summaryrefslogtreecommitdiffstats
path: root/dom/performance/PerformanceTiming.cpp
blob: 97bbcb0ca713fd7acfb6480da937473221bc0c8b (plain)
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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "PerformanceTiming.h"
#include "mozilla/dom/PerformanceTimingBinding.h"

namespace mozilla {
namespace dom {

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(PerformanceTiming, mPerformance)

NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(PerformanceTiming, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(PerformanceTiming, Release)

PerformanceTiming::PerformanceTiming(Performance* aPerformance,
                                     nsITimedChannel* aChannel,
                                     nsIHttpChannel* aHttpChannel,
                                     DOMHighResTimeStamp aZeroTime)
  : mPerformance(aPerformance),
    mFetchStart(0.0),
    mZeroTime(TimerClamping::ReduceMsTimeValue(aZeroTime)),
    mRedirectCount(0),
    mTimingAllowed(true),
    mAllRedirectsSameOrigin(true),
    mInitialized(!!aChannel),
    mReportCrossOriginRedirect(true)
{
  MOZ_ASSERT(aPerformance, "Parent performance object should be provided");

  if (!nsContentUtils::IsPerformanceTimingEnabled()) {
    mZeroTime = 0;
  }

  // The aHttpChannel argument is null if this PerformanceTiming object is
  // being used for navigation timing (which is only relevant for documents).
  // It has a non-null value if this PerformanceTiming object is being used
  // for resource timing, which can include document loads, both toplevel and
  // in subframes, and resources linked from a document.
  if (aHttpChannel) {
    mTimingAllowed = CheckAllowedOrigin(aHttpChannel, aChannel);
    bool redirectsPassCheck = false;
    aChannel->GetAllRedirectsPassTimingAllowCheck(&redirectsPassCheck);
    mReportCrossOriginRedirect = mTimingAllowed && redirectsPassCheck;
  }

  InitializeTimingInfo(aChannel);
}

// Copy the timing info from the channel so we don't need to keep the channel
// alive just to get the timestamps.
void
PerformanceTiming::InitializeTimingInfo(nsITimedChannel* aChannel)
{
  if (aChannel) {
    aChannel->GetAsyncOpen(&mAsyncOpen);
    aChannel->GetAllRedirectsSameOrigin(&mAllRedirectsSameOrigin);
    aChannel->GetRedirectCount(&mRedirectCount);
    aChannel->GetRedirectStart(&mRedirectStart);
    aChannel->GetRedirectEnd(&mRedirectEnd);
    aChannel->GetDomainLookupStart(&mDomainLookupStart);
    aChannel->GetDomainLookupEnd(&mDomainLookupEnd);
    aChannel->GetConnectStart(&mConnectStart);
    aChannel->GetSecureConnectionStart(&mSecureConnectionStart);
    aChannel->GetConnectEnd(&mConnectEnd);
    aChannel->GetRequestStart(&mRequestStart);
    aChannel->GetResponseStart(&mResponseStart);
    aChannel->GetCacheReadStart(&mCacheReadStart);
    aChannel->GetResponseEnd(&mResponseEnd);
    aChannel->GetCacheReadEnd(&mCacheReadEnd);

    // the performance timing api essentially requires that the event timestamps
    // are >= asyncOpen().. but in truth the browser engages in a number of
    // speculative activities that sometimes mean connections and lookups begin
    // earlier. Workaround that here by just using asyncOpen as the minimum
    // timestamp for dns and connection info.
    if (!mAsyncOpen.IsNull()) {
      if (!mDomainLookupStart.IsNull() && mDomainLookupStart < mAsyncOpen) {
        mDomainLookupStart = mAsyncOpen;
      }

      if (!mDomainLookupEnd.IsNull() && mDomainLookupEnd < mAsyncOpen) {
        mDomainLookupEnd = mAsyncOpen;
      }

      if (!mConnectStart.IsNull() && mConnectStart < mAsyncOpen) {
        mConnectStart = mAsyncOpen;
      }

      if (!mSecureConnectionStart.IsNull() && mSecureConnectionStart < mAsyncOpen) {
        mSecureConnectionStart = mAsyncOpen;
      }

      if (!mConnectEnd.IsNull() && mConnectEnd < mAsyncOpen) {
        mConnectEnd = mAsyncOpen;
      }
    }
  }
}

PerformanceTiming::~PerformanceTiming()
{
}

DOMHighResTimeStamp
PerformanceTiming::FetchStartHighRes()
{
  if (!mFetchStart) {
    if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
      return mZeroTime;
    }
    MOZ_ASSERT(!mAsyncOpen.IsNull(), "The fetch start time stamp should always be "
        "valid if the performance timing is enabled");
    mFetchStart = (!mAsyncOpen.IsNull())
        ? TimeStampToDOMHighRes(mAsyncOpen)
        : 0.0;
  }
  return TimerClamping::ReduceMsTimeValue(mFetchStart);
}

DOMTimeMilliSec
PerformanceTiming::FetchStart()
{
  return static_cast<int64_t>(FetchStartHighRes());
}

bool
PerformanceTiming::CheckAllowedOrigin(nsIHttpChannel* aResourceChannel,
                                      nsITimedChannel* aChannel)
{
  if (!IsInitialized()) {
    return false;
  }

  // Check that the current document passes the ckeck.
  nsCOMPtr<nsILoadInfo> loadInfo;
  aResourceChannel->GetLoadInfo(getter_AddRefs(loadInfo));
  if (!loadInfo) {
    return false;
  }

  // TYPE_DOCUMENT loads have no loadingPrincipal.  And that's OK, because we
  // never actually need to have a performance timing entry for TYPE_DOCUMENT
  // loads.
  if (loadInfo->GetExternalContentPolicyType() == nsIContentPolicy::TYPE_DOCUMENT) {
    return false;
  }

  nsCOMPtr<nsIPrincipal> principal = loadInfo->LoadingPrincipal();

  // Check if the resource is either same origin as the page that started
  // the load, or if the response contains the proper Timing-Allow-Origin
  // header with the domain of the page that started the load.
  return aChannel->TimingAllowCheck(principal);
}

bool
PerformanceTiming::TimingAllowed() const
{
  return mTimingAllowed;
}

uint16_t
PerformanceTiming::GetRedirectCount() const
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return 0;
  }
  if (!mAllRedirectsSameOrigin) {
    return 0;
  }
  return mRedirectCount;
}

bool
PerformanceTiming::ShouldReportCrossOriginRedirect() const
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return false;
  }

  // If the redirect count is 0, or if one of the cross-origin
  // redirects doesn't have the proper Timing-Allow-Origin header,
  // then RedirectStart and RedirectEnd will be set to zero
  return (mRedirectCount != 0) && mReportCrossOriginRedirect;
}

/**
 * RedirectStartHighRes() is used by both the navigation timing and the
 * resource timing. Since, navigation timing and resource timing check and
 * interpret cross-domain redirects in a different manner,
 * RedirectStartHighRes() will make no checks for cross-domain redirect.
 * It's up to the consumers of this method (PerformanceTiming::RedirectStart()
 * and PerformanceResourceTiming::RedirectStart() to make such verifications.
 *
 * @return a valid timing if the Performance Timing is enabled
 */
DOMHighResTimeStamp
PerformanceTiming::RedirectStartHighRes()
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return mZeroTime;
  }
  return TimeStampToReducedDOMHighResOrFetchStart(mRedirectStart);
}

DOMTimeMilliSec
PerformanceTiming::RedirectStart()
{
  if (!IsInitialized()) {
    return 0;
  }
  // We have to check if all the redirect URIs had the same origin (since there
  // is no check in RedirectStartHighRes())
  if (mAllRedirectsSameOrigin && mRedirectCount) {
    return static_cast<int64_t>(RedirectStartHighRes());
  }
  return 0;
}

/**
 * RedirectEndHighRes() is used by both the navigation timing and the resource
 * timing. Since, navigation timing and resource timing check and interpret
 * cross-domain redirects in a different manner, RedirectEndHighRes() will make
 * no checks for cross-domain redirect. It's up to the consumers of this method
 * (PerformanceTiming::RedirectEnd() and
 * PerformanceResourceTiming::RedirectEnd() to make such verifications.
 *
 * @return a valid timing if the Performance Timing is enabled
 */
DOMHighResTimeStamp
PerformanceTiming::RedirectEndHighRes()
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return mZeroTime;
  }
  return TimeStampToReducedDOMHighResOrFetchStart(mRedirectEnd);
}

DOMTimeMilliSec
PerformanceTiming::RedirectEnd()
{
  if (!IsInitialized()) {
    return 0;
  }
  // We have to check if all the redirect URIs had the same origin (since there
  // is no check in RedirectEndHighRes())
  if (mAllRedirectsSameOrigin && mRedirectCount) {
    return static_cast<int64_t>(RedirectEndHighRes());
  }
  return 0;
}

DOMHighResTimeStamp
PerformanceTiming::DomainLookupStartHighRes()
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return mZeroTime;
  }
  return TimeStampToReducedDOMHighResOrFetchStart(mDomainLookupStart);
}

DOMTimeMilliSec
PerformanceTiming::DomainLookupStart()
{
  return static_cast<int64_t>(DomainLookupStartHighRes());
}

DOMHighResTimeStamp
PerformanceTiming::DomainLookupEndHighRes()
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return mZeroTime;
  }
  // Bug 1155008 - nsHttpTransaction is racy. Return DomainLookupStart when null
  return mDomainLookupEnd.IsNull() ? DomainLookupStartHighRes()
                                   : TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mDomainLookupEnd));
}

DOMTimeMilliSec
PerformanceTiming::DomainLookupEnd()
{
  return static_cast<int64_t>(DomainLookupEndHighRes());
}

DOMHighResTimeStamp
PerformanceTiming::ConnectStartHighRes()
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return mZeroTime;
  }
  return mConnectStart.IsNull() ? DomainLookupEndHighRes()
                                : TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mConnectStart));
}

DOMTimeMilliSec
PerformanceTiming::ConnectStart()
{
  return static_cast<int64_t>(ConnectStartHighRes());
}

DOMHighResTimeStamp
PerformanceTiming::SecureConnectionStartHighRes()
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return mZeroTime;
  }

  // Round down to the nearest 1ms
  const double maxResolutionMs = 1;
  return mSecureConnectionStart.IsNull()
         ? mZeroTime
         : floor(TimeStampToDOMHighRes(mSecureConnectionStart) / maxResolutionMs) * maxResolutionMs;
}

DOMTimeMilliSec
PerformanceTiming::SecureConnectionStart()
{
  return static_cast<int64_t>(SecureConnectionStartHighRes());
}

DOMHighResTimeStamp
PerformanceTiming::ConnectEndHighRes()
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return mZeroTime;
  }
  // Bug 1155008 - nsHttpTransaction is racy. Return ConnectStart when null
  return mConnectEnd.IsNull() ? ConnectStartHighRes()
                              : TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mConnectEnd));
}

DOMTimeMilliSec
PerformanceTiming::ConnectEnd()
{
  return static_cast<int64_t>(ConnectEndHighRes());
}

DOMHighResTimeStamp
PerformanceTiming::RequestStartHighRes()
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return mZeroTime;
  }
  return TimeStampToReducedDOMHighResOrFetchStart(mRequestStart);
}

DOMTimeMilliSec
PerformanceTiming::RequestStart()
{
  return static_cast<int64_t>(RequestStartHighRes());
}

DOMHighResTimeStamp
PerformanceTiming::ResponseStartHighRes()
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return mZeroTime;
  }
  if (mResponseStart.IsNull() ||
     (!mCacheReadStart.IsNull() && mCacheReadStart < mResponseStart)) {
    mResponseStart = mCacheReadStart;
  }
  return TimeStampToReducedDOMHighResOrFetchStart(mResponseStart);
}

DOMTimeMilliSec
PerformanceTiming::ResponseStart()
{
  return static_cast<int64_t>(ResponseStartHighRes());
}

DOMHighResTimeStamp
PerformanceTiming::ResponseEndHighRes()
{
  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
    return mZeroTime;
  }
  if (mResponseEnd.IsNull() ||
     (!mCacheReadEnd.IsNull() && mCacheReadEnd < mResponseEnd)) {
    mResponseEnd = mCacheReadEnd;
  }
  // Bug 1155008 - nsHttpTransaction is racy. Return ResponseStart when null
  return mResponseEnd.IsNull() ? ResponseStartHighRes()
                               : TimerClamping::ReduceMsTimeValue(TimeStampToDOMHighRes(mResponseEnd));
}

DOMTimeMilliSec
PerformanceTiming::ResponseEnd()
{
  return static_cast<int64_t>(ResponseEndHighRes());
}

bool
PerformanceTiming::IsInitialized() const
{
  return mInitialized;
}

JSObject*
PerformanceTiming::WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto)
{
  return PerformanceTimingBinding::Wrap(cx, this, aGivenProto);
}

} // dom namespace
} // mozilla namespace