summaryrefslogtreecommitdiffstats
path: root/browser/modules/ContentCrashHandlers.sys.mjs
blob: cd8dfc04c60b37f37091f4a258b2d80926e66dc1 (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
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
/* 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/. */

import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";

const lazy = {};

ChromeUtils.defineESModuleGetters(lazy, {
  BrowserWindowTracker: "resource:///modules/BrowserWindowTracker.sys.mjs",
  CrashSubmit: "resource://gre/modules/CrashSubmit.sys.mjs",
  E10SUtils: "resource://gre/modules/E10SUtils.sys.mjs",
  SessionStore: "resource:///modules/sessionstore/SessionStore.sys.mjs",
  clearTimeout: "resource://gre/modules/Timer.sys.mjs",
  setTimeout: "resource://gre/modules/Timer.sys.mjs",
});

// We don't process crash reports older than 28 days, so don't bother
// submitting them
const PENDING_CRASH_REPORT_DAYS = 28;
const DAY = 24 * 60 * 60 * 1000; // milliseconds
const DAYS_TO_SUPPRESS = 30;
const MAX_UNSEEN_CRASHED_CHILD_IDS = 20;
const MAX_UNSEEN_CRASHED_SUBFRAME_IDS = 10;

// Time after which we will begin scanning for unsubmitted crash reports
const CHECK_FOR_UNSUBMITTED_CRASH_REPORTS_DELAY_MS = 60 * 10000; // 10 minutes

// This is SIGUSR1 and indicates a user-invoked crash
const EXIT_CODE_CONTENT_CRASHED = 245;

const TABCRASHED_ICON_URI = "chrome://browser/skin/tab-crashed.svg";

const SUBFRAMECRASH_LEARNMORE_URI =
  "https://support.mozilla.org/kb/firefox-crashes-troubleshoot-prevent-and-get-help";

/**
 * BrowserWeakMap is exactly like a WeakMap, but expects <xul:browser>
 * objects only.
 *
 * Under the hood, BrowserWeakMap keys the map off of the <xul:browser>
 * permanentKey. If, however, the browser has never gotten a permanentKey,
 * it falls back to keying on the <xul:browser> element itself.
 */
class BrowserWeakMap extends WeakMap {
  get(browser) {
    if (browser.permanentKey) {
      return super.get(browser.permanentKey);
    }
    return super.get(browser);
  }

  set(browser, value) {
    if (browser.permanentKey) {
      return super.set(browser.permanentKey, value);
    }
    return super.set(browser, value);
  }

  delete(browser) {
    if (browser.permanentKey) {
      return super.delete(browser.permanentKey);
    }
    return super.delete(browser);
  }
}

export var TabCrashHandler = {
  _crashedTabCount: 0,
  childMap: new Map(),
  browserMap: new BrowserWeakMap(),
  notificationsMap: new Map(),
  unseenCrashedChildIDs: [],
  pendingSubFrameCrashes: new Map(),
  pendingSubFrameCrashesIDs: [],
  crashedBrowserQueues: new Map(),
  restartRequiredBrowsers: new WeakSet(),
  testBuildIDMismatch: false,

  get prefs() {
    delete this.prefs;
    return (this.prefs = Services.prefs.getBranch(
      "browser.tabs.crashReporting."
    ));
  },

  init() {
    if (this.initialized) {
      return;
    }
    this.initialized = true;

    Services.obs.addObserver(this, "ipc:content-shutdown");
    Services.obs.addObserver(this, "oop-frameloader-crashed");
  },

  observe(aSubject, aTopic) {
    switch (aTopic) {
      case "ipc:content-shutdown": {
        aSubject.QueryInterface(Ci.nsIPropertyBag2);

        if (!aSubject.get("abnormal")) {
          return;
        }

        let childID = aSubject.get("childID");
        let dumpID = aSubject.get("dumpID");

        // Get and remove the subframe crash info first.
        let subframeCrashItem = this.getAndRemoveSubframeCrash(childID);

        if (!dumpID) {
          Services.telemetry
            .getHistogramById("FX_CONTENT_CRASH_DUMP_UNAVAILABLE")
            .add(1);
        } else if (AppConstants.MOZ_CRASHREPORTER) {
          this.childMap.set(childID, dumpID);

          // If this is a subframe crash, show the crash notification. Only
          // show subframe notifications when there is a minidump available.
          if (subframeCrashItem) {
            let browsers =
              ChromeUtils.nondeterministicGetWeakMapKeys(subframeCrashItem) ||
              [];
            for (let browserItem of browsers) {
              let browser = subframeCrashItem.get(browserItem);
              if (browser.isConnected && !browser.ownerGlobal.closed) {
                this.showSubFrameNotification(browser, childID, dumpID);
              }
            }
          }
        }

        if (!this.flushCrashedBrowserQueue(childID)) {
          this.unseenCrashedChildIDs.push(childID);
          // The elements in unseenCrashedChildIDs will only be removed if
          // the tab crash page is shown. However, ipc:content-shutdown might
          // be fired for processes for which we'll never show the tab crash
          // page - for example, the thumbnailing process. Another case to
          // consider is if the user is configured to submit backlogged crash
          // reports automatically, and a background tab crashes. In that case,
          // we will never show the tab crash page, and never remove the element
          // from the list.
          //
          // Instead of trying to account for all of those cases, we prevent
          // this list from getting too large by putting a reasonable upper
          // limit on how many childIDs we track. It's unlikely that this
          // array would ever get so large as to be unwieldy (that'd be a lot
          // or crashes!), but a leak is a leak.
          if (
            this.unseenCrashedChildIDs.length > MAX_UNSEEN_CRASHED_CHILD_IDS
          ) {
            this.unseenCrashedChildIDs.shift();
          }
        }

        // check for environment affecting crash reporting
        let shutdown = Services.env.exists("MOZ_CRASHREPORTER_SHUTDOWN");

        if (shutdown) {
          dump(
            "A content process crashed and MOZ_CRASHREPORTER_SHUTDOWN is " +
              "set, shutting down\n"
          );
          Services.startup.quit(
            Ci.nsIAppStartup.eForceQuit,
            EXIT_CODE_CONTENT_CRASHED
          );
        }

        break;
      }
      case "oop-frameloader-crashed": {
        let browser = aSubject.ownerElement;
        if (!browser) {
          return;
        }

        this.browserMap.set(browser, aSubject.childID);
        break;
      }
    }
  },

  /**
   * This should be called once a content process has finished
   * shutting down abnormally. Any tabbrowser browsers that were
   * selected at the time of the crash will then be sent to
   * the crashed tab page.
   *
   * @param childID (int)
   *        The childID of the content process that just crashed.
   * @returns boolean
   *        True if one or more browsers were sent to the tab crashed
   *        page.
   */
  flushCrashedBrowserQueue(childID) {
    let browserQueue = this.crashedBrowserQueues.get(childID);
    if (!browserQueue) {
      return false;
    }

    this.crashedBrowserQueues.delete(childID);

    let sentBrowser = false;
    for (let weakBrowser of browserQueue) {
      let browser = weakBrowser.get();
      if (browser) {
        if (
          this.restartRequiredBrowsers.has(browser) ||
          this.testBuildIDMismatch
        ) {
          this.sendToRestartRequiredPage(browser);
        } else {
          this.sendToTabCrashedPage(browser);
        }
        sentBrowser = true;
      }
    }

    return sentBrowser;
  },

  /**
   * Called by a tabbrowser when it notices that its selected browser
   * has crashed. This will queue the browser to show the tab crash
   * page once the content process has finished tearing down.
   *
   * @param browser (<xul:browser>)
   *        The selected browser that just crashed.
   * @param restartRequired (bool)
   *        Whether or not a browser restart is required to recover.
   */
  onSelectedBrowserCrash(browser, restartRequired) {
    if (!browser.isRemoteBrowser) {
      console.error("Selected crashed browser is not remote.");
      return;
    }
    if (!browser.frameLoader) {
      console.error("Selected crashed browser has no frameloader.");
      return;
    }

    let childID = browser.frameLoader.childID;

    let browserQueue = this.crashedBrowserQueues.get(childID);
    if (!browserQueue) {
      browserQueue = [];
      this.crashedBrowserQueues.set(childID, browserQueue);
    }
    // It's probably unnecessary to store this browser as a
    // weak reference, since the content process should complete
    // its teardown in the same tick of the event loop, and then
    // this queue will be flushed. The weak reference is to avoid
    // leaking browsers in case anything goes wrong during this
    // teardown process.
    browserQueue.push(Cu.getWeakReference(browser));

    if (restartRequired) {
      this.restartRequiredBrowsers.add(browser);
    }

    // In the event that the content process failed to launch, then
    // the childID will be 0. In that case, we will never receive
    // a dumpID nor an ipc:content-shutdown observer notification,
    // so we should flush the queue for childID 0 immediately.
    if (childID == 0) {
      this.flushCrashedBrowserQueue(0);
    }
  },

  /**
   * Called by a tabbrowser when it notices that a background browser
   * has crashed. This will flip its remoteness to non-remote, and attempt
   * to revive the crashed tab so that upon selection the tab either shows
   * an error page, or automatically restores.
   *
   * @param browser (<xul:browser>)
   *        The background browser that just crashed.
   * @param restartRequired (bool)
   *        Whether or not a browser restart is required to recover.
   */
  onBackgroundBrowserCrash(browser, restartRequired) {
    if (restartRequired) {
      this.restartRequiredBrowsers.add(browser);
    }

    let gBrowser = browser.getTabBrowser();
    let tab = gBrowser.getTabForBrowser(browser);

    gBrowser.updateBrowserRemoteness(browser, {
      remoteType: lazy.E10SUtils.NOT_REMOTE,
    });

    lazy.SessionStore.reviveCrashedTab(tab);
  },

  /**
   * Called when a subframe crashes. If the dump is available, shows a subframe
   * crashed notification, otherwise waits for one to be available.
   *
   * @param browser (<xul:browser>)
   *        The browser containing the frame that just crashed.
   * @param childId
   *        The id of the process that just crashed.
   */
  async onSubFrameCrash(browser, childID) {
    if (!AppConstants.MOZ_CRASHREPORTER) {
      return;
    }

    // If a crash dump is available, use it. Otherwise, add the child id to the pending
    // subframe crashes list, and wait for the crash "ipc:content-shutdown" notification
    // to get the minidump. If it never arrives, don't show the notification.
    let dumpID = this.childMap.get(childID);
    if (dumpID) {
      this.showSubFrameNotification(browser, childID, dumpID);
    } else {
      let item = this.pendingSubFrameCrashes.get(childID);
      if (!item) {
        item = new BrowserWeakMap();
        this.pendingSubFrameCrashes.set(childID, item);

        // Add the childID to an array that only has room for MAX_UNSEEN_CRASHED_SUBFRAME_IDS
        // items. If there is no more room, pop the oldest off and remove it. This technique
        // is used instead of a timeout.
        if (
          this.pendingSubFrameCrashesIDs.length >=
          MAX_UNSEEN_CRASHED_SUBFRAME_IDS
        ) {
          let idToDelete = this.pendingSubFrameCrashesIDs.shift();
          this.pendingSubFrameCrashes.delete(idToDelete);
        }
        this.pendingSubFrameCrashesIDs.push(childID);
      }
      item.set(browser, browser);
    }
  },

  /**
   * Given a childID, retrieve the subframe crash info for it
   * from the pendingSubFrameCrashes map. The data is removed
   * from the map and returned.
   *
   * @param childID number
   *        childID of the content that crashed.
   * @returns subframe crash info added by previous call to onSubFrameCrash.
   */
  getAndRemoveSubframeCrash(childID) {
    let item = this.pendingSubFrameCrashes.get(childID);
    if (item) {
      this.pendingSubFrameCrashes.delete(childID);
      let idx = this.pendingSubFrameCrashesIDs.indexOf(childID);
      if (idx >= 0) {
        this.pendingSubFrameCrashesIDs.splice(idx, 1);
      }
    }

    return item;
  },

  /**
   * Called to indicate that a subframe within a browser has crashed. A notification
   * bar will be shown.
   *
   * @param browser (<xul:browser>)
   *        The browser containing the frame that just crashed.
   * @param childId
   *        The id of the process that just crashed.
   * @param dumpID
   *        Minidump id of the crash.
   */
  async showSubFrameNotification(browser, childID, dumpID) {
    let gBrowser = browser.getTabBrowser();
    let notificationBox = gBrowser.getNotificationBox(browser);

    const value = "subframe-crashed";
    let notification = notificationBox.getNotificationWithValue(value);
    if (notification) {
      // Don't show multiple notifications for a browser.
      return;
    }

    let closeAllNotifications = () => {
      // Close all other notifications on other tabs that might
      // be open for the same crashed process.
      let existingItem = this.notificationsMap.get(childID);
      if (existingItem) {
        for (let notif of existingItem.slice()) {
          notif.close();
        }
      }
    };

    gBrowser.ownerGlobal.MozXULElement.insertFTLIfNeeded(
      "browser/contentCrash.ftl"
    );

    let buttons = [
      {
        "l10n-id": "crashed-subframe-learnmore-link",
        popup: null,
        link: SUBFRAMECRASH_LEARNMORE_URI,
      },
      {
        "l10n-id": "crashed-subframe-submit",
        popup: null,
        callback: async () => {
          if (dumpID) {
            UnsubmittedCrashHandler.submitReports(
              [dumpID],
              lazy.CrashSubmit.SUBMITTED_FROM_CRASH_TAB
            );
          }
          closeAllNotifications();
        },
      },
    ];

    notification = await notificationBox.appendNotification(
      value,
      {
        label: { "l10n-id": "crashed-subframe-message" },
        image: TABCRASHED_ICON_URI,
        priority: notificationBox.PRIORITY_INFO_MEDIUM,
        eventCallback: eventName => {
          if (eventName == "disconnected") {
            let existingItem = this.notificationsMap.get(childID);
            if (existingItem) {
              let idx = existingItem.indexOf(notification);
              if (idx >= 0) {
                existingItem.splice(idx, 1);
              }

              if (!existingItem.length) {
                this.notificationsMap.delete(childID);
              }
            }
          } else if (eventName == "dismissed") {
            if (dumpID) {
              lazy.CrashSubmit.ignore(dumpID);
              this.childMap.delete(childID);
            }

            closeAllNotifications();
          }
        },
      },
      buttons
    );

    let existingItem = this.notificationsMap.get(childID);
    if (existingItem) {
      existingItem.push(notification);
    } else {
      this.notificationsMap.set(childID, [notification]);
    }
  },

  /**
   * This method is exposed for SessionStore to call if the user selects
   * a tab which will restore on demand. It's possible that the tab
   * is in this state because it recently crashed. If that's the case, then
   * it's also possible that the user has not seen the tab crash page for
   * that particular crash, in which case, we might show it to them instead
   * of restoring the tab.
   *
   * @param browser (<xul:browser>)
   *        A browser from a browser tab that the user has just selected
   *        to restore on demand.
   * @returns (boolean)
   *        True if TabCrashHandler will send the user to the tab crash
   *        page instead.
   */
  willShowCrashedTab(browser) {
    let childID = this.browserMap.get(browser);
    // We will only show the tab crash page if:
    // 1) We are aware that this browser crashed
    // 2) We know we've never shown the tab crash page for the
    //    crash yet
    // 3) The user is not configured to automatically submit backlogged
    //    crash reports. If they are, we'll send the crash report
    //    immediately.
    if (childID && this.unseenCrashedChildIDs.includes(childID)) {
      if (UnsubmittedCrashHandler.autoSubmit) {
        let dumpID = this.childMap.get(childID);
        if (dumpID) {
          UnsubmittedCrashHandler.submitReports(
            [dumpID],
            lazy.CrashSubmit.SUBMITTED_FROM_AUTO
          );
        }
      } else {
        this.sendToTabCrashedPage(browser);
        return true;
      }
    } else if (childID === 0) {
      if (this.restartRequiredBrowsers.has(browser)) {
        this.sendToRestartRequiredPage(browser);
      } else {
        this.sendToTabCrashedPage(browser);
      }
      return true;
    }

    return false;
  },

  sendToRestartRequiredPage(browser) {
    let uri = browser.currentURI;
    let gBrowser = browser.getTabBrowser();
    let tab = gBrowser.getTabForBrowser(browser);
    // The restart required page is non-remote by default.
    gBrowser.updateBrowserRemoteness(browser, {
      remoteType: lazy.E10SUtils.NOT_REMOTE,
    });

    browser.docShell.displayLoadError(Cr.NS_ERROR_BUILDID_MISMATCH, uri, null);
    tab.setAttribute("crashed", true);
    gBrowser.tabContainer.updateTabIndicatorAttr(tab);

    // Make sure to only count once even if there are multiple windows
    // that will all show about:restartrequired.
    if (this._crashedTabCount == 1) {
      Services.telemetry.scalarAdd("dom.contentprocess.buildID_mismatch", 1);
    }
  },

  /**
   * We show a special page to users when a normal browser tab has crashed.
   * This method should be called to send a browser to that page once the
   * process has completely closed.
   *
   * @param browser (<xul:browser>)
   *        The browser that has recently crashed.
   */
  sendToTabCrashedPage(browser) {
    let title = browser.contentTitle;
    let uri = browser.currentURI;
    let gBrowser = browser.getTabBrowser();
    let tab = gBrowser.getTabForBrowser(browser);
    // The tab crashed page is non-remote by default.
    gBrowser.updateBrowserRemoteness(browser, {
      remoteType: lazy.E10SUtils.NOT_REMOTE,
    });

    browser.setAttribute("crashedPageTitle", title);
    browser.docShell.displayLoadError(Cr.NS_ERROR_CONTENT_CRASHED, uri, null);
    browser.removeAttribute("crashedPageTitle");
    tab.setAttribute("crashed", true);
    gBrowser.tabContainer.updateTabIndicatorAttr(tab);
  },

  /**
   * Submits a crash report from about:tabcrashed, if the crash
   * reporter is enabled and a crash report can be found.
   *
   * @param browser
   *        The <xul:browser> that the report was sent from.
   * @param message
   *        Message data with the following properties:
   *
   *        includeURL (bool):
   *          Whether to include the URL that the user was on
   *          in the crashed tab before the crash occurred.
   *        URL (String)
   *          The URL that the user was on in the crashed tab
   *          before the crash occurred.
   *        comments (String):
   *          Any additional comments from the user.
   *
   *        Note that it is expected that all properties are set,
   *        even if they are empty.
   */
  maybeSendCrashReport(browser, message) {
    if (!AppConstants.MOZ_CRASHREPORTER) {
      return;
    }

    if (!message.data.hasReport) {
      // There was no report, so nothing to do.
      return;
    }

    if (message.data.autoSubmit) {
      // The user has opted in to autosubmitted backlogged
      // crash reports in the future.
      UnsubmittedCrashHandler.autoSubmit = true;
    }

    let childID = this.browserMap.get(browser);
    let dumpID = this.childMap.get(childID);
    if (!dumpID) {
      return;
    }

    if (!message.data.sendReport) {
      Services.telemetry
        .getHistogramById("FX_CONTENT_CRASH_NOT_SUBMITTED")
        .add(1);
      this.prefs.setBoolPref("sendReport", false);
      return;
    }

    let { includeURL, comments, URL } = message.data;

    let extraExtraKeyVals = {
      Comments: comments,
      URL,
    };

    // For the entries in extraExtraKeyVals, we only want to submit the
    // extra data values where they are not the empty string.
    for (let key in extraExtraKeyVals) {
      let val = extraExtraKeyVals[key].trim();
      if (!val) {
        delete extraExtraKeyVals[key];
      }
    }

    // URL is special, since it's already been written to extra data by
    // default. In order to make sure we don't send it, we overwrite it
    // with the empty string.
    if (!includeURL) {
      extraExtraKeyVals.URL = "";
    }

    lazy.CrashSubmit.submit(dumpID, lazy.CrashSubmit.SUBMITTED_FROM_CRASH_TAB, {
      recordSubmission: true,
      extraExtraKeyVals,
    }).catch(console.error);

    this.prefs.setBoolPref("sendReport", true);
    this.prefs.setBoolPref("includeURL", includeURL);

    this.childMap.set(childID, null); // Avoid resubmission.
    this.removeSubmitCheckboxesForSameCrash(childID);
  },

  removeSubmitCheckboxesForSameCrash(childID) {
    for (let window of Services.wm.getEnumerator("navigator:browser")) {
      if (!window.gMultiProcessBrowser) {
        continue;
      }

      for (let browser of window.gBrowser.browsers) {
        if (browser.isRemoteBrowser) {
          continue;
        }

        let doc = browser.contentDocument;
        if (!doc.documentURI.startsWith("about:tabcrashed")) {
          continue;
        }

        if (this.browserMap.get(browser) == childID) {
          this.browserMap.delete(browser);
          browser.sendMessageToActor("CrashReportSent", {}, "AboutTabCrashed");
        }
      }
    }
  },

  /**
   * Process a crashed tab loaded into a browser.
   *
   * @param browser
   *        The <xul:browser> containing the page that crashed.
   * @returns crash data
   *        Message data containing information about the crash.
   */
  onAboutTabCrashedLoad(browser) {
    this._crashedTabCount++;

    let window = browser.ownerGlobal;

    // Reset the zoom for the tabcrashed page.
    window.ZoomManager.setZoomForBrowser(browser, 1);

    let childID = this.browserMap.get(browser);
    let index = this.unseenCrashedChildIDs.indexOf(childID);
    if (index != -1) {
      this.unseenCrashedChildIDs.splice(index, 1);
    }

    let dumpID = this.getDumpID(browser);
    if (!dumpID) {
      return {
        hasReport: false,
      };
    }

    let requestAutoSubmit = !UnsubmittedCrashHandler.autoSubmit;
    let sendReport = this.prefs.getBoolPref("sendReport");
    let includeURL = this.prefs.getBoolPref("includeURL");

    let data = {
      hasReport: true,
      sendReport,
      includeURL,
      requestAutoSubmit,
    };

    return data;
  },

  onAboutTabCrashedUnload(browser) {
    if (!this._crashedTabCount) {
      console.error("Can not decrement crashed tab count to below 0");
      return;
    }
    this._crashedTabCount--;

    let childID = this.browserMap.get(browser);

    // Make sure to only count once even if there are multiple windows
    // that will all show about:tabcrashed.
    if (this._crashedTabCount == 0 && childID) {
      Services.telemetry
        .getHistogramById("FX_CONTENT_CRASH_NOT_SUBMITTED")
        .add(1);
    }
  },

  /**
   * For some <xul:browser>, return a crash report dump ID for that browser
   * if we have been informed of one. Otherwise, return null.
   *
   * @param browser (<xul:browser)
   *        The browser to try to get the dump ID for
   * @returns dumpID (String)
   */
  getDumpID(browser) {
    if (!AppConstants.MOZ_CRASHREPORTER) {
      return null;
    }

    return this.childMap.get(this.browserMap.get(browser));
  },

  /**
   * This is intended for TESTING ONLY. It returns the amount of
   * content processes that have crashed such that we're still waiting
   * for dump IDs for their crash reports.
   *
   * For our automated tests, accessing the crashed content process
   * count helps us test the behaviour when content processes crash due
   * to launch failure, since in those cases we should not increase the
   * crashed browser queue (since we never receive dump IDs for launch
   * failures).
   */
  get queuedCrashedBrowsers() {
    return this.crashedBrowserQueues.size;
  },
};

/**
 * This component is responsible for scanning the pending
 * crash report directory for reports, and (if enabled), to
 * prompt the user to submit those reports. It might also
 * submit those reports automatically without prompting if
 * the user has opted in.
 */
export var UnsubmittedCrashHandler = {
  get prefs() {
    delete this.prefs;
    return (this.prefs = Services.prefs.getBranch(
      "browser.crashReports.unsubmittedCheck."
    ));
  },

  get enabled() {
    return this.prefs.getBoolPref("enabled");
  },

  // showingNotification is set to true once a notification
  // is successfully shown, and then set back to false if
  // the notification is dismissed by an action by the user.
  showingNotification: false,
  // suppressed is true if we've determined that we've shown
  // the notification too many times across too many days without
  // user interaction, so we're suppressing the notification for
  // some number of days. See the documentation for
  // shouldShowPendingSubmissionsNotification().
  suppressed: false,

  _checkTimeout: null,

  init() {
    if (this.initialized) {
      return;
    }

    this.initialized = true;

    // UnsubmittedCrashHandler can be initialized but still be disabled.
    // This is intentional, as this makes simulating UnsubmittedCrashHandler's
    // reactions to browser startup and shutdown easier in test automation.
    //
    // UnsubmittedCrashHandler, when initialized but not enabled, is inert.
    if (this.enabled) {
      if (this.prefs.prefHasUserValue("suppressUntilDate")) {
        if (this.prefs.getCharPref("suppressUntilDate") > this.dateString()) {
          // We'll be suppressing any notifications until after suppressedDate,
          // so there's no need to do anything more.
          this.suppressed = true;
          return;
        }

        // We're done suppressing, so we don't need this pref anymore.
        this.prefs.clearUserPref("suppressUntilDate");
      }

      Services.obs.addObserver(this, "profile-before-change");
    }
  },

  uninit() {
    if (!this.initialized) {
      return;
    }

    this.initialized = false;

    if (this._checkTimeout) {
      lazy.clearTimeout(this._checkTimeout);
      this._checkTimeout = null;
    }

    if (!this.enabled) {
      return;
    }

    if (this.suppressed) {
      this.suppressed = false;
      // No need to do any more clean-up, since we were suppressed.
      return;
    }

    if (this.showingNotification) {
      this.prefs.setBoolPref("shutdownWhileShowing", true);
      this.showingNotification = false;
    }

    Services.obs.removeObserver(this, "profile-before-change");
  },

  observe(subject, topic) {
    switch (topic) {
      case "profile-before-change": {
        this.uninit();
        break;
      }
    }
  },

  scheduleCheckForUnsubmittedCrashReports() {
    this._checkTimeout = lazy.setTimeout(() => {
      Services.tm.idleDispatchToMainThread(() => {
        this.checkForUnsubmittedCrashReports();
      });
    }, CHECK_FOR_UNSUBMITTED_CRASH_REPORTS_DELAY_MS);
  },

  /**
   * Scans the profile directory for unsubmitted crash reports
   * within the past PENDING_CRASH_REPORT_DAYS days. If it
   * finds any, it will, if necessary, attempt to open a notification
   * bar to prompt the user to submit them.
   *
   * @returns Promise
   *          Resolves with the <xul:notification> after it tries to
   *          show a notification on the most recent browser window.
   *          If a notification cannot be shown, will resolve with null.
   */
  async checkForUnsubmittedCrashReports() {
    if (!this.enabled || this.suppressed) {
      return null;
    }

    let dateLimit = new Date();
    dateLimit.setDate(dateLimit.getDate() - PENDING_CRASH_REPORT_DAYS);

    let reportIDs = [];
    try {
      reportIDs = await lazy.CrashSubmit.pendingIDs(dateLimit);
    } catch (e) {
      console.error(e);
      return null;
    }

    if (reportIDs.length) {
      if (this.autoSubmit) {
        this.submitReports(reportIDs, lazy.CrashSubmit.SUBMITTED_FROM_AUTO);
      } else if (this.shouldShowPendingSubmissionsNotification()) {
        return this.showPendingSubmissionsNotification(reportIDs);
      }
    }
    return null;
  },

  /**
   * Returns true if the notification should be shown.
   * shouldShowPendingSubmissionsNotification makes this decision
   * by looking at whether or not the user has seen the notification
   * over several days without ever interacting with it. If this occurs
   * too many times, we suppress the notification for DAYS_TO_SUPPRESS
   * days.
   *
   * @returns bool
   */
  shouldShowPendingSubmissionsNotification() {
    if (!this.prefs.prefHasUserValue("shutdownWhileShowing")) {
      return true;
    }

    let shutdownWhileShowing = this.prefs.getBoolPref("shutdownWhileShowing");
    this.prefs.clearUserPref("shutdownWhileShowing");

    if (!this.prefs.prefHasUserValue("lastShownDate")) {
      // This isn't expected, but we're being defensive here. We'll
      // opt for showing the notification in this case.
      return true;
    }

    let lastShownDate = this.prefs.getCharPref("lastShownDate");
    if (this.dateString() > lastShownDate && shutdownWhileShowing) {
      // We're on a newer day then when we last showed the
      // notification without closing it. We don't want to do
      // this too many times, so we'll decrement a counter for
      // this situation. Too many of these, and we'll assume the
      // user doesn't know or care about unsubmitted notifications,
      // and we'll suppress the notification for a while.
      let chances = this.prefs.getIntPref("chancesUntilSuppress");
      if (--chances < 0) {
        // We're out of chances!
        this.prefs.clearUserPref("chancesUntilSuppress");
        // We'll suppress for DAYS_TO_SUPPRESS days.
        let suppressUntil = this.dateString(
          new Date(Date.now() + DAY * DAYS_TO_SUPPRESS)
        );
        this.prefs.setCharPref("suppressUntilDate", suppressUntil);
        return false;
      }
      this.prefs.setIntPref("chancesUntilSuppress", chances);
    }

    return true;
  },

  /**
   * Given an array of unsubmitted crash report IDs, try to open
   * up a notification asking the user to submit them.
   *
   * @param reportIDs (Array<string>)
   *        The Array of report IDs to offer the user to send.
   * @returns The <xul:notification> if one is shown. null otherwise.
   */
  async showPendingSubmissionsNotification(reportIDs) {
    if (!reportIDs.length) {
      return null;
    }

    let notification = await this.show({
      notificationID: "pending-crash-reports",
      reportIDs,
      onAction: () => {
        this.showingNotification = false;
      },
    });

    if (notification) {
      this.showingNotification = true;
      this.prefs.setCharPref("lastShownDate", this.dateString());
    }

    return notification;
  },

  /**
   * Returns a string representation of a Date in the format
   * YYYYMMDD.
   *
   * @param someDate (Date, optional)
   *        The Date to convert to the string. If not provided,
   *        defaults to today's date.
   * @returns String
   */
  dateString(someDate = new Date()) {
    let year = String(someDate.getFullYear()).padStart(4, "0");
    let month = String(someDate.getMonth() + 1).padStart(2, "0");
    let day = String(someDate.getDate()).padStart(2, "0");
    return year + month + day;
  },

  /**
   * Attempts to show a notification bar to the user in the most
   * recent browser window asking them to submit some crash report
   * IDs. If a notification cannot be shown (for example, there
   * is no browser window), this method exits silently.
   *
   * The notification will allow the user to submit their crash
   * reports. If the user dismissed the notification, the crash
   * reports will be marked to be ignored (though they can
   * still be manually submitted via about:crashes).
   *
   * @param JS Object
   *        An Object with the following properties:
   *
   *        notificationID (string)
   *          The ID for the notification to be opened.
   *
   *        reportIDs (Array<string>)
   *          The array of report IDs to offer to the user.
   *
   *        onAction (function, optional)
   *          A callback to fire once the user performs an
   *          action on the notification bar (this includes
   *          dismissing the notification).
   *
   * @returns The <xul:notification> if one is shown. null otherwise.
   */
  show({ notificationID, reportIDs, onAction }) {
    let chromeWin = lazy.BrowserWindowTracker.getTopWindow();
    if (!chromeWin) {
      // Can't show a notification in this case. We'll hopefully
      // get another opportunity to have the user submit their
      // crash reports later.
      return null;
    }

    let notification =
      chromeWin.gNotificationBox.getNotificationWithValue(notificationID);
    if (notification) {
      return null;
    }

    chromeWin.MozXULElement.insertFTLIfNeeded("browser/contentCrash.ftl");

    let buttons = [
      {
        "l10n-id": "pending-crash-reports-send",
        callback: () => {
          this.submitReports(
            reportIDs,
            lazy.CrashSubmit.SUBMITTED_FROM_INFOBAR
          );
          if (onAction) {
            onAction();
          }
        },
      },
      {
        "l10n-id": "pending-crash-reports-always-send",
        callback: () => {
          this.autoSubmit = true;
          this.submitReports(
            reportIDs,
            lazy.CrashSubmit.SUBMITTED_FROM_INFOBAR
          );
          if (onAction) {
            onAction();
          }
        },
      },
      {
        "l10n-id": "pending-crash-reports-view-all",
        callback() {
          chromeWin.openTrustedLinkIn("about:crashes", "tab");
          return true;
        },
      },
    ];

    let eventCallback = eventType => {
      if (eventType == "dismissed") {
        // The user intentionally dismissed the notification,
        // which we interpret as meaning that they don't care
        // to submit the reports. We'll ignore these particular
        // reports going forward.
        reportIDs.forEach(function (reportID) {
          lazy.CrashSubmit.ignore(reportID);
        });
        if (onAction) {
          onAction();
        }
      }
    };

    return chromeWin.gNotificationBox.appendNotification(
      notificationID,
      {
        label: {
          "l10n-id": "pending-crash-reports-message",
          "l10n-args": { reportCount: reportIDs.length },
        },
        image: TABCRASHED_ICON_URI,
        priority: chromeWin.gNotificationBox.PRIORITY_INFO_HIGH,
        eventCallback,
      },
      buttons
    );
  },

  get autoSubmit() {
    return Services.prefs.getBoolPref(
      "browser.crashReports.unsubmittedCheck.autoSubmit2"
    );
  },

  set autoSubmit(val) {
    Services.prefs.setBoolPref(
      "browser.crashReports.unsubmittedCheck.autoSubmit2",
      val
    );
  },

  /**
   * Attempt to submit reports to the crash report server.
   *
   * @param reportIDs (Array<string>)
   *        The array of reportIDs to submit.
   * @param submittedFrom (string)
   *        One of the CrashSubmit.SUBMITTED_FROM_* constants representing
   *        how this crash was submitted.
   */
  submitReports(reportIDs, submittedFrom) {
    for (let reportID of reportIDs) {
      lazy.CrashSubmit.submit(reportID, submittedFrom).catch(console.error);
    }
  },
};