1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
// Copyright 2013 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 "chrome/browser/net/spdyproxy/proxy_advisor.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/prefs/pref_service.h"
#include "base/stl_util.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/pref_names.h"
#include "components/data_reduction_proxy/browser/data_reduction_proxy_settings.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/load_flags.h"
#include "net/base/request_priority.h"
#include "net/http/http_status_code.h"
#include "net/proxy/proxy_info.h"
#include "net/proxy/proxy_service.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter.h"
// Ensure data reduction features are available.
#if !defined(OS_ANDROID) && !defined(OS_IOS)
#error proxy_advisor should only be included in Android or iOS builds.
#endif
using content::BrowserThread;
using data_reduction_proxy::DataReductionProxySettings;
namespace {
const char kOmniboxMotivation[] = "omnibox";
const char kLowThresholdOmniboxMotivation[] = "low_threshold_omnibox";
const char kStartupDNSMotivation[] = "startup_dns";
const char kEarlyLoadMotivation[] = "early_load";
const char kLearnedReferralMotivation[] = "learned_referral";
const char kLowThresholdLearnedReferralMotivation[] =
"low_threshold_learned_referral";
const char kSelfReferralMotivation[] = "self_referral";
const char kPageScanMotivation[] = "page_scan";
// Maps a ResolutionMotivation to a string for use in the advisory HEAD
// request.
const char* MotivationName(
chrome_browser_net::UrlInfo::ResolutionMotivation motivation,
bool is_preconnect) {
switch (motivation) {
case chrome_browser_net::UrlInfo::OMNIBOX_MOTIVATED:
return
is_preconnect ? kOmniboxMotivation : kLowThresholdOmniboxMotivation;
case chrome_browser_net::UrlInfo::STARTUP_LIST_MOTIVATED:
return kStartupDNSMotivation;
case chrome_browser_net::UrlInfo::EARLY_LOAD_MOTIVATED:
return kEarlyLoadMotivation;
case chrome_browser_net::UrlInfo::LEARNED_REFERAL_MOTIVATED:
return is_preconnect ?
kLearnedReferralMotivation : kLowThresholdLearnedReferralMotivation;
case chrome_browser_net::UrlInfo::SELF_REFERAL_MOTIVATED:
return kSelfReferralMotivation;
case chrome_browser_net::UrlInfo::PAGE_SCAN_MOTIVATED:
return kPageScanMotivation;
default:
// Other motivations should never be passed to here.
NOTREACHED();
break;
}
NOTREACHED();
return "";
}
} // namespace
ProxyAdvisor::ProxyAdvisor(PrefService* pref_service,
net::URLRequestContextGetter* context_getter)
: context_getter_(context_getter) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// pref_service may be null in mock test subclasses.
if (pref_service) {
proxy_pref_member_.Init(
data_reduction_proxy::prefs::kDataReductionProxyEnabled,
pref_service,
base::Bind(&ProxyAdvisor::UpdateProxyState, base::Unretained(this)));
proxy_pref_member_.MoveToThread(
BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
}
}
ProxyAdvisor::~ProxyAdvisor() {
STLDeleteElements(&inflight_requests_);
}
void ProxyAdvisor::OnResponseStarted(net::URLRequest* request) {
const net::URLRequestStatus& status(request->status());
if (!status.is_success()) {
DLOG(WARNING) << "Proxy advisory failed "
<< "status:" << status.status()
<< " error:" << status.error();
} else if (request->GetResponseCode() != net::HTTP_OK) {
DLOG(WARNING) << "Proxy advisory status: " << request->GetResponseCode();
}
RequestComplete(request);
}
void ProxyAdvisor::OnReadCompleted(net::URLRequest* request, int bytes_read) {
// No-op for now, as we don't care yet.
}
void ProxyAdvisor::Advise(
const GURL& url,
chrome_browser_net::UrlInfo::ResolutionMotivation motivation,
bool is_preconnect) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
if (!WouldProxyURL(url))
return;
std::string motivation_name(MotivationName(motivation, is_preconnect));
std::string header_value = motivation_name + " " + url.spec();
net::URLRequestContext* context = context_getter_->GetURLRequestContext();
std::string endpoint =
DataReductionProxySettings::GetDataReductionProxyOrigin() + "preconnect";
scoped_ptr<net::URLRequest> request = context->CreateRequest(
GURL(endpoint), net::DEFAULT_PRIORITY, this, NULL);
request->set_method("HEAD");
request->SetExtraRequestHeaderByName(
"Proxy-Host-Advisory", header_value, false);
request->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
net::LOAD_DO_NOT_SAVE_COOKIES |
net::LOAD_BYPASS_PROXY |
net::LOAD_DISABLE_CACHE);
net::URLRequest* raw_request = request.get();
inflight_requests_.insert(request.release());
raw_request->Start();
}
// TODO(marq): Move this into DataReductionProxySettings, and add support for
// inspecting the current proxy configs -- if ResolveProxy on |url| can be
// done synchronously, then this is no longer an approximation.
bool ProxyAdvisor::WouldProxyURL(const GURL& url) {
if (!proxy_pref_member_.GetValue())
return false;
if (url.SchemeIsSecure())
return false;
return true;
}
void ProxyAdvisor::RequestComplete(net::URLRequest* request) {
DCHECK_EQ(1u, inflight_requests_.count(request));
scoped_ptr<net::URLRequest> scoped_request_for_deletion(request);
inflight_requests_.erase(request);
// |scoped_request_for_deletion| will delete |request|
}
void ProxyAdvisor::UpdateProxyState() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
// Delete all inflight requests. Each request's destructor will call Cancel().
STLDeleteElements(&inflight_requests_);
}
|
