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
|
// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/preloading/search_preload/search_preload_pipeline.h"
#include "chrome/browser/preloading/chrome_preloading.h"
#include "chrome/browser/preloading/prefetch/search_prefetch/search_prefetch_service.h"
#include "chrome/browser/preloading/prerender/prerender_utils.h"
#include "content/public/browser/preloading_trigger_type.h"
#include "content/public/browser/web_contents.h"
#include "net/http/http_no_vary_search_data.h"
#include "third_party/blink/public/mojom/loader/referrer.mojom.h"
SearchPreloadPipeline::SearchPreloadPipeline(GURL canonical_url)
: pipeline_info_(content::PreloadPipelineInfo::Create(
/*planned_max_preloading_type=*/content::PreloadingType::kPrerender)),
canonical_url_(std::move(canonical_url)) {}
SearchPreloadPipeline::~SearchPreloadPipeline() = default;
void SearchPreloadPipeline::UpdateConfidence(content::WebContents& web_contents,
int confidence) {
// Add new prediction when stronger signal arrived.
if (confidence <= confidence_) {
return;
}
confidence_ = confidence;
auto* preloading_data =
content::PreloadingData::GetOrCreateForWebContents(&web_contents);
// Safety: The ownership of this callback will be passed to
// `PreloadingDataImpl`, which has lifetime bounded by `web_contents`. So,
// it's safe to bind `content::BrowserContext*`.
content::PreloadingURLMatchCallback same_url_matcher =
base::BindRepeating(&IsSearchDestinationMatch, canonical_url_,
web_contents.GetBrowserContext());
preloading_data->AddPreloadingPrediction(
chrome_preloading_predictor::kDefaultSearchEngine, confidence,
std::move(same_url_matcher),
web_contents.GetPrimaryMainFrame()->GetPageUkmSourceId());
}
net::HttpNoVarySearchData CreateNoVarySearchHint() {
// TODO(crbug.com/408989409): Get NVS hint from
// //components/search_engines/prepopulated_engines.json
return net::HttpNoVarySearchData::CreateFromVaryParams(
{"q"},
/*vary_on_key_order=*/true);
}
bool SearchPreloadPipeline::StartPrefetch(
content::WebContents& web_contents,
const GURL& prefetch_url,
content::PreloadingPredictor predictor) {
// Don't trigger prefetch if already triggered and is alive.
//
// TODO(crbug.com/394213503): Reconsider the behavior when prefetch is already
// triggered but not alive. Currently, the main reason that a triggered
// prefetch fails for DSE (embedder trigger, no TTL) is the failure of the
// load of the prefetch. (There should be no other timeouts nor expiration.)
// In general, retriggering may be useful.
if (prefetch_handle_) {
return false;
}
auto* preloading_data =
content::PreloadingData::GetOrCreateForWebContents(&web_contents);
// Safety: The ownership of this callback will be passed to
// `PreloadingDataImpl`, which has lifetime bounded by `web_contents`. So,
// it's safe to bind `content::BrowserContext*`.
content::PreloadingURLMatchCallback same_url_matcher =
base::BindRepeating(&IsSearchDestinationMatch, canonical_url_,
web_contents.GetBrowserContext());
content::PreloadingAttempt* attempt = preloading_data->AddPreloadingAttempt(
predictor, content::PreloadingType::kPrefetch,
std::move(same_url_matcher),
/*triggering_primary_page_source_id=*/
web_contents.GetPrimaryMainFrame()->GetPageUkmSourceId());
net::HttpNoVarySearchData no_vary_search_hint = CreateNoVarySearchHint();
// TODO(crbug.com/379140429): Create `preloading_utils` and move common
// preloading histograms suffixes to it.
prefetch_handle_ = web_contents.StartPrefetch(
prefetch_url,
/*use_prefetch_proxy=*/false,
prerender_utils::kDefaultSearchEngineMetricSuffix,
blink::mojom::Referrer(),
/*referring_origin=*/std::nullopt, std::move(no_vary_search_hint),
pipeline_info_, attempt->GetWeakPtr(),
/*holdback_status_override=*/std::nullopt);
return true;
}
void SearchPreloadPipeline::StartPrerender(
content::WebContents& web_contents,
const GURL& prerender_url,
content::PreloadingPredictor predictor) {
// Don't trigger prerender if already triggered.
if (prerender_handle_) {
return;
}
// Assume that prefetch is alive.
if (!IsPrefetchAlive()) {
return;
}
auto* preloading_data =
content::PreloadingData::GetOrCreateForWebContents(&web_contents);
// Safety: The ownership of this callback will be passed to
// `PreloadingDataImpl`, which has lifetime bounded by `web_contents`. So,
// it's safe to bind `content::BrowserContext*`.
content::PreloadingURLMatchCallback same_url_matcher =
base::BindRepeating(&IsSearchDestinationMatch, canonical_url_,
web_contents.GetBrowserContext());
content::PreloadingAttempt* attempt = preloading_data->AddPreloadingAttempt(
predictor, content::PreloadingType::kPrerender,
std::move(same_url_matcher),
/*triggering_primary_page_source_id=*/
web_contents.GetPrimaryMainFrame()->GetPageUkmSourceId());
// Safety: The ownership of this callback will be passed to
// `PrerenderAttributes`, which has lifetime bounded by `web_contents`. So,
// it's safe to bind `content::BrowserContext*`.
base::RepeatingCallback<bool(const GURL&,
const std::optional<content::UrlMatchType>&)>
url_match_predicate =
base::BindRepeating(&IsSearchDestinationMatchWithWebUrlMatchResult,
canonical_url_, web_contents.GetBrowserContext());
prerender_handle_ = web_contents.StartPrerendering(
prerender_url, content::PreloadingTriggerType::kEmbedder,
prerender_utils::kDefaultSearchEngineMetricSuffix,
/*additional_headers=*/net::HttpRequestHeaders(),
/*no_vary_search_hint=*/std::nullopt,
ui::PageTransitionFromInt(ui::PAGE_TRANSITION_GENERATED |
ui::PAGE_TRANSITION_FROM_ADDRESS_BAR),
/*should_warm_up_compositor=*/true,
/*should_prepare_paint_tree=*/true,
content::PreloadingHoldbackStatus::kUnspecified, pipeline_info_, attempt,
std::move(url_match_predicate),
/*prerender_navigation_handle_callback=*/{});
}
bool SearchPreloadPipeline::IsPrefetchAlive() const {
return prefetch_handle_ && prefetch_handle_->IsAlive();
}
|
