user_agent_settings())
  63     user_agent = context->http_user_agent_settings()->GetUserAgent();
  64   net::HttpRequestInfo request_info;
  65   request_info.url = url;
  66   request_info.method = "GET";
  67   request_info.extra_headers.SetHeader(net::HttpRequestHeaders::kUserAgent,
  68                                        user_agent);
  69
  70   net::NetworkDelegate* delegate = context->network_delegate();
  71   if (delegate->CanEnablePrivacyMode(url, first_party_for_cookies))
  72     request_info.privacy_mode = net::PRIVACY_MODE_ENABLED;
  73
  74   // Translate the motivation from UrlRequest motivations to HttpRequest
  75   // motivations.
  76   switch (motivation) {
  77     case UrlInfo::OMNIBOX_MOTIVATED:
  78       request_info.motivation = net::HttpRequestInfo::OMNIBOX_MOTIVATED;
  79       break;
  80     case UrlInfo::LEARNED_REFERAL_MOTIVATED:
  81       request_info.motivation = net::HttpRequestInfo::PRECONNECT_MOTIVATED;
  82       break;
  83     case UrlInfo::MOUSE_OVER_MOTIVATED:
  84     case UrlInfo::SELF_REFERAL_MOTIVATED:
  85     case UrlInfo::EARLY_LOAD_MOTIVATED:
  86       request_info.motivation = net::HttpRequestInfo::EARLY_LOAD_MOTIVATED;
  87       break;
  88     default:
  89       // Other motivations should never happen here.
  90       NOTREACHED();
  91       break;
  92   }
  93
  94   // Setup the SSL Configuration.
  95   net::SSLConfig ssl_config;
  96   session->ssl_config_service()->GetSSLConfig(&ssl_config);
  97   session->GetNextProtos(&ssl_config.next_protos);
  98
  99   // All preconnects should perform EV certificate verification.
 100   ssl_config.verify_ev_cert = true;
 101
 102   net::HttpStreamFactory* http_stream_factory = session->http_stream_factory();
 103   http_stream_factory->PreconnectStreams(count, request_info, ssl_config,
 104                                          ssl_config);
 105 }
 106
 107 }  // namespace chrome_browser_net