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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "modules/webdatabase/SQLTransactionBackendSync.h"
#include "bindings/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "core/dom/ExecutionContext.h"
#include "modules/webdatabase/sqlite/SQLValue.h"
#include "modules/webdatabase/sqlite/SQLiteTransaction.h"
#include "modules/webdatabase/DatabaseAuthorizer.h"
#include "modules/webdatabase/DatabaseContext.h"
#include "modules/webdatabase/DatabaseSync.h"
#include "modules/webdatabase/SQLError.h"
#include "modules/webdatabase/SQLResultSet.h"
#include "modules/webdatabase/SQLStatementSync.h"
#include "modules/webdatabase/SQLTransactionClient.h"
#include "modules/webdatabase/SQLTransactionSync.h"
#include "modules/webdatabase/SQLTransactionSyncCallback.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
namespace WebCore {
SQLTransactionBackendSync::SQLTransactionBackendSync(DatabaseSync* db, PassOwnPtr<SQLTransactionSyncCallback> callback, bool readOnly)
: m_database(db)
, m_callback(callback)
, m_readOnly(readOnly)
, m_hasVersionMismatch(false)
, m_modifiedDatabase(false)
, m_transactionClient(adoptPtr(new SQLTransactionClient()))
{
ASSERT(m_database->executionContext()->isContextThread());
}
SQLTransactionBackendSync::~SQLTransactionBackendSync()
{
ASSERT(m_database->executionContext()->isContextThread());
if (m_sqliteTransaction && m_sqliteTransaction->inProgress())
rollback();
}
PassRefPtr<SQLResultSet> SQLTransactionBackendSync::executeSQL(const String& sqlStatement, const Vector<SQLValue>& arguments, ExceptionState& exceptionState)
{
ASSERT(m_database->executionContext()->isContextThread());
m_database->setLastErrorMessage("");
if (!m_database->opened()) {
m_database->setLastErrorMessage("cannot executeSQL because the database is not open");
exceptionState.throwDOMException(UnknownError, SQLError::unknownErrorMessage);
return 0;
}
if (m_hasVersionMismatch) {
m_database->setLastErrorMessage("cannot executeSQL because there is a version mismatch");
exceptionState.throwDOMException(VersionError, SQLError::versionErrorMessage);
return 0;
}
if (sqlStatement.isEmpty())
return 0;
int permissions = DatabaseAuthorizer::ReadWriteMask;
if (!m_database->databaseContext()->allowDatabaseAccess())
permissions |= DatabaseAuthorizer::NoAccessMask;
else if (m_readOnly)
permissions |= DatabaseAuthorizer::ReadOnlyMask;
SQLStatementSync statement(sqlStatement, arguments, permissions);
m_database->resetAuthorizer();
bool retryStatement = true;
RefPtr<SQLResultSet> resultSet;
while (retryStatement) {
retryStatement = false;
resultSet = statement.execute(m_database.get(), exceptionState);
if (!resultSet) {
if (m_sqliteTransaction->wasRolledBackBySqlite())
return 0;
if (exceptionState.code() == QuotaExceededError) {
if (m_transactionClient->didExceedQuota(database())) {
exceptionState.clearException();
retryStatement = true;
} else {
m_database->setLastErrorMessage("there was not enough remaining storage space");
return 0;
}
}
}
}
if (m_database->lastActionChangedDatabase())
m_modifiedDatabase = true;
return resultSet.release();
}
void SQLTransactionBackendSync::begin(ExceptionState& exceptionState)
{
ASSERT(m_database->executionContext()->isContextThread());
if (!m_database->opened()) {
m_database->reportStartTransactionResult(1, SQLError::UNKNOWN_ERR, 0);
m_database->setLastErrorMessage("cannot begin transaction because the database is not open");
exceptionState.throwDOMException(UnknownError, SQLError::unknownErrorMessage);
return;
}
ASSERT(!m_database->sqliteDatabase().transactionInProgress());
// Set the maximum usage for this transaction if this transactions is not read-only.
if (!m_readOnly)
m_database->sqliteDatabase().setMaximumSize(m_database->maximumSize());
ASSERT(!m_sqliteTransaction);
m_sqliteTransaction = adoptPtr(new SQLiteTransaction(m_database->sqliteDatabase(), m_readOnly));
m_database->resetDeletes();
m_database->disableAuthorizer();
m_sqliteTransaction->begin();
m_database->enableAuthorizer();
// Check if begin() succeeded.
if (!m_sqliteTransaction->inProgress()) {
ASSERT(!m_database->sqliteDatabase().transactionInProgress());
m_database->reportStartTransactionResult(2, SQLError::DATABASE_ERR, m_database->sqliteDatabase().lastError());
m_database->setLastErrorMessage("unable to begin transaction",
m_database->sqliteDatabase().lastError(), m_database->sqliteDatabase().lastErrorMsg());
m_sqliteTransaction.clear();
exceptionState.throwUninformativeAndGenericDOMException(SQLDatabaseError);
return;
}
// Note: We intentionally retrieve the actual version even with an empty expected version.
// In multi-process browsers, we take this opportinutiy to update the cached value for
// the actual version. In single-process browsers, this is just a map lookup.
String actualVersion;
if (!m_database->getActualVersionForTransaction(actualVersion)) {
m_database->reportStartTransactionResult(3, SQLError::DATABASE_ERR, m_database->sqliteDatabase().lastError());
m_database->setLastErrorMessage("unable to read version",
m_database->sqliteDatabase().lastError(), m_database->sqliteDatabase().lastErrorMsg());
rollback();
exceptionState.throwUninformativeAndGenericDOMException(SQLDatabaseError);
return;
}
m_hasVersionMismatch = !m_database->expectedVersion().isEmpty() && (m_database->expectedVersion() != actualVersion);
m_database->reportStartTransactionResult(0, -1, 0); // OK
}
void SQLTransactionBackendSync::execute(ExceptionState& exceptionState)
{
ASSERT(m_database->executionContext()->isContextThread());
if (!m_database->opened() || (m_callback && !m_callback->handleEvent(SQLTransactionSync::from(this)))) {
if (m_database->lastErrorMessage().isEmpty())
m_database->setLastErrorMessage("failed to execute transaction callback");
m_callback.clear();
exceptionState.throwDOMException(UnknownError, SQLError::unknownErrorMessage);
return;
}
m_callback.clear();
}
void SQLTransactionBackendSync::commit(ExceptionState& exceptionState)
{
ASSERT(m_database->executionContext()->isContextThread());
if (!m_database->opened()) {
m_database->reportCommitTransactionResult(1, SQLError::UNKNOWN_ERR, 0);
m_database->setLastErrorMessage("unable to commit transaction because the database is not open.");
exceptionState.throwDOMException(UnknownError, SQLError::unknownErrorMessage);
return;
}
ASSERT(m_sqliteTransaction);
m_database->disableAuthorizer();
m_sqliteTransaction->commit();
m_database->enableAuthorizer();
// If the commit failed, the transaction will still be marked as "in progress"
if (m_sqliteTransaction->inProgress()) {
m_database->reportCommitTransactionResult(2, SQLError::DATABASE_ERR, m_database->sqliteDatabase().lastError());
m_database->setLastErrorMessage("unable to commit transaction",
m_database->sqliteDatabase().lastError(), m_database->sqliteDatabase().lastErrorMsg());
exceptionState.throwUninformativeAndGenericDOMException(SQLDatabaseError);
return;
}
m_sqliteTransaction.clear();
// Vacuum the database if anything was deleted.
if (m_database->hadDeletes())
m_database->incrementalVacuumIfNeeded();
// The commit was successful. If the transaction modified this database, notify the delegates.
if (m_modifiedDatabase)
m_transactionClient->didCommitWriteTransaction(database());
m_database->reportCommitTransactionResult(0, -1, 0); // OK
}
void SQLTransactionBackendSync::rollback()
{
ASSERT(m_database->executionContext()->isContextThread());
m_database->disableAuthorizer();
if (m_sqliteTransaction) {
m_sqliteTransaction->rollback();
m_sqliteTransaction.clear();
}
m_database->enableAuthorizer();
ASSERT(!m_database->sqliteDatabase().transactionInProgress());
}
} // namespace WebCore
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