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gecko/netwerk/cache/nsCacheService.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=8 sts=4 et sw=4 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/ArrayUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/Assertions.h"
#include "mozilla/DebugOnly.h"
#include "necko-config.h"
#include "nsCache.h"
#include "nsCacheService.h"
#include "nsCacheRequest.h"
#include "nsCacheEntry.h"
#include "nsCacheEntryDescriptor.h"
#include "nsCacheDevice.h"
#include "nsMemoryCacheDevice.h"
#include "nsICacheVisitor.h"
#include "nsDiskCacheDevice.h"
#include "nsDiskCacheDeviceSQL.h"
#include "nsCacheUtils.h"
#include "nsIObserverService.h"
#include "nsIPrefService.h"
#include "nsIPrefBranch.h"
#include "nsIFile.h"
#include "nsIOService.h"
#include "nsDirectoryServiceDefs.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsThreadUtils.h"
#include "nsProxyRelease.h"
#include "nsVoidArray.h"
#include "nsDeleteDir.h"
#include "nsNetCID.h"
#include <math.h> // for log()
#include "mozilla/Services.h"
#include "nsITimer.h"
#include "mozIStorageService.h"
#include "mozilla/net/NeckoCommon.h"
#include "mozilla/VisualEventTracer.h"
#include <algorithm>
using namespace mozilla;
/******************************************************************************
* nsCacheProfilePrefObserver
*****************************************************************************/
#define DISK_CACHE_ENABLE_PREF "browser.cache.disk.enable"
#define DISK_CACHE_DIR_PREF "browser.cache.disk.parent_directory"
#define DISK_CACHE_SMART_SIZE_FIRST_RUN_PREF\
"browser.cache.disk.smart_size.first_run"
#define DISK_CACHE_SMART_SIZE_ENABLED_PREF \
"browser.cache.disk.smart_size.enabled"
#define DISK_CACHE_SMART_SIZE_PREF "browser.cache.disk.smart_size_cached_value"
#define DISK_CACHE_CAPACITY_PREF "browser.cache.disk.capacity"
#define DISK_CACHE_MAX_ENTRY_SIZE_PREF "browser.cache.disk.max_entry_size"
#define DISK_CACHE_CAPACITY 256000
#define DISK_CACHE_USE_OLD_MAX_SMART_SIZE_PREF \
"browser.cache.disk.smart_size.use_old_max"
#define OFFLINE_CACHE_ENABLE_PREF "browser.cache.offline.enable"
#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 MEMORY_CACHE_ENABLE_PREF "browser.cache.memory.enable"
#define MEMORY_CACHE_CAPACITY_PREF "browser.cache.memory.capacity"
#define MEMORY_CACHE_MAX_ENTRY_SIZE_PREF "browser.cache.memory.max_entry_size"
#define CACHE_COMPRESSION_LEVEL_PREF "browser.cache.compression_level"
#define CACHE_COMPRESSION_LEVEL 1
#define SANITIZE_ON_SHUTDOWN_PREF "privacy.sanitize.sanitizeOnShutdown"
#define CLEAR_ON_SHUTDOWN_PREF "privacy.clearOnShutdown.cache"
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"
};
static const char * prefList[] = {
DISK_CACHE_ENABLE_PREF,
DISK_CACHE_SMART_SIZE_ENABLED_PREF,
DISK_CACHE_CAPACITY_PREF,
DISK_CACHE_DIR_PREF,
DISK_CACHE_MAX_ENTRY_SIZE_PREF,
DISK_CACHE_USE_OLD_MAX_SMART_SIZE_PREF,
OFFLINE_CACHE_ENABLE_PREF,
OFFLINE_CACHE_CAPACITY_PREF,
OFFLINE_CACHE_DIR_PREF,
MEMORY_CACHE_ENABLE_PREF,
MEMORY_CACHE_CAPACITY_PREF,
MEMORY_CACHE_MAX_ENTRY_SIZE_PREF,
CACHE_COMPRESSION_LEVEL_PREF,
SANITIZE_ON_SHUTDOWN_PREF,
CLEAR_ON_SHUTDOWN_PREF
};
// Cache sizes, in KB
const int32_t DEFAULT_CACHE_SIZE = 250 * 1024; // 250 MB
#ifdef ANDROID
const int32_t MAX_CACHE_SIZE = 200 * 1024; // 200 MB
const int32_t OLD_MAX_CACHE_SIZE = 200 * 1024; // 200 MB
#else
const int32_t MAX_CACHE_SIZE = 350 * 1024; // 350 MB
const int32_t OLD_MAX_CACHE_SIZE = 1024 * 1024; // 1 GB
#endif
// Default cache size was 50 MB for many years until FF 4:
const int32_t PRE_GECKO_2_0_DEFAULT_CACHE_SIZE = 50 * 1024;
class nsCacheProfilePrefObserver : public nsIObserver
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIOBSERVER
nsCacheProfilePrefObserver()
: mHaveProfile(false)
, mDiskCacheEnabled(false)
, mDiskCacheCapacity(0)
, mDiskCacheMaxEntrySize(-1) // -1 means "no limit"
, mSmartSizeEnabled(false)
, mShouldUseOldMaxSmartSize(false)
, mOfflineCacheEnabled(false)
, mOfflineCacheCapacity(0)
, mMemoryCacheEnabled(true)
, mMemoryCacheCapacity(-1)
, mMemoryCacheMaxEntrySize(-1) // -1 means "no limit"
, mCacheCompressionLevel(CACHE_COMPRESSION_LEVEL)
, mSanitizeOnShutdown(false)
, mClearCacheOnShutdown(false)
{
}
virtual ~nsCacheProfilePrefObserver() {}
nsresult Install();
void Remove();
nsresult ReadPrefs(nsIPrefBranch* branch);
bool DiskCacheEnabled();
int32_t DiskCacheCapacity() { return mDiskCacheCapacity; }
void SetDiskCacheCapacity(int32_t);
int32_t DiskCacheMaxEntrySize() { return mDiskCacheMaxEntrySize; }
nsIFile * DiskCacheParentDirectory() { return mDiskCacheParentDirectory; }
bool SmartSizeEnabled() { return mSmartSizeEnabled; }
bool ShouldUseOldMaxSmartSize() { return mShouldUseOldMaxSmartSize; }
void SetUseNewMaxSmartSize(bool useNew) { mShouldUseOldMaxSmartSize = !useNew; }
bool OfflineCacheEnabled();
int32_t OfflineCacheCapacity() { return mOfflineCacheCapacity; }
nsIFile * OfflineCacheParentDirectory() { return mOfflineCacheParentDirectory; }
bool MemoryCacheEnabled();
int32_t MemoryCacheCapacity();
int32_t MemoryCacheMaxEntrySize() { return mMemoryCacheMaxEntrySize; }
int32_t CacheCompressionLevel();
bool SanitizeAtShutdown() { return mSanitizeOnShutdown && mClearCacheOnShutdown; }
static uint32_t GetSmartCacheSize(const nsAString& cachePath,
uint32_t currentSize,
bool shouldUseOldMaxSmartSize);
bool PermittedToSmartSize(nsIPrefBranch*, bool firstRun);
private:
bool mHaveProfile;
bool mDiskCacheEnabled;
int32_t mDiskCacheCapacity; // in kilobytes
int32_t mDiskCacheMaxEntrySize; // in kilobytes
nsCOMPtr<nsIFile> mDiskCacheParentDirectory;
bool mSmartSizeEnabled;
bool mShouldUseOldMaxSmartSize;
bool mOfflineCacheEnabled;
int32_t mOfflineCacheCapacity; // in kilobytes
nsCOMPtr<nsIFile> mOfflineCacheParentDirectory;
bool mMemoryCacheEnabled;
int32_t mMemoryCacheCapacity; // in kilobytes
int32_t mMemoryCacheMaxEntrySize; // in kilobytes
int32_t mCacheCompressionLevel;
bool mSanitizeOnShutdown;
bool mClearCacheOnShutdown;
};
NS_IMPL_ISUPPORTS1(nsCacheProfilePrefObserver, nsIObserver)
class nsSetDiskSmartSizeCallback MOZ_FINAL : public nsITimerCallback
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_IMETHOD Notify(nsITimer* aTimer) {
if (nsCacheService::gService) {
nsCacheServiceAutoLock autoLock(LOCK_TELEM(NSSETDISKSMARTSIZECALLBACK_NOTIFY));
nsCacheService::gService->SetDiskSmartSize_Locked();
nsCacheService::gService->mSmartSizeTimer = nullptr;
}
return NS_OK;
}
};
NS_IMPL_ISUPPORTS1(nsSetDiskSmartSizeCallback, nsITimerCallback)
// Runnable sent to main thread after the cache IO thread calculates available
// disk space, so that there is no race in setting mDiskCacheCapacity.
class nsSetSmartSizeEvent: public nsRunnable
{
public:
nsSetSmartSizeEvent(int32_t smartSize)
: mSmartSize(smartSize) {}
NS_IMETHOD Run()
{
NS_ASSERTION(NS_IsMainThread(),
"Setting smart size data off the main thread");
// Main thread may have already called nsCacheService::Shutdown
if (!nsCacheService::IsInitialized())
return NS_ERROR_NOT_AVAILABLE;
// Ensure smart sizing wasn't switched off while event was pending.
// It is safe to access the observer without the lock since we are
// on the main thread and the value changes only on the main thread.
if (!nsCacheService::gService->mObserver->SmartSizeEnabled())
return NS_OK;
nsCacheService::SetDiskCacheCapacity(mSmartSize);
nsCOMPtr<nsIPrefBranch> ps = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!ps ||
NS_FAILED(ps->SetIntPref(DISK_CACHE_SMART_SIZE_PREF, mSmartSize)))
NS_WARNING("Failed to set smart size pref");
return NS_OK;
}
private:
int32_t mSmartSize;
};
// Runnable sent from main thread to cacheIO thread
class nsGetSmartSizeEvent: public nsRunnable
{
public:
nsGetSmartSizeEvent(const nsAString& cachePath, uint32_t currentSize,
bool shouldUseOldMaxSmartSize)
: mCachePath(cachePath)
, mCurrentSize(currentSize)
, mShouldUseOldMaxSmartSize(shouldUseOldMaxSmartSize)
{}
// Calculates user's disk space available on a background thread and
// dispatches this value back to the main thread.
NS_IMETHOD Run()
{
uint32_t size;
size = nsCacheProfilePrefObserver::GetSmartCacheSize(mCachePath,
mCurrentSize,
mShouldUseOldMaxSmartSize);
NS_DispatchToMainThread(new nsSetSmartSizeEvent(size));
return NS_OK;
}
private:
nsString mCachePath;
uint32_t mCurrentSize;
bool mShouldUseOldMaxSmartSize;
};
class nsBlockOnCacheThreadEvent : public nsRunnable {
public:
nsBlockOnCacheThreadEvent()
{
}
NS_IMETHOD Run()
{
nsCacheServiceAutoLock autoLock(LOCK_TELEM(NSBLOCKONCACHETHREADEVENT_RUN));
#ifdef PR_LOGGING
CACHE_LOG_DEBUG(("nsBlockOnCacheThreadEvent [%p]\n", this));
#endif
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 (unsigned int i=0; i<ArrayLength(observerList); i++) {
rv = observerService->AddObserver(this, observerList[i], false);
if (NS_FAILED(rv))
rv2 = rv;
}
// install preferences observer
nsCOMPtr<nsIPrefBranch> branch = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!branch) return NS_ERROR_FAILURE;
for (unsigned int i=0; i<ArrayLength(prefList); i++) {
rv = branch->AddObserver(prefList[i], this, false);
if (NS_FAILED(rv))
rv2 = rv;
}
// 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 (unsigned int i=0; i<ArrayLength(observerList); i++) {
obs->RemoveObserver(this, observerList[i]);
}
}
// remove Pref Service observers
nsCOMPtr<nsIPrefBranch> prefs =
do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!prefs)
return;
for (unsigned int i=0; i<ArrayLength(prefList); i++)
prefs->RemoveObserver(prefList[i], this); // remove cache pref observers
}
void
nsCacheProfilePrefObserver::SetDiskCacheCapacity(int32_t capacity)
{
mDiskCacheCapacity = std::max(0, capacity);
}
NS_IMETHODIMP
nsCacheProfilePrefObserver::Observe(nsISupports * subject,
const char * topic,
const char16_t * data_unicode)
{
nsresult rv;
NS_ConvertUTF16toUTF8 data(data_unicode);
CACHE_LOG_ALWAYS(("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(!strcmp("shutdown-cleanse",
data.get()));
} 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);
ReadPrefs(branch);
nsCacheService::OnProfileChanged();
} else if (!strcmp(NS_PREFBRANCH_PREFCHANGE_TOPIC_ID, topic)) {
// ignore pref changes until we're done switch profiles
if (!mHaveProfile)
return NS_OK;
nsCOMPtr<nsIPrefBranch> branch = do_QueryInterface(subject, &rv);
if (NS_FAILED(rv))
return rv;
// which preference changed?
if (!strcmp(DISK_CACHE_ENABLE_PREF, data.get())) {
rv = branch->GetBoolPref(DISK_CACHE_ENABLE_PREF,
&mDiskCacheEnabled);
if (NS_FAILED(rv))
return rv;
nsCacheService::SetDiskCacheEnabled(DiskCacheEnabled());
} else if (!strcmp(DISK_CACHE_CAPACITY_PREF, data.get())) {
int32_t capacity = 0;
rv = branch->GetIntPref(DISK_CACHE_CAPACITY_PREF, &capacity);
if (NS_FAILED(rv))
return rv;
mDiskCacheCapacity = std::max(0, capacity);
nsCacheService::SetDiskCacheCapacity(mDiskCacheCapacity);
// Update the cache capacity when smart sizing is turned on/off
} else if (!strcmp(DISK_CACHE_SMART_SIZE_ENABLED_PREF, data.get())) {
// Is the update because smartsizing was turned on, or off?
rv = branch->GetBoolPref(DISK_CACHE_SMART_SIZE_ENABLED_PREF,
&mSmartSizeEnabled);
if (NS_FAILED(rv))
return rv;
int32_t newCapacity = 0;
if (mSmartSizeEnabled) {
nsCacheService::SetDiskSmartSize();
} else {
// Smart sizing switched off: use user specified size
rv = branch->GetIntPref(DISK_CACHE_CAPACITY_PREF, &newCapacity);
if (NS_FAILED(rv))
return rv;
mDiskCacheCapacity = std::max(0, newCapacity);
nsCacheService::SetDiskCacheCapacity(mDiskCacheCapacity);
}
} else if (!strcmp(DISK_CACHE_USE_OLD_MAX_SMART_SIZE_PREF, data.get())) {
rv = branch->GetBoolPref(DISK_CACHE_USE_OLD_MAX_SMART_SIZE_PREF,
&mShouldUseOldMaxSmartSize);
if (NS_FAILED(rv))
return rv;
} else if (!strcmp(DISK_CACHE_MAX_ENTRY_SIZE_PREF, data.get())) {
int32_t newMaxSize;
rv = branch->GetIntPref(DISK_CACHE_MAX_ENTRY_SIZE_PREF,
&newMaxSize);
if (NS_FAILED(rv))
return rv;
mDiskCacheMaxEntrySize = std::max(-1, newMaxSize);
nsCacheService::SetDiskCacheMaxEntrySize(mDiskCacheMaxEntrySize);
#if 0
} else if (!strcmp(DISK_CACHE_DIR_PREF, data.get())) {
// XXX We probaby don't want to respond to this pref except after
// XXX profile changes. Ideally, there should be somekind of user
// XXX notification that the pref change won't take effect until
// XXX the next time the profile changes (browser launch)
#endif
} else
// which preference changed?
if (!strcmp(OFFLINE_CACHE_ENABLE_PREF, data.get())) {
rv = branch->GetBoolPref(OFFLINE_CACHE_ENABLE_PREF,
&mOfflineCacheEnabled);
if (NS_FAILED(rv)) return rv;
nsCacheService::SetOfflineCacheEnabled(OfflineCacheEnabled());
} else if (!strcmp(OFFLINE_CACHE_CAPACITY_PREF, data.get())) {
int32_t capacity = 0;
rv = branch->GetIntPref(OFFLINE_CACHE_CAPACITY_PREF, &capacity);
if (NS_FAILED(rv)) return rv;
mOfflineCacheCapacity = std::max(0, capacity);
nsCacheService::SetOfflineCacheCapacity(mOfflineCacheCapacity);
#if 0
} else if (!strcmp(OFFLINE_CACHE_DIR_PREF, data.get())) {
// XXX We probaby don't want to respond to this pref except after
// XXX profile changes. Ideally, there should be some kind of user
// XXX notification that the pref change won't take effect until
// XXX the next time the profile changes (browser launch)
#endif
} else
if (!strcmp(MEMORY_CACHE_ENABLE_PREF, data.get())) {
rv = branch->GetBoolPref(MEMORY_CACHE_ENABLE_PREF,
&mMemoryCacheEnabled);
if (NS_FAILED(rv))
return rv;
nsCacheService::SetMemoryCache();
} else if (!strcmp(MEMORY_CACHE_CAPACITY_PREF, data.get())) {
mMemoryCacheCapacity = -1;
(void) branch->GetIntPref(MEMORY_CACHE_CAPACITY_PREF,
&mMemoryCacheCapacity);
nsCacheService::SetMemoryCache();
} else if (!strcmp(MEMORY_CACHE_MAX_ENTRY_SIZE_PREF, data.get())) {
int32_t newMaxSize;
rv = branch->GetIntPref(MEMORY_CACHE_MAX_ENTRY_SIZE_PREF,
&newMaxSize);
if (NS_FAILED(rv))
return rv;
mMemoryCacheMaxEntrySize = std::max(-1, newMaxSize);
nsCacheService::SetMemoryCacheMaxEntrySize(mMemoryCacheMaxEntrySize);
} else if (!strcmp(CACHE_COMPRESSION_LEVEL_PREF, data.get())) {
mCacheCompressionLevel = CACHE_COMPRESSION_LEVEL;
(void)branch->GetIntPref(CACHE_COMPRESSION_LEVEL_PREF,
&mCacheCompressionLevel);
mCacheCompressionLevel = std::max(0, mCacheCompressionLevel);
mCacheCompressionLevel = std::min(9, mCacheCompressionLevel);
} else if (!strcmp(SANITIZE_ON_SHUTDOWN_PREF, data.get())) {
rv = branch->GetBoolPref(SANITIZE_ON_SHUTDOWN_PREF,
&mSanitizeOnShutdown);
if (NS_FAILED(rv))
return rv;
nsCacheService::SetDiskCacheEnabled(DiskCacheEnabled());
} else if (!strcmp(CLEAR_ON_SHUTDOWN_PREF, data.get())) {
rv = branch->GetBoolPref(CLEAR_ON_SHUTDOWN_PREF,
&mClearCacheOnShutdown);
if (NS_FAILED(rv))
return rv;
nsCacheService::SetDiskCacheEnabled(DiskCacheEnabled());
}
} else if (!strcmp("last-pb-context-exited", topic)) {
nsCacheService::LeavePrivateBrowsing();
}
return NS_OK;
}
// Returns default ("smart") size (in KB) of cache, given available disk space
// (also in KB)
static uint32_t
SmartCacheSize(const uint32_t availKB, bool shouldUseOldMaxSmartSize)
{
uint32_t maxSize = shouldUseOldMaxSmartSize ? OLD_MAX_CACHE_SIZE : MAX_CACHE_SIZE;
if (availKB > 100 * 1024 * 1024)
return maxSize; // skip computing if we're over 100 GB
// Grow/shrink in 10 MB units, deliberately, so that in the common case we
// don't shrink cache and evict items every time we startup (it's important
// that we don't slow down startup benchmarks).
uint32_t sz10MBs = 0;
uint32_t avail10MBs = availKB / (1024*10);
// .5% of space above 25 GB
if (avail10MBs > 2500) {
sz10MBs += static_cast<uint32_t>((avail10MBs - 2500)*.005);
avail10MBs = 2500;
}
// 1% of space between 7GB -> 25 GB
if (avail10MBs > 700) {
sz10MBs += static_cast<uint32_t>((avail10MBs - 700)*.01);
avail10MBs = 700;
}
// 5% of space between 500 MB -> 7 GB
if (avail10MBs > 50) {
sz10MBs += static_cast<uint32_t>((avail10MBs - 50)*.05);
avail10MBs = 50;
}
#ifdef ANDROID
// On Android, smaller/older devices may have very little storage and
// device owners may be sensitive to storage footprint: Use a smaller
// percentage of available space and a smaller minimum.
// 20% of space up to 500 MB (10 MB min)
sz10MBs += std::max<uint32_t>(1, static_cast<uint32_t>(avail10MBs * .2));
#else
// 40% of space up to 500 MB (50 MB min)
sz10MBs += std::max<uint32_t>(5, static_cast<uint32_t>(avail10MBs * .4));
#endif
return std::min<uint32_t>(maxSize, sz10MBs * 10 * 1024);
}
/* Computes our best guess for the default size of the user's disk cache,
* based on the amount of space they have free on their hard drive.
* We use a tiered scheme: the more space available,
* the larger the disk cache will be. However, we do not want
* to enable the disk cache to grow to an unbounded size, so the larger the
* user's available space is, the smaller of a percentage we take. We set a
* lower bound of 50MB and an upper bound of 1GB.
*
*@param: None.
*@return: The size that the user's disk cache should default to, in kBytes.
*/
uint32_t
nsCacheProfilePrefObserver::GetSmartCacheSize(const nsAString& cachePath,
uint32_t currentSize,
bool shouldUseOldMaxSmartSize)
{
// Check for free space on device where cache directory lives
nsresult rv;
nsCOMPtr<nsIFile>
cacheDirectory (do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv));
if (NS_FAILED(rv) || !cacheDirectory)
return DEFAULT_CACHE_SIZE;
rv = cacheDirectory->InitWithPath(cachePath);
if (NS_FAILED(rv))
return DEFAULT_CACHE_SIZE;
int64_t bytesAvailable;
rv = cacheDirectory->GetDiskSpaceAvailable(&bytesAvailable);
if (NS_FAILED(rv))
return DEFAULT_CACHE_SIZE;
return SmartCacheSize(static_cast<uint32_t>((bytesAvailable / 1024) +
currentSize),
shouldUseOldMaxSmartSize);
}
/* Determine if we are permitted to dynamically size the user's disk cache based
* on their disk space available. We may do this so long as the pref
* smart_size.enabled is true.
*/
bool
nsCacheProfilePrefObserver::PermittedToSmartSize(nsIPrefBranch* branch, bool
firstRun)
{
nsresult rv;
if (firstRun) {
// check if user has set cache size in the past
bool userSet;
rv = branch->PrefHasUserValue(DISK_CACHE_CAPACITY_PREF, &userSet);
if (NS_FAILED(rv)) userSet = true;
if (userSet) {
int32_t oldCapacity;
// If user explicitly set cache size to be smaller than old default
// of 50 MB, then keep user's value. Otherwise use smart sizing.
rv = branch->GetIntPref(DISK_CACHE_CAPACITY_PREF, &oldCapacity);
if (oldCapacity < PRE_GECKO_2_0_DEFAULT_CACHE_SIZE) {
mSmartSizeEnabled = false;
branch->SetBoolPref(DISK_CACHE_SMART_SIZE_ENABLED_PREF,
mSmartSizeEnabled);
return mSmartSizeEnabled;
}
}
// Set manual setting to MAX cache size as starting val for any
// adjustment by user: (bug 559942 comment 65)
int32_t maxSize = mShouldUseOldMaxSmartSize ? OLD_MAX_CACHE_SIZE : MAX_CACHE_SIZE;
branch->SetIntPref(DISK_CACHE_CAPACITY_PREF, maxSize);
}
rv = branch->GetBoolPref(DISK_CACHE_SMART_SIZE_ENABLED_PREF,
&mSmartSizeEnabled);
if (NS_FAILED(rv))
mSmartSizeEnabled = false;
return mSmartSizeEnabled;
}
nsresult
nsCacheProfilePrefObserver::ReadPrefs(nsIPrefBranch* branch)
{
nsresult rv = NS_OK;
// read disk cache device prefs
mDiskCacheEnabled = true; // presume disk cache is enabled
(void) branch->GetBoolPref(DISK_CACHE_ENABLE_PREF, &mDiskCacheEnabled);
mDiskCacheCapacity = DISK_CACHE_CAPACITY;
(void)branch->GetIntPref(DISK_CACHE_CAPACITY_PREF, &mDiskCacheCapacity);
mDiskCacheCapacity = std::max(0, mDiskCacheCapacity);
(void) branch->GetIntPref(DISK_CACHE_MAX_ENTRY_SIZE_PREF,
&mDiskCacheMaxEntrySize);
mDiskCacheMaxEntrySize = std::max(-1, mDiskCacheMaxEntrySize);
(void) branch->GetComplexValue(DISK_CACHE_DIR_PREF, // ignore error
NS_GET_IID(nsIFile),
getter_AddRefs(mDiskCacheParentDirectory));
(void) branch->GetBoolPref(DISK_CACHE_USE_OLD_MAX_SMART_SIZE_PREF,
&mShouldUseOldMaxSmartSize);
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 = do_QueryInterface(directory, &rv);
}
if (mDiskCacheParentDirectory) {
bool firstSmartSizeRun;
rv = branch->GetBoolPref(DISK_CACHE_SMART_SIZE_FIRST_RUN_PREF,
&firstSmartSizeRun);
if (NS_FAILED(rv))
firstSmartSizeRun = false;
if (PermittedToSmartSize(branch, firstSmartSizeRun)) {
// Avoid evictions: use previous cache size until smart size event
// updates mDiskCacheCapacity
rv = branch->GetIntPref(firstSmartSizeRun ?
DISK_CACHE_CAPACITY_PREF :
DISK_CACHE_SMART_SIZE_PREF,
&mDiskCacheCapacity);
if (NS_FAILED(rv))
mDiskCacheCapacity = DEFAULT_CACHE_SIZE;
}
if (firstSmartSizeRun) {
// It is no longer our first run
rv = branch->SetBoolPref(DISK_CACHE_SMART_SIZE_FIRST_RUN_PREF,
false);
if (NS_FAILED(rv))
NS_WARNING("Failed setting first_run pref in ReadPrefs.");
}
}
// read offline cache device prefs
mOfflineCacheEnabled = true; // presume offline cache is enabled
(void) branch->GetBoolPref(OFFLINE_CACHE_ENABLE_PREF,
&mOfflineCacheEnabled);
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 = do_QueryInterface(directory, &rv);
}
// read memory cache device prefs
(void) branch->GetBoolPref(MEMORY_CACHE_ENABLE_PREF, &mMemoryCacheEnabled);
mMemoryCacheCapacity = -1;
(void) branch->GetIntPref(MEMORY_CACHE_CAPACITY_PREF,
&mMemoryCacheCapacity);
(void) branch->GetIntPref(MEMORY_CACHE_MAX_ENTRY_SIZE_PREF,
&mMemoryCacheMaxEntrySize);
mMemoryCacheMaxEntrySize = std::max(-1, mMemoryCacheMaxEntrySize);
// read cache compression level pref
mCacheCompressionLevel = CACHE_COMPRESSION_LEVEL;
(void)branch->GetIntPref(CACHE_COMPRESSION_LEVEL_PREF,
&mCacheCompressionLevel);
mCacheCompressionLevel = std::max(0, mCacheCompressionLevel);
mCacheCompressionLevel = std::min(9, mCacheCompressionLevel);
// read cache shutdown sanitization prefs
(void) branch->GetBoolPref(SANITIZE_ON_SHUTDOWN_PREF,
&mSanitizeOnShutdown);
(void) branch->GetBoolPref(CLEAR_ON_SHUTDOWN_PREF,
&mClearCacheOnShutdown);
return rv;
}
nsresult
nsCacheService::DispatchToCacheIOThread(nsIRunnable* event)
{
if (!gService->mCacheIOThread) return NS_ERROR_NOT_AVAILABLE;
return gService->mCacheIOThread->Dispatch(event, NS_DISPATCH_NORMAL);
}
nsresult
nsCacheService::SyncWithCacheIOThread()
{
gService->mLock.AssertCurrentThreadOwns();
if (!gService->mCacheIOThread) return NS_ERROR_NOT_AVAILABLE;
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
rv = gService->mCondVar.Wait();
return rv;
}
bool
nsCacheProfilePrefObserver::DiskCacheEnabled()
{
if ((mDiskCacheCapacity == 0) || (!mDiskCacheParentDirectory)) return false;
return mDiskCacheEnabled && (!mSanitizeOnShutdown || !mClearCacheOnShutdown);
}
bool
nsCacheProfilePrefObserver::OfflineCacheEnabled()
{
if ((mOfflineCacheCapacity == 0) || (!mOfflineCacheParentDirectory))
return false;
return mOfflineCacheEnabled;
}
bool
nsCacheProfilePrefObserver::MemoryCacheEnabled()
{
if (mMemoryCacheCapacity == 0) return false;
return mMemoryCacheEnabled;
}
/**
* MemoryCacheCapacity
*
* If the browser.cache.memory.capacity preference is positive, we use that
* value for the amount of memory available for the cache.
*
* If browser.cache.memory.capacity is zero, the memory cache is disabled.
*
* If browser.cache.memory.capacity is negative or not present, we use a
* formula that grows less than linearly with the amount of system memory,
* with an upper limit on the cache size. No matter how much physical RAM is
* present, the default cache size would not exceed 32 MB. This maximum would
* apply only to systems with more than 4 GB of RAM (e.g. terminal servers)
*
* RAM Cache
* --- -----
* 32 Mb 2 Mb
* 64 Mb 4 Mb
* 128 Mb 6 Mb
* 256 Mb 10 Mb
* 512 Mb 14 Mb
* 1024 Mb 18 Mb
* 2048 Mb 24 Mb
* 4096 Mb 30 Mb
*
* The equation for this is (for cache size C and memory size K (kbytes)):
* x = log2(K) - 14
* C = x^2/3 + x + 2/3 + 0.1 (0.1 for rounding)
* if (C > 32) C = 32
*/
int32_t
nsCacheProfilePrefObserver::MemoryCacheCapacity()
{
int32_t capacity = mMemoryCacheCapacity;
if (capacity >= 0) {
CACHE_LOG_DEBUG(("Memory cache capacity forced to %d\n", capacity));
return capacity;
}
static uint64_t bytes = PR_GetPhysicalMemorySize();
CACHE_LOG_DEBUG(("Physical Memory size is %llu\n", bytes));
// If getting the physical memory failed, arbitrarily assume
// 32 MB of RAM. We use a low default to have a reasonable
// size on all the devices we support.
if (bytes == 0)
bytes = 32 * 1024 * 1024;
// Conversion from unsigned int64_t to double doesn't work on all platforms.
// We need to truncate the value at INT64_MAX to make sure we don't
// overflow.
if (bytes > INT64_MAX)
bytes = INT64_MAX;
uint64_t kbytes = bytes >> 10;
double kBytesD = double(kbytes);
double x = log(kBytesD)/log(2.0) - 14;
if (x > 0) {
capacity = (int32_t)(x * x / 3.0 + x + 2.0 / 3 + 0.1); // 0.1 for rounding
if (capacity > 32)
capacity = 32;
capacity *= 1024;
} else {
capacity = 0;
}
return capacity;
}
int32_t
nsCacheProfilePrefObserver::CacheCompressionLevel()
{
return mCacheCompressionLevel;
}
/******************************************************************************
* nsProcessRequestEvent
*****************************************************************************/
class nsProcessRequestEvent : public nsRunnable {
public:
nsProcessRequestEvent(nsCacheRequest *aRequest)
{
MOZ_EVENT_TRACER_NAME_OBJECT(aRequest, aRequest->mKey.get());
MOZ_EVENT_TRACER_WAIT(aRequest, "net::cache::ProcessRequest");
mRequest = aRequest;
}
NS_IMETHOD Run()
{
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() {}
private:
nsCacheRequest *mRequest;
};
/******************************************************************************
* nsDoomEvent
*****************************************************************************/
class nsDoomEvent : public nsRunnable {
public:
nsDoomEvent(nsCacheSession *session,
const nsACString &key,
nsICacheListener *listener)
{
mKey = *session->ClientID();
mKey.Append(':');
mKey.Append(key);
mStoragePolicy = session->StoragePolicy();
mListener = listener;
mThread = do_GetCurrentThread();
// 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()
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSDOOMEVENT_RUN));
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) {
mThread->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<nsIThread> mThread;
};
/******************************************************************************
* nsCacheService
*****************************************************************************/
nsCacheService * nsCacheService::gService = nullptr;
NS_IMPL_ISUPPORTS3(nsCacheService, nsICacheService, nsICacheServiceInternal,
nsIMemoryReporter)
nsCacheService::nsCacheService()
: mObserver(nullptr),
mLock("nsCacheService.mLock"),
mCondVar(mLock, "nsCacheService.mCondVar"),
mTimeStampLock("nsCacheService.mTimeStampLock"),
mInitialized(false),
mClearingEntries(false),
mEnableMemoryDevice(true),
mEnableDiskDevice(true),
mMemoryDevice(nullptr),
mDiskDevice(nullptr),
mOfflineDevice(nullptr),
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;
}
CACHE_LOG_INIT();
nsresult rv;
mStorageService = do_GetService("@mozilla.org/storage/service;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
MOZ_EVENT_TRACER_NAME_OBJECT(nsCacheService::gService, "nsCacheService");
rv = NS_NewNamedThread("Cache I/O",
getter_AddRefs(mCacheIOThread));
if (NS_FAILED(rv)) {
NS_RUNTIMEABORT("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
rv = mActiveEntries.Init();
if (NS_FAILED(rv)) return rv;
// create profile/preference observer
if (!mObserver) {
mObserver = new nsCacheProfilePrefObserver();
NS_ADDREF(mObserver);
mObserver->Install();
}
mEnableDiskDevice = mObserver->DiskCacheEnabled();
mEnableOfflineDevice = mObserver->OfflineCacheEnabled();
mEnableMemoryDevice = mObserver->MemoryCacheEnabled();
RegisterWeakMemoryReporter(this);
mInitialized = true;
return NS_OK;
}
// static
PLDHashOperator
nsCacheService::ShutdownCustomCacheDeviceEnum(const nsAString& aProfileDir,
nsRefPtr<nsOfflineCacheDevice>& aDevice,
void* aUserArg)
{
aDevice->Shutdown();
return PL_DHASH_REMOVE;
}
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()) {
NS_RUNTIMEABORT("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();
UnregisterWeakMemoryReporter(this);
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_SHUTDOWN));
NS_ASSERTION(mInitialized, "Bad state");
mInitialized = false;
// Clear entries
ClearDoomList();
if (mSmartSizeTimer) {
mSmartSizeTimer->Cancel();
mSmartSizeTimer = nullptr;
}
// Make sure to wait for any pending cache-operations before
// proceeding with destructive actions (bug #620660)
(void) SyncWithCacheIOThread();
// obtain the disk cache directory in case we need to sanitize it
parentDir = mObserver->DiskCacheParentDirectory();
shouldSanitize = mObserver->SanitizeAtShutdown();
// deallocate memory and disk caches
delete mMemoryDevice;
mMemoryDevice = nullptr;
delete mDiskDevice;
mDiskDevice = nullptr;
if (mOfflineDevice)
mOfflineDevice->Shutdown();
NS_IF_RELEASE(mOfflineDevice);
mCustomOfflineDevices.Enumerate(&nsCacheService::ShutdownCustomCacheDeviceEnum, nullptr);
#ifdef PR_LOGGING
LogCacheStatistics();
#endif
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;
nsCacheService * cacheService = new nsCacheService();
if (cacheService == nullptr)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(cacheService);
rv = cacheService->Init();
if (NS_SUCCEEDED(rv)) {
rv = cacheService->QueryInterface(aIID, aResult);
}
NS_RELEASE(cacheService);
return rv;
}
NS_IMETHODIMP
nsCacheService::CreateSession(const char * clientID,
nsCacheStoragePolicy storagePolicy,
bool streamBased,
nsICacheSession **result)
{
*result = nullptr;
if (this == nullptr) return NS_ERROR_NOT_AVAILABLE;
nsCacheSession * session = new nsCacheSession(clientID, storagePolicy, streamBased);
if (!session) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*result = session);
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 nsRunnable
{
public:
EvictionNotifierRunnable(nsISupports* aSubject)
: 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;
}
} // anonymous namespace
nsresult
nsCacheService::EvictEntriesForClient(const char * clientID,
nsCacheStoragePolicy storagePolicy)
{
nsRefPtr<EvictionNotifierRunnable> r =
new EvictionNotifierRunnable(NS_ISUPPORTS_CAST(nsICacheService*, this));
NS_DispatchToMainThread(r);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_EVICTENTRIESFORCLIENT));
nsresult res = NS_OK;
if (storagePolicy == nsICache::STORE_ANYWHERE ||
storagePolicy == nsICache::STORE_ON_DISK) {
if (mEnableDiskDevice) {
nsresult rv = NS_OK;
if (!mDiskDevice)
rv = CreateDiskDevice();
if (mDiskDevice)
rv = mDiskDevice->EvictEntries(clientID);
if (NS_FAILED(rv))
res = rv;
}
}
// 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;
}
}
if (storagePolicy == nsICache::STORE_ANYWHERE ||
storagePolicy == nsICache::STORE_IN_MEMORY) {
// If there is no memory device, there is no need to evict it...
if (mMemoryDevice) {
nsresult rv = mMemoryDevice->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 = gService->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()));
NS_ASSERTION(gService, "nsCacheService::gService is null.");
if (!gService->mInitialized)
return NS_ERROR_NOT_INITIALIZED;
return DispatchToCacheIOThread(new nsDoomEvent(session, key, listener));
}
bool
nsCacheService::IsStorageEnabledForPolicy_Locked(nsCacheStoragePolicy storagePolicy)
{
if (gService->mEnableMemoryDevice &&
(storagePolicy == nsICache::STORE_ANYWHERE ||
storagePolicy == nsICache::STORE_IN_MEMORY)) {
return true;
}
if (gService->mEnableDiskDevice &&
(storagePolicy == nsICache::STORE_ANYWHERE ||
storagePolicy == nsICache::STORE_ON_DISK)) {
return true;
}
if (gService->mEnableOfflineDevice &&
storagePolicy == nsICache::STORE_OFFLINE) {
return true;
}
return false;
}
NS_IMETHODIMP nsCacheService::VisitEntries(nsICacheVisitor *visitor)
{
NS_ENSURE_ARG_POINTER(visitor);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_VISITENTRIES));
if (!(mEnableDiskDevice || mEnableMemoryDevice))
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 there is no memory device, there are then also no entries to visit...
if (mMemoryDevice) {
rv = mMemoryDevice->Visit(visitor);
if (NS_FAILED(rv)) return rv;
}
if (mEnableDiskDevice) {
if (!mDiskDevice) {
rv = CreateDiskDevice();
if (NS_FAILED(rv)) return rv;
}
rv = mDiskDevice->Visit(visitor);
if (NS_FAILED(rv)) return rv;
}
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)
{
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 = NS_NewRunnableMethod(this,
&nsCacheService::FireClearNetworkCacheStoredAnywhereNotification);
NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
} 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;
}
/* nsICacheServiceInternal
* readonly attribute double lockHeldTime;
*/
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::CreateDiskDevice()
{
if (!mInitialized) return NS_ERROR_NOT_AVAILABLE;
if (!mEnableDiskDevice) return NS_ERROR_NOT_AVAILABLE;
if (mDiskDevice) return NS_OK;
mDiskDevice = new nsDiskCacheDevice;
if (!mDiskDevice) return NS_ERROR_OUT_OF_MEMORY;
// set the preferences
mDiskDevice->SetCacheParentDirectory(mObserver->DiskCacheParentDirectory());
mDiskDevice->SetCapacity(mObserver->DiskCacheCapacity());
mDiskDevice->SetMaxEntrySize(mObserver->DiskCacheMaxEntrySize());
nsresult rv = mDiskDevice->Init();
if (NS_FAILED(rv)) {
#if DEBUG
printf("###\n");
printf("### mDiskDevice->Init() failed (0x%.8x)\n",
static_cast<uint32_t>(rv));
printf("### - disabling disk cache for this session.\n");
printf("###\n");
#endif
mEnableDiskDevice = false;
delete mDiskDevice;
mDiskDevice = nullptr;
return rv;
}
Telemetry::Accumulate(Telemetry::DISK_CACHE_SMART_SIZE_USING_OLD_MAX,
mObserver->ShouldUseOldMaxSmartSize());
NS_ASSERTION(!mSmartSizeTimer, "Smartsize timer was already fired!");
// Disk device is usually created during the startup. Delay smart size
// calculation to avoid possible massive IO caused by eviction of entries
// in case the new smart size is smaller than current cache usage.
mSmartSizeTimer = do_CreateInstance("@mozilla.org/timer;1", &rv);
if (NS_SUCCEEDED(rv)) {
rv = mSmartSizeTimer->InitWithCallback(new nsSetDiskSmartSizeCallback(),
1000*60*3,
nsITimer::TYPE_ONE_SHOT);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to post smart size timer");
mSmartSizeTimer = nullptr;
}
} else {
NS_WARNING("Can't create smart size timer");
}
// Ignore state of the timer and return success since the purpose of the
// method (create the disk-device) has been fulfilled
return NS_OK;
}
// Runnable sent from cache thread to main thread
class nsDisableOldMaxSmartSizePrefEvent: public nsRunnable
{
public:
nsDisableOldMaxSmartSizePrefEvent() {}
NS_IMETHOD Run()
{
// Main thread may have already called nsCacheService::Shutdown
if (!nsCacheService::IsInitialized())
return NS_ERROR_NOT_AVAILABLE;
nsCOMPtr<nsIPrefBranch> branch = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!branch) {
return NS_ERROR_NOT_AVAILABLE;
}
nsresult rv = branch->SetBoolPref(DISK_CACHE_USE_OLD_MAX_SMART_SIZE_PREF, false);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to disable old max smart size");
return rv;
}
// It is safe to call SetDiskSmartSize_Locked() without holding the lock
// when we are on main thread and nsCacheService is initialized.
nsCacheService::gService->SetDiskSmartSize_Locked();
if (nsCacheService::gService->mObserver->PermittedToSmartSize(branch, false)) {
rv = branch->SetIntPref(DISK_CACHE_CAPACITY_PREF, MAX_CACHE_SIZE);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to set cache capacity pref");
}
}
return NS_OK;
}
};
void
nsCacheService::MarkStartingFresh()
{
if (!gService->mObserver->ShouldUseOldMaxSmartSize()) {
// Already using new max, nothing to do here
return;
}
gService->mObserver->SetUseNewMaxSmartSize(true);
// We always dispatch an event here because we don't want to deal with lock
// reentrance issues.
NS_DispatchToMainThread(new nsDisableOldMaxSmartSizePrefEvent());
}
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, *aDevice);
}
return NS_OK;
}
nsresult
nsCacheService::CreateOfflineDevice()
{
CACHE_LOG_ALWAYS(("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 defined(PR_LOGGING)
nsAutoCString profilePath;
aProfileDir->GetNativePath(profilePath);
CACHE_LOG_ALWAYS(("Creating custom offline device, %s, %d",
profilePath.BeginReading(), aQuota));
#endif
if (!mInitialized) return NS_ERROR_NOT_AVAILABLE;
if (!mEnableOfflineDevice) return NS_ERROR_NOT_AVAILABLE;
*aDevice = new nsOfflineCacheDevice;
NS_ADDREF(*aDevice);
// set the preferences
(*aDevice)->SetCacheParentDirectory(aProfileDir);
(*aDevice)->SetCapacity(aQuota);
nsresult rv = (*aDevice)->InitWithSqlite(mStorageService);
if (NS_FAILED(rv)) {
CACHE_LOG_DEBUG(("OfflineDevice->InitWithSqlite() failed (0x%.8x)\n", rv));
CACHE_LOG_DEBUG((" - disabling offline cache for this session.\n"));
NS_RELEASE(*aDevice);
}
return rv;
}
nsresult
nsCacheService::CreateMemoryDevice()
{
if (!mInitialized) return NS_ERROR_NOT_AVAILABLE;
if (!mEnableMemoryDevice) return NS_ERROR_NOT_AVAILABLE;
if (mMemoryDevice) return NS_OK;
mMemoryDevice = new nsMemoryCacheDevice;
if (!mMemoryDevice) return NS_ERROR_OUT_OF_MEMORY;
// set preference
int32_t capacity = mObserver->MemoryCacheCapacity();
CACHE_LOG_DEBUG(("Creating memory device with capacity %d\n", capacity));
mMemoryDevice->SetCapacity(capacity);
mMemoryDevice->SetMaxEntrySize(mObserver->MemoryCacheMaxEntrySize());
nsresult rv = mMemoryDevice->Init();
if (NS_FAILED(rv)) {
NS_WARNING("Initialization of Memory Cache failed.");
delete mMemoryDevice;
mMemoryDevice = nullptr;
}
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)->mThread = do_GetCurrentThread();
return NS_OK;
}
class nsCacheListenerEvent : public nsRunnable
{
public:
nsCacheListenerEvent(nsICacheListener *listener,
nsICacheEntryDescriptor *descriptor,
nsCacheAccessMode accessGranted,
nsresult status)
: mListener(listener) // transfers reference
, mDescriptor(descriptor) // transfers reference (may be null)
, mAccessGranted(accessGranted)
, mStatus(status)
{}
NS_IMETHOD Run()
{
mozilla::eventtracer::AutoEventTracer tracer(
static_cast<nsIRunnable*>(this),
eventtracer::eExec,
eventtracer::eDone,
"net::cache::OnCacheEntryAvailable");
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->mThread, "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;
}
MOZ_EVENT_TRACER_NAME_OBJECT(ev.get(), request->mKey.get());
MOZ_EVENT_TRACER_WAIT(ev.get(), "net::cache::OnCacheEntryAvailable");
return request->mThread->Dispatch(ev, NS_DISPATCH_NORMAL);
}
nsresult
nsCacheService::ProcessRequest(nsCacheRequest * request,
bool calledFromOpenCacheEntry,
nsICacheEntryDescriptor ** result)
{
mozilla::eventtracer::AutoEventTracer tracer(
request,
eventtracer::eExec,
eventtracer::eDone,
"net::cache::ProcessRequest");
// !!! must be called with mLock held !!!
nsresult rv;
nsCacheEntry * entry = nullptr;
nsCacheEntry * doomedEntry = nullptr;
nsCacheAccessMode accessGranted = nsICache::ACCESS_NONE;
if (result) *result = nullptr;
while(1) { // Activate entry loop
rv = ActivateEntry(request, &entry, &doomedEntry); // get the entry for this request
if (NS_FAILED(rv)) break;
while(1) { // 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 {
nsRefPtr<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));
NS_ASSERTION(gService, "nsCacheService::gService is null.");
if (result)
*result = nullptr;
if (!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;
mozilla::eventtracer::AutoEventTracer tracer(
request,
eventtracer::eExec,
eventtracer::eDone,
"net::cache::ActivateEntry");
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 (!mEnableMemoryDevice && !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;
MOZ_EVENT_TRACER_NAME_OBJECT(key, key->BeginReading());
eventtracer::AutoEventTracer searchCacheDevices(
key,
eventtracer::eExec,
eventtracer::eDone,
"net::cache::SearchCacheDevices");
CACHE_LOG_DEBUG(("mMemoryDevice: 0x%p\n", mMemoryDevice));
*collision = false;
if ((policy == nsICache::STORE_ANYWHERE) || (policy == nsICache::STORE_IN_MEMORY)) {
// If there is no memory device, then there is nothing to search...
if (mMemoryDevice) {
entry = mMemoryDevice->FindEntry(key, collision);
CACHE_LOG_DEBUG(("Searching mMemoryDevice for key %s found: 0x%p, "
"collision: %d\n", key->get(), entry, collision));
}
}
if (!entry &&
((policy == nsICache::STORE_ANYWHERE) || (policy == nsICache::STORE_ON_DISK))) {
if (mEnableDiskDevice) {
if (!mDiskDevice) {
nsresult rv = CreateDiskDevice();
if (NS_FAILED(rv))
return nullptr;
}
entry = mDiskDevice->FindEntry(key, collision);
}
}
if (!entry && (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;
int64_t predictedDataSize = entry->PredictedDataSize();
if (entry->IsStreamData() && entry->IsAllowedOnDisk() && mEnableDiskDevice) {
// this is the default
if (!mDiskDevice) {
(void)CreateDiskDevice(); // ignore the error (check for mDiskDevice instead)
}
if (mDiskDevice) {
// Bypass the cache if Content-Length says the entry will be too big
if (predictedDataSize != -1 &&
mDiskDevice->EntryIsTooBig(predictedDataSize)) {
DebugOnly<nsresult> rv = nsCacheService::DoomEntry(entry);
NS_ASSERTION(NS_SUCCEEDED(rv),"DoomEntry() failed.");
return nullptr;
}
entry->MarkBinding(); // enter state of binding
nsresult rv = mDiskDevice->BindEntry(entry);
entry->ClearBinding(); // exit state of binding
if (NS_SUCCEEDED(rv))
device = mDiskDevice;
}
}
// if we can't use mDiskDevice, try mMemoryDevice
if (!device && mEnableMemoryDevice && entry->IsAllowedInMemory()) {
if (!mMemoryDevice) {
(void)CreateMemoryDevice(); // ignore the error (check for mMemoryDevice instead)
}
if (mMemoryDevice) {
// Bypass the cache if Content-Length says entry will be too big
if (predictedDataSize != -1 &&
mMemoryDevice->EntryIsTooBig(predictedDataSize)) {
DebugOnly<nsresult> rv = nsCacheService::DoomEntry(entry);
NS_ASSERTION(NS_SUCCEEDED(rv),"DoomEntry() failed.");
return nullptr;
}
entry->MarkBinding(); // enter state of binding
nsresult rv = mMemoryDevice->BindEntry(entry);
entry->ClearBinding(); // exit state of binding
if (NS_SUCCEEDED(rv))
device = mMemoryDevice;
}
}
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(bool cleanse)
{
if (!gService) return;
if (!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->mDiskDevice && gService->mEnableDiskDevice) {
if (cleanse)
gService->mDiskDevice->EvictEntries(nullptr);
gService->mDiskDevice->Shutdown();
}
gService->mEnableDiskDevice = false;
if (gService->mOfflineDevice && gService->mEnableOfflineDevice) {
if (cleanse)
gService->mOfflineDevice->EvictEntries(nullptr);
gService->mOfflineDevice->Shutdown();
}
gService->mCustomOfflineDevices.Enumerate(
&nsCacheService::ShutdownCustomCacheDeviceEnum, nullptr);
gService->mEnableOfflineDevice = false;
if (gService->mMemoryDevice) {
// clear memory cache
gService->mMemoryDevice->EvictEntries(nullptr);
}
gService->mClearingEntries = false;
}
void
nsCacheService::OnProfileChanged()
{
if (!gService) return;
CACHE_LOG_DEBUG(("nsCacheService::OnProfileChanged"));
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_ONPROFILECHANGED));
gService->mEnableDiskDevice = gService->mObserver->DiskCacheEnabled();
gService->mEnableOfflineDevice = gService->mObserver->OfflineCacheEnabled();
gService->mEnableMemoryDevice = gService->mObserver->MemoryCacheEnabled();
if (gService->mDiskDevice) {
gService->mDiskDevice->SetCacheParentDirectory(gService->mObserver->DiskCacheParentDirectory());
gService->mDiskDevice->SetCapacity(gService->mObserver->DiskCacheCapacity());
// XXX initialization of mDiskDevice could be made lazily, if mEnableDiskDevice is false
nsresult rv = gService->mDiskDevice->Init();
if (NS_FAILED(rv)) {
NS_ERROR("nsCacheService::OnProfileChanged: Re-initializing disk device failed");
gService->mEnableDiskDevice = false;
// XXX delete mDiskDevice?
}
}
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?
}
}
// If memoryDevice exists, reset its size to the new profile
if (gService->mMemoryDevice) {
if (gService->mEnableMemoryDevice) {
// make sure that capacity is reset to the right value
int32_t capacity = gService->mObserver->MemoryCacheCapacity();
CACHE_LOG_DEBUG(("Resetting memory device capacity to %d\n",
capacity));
gService->mMemoryDevice->SetCapacity(capacity);
} else {
// tell memory device to evict everything
CACHE_LOG_DEBUG(("memory device disabled\n"));
gService->mMemoryDevice->SetCapacity(0);
// Don't delete memory device, because some entries may be active still...
}
}
}
void
nsCacheService::SetDiskCacheEnabled(bool enabled)
{
if (!gService) return;
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_SETDISKCACHEENABLED));
gService->mEnableDiskDevice = enabled;
}
void
nsCacheService::SetDiskCacheCapacity(int32_t capacity)
{
if (!gService) return;
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_SETDISKCACHECAPACITY));
if (gService->mDiskDevice) {
gService->mDiskDevice->SetCapacity(capacity);
}
gService->mEnableDiskDevice = gService->mObserver->DiskCacheEnabled();
}
void
nsCacheService::SetDiskCacheMaxEntrySize(int32_t maxSize)
{
if (!gService) return;
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_SETDISKCACHEMAXENTRYSIZE));
if (gService->mDiskDevice) {
gService->mDiskDevice->SetMaxEntrySize(maxSize);
}
}
void
nsCacheService::SetMemoryCacheMaxEntrySize(int32_t maxSize)
{
if (!gService) return;
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_SETMEMORYCACHEMAXENTRYSIZE));
if (gService->mMemoryDevice) {
gService->mMemoryDevice->SetMaxEntrySize(maxSize);
}
}
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();
}
void
nsCacheService::SetMemoryCache()
{
if (!gService) return;
CACHE_LOG_DEBUG(("nsCacheService::SetMemoryCache"));
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_SETMEMORYCACHE));
gService->mEnableMemoryDevice = gService->mObserver->MemoryCacheEnabled();
if (gService->mEnableMemoryDevice) {
if (gService->mMemoryDevice) {
int32_t capacity = gService->mObserver->MemoryCacheCapacity();
// make sure that capacity is reset to the right value
CACHE_LOG_DEBUG(("Resetting memory device capacity to %d\n",
capacity));
gService->mMemoryDevice->SetCapacity(capacity);
}
} else {
if (gService->mMemoryDevice) {
// tell memory device to evict everything
CACHE_LOG_DEBUG(("memory device disabled\n"));
gService->mMemoryDevice->SetCapacity(0);
// Don't delete memory device, because some entries may be active still...
}
}
}
/******************************************************************************
* 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(mozilla::Telemetry::ID mainThreadLockerID)
{
mozilla::Telemetry::ID lockerID;
mozilla::Telemetry::ID 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());
MOZ_EVENT_TRACER_WAIT(nsCacheService::gService, "net::cache::lock");
gService->mLock.Lock();
gService->LockAcquired();
TimeStamp stop(TimeStamp::Now());
MOZ_EVENT_TRACER_EXEC(nsCacheService::gService, "net::cache::lock");
// 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();
MOZ_EVENT_TRACER_DONE(nsCacheService::gService, "net::cache::lock");
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(target, 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)
{
mozilla::eventtracer::AutoEventTracer tracer(
entry,
eventtracer::eExec,
eventtracer::eDone,
"net::cache::ProcessPendingRequests");
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;
}
}
PLDHashOperator
nsCacheService::GetActiveEntries(PLDHashTable * table,
PLDHashEntryHdr * hdr,
uint32_t number,
void * arg)
{
static_cast<nsVoidArray *>(arg)->AppendElement(
((nsCacheEntryHashTableEntry *)hdr)->cacheEntry);
return PL_DHASH_NEXT;
}
struct ActiveEntryArgs
{
nsTArray<nsCacheEntry*>* mActiveArray;
nsCacheService::DoomCheckFn mCheckFn;
};
void
nsCacheService::DoomActiveEntries(DoomCheckFn check)
{
nsAutoTArray<nsCacheEntry*, 8> array;
ActiveEntryArgs args = { &array, check };
mActiveEntries.VisitEntries(RemoveActiveEntry, &args);
uint32_t count = array.Length();
for (uint32_t i=0; i < count; ++i)
DoomEntry_Internal(array[i], true);
}
PLDHashOperator
nsCacheService::RemoveActiveEntry(PLDHashTable * table,
PLDHashEntryHdr * hdr,
uint32_t number,
void * arg)
{
nsCacheEntry * entry = ((nsCacheEntryHashTableEntry *)hdr)->cacheEntry;
NS_ASSERTION(entry, "### active entry = nullptr!");
ActiveEntryArgs* args = static_cast<ActiveEntryArgs*>(arg);
if (args->mCheckFn && !args->mCheckFn(entry))
return PL_DHASH_NEXT;
NS_ASSERTION(args->mActiveArray, "### array = nullptr!");
args->mActiveArray->AppendElement(entry);
// entry is being removed from the active entry list
entry->MarkInactive();
return PL_DHASH_REMOVE; // and continue enumerating
}
void
nsCacheService::CloseAllStreams()
{
nsTArray<nsRefPtr<nsCacheEntryDescriptor::nsInputStreamWrapper> > inputs;
nsTArray<nsRefPtr<nsCacheEntryDescriptor::nsOutputStreamWrapper> > outputs;
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_CLOSEALLSTREAMS));
nsVoidArray entries;
#if DEBUG
// make sure there is no active entry
mActiveEntries.VisitEntries(GetActiveEntries, &entries);
NS_ASSERTION(entries.Count() == 0, "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 (int32_t i = 0 ; i < entries.Count() ; i++) {
entry = static_cast<nsCacheEntry *>(entries.ElementAt(i));
nsTArray<nsRefPtr<nsCacheEntryDescriptor> > descs;
entry->GetDescriptors(descs);
for (uint32_t j = 0 ; j < descs.Length() ; j++) {
if (descs[j]->mOutputWrapper)
outputs.AppendElement(descs[j]->mOutputWrapper);
for (int32_t k = 0 ; k < descs[j]->mInputWrappers.Count() ; k++)
inputs.AppendElement(static_cast<
nsCacheEntryDescriptor::nsInputStreamWrapper *>(
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::GetDiskCacheDirectory(nsIFile ** result) {
*result = nullptr;
if (gService && gService->mObserver) {
nsCOMPtr<nsIFile> directory =
gService->mObserver->DiskCacheParentDirectory();
if (!directory)
return;
nsresult rv = directory->AppendNative(NS_LITERAL_CSTRING("Cache"));
if (NS_FAILED(rv))
return;
directory.forget(result);
}
}
#if defined(PR_LOGGING)
void
nsCacheService::LogCacheStatistics()
{
uint32_t hitPercentage = (uint32_t)((((double)mCacheHits) /
((double)(mCacheHits + mCacheMisses))) * 100);
CACHE_LOG_ALWAYS(("\nCache Service Statistics:\n\n"));
CACHE_LOG_ALWAYS((" TotalEntries = %d\n", mTotalEntries));
CACHE_LOG_ALWAYS((" Cache Hits = %d\n", mCacheHits));
CACHE_LOG_ALWAYS((" Cache Misses = %d\n", mCacheMisses));
CACHE_LOG_ALWAYS((" Cache Hit %% = %d%%\n", hitPercentage));
CACHE_LOG_ALWAYS((" Max Key Length = %d\n", mMaxKeyLength));
CACHE_LOG_ALWAYS((" Max Meta Size = %d\n", mMaxMetaSize));
CACHE_LOG_ALWAYS((" Max Data Size = %d\n", mMaxDataSize));
CACHE_LOG_ALWAYS(("\n"));
CACHE_LOG_ALWAYS((" Deactivate Failures = %d\n",
mDeactivateFailures));
CACHE_LOG_ALWAYS((" Deactivated Unbound Entries = %d\n",
mDeactivatedUnboundEntries));
}
#endif
nsresult
nsCacheService::SetDiskSmartSize()
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHESERVICE_SETDISKSMARTSIZE));
if (!gService) return NS_ERROR_NOT_AVAILABLE;
return gService->SetDiskSmartSize_Locked();
}
nsresult
nsCacheService::SetDiskSmartSize_Locked()
{
nsresult rv;
if (!mObserver->DiskCacheParentDirectory())
return NS_ERROR_NOT_AVAILABLE;
if (!mDiskDevice)
return NS_ERROR_NOT_AVAILABLE;
if (!mObserver->SmartSizeEnabled())
return NS_ERROR_NOT_AVAILABLE;
nsAutoString cachePath;
rv = mObserver->DiskCacheParentDirectory()->GetPath(cachePath);
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsIRunnable> event =
new nsGetSmartSizeEvent(cachePath, mDiskDevice->getCacheSize(),
mObserver->ShouldUseOldMaxSmartSize());
DispatchToCacheIOThread(event);
} else {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
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;
nsAutoCString newPath;
rv = aNewCacheSubdir->GetNativePath(newPath);
if (NS_FAILED(rv))
return;
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) {
nsAutoCString oldPath;
rv = aOldCacheSubdir->GetNativePath(oldPath);
if (NS_FAILED(rv))
return;
if (rename(oldPath.get(), newPath.get()) == 0)
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(LOCK_TELEM(NSCACHESERVICE_LEAVEPRIVATEBROWSING));
gService->DoomActiveEntries(IsEntryPrivate);
if (gService->mMemoryDevice) {
// clear memory cache
gService->mMemoryDevice->EvictPrivateEntries();
}
}
MOZ_DEFINE_MALLOC_SIZE_OF(DiskCacheDeviceMallocSizeOf)
NS_IMETHODIMP
nsCacheService::CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData)
{
size_t disk = 0;
if (mDiskDevice) {
nsCacheServiceAutoLock
lock(LOCK_TELEM(NSCACHESERVICE_DISKDEVICEHEAPSIZE));
disk = mDiskDevice->SizeOfIncludingThis(DiskCacheDeviceMallocSizeOf);
}
size_t memory = mMemoryDevice ? mMemoryDevice->TotalSize() : 0;
#define REPORT(_path, _amount, _desc) \
do { \
nsresult rv; \
rv = aHandleReport->Callback(EmptyCString(), \
NS_LITERAL_CSTRING(_path), \
KIND_HEAP, UNITS_BYTES, _amount, \
NS_LITERAL_CSTRING(_desc), aData); \
NS_ENSURE_SUCCESS(rv, rv); \
} while (0)
REPORT("explicit/network/disk-cache", disk,
"Memory used by the network disk cache.");
REPORT("explicit/network/memory-cache", memory,
"Memory used by the network memory cache.");
return NS_OK;
}
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