зеркало из https://github.com/mozilla/gecko-dev.git
346 строки
11 KiB
C++
346 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <limits.h>
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#include <stdio.h>
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#include "nsError.h"
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#include "nsMemory.h"
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#include "nsProxyRelease.h"
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#include "nsThreadUtils.h"
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#include "nsIClassInfoImpl.h"
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#include "Variant.h"
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#include "mozIStorageError.h"
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#include "mozStorageBindingParams.h"
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#include "mozStorageConnection.h"
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#include "mozStorageAsyncStatementJSHelper.h"
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#include "mozStorageAsyncStatementParams.h"
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#include "mozStoragePrivateHelpers.h"
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#include "mozStorageStatementRow.h"
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#include "mozStorageStatement.h"
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#include "mozilla/Logging.h"
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extern mozilla::LazyLogModule gStorageLog;
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namespace mozilla {
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namespace storage {
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////////////////////////////////////////////////////////////////////////////////
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//// nsIClassInfo
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NS_IMPL_CI_INTERFACE_GETTER(AsyncStatement, mozIStorageAsyncStatement,
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mozIStorageBaseStatement, mozIStorageBindingParams,
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mozilla::storage::StorageBaseStatementInternal)
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class AsyncStatementClassInfo : public nsIClassInfo {
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public:
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constexpr AsyncStatementClassInfo() {}
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NS_DECL_ISUPPORTS_INHERITED
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NS_IMETHOD
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GetInterfaces(nsTArray<nsIID> &_array) override {
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return NS_CI_INTERFACE_GETTER_NAME(AsyncStatement)(_array);
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}
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NS_IMETHOD
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GetScriptableHelper(nsIXPCScriptable **_helper) override {
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static AsyncStatementJSHelper sJSHelper;
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*_helper = &sJSHelper;
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return NS_OK;
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}
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NS_IMETHOD
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GetContractID(nsACString &aContractID) override {
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aContractID.SetIsVoid(true);
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return NS_OK;
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}
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NS_IMETHOD
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GetClassDescription(nsACString &aDesc) override {
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aDesc.SetIsVoid(true);
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return NS_OK;
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}
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NS_IMETHOD
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GetClassID(nsCID **_id) override {
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*_id = nullptr;
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return NS_OK;
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}
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NS_IMETHOD
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GetFlags(uint32_t *_flags) override {
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*_flags = 0;
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return NS_OK;
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}
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NS_IMETHOD
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GetClassIDNoAlloc(nsCID *_cid) override { return NS_ERROR_NOT_AVAILABLE; }
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};
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NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementClassInfo::AddRef() {
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return 2;
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}
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NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementClassInfo::Release() {
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return 1;
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}
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NS_IMPL_QUERY_INTERFACE(AsyncStatementClassInfo, nsIClassInfo)
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static AsyncStatementClassInfo sAsyncStatementClassInfo;
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////////////////////////////////////////////////////////////////////////////////
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//// AsyncStatement
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AsyncStatement::AsyncStatement()
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: StorageBaseStatementInternal(), mFinalized(false) {}
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nsresult AsyncStatement::initialize(Connection *aDBConnection,
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sqlite3 *aNativeConnection,
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const nsACString &aSQLStatement) {
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MOZ_ASSERT(aDBConnection, "No database connection given!");
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MOZ_ASSERT(aDBConnection->isConnectionReadyOnThisThread(),
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"Database connection should be valid");
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MOZ_ASSERT(aNativeConnection, "No native connection given!");
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mDBConnection = aDBConnection;
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mNativeConnection = aNativeConnection;
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mSQLString = aSQLStatement;
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MOZ_LOG(gStorageLog, LogLevel::Debug,
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("Inited async statement '%s' (0x%p)", mSQLString.get(), this));
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#ifdef DEBUG
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// We want to try and test for LIKE and that consumers are using
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// escapeStringForLIKE instead of just trusting user input. The idea to
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// check to see if they are binding a parameter after like instead of just
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// using a string. We only do this in debug builds because it's expensive!
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const nsCaseInsensitiveCStringComparator c;
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nsACString::const_iterator start, end, e;
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aSQLStatement.BeginReading(start);
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aSQLStatement.EndReading(end);
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e = end;
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while (::FindInReadable(NS_LITERAL_CSTRING(" LIKE"), start, e, c)) {
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// We have a LIKE in here, so we perform our tests
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// FindInReadable moves the iterator, so we have to get a new one for
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// each test we perform.
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nsACString::const_iterator s1, s2, s3;
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s1 = s2 = s3 = start;
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if (!(::FindInReadable(NS_LITERAL_CSTRING(" LIKE ?"), s1, end, c) ||
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::FindInReadable(NS_LITERAL_CSTRING(" LIKE :"), s2, end, c) ||
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::FindInReadable(NS_LITERAL_CSTRING(" LIKE @"), s3, end, c))) {
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// At this point, we didn't find a LIKE statement followed by ?, :,
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// or @, all of which are valid characters for binding a parameter.
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// We will warn the consumer that they may not be safely using LIKE.
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NS_WARNING(
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"Unsafe use of LIKE detected! Please ensure that you "
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"are using mozIStorageAsyncStatement::escapeStringForLIKE "
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"and that you are binding that result to the statement "
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"to prevent SQL injection attacks.");
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}
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// resetting start and e
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start = e;
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e = end;
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}
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#endif
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return NS_OK;
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}
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mozIStorageBindingParams *AsyncStatement::getParams() {
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nsresult rv;
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// If we do not have an array object yet, make it.
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if (!mParamsArray) {
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nsCOMPtr<mozIStorageBindingParamsArray> array;
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rv = NewBindingParamsArray(getter_AddRefs(array));
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NS_ENSURE_SUCCESS(rv, nullptr);
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mParamsArray = static_cast<BindingParamsArray *>(array.get());
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}
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// If there isn't already any rows added, we'll have to add one to use.
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if (mParamsArray->length() == 0) {
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RefPtr<AsyncBindingParams> params(new AsyncBindingParams(mParamsArray));
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NS_ENSURE_TRUE(params, nullptr);
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rv = mParamsArray->AddParams(params);
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NS_ENSURE_SUCCESS(rv, nullptr);
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// We have to unlock our params because AddParams locks them. This is safe
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// because no reference to the params object was, or ever will be given out.
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params->unlock(nullptr);
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// We also want to lock our array at this point - we don't want anything to
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// be added to it.
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mParamsArray->lock();
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}
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return *mParamsArray->begin();
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}
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/**
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* If we are here then we know there are no pending async executions relying on
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* us (StatementData holds a reference to us; this also goes for our own
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* AsyncStatementFinalizer which proxies its release to the calling thread) and
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* so it is always safe to destroy our sqlite3_stmt if one exists. We can be
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* destroyed on the caller thread by garbage-collection/reference counting or on
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* the async thread by the last execution of a statement that already lost its
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* main-thread refs.
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*/
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AsyncStatement::~AsyncStatement() {
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destructorAsyncFinalize();
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// If we are getting destroyed on the wrong thread, proxy the connection
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// release to the right thread. I'm not sure why we do this.
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bool onCallingThread = false;
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(void)mDBConnection->threadOpenedOn->IsOnCurrentThread(&onCallingThread);
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if (!onCallingThread) {
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// NS_ProxyRelase only magic forgets for us if mDBConnection is an
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// nsCOMPtr. Which it is not; it's an nsRefPtr.
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nsCOMPtr<nsIThread> targetThread(mDBConnection->threadOpenedOn);
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NS_ProxyRelease("AsyncStatement::mDBConnection", targetThread,
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mDBConnection.forget());
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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//// nsISupports
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NS_IMPL_ADDREF(AsyncStatement)
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NS_IMPL_RELEASE(AsyncStatement)
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NS_INTERFACE_MAP_BEGIN(AsyncStatement)
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NS_INTERFACE_MAP_ENTRY(mozIStorageAsyncStatement)
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NS_INTERFACE_MAP_ENTRY(mozIStorageBaseStatement)
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NS_INTERFACE_MAP_ENTRY(mozIStorageBindingParams)
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NS_INTERFACE_MAP_ENTRY(mozilla::storage::StorageBaseStatementInternal)
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if (aIID.Equals(NS_GET_IID(nsIClassInfo))) {
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foundInterface = static_cast<nsIClassInfo *>(&sAsyncStatementClassInfo);
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} else
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NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, mozIStorageAsyncStatement)
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NS_INTERFACE_MAP_END
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////////////////////////////////////////////////////////////////////////////////
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//// StorageBaseStatementInternal
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Connection *AsyncStatement::getOwner() { return mDBConnection; }
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int AsyncStatement::getAsyncStatement(sqlite3_stmt **_stmt) {
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#ifdef DEBUG
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// Make sure we are never called on the connection's owning thread.
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bool onOpenedThread = false;
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(void)mDBConnection->threadOpenedOn->IsOnCurrentThread(&onOpenedThread);
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NS_ASSERTION(!onOpenedThread,
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"We should only be called on the async thread!");
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#endif
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if (!mAsyncStatement) {
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int rc = mDBConnection->prepareStatement(mNativeConnection, mSQLString,
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&mAsyncStatement);
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if (rc != SQLITE_OK) {
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MOZ_LOG(gStorageLog, LogLevel::Error,
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("Sqlite statement prepare error: %d '%s'", rc,
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::sqlite3_errmsg(mNativeConnection)));
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MOZ_LOG(gStorageLog, LogLevel::Error,
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("Statement was: '%s'", mSQLString.get()));
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*_stmt = nullptr;
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return rc;
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}
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MOZ_LOG(gStorageLog, LogLevel::Debug,
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("Initialized statement '%s' (0x%p)", mSQLString.get(),
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mAsyncStatement));
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}
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*_stmt = mAsyncStatement;
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return SQLITE_OK;
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}
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nsresult AsyncStatement::getAsynchronousStatementData(StatementData &_data) {
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if (mFinalized) return NS_ERROR_UNEXPECTED;
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// Pass null for the sqlite3_stmt; it will be requested on demand from the
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// async thread.
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_data = StatementData(nullptr, bindingParamsArray(), this);
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return NS_OK;
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}
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already_AddRefed<mozIStorageBindingParams> AsyncStatement::newBindingParams(
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mozIStorageBindingParamsArray *aOwner) {
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if (mFinalized) return nullptr;
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nsCOMPtr<mozIStorageBindingParams> params(new AsyncBindingParams(aOwner));
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return params.forget();
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}
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////////////////////////////////////////////////////////////////////////////////
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//// mozIStorageAsyncStatement
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// (nothing is specific to mozIStorageAsyncStatement)
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////////////////////////////////////////////////////////////////////////////////
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//// StorageBaseStatementInternal
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// proxy to StorageBaseStatementInternal using its define helper.
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MIXIN_IMPL_STORAGEBASESTATEMENTINTERNAL(
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AsyncStatement, if (mFinalized) return NS_ERROR_UNEXPECTED;)
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NS_IMETHODIMP
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AsyncStatement::Finalize() {
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if (mFinalized) return NS_OK;
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mFinalized = true;
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MOZ_LOG(gStorageLog, LogLevel::Debug,
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("Finalizing statement '%s'", mSQLString.get()));
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asyncFinalize();
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// Release the params holder, so it can release the reference to us.
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mStatementParamsHolder = nullptr;
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return NS_OK;
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}
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NS_IMETHODIMP
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AsyncStatement::BindParameters(mozIStorageBindingParamsArray *aParameters) {
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if (mFinalized) return NS_ERROR_UNEXPECTED;
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BindingParamsArray *array = static_cast<BindingParamsArray *>(aParameters);
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if (array->getOwner() != this) return NS_ERROR_UNEXPECTED;
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if (array->length() == 0) return NS_ERROR_UNEXPECTED;
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mParamsArray = array;
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mParamsArray->lock();
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return NS_OK;
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}
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NS_IMETHODIMP
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AsyncStatement::GetState(int32_t *_state) {
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if (mFinalized)
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*_state = MOZ_STORAGE_STATEMENT_INVALID;
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else
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*_state = MOZ_STORAGE_STATEMENT_READY;
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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//// mozIStorageBindingParams
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BOILERPLATE_BIND_PROXIES(AsyncStatement,
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if (mFinalized) return NS_ERROR_UNEXPECTED;)
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} // namespace storage
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} // namespace mozilla
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