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gecko-dev/netwerk/cache/nsCacheService.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 "nsCacheService.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/Assertions.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/FileUtils.h"
#include "necko-config.h"
#include "nsCache.h"
#include "nsCacheRequest.h"
#include "nsCacheEntry.h"
#include "nsCacheEntryDescriptor.h"
#include "nsCacheDevice.h"
#include "nsICacheVisitor.h"
#include "nsDiskCacheDeviceSQL.h"
#include "nsCacheUtils.h"
#include "../cache2/CacheObserver.h"
#include "nsIObserverService.h"
#include "nsIPrefBranch.h"
#include "nsIFile.h"
#include "nsIOService.h"
#include "nsDirectoryServiceDefs.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsThreadUtils.h"
#include "nsProxyRelease.h"
#include "nsDeleteDir.h"
#include "nsNetCID.h"
#include <math.h> // for log()
#include "mozilla/Services.h"
#include "mozilla/StaticPrefs_browser.h"
#include "mozilla/net/NeckoCommon.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::net;
/******************************************************************************
* nsCacheProfilePrefObserver
*****************************************************************************/
#define OFFLINE_CACHE_DIR_PREF "browser.cache.offline.parent_directory"
#define OFFLINE_CACHE_CAPACITY_PREF "browser.cache.offline.capacity"
#define OFFLINE_CACHE_CAPACITY 512000
#define CACHE_COMPRESSION_LEVEL 1
static const char* observerList[] = {
"profile-before-change", "profile-do-change",
NS_XPCOM_SHUTDOWN_OBSERVER_ID, "last-pb-context-exited",
"suspend_process_notification", "resume_process_notification"};
class nsCacheProfilePrefObserver : public nsIObserver {
virtual ~nsCacheProfilePrefObserver() = default;
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIOBSERVER
nsCacheProfilePrefObserver()
: mHaveProfile(false),
mOfflineCacheEnabled(false),
mOfflineStorageCacheEnabled(false),
mOfflineCacheCapacity(0),
mCacheCompressionLevel(CACHE_COMPRESSION_LEVEL),
mSanitizeOnShutdown(false),
mClearCacheOnShutdown(false) {}
nsresult Install();
void Remove();
nsresult ReadPrefs(nsIPrefBranch* branch);
nsIFile* DiskCacheParentDirectory() { return mDiskCacheParentDirectory; }
bool OfflineCacheEnabled();
int32_t OfflineCacheCapacity() { return mOfflineCacheCapacity; }
nsIFile* OfflineCacheParentDirectory() {
return mOfflineCacheParentDirectory;
}
int32_t CacheCompressionLevel();
bool SanitizeAtShutdown() {
return mSanitizeOnShutdown && mClearCacheOnShutdown;
}
private:
bool mHaveProfile;
nsCOMPtr<nsIFile> mDiskCacheParentDirectory;
bool mOfflineCacheEnabled;
bool mOfflineStorageCacheEnabled;
int32_t mOfflineCacheCapacity; // in kilobytes
nsCOMPtr<nsIFile> mOfflineCacheParentDirectory;
int32_t mCacheCompressionLevel;
bool mSanitizeOnShutdown;
bool mClearCacheOnShutdown;
};
NS_IMPL_ISUPPORTS(nsCacheProfilePrefObserver, nsIObserver)
class nsBlockOnCacheThreadEvent : public Runnable {
public:
nsBlockOnCacheThreadEvent()
: mozilla::Runnable("nsBlockOnCacheThreadEvent") {}
NS_IMETHOD Run() override {
nsCacheServiceAutoLock autoLock(LOCK_TELEM(NSBLOCKONCACHETHREADEVENT_RUN));
CACHE_LOG_DEBUG(("nsBlockOnCacheThreadEvent [%p]\n", this));
nsCacheService::gService->mNotified = true;
nsCacheService::gService->mCondVar.Notify();
return NS_OK;
}
};
nsresult nsCacheProfilePrefObserver::Install() {
// install profile-change observer
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService) return NS_ERROR_FAILURE;
nsresult rv, rv2 = NS_OK;
for (auto& observer : observerList) {
rv = observerService->AddObserver(this, observer, false);
if (NS_FAILED(rv)) rv2 = rv;
}
// install preferences observer
nsCOMPtr<nsIPrefBranch> branch = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!branch) return NS_ERROR_FAILURE;
// Determine if we have a profile already
// Install() is called *after* the profile-after-change notification
// when there is only a single profile, or it is specified on the
// commandline at startup.
// In that case, we detect the presence of a profile by the existence
// of the NS_APP_USER_PROFILE_50_DIR directory.
nsCOMPtr<nsIFile> directory;
rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
getter_AddRefs(directory));
if (NS_SUCCEEDED(rv)) mHaveProfile = true;
rv = ReadPrefs(branch);
NS_ENSURE_SUCCESS(rv, rv);
return rv2;
}
void nsCacheProfilePrefObserver::Remove() {
// remove Observer Service observers
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
for (auto& observer : observerList) {
obs->RemoveObserver(this, observer);
}
}
}
NS_IMETHODIMP
nsCacheProfilePrefObserver::Observe(nsISupports* subject, const char* topic,
const char16_t* data_unicode) {
NS_ConvertUTF16toUTF8 data(data_unicode);
CACHE_LOG_INFO(("Observe [topic=%s data=%s]\n", topic, data.get()));
if (!nsCacheService::IsInitialized()) {
if (!strcmp("resume_process_notification", topic)) {
// A suspended process has a closed cache, so re-open it here.
nsCacheService::GlobalInstance()->Init();
}
return NS_OK;
}
if (!strcmp(NS_XPCOM_SHUTDOWN_OBSERVER_ID, topic)) {
// xpcom going away, shutdown cache service
nsCacheService::GlobalInstance()->Shutdown();
} else if (!strcmp("profile-before-change", topic)) {
// profile before change
mHaveProfile = false;
// XXX shutdown devices
nsCacheService::OnProfileShutdown();
} else if (!strcmp("suspend_process_notification", topic)) {
// A suspended process may never return, so shutdown the cache to reduce
// cache corruption.
nsCacheService::GlobalInstance()->Shutdown();
} else if (!strcmp("profile-do-change", topic)) {
// profile after change
mHaveProfile = true;
nsCOMPtr<nsIPrefBranch> branch = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!branch) {
return NS_ERROR_FAILURE;
}
(void)ReadPrefs(branch);
nsCacheService::OnProfileChanged();
} else if (!strcmp("last-pb-context-exited", topic)) {
nsCacheService::LeavePrivateBrowsing();
}
return NS_OK;
}
nsresult nsCacheProfilePrefObserver::ReadPrefs(nsIPrefBranch* branch) {
nsresult rv = NS_OK;
if (!mDiskCacheParentDirectory) {
nsCOMPtr<nsIFile> directory;
// try to get the disk cache parent directory
rv = NS_GetSpecialDirectory(NS_APP_CACHE_PARENT_DIR,
getter_AddRefs(directory));
if (NS_FAILED(rv)) {
// try to get the profile directory (there may not be a profile yet)
nsCOMPtr<nsIFile> profDir;
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
getter_AddRefs(profDir));
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_LOCAL_50_DIR,
getter_AddRefs(directory));
if (!directory)
directory = profDir;
else if (profDir) {
nsCacheService::MoveOrRemoveDiskCache(profDir, directory, "Cache");
}
}
// use file cache in build tree only if asked, to avoid cache dir litter
if (!directory && PR_GetEnv("NECKO_DEV_ENABLE_DISK_CACHE")) {
rv = NS_GetSpecialDirectory(NS_XPCOM_CURRENT_PROCESS_DIR,
getter_AddRefs(directory));
}
if (directory) {
mDiskCacheParentDirectory = directory;
}
}
// read offline cache device prefs
mOfflineCacheEnabled = StaticPrefs::browser_cache_offline_enable();
mOfflineStorageCacheEnabled =
StaticPrefs::browser_cache_offline_storage_enable();
mOfflineCacheCapacity = OFFLINE_CACHE_CAPACITY;
(void)branch->GetIntPref(OFFLINE_CACHE_CAPACITY_PREF, &mOfflineCacheCapacity);
mOfflineCacheCapacity = std::max(0, mOfflineCacheCapacity);
(void)branch->GetComplexValue(OFFLINE_CACHE_DIR_PREF, // ignore error
NS_GET_IID(nsIFile),
getter_AddRefs(mOfflineCacheParentDirectory));
if (!mOfflineCacheParentDirectory) {
nsCOMPtr<nsIFile> directory;
// try to get the offline cache parent directory
rv = NS_GetSpecialDirectory(NS_APP_CACHE_PARENT_DIR,
getter_AddRefs(directory));
if (NS_FAILED(rv)) {
// try to get the profile directory (there may not be a profile yet)
nsCOMPtr<nsIFile> profDir;
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
getter_AddRefs(profDir));
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_LOCAL_50_DIR,
getter_AddRefs(directory));
if (!directory)
directory = profDir;
else if (profDir) {
nsCacheService::MoveOrRemoveDiskCache(profDir, directory,
"OfflineCache");
}
}
#if DEBUG
if (!directory) {
// use current process directory during development
rv = NS_GetSpecialDirectory(NS_XPCOM_CURRENT_PROCESS_DIR,
getter_AddRefs(directory));
}
#endif
if (directory) {
mOfflineCacheParentDirectory = directory;
}
}
return rv;
}
nsresult nsCacheService::DispatchToCacheIOThread(nsIRunnable* event) {
if (!gService || !gService->mCacheIOThread) return NS_ERROR_NOT_AVAILABLE;
return gService->mCacheIOThread->Dispatch(event, NS_DISPATCH_NORMAL);
}
nsresult nsCacheService::SyncWithCacheIOThread() {
if (!gService || !gService->mCacheIOThread) return NS_ERROR_NOT_AVAILABLE;
gService->mLock.AssertCurrentThreadOwns();
nsCOMPtr<nsIRunnable> event = new nsBlockOnCacheThreadEvent();
// dispatch event - it will notify the monitor when it's done
nsresult rv = gService->mCacheIOThread->Dispatch(event, NS_DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING("Failed dispatching block-event");
return NS_ERROR_UNEXPECTED;
}
// wait until notified, then return
gService->mNotified = false;
while (!gService->mNotified) {
gService->mCondVar.Wait();
}
return NS_OK;
}
bool nsCacheProfilePrefObserver::OfflineCacheEnabled() {
if ((mOfflineCacheCapacity == 0) || (!mOfflineCacheParentDirectory))
return false;
return mOfflineCacheEnabled && mOfflineStorageCacheEnabled;
}
int32_t nsCacheProfilePrefObserver::CacheCompressionLevel() {
return mCacheCompressionLevel;
}
/******************************************************************************
* nsProcessRequestEvent
*****************************************************************************/
class nsProcessRequestEvent : public Runnable {
public:
explicit nsProcessRequestEvent(nsCacheRequest* aRequest)
: mozilla::Runnable("nsProcessRequestEvent") {
mRequest = aRequest;
}
NS_IMETHOD Run() override {
nsresult rv;
NS_ASSERTION(mRequest->mListener,
"Sync OpenCacheEntry() posted to background thread!");
nsCacheServiceAutoLock lock(LOCK_TELEM(NSPROCESSREQUESTEVENT_RUN));
rv = nsCacheService::gService->ProcessRequest(mRequest, false, nullptr);
// Don't delete the request if it was queued
if (!(mRequest->IsBlocking() && rv == NS_ERROR_CACHE_WAIT_FOR_VALIDATION))
delete mRequest;
return NS_OK;
}
protected:
virtual ~nsProcessRequestEvent() = default;
private:
nsCacheRequest* mRequest;
};
/******************************************************************************
* nsDoomEvent
*****************************************************************************/
class nsDoomEvent : public Runnable {
public:
nsDoomEvent(nsCacheSession* session, const nsACString& key,
nsICacheListener* listener)
: mozilla::Runnable("nsDoomEvent") {
mKey = *session->ClientID();
mKey.Append(':');
mKey.Append(key);
mStoragePolicy = session->StoragePolicy();
mListener = listener;
mEventTarget = GetCurrentThreadEventTarget();
// We addref the listener here and release it in nsNotifyDoomListener
// on the callers thread. If posting of nsNotifyDoomListener event fails
// we leak the listener which is better than releasing it on a wrong
// thread.
NS_IF_ADDREF(mListener);
}
NS_IMETHOD Run() override {
nsCacheServiceAutoLock lock;
bool foundActive = true;
nsresult status = NS_ERROR_NOT_AVAILABLE;
nsCacheEntry* entry;
entry = nsCacheService::gService->mActiveEntries.GetEntry(&mKey);
if (!entry) {
bool collision = false;
foundActive = false;
entry = nsCacheService::gService->SearchCacheDevices(
&mKey, mStoragePolicy, &collision);
}
if (entry) {
status = NS_OK;
nsCacheService::gService->DoomEntry_Internal(entry, foundActive);
}
if (mListener) {
mEventTarget->Dispatch(new nsNotifyDoomListener(mListener, status),
NS_DISPATCH_NORMAL);
// posted event will release the reference on the correct thread
mListener = nullptr;
}
return NS_OK;
}
private:
nsCString mKey;
nsCacheStoragePolicy mStoragePolicy;
nsICacheListener* mListener;
nsCOMPtr<nsIEventTarget> mEventTarget;
};
/******************************************************************************
* nsCacheService
*****************************************************************************/
nsCacheService* nsCacheService::gService = nullptr;
NS_IMPL_ISUPPORTS(nsCacheService, nsICacheService, nsICacheServiceInternal)
nsCacheService::nsCacheService()
: mObserver(nullptr),
mLock("nsCacheService.mLock"),
mCondVar(mLock, "nsCacheService.mCondVar"),
mNotified(false),
mTimeStampLock("nsCacheService.mTimeStampLock"),
mInitialized(false),
mClearingEntries(false),
mEnableOfflineDevice(false),
mOfflineDevice(nullptr),
mDoomedEntries{},
mTotalEntries(0),
mCacheHits(0),
mCacheMisses(0),
mMaxKeyLength(0),
mMaxDataSize(0),
mMaxMetaSize(0),
mDeactivateFailures(0),
mDeactivatedUnboundEntries(0) {
NS_ASSERTION(gService == nullptr, "multiple nsCacheService instances!");
gService = this;
// create list of cache devices
PR_INIT_CLIST(&mDoomedEntries);
}
nsCacheService::~nsCacheService() {
if (mInitialized) // Shutdown hasn't been called yet.
(void)Shutdown();
if (mObserver) {
mObserver->Remove();
NS_RELEASE(mObserver);
}
gService = nullptr;
}
nsresult nsCacheService::Init() {
// Thie method must be called on the main thread because mCacheIOThread must
// only be modified on the main thread.
if (!NS_IsMainThread()) {
NS_ERROR("nsCacheService::Init called off the main thread");
return NS_ERROR_NOT_SAME_THREAD;
}
NS_ASSERTION(!mInitialized, "nsCacheService already initialized.");
if (mInitialized) return NS_ERROR_ALREADY_INITIALIZED;
if (mozilla::net::IsNeckoChild()) {
return NS_ERROR_UNEXPECTED;
}
nsresult rv;
mStorageService = do_GetService("@mozilla.org/storage/service;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
rv = NS_NewNamedThread("Cache I/O", getter_AddRefs(mCacheIOThread));
if (NS_FAILED(rv)) {
NS_WARNING("Can't create cache IO thread");
}
rv = nsDeleteDir::Init();
if (NS_FAILED(rv)) {
NS_WARNING("Can't initialize nsDeleteDir");
}
// initialize hashtable for active cache entries
mActiveEntries.Init();
// create profile/preference observer
if (!mObserver) {
mObserver = new nsCacheProfilePrefObserver();
NS_ADDREF(mObserver);
mObserver->Install();
}
mEnableOfflineDevice = mObserver->OfflineCacheEnabled();
mInitialized = true;
return NS_OK;
}
void nsCacheService::Shutdown() {
// This method must be called on the main thread because mCacheIOThread must
// only be modified on the main thread.
if (!NS_IsMainThread()) {
MOZ_CRASH("nsCacheService::Shutdown called off the main thread");
}
nsCOMPtr<nsIThread> cacheIOThread;
Telemetry::AutoTimer<Telemetry::NETWORK_DISK_CACHE_SHUTDOWN> totalTimer;
bool shouldSanitize = false;
nsCOMPtr<nsIFile> parentDir;
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_SHUTDOWN));
NS_ASSERTION(
mInitialized,
"can't shutdown nsCacheService unless it has been initialized.");
if (!mInitialized) return;
mClearingEntries = true;
DoomActiveEntries(nullptr);
}
CloseAllStreams();
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_SHUTDOWN));
NS_ASSERTION(mInitialized, "Bad state");
mInitialized = false;
// Clear entries
ClearDoomList();
// Make sure to wait for any pending cache-operations before
// proceeding with destructive actions (bug #620660)
(void)SyncWithCacheIOThread();
mActiveEntries.Shutdown();
// obtain the disk cache directory in case we need to sanitize it
parentDir = mObserver->DiskCacheParentDirectory();
shouldSanitize = mObserver->SanitizeAtShutdown();
if (mOfflineDevice) mOfflineDevice->Shutdown();
NS_IF_RELEASE(mOfflineDevice);
for (auto iter = mCustomOfflineDevices.Iter(); !iter.Done(); iter.Next()) {
iter.Data()->Shutdown();
iter.Remove();
}
LogCacheStatistics();
mClearingEntries = false;
mCacheIOThread.swap(cacheIOThread);
}
if (cacheIOThread) nsShutdownThread::BlockingShutdown(cacheIOThread);
if (shouldSanitize) {
nsresult rv = parentDir->AppendNative(NS_LITERAL_CSTRING("Cache"));
if (NS_SUCCEEDED(rv)) {
bool exists;
if (NS_SUCCEEDED(parentDir->Exists(&exists)) && exists)
nsDeleteDir::DeleteDir(parentDir, false);
}
Telemetry::AutoTimer<Telemetry::NETWORK_DISK_CACHE_SHUTDOWN_CLEAR_PRIVATE>
timer;
nsDeleteDir::Shutdown(shouldSanitize);
} else {
Telemetry::AutoTimer<Telemetry::NETWORK_DISK_CACHE_DELETEDIR_SHUTDOWN>
timer;
nsDeleteDir::Shutdown(shouldSanitize);
}
}
nsresult nsCacheService::Create(nsISupports* aOuter, const nsIID& aIID,
void** aResult) {
nsresult rv;
if (aOuter != nullptr) return NS_ERROR_NO_AGGREGATION;
RefPtr<nsCacheService> cacheService = new nsCacheService();
rv = cacheService->Init();
if (NS_SUCCEEDED(rv)) {
rv = cacheService->QueryInterface(aIID, aResult);
}
return rv;
}
NS_IMETHODIMP
nsCacheService::CreateSession(const char* clientID,
nsCacheStoragePolicy storagePolicy,
bool streamBased, nsICacheSession** result) {
*result = nullptr;
return NS_ERROR_NOT_IMPLEMENTED;
}
nsresult nsCacheService::CreateSessionInternal(
const char* clientID, nsCacheStoragePolicy storagePolicy, bool streamBased,
nsICacheSession** result) {
RefPtr<nsCacheSession> session =
new nsCacheSession(clientID, storagePolicy, streamBased);
session.forget(result);
return NS_OK;
}
nsresult nsCacheService::EvictEntriesForSession(nsCacheSession* session) {
NS_ASSERTION(gService, "nsCacheService::gService is null.");
return gService->EvictEntriesForClient(session->ClientID()->get(),
session->StoragePolicy());
}
namespace {
class EvictionNotifierRunnable : public Runnable {
public:
explicit EvictionNotifierRunnable(nsISupports* aSubject)
: mozilla::Runnable("EvictionNotifierRunnable"), mSubject(aSubject) {}
NS_DECL_NSIRUNNABLE
private:
nsCOMPtr<nsISupports> mSubject;
};
NS_IMETHODIMP
EvictionNotifierRunnable::Run() {
nsCOMPtr<nsIObserverService> obsSvc = mozilla::services::GetObserverService();
if (obsSvc) {
obsSvc->NotifyObservers(mSubject, NS_CACHESERVICE_EMPTYCACHE_TOPIC_ID,
nullptr);
}
return NS_OK;
}
} // namespace
nsresult nsCacheService::EvictEntriesForClient(
const char* clientID, nsCacheStoragePolicy storagePolicy) {
RefPtr<EvictionNotifierRunnable> r =
new EvictionNotifierRunnable(NS_ISUPPORTS_CAST(nsICacheService*, this));
NS_DispatchToMainThread(r);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_EVICTENTRIESFORCLIENT));
nsresult res = NS_OK;
// Only clear the offline cache if it has been specifically asked for.
if (storagePolicy == nsICache::STORE_OFFLINE) {
if (mEnableOfflineDevice) {
nsresult rv = NS_OK;
if (!mOfflineDevice) rv = CreateOfflineDevice();
if (mOfflineDevice) rv = mOfflineDevice->EvictEntries(clientID);
if (NS_FAILED(rv)) res = rv;
}
}
return res;
}
nsresult nsCacheService::IsStorageEnabledForPolicy(
nsCacheStoragePolicy storagePolicy, bool* result) {
if (gService == nullptr) return NS_ERROR_NOT_AVAILABLE;
nsCacheServiceAutoLock lock(
LOCK_TELEM(NSCACHESERVICE_ISSTORAGEENABLEDFORPOLICY));
*result = nsCacheService::IsStorageEnabledForPolicy_Locked(storagePolicy);
return NS_OK;
}
nsresult nsCacheService::DoomEntry(nsCacheSession* session,
const nsACString& key,
nsICacheListener* listener) {
CACHE_LOG_DEBUG(("Dooming entry for session %p, key %s\n", session,
PromiseFlatCString(key).get()));
if (!gService || !gService->mInitialized) return NS_ERROR_NOT_INITIALIZED;
return DispatchToCacheIOThread(new nsDoomEvent(session, key, listener));
}
bool nsCacheService::IsStorageEnabledForPolicy_Locked(
nsCacheStoragePolicy storagePolicy) {
if (gService->mEnableOfflineDevice &&
storagePolicy == nsICache::STORE_OFFLINE) {
return true;
}
return false;
}
NS_IMETHODIMP nsCacheService::VisitEntries(nsICacheVisitor* visitor) {
return NS_ERROR_NOT_IMPLEMENTED;
}
nsresult nsCacheService::VisitEntriesInternal(nsICacheVisitor* visitor) {
NS_ENSURE_ARG_POINTER(visitor);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_VISITENTRIES));
if (!mEnableOfflineDevice) return NS_ERROR_NOT_AVAILABLE;
// XXX record the fact that a visitation is in progress,
// XXX i.e. keep list of visitors in progress.
nsresult rv = NS_OK;
if (mEnableOfflineDevice) {
if (!mOfflineDevice) {
rv = CreateOfflineDevice();
if (NS_FAILED(rv)) return rv;
}
rv = mOfflineDevice->Visit(visitor);
if (NS_FAILED(rv)) return rv;
}
// XXX notify any shutdown process that visitation is complete for THIS
// visitor.
// XXX keep queue of visitors
return NS_OK;
}
void nsCacheService::FireClearNetworkCacheStoredAnywhereNotification() {
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIObserverService> obsvc = mozilla::services::GetObserverService();
if (obsvc) {
obsvc->NotifyObservers(nullptr, "network-clear-cache-stored-anywhere",
nullptr);
}
}
NS_IMETHODIMP nsCacheService::EvictEntries(nsCacheStoragePolicy storagePolicy) {
return NS_ERROR_NOT_IMPLEMENTED;
}
nsresult nsCacheService::EvictEntriesInternal(
nsCacheStoragePolicy storagePolicy) {
if (storagePolicy == nsICache::STORE_ANYWHERE) {
// if not called on main thread, dispatch the notification to the main
// thread to notify observers
if (!NS_IsMainThread()) {
nsCOMPtr<nsIRunnable> event = NewRunnableMethod(
"nsCacheService::FireClearNetworkCacheStoredAnywhereNotification",
this,
&nsCacheService::FireClearNetworkCacheStoredAnywhereNotification);
NS_DispatchToMainThread(event);
} else {
// else you're already on main thread - notify observers
FireClearNetworkCacheStoredAnywhereNotification();
}
}
return EvictEntriesForClient(nullptr, storagePolicy);
}
NS_IMETHODIMP nsCacheService::GetCacheIOTarget(
nsIEventTarget** aCacheIOTarget) {
NS_ENSURE_ARG_POINTER(aCacheIOTarget);
// Because mCacheIOThread can only be changed on the main thread, it can be
// read from the main thread without the lock. This is useful to prevent
// blocking the main thread on other cache operations.
if (!NS_IsMainThread()) {
Lock(LOCK_TELEM(NSCACHESERVICE_GETCACHEIOTARGET));
}
nsresult rv;
if (mCacheIOThread) {
NS_ADDREF(*aCacheIOTarget = mCacheIOThread);
rv = NS_OK;
} else {
*aCacheIOTarget = nullptr;
rv = NS_ERROR_NOT_AVAILABLE;
}
if (!NS_IsMainThread()) {
Unlock();
}
return rv;
}
NS_IMETHODIMP nsCacheService::GetLockHeldTime(double* aLockHeldTime) {
MutexAutoLock lock(mTimeStampLock);
if (mLockAcquiredTimeStamp.IsNull()) {
*aLockHeldTime = 0.0;
} else {
*aLockHeldTime =
(TimeStamp::Now() - mLockAcquiredTimeStamp).ToMilliseconds();
}
return NS_OK;
}
/**
* Internal Methods
*/
nsresult nsCacheService::GetOfflineDevice(nsOfflineCacheDevice** aDevice) {
if (!mOfflineDevice) {
nsresult rv = CreateOfflineDevice();
NS_ENSURE_SUCCESS(rv, rv);
}
NS_ADDREF(*aDevice = mOfflineDevice);
return NS_OK;
}
nsresult nsCacheService::GetCustomOfflineDevice(
nsIFile* aProfileDir, int32_t aQuota, nsOfflineCacheDevice** aDevice) {
nsresult rv;
nsAutoString profilePath;
rv = aProfileDir->GetPath(profilePath);
NS_ENSURE_SUCCESS(rv, rv);
if (!mCustomOfflineDevices.Get(profilePath, aDevice)) {
rv = CreateCustomOfflineDevice(aProfileDir, aQuota, aDevice);
NS_ENSURE_SUCCESS(rv, rv);
(*aDevice)->SetAutoShutdown();
mCustomOfflineDevices.Put(profilePath, RefPtr{*aDevice});
}
return NS_OK;
}
nsresult nsCacheService::CreateOfflineDevice() {
CACHE_LOG_INFO(("Creating default offline device"));
if (mOfflineDevice) return NS_OK;
if (!nsCacheService::IsInitialized()) {
return NS_ERROR_NOT_AVAILABLE;
}
nsresult rv = CreateCustomOfflineDevice(
mObserver->OfflineCacheParentDirectory(),
mObserver->OfflineCacheCapacity(), &mOfflineDevice);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult nsCacheService::CreateCustomOfflineDevice(
nsIFile* aProfileDir, int32_t aQuota, nsOfflineCacheDevice** aDevice) {
NS_ENSURE_ARG(aProfileDir);
if (MOZ_LOG_TEST(gCacheLog, LogLevel::Info)) {
CACHE_LOG_INFO(("Creating custom offline device, %s, %d",
aProfileDir->HumanReadablePath().get(), aQuota));
}
if (!mInitialized) return NS_ERROR_NOT_AVAILABLE;
if (!mEnableOfflineDevice) return NS_ERROR_NOT_AVAILABLE;
RefPtr<nsOfflineCacheDevice> device = new nsOfflineCacheDevice();
// set the preferences
device->SetCacheParentDirectory(aProfileDir);
device->SetCapacity(aQuota);
nsresult rv = device->InitWithSqlite(mStorageService);
if (NS_FAILED(rv)) {
CACHE_LOG_DEBUG(("OfflineDevice->InitWithSqlite() failed (0x%.8" PRIx32
")\n",
static_cast<uint32_t>(rv)));
CACHE_LOG_DEBUG((" - disabling offline cache for this session.\n"));
device = nullptr;
}
device.forget(aDevice);
return rv;
}
nsresult nsCacheService::RemoveCustomOfflineDevice(
nsOfflineCacheDevice* aDevice) {
nsCOMPtr<nsIFile> profileDir = aDevice->BaseDirectory();
if (!profileDir) return NS_ERROR_UNEXPECTED;
nsAutoString profilePath;
nsresult rv = profileDir->GetPath(profilePath);
NS_ENSURE_SUCCESS(rv, rv);
mCustomOfflineDevices.Remove(profilePath);
return NS_OK;
}
nsresult nsCacheService::CreateRequest(nsCacheSession* session,
const nsACString& clientKey,
nsCacheAccessMode accessRequested,
bool blockingMode,
nsICacheListener* listener,
nsCacheRequest** request) {
NS_ASSERTION(request, "CreateRequest: request is null");
nsAutoCString key(*session->ClientID());
key.Append(':');
key.Append(clientKey);
if (mMaxKeyLength < key.Length()) mMaxKeyLength = key.Length();
// create request
*request =
new nsCacheRequest(key, listener, accessRequested, blockingMode, session);
if (!listener) return NS_OK; // we're sync, we're done.
// get the request's thread
(*request)->mEventTarget = GetCurrentThreadEventTarget();
return NS_OK;
}
class nsCacheListenerEvent : public Runnable {
public:
nsCacheListenerEvent(nsICacheListener* listener,
nsICacheEntryDescriptor* descriptor,
nsCacheAccessMode accessGranted, nsresult status)
: mozilla::Runnable("nsCacheListenerEvent"),
mListener(listener) // transfers reference
,
mDescriptor(descriptor) // transfers reference (may be null)
,
mAccessGranted(accessGranted),
mStatus(status) {}
NS_IMETHOD Run() override {
mListener->OnCacheEntryAvailable(mDescriptor, mAccessGranted, mStatus);
NS_RELEASE(mListener);
NS_IF_RELEASE(mDescriptor);
return NS_OK;
}
private:
// We explicitly leak mListener or mDescriptor if Run is not called
// because otherwise we cannot guarantee that they are destroyed on
// the right thread.
nsICacheListener* mListener;
nsICacheEntryDescriptor* mDescriptor;
nsCacheAccessMode mAccessGranted;
nsresult mStatus;
};
nsresult nsCacheService::NotifyListener(nsCacheRequest* request,
nsICacheEntryDescriptor* descriptor,
nsCacheAccessMode accessGranted,
nsresult status) {
NS_ASSERTION(request->mEventTarget, "no thread set in async request!");
// Swap ownership, and release listener on target thread...
nsICacheListener* listener = request->mListener;
request->mListener = nullptr;
nsCOMPtr<nsIRunnable> ev =
new nsCacheListenerEvent(listener, descriptor, accessGranted, status);
if (!ev) {
// Better to leak listener and descriptor if we fail because we don't
// want to destroy them inside the cache service lock or on potentially
// the wrong thread.
return NS_ERROR_OUT_OF_MEMORY;
}
return request->mEventTarget->Dispatch(ev, NS_DISPATCH_NORMAL);
}
nsresult nsCacheService::ProcessRequest(nsCacheRequest* request,
bool calledFromOpenCacheEntry,
nsICacheEntryDescriptor** result) {
// !!! must be called with mLock held !!!
nsresult rv;
nsCacheEntry* entry = nullptr;
nsCacheEntry* doomedEntry = nullptr;
nsCacheAccessMode accessGranted = nsICache::ACCESS_NONE;
if (result) *result = nullptr;
while (true) { // Activate entry loop
rv = ActivateEntry(request, &entry,
&doomedEntry); // get the entry for this request
if (NS_FAILED(rv)) break;
while (true) { // Request Access loop
NS_ASSERTION(entry, "no entry in Request Access loop!");
// entry->RequestAccess queues request on entry
rv = entry->RequestAccess(request, &accessGranted);
if (rv != NS_ERROR_CACHE_WAIT_FOR_VALIDATION) break;
if (request->IsBlocking()) {
if (request->mListener) {
// async exits - validate, doom, or close will resume
return rv;
}
// XXX this is probably wrong...
Unlock();
rv = request->WaitForValidation();
Lock(LOCK_TELEM(NSCACHESERVICE_PROCESSREQUEST));
}
PR_REMOVE_AND_INIT_LINK(request);
if (NS_FAILED(rv))
break; // non-blocking mode returns WAIT_FOR_VALIDATION error
// okay, we're ready to process this request, request access again
}
if (rv != NS_ERROR_CACHE_ENTRY_DOOMED) break;
if (entry->IsNotInUse()) {
// this request was the last one keeping it around, so get rid of it
DeactivateEntry(entry);
}
// loop back around to look for another entry
}
if (NS_SUCCEEDED(rv) && request->mProfileDir) {
// Custom cache directory has been demanded. Preset the cache device.
if (entry->StoragePolicy() != nsICache::STORE_OFFLINE) {
// Failsafe check: this is implemented only for offline cache atm.
rv = NS_ERROR_FAILURE;
} else {
RefPtr<nsOfflineCacheDevice> customCacheDevice;
rv = GetCustomOfflineDevice(request->mProfileDir, -1,
getter_AddRefs(customCacheDevice));
if (NS_SUCCEEDED(rv)) entry->SetCustomCacheDevice(customCacheDevice);
}
}
nsICacheEntryDescriptor* descriptor = nullptr;
if (NS_SUCCEEDED(rv))
rv = entry->CreateDescriptor(request, accessGranted, &descriptor);
// If doomedEntry is set, ActivatEntry() doomed an existing entry and
// created a new one for that cache-key. However, any pending requests
// on the doomed entry were not processed and we need to do that here.
// This must be done after adding the created entry to list of active
// entries (which is done in ActivateEntry()) otherwise the hashkeys crash
// (see bug ##561313). It is also important to do this after creating a
// descriptor for this request, or some other request may end up being
// executed first for the newly created entry.
// Finally, it is worth to emphasize that if doomedEntry is set,
// ActivateEntry() created a new entry for the request, which will be
// initialized by RequestAccess() and they both should have returned NS_OK.
if (doomedEntry) {
(void)ProcessPendingRequests(doomedEntry);
if (doomedEntry->IsNotInUse()) DeactivateEntry(doomedEntry);
doomedEntry = nullptr;
}
if (request->mListener) { // Asynchronous
if (NS_FAILED(rv) && calledFromOpenCacheEntry && request->IsBlocking())
return rv; // skip notifying listener, just return rv to caller
// call listener to report error or descriptor
nsresult rv2 = NotifyListener(request, descriptor, accessGranted, rv);
if (NS_FAILED(rv2) && NS_SUCCEEDED(rv)) {
rv = rv2; // trigger delete request
}
} else { // Synchronous
*result = descriptor;
}
return rv;
}
nsresult nsCacheService::OpenCacheEntry(nsCacheSession* session,
const nsACString& key,
nsCacheAccessMode accessRequested,
bool blockingMode,
nsICacheListener* listener,
nsICacheEntryDescriptor** result) {
CACHE_LOG_DEBUG(
("Opening entry for session %p, key %s, mode %d, blocking %d\n", session,
PromiseFlatCString(key).get(), accessRequested, blockingMode));
if (result) *result = nullptr;
if (!gService || !gService->mInitialized) return NS_ERROR_NOT_INITIALIZED;
nsCacheRequest* request = nullptr;
nsresult rv = gService->CreateRequest(session, key, accessRequested,
blockingMode, listener, &request);
if (NS_FAILED(rv)) return rv;
CACHE_LOG_DEBUG(("Created request %p\n", request));
// Process the request on the background thread if we are on the main thread
// and the the request is asynchronous
if (NS_IsMainThread() && listener && gService->mCacheIOThread) {
nsCOMPtr<nsIRunnable> ev = new nsProcessRequestEvent(request);
rv = DispatchToCacheIOThread(ev);
// delete request if we didn't post the event
if (NS_FAILED(rv)) delete request;
} else {
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_OPENCACHEENTRY));
rv = gService->ProcessRequest(request, true, result);
// delete requests that have completed
if (!(listener && blockingMode &&
(rv == NS_ERROR_CACHE_WAIT_FOR_VALIDATION)))
delete request;
}
return rv;
}
nsresult nsCacheService::ActivateEntry(nsCacheRequest* request,
nsCacheEntry** result,
nsCacheEntry** doomedEntry) {
CACHE_LOG_DEBUG(("Activate entry for request %p\n", request));
if (!mInitialized || mClearingEntries) return NS_ERROR_NOT_AVAILABLE;
nsresult rv = NS_OK;
NS_ASSERTION(request != nullptr, "ActivateEntry called with no request");
if (result) *result = nullptr;
if (doomedEntry) *doomedEntry = nullptr;
if ((!request) || (!result) || (!doomedEntry)) return NS_ERROR_NULL_POINTER;
// check if the request can be satisfied
if (!request->IsStreamBased()) return NS_ERROR_FAILURE;
if (!IsStorageEnabledForPolicy_Locked(request->StoragePolicy()))
return NS_ERROR_FAILURE;
// search active entries (including those not bound to device)
nsCacheEntry* entry = mActiveEntries.GetEntry(&(request->mKey));
CACHE_LOG_DEBUG(("Active entry for request %p is %p\n", request, entry));
if (!entry) {
// search cache devices for entry
bool collision = false;
entry = SearchCacheDevices(&(request->mKey), request->StoragePolicy(),
&collision);
CACHE_LOG_DEBUG(
("Device search for request %p returned %p\n", request, entry));
// When there is a hashkey collision just refuse to cache it...
if (collision) return NS_ERROR_CACHE_IN_USE;
if (entry) entry->MarkInitialized();
} else {
NS_ASSERTION(entry->IsActive(), "Inactive entry found in mActiveEntries!");
}
if (entry) {
++mCacheHits;
entry->Fetched();
} else {
++mCacheMisses;
}
if (entry && ((request->AccessRequested() == nsICache::ACCESS_WRITE) ||
((request->StoragePolicy() != nsICache::STORE_OFFLINE) &&
(entry->mExpirationTime <= SecondsFromPRTime(PR_Now()) &&
request->WillDoomEntriesIfExpired()))))
{
// this is FORCE-WRITE request or the entry has expired
// we doom entry without processing pending requests, but store it in
// doomedEntry which causes pending requests to be processed below
rv = DoomEntry_Internal(entry, false);
*doomedEntry = entry;
if (NS_FAILED(rv)) {
// XXX what to do? Increment FailedDooms counter?
}
entry = nullptr;
}
if (!entry) {
if (!(request->AccessRequested() & nsICache::ACCESS_WRITE)) {
// this is a READ-ONLY request
rv = NS_ERROR_CACHE_KEY_NOT_FOUND;
goto error;
}
entry = new nsCacheEntry(request->mKey, request->IsStreamBased(),
request->StoragePolicy());
if (!entry) return NS_ERROR_OUT_OF_MEMORY;
if (request->IsPrivate()) entry->MarkPrivate();
entry->Fetched();
++mTotalEntries;
// XXX we could perform an early bind in some cases based on storage policy
}
if (!entry->IsActive()) {
rv = mActiveEntries.AddEntry(entry);
if (NS_FAILED(rv)) goto error;
CACHE_LOG_DEBUG(("Added entry %p to mActiveEntries\n", entry));
entry->MarkActive(); // mark entry active, because it's now in
// mActiveEntries
}
*result = entry;
return NS_OK;
error:
*result = nullptr;
delete entry;
return rv;
}
nsCacheEntry* nsCacheService::SearchCacheDevices(nsCString* key,
nsCacheStoragePolicy policy,
bool* collision) {
Telemetry::AutoTimer<Telemetry::CACHE_DEVICE_SEARCH_2> timer;
nsCacheEntry* entry = nullptr;
*collision = false;
if (policy == nsICache::STORE_OFFLINE ||
(policy == nsICache::STORE_ANYWHERE && gIOService->IsOffline())) {
if (mEnableOfflineDevice) {
if (!mOfflineDevice) {
nsresult rv = CreateOfflineDevice();
if (NS_FAILED(rv)) return nullptr;
}
entry = mOfflineDevice->FindEntry(key, collision);
}
}
return entry;
}
nsCacheDevice* nsCacheService::EnsureEntryHasDevice(nsCacheEntry* entry) {
nsCacheDevice* device = entry->CacheDevice();
// return device if found, possibly null if the entry is doomed i.e prevent
// doomed entries to bind to a device (see e.g. bugs #548406 and #596443)
if (device || entry->IsDoomed()) return device;
if (!device && entry->IsStreamData() && entry->IsAllowedOffline() &&
mEnableOfflineDevice) {
if (!mOfflineDevice) {
(void)CreateOfflineDevice(); // ignore the error (check for
// mOfflineDevice instead)
}
device = entry->CustomCacheDevice() ? entry->CustomCacheDevice()
: mOfflineDevice;
if (device) {
entry->MarkBinding();
nsresult rv = device->BindEntry(entry);
entry->ClearBinding();
if (NS_FAILED(rv)) device = nullptr;
}
}
if (device) entry->SetCacheDevice(device);
return device;
}
nsresult nsCacheService::DoomEntry(nsCacheEntry* entry) {
return gService->DoomEntry_Internal(entry, true);
}
nsresult nsCacheService::DoomEntry_Internal(nsCacheEntry* entry,
bool doProcessPendingRequests) {
if (entry->IsDoomed()) return NS_OK;
CACHE_LOG_DEBUG(("Dooming entry %p\n", entry));
nsresult rv = NS_OK;
entry->MarkDoomed();
NS_ASSERTION(!entry->IsBinding(), "Dooming entry while binding device.");
nsCacheDevice* device = entry->CacheDevice();
if (device) device->DoomEntry(entry);
if (entry->IsActive()) {
// remove from active entries
mActiveEntries.RemoveEntry(entry);
CACHE_LOG_DEBUG(("Removed entry %p from mActiveEntries\n", entry));
entry->MarkInactive();
}
// put on doom list to wait for descriptors to close
NS_ASSERTION(PR_CLIST_IS_EMPTY(entry), "doomed entry still on device list");
PR_APPEND_LINK(entry, &mDoomedEntries);
// handle pending requests only if we're supposed to
if (doProcessPendingRequests) {
// tell pending requests to get on with their lives...
rv = ProcessPendingRequests(entry);
// All requests have been removed, but there may still be open descriptors
if (entry->IsNotInUse()) {
DeactivateEntry(entry); // tell device to get rid of it
}
}
return rv;
}
void nsCacheService::OnProfileShutdown() {
if (!gService || !gService->mInitialized) {
// The cache service has been shut down, but someone is still holding
// a reference to it. Ignore this call.
return;
}
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_ONPROFILESHUTDOWN));
gService->mClearingEntries = true;
gService->DoomActiveEntries(nullptr);
}
gService->CloseAllStreams();
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_ONPROFILESHUTDOWN));
gService->ClearDoomList();
// Make sure to wait for any pending cache-operations before
// proceeding with destructive actions (bug #620660)
(void)SyncWithCacheIOThread();
if (gService->mOfflineDevice && gService->mEnableOfflineDevice) {
gService->mOfflineDevice->Shutdown();
}
for (auto iter = gService->mCustomOfflineDevices.Iter(); !iter.Done();
iter.Next()) {
iter.Data()->Shutdown();
iter.Remove();
}
gService->mEnableOfflineDevice = false;
gService->mClearingEntries = false;
}
void nsCacheService::OnProfileChanged() {
if (!gService) return;
CACHE_LOG_DEBUG(("nsCacheService::OnProfileChanged"));
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_ONPROFILECHANGED));
gService->mEnableOfflineDevice = gService->mObserver->OfflineCacheEnabled();
if (gService->mOfflineDevice) {
gService->mOfflineDevice->SetCacheParentDirectory(
gService->mObserver->OfflineCacheParentDirectory());
gService->mOfflineDevice->SetCapacity(
gService->mObserver->OfflineCacheCapacity());
// XXX initialization of mOfflineDevice could be made lazily, if
// mEnableOfflineDevice is false
nsresult rv =
gService->mOfflineDevice->InitWithSqlite(gService->mStorageService);
if (NS_FAILED(rv)) {
NS_ERROR(
"nsCacheService::OnProfileChanged: Re-initializing offline device "
"failed");
gService->mEnableOfflineDevice = false;
// XXX delete mOfflineDevice?
}
}
}
void nsCacheService::SetOfflineCacheEnabled(bool enabled) {
if (!gService) return;
nsCacheServiceAutoLock lock(
LOCK_TELEM(NSCACHESERVICE_SETOFFLINECACHEENABLED));
gService->mEnableOfflineDevice = enabled;
}
void nsCacheService::SetOfflineCacheCapacity(int32_t capacity) {
if (!gService) return;
nsCacheServiceAutoLock lock(
LOCK_TELEM(NSCACHESERVICE_SETOFFLINECACHECAPACITY));
if (gService->mOfflineDevice) {
gService->mOfflineDevice->SetCapacity(capacity);
}
gService->mEnableOfflineDevice = gService->mObserver->OfflineCacheEnabled();
}
/******************************************************************************
* static methods for nsCacheEntryDescriptor
*****************************************************************************/
void nsCacheService::CloseDescriptor(nsCacheEntryDescriptor* descriptor) {
// ask entry to remove descriptor
nsCacheEntry* entry = descriptor->CacheEntry();
bool doomEntry;
bool stillActive = entry->RemoveDescriptor(descriptor, &doomEntry);
if (!entry->IsValid()) {
gService->ProcessPendingRequests(entry);
}
if (doomEntry) {
gService->DoomEntry_Internal(entry, true);
return;
}
if (!stillActive) {
gService->DeactivateEntry(entry);
}
}
nsresult nsCacheService::GetFileForEntry(nsCacheEntry* entry,
nsIFile** result) {
nsCacheDevice* device = gService->EnsureEntryHasDevice(entry);
if (!device) return NS_ERROR_UNEXPECTED;
return device->GetFileForEntry(entry, result);
}
nsresult nsCacheService::OpenInputStreamForEntry(nsCacheEntry* entry,
nsCacheAccessMode mode,
uint32_t offset,
nsIInputStream** result) {
nsCacheDevice* device = gService->EnsureEntryHasDevice(entry);
if (!device) return NS_ERROR_UNEXPECTED;
return device->OpenInputStreamForEntry(entry, mode, offset, result);
}
nsresult nsCacheService::OpenOutputStreamForEntry(nsCacheEntry* entry,
nsCacheAccessMode mode,
uint32_t offset,
nsIOutputStream** result) {
nsCacheDevice* device = gService->EnsureEntryHasDevice(entry);
if (!device) return NS_ERROR_UNEXPECTED;
return device->OpenOutputStreamForEntry(entry, mode, offset, result);
}
nsresult nsCacheService::OnDataSizeChange(nsCacheEntry* entry,
int32_t deltaSize) {
nsCacheDevice* device = gService->EnsureEntryHasDevice(entry);
if (!device) return NS_ERROR_UNEXPECTED;
return device->OnDataSizeChange(entry, deltaSize);
}
void nsCacheService::LockAcquired() {
MutexAutoLock lock(mTimeStampLock);
mLockAcquiredTimeStamp = TimeStamp::Now();
}
void nsCacheService::LockReleased() {
MutexAutoLock lock(mTimeStampLock);
mLockAcquiredTimeStamp = TimeStamp();
}
void nsCacheService::Lock() {
gService->mLock.Lock();
gService->LockAcquired();
}
void nsCacheService::Lock(mozilla::Telemetry::HistogramID mainThreadLockerID) {
mozilla::Telemetry::HistogramID lockerID;
mozilla::Telemetry::HistogramID generalID;
if (NS_IsMainThread()) {
lockerID = mainThreadLockerID;
generalID = mozilla::Telemetry::CACHE_SERVICE_LOCK_WAIT_MAINTHREAD_2;
} else {
lockerID = mozilla::Telemetry::HistogramCount;
generalID = mozilla::Telemetry::CACHE_SERVICE_LOCK_WAIT_2;
}
TimeStamp start(TimeStamp::Now());
nsCacheService::Lock();
TimeStamp stop(TimeStamp::Now());
// Telemetry isn't thread safe on its own, but this is OK because we're
// protecting it with the cache lock.
if (lockerID != mozilla::Telemetry::HistogramCount) {
mozilla::Telemetry::AccumulateTimeDelta(lockerID, start, stop);
}
mozilla::Telemetry::AccumulateTimeDelta(generalID, start, stop);
}
void nsCacheService::Unlock() {
gService->mLock.AssertCurrentThreadOwns();
nsTArray<nsISupports*> doomed;
doomed.SwapElements(gService->mDoomedObjects);
gService->LockReleased();
gService->mLock.Unlock();
for (uint32_t i = 0; i < doomed.Length(); ++i) doomed[i]->Release();
}
void nsCacheService::ReleaseObject_Locked(nsISupports* obj,
nsIEventTarget* target) {
gService->mLock.AssertCurrentThreadOwns();
bool isCur;
if (!target || (NS_SUCCEEDED(target->IsOnCurrentThread(&isCur)) && isCur)) {
gService->mDoomedObjects.AppendElement(obj);
} else {
NS_ProxyRelease("nsCacheService::ReleaseObject_Locked::obj", target,
dont_AddRef(obj));
}
}
nsresult nsCacheService::SetCacheElement(nsCacheEntry* entry,
nsISupports* element) {
entry->SetData(element);
entry->TouchData();
return NS_OK;
}
nsresult nsCacheService::ValidateEntry(nsCacheEntry* entry) {
nsCacheDevice* device = gService->EnsureEntryHasDevice(entry);
if (!device) return NS_ERROR_UNEXPECTED;
entry->MarkValid();
nsresult rv = gService->ProcessPendingRequests(entry);
NS_ASSERTION(rv == NS_OK, "ProcessPendingRequests failed.");
// XXX what else should be done?
return rv;
}
int32_t nsCacheService::CacheCompressionLevel() {
int32_t level = gService->mObserver->CacheCompressionLevel();
return level;
}
void nsCacheService::DeactivateEntry(nsCacheEntry* entry) {
CACHE_LOG_DEBUG(("Deactivating entry %p\n", entry));
nsresult rv = NS_OK;
NS_ASSERTION(entry->IsNotInUse(), "### deactivating an entry while in use!");
nsCacheDevice* device = nullptr;
if (mMaxDataSize < entry->DataSize()) mMaxDataSize = entry->DataSize();
if (mMaxMetaSize < entry->MetaDataSize())
mMaxMetaSize = entry->MetaDataSize();
if (entry->IsDoomed()) {
// remove from Doomed list
PR_REMOVE_AND_INIT_LINK(entry);
} else if (entry->IsActive()) {
// remove from active entries
mActiveEntries.RemoveEntry(entry);
CACHE_LOG_DEBUG(
("Removed deactivated entry %p from mActiveEntries\n", entry));
entry->MarkInactive();
// bind entry if necessary to store meta-data
device = EnsureEntryHasDevice(entry);
if (!device) {
CACHE_LOG_DEBUG(
("DeactivateEntry: unable to bind active "
"entry %p\n",
entry));
NS_WARNING("DeactivateEntry: unable to bind active entry\n");
return;
}
} else {
// if mInitialized == false,
// then we're shutting down and this state is okay.
NS_ASSERTION(!mInitialized, "DeactivateEntry: bad cache entry state.");
}
device = entry->CacheDevice();
if (device) {
rv = device->DeactivateEntry(entry);
if (NS_FAILED(rv)) {
// increment deactivate failure count
++mDeactivateFailures;
}
} else {
// increment deactivating unbound entry statistic
++mDeactivatedUnboundEntries;
delete entry; // because no one else will
}
}
nsresult nsCacheService::ProcessPendingRequests(nsCacheEntry* entry) {
nsresult rv = NS_OK;
nsCacheRequest* request = (nsCacheRequest*)PR_LIST_HEAD(&entry->mRequestQ);
nsCacheRequest* nextRequest;
bool newWriter = false;
CACHE_LOG_DEBUG((
"ProcessPendingRequests for %sinitialized %s %salid entry %p\n",
(entry->IsInitialized() ? "" : "Un"), (entry->IsDoomed() ? "DOOMED" : ""),
(entry->IsValid() ? "V" : "Inv"), entry));
if (request == &entry->mRequestQ) return NS_OK; // no queued requests
if (!entry->IsDoomed() && entry->IsInvalid()) {
// 1st descriptor closed w/o MarkValid()
NS_ASSERTION(PR_CLIST_IS_EMPTY(&entry->mDescriptorQ),
"shouldn't be here with open descriptors");
#if DEBUG
// verify no ACCESS_WRITE requests(shouldn't have any of these)
while (request != &entry->mRequestQ) {
NS_ASSERTION(request->AccessRequested() != nsICache::ACCESS_WRITE,
"ACCESS_WRITE request should have been given a new entry");
request = (nsCacheRequest*)PR_NEXT_LINK(request);
}
request = (nsCacheRequest*)PR_LIST_HEAD(&entry->mRequestQ);
#endif
// find first request with ACCESS_READ_WRITE (if any) and promote it to 1st
// writer
while (request != &entry->mRequestQ) {
if (request->AccessRequested() == nsICache::ACCESS_READ_WRITE) {
newWriter = true;
CACHE_LOG_DEBUG((" promoting request %p to 1st writer\n", request));
break;
}
request = (nsCacheRequest*)PR_NEXT_LINK(request);
}
if (request == &entry->mRequestQ) // no requests asked for
// ACCESS_READ_WRITE, back to top
request = (nsCacheRequest*)PR_LIST_HEAD(&entry->mRequestQ);
// XXX what should we do if there are only READ requests in queue?
// XXX serialize their accesses, give them only read access, but force them
// to check validate flag?
// XXX or do readers simply presume the entry is valid
// See fix for bug #467392 below
}
nsCacheAccessMode accessGranted = nsICache::ACCESS_NONE;
while (request != &entry->mRequestQ) {
nextRequest = (nsCacheRequest*)PR_NEXT_LINK(request);
CACHE_LOG_DEBUG((" %sync request %p for %p\n",
(request->mListener ? "As" : "S"), request, entry));
if (request->mListener) {
// Async request
PR_REMOVE_AND_INIT_LINK(request);
if (entry->IsDoomed()) {
rv = ProcessRequest(request, false, nullptr);
if (rv == NS_ERROR_CACHE_WAIT_FOR_VALIDATION)
rv = NS_OK;
else
delete request;
if (NS_FAILED(rv)) {
// XXX what to do?
}
} else if (entry->IsValid() || newWriter) {
rv = entry->RequestAccess(request, &accessGranted);
NS_ASSERTION(NS_SUCCEEDED(rv),
"if entry is valid, RequestAccess must succeed.");
// XXX if (newWriter) {
// NS_ASSERTION( accessGranted ==
// request->AccessRequested(), "why not?");
// }
// entry->CreateDescriptor dequeues request, and queues descriptor
nsICacheEntryDescriptor* descriptor = nullptr;
rv = entry->CreateDescriptor(request, accessGranted, &descriptor);
// post call to listener to report error or descriptor
rv = NotifyListener(request, descriptor, accessGranted, rv);
delete request;
if (NS_FAILED(rv)) {
// XXX what to do?
}
} else {
// read-only request to an invalid entry - need to wait for
// the entry to become valid so we post an event to process
// the request again later (bug #467392)
nsCOMPtr<nsIRunnable> ev = new nsProcessRequestEvent(request);
rv = DispatchToCacheIOThread(ev);
if (NS_FAILED(rv)) {
delete request; // avoid leak
}
}
} else {
// Synchronous request
request->WakeUp();
}
if (newWriter) break; // process remaining requests after validation
request = nextRequest;
}
return NS_OK;
}
bool nsCacheService::IsDoomListEmpty() {
nsCacheEntry* entry = (nsCacheEntry*)PR_LIST_HEAD(&mDoomedEntries);
return &mDoomedEntries == entry;
}
void nsCacheService::ClearDoomList() {
nsCacheEntry* entry = (nsCacheEntry*)PR_LIST_HEAD(&mDoomedEntries);
while (entry != &mDoomedEntries) {
nsCacheEntry* next = (nsCacheEntry*)PR_NEXT_LINK(entry);
entry->DetachDescriptors();
DeactivateEntry(entry);
entry = next;
}
}
void nsCacheService::DoomActiveEntries(DoomCheckFn check) {
AutoTArray<nsCacheEntry*, 8> array;
for (auto iter = mActiveEntries.Iter(); !iter.Done(); iter.Next()) {
nsCacheEntry* entry =
static_cast<nsCacheEntryHashTableEntry*>(iter.Get())->cacheEntry;
if (check && !check(entry)) {
continue;
}
array.AppendElement(entry);
// entry is being removed from the active entry list
entry->MarkInactive();
iter.Remove();
}
uint32_t count = array.Length();
for (uint32_t i = 0; i < count; ++i) {
DoomEntry_Internal(array[i], true);
}
}
void nsCacheService::CloseAllStreams() {
nsTArray<RefPtr<nsCacheEntryDescriptor::nsInputStreamWrapper> > inputs;
nsTArray<RefPtr<nsCacheEntryDescriptor::nsOutputStreamWrapper> > outputs;
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_CLOSEALLSTREAMS));
nsTArray<nsCacheEntry*> entries;
#if DEBUG
// make sure there is no active entry
for (auto iter = mActiveEntries.Iter(); !iter.Done(); iter.Next()) {
auto entry = static_cast<nsCacheEntryHashTableEntry*>(iter.Get());
entries.AppendElement(entry->cacheEntry);
}
NS_ASSERTION(entries.IsEmpty(), "Bad state");
#endif
// Get doomed entries
nsCacheEntry* entry = (nsCacheEntry*)PR_LIST_HEAD(&mDoomedEntries);
while (entry != &mDoomedEntries) {
nsCacheEntry* next = (nsCacheEntry*)PR_NEXT_LINK(entry);
entries.AppendElement(entry);
entry = next;
}
// Iterate through all entries and collect input and output streams
for (size_t i = 0; i < entries.Length(); i++) {
entry = entries.ElementAt(i);
nsTArray<RefPtr<nsCacheEntryDescriptor> > descs;
entry->GetDescriptors(descs);
for (uint32_t j = 0; j < descs.Length(); j++) {
if (descs[j]->mOutputWrapper)
outputs.AppendElement(descs[j]->mOutputWrapper);
for (size_t k = 0; k < descs[j]->mInputWrappers.Length(); k++)
inputs.AppendElement(descs[j]->mInputWrappers[k]);
}
}
}
uint32_t i;
for (i = 0; i < inputs.Length(); i++) inputs[i]->Close();
for (i = 0; i < outputs.Length(); i++) outputs[i]->Close();
}
bool nsCacheService::GetClearingEntries() {
AssertOwnsLock();
return gService->mClearingEntries;
}
// static
void nsCacheService::GetCacheBaseDirectoty(nsIFile** result) {
*result = nullptr;
if (!gService || !gService->mObserver) return;
nsCOMPtr<nsIFile> directory = gService->mObserver->DiskCacheParentDirectory();
if (!directory) return;
directory->Clone(result);
}
// static
void nsCacheService::GetDiskCacheDirectory(nsIFile** result) {
nsCOMPtr<nsIFile> directory;
GetCacheBaseDirectoty(getter_AddRefs(directory));
if (!directory) return;
nsresult rv = directory->AppendNative(NS_LITERAL_CSTRING("Cache"));
if (NS_FAILED(rv)) return;
directory.forget(result);
}
// static
void nsCacheService::GetAppCacheDirectory(nsIFile** result) {
nsCOMPtr<nsIFile> directory;
GetCacheBaseDirectoty(getter_AddRefs(directory));
if (!directory) return;
nsresult rv = directory->AppendNative(NS_LITERAL_CSTRING("OfflineCache"));
if (NS_FAILED(rv)) return;
directory.forget(result);
}
void nsCacheService::LogCacheStatistics() {
uint32_t hitPercentage = 0;
double sum = (double)(mCacheHits + mCacheMisses);
if (sum != 0) {
hitPercentage = (uint32_t)((((double)mCacheHits) / sum) * 100);
}
CACHE_LOG_INFO(("\nCache Service Statistics:\n\n"));
CACHE_LOG_INFO((" TotalEntries = %d\n", mTotalEntries));
CACHE_LOG_INFO((" Cache Hits = %d\n", mCacheHits));
CACHE_LOG_INFO((" Cache Misses = %d\n", mCacheMisses));
CACHE_LOG_INFO((" Cache Hit %% = %d%%\n", hitPercentage));
CACHE_LOG_INFO((" Max Key Length = %d\n", mMaxKeyLength));
CACHE_LOG_INFO((" Max Meta Size = %d\n", mMaxMetaSize));
CACHE_LOG_INFO((" Max Data Size = %d\n", mMaxDataSize));
CACHE_LOG_INFO(("\n"));
CACHE_LOG_INFO(
(" Deactivate Failures = %d\n", mDeactivateFailures));
CACHE_LOG_INFO(
(" Deactivated Unbound Entries = %d\n", mDeactivatedUnboundEntries));
}
void nsCacheService::MoveOrRemoveDiskCache(nsIFile* aOldCacheDir,
nsIFile* aNewCacheDir,
const char* aCacheSubdir) {
bool same;
if (NS_FAILED(aOldCacheDir->Equals(aNewCacheDir, &same)) || same) return;
nsCOMPtr<nsIFile> aOldCacheSubdir;
aOldCacheDir->Clone(getter_AddRefs(aOldCacheSubdir));
nsresult rv = aOldCacheSubdir->AppendNative(nsDependentCString(aCacheSubdir));
if (NS_FAILED(rv)) return;
bool exists;
if (NS_FAILED(aOldCacheSubdir->Exists(&exists)) || !exists) return;
nsCOMPtr<nsIFile> aNewCacheSubdir;
aNewCacheDir->Clone(getter_AddRefs(aNewCacheSubdir));
rv = aNewCacheSubdir->AppendNative(nsDependentCString(aCacheSubdir));
if (NS_FAILED(rv)) return;
PathString newPath = aNewCacheSubdir->NativePath();
if (NS_SUCCEEDED(aNewCacheSubdir->Exists(&exists)) && !exists) {
// New cache directory does not exist, try to move the old one here
// rename needs an empty target directory
// Make sure the parent of the target sub-dir exists
rv = aNewCacheDir->Create(nsIFile::DIRECTORY_TYPE, 0777);
if (NS_SUCCEEDED(rv) || NS_ERROR_FILE_ALREADY_EXISTS == rv) {
PathString oldPath = aOldCacheSubdir->NativePath();
#ifdef XP_WIN
if (MoveFileW(oldPath.get(), newPath.get()))
#else
if (rename(oldPath.get(), newPath.get()) == 0)
#endif
{
return;
}
}
}
// Delay delete by 1 minute to avoid IO thrash on startup.
nsDeleteDir::DeleteDir(aOldCacheSubdir, false, 60000);
}
static bool IsEntryPrivate(nsCacheEntry* entry) { return entry->IsPrivate(); }
void nsCacheService::LeavePrivateBrowsing() {
nsCacheServiceAutoLock lock;
gService->DoomActiveEntries(IsEntryPrivate);
}
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