summaryrefslogtreecommitdiffstats
path: root/dom/workers/WorkerError.cpp
blob: 1b7559921150ce27e99d34a3218d294cfa39cdd3 (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
/* -*- 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 "WorkerError.h"

#include <stdio.h>
#include <algorithm>
#include <utility>
#include "MainThreadUtils.h"
#include "WorkerPrivate.h"
#include "WorkerRunnable.h"
#include "WorkerScope.h"
#include "js/ComparisonOperators.h"
#include "js/UniquePtr.h"
#include "js/friend/ErrorMessages.h"
#include "jsapi.h"
#include "mozilla/ArrayAlgorithm.h"
#include "mozilla/ArrayIterator.h"
#include "mozilla/Assertions.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/RefPtr.h"
#include "mozilla/Span.h"
#include "mozilla/ThreadSafeWeakPtr.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/ErrorEvent.h"
#include "mozilla/dom/ErrorEventBinding.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/EventBinding.h"
#include "mozilla/dom/EventTarget.h"
#include "mozilla/dom/RemoteWorkerChild.h"
#include "mozilla/dom/RemoteWorkerTypes.h"
#include "mozilla/dom/RootedDictionary.h"
#include "mozilla/dom/ServiceWorkerManager.h"
#include "mozilla/dom/ServiceWorkerUtils.h"
#include "mozilla/dom/SimpleGlobalObject.h"
#include "mozilla/dom/Worker.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/dom/WorkerDebuggerGlobalScopeBinding.h"
#include "mozilla/dom/WorkerGlobalScopeBinding.h"
#include "mozilla/fallible.h"
#include "nsCOMPtr.h"
#include "nsDebug.h"
#include "nsGlobalWindowInner.h"
#include "nsIConsoleService.h"
#include "nsIScriptError.h"
#include "nsScriptError.h"
#include "nsServiceManagerUtils.h"
#include "nsString.h"
#include "nsWrapperCacheInlines.h"
#include "nscore.h"
#include "xpcpublic.h"

namespace mozilla::dom {

namespace {

class ReportErrorRunnable final : public WorkerDebuggeeRunnable {
  UniquePtr<WorkerErrorReport> mReport;

 public:
  ReportErrorRunnable(WorkerPrivate* aWorkerPrivate,
                      UniquePtr<WorkerErrorReport> aReport)
      : WorkerDebuggeeRunnable(aWorkerPrivate, "ReportErrorRunnable"),
        mReport(std::move(aReport)) {}

 private:
  virtual void PostDispatch(WorkerPrivate* aWorkerPrivate,
                            bool aDispatchResult) override {
    aWorkerPrivate->AssertIsOnWorkerThread();

    // Dispatch may fail if the worker was canceled, no need to report that as
    // an error, so don't call base class PostDispatch.
  }

  virtual bool WorkerRun(JSContext* aCx,
                         WorkerPrivate* aWorkerPrivate) override {
    uint64_t innerWindowId;
    bool fireAtScope = true;

    bool workerIsAcceptingEvents = aWorkerPrivate->IsAcceptingEvents();

    WorkerPrivate* parent = aWorkerPrivate->GetParent();
    if (parent) {
      innerWindowId = 0;
    } else {
      AssertIsOnMainThread();

      if (aWorkerPrivate->IsSharedWorker()) {
        aWorkerPrivate->GetRemoteWorkerController()
            ->ErrorPropagationOnMainThread(mReport.get(),
                                           /* isErrorEvent */ true);
        return true;
      }

      // Service workers do not have a main thread parent global, so normal
      // worker error reporting will crash.  Instead, pass the error to
      // the ServiceWorkerManager to report on any controlled documents.
      if (aWorkerPrivate->IsServiceWorker()) {
        RefPtr<RemoteWorkerChild> actor(
            aWorkerPrivate->GetRemoteWorkerController());

        Unused << NS_WARN_IF(!actor);

        if (actor) {
          actor->ErrorPropagationOnMainThread(nullptr, false);
        }

        return true;
      }

      // The innerWindowId is only required if we are going to ReportError
      // below, which is gated on this condition. The inner window correctness
      // check is only going to succeed when the worker is accepting events.
      if (workerIsAcceptingEvents) {
        aWorkerPrivate->AssertInnerWindowIsCorrect();
        innerWindowId = aWorkerPrivate->WindowID();
      }
    }

    // Don't fire this event if the JS object has been disconnected from the
    // private object.
    if (!workerIsAcceptingEvents) {
      return true;
    }

    WorkerErrorReport::ReportError(aCx, parent, fireAtScope,
                                   aWorkerPrivate->ParentEventTargetRef(),
                                   std::move(mReport), innerWindowId);
    return true;
  }
};

class ReportGenericErrorRunnable final : public WorkerDebuggeeRunnable {
 public:
  static void CreateAndDispatch(WorkerPrivate* aWorkerPrivate) {
    MOZ_ASSERT(aWorkerPrivate);
    aWorkerPrivate->AssertIsOnWorkerThread();

    RefPtr<ReportGenericErrorRunnable> runnable =
        new ReportGenericErrorRunnable(aWorkerPrivate);
    runnable->Dispatch();
  }

 private:
  explicit ReportGenericErrorRunnable(WorkerPrivate* aWorkerPrivate)
      : WorkerDebuggeeRunnable(aWorkerPrivate, "ReportGenericErrorRunnable") {
    aWorkerPrivate->AssertIsOnWorkerThread();
  }

  void PostDispatch(WorkerPrivate* aWorkerPrivate,
                    bool aDispatchResult) override {
    aWorkerPrivate->AssertIsOnWorkerThread();

    // Dispatch may fail if the worker was canceled, no need to report that as
    // an error, so don't call base class PostDispatch.
  }

  bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
    if (!aWorkerPrivate->IsAcceptingEvents()) {
      return true;
    }

    if (aWorkerPrivate->IsSharedWorker()) {
      aWorkerPrivate->GetRemoteWorkerController()->ErrorPropagationOnMainThread(
          nullptr, false);
      return true;
    }

    if (aWorkerPrivate->IsServiceWorker()) {
      RefPtr<RemoteWorkerChild> actor(
          aWorkerPrivate->GetRemoteWorkerController());

      Unused << NS_WARN_IF(!actor);

      if (actor) {
        actor->ErrorPropagationOnMainThread(nullptr, false);
      }

      return true;
    }

    RefPtr<mozilla::dom::EventTarget> parentEventTarget =
        aWorkerPrivate->ParentEventTargetRef();
    RefPtr<Event> event =
        Event::Constructor(parentEventTarget, u"error"_ns, EventInit());
    event->SetTrusted(true);

    parentEventTarget->DispatchEvent(*event);
    return true;
  }
};

}  // namespace

void WorkerErrorBase::AssignErrorBase(JSErrorBase* aReport) {
  CopyUTF8toUTF16(MakeStringSpan(aReport->filename.c_str()), mFilename);
  mLineNumber = aReport->lineno;
  mColumnNumber = aReport->column.oneOriginValue();
  mErrorNumber = aReport->errorNumber;
}

void WorkerErrorNote::AssignErrorNote(JSErrorNotes::Note* aNote) {
  WorkerErrorBase::AssignErrorBase(aNote);
  xpc::ErrorNote::ErrorNoteToMessageString(aNote, mMessage);
}

WorkerErrorReport::WorkerErrorReport()
    : mIsWarning(false), mExnType(JSEXN_ERR), mMutedError(false) {}

void WorkerErrorReport::AssignErrorReport(JSErrorReport* aReport) {
  WorkerErrorBase::AssignErrorBase(aReport);
  xpc::ErrorReport::ErrorReportToMessageString(aReport, mMessage);

  mLine.Assign(aReport->linebuf(), aReport->linebufLength());
  mIsWarning = aReport->isWarning();
  MOZ_ASSERT(aReport->exnType >= JSEXN_FIRST && aReport->exnType < JSEXN_LIMIT);
  mExnType = JSExnType(aReport->exnType);
  mMutedError = aReport->isMuted;

  if (aReport->notes) {
    if (!mNotes.SetLength(aReport->notes->length(), fallible)) {
      return;
    }

    size_t i = 0;
    for (auto&& note : *aReport->notes) {
      mNotes.ElementAt(i).AssignErrorNote(note.get());
      i++;
    }
  }
}

// aWorkerPrivate is the worker thread we're on (or the main thread, if null)
// aTarget is the worker object that we are going to fire an error at
// (if any).
/* static */
void WorkerErrorReport::ReportError(
    JSContext* aCx, WorkerPrivate* aWorkerPrivate, bool aFireAtScope,
    DOMEventTargetHelper* aTarget, UniquePtr<WorkerErrorReport> aReport,
    uint64_t aInnerWindowId, JS::Handle<JS::Value> aException) {
  if (aWorkerPrivate) {
    aWorkerPrivate->AssertIsOnWorkerThread();
  } else {
    AssertIsOnMainThread();
  }

  // We should not fire error events for warnings but instead make sure that
  // they show up in the error console.
  if (!aReport->mIsWarning) {
    // First fire an ErrorEvent at the worker.
    RootedDictionary<ErrorEventInit> init(aCx);

    if (aReport->mMutedError) {
      init.mMessage.AssignLiteral("Script error.");
    } else {
      init.mMessage = aReport->mMessage;
      init.mFilename = aReport->mFilename;
      init.mLineno = aReport->mLineNumber;
      init.mColno = aReport->mColumnNumber;
      init.mError = aException;
    }

    init.mCancelable = true;
    init.mBubbles = false;

    if (aTarget) {
      RefPtr<ErrorEvent> event =
          ErrorEvent::Constructor(aTarget, u"error"_ns, init);
      event->SetTrusted(true);

      bool defaultActionEnabled =
          aTarget->DispatchEvent(*event, CallerType::System, IgnoreErrors());
      if (!defaultActionEnabled) {
        return;
      }
    }

    // Now fire an event at the global object, but don't do that if the error
    // code is too much recursion and this is the same script threw the error.
    // XXXbz the interaction of this with worker errors seems kinda broken.
    // An overrecursion in the debugger or debugger sandbox will get turned
    // into an error event on our parent worker!
    // https://bugzilla.mozilla.org/show_bug.cgi?id=1271441 tracks making this
    // better.
    if (aFireAtScope &&
        (aTarget || aReport->mErrorNumber != JSMSG_OVER_RECURSED)) {
      JS::Rooted<JSObject*> global(aCx, JS::CurrentGlobalOrNull(aCx));
      NS_ASSERTION(global, "This should never be null!");

      nsEventStatus status = nsEventStatus_eIgnore;

      if (aWorkerPrivate) {
        RefPtr<WorkerGlobalScope> globalScope;
        UNWRAP_OBJECT(WorkerGlobalScope, &global, globalScope);

        if (!globalScope) {
          WorkerDebuggerGlobalScope* globalScope = nullptr;
          UNWRAP_OBJECT(WorkerDebuggerGlobalScope, &global, globalScope);

          MOZ_ASSERT_IF(globalScope,
                        globalScope->GetWrapperPreserveColor() == global);
          if (globalScope || IsWorkerDebuggerSandbox(global)) {
            aWorkerPrivate->ReportErrorToDebugger(
                aReport->mFilename, aReport->mLineNumber, aReport->mMessage);
            return;
          }

          MOZ_ASSERT(SimpleGlobalObject::SimpleGlobalType(global) ==
                     SimpleGlobalObject::GlobalType::BindingDetail);
          // XXXbz We should really log this to console, but unwinding out of
          // this stuff without ending up firing any events is ... hard.  Just
          // return for now.
          // https://bugzilla.mozilla.org/show_bug.cgi?id=1271441 tracks
          // making this better.
          return;
        }

        MOZ_ASSERT(globalScope->GetWrapperPreserveColor() == global);

        RefPtr<ErrorEvent> event =
            ErrorEvent::Constructor(aTarget, u"error"_ns, init);
        event->SetTrusted(true);

        if (NS_FAILED(EventDispatcher::DispatchDOMEvent(
                globalScope, nullptr, event, nullptr, &status))) {
          NS_WARNING("Failed to dispatch worker thread error event!");
          status = nsEventStatus_eIgnore;
        }
      } else if (nsGlobalWindowInner* win = xpc::WindowOrNull(global)) {
        MOZ_ASSERT(NS_IsMainThread());

        if (!win->HandleScriptError(init, &status)) {
          NS_WARNING("Failed to dispatch main thread error event!");
          status = nsEventStatus_eIgnore;
        }
      }

      // Was preventDefault() called?
      if (status == nsEventStatus_eConsumeNoDefault) {
        return;
      }
    }
  }

  // Now fire a runnable to do the same on the parent's thread if we can.
  if (aWorkerPrivate) {
    RefPtr<ReportErrorRunnable> runnable =
        new ReportErrorRunnable(aWorkerPrivate, std::move(aReport));
    runnable->Dispatch();
    return;
  }

  // Otherwise log an error to the error console.
  WorkerErrorReport::LogErrorToConsole(aCx, *aReport, aInnerWindowId);
}

/* static */
void WorkerErrorReport::LogErrorToConsole(JSContext* aCx,
                                          WorkerErrorReport& aReport,
                                          uint64_t aInnerWindowId) {
  JS::Rooted<JSObject*> stack(aCx, aReport.ReadStack(aCx));
  JS::Rooted<JSObject*> stackGlobal(aCx, JS::CurrentGlobalOrNull(aCx));

  ErrorData errorData(
      aReport.mIsWarning, aReport.mLineNumber, aReport.mColumnNumber,
      aReport.mMessage, aReport.mFilename, aReport.mLine,
      TransformIntoNewArray(aReport.mNotes, [](const WorkerErrorNote& note) {
        return ErrorDataNote(note.mLineNumber, note.mColumnNumber,
                             note.mMessage, note.mFilename);
      }));
  LogErrorToConsole(errorData, aInnerWindowId, stack, stackGlobal);
}

/* static */
void WorkerErrorReport::LogErrorToConsole(const ErrorData& aReport,
                                          uint64_t aInnerWindowId,
                                          JS::Handle<JSObject*> aStack,
                                          JS::Handle<JSObject*> aStackGlobal) {
  AssertIsOnMainThread();

  RefPtr<nsScriptErrorBase> scriptError =
      CreateScriptError(nullptr, JS::NothingHandleValue, aStack, aStackGlobal);

  NS_WARNING_ASSERTION(scriptError, "Failed to create script error!");

  if (scriptError) {
    nsAutoCString category("Web Worker");
    uint32_t flags = aReport.isWarning() ? nsIScriptError::warningFlag
                                         : nsIScriptError::errorFlag;
    if (NS_FAILED(scriptError->nsIScriptError::InitWithWindowID(
            aReport.message(), aReport.filename(), aReport.line(),
            aReport.lineNumber(), aReport.columnNumber(), flags, category,
            aInnerWindowId))) {
      NS_WARNING("Failed to init script error!");
      scriptError = nullptr;
    }

    for (const ErrorDataNote& note : aReport.notes()) {
      nsScriptErrorNote* noteObject = new nsScriptErrorNote();
      noteObject->Init(note.message(), note.filename(), 0, note.lineNumber(),
                       note.columnNumber());
      scriptError->AddNote(noteObject);
    }
  }

  nsCOMPtr<nsIConsoleService> consoleService =
      do_GetService(NS_CONSOLESERVICE_CONTRACTID);
  NS_WARNING_ASSERTION(consoleService, "Failed to get console service!");

  if (consoleService) {
    if (scriptError) {
      if (NS_SUCCEEDED(consoleService->LogMessage(scriptError))) {
        return;
      }
      NS_WARNING("LogMessage failed!");
    } else if (NS_SUCCEEDED(consoleService->LogStringMessage(
                   aReport.message().BeginReading()))) {
      return;
    }
    NS_WARNING("LogStringMessage failed!");
  }

  NS_ConvertUTF16toUTF8 msg(aReport.message());
  NS_ConvertUTF16toUTF8 filename(aReport.filename());

  static const char kErrorString[] = "JS error in Web Worker: %s [%s:%u]";

#ifdef ANDROID
  __android_log_print(ANDROID_LOG_INFO, "Gecko", kErrorString, msg.get(),
                      filename.get(), aReport.lineNumber());
#endif

  fprintf(stderr, kErrorString, msg.get(), filename.get(),
          aReport.lineNumber());
  fflush(stderr);
}

/* static */
void WorkerErrorReport::CreateAndDispatchGenericErrorRunnableToParent(
    WorkerPrivate* aWorkerPrivate) {
  ReportGenericErrorRunnable::CreateAndDispatch(aWorkerPrivate);
}

}  // namespace mozilla::dom