зеркало из https://github.com/mozilla/pjs.git
551 строка
15 KiB
C++
551 строка
15 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Indexed Database.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Ben Turner <bent.mozilla@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "AsyncConnectionHelper.h"
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#include "mozilla/storage.h"
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#include "nsComponentManagerUtils.h"
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#include "nsContentUtils.h"
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#include "nsProxyRelease.h"
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#include "nsThreadUtils.h"
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#include "IDBEvents.h"
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#include "IDBFactory.h"
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#include "IDBTransaction.h"
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#include "TransactionThreadPool.h"
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using mozilla::TimeStamp;
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using mozilla::TimeDuration;
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USING_INDEXEDDB_NAMESPACE
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namespace {
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IDBTransaction* gCurrentTransaction = nsnull;
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const PRUint32 kProgressHandlerGranularity = 1000;
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const PRUint32 kDefaultTimeoutMS = 30000;
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NS_STACK_CLASS
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class TransactionPoolEventTarget : public nsIEventTarget
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIEVENTTARGET
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TransactionPoolEventTarget(IDBTransaction* aTransaction)
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: mTransaction(aTransaction)
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{ }
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private:
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IDBTransaction* mTransaction;
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};
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// This inline is just so that we always clear aBuffers appropriately even if
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// something fails.
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inline
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nsresult
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ConvertCloneBuffersToArrayInternal(
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JSContext* aCx,
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nsTArray<JSAutoStructuredCloneBuffer>& aBuffers,
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jsval* aResult)
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{
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JSObject* array = JS_NewArrayObject(aCx, 0, nsnull);
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if (!array) {
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NS_WARNING("Failed to make array!");
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return NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
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}
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if (!aBuffers.IsEmpty()) {
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if (!JS_SetArrayLength(aCx, array, jsuint(aBuffers.Length()))) {
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NS_WARNING("Failed to set array length!");
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return NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
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}
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jsint count = jsint(aBuffers.Length());
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for (jsint index = 0; index < count; index++) {
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JSAutoStructuredCloneBuffer& buffer = aBuffers[index];
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jsval val;
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if (!IDBObjectStore::DeserializeValue(aCx, buffer, &val)) {
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NS_WARNING("Failed to decode!");
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return NS_ERROR_DOM_DATA_CLONE_ERR;
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}
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if (!JS_SetElement(aCx, array, index, &val)) {
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NS_WARNING("Failed to set array element!");
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return NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
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}
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}
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}
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*aResult = OBJECT_TO_JSVAL(array);
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return NS_OK;
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}
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} // anonymous namespace
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AsyncConnectionHelper::AsyncConnectionHelper(IDBDatabase* aDatabase,
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IDBRequest* aRequest)
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: mDatabase(aDatabase),
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mRequest(aRequest),
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mTimeoutDuration(TimeDuration::FromMilliseconds(kDefaultTimeoutMS)),
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mResultCode(NS_OK),
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mDispatched(PR_FALSE)
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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}
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AsyncConnectionHelper::AsyncConnectionHelper(IDBTransaction* aTransaction,
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IDBRequest* aRequest)
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: mDatabase(aTransaction->mDatabase),
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mTransaction(aTransaction),
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mRequest(aRequest),
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mTimeoutDuration(TimeDuration::FromMilliseconds(kDefaultTimeoutMS)),
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mResultCode(NS_OK),
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mDispatched(PR_FALSE)
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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}
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AsyncConnectionHelper::~AsyncConnectionHelper()
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{
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if (!NS_IsMainThread()) {
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IDBDatabase* database;
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mDatabase.forget(&database);
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IDBTransaction* transaction;
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mTransaction.forget(&transaction);
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IDBRequest* request;
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mRequest.forget(&request);
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nsCOMPtr<nsIThread> mainThread;
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NS_GetMainThread(getter_AddRefs(mainThread));
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NS_WARN_IF_FALSE(mainThread, "Couldn't get the main thread!");
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if (mainThread) {
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if (database) {
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NS_ProxyRelease(mainThread, static_cast<nsIIDBDatabase*>(database));
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}
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if (transaction) {
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NS_ProxyRelease(mainThread,
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static_cast<nsIIDBTransaction*>(transaction));
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}
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if (request) {
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NS_ProxyRelease(mainThread, static_cast<nsIDOMEventTarget*>(request));
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}
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}
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}
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NS_ASSERTION(!mOldProgressHandler, "Should not have anything here!");
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}
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NS_IMPL_THREADSAFE_ISUPPORTS2(AsyncConnectionHelper, nsIRunnable,
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mozIStorageProgressHandler)
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NS_IMETHODIMP
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AsyncConnectionHelper::Run()
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{
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if (NS_IsMainThread()) {
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if (mTransaction &&
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mTransaction->IsAborted() &&
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NS_SUCCEEDED(mResultCode)) {
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// Don't fire success events if the transaction has since been aborted.
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// Instead convert to an error event.
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mResultCode = NS_ERROR_DOM_INDEXEDDB_ABORT_ERR;
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}
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IDBTransaction* oldTransaction = gCurrentTransaction;
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gCurrentTransaction = mTransaction;
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if (mRequest) {
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nsresult rv = mRequest->SetDone(this);
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if (NS_SUCCEEDED(mResultCode) && NS_FAILED(rv)) {
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mResultCode = rv;
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}
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}
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// Call OnError if the database had an error or if the OnSuccess handler
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// has an error.
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if (NS_FAILED(mResultCode) ||
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NS_FAILED((mResultCode = OnSuccess()))) {
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OnError();
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}
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NS_ASSERTION(gCurrentTransaction == mTransaction, "Should be unchanged!");
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gCurrentTransaction = oldTransaction;
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if (mDispatched && mTransaction) {
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mTransaction->OnRequestFinished();
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}
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ReleaseMainThreadObjects();
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NS_ASSERTION(!(mDatabase || mTransaction || mRequest), "Subclass didn't "
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"call AsyncConnectionHelper::ReleaseMainThreadObjects!");
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return NS_OK;
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}
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nsresult rv = NS_OK;
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nsCOMPtr<mozIStorageConnection> connection;
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if (mTransaction) {
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rv = mTransaction->GetOrCreateConnection(getter_AddRefs(connection));
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if (NS_SUCCEEDED(rv)) {
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NS_ASSERTION(connection, "This should never be null!");
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}
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}
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if (connection) {
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rv = connection->SetProgressHandler(kProgressHandlerGranularity, this,
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getter_AddRefs(mOldProgressHandler));
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NS_WARN_IF_FALSE(NS_SUCCEEDED(rv), "SetProgressHandler failed!");
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if (NS_SUCCEEDED(rv)) {
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mStartTime = TimeStamp::Now();
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}
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}
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if (NS_SUCCEEDED(rv)) {
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bool hasSavepoint = false;
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if (mDatabase) {
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IDBFactory::SetCurrentDatabase(mDatabase);
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// Make the first savepoint.
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if (mTransaction) {
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if (!(hasSavepoint = mTransaction->StartSavepoint())) {
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NS_WARNING("Failed to make savepoint!");
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}
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}
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}
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mResultCode = DoDatabaseWork(connection);
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if (mDatabase) {
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IDBFactory::SetCurrentDatabase(nsnull);
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// Release or roll back the savepoint depending on the error code.
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if (hasSavepoint) {
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NS_ASSERTION(mTransaction, "Huh?!");
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if (NS_SUCCEEDED(mResultCode)) {
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mTransaction->ReleaseSavepoint();
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}
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else {
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mTransaction->RollbackSavepoint();
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}
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}
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}
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}
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else {
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// NS_ERROR_NOT_AVAILABLE is our special code for "database is invalidated"
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// and we should fail with RECOVERABLE_ERR.
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if (rv == NS_ERROR_NOT_AVAILABLE) {
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mResultCode = NS_ERROR_DOM_INDEXEDDB_RECOVERABLE_ERR;
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}
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else {
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mResultCode = NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
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}
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}
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if (!mStartTime.IsNull()) {
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nsCOMPtr<mozIStorageProgressHandler> handler;
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rv = connection->RemoveProgressHandler(getter_AddRefs(handler));
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NS_WARN_IF_FALSE(NS_SUCCEEDED(rv), "RemoveProgressHandler failed!");
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#ifdef DEBUG
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if (NS_SUCCEEDED(rv)) {
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nsCOMPtr<nsISupports> handlerSupports(do_QueryInterface(handler));
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nsCOMPtr<nsISupports> thisSupports =
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do_QueryInterface(static_cast<nsIRunnable*>(this));
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NS_ASSERTION(thisSupports == handlerSupports, "Mismatch!");
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}
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#endif
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mStartTime = TimeStamp();
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}
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return NS_DispatchToMainThread(this, NS_DISPATCH_NORMAL);
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}
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NS_IMETHODIMP
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AsyncConnectionHelper::OnProgress(mozIStorageConnection* aConnection,
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PRBool* _retval)
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{
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if (mDatabase && mDatabase->IsInvalidated()) {
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// Someone is trying to delete the database file. Exit lightningfast!
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*_retval = PR_TRUE;
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return NS_OK;
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}
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TimeDuration elapsed = TimeStamp::Now() - mStartTime;
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if (elapsed >= mTimeoutDuration) {
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*_retval = PR_TRUE;
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return NS_OK;
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}
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if (mOldProgressHandler) {
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return mOldProgressHandler->OnProgress(aConnection, _retval);
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}
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*_retval = PR_FALSE;
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return NS_OK;
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}
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nsresult
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AsyncConnectionHelper::Dispatch(nsIEventTarget* aDatabaseThread)
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{
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#ifdef DEBUG
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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{
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PRBool sameThread;
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nsresult rv = aDatabaseThread->IsOnCurrentThread(&sameThread);
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NS_ASSERTION(NS_SUCCEEDED(rv), "IsOnCurrentThread failed!");
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NS_ASSERTION(!sameThread, "Dispatching to main thread not supported!");
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}
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#endif
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nsresult rv = Init();
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if (NS_FAILED(rv)) {
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return rv;
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}
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rv = aDatabaseThread->Dispatch(this, NS_DISPATCH_NORMAL);
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NS_ENSURE_SUCCESS(rv, rv);
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if (mTransaction) {
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mTransaction->OnNewRequest();
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}
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mDispatched = PR_TRUE;
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return NS_OK;
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}
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nsresult
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AsyncConnectionHelper::DispatchToTransactionPool()
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{
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NS_ASSERTION(mTransaction, "Only ok to call this with a transaction!");
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TransactionPoolEventTarget target(mTransaction);
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return Dispatch(&target);
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}
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// static
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IDBTransaction*
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AsyncConnectionHelper::GetCurrentTransaction()
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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return gCurrentTransaction;
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}
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nsresult
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AsyncConnectionHelper::Init()
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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return NS_OK;
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}
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nsresult
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AsyncConnectionHelper::OnSuccess()
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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NS_ASSERTION(mRequest, "Null request!");
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nsRefPtr<nsDOMEvent> event =
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CreateGenericEvent(NS_LITERAL_STRING(SUCCESS_EVT_STR));
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if (!event) {
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NS_ERROR("Failed to create event!");
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return NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
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}
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PRBool dummy;
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nsresult rv = mRequest->DispatchEvent(event, &dummy);
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NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
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nsEvent* internalEvent = event->GetInternalNSEvent();
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NS_ASSERTION(internalEvent, "This should never be null!");
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NS_ASSERTION(!mTransaction ||
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mTransaction->IsOpen() ||
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mTransaction->IsAborted(),
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"How else can this be closed?!");
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if ((internalEvent->flags & NS_EVENT_FLAG_EXCEPTION_THROWN) &&
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mTransaction &&
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mTransaction->IsOpen()) {
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rv = mTransaction->Abort();
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NS_ENSURE_SUCCESS(rv, rv);
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}
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return NS_OK;
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}
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void
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AsyncConnectionHelper::OnError()
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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NS_ASSERTION(mRequest, "Null request!");
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// Make an error event and fire it at the target.
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nsRefPtr<nsDOMEvent> event =
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CreateGenericEvent(NS_LITERAL_STRING(ERROR_EVT_STR), PR_TRUE);
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if (!event) {
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NS_ERROR("Failed to create event!");
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return;
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}
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PRBool doDefault;
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nsresult rv = mRequest->DispatchEvent(event, &doDefault);
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if (NS_SUCCEEDED(rv)) {
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NS_ASSERTION(!mTransaction ||
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mTransaction->IsOpen() ||
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mTransaction->IsAborted(),
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"How else can this be closed?!");
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if (doDefault &&
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mTransaction &&
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mTransaction->IsOpen() &&
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NS_FAILED(mTransaction->Abort())) {
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NS_WARNING("Failed to abort transaction!");
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}
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}
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else {
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NS_WARNING("DispatchEvent failed!");
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}
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}
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nsresult
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AsyncConnectionHelper::GetSuccessResult(JSContext* aCx,
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jsval* aVal)
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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*aVal = JSVAL_VOID;
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return NS_OK;
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}
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void
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AsyncConnectionHelper::ReleaseMainThreadObjects()
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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mDatabase = nsnull;
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mTransaction = nsnull;
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mRequest = nsnull;
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}
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nsresult
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AsyncConnectionHelper::WrapNative(JSContext* aCx,
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nsISupports* aNative,
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jsval* aResult)
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{
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NS_ASSERTION(aCx, "Null context!");
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NS_ASSERTION(aNative, "Null pointer!");
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NS_ASSERTION(aResult, "Null pointer!");
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NS_ASSERTION(mRequest, "Null request!");
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JSObject* global =
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static_cast<JSObject*>(mRequest->ScriptContext()->GetNativeGlobal());
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NS_ENSURE_TRUE(global, NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
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nsresult rv =
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nsContentUtils::WrapNative(aCx, global, aNative, aResult);
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NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
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return NS_OK;
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}
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// static
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nsresult
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AsyncConnectionHelper::ConvertCloneBuffersToArray(
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JSContext* aCx,
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nsTArray<JSAutoStructuredCloneBuffer>& aBuffers,
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jsval* aResult)
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{
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NS_ASSERTION(aCx, "Null context!");
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NS_ASSERTION(aResult, "Null pointer!");
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JSAutoRequest ar(aCx);
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nsresult rv = ConvertCloneBuffersToArrayInternal(aCx, aBuffers, aResult);
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for (PRUint32 index = 0; index < aBuffers.Length(); index++) {
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aBuffers[index].clear(aCx);
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}
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aBuffers.Clear();
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return rv;
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}
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NS_IMETHODIMP_(nsrefcnt)
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TransactionPoolEventTarget::AddRef()
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{
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NS_NOTREACHED("Don't call me!");
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return 2;
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}
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NS_IMETHODIMP_(nsrefcnt)
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TransactionPoolEventTarget::Release()
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{
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NS_NOTREACHED("Don't call me!");
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return 1;
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}
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NS_IMPL_QUERY_INTERFACE1(TransactionPoolEventTarget, nsIEventTarget)
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NS_IMETHODIMP
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TransactionPoolEventTarget::Dispatch(nsIRunnable* aRunnable,
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PRUint32 aFlags)
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{
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NS_ASSERTION(aRunnable, "Null pointer!");
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NS_ASSERTION(aFlags == NS_DISPATCH_NORMAL, "Unsupported!");
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TransactionThreadPool* pool = TransactionThreadPool::GetOrCreate();
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NS_ENSURE_TRUE(pool, NS_ERROR_FAILURE);
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return pool->Dispatch(mTransaction, aRunnable, false, nsnull);
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}
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NS_IMETHODIMP
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TransactionPoolEventTarget::IsOnCurrentThread(PRBool* aResult)
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{
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*aResult = PR_FALSE;
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return NS_OK;
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}
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