chrome/browser/net/spdyproxy/proxy_advisor.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/browser/net/spdyproxy/proxy_advisor.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/logging.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/prefs/pref_service.h"
  11 #include "base/stl_util.h"
  12 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_settings.h"
  13 #include "chrome/common/chrome_switches.h"
  14 #include "chrome/common/pref_names.h"
  15 #include "content/public/browser/browser_thread.h"
  16 #include "net/base/load_flags.h"
  17 #include "net/base/request_priority.h"
  18 #include "net/http/http_status_code.h"
  19 #include "net/proxy/proxy_info.h"
  20 #include "net/proxy/proxy_service.h"
  21 #include "net/url_request/url_request_context.h"
  22 #include "net/url_request/url_request_context_getter.h"
  23
  24 // Ensure data reduction features are available.
  25 #if !defined(OS_ANDROID) && !defined(OS_IOS)
  26 #error proxy_advisor should only be included in Android or iOS builds.
  27 #endif
  28
  29 using content::BrowserThread;
  30
  31 namespace {
  32 const char kOmniboxMotivation[] = "omnibox";
  33 const char kLowThresholdOmniboxMotivation[] = "low_threshold_omnibox";
  34 const char kStartupDNSMotivation[] = "startup_dns";
  35 const char kEarlyLoadMotivation[] = "early_load";
  36 const char kLearnedReferralMotivation[] = "learned_referral";
  37 const char kLowThresholdLearnedReferralMotivation[] =
  38     "low_threshold_learned_referral";
  39 const char kSelfReferralMotivation[] = "self_referral";
  40 const char kPageScanMotivation[] = "page_scan";
  41
  42 // Maps a ResolutionMotivation to a string for use in the advisory HEAD
  43 // request.
  44 const char* MotivationName(
  45     chrome_browser_net::UrlInfo::ResolutionMotivation motivation,
  46     bool is_preconnect) {
  47   switch (motivation) {
  48     case chrome_browser_net::UrlInfo::OMNIBOX_MOTIVATED:
  49       return
  50           is_preconnect ? kOmniboxMotivation : kLowThresholdOmniboxMotivation;
  51     case chrome_browser_net::UrlInfo::STARTUP_LIST_MOTIVATED:
  52       return kStartupDNSMotivation;
  53     case chrome_browser_net::UrlInfo::EARLY_LOAD_MOTIVATED:
  54       return kEarlyLoadMotivation;
  55     case chrome_browser_net::UrlInfo::LEARNED_REFERAL_MOTIVATED:
  56       return is_preconnect ?
  57           kLearnedReferralMotivation : kLowThresholdLearnedReferralMotivation;
  58     case chrome_browser_net::UrlInfo::SELF_REFERAL_MOTIVATED:
  59       return kSelfReferralMotivation;
  60     case chrome_browser_net::UrlInfo::PAGE_SCAN_MOTIVATED:
  61       return kPageScanMotivation;
  62     default:
  63       // Other motivations should never be passed to here.
  64       NOTREACHED();
  65       break;
  66   }
  67   NOTREACHED();
  68   return "";
  69 }
  70
  71 }  // namespace
  72
  73 ProxyAdvisor::ProxyAdvisor(PrefService* pref_service,
  74                            net::URLRequestContextGetter* context_getter)
  75     : context_getter_(context_getter) {
  76   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  77
  78   // pref_service may be null in mock test subclasses.
  79   if (pref_service) {
  80     proxy_pref_member_.Init(prefs::kSpdyProxyAuthEnabled, pref_service,
  81         base::Bind(&ProxyAdvisor::UpdateProxyState, base::Unretained(this)));
  82     proxy_pref_member_.MoveToThread(
  83         BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
  84   }
  85 }
  86
  87 ProxyAdvisor::~ProxyAdvisor() {
  88   STLDeleteElements(&inflight_requests_);
  89 }
  90
  91 void ProxyAdvisor::OnResponseStarted(net::URLRequest* request) {
  92   const net::URLRequestStatus& status(request->status());
  93   if (!status.is_success()) {
  94     DLOG(WARNING) << "Proxy advisory failed "
  95         << "status:" << status.status()
  96         << " error:" << status.error();
  97   } else if (request->GetResponseCode() != net::HTTP_OK) {
  98     DLOG(WARNING) << "Proxy advisory status: " << request->GetResponseCode();
  99   }
 100   RequestComplete(request);
 101 }
 102
 103 void ProxyAdvisor::OnReadCompleted(net::URLRequest* request, int bytes_read) {
 104   // No-op for now, as we don't care yet.
 105 }
 106
 107 void ProxyAdvisor::Advise(
 108     const GURL& url,
 109     chrome_browser_net::UrlInfo::ResolutionMotivation motivation,
 110     bool is_preconnect) {
 111   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 112
 113   if (!WouldProxyURL(url))
 114     return;
 115
 116   std::string motivation_name(MotivationName(motivation, is_preconnect));
 117   std::string header_value = motivation_name + " " + url.spec();
 118   net::URLRequestContext* context = context_getter_->GetURLRequestContext();
 119   std::string endpoint =
 120       DataReductionProxySettings::GetDataReductionProxyOrigin() + "preconnect";
 121   scoped_ptr<net::URLRequest> request = context->CreateRequest(
 122       GURL(endpoint), net::DEFAULT_PRIORITY, this);
 123   request->set_method("HEAD");
 124   request->SetExtraRequestHeaderByName(
 125       "Proxy-Host-Advisory", header_value, false);
 126   request->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
 127                         net::LOAD_DO_NOT_SAVE_COOKIES |
 128                         net::LOAD_BYPASS_PROXY |
 129                         net::LOAD_DISABLE_CACHE);
 130   net::URLRequest* raw_request = request.get();
 131   inflight_requests_.insert(request.release());
 132   raw_request->Start();
 133 }
 134
 135 // TODO(marq): Move this into DataReductionProxySettings, and add support for
 136 // inspecting the current proxy configs -- if ResolveProxy on |url| can be
 137 // done synchronously, then this is no longer an approximation.
 138 bool ProxyAdvisor::WouldProxyURL(const GURL& url)  {
 139   if (!proxy_pref_member_.GetValue())
 140     return false;
 141
 142   if (url.SchemeIsSecure())
 143     return false;
 144
 145   return true;
 146 }
 147
 148 void ProxyAdvisor::RequestComplete(net::URLRequest* request) {
 149   DCHECK_EQ(1u, inflight_requests_.count(request));
 150   scoped_ptr<net::URLRequest> scoped_request_for_deletion(request);
 151   inflight_requests_.erase(request);
 152   // |scoped_request_for_deletion| will delete |request|
 153 }
 154
 155 void ProxyAdvisor::UpdateProxyState() {
 156   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 157   // Delete all inflight requests. Each request's destructor will call Cancel().
 158   STLDeleteElements(&inflight_requests_);
 159 }