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gecko-dev/dom/cache/Manager.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/cache/Manager.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/Mutex.h"
#include "mozilla/StaticMutex.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/cache/Context.h"
#include "mozilla/dom/cache/DBAction.h"
#include "mozilla/dom/cache/DBSchema.h"
#include "mozilla/dom/cache/FileUtils.h"
#include "mozilla/dom/cache/ManagerId.h"
#include "mozilla/dom/cache/CacheTypes.h"
#include "mozilla/dom/cache/SavedTypes.h"
#include "mozilla/dom/cache/StreamList.h"
#include "mozilla/dom/cache/Types.h"
#include "mozilla/ipc/BackgroundParent.h"
#include "mozStorageHelper.h"
#include "nsIInputStream.h"
#include "nsID.h"
#include "nsIFile.h"
#include "nsIThread.h"
#include "nsThreadUtils.h"
#include "nsTObserverArray.h"
#include "QuotaClientImpl.h"
namespace mozilla {
namespace dom {
namespace cache {
namespace {
/**
* Note: The aCommitHook argument will be invoked while a lock is held. Callers
* should be careful not to pass a hook that might lock on something else and
* trigger a deadlock.
*/
template <typename Callable>
nsresult MaybeUpdatePaddingFile(nsIFile* aBaseDir, mozIStorageConnection* aConn,
const int64_t aIncreaseSize,
const int64_t aDecreaseSize,
Callable aCommitHook) {
MOZ_ASSERT(!NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
MOZ_DIAGNOSTIC_ASSERT(aConn);
MOZ_DIAGNOSTIC_ASSERT(aIncreaseSize >= 0);
MOZ_DIAGNOSTIC_ASSERT(aDecreaseSize >= 0);
RefPtr<CacheQuotaClient> cacheQuotaClient = CacheQuotaClient::Get();
MOZ_DIAGNOSTIC_ASSERT(cacheQuotaClient);
nsresult rv = cacheQuotaClient->MaybeUpdatePaddingFileInternal(
aBaseDir, aConn, aIncreaseSize, aDecreaseSize, aCommitHook);
Unused << NS_WARN_IF(NS_FAILED(rv));
return rv;
}
// An Action that is executed when a Context is first created. It ensures that
// the directory and database are setup properly. This lets other actions
// not worry about these details.
class SetupAction final : public SyncDBAction {
public:
SetupAction() : SyncDBAction(DBAction::Create) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
MOZ_DIAGNOSTIC_ASSERT(aDBDir);
nsresult rv = BodyCreateDir(aDBDir);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// executes in its own transaction
rv = db::CreateOrMigrateSchema(aConn);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// If the Context marker file exists, then the last session was
// not cleanly shutdown. In these cases sqlite will ensure that
// the database is valid, but we might still orphan data. Both
// Cache objects and body files can be referenced by DOM objects
// after they are "removed" from their parent. So we need to
// look and see if any of these late access objects have been
// orphaned.
//
// Note, this must be done after any schema version updates to
// ensure our DBSchema methods work correctly.
if (MarkerFileExists(aQuotaInfo)) {
NS_WARNING("Cache not shutdown cleanly! Cleaning up stale data...");
mozStorageTransaction trans(aConn, false,
mozIStorageConnection::TRANSACTION_IMMEDIATE);
// Clean up orphaned Cache objects
AutoTArray<CacheId, 8> orphanedCacheIdList;
nsresult rv = db::FindOrphanedCacheIds(aConn, orphanedCacheIdList);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
int64_t overallDeletedPaddingSize = 0;
for (uint32_t i = 0; i < orphanedCacheIdList.Length(); ++i) {
AutoTArray<nsID, 16> deletedBodyIdList;
int64_t deletedPaddingSize = 0;
rv = db::DeleteCacheId(aConn, orphanedCacheIdList[i], deletedBodyIdList,
&deletedPaddingSize);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = BodyDeleteFiles(aQuotaInfo, aDBDir, deletedBodyIdList);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (deletedPaddingSize > 0) {
DecreaseUsageForQuotaInfo(aQuotaInfo, deletedPaddingSize);
}
MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - deletedPaddingSize >=
overallDeletedPaddingSize);
overallDeletedPaddingSize += deletedPaddingSize;
}
// Clean up orphaned body objects
AutoTArray<nsID, 64> knownBodyIdList;
rv = db::GetKnownBodyIds(aConn, knownBodyIdList);
rv = BodyDeleteOrphanedFiles(aQuotaInfo, aDBDir, knownBodyIdList);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// Commit() explicitly here, because we want to ensure the padding file
// has the correct content.
rv = MaybeUpdatePaddingFile(
aDBDir, aConn, /* aIncreaceSize */ 0, overallDeletedPaddingSize,
[&trans]() mutable { return trans.Commit(); });
// We'll restore padding file below, so just warn here if failure happens.
Unused << NS_WARN_IF(NS_FAILED(rv));
}
if (DirectoryPaddingFileExists(aDBDir, DirPaddingFile::TMP_FILE) ||
!DirectoryPaddingFileExists(aDBDir, DirPaddingFile::FILE)) {
rv = RestorePaddingFile(aDBDir, aConn);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
return rv;
}
};
// ----------------------------------------------------------------------------
// Action that is executed when we determine that content has stopped using
// a body file that has been orphaned.
class DeleteOrphanedBodyAction final : public Action {
public:
using DeletedBodyIdList = AutoTArray<nsID, 64>;
explicit DeleteOrphanedBodyAction(DeletedBodyIdList&& aDeletedBodyIdList)
: mDeletedBodyIdList(std::move(aDeletedBodyIdList)) {}
explicit DeleteOrphanedBodyAction(const nsID& aBodyId)
: mDeletedBodyIdList{aBodyId} {}
void RunOnTarget(Resolver* aResolver, const QuotaInfo& aQuotaInfo,
Data*) override {
MOZ_DIAGNOSTIC_ASSERT(aResolver);
MOZ_DIAGNOSTIC_ASSERT(aQuotaInfo.mDir);
// Note that since DeleteOrphanedBodyAction isn't used while the context is
// being initialized, we don't need to check for cancellation here.
nsCOMPtr<nsIFile> dbDir;
nsresult rv = aQuotaInfo.mDir->Clone(getter_AddRefs(dbDir));
if (NS_WARN_IF(NS_FAILED(rv))) {
aResolver->Resolve(rv);
return;
}
rv = dbDir->Append(NS_LITERAL_STRING("cache"));
if (NS_WARN_IF(NS_FAILED(rv))) {
aResolver->Resolve(rv);
return;
}
rv = BodyDeleteFiles(aQuotaInfo, dbDir, mDeletedBodyIdList);
Unused << NS_WARN_IF(NS_FAILED(rv));
aResolver->Resolve(rv);
}
private:
DeletedBodyIdList mDeletedBodyIdList;
};
bool IsHeadRequest(const CacheRequest& aRequest,
const CacheQueryParams& aParams) {
return !aParams.ignoreMethod() &&
aRequest.method().LowerCaseEqualsLiteral("head");
}
bool IsHeadRequest(const Maybe<CacheRequest>& aRequest,
const CacheQueryParams& aParams) {
if (aRequest.isSome()) {
return !aParams.ignoreMethod() &&
aRequest.ref().method().LowerCaseEqualsLiteral("head");
}
return false;
}
} // namespace
// ----------------------------------------------------------------------------
// Singleton class to track Manager instances and ensure there is only
// one for each unique ManagerId.
class Manager::Factory {
public:
friend class StaticAutoPtr<Manager::Factory>;
static Result<SafeRefPtr<Manager>, nsresult> AcquireCreateIfNonExistent(
const SafeRefPtr<ManagerId>& aManagerId) {
mozilla::ipc::AssertIsOnBackgroundThread();
// Ensure there is a factory instance. This forces the Acquire() call
// below to use the same factory.
nsresult rv = MaybeCreateInstance();
if (NS_WARN_IF(NS_FAILED(rv))) {
return Err(rv);
}
SafeRefPtr<Manager> ref = Acquire(*aManagerId);
if (!ref) {
// TODO: replace this with a thread pool (bug 1119864)
nsCOMPtr<nsIThread> ioThread;
rv = NS_NewNamedThread("DOMCacheThread", getter_AddRefs(ioThread));
if (NS_WARN_IF(NS_FAILED(rv))) {
return Err(rv);
}
ref = MakeSafeRefPtr<Manager>(aManagerId.clonePtr(), ioThread,
ConstructorGuard{});
// There may be an old manager for this origin in the process of
// cleaning up. We need to tell the new manager about this so
// that it won't actually start until the old manager is done.
SafeRefPtr<Manager> oldManager = Acquire(*aManagerId, Closing);
ref->Init(oldManager ? SomeRef(*oldManager) : Nothing());
MOZ_ASSERT(!sFactory->mManagerList.Contains(ref));
sFactory->mManagerList.AppendElement(ref.unsafeGetRawPtr());
}
return ref;
}
static void Remove(Manager& aManager) {
mozilla::ipc::AssertIsOnBackgroundThread();
MOZ_DIAGNOSTIC_ASSERT(sFactory);
MOZ_ALWAYS_TRUE(sFactory->mManagerList.RemoveElement(&aManager));
// clean up the factory singleton if there are no more managers
MaybeDestroyInstance();
}
static void Abort(const nsACString& aOrigin) {
mozilla::ipc::AssertIsOnBackgroundThread();
if (!sFactory) {
return;
}
MOZ_DIAGNOSTIC_ASSERT(!sFactory->mManagerList.IsEmpty());
{
// Note that we are synchronously calling abort code here. If any
// of the shutdown code synchronously decides to delete the Factory
// we need to delay that delete until the end of this method.
AutoRestore<bool> restore(sFactory->mInSyncAbortOrShutdown);
sFactory->mInSyncAbortOrShutdown = true;
for (auto* manager : sFactory->mManagerList.ForwardRange()) {
if (aOrigin.IsVoid() || manager->mManagerId->QuotaOrigin() == aOrigin) {
auto pinnedManager =
SafeRefPtr{manager, AcquireStrongRefFromRawPtr{}};
pinnedManager->Abort();
}
}
}
MaybeDestroyInstance();
}
static void ShutdownAll() {
mozilla::ipc::AssertIsOnBackgroundThread();
if (!sFactory) {
return;
}
MOZ_DIAGNOSTIC_ASSERT(!sFactory->mManagerList.IsEmpty());
{
// Note that we are synchronously calling shutdown code here. If any
// of the shutdown code synchronously decides to delete the Factory
// we need to delay that delete until the end of this method.
AutoRestore<bool> restore(sFactory->mInSyncAbortOrShutdown);
sFactory->mInSyncAbortOrShutdown = true;
for (auto* manager : sFactory->mManagerList.ForwardRange()) {
auto pinnedManager = SafeRefPtr{manager, AcquireStrongRefFromRawPtr{}};
pinnedManager->Shutdown();
}
}
MaybeDestroyInstance();
}
static bool IsShutdownAllComplete() {
mozilla::ipc::AssertIsOnBackgroundThread();
return !sFactory;
}
private:
Factory() : mInSyncAbortOrShutdown(false) {
MOZ_COUNT_CTOR(cache::Manager::Factory);
}
~Factory() {
MOZ_COUNT_DTOR(cache::Manager::Factory);
MOZ_DIAGNOSTIC_ASSERT(mManagerList.IsEmpty());
MOZ_DIAGNOSTIC_ASSERT(!mInSyncAbortOrShutdown);
}
static nsresult MaybeCreateInstance() {
mozilla::ipc::AssertIsOnBackgroundThread();
if (!sFactory) {
// Be clear about what we are locking. sFactory is bg thread only, so
// we don't need to lock it here. Just protect sFactoryShutdown and
// sBackgroundThread.
{
StaticMutexAutoLock lock(sMutex);
if (sFactoryShutdown) {
return NS_ERROR_ILLEGAL_DURING_SHUTDOWN;
}
}
// We cannot use ClearOnShutdown() here because we're not on the main
// thread. Instead, we delete sFactory in Factory::Remove() after the
// last manager is removed. ShutdownObserver ensures this happens
// before shutdown.
sFactory = new Factory();
}
// Never return sFactory to code outside Factory. We need to delete it
// out from under ourselves just before we return from Remove(). This
// would be (even more) dangerous if other code had a pointer to the
// factory itself.
return NS_OK;
}
static void MaybeDestroyInstance() {
mozilla::ipc::AssertIsOnBackgroundThread();
MOZ_DIAGNOSTIC_ASSERT(sFactory);
// If the factory is is still in use then we cannot delete yet. This
// could be due to managers still existing or because we are in the
// middle of aborting or shutting down. We need to be careful not to delete
// ourself synchronously during shutdown.
if (!sFactory->mManagerList.IsEmpty() || sFactory->mInSyncAbortOrShutdown) {
return;
}
sFactory = nullptr;
}
static SafeRefPtr<Manager> Acquire(const ManagerId& aManagerId,
State aState = Open) {
mozilla::ipc::AssertIsOnBackgroundThread();
nsresult rv = MaybeCreateInstance();
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
// Iterate in reverse to find the most recent, matching Manager. This
// is important when looking for a Closing Manager. If a new Manager
// chains to an old Manager we want it to be the most recent one.
// XXX We could use a reversed NonObservingRange here and std::find_if.
for (auto* manager : sFactory->mManagerList.BackwardRange()) {
if (aState == manager->GetState() && *manager->mManagerId == aManagerId) {
return {manager, AcquireStrongRefFromRawPtr{}};
}
}
return nullptr;
}
// Singleton created on demand and deleted when last Manager is cleared
// in Remove().
// PBackground thread only.
static StaticAutoPtr<Factory> sFactory;
// protects following static attribute
static StaticMutex sMutex;
// Indicate if shutdown has occurred to block re-creation of sFactory.
// Must hold sMutex to access.
static bool sFactoryShutdown;
// Weak references as we don't want to keep Manager objects alive forever.
// When a Manager is destroyed it calls Factory::Remove() to clear itself.
// PBackground thread only.
nsTObserverArray<Manager*> mManagerList;
// This flag is set when we are looping through the list and calling Abort()
// or Shutdown() on each Manager. We need to be careful not to synchronously
// trigger the deletion of the factory while still executing this loop.
bool mInSyncAbortOrShutdown;
};
// static
StaticAutoPtr<Manager::Factory> Manager::Factory::sFactory;
// static
StaticMutex Manager::Factory::sMutex;
// static
bool Manager::Factory::sFactoryShutdown = false;
// ----------------------------------------------------------------------------
// Abstract class to help implement the various Actions. The vast majority
// of Actions are synchronous and need to report back to a Listener on the
// Manager.
class Manager::BaseAction : public SyncDBAction {
protected:
BaseAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId)
: SyncDBAction(DBAction::Existing),
mManager(std::move(aManager)),
mListenerId(aListenerId) {}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) = 0;
virtual void CompleteOnInitiatingThread(nsresult aRv) override {
NS_ASSERT_OWNINGTHREAD(Manager::BaseAction);
Listener* listener = mManager->GetListener(mListenerId);
if (listener) {
Complete(listener, ErrorResult(aRv));
}
// ensure we release the manager on the initiating thread
mManager = nullptr;
}
SafeRefPtr<Manager> mManager;
const ListenerId mListenerId;
};
// ----------------------------------------------------------------------------
// Action that is executed when we determine that content has stopped using
// a Cache object that has been orphaned.
class Manager::DeleteOrphanedCacheAction final : public SyncDBAction {
public:
DeleteOrphanedCacheAction(SafeRefPtr<Manager> aManager, CacheId aCacheId)
: SyncDBAction(DBAction::Existing),
mManager(std::move(aManager)),
mCacheId(aCacheId),
mDeletedPaddingSize(0) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
mQuotaInfo.emplace(aQuotaInfo);
mozStorageTransaction trans(aConn, false,
mozIStorageConnection::TRANSACTION_IMMEDIATE);
nsresult rv = db::DeleteCacheId(aConn, mCacheId, mDeletedBodyIdList,
&mDeletedPaddingSize);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = MaybeUpdatePaddingFile(aDBDir, aConn, /* aIncreaceSize */ 0,
mDeletedPaddingSize,
[&trans]() mutable { return trans.Commit(); });
Unused << NS_WARN_IF(NS_FAILED(rv));
return rv;
}
virtual void CompleteOnInitiatingThread(nsresult aRv) override {
// If the transaction fails, we shouldn't delete the body files and decrease
// their padding size.
if (NS_FAILED(aRv)) {
mDeletedBodyIdList.Clear();
mDeletedPaddingSize = 0;
}
mManager->NoteOrphanedBodyIdList(mDeletedBodyIdList);
if (mDeletedPaddingSize > 0) {
DecreaseUsageForQuotaInfo(mQuotaInfo.ref(), mDeletedPaddingSize);
}
// ensure we release the manager on the initiating thread
mManager = nullptr;
}
private:
SafeRefPtr<Manager> mManager;
const CacheId mCacheId;
nsTArray<nsID> mDeletedBodyIdList;
Maybe<QuotaInfo> mQuotaInfo;
// Track any pad amount associated with orphaned entries.
int64_t mDeletedPaddingSize;
};
// ----------------------------------------------------------------------------
class Manager::CacheMatchAction final : public Manager::BaseAction {
public:
CacheMatchAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId,
CacheId aCacheId, const CacheMatchArgs& aArgs,
SafeRefPtr<StreamList> aStreamList)
: BaseAction(std::move(aManager), aListenerId),
mCacheId(aCacheId),
mArgs(aArgs),
mStreamList(std::move(aStreamList)),
mFoundResponse(false) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
nsresult rv = db::CacheMatch(aConn, mCacheId, mArgs.request(),
mArgs.params(), &mFoundResponse, &mResponse);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (!mFoundResponse || !mResponse.mHasBodyId ||
IsHeadRequest(mArgs.request(), mArgs.params())) {
mResponse.mHasBodyId = false;
return rv;
}
nsCOMPtr<nsIInputStream> stream;
if (mArgs.openMode() == OpenMode::Eager) {
rv = BodyOpen(aQuotaInfo, aDBDir, mResponse.mBodyId,
getter_AddRefs(stream));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (NS_WARN_IF(!stream)) {
return NS_ERROR_FILE_NOT_FOUND;
}
}
mStreamList->Add(mResponse.mBodyId, std::move(stream));
return rv;
}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) override {
if (!mFoundResponse) {
aListener->OnOpComplete(std::move(aRv), CacheMatchResult(Nothing()));
} else {
mStreamList->Activate(mCacheId);
aListener->OnOpComplete(std::move(aRv), CacheMatchResult(Nothing()),
mResponse, *mStreamList);
}
mStreamList = nullptr;
}
virtual bool MatchesCacheId(CacheId aCacheId) const override {
return aCacheId == mCacheId;
}
private:
const CacheId mCacheId;
const CacheMatchArgs mArgs;
SafeRefPtr<StreamList> mStreamList;
bool mFoundResponse;
SavedResponse mResponse;
};
// ----------------------------------------------------------------------------
class Manager::CacheMatchAllAction final : public Manager::BaseAction {
public:
CacheMatchAllAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId,
CacheId aCacheId, const CacheMatchAllArgs& aArgs,
SafeRefPtr<StreamList> aStreamList)
: BaseAction(std::move(aManager), aListenerId),
mCacheId(aCacheId),
mArgs(aArgs),
mStreamList(std::move(aStreamList)) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
nsresult rv = db::CacheMatchAll(aConn, mCacheId, mArgs.maybeRequest(),
mArgs.params(), mSavedResponses);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
for (uint32_t i = 0; i < mSavedResponses.Length(); ++i) {
if (!mSavedResponses[i].mHasBodyId ||
IsHeadRequest(mArgs.maybeRequest(), mArgs.params())) {
mSavedResponses[i].mHasBodyId = false;
continue;
}
nsCOMPtr<nsIInputStream> stream;
if (mArgs.openMode() == OpenMode::Eager) {
rv = BodyOpen(aQuotaInfo, aDBDir, mSavedResponses[i].mBodyId,
getter_AddRefs(stream));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (NS_WARN_IF(!stream)) {
return NS_ERROR_FILE_NOT_FOUND;
}
}
mStreamList->Add(mSavedResponses[i].mBodyId, std::move(stream));
}
return rv;
}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) override {
mStreamList->Activate(mCacheId);
aListener->OnOpComplete(std::move(aRv), CacheMatchAllResult(),
mSavedResponses, *mStreamList);
mStreamList = nullptr;
}
virtual bool MatchesCacheId(CacheId aCacheId) const override {
return aCacheId == mCacheId;
}
private:
const CacheId mCacheId;
const CacheMatchAllArgs mArgs;
SafeRefPtr<StreamList> mStreamList;
nsTArray<SavedResponse> mSavedResponses;
};
// ----------------------------------------------------------------------------
// This is the most complex Action. It puts a request/response pair into the
// Cache. It does not complete until all of the body data has been saved to
// disk. This means its an asynchronous Action.
class Manager::CachePutAllAction final : public DBAction {
public:
CachePutAllAction(
SafeRefPtr<Manager> aManager, ListenerId aListenerId, CacheId aCacheId,
const nsTArray<CacheRequestResponse>& aPutList,
const nsTArray<nsCOMPtr<nsIInputStream>>& aRequestStreamList,
const nsTArray<nsCOMPtr<nsIInputStream>>& aResponseStreamList)
: DBAction(DBAction::Existing),
mManager(std::move(aManager)),
mListenerId(aListenerId),
mCacheId(aCacheId),
mList(aPutList.Length()),
mExpectedAsyncCopyCompletions(1),
mAsyncResult(NS_OK),
mMutex("cache::Manager::CachePutAllAction"),
mUpdatedPaddingSize(0),
mDeletedPaddingSize(0) {
MOZ_DIAGNOSTIC_ASSERT(!aPutList.IsEmpty());
MOZ_DIAGNOSTIC_ASSERT(aPutList.Length() == aRequestStreamList.Length());
MOZ_DIAGNOSTIC_ASSERT(aPutList.Length() == aResponseStreamList.Length());
for (uint32_t i = 0; i < aPutList.Length(); ++i) {
Entry* entry = mList.AppendElement();
entry->mRequest = aPutList[i].request();
entry->mRequestStream = aRequestStreamList[i];
entry->mResponse = aPutList[i].response();
entry->mResponseStream = aResponseStreamList[i];
}
}
private:
~CachePutAllAction() = default;
virtual void RunWithDBOnTarget(Resolver* aResolver,
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
MOZ_DIAGNOSTIC_ASSERT(aResolver);
MOZ_DIAGNOSTIC_ASSERT(aDBDir);
MOZ_DIAGNOSTIC_ASSERT(aConn);
MOZ_DIAGNOSTIC_ASSERT(!mResolver);
MOZ_DIAGNOSTIC_ASSERT(!mDBDir);
MOZ_DIAGNOSTIC_ASSERT(!mConn);
MOZ_DIAGNOSTIC_ASSERT(!mTarget);
mTarget = GetCurrentThreadSerialEventTarget();
MOZ_DIAGNOSTIC_ASSERT(mTarget);
// We should be pre-initialized to expect one async completion. This is
// the "manual" completion we call at the end of this method in all
// cases.
MOZ_DIAGNOSTIC_ASSERT(mExpectedAsyncCopyCompletions == 1);
mResolver = aResolver;
mDBDir = aDBDir;
mConn = aConn;
mQuotaInfo.emplace(aQuotaInfo);
// File bodies are streamed to disk via asynchronous copying. Start
// this copying now. Each copy will eventually result in a call
// to OnAsyncCopyComplete().
nsresult rv = NS_OK;
for (uint32_t i = 0; i < mList.Length(); ++i) {
rv = StartStreamCopy(aQuotaInfo, mList[i], RequestStream,
&mExpectedAsyncCopyCompletions);
if (NS_WARN_IF(NS_FAILED(rv))) {
break;
}
rv = StartStreamCopy(aQuotaInfo, mList[i], ResponseStream,
&mExpectedAsyncCopyCompletions);
if (NS_WARN_IF(NS_FAILED(rv))) {
break;
}
}
// Always call OnAsyncCopyComplete() manually here. This covers the
// case where there is no async copying and also reports any startup
// errors correctly. If we hit an error, then OnAsyncCopyComplete()
// will cancel any async copying.
OnAsyncCopyComplete(rv);
}
// Called once for each asynchronous file copy whether it succeeds or
// fails. If a file copy is canceled, it still calls this method with
// an error code.
void OnAsyncCopyComplete(nsresult aRv) {
MOZ_ASSERT(mTarget->IsOnCurrentThread());
MOZ_DIAGNOSTIC_ASSERT(mConn);
MOZ_DIAGNOSTIC_ASSERT(mResolver);
MOZ_DIAGNOSTIC_ASSERT(mExpectedAsyncCopyCompletions > 0);
// Explicitly check for cancellation here to catch a race condition.
// Consider:
//
// 1) NS_AsyncCopy() executes on IO thread, but has not saved its
// copy context yet.
// 2) CancelAllStreamCopying() occurs on PBackground thread
// 3) Copy context from (1) is saved on IO thread.
//
// Checking for cancellation here catches this condition when we
// first call OnAsyncCopyComplete() manually from RunWithDBOnTarget().
//
// This explicit cancellation check also handles the case where we
// are canceled just after all stream copying completes. We should
// abort the synchronous DB operations in this case if we have not
// started them yet.
if (NS_SUCCEEDED(aRv) && IsCanceled()) {
aRv = NS_ERROR_ABORT;
}
// If any of the async copies fail, we need to still wait for them all to
// complete. Cancel any other streams still working and remember the
// error. All canceled streams will call OnAsyncCopyComplete().
if (NS_FAILED(aRv) && NS_SUCCEEDED(mAsyncResult)) {
CancelAllStreamCopying();
mAsyncResult = aRv;
}
// Check to see if async copying is still on-going. If so, then simply
// return for now. We must wait for a later OnAsyncCopyComplete() call.
mExpectedAsyncCopyCompletions -= 1;
if (mExpectedAsyncCopyCompletions > 0) {
return;
}
// We have finished with all async copying. Indicate this by clearing all
// our copy contexts.
{
MutexAutoLock lock(mMutex);
mCopyContextList.Clear();
}
// An error occurred while async copying. Terminate the Action.
// DoResolve() will clean up any files we may have written.
if (NS_FAILED(mAsyncResult)) {
DoResolve(mAsyncResult);
return;
}
mozStorageTransaction trans(mConn, false,
mozIStorageConnection::TRANSACTION_IMMEDIATE);
nsresult rv = NS_OK;
for (uint32_t i = 0; i < mList.Length(); ++i) {
Entry& e = mList[i];
if (e.mRequestStream) {
rv = BodyFinalizeWrite(mDBDir, e.mRequestBodyId);
if (NS_WARN_IF(NS_FAILED(rv))) {
DoResolve(rv);
return;
}
}
if (e.mResponseStream) {
// Gerenate padding size for opaque response if needed.
if (e.mResponse.type() == ResponseType::Opaque) {
// It'll generate padding if we've not set it yet.
rv = BodyMaybeUpdatePaddingSize(
mQuotaInfo.ref(), mDBDir, e.mResponseBodyId,
e.mResponse.paddingInfo(), &e.mResponse.paddingSize());
if (NS_WARN_IF(NS_FAILED(rv))) {
DoResolve(rv);
return;
}
MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - e.mResponse.paddingSize() >=
mUpdatedPaddingSize);
mUpdatedPaddingSize += e.mResponse.paddingSize();
}
rv = BodyFinalizeWrite(mDBDir, e.mResponseBodyId);
if (NS_WARN_IF(NS_FAILED(rv))) {
DoResolve(rv);
return;
}
}
int64_t deletedPaddingSize = 0;
rv = db::CachePut(mConn, mCacheId, e.mRequest,
e.mRequestStream ? &e.mRequestBodyId : nullptr,
e.mResponse,
e.mResponseStream ? &e.mResponseBodyId : nullptr,
mDeletedBodyIdList, &deletedPaddingSize);
if (NS_WARN_IF(NS_FAILED(rv))) {
DoResolve(rv);
return;
}
MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - mDeletedPaddingSize >=
deletedPaddingSize);
mDeletedPaddingSize += deletedPaddingSize;
}
// Update padding file when it's necessary
rv = MaybeUpdatePaddingFile(mDBDir, mConn, mUpdatedPaddingSize,
mDeletedPaddingSize,
[&trans]() mutable { return trans.Commit(); });
Unused << NS_WARN_IF(NS_FAILED(rv));
DoResolve(rv);
}
virtual void CompleteOnInitiatingThread(nsresult aRv) override {
NS_ASSERT_OWNINGTHREAD(Action);
for (uint32_t i = 0; i < mList.Length(); ++i) {
mList[i].mRequestStream = nullptr;
mList[i].mResponseStream = nullptr;
}
// If the transaction fails, we shouldn't delete the body files and decrease
// their padding size.
if (NS_FAILED(aRv)) {
mDeletedBodyIdList.Clear();
mDeletedPaddingSize = 0;
}
mManager->NoteOrphanedBodyIdList(mDeletedBodyIdList);
if (mDeletedPaddingSize > 0) {
DecreaseUsageForQuotaInfo(mQuotaInfo.ref(), mDeletedPaddingSize);
}
Listener* listener = mManager->GetListener(mListenerId);
mManager = nullptr;
if (listener) {
listener->OnOpComplete(ErrorResult(aRv), CachePutAllResult());
}
}
virtual void CancelOnInitiatingThread() override {
NS_ASSERT_OWNINGTHREAD(Action);
Action::CancelOnInitiatingThread();
CancelAllStreamCopying();
}
virtual bool MatchesCacheId(CacheId aCacheId) const override {
NS_ASSERT_OWNINGTHREAD(Action);
return aCacheId == mCacheId;
}
struct Entry {
CacheRequest mRequest;
nsCOMPtr<nsIInputStream> mRequestStream;
nsID mRequestBodyId;
nsCOMPtr<nsISupports> mRequestCopyContext;
CacheResponse mResponse;
nsCOMPtr<nsIInputStream> mResponseStream;
nsID mResponseBodyId;
nsCOMPtr<nsISupports> mResponseCopyContext;
};
enum StreamId { RequestStream, ResponseStream };
nsresult StartStreamCopy(const QuotaInfo& aQuotaInfo, Entry& aEntry,
StreamId aStreamId, uint32_t* aCopyCountOut) {
MOZ_ASSERT(mTarget->IsOnCurrentThread());
MOZ_DIAGNOSTIC_ASSERT(aCopyCountOut);
if (IsCanceled()) {
return NS_ERROR_ABORT;
}
nsCOMPtr<nsIInputStream> source;
nsID* bodyId;
if (aStreamId == RequestStream) {
source = aEntry.mRequestStream;
bodyId = &aEntry.mRequestBodyId;
} else {
MOZ_DIAGNOSTIC_ASSERT(aStreamId == ResponseStream);
source = aEntry.mResponseStream;
bodyId = &aEntry.mResponseBodyId;
}
if (!source) {
return NS_OK;
}
nsCOMPtr<nsISupports> copyContext;
nsresult rv = BodyStartWriteStream(aQuotaInfo, mDBDir, source, this,
AsyncCopyCompleteFunc, bodyId,
getter_AddRefs(copyContext));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mBodyIdWrittenList.AppendElement(*bodyId);
if (copyContext) {
MutexAutoLock lock(mMutex);
mCopyContextList.AppendElement(copyContext);
}
*aCopyCountOut += 1;
return rv;
}
void CancelAllStreamCopying() {
// May occur on either owning thread or target thread
MutexAutoLock lock(mMutex);
for (uint32_t i = 0; i < mCopyContextList.Length(); ++i) {
BodyCancelWrite(mDBDir, mCopyContextList[i]);
}
mCopyContextList.Clear();
}
static void AsyncCopyCompleteFunc(void* aClosure, nsresult aRv) {
// May be on any thread, including STS event target.
MOZ_DIAGNOSTIC_ASSERT(aClosure);
// Weak ref as we are guaranteed to the action is alive until
// CompleteOnInitiatingThread is called.
CachePutAllAction* action = static_cast<CachePutAllAction*>(aClosure);
action->CallOnAsyncCopyCompleteOnTargetThread(aRv);
}
void CallOnAsyncCopyCompleteOnTargetThread(nsresult aRv) {
// May be on any thread, including STS event target. Non-owning runnable
// here since we are guaranteed the Action will survive until
// CompleteOnInitiatingThread is called.
nsCOMPtr<nsIRunnable> runnable = NewNonOwningRunnableMethod<nsresult>(
"dom::cache::Manager::CachePutAllAction::OnAsyncCopyComplete", this,
&CachePutAllAction::OnAsyncCopyComplete, aRv);
MOZ_ALWAYS_SUCCEEDS(
mTarget->Dispatch(runnable.forget(), nsIThread::DISPATCH_NORMAL));
}
void DoResolve(nsresult aRv) {
MOZ_ASSERT(mTarget->IsOnCurrentThread());
// DoResolve() must not be called until all async copying has completed.
#ifdef DEBUG
{
MutexAutoLock lock(mMutex);
MOZ_ASSERT(mCopyContextList.IsEmpty());
}
#endif
// Clean up any files we might have written before hitting the error.
if (NS_FAILED(aRv)) {
BodyDeleteFiles(mQuotaInfo.ref(), mDBDir, mBodyIdWrittenList);
if (mUpdatedPaddingSize > 0) {
DecreaseUsageForQuotaInfo(mQuotaInfo.ref(), mUpdatedPaddingSize);
}
}
// Must be released on the target thread where it was opened.
mConn = nullptr;
// Drop our ref to the target thread as we are done with this thread.
// Also makes our thread assertions catch any incorrect method calls
// after resolve.
mTarget = nullptr;
// Make sure to de-ref the resolver per the Action API contract.
RefPtr<Action::Resolver> resolver;
mResolver.swap(resolver);
resolver->Resolve(aRv);
}
// initiating thread only
SafeRefPtr<Manager> mManager;
const ListenerId mListenerId;
// Set on initiating thread, read on target thread. State machine guarantees
// these are not modified while being read by the target thread.
const CacheId mCacheId;
nsTArray<Entry> mList;
uint32_t mExpectedAsyncCopyCompletions;
// target thread only
RefPtr<Resolver> mResolver;
nsCOMPtr<nsIFile> mDBDir;
nsCOMPtr<mozIStorageConnection> mConn;
nsCOMPtr<nsISerialEventTarget> mTarget;
nsresult mAsyncResult;
nsTArray<nsID> mBodyIdWrittenList;
// Written to on target thread, accessed on initiating thread after target
// thread activity is guaranteed complete
nsTArray<nsID> mDeletedBodyIdList;
// accessed from any thread while mMutex locked
Mutex mMutex;
nsTArray<nsCOMPtr<nsISupports>> mCopyContextList;
Maybe<QuotaInfo> mQuotaInfo;
// Track how much pad amount has been added for new entries so that it can be
// removed if an error occurs.
int64_t mUpdatedPaddingSize;
// Track any pad amount associated with overwritten entries.
int64_t mDeletedPaddingSize;
};
// ----------------------------------------------------------------------------
class Manager::CacheDeleteAction final : public Manager::BaseAction {
public:
CacheDeleteAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId,
CacheId aCacheId, const CacheDeleteArgs& aArgs)
: BaseAction(std::move(aManager), aListenerId),
mCacheId(aCacheId),
mArgs(aArgs),
mSuccess(false),
mDeletedPaddingSize(0) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
mQuotaInfo.emplace(aQuotaInfo);
mozStorageTransaction trans(aConn, false,
mozIStorageConnection::TRANSACTION_IMMEDIATE);
nsresult rv =
db::CacheDelete(aConn, mCacheId, mArgs.request(), mArgs.params(),
mDeletedBodyIdList, &mDeletedPaddingSize, &mSuccess);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = MaybeUpdatePaddingFile(aDBDir, aConn, /* aIncreaceSize */ 0,
mDeletedPaddingSize,
[&trans]() mutable { return trans.Commit(); });
if (NS_WARN_IF(NS_FAILED(rv))) {
mSuccess = false;
return rv;
}
return rv;
}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) override {
// If the transaction fails, we shouldn't delete the body files and decrease
// their padding size.
if (aRv.Failed()) {
mDeletedBodyIdList.Clear();
mDeletedPaddingSize = 0;
}
mManager->NoteOrphanedBodyIdList(mDeletedBodyIdList);
if (mDeletedPaddingSize > 0) {
DecreaseUsageForQuotaInfo(mQuotaInfo.ref(), mDeletedPaddingSize);
}
aListener->OnOpComplete(std::move(aRv), CacheDeleteResult(mSuccess));
}
virtual bool MatchesCacheId(CacheId aCacheId) const override {
return aCacheId == mCacheId;
}
private:
const CacheId mCacheId;
const CacheDeleteArgs mArgs;
bool mSuccess;
nsTArray<nsID> mDeletedBodyIdList;
Maybe<QuotaInfo> mQuotaInfo;
// Track any pad amount associated with deleted entries.
int64_t mDeletedPaddingSize;
};
// ----------------------------------------------------------------------------
class Manager::CacheKeysAction final : public Manager::BaseAction {
public:
CacheKeysAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId,
CacheId aCacheId, const CacheKeysArgs& aArgs,
SafeRefPtr<StreamList> aStreamList)
: BaseAction(std::move(aManager), aListenerId),
mCacheId(aCacheId),
mArgs(aArgs),
mStreamList(std::move(aStreamList)) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
nsresult rv = db::CacheKeys(aConn, mCacheId, mArgs.maybeRequest(),
mArgs.params(), mSavedRequests);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
for (uint32_t i = 0; i < mSavedRequests.Length(); ++i) {
if (!mSavedRequests[i].mHasBodyId ||
IsHeadRequest(mArgs.maybeRequest(), mArgs.params())) {
mSavedRequests[i].mHasBodyId = false;
continue;
}
nsCOMPtr<nsIInputStream> stream;
if (mArgs.openMode() == OpenMode::Eager) {
rv = BodyOpen(aQuotaInfo, aDBDir, mSavedRequests[i].mBodyId,
getter_AddRefs(stream));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (NS_WARN_IF(!stream)) {
return NS_ERROR_FILE_NOT_FOUND;
}
}
mStreamList->Add(mSavedRequests[i].mBodyId, std::move(stream));
}
return rv;
}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) override {
mStreamList->Activate(mCacheId);
aListener->OnOpComplete(std::move(aRv), CacheKeysResult(), mSavedRequests,
*mStreamList);
mStreamList = nullptr;
}
virtual bool MatchesCacheId(CacheId aCacheId) const override {
return aCacheId == mCacheId;
}
private:
const CacheId mCacheId;
const CacheKeysArgs mArgs;
SafeRefPtr<StreamList> mStreamList;
nsTArray<SavedRequest> mSavedRequests;
};
// ----------------------------------------------------------------------------
class Manager::StorageMatchAction final : public Manager::BaseAction {
public:
StorageMatchAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId,
Namespace aNamespace, const StorageMatchArgs& aArgs,
SafeRefPtr<StreamList> aStreamList)
: BaseAction(std::move(aManager), aListenerId),
mNamespace(aNamespace),
mArgs(aArgs),
mStreamList(std::move(aStreamList)),
mFoundResponse(false) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
nsresult rv =
db::StorageMatch(aConn, mNamespace, mArgs.request(), mArgs.params(),
&mFoundResponse, &mSavedResponse);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (!mFoundResponse || !mSavedResponse.mHasBodyId ||
IsHeadRequest(mArgs.request(), mArgs.params())) {
mSavedResponse.mHasBodyId = false;
return rv;
}
nsCOMPtr<nsIInputStream> stream;
if (mArgs.openMode() == OpenMode::Eager) {
rv = BodyOpen(aQuotaInfo, aDBDir, mSavedResponse.mBodyId,
getter_AddRefs(stream));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (NS_WARN_IF(!stream)) {
return NS_ERROR_FILE_NOT_FOUND;
}
}
mStreamList->Add(mSavedResponse.mBodyId, std::move(stream));
return rv;
}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) override {
if (!mFoundResponse) {
aListener->OnOpComplete(std::move(aRv), StorageMatchResult(Nothing()));
} else {
mStreamList->Activate(mSavedResponse.mCacheId);
aListener->OnOpComplete(std::move(aRv), StorageMatchResult(Nothing()),
mSavedResponse, *mStreamList);
}
mStreamList = nullptr;
}
private:
const Namespace mNamespace;
const StorageMatchArgs mArgs;
SafeRefPtr<StreamList> mStreamList;
bool mFoundResponse;
SavedResponse mSavedResponse;
};
// ----------------------------------------------------------------------------
class Manager::StorageHasAction final : public Manager::BaseAction {
public:
StorageHasAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId,
Namespace aNamespace, const StorageHasArgs& aArgs)
: BaseAction(std::move(aManager), aListenerId),
mNamespace(aNamespace),
mArgs(aArgs),
mCacheFound(false) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
CacheId cacheId;
return db::StorageGetCacheId(aConn, mNamespace, mArgs.key(), &mCacheFound,
&cacheId);
}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) override {
aListener->OnOpComplete(std::move(aRv), StorageHasResult(mCacheFound));
}
private:
const Namespace mNamespace;
const StorageHasArgs mArgs;
bool mCacheFound;
};
// ----------------------------------------------------------------------------
class Manager::StorageOpenAction final : public Manager::BaseAction {
public:
StorageOpenAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId,
Namespace aNamespace, const StorageOpenArgs& aArgs)
: BaseAction(std::move(aManager), aListenerId),
mNamespace(aNamespace),
mArgs(aArgs),
mCacheId(INVALID_CACHE_ID) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
// Cache does not exist, create it instead
mozStorageTransaction trans(aConn, false,
mozIStorageConnection::TRANSACTION_IMMEDIATE);
// Look for existing cache
bool cacheFound;
nsresult rv = db::StorageGetCacheId(aConn, mNamespace, mArgs.key(),
&cacheFound, &mCacheId);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (cacheFound) {
MOZ_DIAGNOSTIC_ASSERT(mCacheId != INVALID_CACHE_ID);
return rv;
}
rv = db::CreateCacheId(aConn, &mCacheId);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = db::StoragePutCache(aConn, mNamespace, mArgs.key(), mCacheId);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = trans.Commit();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
MOZ_DIAGNOSTIC_ASSERT(mCacheId != INVALID_CACHE_ID);
return rv;
}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) override {
MOZ_DIAGNOSTIC_ASSERT(aRv.Failed() || mCacheId != INVALID_CACHE_ID);
aListener->OnOpComplete(std::move(aRv),
StorageOpenResult(nullptr, nullptr, mNamespace),
mCacheId);
}
private:
const Namespace mNamespace;
const StorageOpenArgs mArgs;
CacheId mCacheId;
};
// ----------------------------------------------------------------------------
class Manager::StorageDeleteAction final : public Manager::BaseAction {
public:
StorageDeleteAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId,
Namespace aNamespace, const StorageDeleteArgs& aArgs)
: BaseAction(std::move(aManager), aListenerId),
mNamespace(aNamespace),
mArgs(aArgs),
mCacheDeleted(false),
mCacheId(INVALID_CACHE_ID) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
mozStorageTransaction trans(aConn, false,
mozIStorageConnection::TRANSACTION_IMMEDIATE);
bool exists;
nsresult rv = db::StorageGetCacheId(aConn, mNamespace, mArgs.key(), &exists,
&mCacheId);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (!exists) {
mCacheDeleted = false;
return NS_OK;
}
// Don't delete the removing padding size here, we'll delete it on
// DeleteOrphanedCacheAction.
rv = db::StorageForgetCache(aConn, mNamespace, mArgs.key());
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = trans.Commit();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mCacheDeleted = true;
return rv;
}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) override {
if (mCacheDeleted) {
// If content is referencing this cache, mark it orphaned to be
// deleted later.
if (!mManager->SetCacheIdOrphanedIfRefed(mCacheId)) {
// no outstanding references, delete immediately
const auto pinnedContext =
SafeRefPtr{mManager->mContext, AcquireStrongRefFromRawPtr{}};
if (pinnedContext->IsCanceled()) {
pinnedContext->NoteOrphanedData();
} else {
pinnedContext->CancelForCacheId(mCacheId);
RefPtr<Action> action =
new DeleteOrphanedCacheAction(mManager.clonePtr(), mCacheId);
pinnedContext->Dispatch(action);
}
}
}
aListener->OnOpComplete(std::move(aRv), StorageDeleteResult(mCacheDeleted));
}
private:
const Namespace mNamespace;
const StorageDeleteArgs mArgs;
bool mCacheDeleted;
CacheId mCacheId;
};
// ----------------------------------------------------------------------------
class Manager::StorageKeysAction final : public Manager::BaseAction {
public:
StorageKeysAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId,
Namespace aNamespace)
: BaseAction(std::move(aManager), aListenerId), mNamespace(aNamespace) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
return db::StorageGetKeys(aConn, mNamespace, mKeys);
}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) override {
if (aRv.Failed()) {
mKeys.Clear();
}
aListener->OnOpComplete(std::move(aRv), StorageKeysResult(mKeys));
}
private:
const Namespace mNamespace;
nsTArray<nsString> mKeys;
};
// ----------------------------------------------------------------------------
class Manager::OpenStreamAction final : public Manager::BaseAction {
public:
OpenStreamAction(SafeRefPtr<Manager> aManager, ListenerId aListenerId,
InputStreamResolver&& aResolver, const nsID& aBodyId)
: BaseAction(std::move(aManager), aListenerId),
mResolver(std::move(aResolver)),
mBodyId(aBodyId) {}
virtual nsresult RunSyncWithDBOnTarget(
const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
mozIStorageConnection* aConn) override {
nsresult rv =
BodyOpen(aQuotaInfo, aDBDir, mBodyId, getter_AddRefs(mBodyStream));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (NS_WARN_IF(!mBodyStream)) {
return NS_ERROR_FILE_NOT_FOUND;
}
return rv;
}
virtual void Complete(Listener* aListener, ErrorResult&& aRv) override {
if (aRv.Failed()) {
// Ignore the reason for fail and just pass a null input stream to let it
// fail.
aRv.SuppressException();
mResolver(nullptr);
} else {
mResolver(std::move(mBodyStream));
}
mResolver = nullptr;
}
private:
InputStreamResolver mResolver;
const nsID mBodyId;
nsCOMPtr<nsIInputStream> mBodyStream;
};
// ----------------------------------------------------------------------------
// static
Manager::ListenerId Manager::sNextListenerId = 0;
void Manager::Listener::OnOpComplete(ErrorResult&& aRv,
const CacheOpResult& aResult) {
OnOpComplete(std::move(aRv), aResult, INVALID_CACHE_ID, Nothing());
}
void Manager::Listener::OnOpComplete(ErrorResult&& aRv,
const CacheOpResult& aResult,
CacheId aOpenedCacheId) {
OnOpComplete(std::move(aRv), aResult, aOpenedCacheId, Nothing());
}
void Manager::Listener::OnOpComplete(ErrorResult&& aRv,
const CacheOpResult& aResult,
const SavedResponse& aSavedResponse,
StreamList& aStreamList) {
AutoTArray<SavedResponse, 1> responseList;
responseList.AppendElement(aSavedResponse);
OnOpComplete(
std::move(aRv), aResult, INVALID_CACHE_ID,
Some(StreamInfo{responseList, nsTArray<SavedRequest>(), aStreamList}));
}
void Manager::Listener::OnOpComplete(
ErrorResult&& aRv, const CacheOpResult& aResult,
const nsTArray<SavedResponse>& aSavedResponseList,
StreamList& aStreamList) {
OnOpComplete(std::move(aRv), aResult, INVALID_CACHE_ID,
Some(StreamInfo{aSavedResponseList, nsTArray<SavedRequest>(),
aStreamList}));
}
void Manager::Listener::OnOpComplete(
ErrorResult&& aRv, const CacheOpResult& aResult,
const nsTArray<SavedRequest>& aSavedRequestList, StreamList& aStreamList) {
OnOpComplete(std::move(aRv), aResult, INVALID_CACHE_ID,
Some(StreamInfo{nsTArray<SavedResponse>(), aSavedRequestList,
aStreamList}));
}
// static
Result<SafeRefPtr<Manager>, nsresult> Manager::AcquireCreateIfNonExistent(
const SafeRefPtr<ManagerId>& aManagerId) {
mozilla::ipc::AssertIsOnBackgroundThread();
return Factory::AcquireCreateIfNonExistent(aManagerId);
}
// static
void Manager::ShutdownAll() {
mozilla::ipc::AssertIsOnBackgroundThread();
Factory::ShutdownAll();
if (!mozilla::SpinEventLoopUntil(
[]() { return Factory::IsShutdownAllComplete(); })) {
NS_WARNING("Something bad happened!");
}
}
// static
void Manager::Abort(const nsACString& aOrigin) {
mozilla::ipc::AssertIsOnBackgroundThread();
Factory::Abort(aOrigin);
}
void Manager::RemoveListener(Listener* aListener) {
NS_ASSERT_OWNINGTHREAD(Manager);
// There may not be a listener here in the case where an actor is killed
// before it can perform any actual async requests on Manager.
mListeners.RemoveElement(aListener, ListenerEntryListenerComparator());
MOZ_ASSERT(
!mListeners.Contains(aListener, ListenerEntryListenerComparator()));
MaybeAllowContextToClose();
}
void Manager::RemoveContext(Context& aContext) {
NS_ASSERT_OWNINGTHREAD(Manager);
MOZ_DIAGNOSTIC_ASSERT(mContext);
MOZ_DIAGNOSTIC_ASSERT(mContext == &aContext);
// Whether the Context destruction was triggered from the Manager going
// idle or the underlying storage being invalidated, we should know we
// are closing before the Context is destroyed.
MOZ_DIAGNOSTIC_ASSERT(mState == Closing);
// Before forgetting the Context, check to see if we have any outstanding
// cache or body objects waiting for deletion. If so, note that we've
// orphaned data so it will be cleaned up on the next open.
for (uint32_t i = 0; i < mCacheIdRefs.Length(); ++i) {
if (mCacheIdRefs[i].mOrphaned) {
aContext.NoteOrphanedData();
break;
}
}
for (uint32_t i = 0; i < mBodyIdRefs.Length(); ++i) {
if (mBodyIdRefs[i].mOrphaned) {
aContext.NoteOrphanedData();
break;
}
}
mContext = nullptr;
// Once the context is gone, we can immediately remove ourself from the
// Factory list. We don't need to block shutdown by staying in the list
// any more.
Factory::Remove(*this);
}
void Manager::NoteClosing() {
NS_ASSERT_OWNINGTHREAD(Manager);
// This can be called more than once legitimately through different paths.
mState = Closing;
}
Manager::State Manager::GetState() const {
NS_ASSERT_OWNINGTHREAD(Manager);
return mState;
}
void Manager::AddRefCacheId(CacheId aCacheId) {
NS_ASSERT_OWNINGTHREAD(Manager);
for (uint32_t i = 0; i < mCacheIdRefs.Length(); ++i) {
if (mCacheIdRefs[i].mCacheId == aCacheId) {
mCacheIdRefs[i].mCount += 1;
return;
}
}
CacheIdRefCounter* entry = mCacheIdRefs.AppendElement();
entry->mCacheId = aCacheId;
entry->mCount = 1;
entry->mOrphaned = false;
}
void Manager::ReleaseCacheId(CacheId aCacheId) {
NS_ASSERT_OWNINGTHREAD(Manager);
for (uint32_t i = 0; i < mCacheIdRefs.Length(); ++i) {
if (mCacheIdRefs[i].mCacheId == aCacheId) {
#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
uint32_t oldRef = mCacheIdRefs[i].mCount;
#endif
mCacheIdRefs[i].mCount -= 1;
MOZ_DIAGNOSTIC_ASSERT(mCacheIdRefs[i].mCount < oldRef);
if (mCacheIdRefs[i].mCount == 0) {
bool orphaned = mCacheIdRefs[i].mOrphaned;
mCacheIdRefs.RemoveElementAt(i);
const auto pinnedContext =
SafeRefPtr{mContext, AcquireStrongRefFromRawPtr{}};
// If the context is already gone, then orphan flag should have been
// set in RemoveContext().
if (orphaned && pinnedContext) {
if (pinnedContext->IsCanceled()) {
pinnedContext->NoteOrphanedData();
} else {
pinnedContext->CancelForCacheId(aCacheId);
RefPtr<Action> action =
new DeleteOrphanedCacheAction(SafeRefPtrFromThis(), aCacheId);
pinnedContext->Dispatch(action);
}
}
}
MaybeAllowContextToClose();
return;
}
}
MOZ_ASSERT_UNREACHABLE("Attempt to release CacheId that is not referenced!");
}
void Manager::AddRefBodyId(const nsID& aBodyId) {
NS_ASSERT_OWNINGTHREAD(Manager);
for (uint32_t i = 0; i < mBodyIdRefs.Length(); ++i) {
if (mBodyIdRefs[i].mBodyId == aBodyId) {
mBodyIdRefs[i].mCount += 1;
return;
}
}
BodyIdRefCounter* entry = mBodyIdRefs.AppendElement();
entry->mBodyId = aBodyId;
entry->mCount = 1;
entry->mOrphaned = false;
}
void Manager::ReleaseBodyId(const nsID& aBodyId) {
NS_ASSERT_OWNINGTHREAD(Manager);
for (uint32_t i = 0; i < mBodyIdRefs.Length(); ++i) {
if (mBodyIdRefs[i].mBodyId == aBodyId) {
#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
uint32_t oldRef = mBodyIdRefs[i].mCount;
#endif
mBodyIdRefs[i].mCount -= 1;
MOZ_DIAGNOSTIC_ASSERT(mBodyIdRefs[i].mCount < oldRef);
if (mBodyIdRefs[i].mCount < 1) {
bool orphaned = mBodyIdRefs[i].mOrphaned;
mBodyIdRefs.RemoveElementAt(i);
const auto pinnedContext =
SafeRefPtr{mContext, AcquireStrongRefFromRawPtr{}};
// If the context is already gone, then orphan flag should have been
// set in RemoveContext().
if (orphaned && pinnedContext) {
if (pinnedContext->IsCanceled()) {
pinnedContext->NoteOrphanedData();
} else {
RefPtr<Action> action = new DeleteOrphanedBodyAction(aBodyId);
pinnedContext->Dispatch(action);
}
}
}
MaybeAllowContextToClose();
return;
}
}
MOZ_ASSERT_UNREACHABLE("Attempt to release BodyId that is not referenced!");
}
const ManagerId& Manager::GetManagerId() const { return *mManagerId; }
void Manager::AddStreamList(StreamList* aStreamList) {
NS_ASSERT_OWNINGTHREAD(Manager);
MOZ_DIAGNOSTIC_ASSERT(aStreamList);
mStreamLists.AppendElement(aStreamList);
}
void Manager::RemoveStreamList(StreamList* aStreamList) {
NS_ASSERT_OWNINGTHREAD(Manager);
MOZ_DIAGNOSTIC_ASSERT(aStreamList);
mStreamLists.RemoveElement(aStreamList);
}
void Manager::ExecuteCacheOp(Listener* aListener, CacheId aCacheId,
const CacheOpArgs& aOpArgs) {
NS_ASSERT_OWNINGTHREAD(Manager);
MOZ_DIAGNOSTIC_ASSERT(aListener);
MOZ_DIAGNOSTIC_ASSERT(aOpArgs.type() != CacheOpArgs::TCachePutAllArgs);
if (NS_WARN_IF(mState == Closing)) {
aListener->OnOpComplete(ErrorResult(NS_ERROR_FAILURE), void_t());
return;
}
const auto pinnedContext = SafeRefPtr{mContext, AcquireStrongRefFromRawPtr{}};
MOZ_DIAGNOSTIC_ASSERT(!pinnedContext->IsCanceled());
const auto action = [this, aListener, aCacheId, &aOpArgs,
&pinnedContext]() -> RefPtr<Action> {
const ListenerId listenerId = SaveListener(aListener);
if (CacheOpArgs::TCacheDeleteArgs == aOpArgs.type()) {
return new CacheDeleteAction(SafeRefPtrFromThis(), listenerId, aCacheId,
aOpArgs.get_CacheDeleteArgs());
}
auto streamList = MakeSafeRefPtr<StreamList>(SafeRefPtrFromThis(),
pinnedContext.clonePtr());
switch (aOpArgs.type()) {
case CacheOpArgs::TCacheMatchArgs:
return new CacheMatchAction(SafeRefPtrFromThis(), listenerId, aCacheId,
aOpArgs.get_CacheMatchArgs(),
std::move(streamList));
case CacheOpArgs::TCacheMatchAllArgs:
return new CacheMatchAllAction(
SafeRefPtrFromThis(), listenerId, aCacheId,
aOpArgs.get_CacheMatchAllArgs(), std::move(streamList));
case CacheOpArgs::TCacheKeysArgs:
return new CacheKeysAction(SafeRefPtrFromThis(), listenerId, aCacheId,
aOpArgs.get_CacheKeysArgs(),
std::move(streamList));
default:
MOZ_CRASH("Unknown Cache operation!");
}
}();
pinnedContext->Dispatch(action);
}
void Manager::ExecuteStorageOp(Listener* aListener, Namespace aNamespace,
const CacheOpArgs& aOpArgs) {
NS_ASSERT_OWNINGTHREAD(Manager);
MOZ_DIAGNOSTIC_ASSERT(aListener);
if (NS_WARN_IF(mState == Closing)) {
aListener->OnOpComplete(ErrorResult(NS_ERROR_FAILURE), void_t());
return;
}
const auto pinnedContext = SafeRefPtr{mContext, AcquireStrongRefFromRawPtr{}};
MOZ_DIAGNOSTIC_ASSERT(!pinnedContext->IsCanceled());
const auto action = [this, aListener, aNamespace, &aOpArgs,
&pinnedContext]() -> RefPtr<Action> {
const ListenerId listenerId = SaveListener(aListener);
switch (aOpArgs.type()) {
case CacheOpArgs::TStorageMatchArgs:
return new StorageMatchAction(
SafeRefPtrFromThis(), listenerId, aNamespace,
aOpArgs.get_StorageMatchArgs(),
MakeSafeRefPtr<StreamList>(SafeRefPtrFromThis(),
pinnedContext.clonePtr()));
case CacheOpArgs::TStorageHasArgs:
return new StorageHasAction(SafeRefPtrFromThis(), listenerId,
aNamespace, aOpArgs.get_StorageHasArgs());
case CacheOpArgs::TStorageOpenArgs:
return new StorageOpenAction(SafeRefPtrFromThis(), listenerId,
aNamespace, aOpArgs.get_StorageOpenArgs());
case CacheOpArgs::TStorageDeleteArgs:
return new StorageDeleteAction(SafeRefPtrFromThis(), listenerId,
aNamespace,
aOpArgs.get_StorageDeleteArgs());
case CacheOpArgs::TStorageKeysArgs:
return new StorageKeysAction(SafeRefPtrFromThis(), listenerId,
aNamespace);
default:
MOZ_CRASH("Unknown CacheStorage operation!");
}
}();
pinnedContext->Dispatch(action);
}
void Manager::ExecuteOpenStream(Listener* aListener,
InputStreamResolver&& aResolver,
const nsID& aBodyId) {
NS_ASSERT_OWNINGTHREAD(Manager);
MOZ_DIAGNOSTIC_ASSERT(aListener);
MOZ_DIAGNOSTIC_ASSERT(aResolver);
if (NS_WARN_IF(mState == Closing)) {
aResolver(nullptr);
return;
}
const auto pinnedContext = SafeRefPtr{mContext, AcquireStrongRefFromRawPtr{}};
MOZ_DIAGNOSTIC_ASSERT(!pinnedContext->IsCanceled());
// We save the listener simply to track the existence of the caller here.
// Our returned value will really be passed to the resolver when the
// operation completes. In the future we should remove the Listener
// mechanism in favor of std::function or MozPromise.
ListenerId listenerId = SaveListener(aListener);
RefPtr<Action> action = new OpenStreamAction(SafeRefPtrFromThis(), listenerId,
std::move(aResolver), aBodyId);
pinnedContext->Dispatch(action);
}
void Manager::ExecutePutAll(
Listener* aListener, CacheId aCacheId,
const nsTArray<CacheRequestResponse>& aPutList,
const nsTArray<nsCOMPtr<nsIInputStream>>& aRequestStreamList,
const nsTArray<nsCOMPtr<nsIInputStream>>& aResponseStreamList) {
NS_ASSERT_OWNINGTHREAD(Manager);
MOZ_DIAGNOSTIC_ASSERT(aListener);
if (NS_WARN_IF(mState == Closing)) {
aListener->OnOpComplete(ErrorResult(NS_ERROR_FAILURE), CachePutAllResult());
return;
}
const auto pinnedContext = SafeRefPtr{mContext, AcquireStrongRefFromRawPtr{}};
MOZ_DIAGNOSTIC_ASSERT(!pinnedContext->IsCanceled());
ListenerId listenerId = SaveListener(aListener);
RefPtr<Action> action =
new CachePutAllAction(SafeRefPtrFromThis(), listenerId, aCacheId,
aPutList, aRequestStreamList, aResponseStreamList);
pinnedContext->Dispatch(action);
}
Manager::Manager(SafeRefPtr<ManagerId> aManagerId, nsIThread* aIOThread,
const ConstructorGuard&)
: mManagerId(std::move(aManagerId)),
mIOThread(aIOThread),
mContext(nullptr),
mShuttingDown(false),
mState(Open) {
MOZ_DIAGNOSTIC_ASSERT(mManagerId);
MOZ_DIAGNOSTIC_ASSERT(mIOThread);
}
Manager::~Manager() {
NS_ASSERT_OWNINGTHREAD(Manager);
MOZ_DIAGNOSTIC_ASSERT(mState == Closing);
MOZ_DIAGNOSTIC_ASSERT(!mContext);
nsCOMPtr<nsIThread> ioThread;
mIOThread.swap(ioThread);
// Don't spin the event loop in the destructor waiting for the thread to
// shutdown. Defer this to the main thread, instead.
MOZ_ALWAYS_SUCCEEDS(NS_DispatchToMainThread(NewRunnableMethod(
"nsIThread::AsyncShutdown", ioThread, &nsIThread::AsyncShutdown)));
}
void Manager::Init(Maybe<Manager&> aOldManager) {
NS_ASSERT_OWNINGTHREAD(Manager);
// Create the context immediately. Since there can at most be one Context
// per Manager now, this lets us cleanly call Factory::Remove() once the
// Context goes away.
RefPtr<Action> setupAction = new SetupAction();
SafeRefPtr<Context> ref = Context::Create(
SafeRefPtrFromThis(), mIOThread->SerialEventTarget(), setupAction,
aOldManager ? SomeRef(*aOldManager->mContext) : Nothing());
mContext = ref.unsafeGetRawPtr();
}
void Manager::Shutdown() {
NS_ASSERT_OWNINGTHREAD(Manager);
// Ignore duplicate attempts to shutdown. This can occur when we start
// a browser initiated shutdown and then run ~Manager() which also
// calls Shutdown().
if (mShuttingDown) {
return;
}
mShuttingDown = true;
// Note that we are closing to prevent any new requests from coming in and
// creating a new Context. We must ensure all Contexts and IO operations are
// complete before shutdown proceeds.
NoteClosing();
// If there is a context, then cancel and only note that we are done after
// its cleaned up.
if (mContext) {
const auto pinnedContext =
SafeRefPtr{mContext, AcquireStrongRefFromRawPtr{}};
pinnedContext->CancelAll();
return;
}
}
void Manager::Abort() {
NS_ASSERT_OWNINGTHREAD(Manager);
MOZ_DIAGNOSTIC_ASSERT(mContext);
// Note that we are closing to prevent any new requests from coming in and
// creating a new Context. We must ensure all Contexts and IO operations are
// complete before origin clear proceeds.
NoteClosing();
// Cancel and only note that we are done after the context is cleaned up.
const auto pinnedContext = SafeRefPtr{mContext, AcquireStrongRefFromRawPtr{}};
pinnedContext->CancelAll();
}
Manager::ListenerId Manager::SaveListener(Listener* aListener) {
NS_ASSERT_OWNINGTHREAD(Manager);
// Once a Listener is added, we keep a reference to it until its
// removed. Since the same Listener might make multiple requests,
// ensure we only have a single reference in our list.
ListenerList::index_type index =
mListeners.IndexOf(aListener, 0, ListenerEntryListenerComparator());
if (index != ListenerList::NoIndex) {
return mListeners[index].mId;
}
ListenerId id = sNextListenerId;
sNextListenerId += 1;
mListeners.AppendElement(ListenerEntry(id, aListener));
return id;
}
Manager::Listener* Manager::GetListener(ListenerId aListenerId) const {
NS_ASSERT_OWNINGTHREAD(Manager);
ListenerList::index_type index =
mListeners.IndexOf(aListenerId, 0, ListenerEntryIdComparator());
if (index != ListenerList::NoIndex) {
return mListeners[index].mListener;
}
// This can legitimately happen if the actor is deleted while a request is
// in process. For example, the child process OOMs.
return nullptr;
}
bool Manager::SetCacheIdOrphanedIfRefed(CacheId aCacheId) {
NS_ASSERT_OWNINGTHREAD(Manager);
for (uint32_t i = 0; i < mCacheIdRefs.Length(); ++i) {
if (mCacheIdRefs[i].mCacheId == aCacheId) {
MOZ_DIAGNOSTIC_ASSERT(mCacheIdRefs[i].mCount > 0);
MOZ_DIAGNOSTIC_ASSERT(!mCacheIdRefs[i].mOrphaned);
mCacheIdRefs[i].mOrphaned = true;
return true;
}
}
return false;
}
// TODO: provide way to set body non-orphaned if its added back to a cache (bug
// 1110479)
bool Manager::SetBodyIdOrphanedIfRefed(const nsID& aBodyId) {
NS_ASSERT_OWNINGTHREAD(Manager);
for (uint32_t i = 0; i < mBodyIdRefs.Length(); ++i) {
if (mBodyIdRefs[i].mBodyId == aBodyId) {
MOZ_DIAGNOSTIC_ASSERT(mBodyIdRefs[i].mCount > 0);
MOZ_DIAGNOSTIC_ASSERT(!mBodyIdRefs[i].mOrphaned);
mBodyIdRefs[i].mOrphaned = true;
return true;
}
}
return false;
}
void Manager::NoteOrphanedBodyIdList(const nsTArray<nsID>& aDeletedBodyIdList) {
NS_ASSERT_OWNINGTHREAD(Manager);
// XXX TransformIfIntoNewArray might be generalized to allow specifying the
// type of nsTArray to create, so that it can create an AutoTArray as well; an
// TransformIf (without AbortOnErr) might be added, which could be used here.
DeleteOrphanedBodyAction::DeletedBodyIdList deleteNowList;
deleteNowList.SetCapacity(aDeletedBodyIdList.Length());
for (uint32_t i = 0; i < aDeletedBodyIdList.Length(); ++i) {
if (!SetBodyIdOrphanedIfRefed(aDeletedBodyIdList[i])) {
deleteNowList.AppendElement(aDeletedBodyIdList[i]);
}
}
// TODO: note that we need to check these bodies for staleness on startup (bug
// 1110446)
const auto pinnedContext = SafeRefPtr{mContext, AcquireStrongRefFromRawPtr{}};
if (!deleteNowList.IsEmpty() && pinnedContext &&
!pinnedContext->IsCanceled()) {
RefPtr<Action> action =
new DeleteOrphanedBodyAction(std::move(deleteNowList));
pinnedContext->Dispatch(action);
}
}
void Manager::MaybeAllowContextToClose() {
NS_ASSERT_OWNINGTHREAD(Manager);
// If we have an active context, but we have no more users of the Manager,
// then let it shut itself down. We must wait for all possible users of
// Cache state information to complete before doing this. Once we allow
// the Context to close we may not reliably get notified of storage
// invalidation.
const auto pinnedContext = SafeRefPtr{mContext, AcquireStrongRefFromRawPtr{}};
if (pinnedContext && mListeners.IsEmpty() && mCacheIdRefs.IsEmpty() &&
mBodyIdRefs.IsEmpty()) {
// Mark this Manager as invalid so that it won't get used again. We don't
// want to start any new operations once we allow the Context to close since
// it may race with the underlying storage getting invalidated.
NoteClosing();
pinnedContext->AllowToClose();
}
}
} // namespace cache
} // namespace dom
} // namespace mozilla
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