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
189
190
191
192
193
194
195
196
197
198
|
// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/browser/api/web_request/web_request_time_tracker.h"
#include "base/metrics/histogram_macros.h"
#include "base/numerics/safe_conversions.h"
ExtensionWebRequestTimeTracker::RequestTimeLog::RequestTimeLog() = default;
ExtensionWebRequestTimeTracker::RequestTimeLog::~RequestTimeLog() = default;
ExtensionWebRequestTimeTracker::ExtensionWebRequestTimeTracker() = default;
ExtensionWebRequestTimeTracker::~ExtensionWebRequestTimeTracker() = default;
void ExtensionWebRequestTimeTracker::LogRequestStartTime(
int64_t request_id,
const base::TimeTicks& start_time,
bool has_listener,
bool has_extra_headers_listener) {
auto iter = request_time_logs_.find(request_id);
if (iter != request_time_logs_.end()) {
return;
}
RequestTimeLog& log = request_time_logs_[request_id];
log.request_start_time = start_time;
log.has_listener = has_listener;
log.has_extra_headers_listener = has_extra_headers_listener;
}
void ExtensionWebRequestTimeTracker::LogBeforeRequestDispatchTime(
int64_t request_id,
base::TimeTicks dispatch_time) {
auto iter = request_time_logs_.find(request_id);
CHECK(iter != request_time_logs_.end());
iter->second.before_request_listener_dispatch_time = dispatch_time;
}
void ExtensionWebRequestTimeTracker::LogBeforeRequestCompletionTime(
int64_t request_id,
base::TimeTicks completion_time) {
auto iter = request_time_logs_.find(request_id);
if (iter == request_time_logs_.end()) {
// This probably *shouldn't* happen, but there's enough subtlety in handling
// network requests that we handle it gracefully.
return;
}
iter->second.before_request_listener_completion_time = completion_time;
}
void ExtensionWebRequestTimeTracker::LogBeforeRequestDNRStartTime(
int64_t request_id,
base::TimeTicks start_time) {
auto iter = request_time_logs_.find(request_id);
CHECK(iter != request_time_logs_.end());
iter->second.before_request_dnr_start_time = start_time;
}
void ExtensionWebRequestTimeTracker::LogBeforeRequestDNRCompletionTime(
int64_t request_id,
base::TimeTicks completion_time) {
auto iter = request_time_logs_.find(request_id);
CHECK(iter != request_time_logs_.end());
iter->second.before_request_dnr_completion_time = completion_time;
}
void ExtensionWebRequestTimeTracker::LogRequestEndTime(
int64_t request_id,
const base::TimeTicks& end_time) {
auto iter = request_time_logs_.find(request_id);
if (iter == request_time_logs_.end()) {
return;
}
AnalyzeLogRequest(iter->second, end_time);
request_time_logs_.erase(iter);
}
void ExtensionWebRequestTimeTracker::AnalyzeLogRequest(
const RequestTimeLog& log,
const base::TimeTicks& end_time) {
base::TimeDelta request_duration = end_time - log.request_start_time;
if (log.has_listener) {
UMA_HISTOGRAM_TIMES("Extensions.WebRequest.TotalRequestTime",
request_duration);
}
if (log.has_extra_headers_listener) {
UMA_HISTOGRAM_TIMES("Extensions.WebRequest.TotalExtraHeadersRequestTime",
request_duration);
}
if (log.block_duration.is_zero()) {
return;
}
UMA_HISTOGRAM_TIMES("Extensions.WebRequest.TotalBlockingRequestTime",
request_duration);
UMA_HISTOGRAM_TIMES("Extensions.NetworkDelay", log.block_duration);
// Ignore really short requests. Time spent on these is negligible, and any
// extra delay the extension adds is likely to be noise.
constexpr auto kMinRequestTimeToCare = base::Milliseconds(10);
if (request_duration >= kMinRequestTimeToCare) {
const int percentage =
base::ClampRound(log.block_duration / request_duration * 100);
UMA_HISTOGRAM_PERCENTAGE("Extensions.NetworkDelayPercentage", percentage);
}
constexpr int kBucketCount = 50;
// Record the time spent in listeners in onBeforeRequest. Only do this if
// we have a time for both the dispatch and completion time (we may not,
// if the request were canceled).
if (!log.before_request_listener_dispatch_time.is_null() &&
!log.before_request_listener_completion_time.is_null()) {
base::TimeDelta listener_time =
log.before_request_listener_completion_time -
log.before_request_listener_dispatch_time;
// Because the DNR actions are calculated right after the event is
// dispatched, we separate these into different metrics (so that we can
// differentiate between times that include declarativeNetRequest rule
// matching and those that don't).
if (log.before_request_dnr_start_time.is_null()) {
UMA_HISTOGRAM_TIMES(
"Extensions.WebRequest.BeforeRequestListenerEvaluationTime."
"WebRequestOnly",
listener_time);
UMA_HISTOGRAM_CUSTOM_MICROSECONDS_TIMES(
"Extensions.WebRequest."
"BeforeRequestListenerEvaluationTimeInMicroseconds."
"WebRequestOnly",
listener_time, base::Microseconds(1), base::Seconds(30),
kBucketCount);
} else { // Both webRequest and DNR handlers.
UMA_HISTOGRAM_TIMES(
"Extensions.WebRequest.BeforeRequestListenerEvaluationTime."
"WebRequestAndDeclarativeNetRequest",
listener_time);
UMA_HISTOGRAM_CUSTOM_MICROSECONDS_TIMES(
"Extensions.WebRequest."
"BeforeRequestListenerEvaluationTimeInMicroseconds."
"WebRequestAndDeclarativeNetRequest",
listener_time, base::Microseconds(1), base::Seconds(30),
kBucketCount);
}
}
if (!log.before_request_dnr_completion_time.is_null()) {
// Since declarativeNetRequest handlers are evaluated synchronously in the
// same method, if there's a completion time, there should always be a
// start time. (The inverse is not true, since we only log completion time
// if there was at least one relevant action.)
DCHECK(!log.before_request_dnr_start_time.is_null());
base::TimeDelta elapsed_time = log.before_request_dnr_completion_time -
log.before_request_dnr_start_time;
// DeclarativeNetRequest handlers also aren't really affected by webRequest
// listeners, so no need to split up the time depending on whether there
// were webRequest listeners.
UMA_HISTOGRAM_TIMES(
"Extensions.WebRequest."
"BeforeRequestDeclarativeNetRequestEvaluationTime",
elapsed_time);
UMA_HISTOGRAM_CUSTOM_MICROSECONDS_TIMES(
"Extensions.WebRequest."
"BeforeRequestDeclarativeNetRequestEvaluationTimeInMicroseconds",
elapsed_time, base::Microseconds(1), base::Seconds(30), kBucketCount);
}
}
void ExtensionWebRequestTimeTracker::IncrementTotalBlockTime(
int64_t request_id,
const base::TimeDelta& block_time) {
auto iter = request_time_logs_.find(request_id);
if (iter != request_time_logs_.end()) {
iter->second.block_duration += block_time;
}
}
void ExtensionWebRequestTimeTracker::SetRequestCanceled(int64_t request_id) {
// Canceled requests won't actually hit the network, so we can't compare
// their request time to the time spent waiting on the extension. Just ignore
// them.
request_time_logs_.erase(request_id);
}
void ExtensionWebRequestTimeTracker::SetRequestRedirected(int64_t request_id) {
// When a request is redirected, we have no way of knowing how long the
// request would have taken, so we can't say how much an extension slowed
// down this request. Just ignore it.
request_time_logs_.erase(request_id);
}
|
