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
|
// Copyright (c) 2016 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 "net/spdy/spdy_header_indexing.h"
#include "net/spdy/spdy_bug_tracker.h"
using base::StringPiece;
namespace net {
int32_t FLAGS_gfe_spdy_indexing_set_bound = 50;
int32_t FLAGS_gfe_spdy_tracking_set_bound = 1000;
HeaderIndexing::HeaderIndexing()
: indexing_set_bound_(FLAGS_gfe_spdy_indexing_set_bound),
tracking_set_bound_(FLAGS_gfe_spdy_tracking_set_bound) {
SPDY_BUG_IF(indexing_set_bound_ >= tracking_set_bound_)
<< "Tracking set should be larger than indexing set";
}
HeaderIndexing::~HeaderIndexing() {}
void HeaderIndexing::CreateInitIndexingHeaders() {
const std::string initial_fields[] = {
// Estimated top 100 fields.
"alt-svc",
"date",
"cache-control",
"content-type",
"expires",
"location",
"x-xss-protection",
"p3p",
"set-cookie",
"alternate-protocol",
"last-modified",
"server",
"x-snapchat-request-id",
"content-disposition",
"strict-transport-security",
"x-content-type-options",
"content-security-policy",
"x-frame-options",
"x-snapchat-notice",
"pragma",
":status",
"content-length",
"etag",
"x-cloud-trace-context",
"vary",
"access-control-expose-headers",
"content-encoding",
"access-control-allow-origin",
"age",
":protocol",
"via",
"x-robots-tag",
"link",
"access-control-allow-headers",
"x-google-session-info",
"x-google-backends",
"x-google-gfe-request-trace",
"warning",
"x-guploader-uploadid",
"x-cup-server-proof",
"timing-allow-origin",
"x-google-trace",
"access-control-allow-credentials",
"google-delayed-impression",
"google-creative-id",
"access-control-allow-methods",
"x-ua-compatible",
"x-google-gfe-response-code-details-trace",
"google-lineitem-id",
"version",
"x-google-dos-service-trace",
"x-google-service",
"x-google-gfe-service-trace",
"sane-time-millis",
"x-google-netmon-label",
"x-google-apiary-auth-scopes",
"x-seed-signature",
"content-security-policy-report-only",
"x-auto-login",
"x-original-content-length",
"accept-ranges",
"x-goog-hash",
"x-google-gfe-response-body-transformations",
"cf-ray",
"x-content-security-policy-report-only",
"x-google-shellfish-status",
"x-amz-id-2",
"get-dictionary",
"grpc-message",
"x-hw",
"x-google-gfe-backend-request-info",
"x-goog-upload-header-x-google-session-info",
"x-amz-cf-id",
"x-powered-by",
"www-authenticate",
"access-control-max-age",
"x-spf-response-type",
"x-goog-meta-encoded_request",
"x-goog-generation",
"x-google-gslb-service",
"x-google-servertype",
"x-cache",
"x-chromium-appcache-fallback-override",
"x-goog-upload-url",
"x-goog-upload-control-url",
"content-range",
"x-seen-by",
"x-google-apps-framework-action",
"content-location",
"x-daystart",
"x-varnish",
"fastly-debug-digest",
"x-daynum",
"x-goog-stored-content-encoding",
"x-goog-storage-class",
"x-google-cookies-blocked",
"x-range-md5",
"x-served-by",
"x-client-wire-protocol",
"content-language",
};
indexing_set_.clear();
indexing_set_ =
HeaderSet(initial_fields, initial_fields + arraysize(initial_fields));
tracking_set_ =
HeaderSet(initial_fields, initial_fields + arraysize(initial_fields));
}
bool HeaderIndexing::ShouldIndex(StringPiece header, StringPiece /* value */) {
total_header_count_++;
if (header.empty()) {
return false;
}
// header is in indexing set.
std::string header_str(header.data(), header.size());
if (indexing_set_.find(header_str) != indexing_set_.end()) {
return true;
}
// header not in indexing set. Check tracking set.
if (tracking_set_.find(header_str) != tracking_set_.end()) {
// Seen this header before. Add it to indexing set.
TryInsertHeader(std::move(header_str), &indexing_set_, indexing_set_bound_);
missed_header_in_tracking_++;
} else {
// Add header to tracking set.
TryInsertHeader(std::move(header_str), &tracking_set_, tracking_set_bound_);
missed_header_in_indexing_++;
}
return false;
}
void HeaderIndexing::TryInsertHeader(std::string&& header,
HeaderSet* set,
size_t bound) {
std::pair<HeaderSet::iterator, bool> result = set->insert(std::move(header));
if (set->size() > bound) {
// Reach the size limit. Remove the header next to the newly added header.
// If the new header is at the end, look for the "next" element at the
// beginning.
HeaderSet::iterator it = std::next(result.first);
if (it != set->end()) {
set->erase(it);
} else {
set->erase(set->begin());
}
}
}
} // namespace net
|
