dom/indexedDB/IDBIndex.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "IDBIndex.h"
   8
   9 #include "IDBCursorType.h"
  10 #include "IDBDatabase.h"
  11 #include "IDBEvents.h"
  12 #include "IDBKeyRange.h"
  13 #include "IDBObjectStore.h"
  14 #include "IDBRequest.h"
  15 #include "IDBTransaction.h"
  16 #include "IndexedDatabase.h"
  17 #include "IndexedDatabaseInlines.h"
  18 #include "mozilla/ErrorResult.h"
  19 #include "mozilla/dom/indexedDB/PBackgroundIDBSharedTypes.h"
  20 #include "ProfilerHelpers.h"
  21 #include "ReportInternalError.h"
  22
  23 // Include this last to avoid path problems on Windows.
  24 #include "ActorsChild.h"
  25
  26 namespace mozilla::dom {
  27
  28 using namespace mozilla::dom::indexedDB;
  29
  30 namespace {
  31
  32 MovingNotNull<RefPtr<IDBRequest>> GenerateRequest(JSContext* aCx,
  33                                                   IDBIndex* aIndex) {
  34   MOZ_ASSERT(aIndex);
  35   aIndex->AssertIsOnOwningThread();
  36
  37   auto transaction = aIndex->ObjectStore()->AcquireTransaction();
  38   auto* const database = transaction->Database();
  39
  40   return IDBRequest::Create(aCx, aIndex, database, std::move(transaction));
  41 }
  42
  43 }  // namespace
  44
  45 IDBIndex::IDBIndex(IDBObjectStore* aObjectStore, const IndexMetadata* aMetadata)
  46     : mObjectStore(aObjectStore),
  47       mCachedKeyPath(JS::UndefinedValue()),
  48       mMetadata(aMetadata),
  49       mId(aMetadata->id()),
  50       mRooted(false) {
  51   MOZ_ASSERT(aObjectStore);
  52   aObjectStore->AssertIsOnOwningThread();
  53   MOZ_ASSERT(aMetadata);
  54 }
  55
  56 IDBIndex::~IDBIndex() {
  57   AssertIsOnOwningThread();
  58
  59   if (mRooted) {
  60     mozilla::DropJSObjects(this);
  61   }
  62 }
  63
  64 RefPtr<IDBIndex> IDBIndex::Create(IDBObjectStore* aObjectStore,
  65                                   const IndexMetadata& aMetadata) {
  66   MOZ_ASSERT(aObjectStore);
  67   aObjectStore->AssertIsOnOwningThread();
  68
  69   return new IDBIndex(aObjectStore, &aMetadata);
  70 }
  71
  72 #ifdef DEBUG
  73
  74 void IDBIndex::AssertIsOnOwningThread() const {
  75   MOZ_ASSERT(mObjectStore);
  76   mObjectStore->AssertIsOnOwningThread();
  77 }
  78
  79 #endif  // DEBUG
  80
  81 RefPtr<IDBRequest> IDBIndex::OpenCursor(JSContext* aCx,
  82                                         JS::Handle<JS::Value> aRange,
  83                                         IDBCursorDirection aDirection,
  84                                         ErrorResult& aRv) {
  85   AssertIsOnOwningThread();
  86
  87   return OpenCursorInternal(/* aKeysOnly */ false, aCx, aRange, aDirection,
  88                             aRv);
  89 }
  90
  91 RefPtr<IDBRequest> IDBIndex::OpenKeyCursor(JSContext* aCx,
  92                                            JS::Handle<JS::Value> aRange,
  93                                            IDBCursorDirection aDirection,
  94                                            ErrorResult& aRv) {
  95   AssertIsOnOwningThread();
  96
  97   return OpenCursorInternal(/* aKeysOnly */ true, aCx, aRange, aDirection, aRv);
  98 }
  99
 100 RefPtr<IDBRequest> IDBIndex::Get(JSContext* aCx, JS::Handle<JS::Value> aKey,
 101                                  ErrorResult& aRv) {
 102   AssertIsOnOwningThread();
 103
 104   return GetInternal(/* aKeyOnly */ false, aCx, aKey, aRv);
 105 }
 106
 107 RefPtr<IDBRequest> IDBIndex::GetKey(JSContext* aCx, JS::Handle<JS::Value> aKey,
 108                                     ErrorResult& aRv) {
 109   AssertIsOnOwningThread();
 110
 111   return GetInternal(/* aKeyOnly */ true, aCx, aKey, aRv);
 112 }
 113
 114 RefPtr<IDBRequest> IDBIndex::GetAll(JSContext* aCx, JS::Handle<JS::Value> aKey,
 115                                     const Optional<uint32_t>& aLimit,
 116                                     ErrorResult& aRv) {
 117   AssertIsOnOwningThread();
 118
 119   return GetAllInternal(/* aKeysOnly */ false, aCx, aKey, aLimit, aRv);
 120 }
 121
 122 RefPtr<IDBRequest> IDBIndex::GetAllKeys(JSContext* aCx,
 123                                         JS::Handle<JS::Value> aKey,
 124                                         const Optional<uint32_t>& aLimit,
 125                                         ErrorResult& aRv) {
 126   AssertIsOnOwningThread();
 127
 128   return GetAllInternal(/* aKeysOnly */ true, aCx, aKey, aLimit, aRv);
 129 }
 130
 131 void IDBIndex::RefreshMetadata(bool aMayDelete) {
 132   AssertIsOnOwningThread();
 133   MOZ_ASSERT_IF(mDeletedMetadata, mMetadata == mDeletedMetadata.get());
 134
 135   const auto& indexes = mObjectStore->Spec().indexes();
 136   const auto foundIt = std::find_if(
 137       indexes.cbegin(), indexes.cend(),
 138       [id = Id()](const auto& metadata) { return metadata.id() == id; });
 139   const bool found = foundIt != indexes.cend();
 140
 141   MOZ_ASSERT_IF(!aMayDelete && !mDeletedMetadata, found);
 142
 143   if (found) {
 144     mMetadata = &*foundIt;
 145     MOZ_ASSERT(mMetadata != mDeletedMetadata.get());
 146     mDeletedMetadata = nullptr;
 147   } else {
 148     NoteDeletion();
 149   }
 150 }
 151
 152 void IDBIndex::NoteDeletion() {
 153   AssertIsOnOwningThread();
 154   MOZ_ASSERT(mMetadata);
 155   MOZ_ASSERT(Id() == mMetadata->id());
 156
 157   if (mDeletedMetadata) {
 158     MOZ_ASSERT(mMetadata == mDeletedMetadata.get());
 159     return;
 160   }
 161
 162   mDeletedMetadata = MakeUnique<IndexMetadata>(*mMetadata);
 163
 164   mMetadata = mDeletedMetadata.get();
 165 }
 166
 167 const nsString& IDBIndex::Name() const {
 168   AssertIsOnOwningThread();
 169   MOZ_ASSERT(mMetadata);
 170
 171   return mMetadata->name();
 172 }
 173
 174 void IDBIndex::SetName(const nsAString& aName, ErrorResult& aRv) {
 175   AssertIsOnOwningThread();
 176
 177   const auto& transaction = mObjectStore->TransactionRef();
 178
 179   if (transaction.GetMode() != IDBTransaction::Mode::VersionChange ||
 180       mDeletedMetadata) {
 181     aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
 182     return;
 183   }
 184
 185   if (!transaction.IsActive()) {
 186     aRv.Throw(NS_ERROR_DOM_INDEXEDDB_TRANSACTION_INACTIVE_ERR);
 187     return;
 188   }
 189
 190   if (aName == mMetadata->name()) {
 191     return;
 192   }
 193
 194   // Cache logging string of this index before renaming.
 195   const LoggingString loggingOldIndex(this);
 196
 197   const int64_t indexId = Id();
 198
 199   nsresult rv =
 200       transaction.Database()->RenameIndex(mObjectStore->Id(), indexId, aName);
 201
 202   if (NS_FAILED(rv)) {
 203     aRv.Throw(rv);
 204     return;
 205   }
 206
 207   // Don't do this in the macro because we always need to increment the serial
 208   // number to keep in sync with the parent.
 209   const uint64_t requestSerialNumber = IDBRequest::NextSerialNumber();
 210
 211   IDB_LOG_MARK_CHILD_TRANSACTION_REQUEST(
 212       "database(%s).transaction(%s).objectStore(%s).index(%s)."
 213       "rename(%s)",
 214       "IDBIndex.rename(%.0s%.0s%.0s%.0s%.0s)",
 215       transaction.LoggingSerialNumber(), requestSerialNumber,
 216       IDB_LOG_STRINGIFY(transaction.Database()), IDB_LOG_STRINGIFY(transaction),
 217       IDB_LOG_STRINGIFY(mObjectStore), loggingOldIndex.get(),
 218       IDB_LOG_STRINGIFY(this));
 219
 220   mObjectStore->MutableTransactionRef().RenameIndex(mObjectStore, indexId,
 221                                                     aName);
 222 }
 223
 224 bool IDBIndex::Unique() const {
 225   AssertIsOnOwningThread();
 226   MOZ_ASSERT(mMetadata);
 227
 228   return mMetadata->unique();
 229 }
 230
 231 bool IDBIndex::MultiEntry() const {
 232   AssertIsOnOwningThread();
 233   MOZ_ASSERT(mMetadata);
 234
 235   return mMetadata->multiEntry();
 236 }
 237
 238 bool IDBIndex::LocaleAware() const {
 239   AssertIsOnOwningThread();
 240   MOZ_ASSERT(mMetadata);
 241
 242   return mMetadata->locale().IsEmpty();
 243 }
 244
 245 const indexedDB::KeyPath& IDBIndex::GetKeyPath() const {
 246   AssertIsOnOwningThread();
 247   MOZ_ASSERT(mMetadata);
 248
 249   return mMetadata->keyPath();
 250 }
 251
 252 void IDBIndex::GetLocale(nsString& aLocale) const {
 253   AssertIsOnOwningThread();
 254   MOZ_ASSERT(mMetadata);
 255
 256   if (mMetadata->locale().IsEmpty()) {
 257     SetDOMStringToNull(aLocale);
 258   } else {
 259     CopyASCIItoUTF16(mMetadata->locale(), aLocale);
 260   }
 261 }
 262
 263 const nsCString& IDBIndex::Locale() const {
 264   AssertIsOnOwningThread();
 265   MOZ_ASSERT(mMetadata);
 266
 267   return mMetadata->locale();
 268 }
 269
 270 bool IDBIndex::IsAutoLocale() const {
 271   AssertIsOnOwningThread();
 272   MOZ_ASSERT(mMetadata);
 273
 274   return mMetadata->autoLocale();
 275 }
 276
 277 nsIGlobalObject* IDBIndex::GetParentObject() const {
 278   AssertIsOnOwningThread();
 279
 280   return mObjectStore->GetParentObject();
 281 }
 282
 283 void IDBIndex::GetKeyPath(JSContext* aCx, JS::MutableHandle<JS::Value> aResult,
 284                           ErrorResult& aRv) {
 285   AssertIsOnOwningThread();
 286
 287   if (!mCachedKeyPath.isUndefined()) {
 288     MOZ_ASSERT(mRooted);
 289     aResult.set(mCachedKeyPath);
 290     return;
 291   }
 292
 293   MOZ_ASSERT(!mRooted);
 294
 295   aRv = GetKeyPath().ToJSVal(aCx, mCachedKeyPath);
 296   if (NS_WARN_IF(aRv.Failed())) {
 297     return;
 298   }
 299
 300   if (mCachedKeyPath.isGCThing()) {
 301     mozilla::HoldJSObjects(this);
 302     mRooted = true;
 303   }
 304
 305   aResult.set(mCachedKeyPath);
 306 }
 307
 308 RefPtr<IDBRequest> IDBIndex::GetInternal(bool aKeyOnly, JSContext* aCx,
 309                                          JS::Handle<JS::Value> aKey,
 310                                          ErrorResult& aRv) {
 311   AssertIsOnOwningThread();
 312
 313   if (mDeletedMetadata) {
 314     aRv.Throw(NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR);
 315     return nullptr;
 316   }
 317
 318   const auto& transaction = mObjectStore->TransactionRef();
 319   if (!transaction.IsActive()) {
 320     aRv.Throw(NS_ERROR_DOM_INDEXEDDB_TRANSACTION_INACTIVE_ERR);
 321     return nullptr;
 322   }
 323
 324   RefPtr<IDBKeyRange> keyRange;
 325   IDBKeyRange::FromJSVal(aCx, aKey, &keyRange, aRv);
 326   if (NS_WARN_IF(aRv.Failed())) {
 327     return nullptr;
 328   }
 329
 330   if (!keyRange) {
 331     // Must specify a key or keyRange for get() and getKey().
 332     aRv.Throw(NS_ERROR_DOM_INDEXEDDB_KEY_ERR);
 333     return nullptr;
 334   }
 335
 336   const int64_t objectStoreId = mObjectStore->Id();
 337   const int64_t indexId = Id();
 338
 339   SerializedKeyRange serializedKeyRange;
 340   keyRange->ToSerialized(serializedKeyRange);
 341
 342   RequestParams params;
 343
 344   if (aKeyOnly) {
 345     params = IndexGetKeyParams(objectStoreId, indexId, serializedKeyRange);
 346   } else {
 347     params = IndexGetParams(objectStoreId, indexId, serializedKeyRange);
 348   }
 349
 350   auto request = GenerateRequest(aCx, this).unwrap();
 351
 352   if (aKeyOnly) {
 353     IDB_LOG_MARK_CHILD_TRANSACTION_REQUEST(
 354         "database(%s).transaction(%s).objectStore(%s).index(%s)."
 355         "getKey(%s)",
 356         "IDBIndex.getKey(%.0s%.0s%.0s%.0s%.0s)",
 357         transaction.LoggingSerialNumber(), request->LoggingSerialNumber(),
 358         IDB_LOG_STRINGIFY(transaction.Database()),
 359         IDB_LOG_STRINGIFY(transaction), IDB_LOG_STRINGIFY(mObjectStore),
 360         IDB_LOG_STRINGIFY(this), IDB_LOG_STRINGIFY(keyRange));
 361   } else {
 362     IDB_LOG_MARK_CHILD_TRANSACTION_REQUEST(
 363         "database(%s).transaction(%s).objectStore(%s).index(%s)."
 364         "get(%s)",
 365         "IDBIndex.get(%.0s%.0s%.0s%.0s%.0s)", transaction.LoggingSerialNumber(),
 366         request->LoggingSerialNumber(),
 367         IDB_LOG_STRINGIFY(transaction.Database()),
 368         IDB_LOG_STRINGIFY(transaction), IDB_LOG_STRINGIFY(mObjectStore),
 369         IDB_LOG_STRINGIFY(this), IDB_LOG_STRINGIFY(keyRange));
 370   }
 371
 372   auto& mutableTransaction = mObjectStore->MutableTransactionRef();
 373
 374   // TODO: This is necessary to preserve request ordering only. Proper
 375   // sequencing of requests should be done in a more sophisticated manner that
 376   // doesn't require invalidating cursor caches (Bug 1580499).
 377   mutableTransaction.InvalidateCursorCaches();
 378
 379   mutableTransaction.StartRequest(request, params);
 380
 381   return request;
 382 }
 383
 384 RefPtr<IDBRequest> IDBIndex::GetAllInternal(bool aKeysOnly, JSContext* aCx,
 385                                             JS::Handle<JS::Value> aKey,
 386                                             const Optional<uint32_t>& aLimit,
 387                                             ErrorResult& aRv) {
 388   AssertIsOnOwningThread();
 389
 390   if (mDeletedMetadata) {
 391     aRv.Throw(NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR);
 392     return nullptr;
 393   }
 394
 395   const auto& transaction = mObjectStore->TransactionRef();
 396   if (!transaction.IsActive()) {
 397     aRv.Throw(NS_ERROR_DOM_INDEXEDDB_TRANSACTION_INACTIVE_ERR);
 398     return nullptr;
 399   }
 400
 401   RefPtr<IDBKeyRange> keyRange;
 402   IDBKeyRange::FromJSVal(aCx, aKey, &keyRange, aRv);
 403   if (NS_WARN_IF(aRv.Failed())) {
 404     return nullptr;
 405   }
 406
 407   const int64_t objectStoreId = mObjectStore->Id();
 408   const int64_t indexId = Id();
 409
 410   Maybe<SerializedKeyRange> optionalKeyRange;
 411   if (keyRange) {
 412     SerializedKeyRange serializedKeyRange;
 413     keyRange->ToSerialized(serializedKeyRange);
 414     optionalKeyRange.emplace(serializedKeyRange);
 415   }
 416
 417   const uint32_t limit = aLimit.WasPassed() ? aLimit.Value() : 0;
 418
 419   const auto& params =
 420       aKeysOnly ? RequestParams{IndexGetAllKeysParams(objectStoreId, indexId,
 421                                                       optionalKeyRange, limit)}
 422                 : RequestParams{IndexGetAllParams(objectStoreId, indexId,
 423                                                   optionalKeyRange, limit)};
 424
 425   auto request = GenerateRequest(aCx, this).unwrap();
 426
 427   if (aKeysOnly) {
 428     IDB_LOG_MARK_CHILD_TRANSACTION_REQUEST(
 429         "database(%s).transaction(%s).objectStore(%s).index(%s)."
 430         "getAllKeys(%s, %s)",
 431         "IDBIndex.getAllKeys(%.0s%.0s%.0s%.0s%.0s%.0s)",
 432         transaction.LoggingSerialNumber(), request->LoggingSerialNumber(),
 433         IDB_LOG_STRINGIFY(transaction.Database()),
 434         IDB_LOG_STRINGIFY(transaction), IDB_LOG_STRINGIFY(mObjectStore),
 435         IDB_LOG_STRINGIFY(this), IDB_LOG_STRINGIFY(keyRange),
 436         IDB_LOG_STRINGIFY(aLimit));
 437   } else {
 438     IDB_LOG_MARK_CHILD_TRANSACTION_REQUEST(
 439         "database(%s).transaction(%s).objectStore(%s).index(%s)."
 440         "getAll(%s, %s)",
 441         "IDBIndex.getAll(%.0s%.0s%.0s%.0s%.0s%.0s)",
 442         transaction.LoggingSerialNumber(), request->LoggingSerialNumber(),
 443         IDB_LOG_STRINGIFY(transaction.Database()),
 444         IDB_LOG_STRINGIFY(transaction), IDB_LOG_STRINGIFY(mObjectStore),
 445         IDB_LOG_STRINGIFY(this), IDB_LOG_STRINGIFY(keyRange),
 446         IDB_LOG_STRINGIFY(aLimit));
 447   }
 448
 449   auto& mutableTransaction = mObjectStore->MutableTransactionRef();
 450
 451   // TODO: This is necessary to preserve request ordering only. Proper
 452   // sequencing of requests should be done in a more sophisticated manner that
 453   // doesn't require invalidating cursor caches (Bug 1580499).
 454   mutableTransaction.InvalidateCursorCaches();
 455
 456   mutableTransaction.StartRequest(request, params);
 457
 458   return request;
 459 }
 460
 461 RefPtr<IDBRequest> IDBIndex::OpenCursorInternal(bool aKeysOnly, JSContext* aCx,
 462                                                 JS::Handle<JS::Value> aRange,
 463                                                 IDBCursorDirection aDirection,
 464                                                 ErrorResult& aRv) {
 465   AssertIsOnOwningThread();
 466
 467   if (mDeletedMetadata) {
 468     aRv.Throw(NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR);
 469     return nullptr;
 470   }
 471
 472   const auto& transaction = mObjectStore->TransactionRef();
 473   if (!transaction.IsActive()) {
 474     aRv.Throw(NS_ERROR_DOM_INDEXEDDB_TRANSACTION_INACTIVE_ERR);
 475     return nullptr;
 476   }
 477
 478   RefPtr<IDBKeyRange> keyRange;
 479   IDBKeyRange::FromJSVal(aCx, aRange, &keyRange, aRv);
 480   if (NS_WARN_IF(aRv.Failed())) {
 481     return nullptr;
 482   }
 483
 484   const int64_t objectStoreId = mObjectStore->Id();
 485   const int64_t indexId = Id();
 486
 487   Maybe<SerializedKeyRange> optionalKeyRange;
 488
 489   if (keyRange) {
 490     SerializedKeyRange serializedKeyRange;
 491     keyRange->ToSerialized(serializedKeyRange);
 492
 493     optionalKeyRange.emplace(std::move(serializedKeyRange));
 494   }
 495
 496   const CommonIndexOpenCursorParams commonIndexParams = {
 497       {objectStoreId, std::move(optionalKeyRange), aDirection}, indexId};
 498
 499   const auto params =
 500       aKeysOnly ? OpenCursorParams{IndexOpenKeyCursorParams{commonIndexParams}}
 501                 : OpenCursorParams{IndexOpenCursorParams{commonIndexParams}};
 502
 503   auto request = GenerateRequest(aCx, this).unwrap();
 504
 505   if (aKeysOnly) {
 506     IDB_LOG_MARK_CHILD_TRANSACTION_REQUEST(
 507         "database(%s).transaction(%s).objectStore(%s).index(%s)."
 508         "openKeyCursor(%s, %s)",
 509         "IDBIndex.openKeyCursor(%.0s%.0s%.0s%.0s%.0s%.0s)",
 510         transaction.LoggingSerialNumber(), request->LoggingSerialNumber(),
 511         IDB_LOG_STRINGIFY(transaction.Database()),
 512         IDB_LOG_STRINGIFY(transaction), IDB_LOG_STRINGIFY(mObjectStore),
 513         IDB_LOG_STRINGIFY(this), IDB_LOG_STRINGIFY(keyRange),
 514         IDB_LOG_STRINGIFY(aDirection));
 515   } else {
 516     IDB_LOG_MARK_CHILD_TRANSACTION_REQUEST(
 517         "database(%s).transaction(%s).objectStore(%s).index(%s)."
 518         "openCursor(%s, %s)",
 519         "IDBIndex.openCursor(%.0s%.0s%.0s%.0s%.0s%.0s)",
 520         transaction.LoggingSerialNumber(), request->LoggingSerialNumber(),
 521         IDB_LOG_STRINGIFY(transaction.Database()),
 522         IDB_LOG_STRINGIFY(transaction), IDB_LOG_STRINGIFY(mObjectStore),
 523         IDB_LOG_STRINGIFY(this), IDB_LOG_STRINGIFY(keyRange),
 524         IDB_LOG_STRINGIFY(aDirection));
 525   }
 526
 527   const auto actor =
 528       aKeysOnly
 529           ? static_cast<SafeRefPtr<BackgroundCursorChildBase>>(
 530                 MakeSafeRefPtr<BackgroundCursorChild<IDBCursorType::IndexKey>>(
 531                     request, this, aDirection))
 532           : MakeSafeRefPtr<BackgroundCursorChild<IDBCursorType::Index>>(
 533                 request, this, aDirection);
 534
 535   auto& mutableTransaction = mObjectStore->MutableTransactionRef();
 536
 537   // TODO: This is necessary to preserve request ordering only. Proper
 538   // sequencing of requests should be done in a more sophisticated manner that
 539   // doesn't require invalidating cursor caches (Bug 1580499).
 540   mutableTransaction.InvalidateCursorCaches();
 541
 542   mutableTransaction.OpenCursor(*actor, params);
 543
 544   return request;
 545 }
 546
 547 RefPtr<IDBRequest> IDBIndex::Count(JSContext* aCx, JS::Handle<JS::Value> aKey,
 548                                    ErrorResult& aRv) {
 549   AssertIsOnOwningThread();
 550
 551   if (mDeletedMetadata) {
 552     aRv.Throw(NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR);
 553     return nullptr;
 554   }
 555
 556   const auto& transaction = mObjectStore->TransactionRef();
 557   if (!transaction.IsActive()) {
 558     aRv.Throw(NS_ERROR_DOM_INDEXEDDB_TRANSACTION_INACTIVE_ERR);
 559     return nullptr;
 560   }
 561
 562   RefPtr<IDBKeyRange> keyRange;
 563   IDBKeyRange::FromJSVal(aCx, aKey, &keyRange, aRv);
 564   if (aRv.Failed()) {
 565     return nullptr;
 566   }
 567
 568   IndexCountParams params;
 569   params.objectStoreId() = mObjectStore->Id();
 570   params.indexId() = Id();
 571
 572   if (keyRange) {
 573     SerializedKeyRange serializedKeyRange;
 574     keyRange->ToSerialized(serializedKeyRange);
 575     params.optionalKeyRange().emplace(serializedKeyRange);
 576   }
 577
 578   auto request = GenerateRequest(aCx, this).unwrap();
 579
 580   IDB_LOG_MARK_CHILD_TRANSACTION_REQUEST(
 581       "database(%s).transaction(%s).objectStore(%s).index(%s)."
 582       "count(%s)",
 583       "IDBIndex.count(%.0s%.0s%.0s%.0s%.0s)", transaction.LoggingSerialNumber(),
 584       request->LoggingSerialNumber(), IDB_LOG_STRINGIFY(transaction.Database()),
 585       IDB_LOG_STRINGIFY(transaction), IDB_LOG_STRINGIFY(mObjectStore),
 586       IDB_LOG_STRINGIFY(this), IDB_LOG_STRINGIFY(keyRange));
 587
 588   auto& mutableTransaction = mObjectStore->MutableTransactionRef();
 589
 590   // TODO: This is necessary to preserve request ordering only. Proper
 591   // sequencing of requests should be done in a more sophisticated manner that
 592   // doesn't require invalidating cursor caches (Bug 1580499).
 593   mutableTransaction.InvalidateCursorCaches();
 594
 595   mutableTransaction.StartRequest(request, params);
 596
 597   return request;
 598 }
 599
 600 NS_IMPL_CYCLE_COLLECTING_ADDREF(IDBIndex)
 601 NS_IMPL_CYCLE_COLLECTING_RELEASE(IDBIndex)
 602
 603 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(IDBIndex)
 604   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
 605   NS_INTERFACE_MAP_ENTRY(nsISupports)
 606 NS_INTERFACE_MAP_END
 607
 608 NS_IMPL_CYCLE_COLLECTION_CLASS(IDBIndex)
 609
 610 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(IDBIndex)
 611   NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
 612   NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mCachedKeyPath)
 613 NS_IMPL_CYCLE_COLLECTION_TRACE_END
 614
 615 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(IDBIndex)
 616   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mObjectStore)
 617 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 618
 619 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(IDBIndex)
 620   NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
 621
 622   // Don't unlink mObjectStore!
 623
 624   tmp->mCachedKeyPath.setUndefined();
 625
 626   if (tmp->mRooted) {
 627     mozilla::DropJSObjects(tmp);
 628     tmp->mRooted = false;
 629   }
 630 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 631
 632 JSObject* IDBIndex::WrapObject(JSContext* aCx,
 633                                JS::Handle<JSObject*> aGivenProto) {
 634   return IDBIndex_Binding::Wrap(aCx, this, aGivenProto);
 635 }
 636
 637 }  // namespace mozilla::dom