void
IDBDatabase::AbortTransactions(bool aShouldWarn)
{
AssertIsOnOwningThread();
class MOZ_STACK_CLASS Helper final
{
typedef nsAutoTArray<RefPtr<IDBTransaction>, 20> StrongTransactionArray;
typedef nsAutoTArray<IDBTransaction*, 20> WeakTransactionArray;
public:
static void
AbortTransactions(IDBDatabase* aDatabase, const bool aShouldWarn)
{
MOZ_ASSERT(aDatabase);
aDatabase->AssertIsOnOwningThread();
nsTHashtable<nsPtrHashKey<IDBTransaction>>& transactionTable =
aDatabase->mTransactions;
if (!transactionTable.Count()) {
return;
}
StrongTransactionArray transactionsToAbort;
transactionsToAbort.SetCapacity(transactionTable.Count());
for (auto iter = transactionTable.Iter(); !iter.Done(); iter.Next()) {
IDBTransaction* transaction = iter.Get()->GetKey();
MOZ_ASSERT(transaction);
transaction->AssertIsOnOwningThread();
// Transactions that are already done can simply be ignored. Otherwise
// there is a race here and it's possible that the transaction has not
// been successfully committed yet so we will warn the user.
if (!transaction->IsDone()) {
transactionsToAbort.AppendElement(transaction);
}
}
MOZ_ASSERT(transactionsToAbort.Length() <= transactionTable.Count());
if (transactionsToAbort.IsEmpty()) {
return;
}
// We want to abort transactions as soon as possible so we iterate the
// transactions once and abort them all first, collecting the transactions
// that need to have a warning issued along the way. Those that need a
// warning will be a subset of those that are aborted, so we don't need
// additional strong references here.
WeakTransactionArray transactionsThatNeedWarning;
for (RefPtr<IDBTransaction>& transaction : transactionsToAbort) {
MOZ_ASSERT(transaction);
MOZ_ASSERT(!transaction->IsDone());
if (aShouldWarn) {
switch (transaction->GetMode()) {
// We ignore transactions that could not have written any data.
case IDBTransaction::READ_ONLY:
break;
// We warn for any transactions that could have written data.
case IDBTransaction::READ_WRITE:
case IDBTransaction::READ_WRITE_FLUSH:
case IDBTransaction::VERSION_CHANGE:
transactionsThatNeedWarning.AppendElement(transaction);
break;
default:
MOZ_CRASH("Unknown mode!");
}
}
transaction->Abort(NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
}
static const char kWarningMessage[] =
"IndexedDBTransactionAbortNavigation";
for (IDBTransaction* transaction : transactionsThatNeedWarning) {
MOZ_ASSERT(transaction);
nsString filename;
uint32_t lineNo, column;
transaction->GetCallerLocation(filename, &lineNo, &column);
aDatabase->LogWarning(kWarningMessage, filename, lineNo, column);
}
}
