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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
// Copyright (c) 2011 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/prerender/prerender_resource_handler.h"
#include "chrome/browser/net/chrome_url_request_context.h"
#include "chrome/common/resource_response.h"
#include "net/base/load_flags.h"
#include "net/http/http_response_headers.h"
#include "net/url_request/url_request.h"
namespace {
base::Time DefaultGetCurrentTime() {
return base::Time::Now();
}
bool ShouldPrerender(const GURL& url,
const ResourceResponse* response,
PrerenderResourceHandler::GetCurrentTimeFunction get_time,
base::TimeDelta prerender_duration) {
if (!response)
return false;
const ResourceResponseHead& rrh = response->response_head;
if (!url.is_valid())
return false;
if (!rrh.headers)
return false;
if (!(url.SchemeIs("http") || url.SchemeIs("https")))
return false;
if (rrh.mime_type != "text/html")
return false;
if (rrh.headers->response_code() != 200)
return false;
if (rrh.headers->RequiresValidation(
rrh.request_time,
rrh.response_time,
get_time() + prerender_duration))
return false;
return true;
}
} // namespace
PrerenderResourceHandler* PrerenderResourceHandler::MaybeCreate(
const net::URLRequest& request,
ChromeURLRequestContext* context,
ResourceHandler* next_handler) {
if (!context || !context->prerender_manager())
return NULL;
if (!(request.load_flags() & net::LOAD_PREFETCH))
return NULL;
if (request.method() != "GET")
return NULL;
return new PrerenderResourceHandler(next_handler,
context->prerender_manager());
}
PrerenderResourceHandler::PrerenderResourceHandler(
ResourceHandler* next_handler,
PrerenderManager* prerender_manager)
: next_handler_(next_handler),
prerender_manager_(prerender_manager),
ALLOW_THIS_IN_INITIALIZER_LIST(
prerender_callback_(NewCallback(
this, &PrerenderResourceHandler::StartPrerender))),
prerender_duration_(
base::TimeDelta::FromSeconds(kDefaultPrerenderDurationSeconds)),
get_current_time_(&DefaultGetCurrentTime) {
DCHECK(next_handler);
DCHECK(prerender_manager);
}
// This constructor is only used from unit tests.
PrerenderResourceHandler::PrerenderResourceHandler(
ResourceHandler* next_handler,
PrerenderCallback* callback)
: next_handler_(next_handler),
prerender_callback_(callback),
prerender_duration_(
base::TimeDelta::FromSeconds(kDefaultPrerenderDurationSeconds)),
get_current_time_(&DefaultGetCurrentTime) {
DCHECK(next_handler);
DCHECK(callback);
}
PrerenderResourceHandler::~PrerenderResourceHandler() {
}
bool PrerenderResourceHandler::OnUploadProgress(int request_id,
uint64 position,
uint64 size) {
return next_handler_->OnUploadProgress(request_id, position, size);
}
bool PrerenderResourceHandler::OnRequestRedirected(int request_id,
const GURL& url,
ResourceResponse* response,
bool* defer) {
bool will_redirect = next_handler_->OnRequestRedirected(
request_id, url, response, defer);
if (will_redirect) {
alias_urls_.push_back(url);
url_ = url;
}
return will_redirect;
}
bool PrerenderResourceHandler::OnResponseStarted(int request_id,
ResourceResponse* response) {
if (ShouldPrerender(url_,
response,
get_current_time_,
prerender_duration_)) {
BrowserThread::PostTask(
BrowserThread::UI,
FROM_HERE,
NewRunnableMethod(
this,
&PrerenderResourceHandler::RunCallbackFromUIThread,
url_,
alias_urls_));
}
return next_handler_->OnResponseStarted(request_id, response);
}
bool PrerenderResourceHandler::OnWillStart(int request_id,
const GURL& url,
bool* defer) {
bool will_start = next_handler_->OnWillStart(request_id, url, defer);
if (will_start) {
alias_urls_.push_back(url);
url_ = url;
}
return will_start;
}
bool PrerenderResourceHandler::OnWillRead(int request_id,
net::IOBuffer** buf,
int* buf_size,
int min_size) {
return next_handler_->OnWillRead(request_id, buf, buf_size, min_size);
}
bool PrerenderResourceHandler::OnReadCompleted(int request_id,
int* bytes_read) {
return next_handler_->OnReadCompleted(request_id, bytes_read);
}
bool PrerenderResourceHandler::OnResponseCompleted(
int request_id,
const net::URLRequestStatus& status,
const std::string& security_info) {
return next_handler_->OnResponseCompleted(request_id, status, security_info);
}
void PrerenderResourceHandler::OnRequestClosed() {
next_handler_->OnRequestClosed();
}
void PrerenderResourceHandler::RunCallbackFromUIThread(const GURL& url,
const std::vector<GURL>&
alias_urls) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
prerender_callback_->Run(url, alias_urls);
}
void PrerenderResourceHandler::StartPrerender(const GURL& url,
const std::vector<GURL>&
alias_urls) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
prerender_manager_->AddPreload(url, alias_urls);
}
void PrerenderResourceHandler::set_prerender_duration(base::TimeDelta dt) {
prerender_duration_ = dt;
}
void PrerenderResourceHandler::set_get_current_time_function(
GetCurrentTimeFunction get_current_time) {
DCHECK(get_current_time);
get_current_time_ = get_current_time;
}
// Note: this should stay in line with prerendermanager
// static
const int PrerenderResourceHandler::kDefaultPrerenderDurationSeconds = 20;
|
