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gecko-dev/netwerk/cache2/CacheIndex.cpp
Chris Peterson 2afd829d0f Bug 1469769 - Part 6: Replace non-failing NS_NOTREACHED with MOZ_ASSERT_UNREACHABLE. r=froydnj 
This patch is an automatic replacement of s/NS_NOTREACHED/MOZ_ASSERT_UNREACHABLE/. Reindenting long lines and whitespace fixups follow in patch 6b.

MozReview-Commit-ID: 5UQVHElSpCr

--HG--
extra : rebase_source : 4c1b2fc32b269342f07639266b64941e2270e9c4
extra : source : 907543f6eae716f23a6de52b1ffb1c82908d158a
2018-06-17 22:43:11 -07:00

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/* 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 "CacheIndex.h"
#include "CacheLog.h"
#include "CacheFileIOManager.h"
#include "CacheFileMetadata.h"
#include "CacheIndexIterator.h"
#include "CacheIndexContextIterator.h"
#include "nsThreadUtils.h"
#include "nsISimpleEnumerator.h"
#include "nsIDirectoryEnumerator.h"
#include "nsISizeOf.h"
#include "nsPrintfCString.h"
#include "mozilla/DebugOnly.h"
#include "prinrval.h"
#include "nsIFile.h"
#include "nsITimer.h"
#include "mozilla/AutoRestore.h"
#include <algorithm>
#include "mozilla/Telemetry.h"
#include "mozilla/Unused.h"
#define kMinUnwrittenChanges 300
#define kMinDumpInterval 20000 // in milliseconds
#define kMaxBufSize 16384
#define kIndexVersion 0x00000005
#define kUpdateIndexStartDelay 50000 // in milliseconds
#define INDEX_NAME "index"
#define TEMP_INDEX_NAME "index.tmp"
#define JOURNAL_NAME "index.log"
namespace mozilla {
namespace net {
namespace {
class FrecencyComparator
{
public:
bool Equals(CacheIndexRecord* a, CacheIndexRecord* b) const {
if (!a || !b) {
return false;
}
return a->mFrecency == b->mFrecency;
}
bool LessThan(CacheIndexRecord* a, CacheIndexRecord* b) const {
// Removed (=null) entries must be at the end of the array.
if (!a) {
return false;
}
if (!b) {
return true;
}
// Place entries with frecency 0 at the end of the non-removed entries.
if (a->mFrecency == 0) {
return false;
}
if (b->mFrecency == 0) {
return true;
}
return a->mFrecency < b->mFrecency;
}
};
} // namespace
/**
* This helper class is responsible for keeping CacheIndex::mIndexStats and
* CacheIndex::mFrecencyArray up to date.
*/
class CacheIndexEntryAutoManage
{
public:
CacheIndexEntryAutoManage(const SHA1Sum::Hash *aHash, CacheIndex *aIndex)
: mIndex(aIndex)
, mOldRecord(nullptr)
, mOldFrecency(0)
, mDoNotSearchInIndex(false)
, mDoNotSearchInUpdates(false)
{
CacheIndex::sLock.AssertCurrentThreadOwns();
mHash = aHash;
const CacheIndexEntry *entry = FindEntry();
mIndex->mIndexStats.BeforeChange(entry);
if (entry && entry->IsInitialized() && !entry->IsRemoved()) {
mOldRecord = entry->mRec;
mOldFrecency = entry->mRec->mFrecency;
}
}
~CacheIndexEntryAutoManage()
{
CacheIndex::sLock.AssertCurrentThreadOwns();
const CacheIndexEntry *entry = FindEntry();
mIndex->mIndexStats.AfterChange(entry);
if (!entry || !entry->IsInitialized() || entry->IsRemoved()) {
entry = nullptr;
}
if (entry && !mOldRecord) {
mIndex->mFrecencyArray.AppendRecord(entry->mRec);
mIndex->AddRecordToIterators(entry->mRec);
} else if (!entry && mOldRecord) {
mIndex->mFrecencyArray.RemoveRecord(mOldRecord);
mIndex->RemoveRecordFromIterators(mOldRecord);
} else if (entry && mOldRecord) {
if (entry->mRec != mOldRecord) {
// record has a different address, we have to replace it
mIndex->ReplaceRecordInIterators(mOldRecord, entry->mRec);
if (entry->mRec->mFrecency == mOldFrecency) {
// If frecency hasn't changed simply replace the pointer
mIndex->mFrecencyArray.ReplaceRecord(mOldRecord, entry->mRec);
} else {
// Remove old pointer and insert the new one at the end of the array
mIndex->mFrecencyArray.RemoveRecord(mOldRecord);
mIndex->mFrecencyArray.AppendRecord(entry->mRec);
}
} else if (entry->mRec->mFrecency != mOldFrecency) {
// Move the element at the end of the array
mIndex->mFrecencyArray.RemoveRecord(entry->mRec);
mIndex->mFrecencyArray.AppendRecord(entry->mRec);
}
} else {
// both entries were removed or not initialized, do nothing
}
}
// We cannot rely on nsTHashtable::GetEntry() in case we are removing entries
// while iterating. Destructor is called before the entry is removed. Caller
// must call one of following methods to skip lookup in the hashtable.
void DoNotSearchInIndex() { mDoNotSearchInIndex = true; }
void DoNotSearchInUpdates() { mDoNotSearchInUpdates = true; }
private:
const CacheIndexEntry * FindEntry()
{
const CacheIndexEntry *entry = nullptr;
switch (mIndex->mState) {
case CacheIndex::READING:
case CacheIndex::WRITING:
if (!mDoNotSearchInUpdates) {
entry = mIndex->mPendingUpdates.GetEntry(*mHash);
}
MOZ_FALLTHROUGH;
case CacheIndex::BUILDING:
case CacheIndex::UPDATING:
case CacheIndex::READY:
if (!entry && !mDoNotSearchInIndex) {
entry = mIndex->mIndex.GetEntry(*mHash);
}
break;
case CacheIndex::INITIAL:
case CacheIndex::SHUTDOWN:
default:
MOZ_ASSERT(false, "Unexpected state!");
}
return entry;
}
const SHA1Sum::Hash *mHash;
RefPtr<CacheIndex> mIndex;
CacheIndexRecord *mOldRecord;
uint32_t mOldFrecency;
bool mDoNotSearchInIndex;
bool mDoNotSearchInUpdates;
};
class FileOpenHelper final : public CacheFileIOListener
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
explicit FileOpenHelper(CacheIndex* aIndex)
: mIndex(aIndex)
, mCanceled(false)
{}
void Cancel() {
CacheIndex::sLock.AssertCurrentThreadOwns();
mCanceled = true;
}
private:
virtual ~FileOpenHelper() = default;
NS_IMETHOD OnFileOpened(CacheFileHandle *aHandle, nsresult aResult) override;
NS_IMETHOD OnDataWritten(CacheFileHandle *aHandle, const char *aBuf,
nsresult aResult) override {
MOZ_CRASH("FileOpenHelper::OnDataWritten should not be called!");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHOD OnDataRead(CacheFileHandle *aHandle, char *aBuf,
nsresult aResult) override {
MOZ_CRASH("FileOpenHelper::OnDataRead should not be called!");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHOD OnFileDoomed(CacheFileHandle *aHandle, nsresult aResult) override {
MOZ_CRASH("FileOpenHelper::OnFileDoomed should not be called!");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHOD OnEOFSet(CacheFileHandle *aHandle, nsresult aResult) override {
MOZ_CRASH("FileOpenHelper::OnEOFSet should not be called!");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHOD OnFileRenamed(CacheFileHandle *aHandle, nsresult aResult) override {
MOZ_CRASH("FileOpenHelper::OnFileRenamed should not be called!");
return NS_ERROR_UNEXPECTED;
}
RefPtr<CacheIndex> mIndex;
bool mCanceled;
};
NS_IMETHODIMP FileOpenHelper::OnFileOpened(CacheFileHandle *aHandle,
nsresult aResult)
{
StaticMutexAutoLock lock(CacheIndex::sLock);
if (mCanceled) {
if (aHandle) {
CacheFileIOManager::DoomFile(aHandle, nullptr);
}
return NS_OK;
}
mIndex->OnFileOpenedInternal(this, aHandle, aResult);
return NS_OK;
}
NS_IMPL_ISUPPORTS(FileOpenHelper, CacheFileIOListener);
StaticRefPtr<CacheIndex> CacheIndex::gInstance;
StaticMutex CacheIndex::sLock;
NS_IMPL_ADDREF(CacheIndex)
NS_IMPL_RELEASE(CacheIndex)
NS_INTERFACE_MAP_BEGIN(CacheIndex)
NS_INTERFACE_MAP_ENTRY(mozilla::net::CacheFileIOListener)
NS_INTERFACE_MAP_ENTRY(nsIRunnable)
NS_INTERFACE_MAP_END
CacheIndex::CacheIndex()
: mState(INITIAL)
, mShuttingDown(false)
, mIndexNeedsUpdate(false)
, mRemovingAll(false)
, mIndexOnDiskIsValid(false)
, mDontMarkIndexClean(false)
, mIndexTimeStamp(0)
, mUpdateEventPending(false)
, mSkipEntries(0)
, mProcessEntries(0)
, mRWBuf(nullptr)
, mRWBufSize(0)
, mRWBufPos(0)
, mRWPending(false)
, mJournalReadSuccessfully(false)
, mAsyncGetDiskConsumptionBlocked(false)
{
sLock.AssertCurrentThreadOwns();
LOG(("CacheIndex::CacheIndex [this=%p]", this));
MOZ_ASSERT(!gInstance, "multiple CacheIndex instances!");
}
CacheIndex::~CacheIndex()
{
sLock.AssertCurrentThreadOwns();
LOG(("CacheIndex::~CacheIndex [this=%p]", this));
ReleaseBuffer();
}
// static
nsresult
CacheIndex::Init(nsIFile *aCacheDirectory)
{
LOG(("CacheIndex::Init()"));
MOZ_ASSERT(NS_IsMainThread());
StaticMutexAutoLock lock(sLock);
if (gInstance) {
return NS_ERROR_ALREADY_INITIALIZED;
}
RefPtr<CacheIndex> idx = new CacheIndex();
nsresult rv = idx->InitInternal(aCacheDirectory);
NS_ENSURE_SUCCESS(rv, rv);
gInstance = idx.forget();
return NS_OK;
}
nsresult
CacheIndex::InitInternal(nsIFile *aCacheDirectory)
{
nsresult rv;
rv = aCacheDirectory->Clone(getter_AddRefs(mCacheDirectory));
NS_ENSURE_SUCCESS(rv, rv);
mStartTime = TimeStamp::NowLoRes();
ReadIndexFromDisk();
return NS_OK;
}
// static
nsresult
CacheIndex::PreShutdown()
{
MOZ_ASSERT(NS_IsMainThread());
StaticMutexAutoLock lock(sLock);
LOG(("CacheIndex::PreShutdown() [gInstance=%p]", gInstance.get()));
nsresult rv;
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
LOG(("CacheIndex::PreShutdown() - [state=%d, indexOnDiskIsValid=%d, "
"dontMarkIndexClean=%d]", index->mState, index->mIndexOnDiskIsValid,
index->mDontMarkIndexClean));
LOG(("CacheIndex::PreShutdown() - Closing iterators."));
for (uint32_t i = 0; i < index->mIterators.Length(); ) {
rv = index->mIterators[i]->CloseInternal(NS_ERROR_FAILURE);
if (NS_FAILED(rv)) {
// CacheIndexIterator::CloseInternal() removes itself from mIteratos iff
// it returns success.
LOG(("CacheIndex::PreShutdown() - Failed to remove iterator %p. "
"[rv=0x%08" PRIx32 "]", index->mIterators[i], static_cast<uint32_t>(rv)));
i++;
}
}
index->mShuttingDown = true;
if (index->mState == READY) {
return NS_OK; // nothing to do
}
nsCOMPtr<nsIRunnable> event;
event = NewRunnableMethod("net::CacheIndex::PreShutdownInternal",
index,
&CacheIndex::PreShutdownInternal);
nsCOMPtr<nsIEventTarget> ioTarget = CacheFileIOManager::IOTarget();
MOZ_ASSERT(ioTarget);
// PreShutdownInternal() will be executed before any queued event on INDEX
// level. That's OK since we don't want to wait for any operation in progess.
rv = ioTarget->Dispatch(event, nsIEventTarget::DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING("CacheIndex::PreShutdown() - Can't dispatch event");
LOG(("CacheIndex::PreShutdown() - Can't dispatch event" ));
return rv;
}
return NS_OK;
}
void
CacheIndex::PreShutdownInternal()
{
StaticMutexAutoLock lock(sLock);
LOG(("CacheIndex::PreShutdownInternal() - [state=%d, indexOnDiskIsValid=%d, "
"dontMarkIndexClean=%d]", mState, mIndexOnDiskIsValid,
mDontMarkIndexClean));
MOZ_ASSERT(mShuttingDown);
if (mUpdateTimer) {
mUpdateTimer->Cancel();
mUpdateTimer = nullptr;
}
switch (mState) {
case WRITING:
FinishWrite(false);
break;
case READY:
// nothing to do, write the journal in Shutdown()
break;
case READING:
FinishRead(false);
break;
case BUILDING:
case UPDATING:
FinishUpdate(false);
break;
default:
MOZ_ASSERT(false, "Implement me!");
}
// We should end up in READY state
MOZ_ASSERT(mState == READY);
}
// static
nsresult
CacheIndex::Shutdown()
{
MOZ_ASSERT(NS_IsMainThread());
StaticMutexAutoLock lock(sLock);
LOG(("CacheIndex::Shutdown() [gInstance=%p]", gInstance.get()));
RefPtr<CacheIndex> index = gInstance.forget();
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
bool sanitize = CacheObserver::ClearCacheOnShutdown();
LOG(("CacheIndex::Shutdown() - [state=%d, indexOnDiskIsValid=%d, "
"dontMarkIndexClean=%d, sanitize=%d]", index->mState,
index->mIndexOnDiskIsValid, index->mDontMarkIndexClean, sanitize));
MOZ_ASSERT(index->mShuttingDown);
EState oldState = index->mState;
index->ChangeState(SHUTDOWN);
if (oldState != READY) {
LOG(("CacheIndex::Shutdown() - Unexpected state. Did posting of "
"PreShutdownInternal() fail?"));
}
switch (oldState) {
case WRITING:
index->FinishWrite(false);
MOZ_FALLTHROUGH;
case READY:
if (index->mIndexOnDiskIsValid && !index->mDontMarkIndexClean) {
if (!sanitize && NS_FAILED(index->WriteLogToDisk())) {
index->RemoveJournalAndTempFile();
}
} else {
index->RemoveJournalAndTempFile();
}
break;
case READING:
index->FinishRead(false);
break;
case BUILDING:
case UPDATING:
index->FinishUpdate(false);
break;
default:
MOZ_ASSERT(false, "Unexpected state!");
}
if (sanitize) {
index->RemoveAllIndexFiles();
}
return NS_OK;
}
// static
nsresult
CacheIndex::AddEntry(const SHA1Sum::Hash *aHash)
{
LOG(("CacheIndex::AddEntry() [hash=%08x%08x%08x%08x%08x]", LOGSHA1(aHash)));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
// Getters in CacheIndexStats assert when mStateLogged is true since the
// information is incomplete between calls to BeforeChange() and AfterChange()
// (i.e. while CacheIndexEntryAutoManage exists). We need to check whether
// non-fresh entries exists outside the scope of CacheIndexEntryAutoManage.
bool updateIfNonFreshEntriesExist = false;
{
CacheIndexEntryAutoManage entryMng(aHash, index);
CacheIndexEntry *entry = index->mIndex.GetEntry(*aHash);
bool entryRemoved = entry && entry->IsRemoved();
CacheIndexEntryUpdate *updated = nullptr;
if (index->mState == READY || index->mState == UPDATING ||
index->mState == BUILDING) {
MOZ_ASSERT(index->mPendingUpdates.Count() == 0);
if (entry && !entryRemoved) {
// Found entry in index that shouldn't exist.
if (entry->IsFresh()) {
// Someone removed the file on disk while FF is running. Update
// process can fix only non-fresh entries (i.e. entries that were not
// added within this session). Start update only if we have such
// entries.
//
// TODO: This should be very rare problem. If it turns out not to be
// true, change the update process so that it also iterates all
// initialized non-empty entries and checks whether the file exists.
LOG(("CacheIndex::AddEntry() - Cache file was removed outside FF "
"process!"));
updateIfNonFreshEntriesExist = true;
} else if (index->mState == READY) {
// Index is outdated, update it.
LOG(("CacheIndex::AddEntry() - Found entry that shouldn't exist, "
"update is needed"));
index->mIndexNeedsUpdate = true;
} else {
// We cannot be here when building index since all entries are fresh
// during building.
MOZ_ASSERT(index->mState == UPDATING);
}
}
if (!entry) {
entry = index->mIndex.PutEntry(*aHash);
}
} else { // WRITING, READING
updated = index->mPendingUpdates.GetEntry(*aHash);
bool updatedRemoved = updated && updated->IsRemoved();
if ((updated && !updatedRemoved) ||
(!updated && entry && !entryRemoved && entry->IsFresh())) {
// Fresh entry found, so the file was removed outside FF
LOG(("CacheIndex::AddEntry() - Cache file was removed outside FF "
"process!"));
updateIfNonFreshEntriesExist = true;
} else if (!updated && entry && !entryRemoved) {
if (index->mState == WRITING) {
LOG(("CacheIndex::AddEntry() - Found entry that shouldn't exist, "
"update is needed"));
index->mIndexNeedsUpdate = true;
}
// Ignore if state is READING since the index information is partial
}
updated = index->mPendingUpdates.PutEntry(*aHash);
}
if (updated) {
updated->InitNew();
updated->MarkDirty();
updated->MarkFresh();
} else {
entry->InitNew();
entry->MarkDirty();
entry->MarkFresh();
}
}
if (updateIfNonFreshEntriesExist &&
index->mIndexStats.Count() != index->mIndexStats.Fresh()) {
index->mIndexNeedsUpdate = true;
}
index->StartUpdatingIndexIfNeeded();
index->WriteIndexToDiskIfNeeded();
return NS_OK;
}
// static
nsresult
CacheIndex::EnsureEntryExists(const SHA1Sum::Hash *aHash)
{
LOG(("CacheIndex::EnsureEntryExists() [hash=%08x%08x%08x%08x%08x]",
LOGSHA1(aHash)));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
{
CacheIndexEntryAutoManage entryMng(aHash, index);
CacheIndexEntry *entry = index->mIndex.GetEntry(*aHash);
bool entryRemoved = entry && entry->IsRemoved();
if (index->mState == READY || index->mState == UPDATING ||
index->mState == BUILDING) {
MOZ_ASSERT(index->mPendingUpdates.Count() == 0);
if (!entry || entryRemoved) {
if (entryRemoved && entry->IsFresh()) {
// This could happen only if somebody copies files to the entries
// directory while FF is running.
LOG(("CacheIndex::EnsureEntryExists() - Cache file was added outside "
"FF process! Update is needed."));
index->mIndexNeedsUpdate = true;
} else if (index->mState == READY ||
(entryRemoved && !entry->IsFresh())) {
// Removed non-fresh entries can be present as a result of
// MergeJournal()
LOG(("CacheIndex::EnsureEntryExists() - Didn't find entry that should"
" exist, update is needed"));
index->mIndexNeedsUpdate = true;
}
if (!entry) {
entry = index->mIndex.PutEntry(*aHash);
}
entry->InitNew();
entry->MarkDirty();
}
entry->MarkFresh();
} else { // WRITING, READING
CacheIndexEntryUpdate *updated = index->mPendingUpdates.GetEntry(*aHash);
bool updatedRemoved = updated && updated->IsRemoved();
if (updatedRemoved ||
(!updated && entryRemoved && entry->IsFresh())) {
// Fresh information about missing entry found. This could happen only
// if somebody copies files to the entries directory while FF is running.
LOG(("CacheIndex::EnsureEntryExists() - Cache file was added outside "
"FF process! Update is needed."));
index->mIndexNeedsUpdate = true;
} else if (!updated && (!entry || entryRemoved)) {
if (index->mState == WRITING) {
LOG(("CacheIndex::EnsureEntryExists() - Didn't find entry that should"
" exist, update is needed"));
index->mIndexNeedsUpdate = true;
}
// Ignore if state is READING since the index information is partial
}
// We don't need entryRemoved and updatedRemoved info anymore
if (entryRemoved) entry = nullptr;
if (updatedRemoved) updated = nullptr;
if (updated) {
updated->MarkFresh();
} else {
if (!entry) {
// Create a new entry
updated = index->mPendingUpdates.PutEntry(*aHash);
updated->InitNew();
updated->MarkFresh();
updated->MarkDirty();
} else {
if (!entry->IsFresh()) {
// To mark the entry fresh we must make a copy of index entry
// since the index is read-only.
updated = index->mPendingUpdates.PutEntry(*aHash);
*updated = *entry;
updated->MarkFresh();
}
}
}
}
}
index->StartUpdatingIndexIfNeeded();
index->WriteIndexToDiskIfNeeded();
return NS_OK;
}
// static
nsresult
CacheIndex::InitEntry(const SHA1Sum::Hash *aHash,
OriginAttrsHash aOriginAttrsHash,
bool aAnonymous,
bool aPinned)
{
LOG(("CacheIndex::InitEntry() [hash=%08x%08x%08x%08x%08x, "
"originAttrsHash=%" PRIx64 ", anonymous=%d, pinned=%d]", LOGSHA1(aHash),
aOriginAttrsHash, aAnonymous, aPinned));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
{
CacheIndexEntryAutoManage entryMng(aHash, index);
CacheIndexEntry *entry = index->mIndex.GetEntry(*aHash);
CacheIndexEntryUpdate *updated = nullptr;
bool reinitEntry = false;
if (entry && entry->IsRemoved()) {
entry = nullptr;
}
if (index->mState == READY || index->mState == UPDATING ||
index->mState == BUILDING) {
MOZ_ASSERT(index->mPendingUpdates.Count() == 0);
MOZ_ASSERT(entry);
MOZ_ASSERT(entry->IsFresh());
if (!entry) {
LOG(("CacheIndex::InitEntry() - Entry was not found in mIndex!"));
NS_WARNING(("CacheIndex::InitEntry() - Entry was not found in mIndex!"));
return NS_ERROR_UNEXPECTED;
}
if (IsCollision(entry, aOriginAttrsHash, aAnonymous)) {
index->mIndexNeedsUpdate = true; // TODO Does this really help in case of collision?
reinitEntry = true;
} else {
if (entry->IsInitialized()) {
return NS_OK;
}
}
} else {
updated = index->mPendingUpdates.GetEntry(*aHash);
DebugOnly<bool> removed = updated && updated->IsRemoved();
MOZ_ASSERT(updated || !removed);
MOZ_ASSERT(updated || entry);
if (!updated && !entry) {
LOG(("CacheIndex::InitEntry() - Entry was found neither in mIndex nor "
"in mPendingUpdates!"));
NS_WARNING(("CacheIndex::InitEntry() - Entry was found neither in "
"mIndex nor in mPendingUpdates!"));
return NS_ERROR_UNEXPECTED;
}
if (updated) {
MOZ_ASSERT(updated->IsFresh());
if (IsCollision(updated, aOriginAttrsHash, aAnonymous)) {
index->mIndexNeedsUpdate = true;
reinitEntry = true;
} else {
if (updated->IsInitialized()) {
return NS_OK;
}
}
} else {
MOZ_ASSERT(entry->IsFresh());
if (IsCollision(entry, aOriginAttrsHash, aAnonymous)) {
index->mIndexNeedsUpdate = true;
reinitEntry = true;
} else {
if (entry->IsInitialized()) {
return NS_OK;
}
}
// make a copy of a read-only entry
updated = index->mPendingUpdates.PutEntry(*aHash);
*updated = *entry;
}
}
if (reinitEntry) {
// There is a collision and we are going to rewrite this entry. Initialize
// it as a new entry.
if (updated) {
updated->InitNew();
updated->MarkFresh();
} else {
entry->InitNew();
entry->MarkFresh();
}
}
if (updated) {
updated->Init(aOriginAttrsHash, aAnonymous, aPinned);
updated->MarkDirty();
} else {
entry->Init(aOriginAttrsHash, aAnonymous, aPinned);
entry->MarkDirty();
}
}
index->StartUpdatingIndexIfNeeded();
index->WriteIndexToDiskIfNeeded();
return NS_OK;
}
// static
nsresult
CacheIndex::RemoveEntry(const SHA1Sum::Hash *aHash)
{
LOG(("CacheIndex::RemoveEntry() [hash=%08x%08x%08x%08x%08x]",
LOGSHA1(aHash)));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
{
CacheIndexEntryAutoManage entryMng(aHash, index);
CacheIndexEntry *entry = index->mIndex.GetEntry(*aHash);
bool entryRemoved = entry && entry->IsRemoved();
if (index->mState == READY || index->mState == UPDATING ||
index->mState == BUILDING) {
MOZ_ASSERT(index->mPendingUpdates.Count() == 0);
if (!entry || entryRemoved) {
if (entryRemoved && entry->IsFresh()) {
// This could happen only if somebody copies files to the entries
// directory while FF is running.
LOG(("CacheIndex::RemoveEntry() - Cache file was added outside FF "
"process! Update is needed."));
index->mIndexNeedsUpdate = true;
} else if (index->mState == READY ||
(entryRemoved && !entry->IsFresh())) {
// Removed non-fresh entries can be present as a result of
// MergeJournal()
LOG(("CacheIndex::RemoveEntry() - Didn't find entry that should exist"
", update is needed"));
index->mIndexNeedsUpdate = true;
}
} else {
if (entry) {
if (!entry->IsDirty() && entry->IsFileEmpty()) {
index->mIndex.RemoveEntry(entry);
entry = nullptr;
} else {
entry->MarkRemoved();
entry->MarkDirty();
entry->MarkFresh();
}
}
}
} else { // WRITING, READING
CacheIndexEntryUpdate *updated = index->mPendingUpdates.GetEntry(*aHash);
bool updatedRemoved = updated && updated->IsRemoved();
if (updatedRemoved ||
(!updated && entryRemoved && entry->IsFresh())) {
// Fresh information about missing entry found. This could happen only
// if somebody copies files to the entries directory while FF is running.
LOG(("CacheIndex::RemoveEntry() - Cache file was added outside FF "
"process! Update is needed."));
index->mIndexNeedsUpdate = true;
} else if (!updated && (!entry || entryRemoved)) {
if (index->mState == WRITING) {
LOG(("CacheIndex::RemoveEntry() - Didn't find entry that should exist"
", update is needed"));
index->mIndexNeedsUpdate = true;
}
// Ignore if state is READING since the index information is partial
}
if (!updated) {
updated = index->mPendingUpdates.PutEntry(*aHash);
updated->InitNew();
}
updated->MarkRemoved();
updated->MarkDirty();
updated->MarkFresh();
}
}
index->StartUpdatingIndexIfNeeded();
index->WriteIndexToDiskIfNeeded();
return NS_OK;
}
// static
nsresult
CacheIndex::UpdateEntry(const SHA1Sum::Hash *aHash,
const uint32_t *aFrecency,
const uint32_t *aExpirationTime,
const bool *aHasAltData,
const uint16_t *aOnStartTime,
const uint16_t *aOnStopTime,
const uint32_t *aSize)
{
LOG(("CacheIndex::UpdateEntry() [hash=%08x%08x%08x%08x%08x, "
"frecency=%s, expirationTime=%s, hasAltData=%s, onStartTime=%s, "
"onStopTime=%s, size=%s]", LOGSHA1(aHash),
aFrecency ? nsPrintfCString("%u", *aFrecency).get() : "",
aExpirationTime ? nsPrintfCString("%u", *aExpirationTime).get() : "",
aHasAltData ? (*aHasAltData ? "true" : "false") : "",
aOnStartTime ? nsPrintfCString("%u", *aOnStartTime).get() : "",
aOnStopTime ? nsPrintfCString("%u", *aOnStopTime).get() : "",
aSize ? nsPrintfCString("%u", *aSize).get() : ""));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
{
CacheIndexEntryAutoManage entryMng(aHash, index);
CacheIndexEntry *entry = index->mIndex.GetEntry(*aHash);
if (entry && entry->IsRemoved()) {
entry = nullptr;
}
if (index->mState == READY || index->mState == UPDATING ||
index->mState == BUILDING) {
MOZ_ASSERT(index->mPendingUpdates.Count() == 0);
MOZ_ASSERT(entry);
if (!entry) {
LOG(("CacheIndex::UpdateEntry() - Entry was not found in mIndex!"));
NS_WARNING(("CacheIndex::UpdateEntry() - Entry was not found in mIndex!"));
return NS_ERROR_UNEXPECTED;
}
if (!HasEntryChanged(entry, aFrecency, aExpirationTime, aHasAltData,
aOnStartTime, aOnStopTime, aSize)) {
return NS_OK;
}
MOZ_ASSERT(entry->IsFresh());
MOZ_ASSERT(entry->IsInitialized());
entry->MarkDirty();
if (aFrecency) {
entry->SetFrecency(*aFrecency);
}
if (aExpirationTime) {
entry->SetExpirationTime(*aExpirationTime);
}
if (aHasAltData) {
entry->SetHasAltData(*aHasAltData);
}
if (aOnStartTime) {
entry->SetOnStartTime(*aOnStartTime);
}
if (aOnStopTime) {
entry->SetOnStopTime(*aOnStopTime);
}
if (aSize) {
entry->SetFileSize(*aSize);
}
} else {
CacheIndexEntryUpdate *updated = index->mPendingUpdates.GetEntry(*aHash);
DebugOnly<bool> removed = updated && updated->IsRemoved();
MOZ_ASSERT(updated || !removed);
MOZ_ASSERT(updated || entry);
if (!updated) {
if (!entry) {
LOG(("CacheIndex::UpdateEntry() - Entry was found neither in mIndex "
"nor in mPendingUpdates!"));
NS_WARNING(("CacheIndex::UpdateEntry() - Entry was found neither in "
"mIndex nor in mPendingUpdates!"));
return NS_ERROR_UNEXPECTED;
}
// make a copy of a read-only entry
updated = index->mPendingUpdates.PutEntry(*aHash);
*updated = *entry;
}
MOZ_ASSERT(updated->IsFresh());
MOZ_ASSERT(updated->IsInitialized());
updated->MarkDirty();
if (aFrecency) {
updated->SetFrecency(*aFrecency);
}
if (aExpirationTime) {
updated->SetExpirationTime(*aExpirationTime);
}
if (aHasAltData) {
updated->SetHasAltData(*aHasAltData);
}
if (aOnStartTime) {
updated->SetOnStartTime(*aOnStartTime);
}
if (aOnStopTime) {
updated->SetOnStopTime(*aOnStopTime);
}
if (aSize) {
updated->SetFileSize(*aSize);
}
}
}
index->WriteIndexToDiskIfNeeded();
return NS_OK;
}
// static
nsresult
CacheIndex::RemoveAll()
{
LOG(("CacheIndex::RemoveAll()"));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
nsCOMPtr<nsIFile> file;
{
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
MOZ_ASSERT(!index->mRemovingAll);
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
AutoRestore<bool> saveRemovingAll(index->mRemovingAll);
index->mRemovingAll = true;
// Doom index and journal handles but don't null them out since this will be
// done in FinishWrite/FinishRead methods.
if (index->mIndexHandle) {
CacheFileIOManager::DoomFile(index->mIndexHandle, nullptr);
} else {
// We don't have a handle to index file, so get the file here, but delete
// it outside the lock. Ignore the result since this is not fatal.
index->GetFile(NS_LITERAL_CSTRING(INDEX_NAME), getter_AddRefs(file));
}
if (index->mJournalHandle) {
CacheFileIOManager::DoomFile(index->mJournalHandle, nullptr);
}
switch (index->mState) {
case WRITING:
index->FinishWrite(false);
break;
case READY:
// nothing to do
break;
case READING:
index->FinishRead(false);
break;
case BUILDING:
case UPDATING:
index->FinishUpdate(false);
break;
default:
MOZ_ASSERT(false, "Unexpected state!");
}
// We should end up in READY state
MOZ_ASSERT(index->mState == READY);
// There should not be any handle
MOZ_ASSERT(!index->mIndexHandle);
MOZ_ASSERT(!index->mJournalHandle);
index->mIndexOnDiskIsValid = false;
index->mIndexNeedsUpdate = false;
index->mIndexStats.Clear();
index->mFrecencyArray.Clear();
index->mIndex.Clear();
for (uint32_t i = 0; i < index->mIterators.Length(); ) {
nsresult rv = index->mIterators[i]->CloseInternal(NS_ERROR_NOT_AVAILABLE);
if (NS_FAILED(rv)) {
// CacheIndexIterator::CloseInternal() removes itself from mIterators
// iff it returns success.
LOG(("CacheIndex::RemoveAll() - Failed to remove iterator %p. "
"[rv=0x%08" PRIx32 "]", index->mIterators[i], static_cast<uint32_t>(rv)));
i++;
}
}
}
if (file) {
// Ignore the result. The file might not exist and the failure is not fatal.
file->Remove(false);
}
return NS_OK;
}
// static
nsresult
CacheIndex::HasEntry(const nsACString &aKey, EntryStatus *_retval,
const std::function<void(const CacheIndexEntry*)> &aCB)
{
LOG(("CacheIndex::HasEntry() [key=%s]", PromiseFlatCString(aKey).get()));
SHA1Sum sum;
SHA1Sum::Hash hash;
sum.update(aKey.BeginReading(), aKey.Length());
sum.finish(hash);
return HasEntry(hash, _retval, aCB);
}
// static
nsresult
CacheIndex::HasEntry(const SHA1Sum::Hash &hash, EntryStatus *_retval,
const std::function<void(const CacheIndexEntry*)> &aCB)
{
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
const CacheIndexEntry *entry = nullptr;
switch (index->mState) {
case READING:
case WRITING:
entry = index->mPendingUpdates.GetEntry(hash);
MOZ_FALLTHROUGH;
case BUILDING:
case UPDATING:
case READY:
if (!entry) {
entry = index->mIndex.GetEntry(hash);
}
break;
case INITIAL:
case SHUTDOWN:
MOZ_ASSERT(false, "Unexpected state!");
}
if (!entry) {
if (index->mState == READY || index->mState == WRITING) {
*_retval = DOES_NOT_EXIST;
} else {
*_retval = DO_NOT_KNOW;
}
} else {
if (entry->IsRemoved()) {
if (entry->IsFresh()) {
*_retval = DOES_NOT_EXIST;
} else {
*_retval = DO_NOT_KNOW;
}
} else {
*_retval = EXISTS;
if (aCB) {
aCB(entry);
}
}
}
LOG(("CacheIndex::HasEntry() - result is %u", *_retval));
return NS_OK;
}
// static
nsresult
CacheIndex::GetEntryForEviction(bool aIgnoreEmptyEntries, SHA1Sum::Hash *aHash, uint32_t *aCnt)
{
LOG(("CacheIndex::GetEntryForEviction()"));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index)
return NS_ERROR_NOT_INITIALIZED;
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
SHA1Sum::Hash hash;
CacheIndexRecord *foundRecord = nullptr;
uint32_t skipped = 0;
// find first non-forced valid and unpinned entry with the lowest frecency
index->mFrecencyArray.SortIfNeeded();
for (auto iter = index->mFrecencyArray.Iter(); !iter.Done(); iter.Next()) {
CacheIndexRecord *rec = iter.Get();
memcpy(&hash, rec->mHash, sizeof(SHA1Sum::Hash));
++skipped;
if (IsForcedValidEntry(&hash)) {
continue;
}
if (CacheIndexEntry::IsPinned(rec)) {
continue;
}
if (aIgnoreEmptyEntries && !CacheIndexEntry::GetFileSize(rec)) {
continue;
}
--skipped;
foundRecord = rec;
break;
}
if (!foundRecord)
return NS_ERROR_NOT_AVAILABLE;
*aCnt = skipped;
LOG(("CacheIndex::GetEntryForEviction() - returning entry from frecency "
"array [hash=%08x%08x%08x%08x%08x, cnt=%u, frecency=%u]",
LOGSHA1(&hash), *aCnt, foundRecord->mFrecency));
memcpy(aHash, &hash, sizeof(SHA1Sum::Hash));
return NS_OK;
}
// static
bool CacheIndex::IsForcedValidEntry(const SHA1Sum::Hash *aHash)
{
RefPtr<CacheFileHandle> handle;
CacheFileIOManager::gInstance->mHandles.GetHandle(
aHash, getter_AddRefs(handle));
if (!handle)
return false;
nsCString hashKey = handle->Key();
return CacheStorageService::Self()->IsForcedValidEntry(hashKey);
}
// static
nsresult
CacheIndex::GetCacheSize(uint32_t *_retval)
{
LOG(("CacheIndex::GetCacheSize()"));
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index)
return NS_ERROR_NOT_INITIALIZED;
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
*_retval = index->mIndexStats.Size();
LOG(("CacheIndex::GetCacheSize() - returning %u", *_retval));
return NS_OK;
}
// static
nsresult
CacheIndex::GetEntryFileCount(uint32_t *_retval)
{
LOG(("CacheIndex::GetEntryFileCount()"));
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
*_retval = index->mIndexStats.ActiveEntriesCount();
LOG(("CacheIndex::GetEntryFileCount() - returning %u", *_retval));
return NS_OK;
}
// static
nsresult
CacheIndex::GetCacheStats(nsILoadContextInfo *aInfo, uint32_t *aSize, uint32_t *aCount)
{
LOG(("CacheIndex::GetCacheStats() [info=%p]", aInfo));
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
*aSize = 0;
*aCount = 0;
for (auto iter = index->mFrecencyArray.Iter(); !iter.Done(); iter.Next()) {
CacheIndexRecord *record = iter.Get();
if (aInfo && !CacheIndexEntry::RecordMatchesLoadContextInfo(record, aInfo))
continue;
*aSize += CacheIndexEntry::GetFileSize(record);
++*aCount;
}
return NS_OK;
}
// static
nsresult
CacheIndex::AsyncGetDiskConsumption(nsICacheStorageConsumptionObserver* aObserver)
{
LOG(("CacheIndex::AsyncGetDiskConsumption()"));
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
RefPtr<DiskConsumptionObserver> observer =
DiskConsumptionObserver::Init(aObserver);
NS_ENSURE_ARG(observer);
if ((index->mState == READY || index->mState == WRITING) &&
!index->mAsyncGetDiskConsumptionBlocked) {
LOG(("CacheIndex::AsyncGetDiskConsumption - calling immediately"));
// Safe to call the callback under the lock,
// we always post to the main thread.
observer->OnDiskConsumption(index->mIndexStats.Size() << 10);
return NS_OK;
}
LOG(("CacheIndex::AsyncGetDiskConsumption - remembering callback"));
// Will be called when the index get to the READY state.
index->mDiskConsumptionObservers.AppendElement(observer);
// Move forward with index re/building if it is pending
RefPtr<CacheIOThread> ioThread = CacheFileIOManager::IOThread();
if (ioThread) {
ioThread->Dispatch(
NS_NewRunnableFunction("net::CacheIndex::AsyncGetDiskConsumption",
[]() -> void {
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (index && index->mUpdateTimer) {
index->mUpdateTimer->Cancel();
index->DelayedUpdateLocked();
}
}),
CacheIOThread::INDEX);
}
return NS_OK;
}
// static
nsresult
CacheIndex::GetIterator(nsILoadContextInfo *aInfo, bool aAddNew,
CacheIndexIterator **_retval)
{
LOG(("CacheIndex::GetIterator() [info=%p, addNew=%d]", aInfo, aAddNew));
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
RefPtr<CacheIndexIterator> idxIter;
if (aInfo) {
idxIter = new CacheIndexContextIterator(index, aAddNew, aInfo);
} else {
idxIter = new CacheIndexIterator(index, aAddNew);
}
index->mFrecencyArray.SortIfNeeded();
for (auto iter = index->mFrecencyArray.Iter(); !iter.Done(); iter.Next()) {
idxIter->AddRecord(iter.Get());
}
index->mIterators.AppendElement(idxIter);
idxIter.swap(*_retval);
return NS_OK;
}
// static
nsresult
CacheIndex::IsUpToDate(bool *_retval)
{
LOG(("CacheIndex::IsUpToDate()"));
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!index->IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
*_retval = (index->mState == READY || index->mState == WRITING) &&
!index->mIndexNeedsUpdate && !index->mShuttingDown;
LOG(("CacheIndex::IsUpToDate() - returning %d", *_retval));
return NS_OK;
}
bool
CacheIndex::IsIndexUsable()
{
MOZ_ASSERT(mState != INITIAL);
switch (mState) {
case INITIAL:
case SHUTDOWN:
return false;
case READING:
case WRITING:
case BUILDING:
case UPDATING:
case READY:
break;
}
return true;
}
// static
bool
CacheIndex::IsCollision(CacheIndexEntry *aEntry,
OriginAttrsHash aOriginAttrsHash,
bool aAnonymous)
{
if (!aEntry->IsInitialized()) {
return false;
}
if (aEntry->Anonymous() != aAnonymous ||
aEntry->OriginAttrsHash() != aOriginAttrsHash) {
LOG(("CacheIndex::IsCollision() - Collision detected for entry hash=%08x"
"%08x%08x%08x%08x, expected values: originAttrsHash=%" PRIu64 ", "
"anonymous=%d; actual values: originAttrsHash=%" PRIu64 ", anonymous=%d]",
LOGSHA1(aEntry->Hash()), aOriginAttrsHash, aAnonymous,
aEntry->OriginAttrsHash(), aEntry->Anonymous()));
return true;
}
return false;
}
// static
bool
CacheIndex::HasEntryChanged(CacheIndexEntry *aEntry,
const uint32_t *aFrecency,
const uint32_t *aExpirationTime,
const bool *aHasAltData,
const uint16_t *aOnStartTime,
const uint16_t *aOnStopTime,
const uint32_t *aSize)
{
if (aFrecency && *aFrecency != aEntry->GetFrecency()) {
return true;
}
if (aExpirationTime && *aExpirationTime != aEntry->GetExpirationTime()) {
return true;
}
if (aHasAltData && *aHasAltData != aEntry->GetHasAltData()) {
return true;
}
if (aOnStartTime && *aOnStartTime != aEntry->GetOnStartTime()) {
return true;
}
if (aOnStopTime && *aOnStopTime != aEntry->GetOnStopTime()) {
return true;
}
if (aSize &&
(*aSize & CacheIndexEntry::kFileSizeMask) != aEntry->GetFileSize()) {
return true;
}
return false;
}
void
CacheIndex::ProcessPendingOperations()
{
LOG(("CacheIndex::ProcessPendingOperations()"));
sLock.AssertCurrentThreadOwns();
for (auto iter = mPendingUpdates.Iter(); !iter.Done(); iter.Next()) {
CacheIndexEntryUpdate* update = iter.Get();
LOG(("CacheIndex::ProcessPendingOperations() [hash=%08x%08x%08x%08x%08x]",
LOGSHA1(update->Hash())));
MOZ_ASSERT(update->IsFresh());
CacheIndexEntry* entry = mIndex.GetEntry(*update->Hash());
{
CacheIndexEntryAutoManage emng(update->Hash(), this);
emng.DoNotSearchInUpdates();
if (update->IsRemoved()) {
if (entry) {
if (entry->IsRemoved()) {
MOZ_ASSERT(entry->IsFresh());
MOZ_ASSERT(entry->IsDirty());
} else if (!entry->IsDirty() && entry->IsFileEmpty()) {
// Entries with empty file are not stored in index on disk. Just
// remove the entry, but only in case the entry is not dirty, i.e.
// the entry file was empty when we wrote the index.
mIndex.RemoveEntry(entry);
entry = nullptr;
} else {
entry->MarkRemoved();
entry->MarkDirty();
entry->MarkFresh();
}
}
} else if (entry) {
// Some information in mIndex can be newer than in mPendingUpdates (see
// bug 1074832). This will copy just those values that were really
// updated.
update->ApplyUpdate(entry);
} else {
// There is no entry in mIndex, copy all information from
// mPendingUpdates to mIndex.
entry = mIndex.PutEntry(*update->Hash());
*entry = *update;
}
}
iter.Remove();
}
MOZ_ASSERT(mPendingUpdates.Count() == 0);
EnsureCorrectStats();
}
bool
CacheIndex::WriteIndexToDiskIfNeeded()
{
if (mState != READY || mShuttingDown || mRWPending) {
return false;
}
if (!mLastDumpTime.IsNull() &&
(TimeStamp::NowLoRes() - mLastDumpTime).ToMilliseconds() <
kMinDumpInterval) {
return false;
}
if (mIndexStats.Dirty() < kMinUnwrittenChanges) {
return false;
}
WriteIndexToDisk();
return true;
}
void
CacheIndex::WriteIndexToDisk()
{
LOG(("CacheIndex::WriteIndexToDisk()"));
mIndexStats.Log();
nsresult rv;
sLock.AssertCurrentThreadOwns();
MOZ_ASSERT(mState == READY);
MOZ_ASSERT(!mRWBuf);
MOZ_ASSERT(!mRWHash);
MOZ_ASSERT(!mRWPending);
ChangeState(WRITING);
mProcessEntries = mIndexStats.ActiveEntriesCount();
mIndexFileOpener = new FileOpenHelper(this);
rv = CacheFileIOManager::OpenFile(NS_LITERAL_CSTRING(TEMP_INDEX_NAME),
CacheFileIOManager::SPECIAL_FILE |
CacheFileIOManager::CREATE,
mIndexFileOpener);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::WriteIndexToDisk() - Can't open file [rv=0x%08" PRIx32 "]",
static_cast<uint32_t>(rv)));
FinishWrite(false);
return;
}
// Write index header to a buffer, it will be written to disk together with
// records in WriteRecords() once we open the file successfully.
AllocBuffer();
mRWHash = new CacheHash();
mRWBufPos = 0;
// index version
NetworkEndian::writeUint32(mRWBuf + mRWBufPos, kIndexVersion);
mRWBufPos += sizeof(uint32_t);
// timestamp
NetworkEndian::writeUint32(mRWBuf + mRWBufPos,
static_cast<uint32_t>(PR_Now() / PR_USEC_PER_SEC));
mRWBufPos += sizeof(uint32_t);
// dirty flag
NetworkEndian::writeUint32(mRWBuf + mRWBufPos, 1);
mRWBufPos += sizeof(uint32_t);
mSkipEntries = 0;
}
void
CacheIndex::WriteRecords()
{
LOG(("CacheIndex::WriteRecords()"));
nsresult rv;
sLock.AssertCurrentThreadOwns();
MOZ_ASSERT(mState == WRITING);
MOZ_ASSERT(!mRWPending);
int64_t fileOffset;
if (mSkipEntries) {
MOZ_ASSERT(mRWBufPos == 0);
fileOffset = sizeof(CacheIndexHeader);
fileOffset += sizeof(CacheIndexRecord) * mSkipEntries;
} else {
MOZ_ASSERT(mRWBufPos == sizeof(CacheIndexHeader));
fileOffset = 0;
}
uint32_t hashOffset = mRWBufPos;
char* buf = mRWBuf + mRWBufPos;
uint32_t skip = mSkipEntries;
uint32_t processMax = (mRWBufSize - mRWBufPos) / sizeof(CacheIndexRecord);
MOZ_ASSERT(processMax != 0 || mProcessEntries == 0); // TODO make sure we can write an empty index
uint32_t processed = 0;
#ifdef DEBUG
bool hasMore = false;
#endif
for (auto iter = mIndex.Iter(); !iter.Done(); iter.Next()) {
CacheIndexEntry* entry = iter.Get();
if (entry->IsRemoved() ||
!entry->IsInitialized() ||
entry->IsFileEmpty()) {
continue;
}
if (skip) {
skip--;
continue;
}
if (processed == processMax) {
#ifdef DEBUG
hasMore = true;
#endif
break;
}
entry->WriteToBuf(buf);
buf += sizeof(CacheIndexRecord);
processed++;
}
MOZ_ASSERT(mRWBufPos != static_cast<uint32_t>(buf - mRWBuf) ||
mProcessEntries == 0);
mRWBufPos = buf - mRWBuf;
mSkipEntries += processed;
MOZ_ASSERT(mSkipEntries <= mProcessEntries);
mRWHash->Update(mRWBuf + hashOffset, mRWBufPos - hashOffset);
if (mSkipEntries == mProcessEntries) {
MOZ_ASSERT(!hasMore);
// We've processed all records
if (mRWBufPos + sizeof(CacheHash::Hash32_t) > mRWBufSize) {
// realloc buffer to spare another write cycle
mRWBufSize = mRWBufPos + sizeof(CacheHash::Hash32_t);
mRWBuf = static_cast<char *>(moz_xrealloc(mRWBuf, mRWBufSize));
}
NetworkEndian::writeUint32(mRWBuf + mRWBufPos, mRWHash->GetHash());
mRWBufPos += sizeof(CacheHash::Hash32_t);
} else {
MOZ_ASSERT(hasMore);
}
rv = CacheFileIOManager::Write(mIndexHandle, fileOffset, mRWBuf, mRWBufPos,
mSkipEntries == mProcessEntries, false, this);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::WriteRecords() - CacheFileIOManager::Write() failed "
"synchronously [rv=0x%08" PRIx32 "]", static_cast<uint32_t>(rv)));
FinishWrite(false);
} else {
mRWPending = true;
}
mRWBufPos = 0;
}
void
CacheIndex::FinishWrite(bool aSucceeded)
{
LOG(("CacheIndex::FinishWrite() [succeeded=%d]", aSucceeded));
MOZ_ASSERT((!aSucceeded && mState == SHUTDOWN) || mState == WRITING);
sLock.AssertCurrentThreadOwns();
// If there is write operation pending we must be cancelling writing of the
// index when shutting down or removing the whole index.
MOZ_ASSERT(!mRWPending || (!aSucceeded && (mShuttingDown || mRemovingAll)));
mIndexHandle = nullptr;
mRWHash = nullptr;
ReleaseBuffer();
if (aSucceeded) {
// Opening of the file must not be in progress if writing succeeded.
MOZ_ASSERT(!mIndexFileOpener);
for (auto iter = mIndex.Iter(); !iter.Done(); iter.Next()) {
CacheIndexEntry* entry = iter.Get();
bool remove = false;
{
CacheIndexEntryAutoManage emng(entry->Hash(), this);
if (entry->IsRemoved()) {
emng.DoNotSearchInIndex();
remove = true;
} else if (entry->IsDirty()) {
entry->ClearDirty();
}
}
if (remove) {
iter.Remove();
}
}
mIndexOnDiskIsValid = true;
} else {
if (mIndexFileOpener) {
// If opening of the file is still in progress (e.g. WRITE process was
// canceled by RemoveAll()) then we need to cancel the opener to make sure
// that OnFileOpenedInternal() won't be called.
mIndexFileOpener->Cancel();
mIndexFileOpener = nullptr;
}
}
ProcessPendingOperations();
mIndexStats.Log();
if (mState == WRITING) {
ChangeState(READY);
mLastDumpTime = TimeStamp::NowLoRes();
}
}
nsresult
CacheIndex::GetFile(const nsACString &aName, nsIFile **_retval)
{
nsresult rv;
nsCOMPtr<nsIFile> file;
rv = mCacheDirectory->Clone(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
rv = file->AppendNative(aName);
NS_ENSURE_SUCCESS(rv, rv);
file.swap(*_retval);
return NS_OK;
}
nsresult
CacheIndex::RemoveFile(const nsACString &aName)
{
MOZ_ASSERT(mState == SHUTDOWN);
nsresult rv;
nsCOMPtr<nsIFile> file;
rv = GetFile(aName, getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
bool exists;
rv = file->Exists(&exists);
NS_ENSURE_SUCCESS(rv, rv);
if (exists) {
rv = file->Remove(false);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::RemoveFile() - Cannot remove old entry file from disk."
"[name=%s]", PromiseFlatCString(aName).get()));
NS_WARNING("Cannot remove old entry file from the disk");
return rv;
}
}
return NS_OK;
}
void
CacheIndex::RemoveAllIndexFiles()
{
LOG(("CacheIndex::RemoveAllIndexFiles()"));
RemoveFile(NS_LITERAL_CSTRING(INDEX_NAME));
RemoveJournalAndTempFile();
}
void
CacheIndex::RemoveJournalAndTempFile()
{
LOG(("CacheIndex::RemoveJournalAndTempFile()"));
RemoveFile(NS_LITERAL_CSTRING(TEMP_INDEX_NAME));
RemoveFile(NS_LITERAL_CSTRING(JOURNAL_NAME));
}
class WriteLogHelper
{
public:
explicit WriteLogHelper(PRFileDesc *aFD)
: mFD(aFD)
, mBufSize(kMaxBufSize)
, mBufPos(0)
{
mHash = new CacheHash();
mBuf = static_cast<char *>(moz_xmalloc(mBufSize));
}
~WriteLogHelper() {
free(mBuf);
}
nsresult AddEntry(CacheIndexEntry *aEntry);
nsresult Finish();
private:
nsresult FlushBuffer();
PRFileDesc *mFD;
char *mBuf;
uint32_t mBufSize;
int32_t mBufPos;
RefPtr<CacheHash> mHash;
};
nsresult
WriteLogHelper::AddEntry(CacheIndexEntry *aEntry)
{
nsresult rv;
if (mBufPos + sizeof(CacheIndexRecord) > mBufSize) {
mHash->Update(mBuf, mBufPos);
rv = FlushBuffer();
NS_ENSURE_SUCCESS(rv, rv);
MOZ_ASSERT(mBufPos + sizeof(CacheIndexRecord) <= mBufSize);
}
aEntry->WriteToBuf(mBuf + mBufPos);
mBufPos += sizeof(CacheIndexRecord);
return NS_OK;
}
nsresult
WriteLogHelper::Finish()
{
nsresult rv;
mHash->Update(mBuf, mBufPos);
if (mBufPos + sizeof(CacheHash::Hash32_t) > mBufSize) {
rv = FlushBuffer();
NS_ENSURE_SUCCESS(rv, rv);
MOZ_ASSERT(mBufPos + sizeof(CacheHash::Hash32_t) <= mBufSize);
}
NetworkEndian::writeUint32(mBuf + mBufPos, mHash->GetHash());
mBufPos += sizeof(CacheHash::Hash32_t);
rv = FlushBuffer();
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
WriteLogHelper::FlushBuffer()
{
if (CacheObserver::IsPastShutdownIOLag()) {
LOG(("WriteLogHelper::FlushBuffer() - Interrupting writing journal."));
return NS_ERROR_FAILURE;
}
int32_t bytesWritten = PR_Write(mFD, mBuf, mBufPos);
if (bytesWritten != mBufPos) {
return NS_ERROR_FAILURE;
}
mBufPos = 0;
return NS_OK;
}
nsresult
CacheIndex::WriteLogToDisk()
{
LOG(("CacheIndex::WriteLogToDisk()"));
nsresult rv;
MOZ_ASSERT(mPendingUpdates.Count() == 0);
MOZ_ASSERT(mState == SHUTDOWN);
if (CacheObserver::IsPastShutdownIOLag()) {
LOG(("CacheIndex::WriteLogToDisk() - Skipping writing journal."));
return NS_ERROR_FAILURE;
}
RemoveFile(NS_LITERAL_CSTRING(TEMP_INDEX_NAME));
nsCOMPtr<nsIFile> indexFile;
rv = GetFile(NS_LITERAL_CSTRING(INDEX_NAME), getter_AddRefs(indexFile));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIFile> logFile;
rv = GetFile(NS_LITERAL_CSTRING(JOURNAL_NAME), getter_AddRefs(logFile));
NS_ENSURE_SUCCESS(rv, rv);
mIndexStats.Log();
PRFileDesc *fd = nullptr;
rv = logFile->OpenNSPRFileDesc(PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE,
0600, &fd);
NS_ENSURE_SUCCESS(rv, rv);
WriteLogHelper wlh(fd);
for (auto iter = mIndex.Iter(); !iter.Done(); iter.Next()) {
CacheIndexEntry* entry = iter.Get();
if (entry->IsRemoved() || entry->IsDirty()) {
rv = wlh.AddEntry(entry);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
}
rv = wlh.Finish();
PR_Close(fd);
NS_ENSURE_SUCCESS(rv, rv);
rv = indexFile->OpenNSPRFileDesc(PR_RDWR, 0600, &fd);
NS_ENSURE_SUCCESS(rv, rv);
// Seek to dirty flag in the index header and clear it.
static_assert(2 * sizeof(uint32_t) == offsetof(CacheIndexHeader, mIsDirty),
"Unexpected offset of CacheIndexHeader::mIsDirty");
int64_t offset = PR_Seek64(fd, 2 * sizeof(uint32_t), PR_SEEK_SET);
if (offset == -1) {
PR_Close(fd);
return NS_ERROR_FAILURE;
}
uint32_t isDirty = 0;
int32_t bytesWritten = PR_Write(fd, &isDirty, sizeof(isDirty));
PR_Close(fd);
if (bytesWritten != sizeof(isDirty)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
void
CacheIndex::ReadIndexFromDisk()
{
LOG(("CacheIndex::ReadIndexFromDisk()"));
nsresult rv;
sLock.AssertCurrentThreadOwns();
MOZ_ASSERT(mState == INITIAL);
ChangeState(READING);
mIndexFileOpener = new FileOpenHelper(this);
rv = CacheFileIOManager::OpenFile(NS_LITERAL_CSTRING(INDEX_NAME),
CacheFileIOManager::SPECIAL_FILE |
CacheFileIOManager::OPEN,
mIndexFileOpener);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::ReadIndexFromDisk() - CacheFileIOManager::OpenFile() "
"failed [rv=0x%08" PRIx32 ", file=%s]", static_cast<uint32_t>(rv), INDEX_NAME));
FinishRead(false);
return;
}
mJournalFileOpener = new FileOpenHelper(this);
rv = CacheFileIOManager::OpenFile(NS_LITERAL_CSTRING(JOURNAL_NAME),
CacheFileIOManager::SPECIAL_FILE |
CacheFileIOManager::OPEN,
mJournalFileOpener);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::ReadIndexFromDisk() - CacheFileIOManager::OpenFile() "
"failed [rv=0x%08" PRIx32 ", file=%s]", static_cast<uint32_t>(rv), JOURNAL_NAME));
FinishRead(false);
}
mTmpFileOpener = new FileOpenHelper(this);
rv = CacheFileIOManager::OpenFile(NS_LITERAL_CSTRING(TEMP_INDEX_NAME),
CacheFileIOManager::SPECIAL_FILE |
CacheFileIOManager::OPEN,
mTmpFileOpener);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::ReadIndexFromDisk() - CacheFileIOManager::OpenFile() "
"failed [rv=0x%08" PRIx32 ", file=%s]", static_cast<uint32_t>(rv),
TEMP_INDEX_NAME));
FinishRead(false);
}
}
void
CacheIndex::StartReadingIndex()
{
LOG(("CacheIndex::StartReadingIndex()"));
nsresult rv;
sLock.AssertCurrentThreadOwns();
MOZ_ASSERT(mIndexHandle);
MOZ_ASSERT(mState == READING);
MOZ_ASSERT(!mIndexOnDiskIsValid);
MOZ_ASSERT(!mDontMarkIndexClean);
MOZ_ASSERT(!mJournalReadSuccessfully);
MOZ_ASSERT(mIndexHandle->FileSize() >= 0);
MOZ_ASSERT(!mRWPending);
int64_t entriesSize = mIndexHandle->FileSize() - sizeof(CacheIndexHeader) -
sizeof(CacheHash::Hash32_t);
if (entriesSize < 0 || entriesSize % sizeof(CacheIndexRecord)) {
LOG(("CacheIndex::StartReadingIndex() - Index is corrupted"));
FinishRead(false);
return;
}
AllocBuffer();
mSkipEntries = 0;
mRWHash = new CacheHash();
mRWBufPos = std::min(mRWBufSize,
static_cast<uint32_t>(mIndexHandle->FileSize()));
rv = CacheFileIOManager::Read(mIndexHandle, 0, mRWBuf, mRWBufPos, this);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::StartReadingIndex() - CacheFileIOManager::Read() failed "
"synchronously [rv=0x%08" PRIx32 "]", static_cast<uint32_t>(rv)));
FinishRead(false);
} else {
mRWPending = true;
}
}
void
CacheIndex::ParseRecords()
{
LOG(("CacheIndex::ParseRecords()"));
nsresult rv;
sLock.AssertCurrentThreadOwns();
MOZ_ASSERT(!mRWPending);
uint32_t entryCnt = (mIndexHandle->FileSize() - sizeof(CacheIndexHeader) -
sizeof(CacheHash::Hash32_t)) / sizeof(CacheIndexRecord);
uint32_t pos = 0;
if (!mSkipEntries) {
if (NetworkEndian::readUint32(mRWBuf + pos) != kIndexVersion) {
FinishRead(false);
return;
}
pos += sizeof(uint32_t);
mIndexTimeStamp = NetworkEndian::readUint32(mRWBuf + pos);
pos += sizeof(uint32_t);
if (NetworkEndian::readUint32(mRWBuf + pos)) {
if (mJournalHandle) {
CacheFileIOManager::DoomFile(mJournalHandle, nullptr);
mJournalHandle = nullptr;
}
} else {
uint32_t * isDirty = reinterpret_cast<uint32_t *>(
moz_xmalloc(sizeof(uint32_t)));
NetworkEndian::writeUint32(isDirty, 1);
// Mark index dirty. The buffer is freed by CacheFileIOManager when
// nullptr is passed as the listener and the call doesn't fail
// synchronously.
rv = CacheFileIOManager::Write(mIndexHandle, 2 * sizeof(uint32_t),
reinterpret_cast<char *>(isDirty),
sizeof(uint32_t), true, false, nullptr);
if (NS_FAILED(rv)) {
// This is not fatal, just free the memory
free(isDirty);
}
}
pos += sizeof(uint32_t);
}
uint32_t hashOffset = pos;
while (pos + sizeof(CacheIndexRecord) <= mRWBufPos &&
mSkipEntries != entryCnt) {
CacheIndexRecord *rec = reinterpret_cast<CacheIndexRecord *>(mRWBuf + pos);
CacheIndexEntry tmpEntry(&rec->mHash);
tmpEntry.ReadFromBuf(mRWBuf + pos);
if (tmpEntry.IsDirty() || !tmpEntry.IsInitialized() ||
tmpEntry.IsFileEmpty() || tmpEntry.IsFresh() || tmpEntry.IsRemoved()) {
LOG(("CacheIndex::ParseRecords() - Invalid entry found in index, removing"
" whole index [dirty=%d, initialized=%d, fileEmpty=%d, fresh=%d, "
"removed=%d]", tmpEntry.IsDirty(), tmpEntry.IsInitialized(),
tmpEntry.IsFileEmpty(), tmpEntry.IsFresh(), tmpEntry.IsRemoved()));
FinishRead(false);
return;
}
CacheIndexEntryAutoManage emng(tmpEntry.Hash(), this);
CacheIndexEntry *entry = mIndex.PutEntry(*tmpEntry.Hash());
*entry = tmpEntry;
pos += sizeof(CacheIndexRecord);
mSkipEntries++;
}
mRWHash->Update(mRWBuf + hashOffset, pos - hashOffset);
if (pos != mRWBufPos) {
memmove(mRWBuf, mRWBuf + pos, mRWBufPos - pos);
}
mRWBufPos -= pos;
pos = 0;
int64_t fileOffset = sizeof(CacheIndexHeader) +
mSkipEntries * sizeof(CacheIndexRecord) + mRWBufPos;
MOZ_ASSERT(fileOffset <= mIndexHandle->FileSize());
if (fileOffset == mIndexHandle->FileSize()) {
uint32_t expectedHash = NetworkEndian::readUint32(mRWBuf);
if (mRWHash->GetHash() != expectedHash) {
LOG(("CacheIndex::ParseRecords() - Hash mismatch, [is %x, should be %x]",
mRWHash->GetHash(), expectedHash));
FinishRead(false);
return;
}
mIndexOnDiskIsValid = true;
mJournalReadSuccessfully = false;
if (mJournalHandle) {
StartReadingJournal();
} else {
FinishRead(false);
}
return;
}
pos = mRWBufPos;
uint32_t toRead = std::min(mRWBufSize - pos,
static_cast<uint32_t>(mIndexHandle->FileSize() -
fileOffset));
mRWBufPos = pos + toRead;
rv = CacheFileIOManager::Read(mIndexHandle, fileOffset, mRWBuf + pos, toRead,
this);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::ParseRecords() - CacheFileIOManager::Read() failed "
"synchronously [rv=0x%08" PRIx32 "]", static_cast<uint32_t>(rv)));
FinishRead(false);
return;
}
mRWPending = true;
}
void
CacheIndex::StartReadingJournal()
{
LOG(("CacheIndex::StartReadingJournal()"));
nsresult rv;
sLock.AssertCurrentThreadOwns();
MOZ_ASSERT(mJournalHandle);
MOZ_ASSERT(mIndexOnDiskIsValid);
MOZ_ASSERT(mTmpJournal.Count() == 0);
MOZ_ASSERT(mJournalHandle->FileSize() >= 0);
MOZ_ASSERT(!mRWPending);
int64_t entriesSize = mJournalHandle->FileSize() -
sizeof(CacheHash::Hash32_t);
if (entriesSize < 0 || entriesSize % sizeof(CacheIndexRecord)) {
LOG(("CacheIndex::StartReadingJournal() - Journal is corrupted"));
FinishRead(false);
return;
}
mSkipEntries = 0;
mRWHash = new CacheHash();
mRWBufPos = std::min(mRWBufSize,
static_cast<uint32_t>(mJournalHandle->FileSize()));
rv = CacheFileIOManager::Read(mJournalHandle, 0, mRWBuf, mRWBufPos, this);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::StartReadingJournal() - CacheFileIOManager::Read() failed"
" synchronously [rv=0x%08" PRIx32 "]", static_cast<uint32_t>(rv)));
FinishRead(false);
} else {
mRWPending = true;
}
}
void
CacheIndex::ParseJournal()
{
LOG(("CacheIndex::ParseJournal()"));
nsresult rv;
sLock.AssertCurrentThreadOwns();
MOZ_ASSERT(!mRWPending);
uint32_t entryCnt = (mJournalHandle->FileSize() -
sizeof(CacheHash::Hash32_t)) / sizeof(CacheIndexRecord);
uint32_t pos = 0;
while (pos + sizeof(CacheIndexRecord) <= mRWBufPos &&
mSkipEntries != entryCnt) {
CacheIndexEntry tmpEntry(reinterpret_cast<SHA1Sum::Hash *>(mRWBuf + pos));
tmpEntry.ReadFromBuf(mRWBuf + pos);
CacheIndexEntry *entry = mTmpJournal.PutEntry(*tmpEntry.Hash());
*entry = tmpEntry;
if (entry->IsDirty() || entry->IsFresh()) {
LOG(("CacheIndex::ParseJournal() - Invalid entry found in journal, "
"ignoring whole journal [dirty=%d, fresh=%d]", entry->IsDirty(),
entry->IsFresh()));
FinishRead(false);
return;
}
pos += sizeof(CacheIndexRecord);
mSkipEntries++;
}
mRWHash->Update(mRWBuf, pos);
if (pos != mRWBufPos) {
memmove(mRWBuf, mRWBuf + pos, mRWBufPos - pos);
}
mRWBufPos -= pos;
pos = 0;
int64_t fileOffset = mSkipEntries * sizeof(CacheIndexRecord) + mRWBufPos;
MOZ_ASSERT(fileOffset <= mJournalHandle->FileSize());
if (fileOffset == mJournalHandle->FileSize()) {
uint32_t expectedHash = NetworkEndian::readUint32(mRWBuf);
if (mRWHash->GetHash() != expectedHash) {
LOG(("CacheIndex::ParseJournal() - Hash mismatch, [is %x, should be %x]",
mRWHash->GetHash(), expectedHash));
FinishRead(false);
return;
}
mJournalReadSuccessfully = true;
FinishRead(true);
return;
}
pos = mRWBufPos;
uint32_t toRead = std::min(mRWBufSize - pos,
static_cast<uint32_t>(mJournalHandle->FileSize() -
fileOffset));
mRWBufPos = pos + toRead;
rv = CacheFileIOManager::Read(mJournalHandle, fileOffset, mRWBuf + pos,
toRead, this);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::ParseJournal() - CacheFileIOManager::Read() failed "
"synchronously [rv=0x%08" PRIx32 "]", static_cast<uint32_t>(rv)));
FinishRead(false);
return;
}
mRWPending = true;
}
void
CacheIndex::MergeJournal()
{
LOG(("CacheIndex::MergeJournal()"));
sLock.AssertCurrentThreadOwns();
for (auto iter = mTmpJournal.Iter(); !iter.Done(); iter.Next()) {
CacheIndexEntry* entry = iter.Get();
LOG(("CacheIndex::MergeJournal() [hash=%08x%08x%08x%08x%08x]",
LOGSHA1(entry->Hash())));
CacheIndexEntry* entry2 = mIndex.GetEntry(*entry->Hash());
{
CacheIndexEntryAutoManage emng(entry->Hash(), this);
if (entry->IsRemoved()) {
if (entry2) {
entry2->MarkRemoved();
entry2->MarkDirty();
}
} else {
if (!entry2) {
entry2 = mIndex.PutEntry(*entry->Hash());
}
*entry2 = *entry;
entry2->MarkDirty();
}
}
iter.Remove();
}
MOZ_ASSERT(mTmpJournal.Count() == 0);
}
void
CacheIndex::EnsureNoFreshEntry()
{
#ifdef DEBUG_STATS
CacheIndexStats debugStats;
debugStats.DisableLogging();
for (auto iter = mIndex.Iter(); !iter.Done(); iter.Next()) {
debugStats.BeforeChange(nullptr);
debugStats.AfterChange(iter.Get());
}
MOZ_ASSERT(debugStats.Fresh() == 0);
#endif
}
void
CacheIndex::EnsureCorrectStats()
{
#ifdef DEBUG_STATS
MOZ_ASSERT(mPendingUpdates.Count() == 0);
CacheIndexStats debugStats;
debugStats.DisableLogging();
for (auto iter = mIndex.Iter(); !iter.Done(); iter.Next()) {
debugStats.BeforeChange(nullptr);
debugStats.AfterChange(iter.Get());
}
MOZ_ASSERT(debugStats == mIndexStats);
#endif
}
void
CacheIndex::FinishRead(bool aSucceeded)
{
LOG(("CacheIndex::FinishRead() [succeeded=%d]", aSucceeded));
sLock.AssertCurrentThreadOwns();
MOZ_ASSERT((!aSucceeded && mState == SHUTDOWN) || mState == READING);
MOZ_ASSERT(
// -> rebuild
(!aSucceeded && !mIndexOnDiskIsValid && !mJournalReadSuccessfully) ||
// -> update
(!aSucceeded && mIndexOnDiskIsValid && !mJournalReadSuccessfully) ||
// -> ready
(aSucceeded && mIndexOnDiskIsValid && mJournalReadSuccessfully));
// If there is read operation pending we must be cancelling reading of the
// index when shutting down or removing the whole index.
MOZ_ASSERT(!mRWPending || (!aSucceeded && (mShuttingDown || mRemovingAll)));
if (mState == SHUTDOWN) {
RemoveFile(NS_LITERAL_CSTRING(TEMP_INDEX_NAME));
RemoveFile(NS_LITERAL_CSTRING(JOURNAL_NAME));
} else {
if (mIndexHandle && !mIndexOnDiskIsValid) {
CacheFileIOManager::DoomFile(mIndexHandle, nullptr);
}
if (mJournalHandle) {
CacheFileIOManager::DoomFile(mJournalHandle, nullptr);
}
}
if (mIndexFileOpener) {
mIndexFileOpener->Cancel();
mIndexFileOpener = nullptr;
}
if (mJournalFileOpener) {
mJournalFileOpener->Cancel();
mJournalFileOpener = nullptr;
}
if (mTmpFileOpener) {
mTmpFileOpener->Cancel();
mTmpFileOpener = nullptr;
}
mIndexHandle = nullptr;
mJournalHandle = nullptr;
mRWHash = nullptr;
ReleaseBuffer();
if (mState == SHUTDOWN) {
return;
}
if (!mIndexOnDiskIsValid) {
MOZ_ASSERT(mTmpJournal.Count() == 0);
EnsureNoFreshEntry();
ProcessPendingOperations();
// Remove all entries that we haven't seen during this session
RemoveNonFreshEntries();
StartUpdatingIndex(true);
return;
}
if (!mJournalReadSuccessfully) {
mTmpJournal.Clear();
EnsureNoFreshEntry();
ProcessPendingOperations();
StartUpdatingIndex(false);
return;
}
MergeJournal();
EnsureNoFreshEntry();
ProcessPendingOperations();
mIndexStats.Log();
ChangeState(READY);
mLastDumpTime = TimeStamp::NowLoRes(); // Do not dump new index immediately
}
// static
void
CacheIndex::DelayedUpdate(nsITimer *aTimer, void *aClosure)
{
LOG(("CacheIndex::DelayedUpdate()"));
StaticMutexAutoLock lock(sLock);
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return;
}
index->DelayedUpdateLocked();
}
// static
void
CacheIndex::DelayedUpdateLocked()
{
LOG(("CacheIndex::DelayedUpdateLocked()"));
sLock.AssertCurrentThreadOwns();
nsresult rv;
mUpdateTimer = nullptr;
if (!IsIndexUsable()) {
return;
}
if (mState == READY && mShuttingDown) {
return;
}
// mUpdateEventPending must be false here since StartUpdatingIndex() won't
// schedule timer if it is true.
MOZ_ASSERT(!mUpdateEventPending);
if (mState != BUILDING && mState != UPDATING) {
LOG(("CacheIndex::DelayedUpdateLocked() - Update was canceled"));
return;
}
// We need to redispatch to run with lower priority
RefPtr<CacheIOThread> ioThread = CacheFileIOManager::IOThread();
MOZ_ASSERT(ioThread);
mUpdateEventPending = true;
rv = ioThread->Dispatch(this, CacheIOThread::INDEX);
if (NS_FAILED(rv)) {
mUpdateEventPending = false;
NS_WARNING("CacheIndex::DelayedUpdateLocked() - Can't dispatch event");
LOG(("CacheIndex::DelayedUpdate() - Can't dispatch event" ));
FinishUpdate(false);
}
}
nsresult
CacheIndex::ScheduleUpdateTimer(uint32_t aDelay)
{
LOG(("CacheIndex::ScheduleUpdateTimer() [delay=%u]", aDelay));
MOZ_ASSERT(!mUpdateTimer);
nsCOMPtr<nsIEventTarget> ioTarget = CacheFileIOManager::IOTarget();
MOZ_ASSERT(ioTarget);
return NS_NewTimerWithFuncCallback(getter_AddRefs(mUpdateTimer),
CacheIndex::DelayedUpdate,
nullptr,
aDelay,
nsITimer::TYPE_ONE_SHOT,
"net::CacheIndex::ScheduleUpdateTimer",
ioTarget);
}
nsresult
CacheIndex::SetupDirectoryEnumerator()
{
MOZ_ASSERT(!NS_IsMainThread());
MOZ_ASSERT(!mDirEnumerator);
nsresult rv;
nsCOMPtr<nsIFile> file;
rv = mCacheDirectory->Clone(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
rv = file->AppendNative(NS_LITERAL_CSTRING(ENTRIES_DIR));
NS_ENSURE_SUCCESS(rv, rv);
bool exists;
rv = file->Exists(&exists);
NS_ENSURE_SUCCESS(rv, rv);
if (!exists) {
NS_WARNING("CacheIndex::SetupDirectoryEnumerator() - Entries directory "
"doesn't exist!");
LOG(("CacheIndex::SetupDirectoryEnumerator() - Entries directory doesn't "
"exist!" ));
return NS_ERROR_UNEXPECTED;
}
rv = file->GetDirectoryEntries(getter_AddRefs(mDirEnumerator));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
CacheIndex::InitEntryFromDiskData(CacheIndexEntry *aEntry,
CacheFileMetadata *aMetaData,
int64_t aFileSize)
{
aEntry->InitNew();
aEntry->MarkDirty();
aEntry->MarkFresh();
aEntry->Init(GetOriginAttrsHash(aMetaData->OriginAttributes()),
aMetaData->IsAnonymous(),
aMetaData->Pinned());
uint32_t expirationTime;
aMetaData->GetExpirationTime(&expirationTime);
aEntry->SetExpirationTime(expirationTime);
uint32_t frecency;
aMetaData->GetFrecency(&frecency);
aEntry->SetFrecency(frecency);
const char *altData = aMetaData->GetElement(CacheFileUtils::kAltDataKey);
bool hasAltData = altData ? true : false;
if (hasAltData &&
NS_FAILED(CacheFileUtils::ParseAlternativeDataInfo(altData, nullptr, nullptr))) {
return NS_ERROR_FAILURE;
}
aEntry->SetHasAltData(hasAltData);
static auto toUint16 = [](const char *aUint16String) -> uint16_t {
if (!aUint16String) {
return kIndexTimeNotAvailable;
}
nsresult rv;
uint64_t n64 = nsDependentCString(aUint16String).ToInteger64(&rv);
MOZ_ASSERT(NS_SUCCEEDED(rv));
return n64 <= kIndexTimeOutOfBound ? n64 : kIndexTimeOutOfBound;
};
aEntry->SetOnStartTime(toUint16(aMetaData->GetElement("net-response-time-onstart")));
aEntry->SetOnStopTime(toUint16(aMetaData->GetElement("net-response-time-onstop")));
aEntry->SetFileSize(static_cast<uint32_t>(
std::min(static_cast<int64_t>(PR_UINT32_MAX),
(aFileSize + 0x3FF) >> 10)));
return NS_OK;
}
bool
CacheIndex::IsUpdatePending()
{
sLock.AssertCurrentThreadOwns();
if (mUpdateTimer || mUpdateEventPending) {
return true;
}
return false;
}
void
CacheIndex::BuildIndex()
{
LOG(("CacheIndex::BuildIndex()"));
sLock.AssertCurrentThreadOwns();
MOZ_ASSERT(mPendingUpdates.Count() == 0);
nsresult rv;
if (!mDirEnumerator) {
{
// Do not do IO under the lock.
StaticMutexAutoUnlock unlock(sLock);
rv = SetupDirectoryEnumerator();
}
if (mState == SHUTDOWN) {
// The index was shut down while we released the lock. FinishUpdate() was
// already called from Shutdown(), so just simply return here.
return;
}
if (NS_FAILED(rv)) {
FinishUpdate(false);
return;
}
}
while (true) {
if (CacheIOThread::YieldAndRerun()) {
LOG(("CacheIndex::BuildIndex() - Breaking loop for higher level events."));
mUpdateEventPending = true;
return;
}
bool fileExists = false;
nsCOMPtr<nsIFile> file;
{
// Do not do IO under the lock.
StaticMutexAutoUnlock unlock(sLock);
rv = mDirEnumerator->GetNextFile(getter_AddRefs(file));
if (file) {
file->Exists(&fileExists);
}
}
if (mState == SHUTDOWN) {
return;
}
if (!file) {
FinishUpdate(NS_SUCCEEDED(rv));
return;
}
nsAutoCString leaf;
rv = file->GetNativeLeafName(leaf);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::BuildIndex() - GetNativeLeafName() failed! Skipping "
"file."));
mDontMarkIndexClean = true;
continue;
}
if (!fileExists) {
LOG(("CacheIndex::BuildIndex() - File returned by the iterator was "
"removed in the meantime [name=%s]", leaf.get()));
continue;
}
SHA1Sum::Hash hash;
rv = CacheFileIOManager::StrToHash(leaf, &hash);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::BuildIndex() - Filename is not a hash, removing file. "
"[name=%s]", leaf.get()));
file->Remove(false);
continue;
}
CacheIndexEntry *entry = mIndex.GetEntry(hash);
if (entry && entry->IsRemoved()) {
LOG(("CacheIndex::BuildIndex() - Found file that should not exist. "
"[name=%s]", leaf.get()));
entry->Log();
MOZ_ASSERT(entry->IsFresh());
entry = nullptr;
}
#ifdef DEBUG
RefPtr<CacheFileHandle> handle;
CacheFileIOManager::gInstance->mHandles.GetHandle(&hash,
getter_AddRefs(handle));
#endif
if (entry) {
// the entry is up to date
LOG(("CacheIndex::BuildIndex() - Skipping file because the entry is up to"
" date. [name=%s]", leaf.get()));
entry->Log();
MOZ_ASSERT(entry->IsFresh()); // The entry must be from this session
// there must be an active CacheFile if the entry is not initialized
MOZ_ASSERT(entry->IsInitialized() || handle);
continue;
}
MOZ_ASSERT(!handle);
RefPtr<CacheFileMetadata> meta = new CacheFileMetadata();
int64_t size = 0;
{
// Do not do IO under the lock.
StaticMutexAutoUnlock unlock(sLock);
rv = meta->SyncReadMetadata(file);
if (NS_SUCCEEDED(rv)) {
rv = file->GetFileSize(&size);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::BuildIndex() - Cannot get filesize of file that was"
" successfully parsed. [name=%s]", leaf.get()));
}
}
}
if (mState == SHUTDOWN) {
return;
}
// Nobody could add the entry while the lock was released since we modify
// the index only on IO thread and this loop is executed on IO thread too.
entry = mIndex.GetEntry(hash);
MOZ_ASSERT(!entry || entry->IsRemoved());
if (NS_FAILED(rv)) {
LOG(("CacheIndex::BuildIndex() - CacheFileMetadata::SyncReadMetadata() "
"failed, removing file. [name=%s]", leaf.get()));
file->Remove(false);
} else {
CacheIndexEntryAutoManage entryMng(&hash, this);
entry = mIndex.PutEntry(hash);
if (NS_FAILED(InitEntryFromDiskData(entry, meta, size))) {
LOG(("CacheIndex::BuildIndex() - CacheFile::InitEntryFromDiskData() "
"failed, removing file. [name=%s]", leaf.get()));
file->Remove(false);
entry->MarkRemoved();
} else {
LOG(("CacheIndex::BuildIndex() - Added entry to index. [name=%s]",
leaf.get()));
entry->Log();
}
}
}
MOZ_ASSERT_UNREACHABLE("We should never get here");
}
bool
CacheIndex::StartUpdatingIndexIfNeeded(bool aSwitchingToReadyState)
{
// Start updating process when we are in or we are switching to READY state
// and index needs update, but not during shutdown or when removing all
// entries.
if ((mState == READY || aSwitchingToReadyState) && mIndexNeedsUpdate &&
!mShuttingDown && !mRemovingAll) {
LOG(("CacheIndex::StartUpdatingIndexIfNeeded() - starting update process"));
mIndexNeedsUpdate = false;
StartUpdatingIndex(false);
return true;
}
return false;
}
void
CacheIndex::StartUpdatingIndex(bool aRebuild)
{
LOG(("CacheIndex::StartUpdatingIndex() [rebuild=%d]", aRebuild));
sLock.AssertCurrentThreadOwns();
nsresult rv;
mIndexStats.Log();
ChangeState(aRebuild ? BUILDING : UPDATING);
mDontMarkIndexClean = false;
if (mShuttingDown || mRemovingAll) {
FinishUpdate(false);
return;
}
if (IsUpdatePending()) {
LOG(("CacheIndex::StartUpdatingIndex() - Update is already pending"));
return;
}
uint32_t elapsed = (TimeStamp::NowLoRes() - mStartTime).ToMilliseconds();
if (elapsed < kUpdateIndexStartDelay) {
LOG(("CacheIndex::StartUpdatingIndex() - %u ms elapsed since startup, "
"scheduling timer to fire in %u ms.", elapsed,
kUpdateIndexStartDelay - elapsed));
rv = ScheduleUpdateTimer(kUpdateIndexStartDelay - elapsed);
if (NS_SUCCEEDED(rv)) {
return;
}
LOG(("CacheIndex::StartUpdatingIndex() - ScheduleUpdateTimer() failed. "
"Starting update immediately."));
} else {
LOG(("CacheIndex::StartUpdatingIndex() - %u ms elapsed since startup, "
"starting update now.", elapsed));
}
RefPtr<CacheIOThread> ioThread = CacheFileIOManager::IOThread();
MOZ_ASSERT(ioThread);
// We need to dispatch an event even if we are on IO thread since we need to
// update the index with the correct priority.
mUpdateEventPending = true;
rv = ioThread->Dispatch(this, CacheIOThread::INDEX);
if (NS_FAILED(rv)) {
mUpdateEventPending = false;
NS_WARNING("CacheIndex::StartUpdatingIndex() - Can't dispatch event");
LOG(("CacheIndex::StartUpdatingIndex() - Can't dispatch event" ));
FinishUpdate(false);
}
}
void
CacheIndex::UpdateIndex()
{
LOG(("CacheIndex::UpdateIndex()"));
sLock.AssertCurrentThreadOwns();
MOZ_ASSERT(mPendingUpdates.Count() == 0);
nsresult rv;
if (!mDirEnumerator) {
{
// Do not do IO under the lock.
StaticMutexAutoUnlock unlock(sLock);
rv = SetupDirectoryEnumerator();
}
if (mState == SHUTDOWN) {
// The index was shut down while we released the lock. FinishUpdate() was
// already called from Shutdown(), so just simply return here.
return;
}
if (NS_FAILED(rv)) {
FinishUpdate(false);
return;
}
}
while (true) {
if (CacheIOThread::YieldAndRerun()) {
LOG(("CacheIndex::UpdateIndex() - Breaking loop for higher level "
"events."));
mUpdateEventPending = true;
return;
}
bool fileExists = false;
nsCOMPtr<nsIFile> file;
{
// Do not do IO under the lock.
StaticMutexAutoUnlock unlock(sLock);
rv = mDirEnumerator->GetNextFile(getter_AddRefs(file));
if (file) {
file->Exists(&fileExists);
}
}
if (mState == SHUTDOWN) {
return;
}
if (!file) {
FinishUpdate(NS_SUCCEEDED(rv));
return;
}
nsAutoCString leaf;
rv = file->GetNativeLeafName(leaf);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::UpdateIndex() - GetNativeLeafName() failed! Skipping "
"file."));
mDontMarkIndexClean = true;
continue;
}
if (!fileExists) {
LOG(("CacheIndex::UpdateIndex() - File returned by the iterator was "
"removed in the meantime [name=%s]", leaf.get()));
continue;
}
SHA1Sum::Hash hash;
rv = CacheFileIOManager::StrToHash(leaf, &hash);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::UpdateIndex() - Filename is not a hash, removing file. "
"[name=%s]", leaf.get()));
file->Remove(false);
continue;
}
CacheIndexEntry *entry = mIndex.GetEntry(hash);
if (entry && entry->IsRemoved()) {
if (entry->IsFresh()) {
LOG(("CacheIndex::UpdateIndex() - Found file that should not exist. "
"[name=%s]", leaf.get()));
entry->Log();
}
entry = nullptr;
}
#ifdef DEBUG
RefPtr<CacheFileHandle> handle;
CacheFileIOManager::gInstance->mHandles.GetHandle(&hash,
getter_AddRefs(handle));
#endif
if (entry && entry->IsFresh()) {
// the entry is up to date
LOG(("CacheIndex::UpdateIndex() - Skipping file because the entry is up "
" to date. [name=%s]", leaf.get()));
entry->Log();
// there must be an active CacheFile if the entry is not initialized
MOZ_ASSERT(entry->IsInitialized() || handle);
continue;
}
MOZ_ASSERT(!handle);
if (entry) {
PRTime lastModifiedTime;
{
// Do not do IO under the lock.
StaticMutexAutoUnlock unlock(sLock);
rv = file->GetLastModifiedTime(&lastModifiedTime);
}
if (mState == SHUTDOWN) {
return;
}
if (NS_FAILED(rv)) {
LOG(("CacheIndex::UpdateIndex() - Cannot get lastModifiedTime. "
"[name=%s]", leaf.get()));
// Assume the file is newer than index
} else {
if (mIndexTimeStamp > (lastModifiedTime / PR_MSEC_PER_SEC)) {
LOG(("CacheIndex::UpdateIndex() - Skipping file because of last "
"modified time. [name=%s, indexTimeStamp=%" PRIu32 ", "
"lastModifiedTime=%" PRId64 "]", leaf.get(), mIndexTimeStamp,
lastModifiedTime / PR_MSEC_PER_SEC));
CacheIndexEntryAutoManage entryMng(&hash, this);
entry->MarkFresh();
continue;
}
}
}
RefPtr<CacheFileMetadata> meta = new CacheFileMetadata();
int64_t size = 0;
{
// Do not do IO under the lock.
StaticMutexAutoUnlock unlock(sLock);
rv = meta->SyncReadMetadata(file);
if (NS_SUCCEEDED(rv)) {
rv = file->GetFileSize(&size);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::UpdateIndex() - Cannot get filesize of file that "
"was successfully parsed. [name=%s]", leaf.get()));
}
}
}
if (mState == SHUTDOWN) {
return;
}
// Nobody could add the entry while the lock was released since we modify
// the index only on IO thread and this loop is executed on IO thread too.
entry = mIndex.GetEntry(hash);
MOZ_ASSERT(!entry || !entry->IsFresh());
CacheIndexEntryAutoManage entryMng(&hash, this);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::UpdateIndex() - CacheFileMetadata::SyncReadMetadata() "
"failed, removing file. [name=%s]", leaf.get()));
} else {
entry = mIndex.PutEntry(hash);
rv = InitEntryFromDiskData(entry, meta, size);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::UpdateIndex() - CacheIndex::InitEntryFromDiskData "
"failed, removing file. [name=%s]", leaf.get()));
}
}
if (NS_FAILED(rv)) {
file->Remove(false);
if (entry) {
entry->MarkRemoved();
entry->MarkFresh();
entry->MarkDirty();
}
} else {
LOG(("CacheIndex::UpdateIndex() - Added/updated entry to/in index. "
"[name=%s]", leaf.get()));
entry->Log();
}
}
MOZ_ASSERT_UNREACHABLE("We should never get here");
}
void
CacheIndex::FinishUpdate(bool aSucceeded)
{
LOG(("CacheIndex::FinishUpdate() [succeeded=%d]", aSucceeded));
MOZ_ASSERT(mState == UPDATING || mState == BUILDING ||
(!aSucceeded && mState == SHUTDOWN));
sLock.AssertCurrentThreadOwns();
if (mDirEnumerator) {
if (NS_IsMainThread()) {
LOG(("CacheIndex::FinishUpdate() - posting of PreShutdownInternal failed?"
" Cannot safely release mDirEnumerator, leaking it!"));
NS_WARNING(("CacheIndex::FinishUpdate() - Leaking mDirEnumerator!"));
// This can happen only in case dispatching event to IO thread failed in
// CacheIndex::PreShutdown().
Unused << mDirEnumerator.forget(); // Leak it since dir enumerator is not threadsafe
} else {
mDirEnumerator->Close();
mDirEnumerator = nullptr;
}
}
if (!aSucceeded) {
mDontMarkIndexClean = true;
}
if (mState == SHUTDOWN) {
return;
}
if (mState == UPDATING && aSucceeded) {
// If we've iterated over all entries successfully then all entries that
// really exist on the disk are now marked as fresh. All non-fresh entries
// don't exist anymore and must be removed from the index.
RemoveNonFreshEntries();
}
// Make sure we won't start update. If the build or update failed, there is no
// reason to believe that it will succeed next time.
mIndexNeedsUpdate = false;
ChangeState(READY);
mLastDumpTime = TimeStamp::NowLoRes(); // Do not dump new index immediately
}
void
CacheIndex::RemoveNonFreshEntries()
{
for (auto iter = mIndex.Iter(); !iter.Done(); iter.Next()) {
CacheIndexEntry* entry = iter.Get();
if (entry->IsFresh()) {
continue;
}
LOG(("CacheIndex::RemoveNonFreshEntries() - Removing entry. "
"[hash=%08x%08x%08x%08x%08x]", LOGSHA1(entry->Hash())));
{
CacheIndexEntryAutoManage emng(entry->Hash(), this);
emng.DoNotSearchInIndex();
}
iter.Remove();
}
}
// static
char const *
CacheIndex::StateString(EState aState)
{
switch (aState) {
case INITIAL: return "INITIAL";
case READING: return "READING";
case WRITING: return "WRITING";
case BUILDING: return "BUILDING";
case UPDATING: return "UPDATING";
case READY: return "READY";
case SHUTDOWN: return "SHUTDOWN";
}
MOZ_ASSERT(false, "Unexpected state!");
return "?";
}
void
CacheIndex::ChangeState(EState aNewState)
{
LOG(("CacheIndex::ChangeState() changing state %s -> %s", StateString(mState),
StateString(aNewState)));
// All pending updates should be processed before changing state
MOZ_ASSERT(mPendingUpdates.Count() == 0);
// PreShutdownInternal() should change the state to READY from every state. It
// may go through different states, but once we are in READY state the only
// possible transition is to SHUTDOWN state.
MOZ_ASSERT(!mShuttingDown || mState != READY || aNewState == SHUTDOWN);
// Start updating process when switching to READY state if needed
if (aNewState == READY && StartUpdatingIndexIfNeeded(true)) {
return;
}
if ((mState == READING || mState == BUILDING || mState == UPDATING) &&
aNewState == READY) {
ReportHashStats();
}
// Try to evict entries over limit everytime we're leaving state READING,
// BUILDING or UPDATING, but not during shutdown or when removing all
// entries.
if (!mShuttingDown && !mRemovingAll && aNewState != SHUTDOWN &&
(mState == READING || mState == BUILDING || mState == UPDATING)) {
CacheFileIOManager::EvictIfOverLimit();
}
mState = aNewState;
if (mState != SHUTDOWN) {
CacheFileIOManager::CacheIndexStateChanged();
}
NotifyAsyncGetDiskConsumptionCallbacks();
}
void
CacheIndex::NotifyAsyncGetDiskConsumptionCallbacks()
{
if ((mState == READY || mState == WRITING) && !mAsyncGetDiskConsumptionBlocked && mDiskConsumptionObservers.Length()) {
for (uint32_t i = 0; i < mDiskConsumptionObservers.Length(); ++i) {
DiskConsumptionObserver* o = mDiskConsumptionObservers[i];
// Safe to call under the lock. We always post to the main thread.
o->OnDiskConsumption(mIndexStats.Size() << 10);
}
mDiskConsumptionObservers.Clear();
}
}
void
CacheIndex::AllocBuffer()
{
switch (mState) {
case WRITING:
mRWBufSize = sizeof(CacheIndexHeader) + sizeof(CacheHash::Hash32_t) +
mProcessEntries * sizeof(CacheIndexRecord);
if (mRWBufSize > kMaxBufSize) {
mRWBufSize = kMaxBufSize;
}
break;
case READING:
mRWBufSize = kMaxBufSize;
break;
default:
MOZ_ASSERT(false, "Unexpected state!");
}
mRWBuf = static_cast<char *>(moz_xmalloc(mRWBufSize));
}
void
CacheIndex::ReleaseBuffer()
{
sLock.AssertCurrentThreadOwns();
if (!mRWBuf || mRWPending) {
return;
}
LOG(("CacheIndex::ReleaseBuffer() releasing buffer"));
free(mRWBuf);
mRWBuf = nullptr;
mRWBufSize = 0;
mRWBufPos = 0;
}
void
CacheIndex::FrecencyArray::AppendRecord(CacheIndexRecord *aRecord)
{
LOG(("CacheIndex::FrecencyArray::AppendRecord() [record=%p, hash=%08x%08x%08x"
"%08x%08x]", aRecord, LOGSHA1(aRecord->mHash)));
MOZ_ASSERT(!mRecs.Contains(aRecord));
mRecs.AppendElement(aRecord);
// If the new frecency is 0, the element should be at the end of the array,
// i.e. this change doesn't affect order of the array
if (aRecord->mFrecency != 0) {
++mUnsortedElements;
}
}
void
CacheIndex::FrecencyArray::RemoveRecord(CacheIndexRecord *aRecord)
{
LOG(("CacheIndex::FrecencyArray::RemoveRecord() [record=%p]", aRecord));
decltype(mRecs)::index_type idx;
idx = mRecs.IndexOf(aRecord);
MOZ_RELEASE_ASSERT(idx != mRecs.NoIndex);
mRecs[idx] = nullptr;
++mRemovedElements;
// Calling SortIfNeeded ensures that we get rid of removed elements in the
// array once we hit the limit.
SortIfNeeded();
}
void
CacheIndex::FrecencyArray::ReplaceRecord(CacheIndexRecord *aOldRecord,
CacheIndexRecord *aNewRecord)
{
LOG(("CacheIndex::FrecencyArray::ReplaceRecord() [oldRecord=%p, "
"newRecord=%p]", aOldRecord, aNewRecord));
decltype(mRecs)::index_type idx;
idx = mRecs.IndexOf(aOldRecord);
MOZ_RELEASE_ASSERT(idx != mRecs.NoIndex);
mRecs[idx] = aNewRecord;
}
void
CacheIndex::FrecencyArray::SortIfNeeded()
{
const uint32_t kMaxUnsortedCount = 512;
const uint32_t kMaxUnsortedPercent = 10;
const uint32_t kMaxRemovedCount = 512;
uint32_t unsortedLimit =
std::min<uint32_t>(kMaxUnsortedCount, Length() * kMaxUnsortedPercent / 100);
if (mUnsortedElements > unsortedLimit ||
mRemovedElements > kMaxRemovedCount) {
LOG(("CacheIndex::FrecencyArray::SortIfNeeded() - Sorting array "
"[unsortedElements=%u, unsortedLimit=%u, removedElements=%u, "
"maxRemovedCount=%u]", mUnsortedElements, unsortedLimit,
mRemovedElements, kMaxRemovedCount));
mRecs.Sort(FrecencyComparator());
mUnsortedElements = 0;
if (mRemovedElements) {
#ifdef DEBUG
for (uint32_t i = Length(); i < mRecs.Length(); ++i) {
MOZ_ASSERT(!mRecs[i]);
}
#endif
// Removed elements are at the end after sorting.
mRecs.RemoveElementsAt(Length(), mRemovedElements);
mRemovedElements = 0;
}
}
}
void
CacheIndex::AddRecordToIterators(CacheIndexRecord *aRecord)
{
sLock.AssertCurrentThreadOwns();
for (uint32_t i = 0; i < mIterators.Length(); ++i) {
// Add a new record only when iterator is supposed to be updated.
if (mIterators[i]->ShouldBeNewAdded()) {
mIterators[i]->AddRecord(aRecord);
}
}
}
void
CacheIndex::RemoveRecordFromIterators(CacheIndexRecord *aRecord)
{
sLock.AssertCurrentThreadOwns();
for (uint32_t i = 0; i < mIterators.Length(); ++i) {
// Remove the record from iterator always, it makes no sence to return
// non-existing entries. Also the pointer to the record is no longer valid
// once the entry is removed from index.
mIterators[i]->RemoveRecord(aRecord);
}
}
void
CacheIndex::ReplaceRecordInIterators(CacheIndexRecord *aOldRecord,
CacheIndexRecord *aNewRecord)
{
sLock.AssertCurrentThreadOwns();
for (uint32_t i = 0; i < mIterators.Length(); ++i) {
// We have to replace the record always since the pointer is no longer
// valid after this point. NOTE: Replacing the record doesn't mean that
// a new entry was added, it just means that the data in the entry was
// changed (e.g. a file size) and we had to track this change in
// mPendingUpdates since mIndex was read-only.
mIterators[i]->ReplaceRecord(aOldRecord, aNewRecord);
}
}
nsresult
CacheIndex::Run()
{
LOG(("CacheIndex::Run()"));
StaticMutexAutoLock lock(sLock);
if (!IsIndexUsable()) {
return NS_ERROR_NOT_AVAILABLE;
}
if (mState == READY && mShuttingDown) {
return NS_OK;
}
mUpdateEventPending = false;
switch (mState) {
case BUILDING:
BuildIndex();
break;
case UPDATING:
UpdateIndex();
break;
default:
LOG(("CacheIndex::Run() - Update/Build was canceled"));
}
return NS_OK;
}
nsresult
CacheIndex::OnFileOpenedInternal(FileOpenHelper *aOpener,
CacheFileHandle *aHandle, nsresult aResult)
{
LOG(("CacheIndex::OnFileOpenedInternal() [opener=%p, handle=%p, "
"result=0x%08" PRIx32 "]", aOpener, aHandle, static_cast<uint32_t>(aResult)));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
nsresult rv;
sLock.AssertCurrentThreadOwns();
MOZ_RELEASE_ASSERT(IsIndexUsable());
if (mState == READY && mShuttingDown) {
return NS_OK;
}
switch (mState) {
case WRITING:
MOZ_ASSERT(aOpener == mIndexFileOpener);
mIndexFileOpener = nullptr;
if (NS_FAILED(aResult)) {
LOG(("CacheIndex::OnFileOpenedInternal() - Can't open index file for "
"writing [rv=0x%08" PRIx32 "]", static_cast<uint32_t>(aResult)));
FinishWrite(false);
} else {
mIndexHandle = aHandle;
WriteRecords();
}
break;
case READING:
if (aOpener == mIndexFileOpener) {
mIndexFileOpener = nullptr;
if (NS_SUCCEEDED(aResult)) {
if (aHandle->FileSize() == 0) {
FinishRead(false);
CacheFileIOManager::DoomFile(aHandle, nullptr);
break;
}
mIndexHandle = aHandle;
} else {
FinishRead(false);
break;
}
} else if (aOpener == mJournalFileOpener) {
mJournalFileOpener = nullptr;
mJournalHandle = aHandle;
} else if (aOpener == mTmpFileOpener) {
mTmpFileOpener = nullptr;
mTmpHandle = aHandle;
} else {
MOZ_ASSERT(false, "Unexpected state!");
}
if (mIndexFileOpener || mJournalFileOpener || mTmpFileOpener) {
// Some opener still didn't finish
break;
}
// We fail and cancel all other openers when we opening index file fails.
MOZ_ASSERT(mIndexHandle);
if (mTmpHandle) {
CacheFileIOManager::DoomFile(mTmpHandle, nullptr);
mTmpHandle = nullptr;
if (mJournalHandle) { // this shouldn't normally happen
LOG(("CacheIndex::OnFileOpenedInternal() - Unexpected state, all "
"files [%s, %s, %s] should never exist. Removing whole index.",
INDEX_NAME, JOURNAL_NAME, TEMP_INDEX_NAME));
FinishRead(false);
break;
}
}
if (mJournalHandle) {
// Rename journal to make sure we update index on next start in case
// firefox crashes
rv = CacheFileIOManager::RenameFile(
mJournalHandle, NS_LITERAL_CSTRING(TEMP_INDEX_NAME), this);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::OnFileOpenedInternal() - CacheFileIOManager::"
"RenameFile() failed synchronously [rv=0x%08" PRIx32 "]",
static_cast<uint32_t>(rv)));
FinishRead(false);
break;
}
} else {
StartReadingIndex();
}
break;
default:
MOZ_ASSERT(false, "Unexpected state!");
}
return NS_OK;
}
nsresult
CacheIndex::OnFileOpened(CacheFileHandle *aHandle, nsresult aResult)
{
MOZ_CRASH("CacheIndex::OnFileOpened should not be called!");
return NS_ERROR_UNEXPECTED;
}
nsresult
CacheIndex::OnDataWritten(CacheFileHandle *aHandle, const char *aBuf,
nsresult aResult)
{
LOG(("CacheIndex::OnDataWritten() [handle=%p, result=0x%08" PRIx32 "]", aHandle,
static_cast<uint32_t>(aResult)));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
nsresult rv;
StaticMutexAutoLock lock(sLock);
MOZ_RELEASE_ASSERT(IsIndexUsable());
MOZ_RELEASE_ASSERT(mRWPending);
mRWPending = false;
if (mState == READY && mShuttingDown) {
return NS_OK;
}
switch (mState) {
case WRITING:
MOZ_ASSERT(mIndexHandle == aHandle);
if (NS_FAILED(aResult)) {
FinishWrite(false);
} else {
if (mSkipEntries == mProcessEntries) {
rv = CacheFileIOManager::RenameFile(mIndexHandle,
NS_LITERAL_CSTRING(INDEX_NAME),
this);
if (NS_FAILED(rv)) {
LOG(("CacheIndex::OnDataWritten() - CacheFileIOManager::"
"RenameFile() failed synchronously [rv=0x%08" PRIx32 "]",
static_cast<uint32_t>(rv)));
FinishWrite(false);
}
} else {
WriteRecords();
}
}
break;
default:
// Writing was canceled.
LOG(("CacheIndex::OnDataWritten() - ignoring notification since the "
"operation was previously canceled [state=%d]", mState));
ReleaseBuffer();
}
return NS_OK;
}
nsresult
CacheIndex::OnDataRead(CacheFileHandle *aHandle, char *aBuf, nsresult aResult)
{
LOG(("CacheIndex::OnDataRead() [handle=%p, result=0x%08" PRIx32 "]", aHandle,
static_cast<uint32_t>(aResult)));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
StaticMutexAutoLock lock(sLock);
MOZ_RELEASE_ASSERT(IsIndexUsable());
MOZ_RELEASE_ASSERT(mRWPending);
mRWPending = false;
switch (mState) {
case READING:
MOZ_ASSERT(mIndexHandle == aHandle || mJournalHandle == aHandle);
if (NS_FAILED(aResult)) {
FinishRead(false);
} else {
if (!mIndexOnDiskIsValid) {
ParseRecords();
} else {
ParseJournal();
}
}
break;
default:
// Reading was canceled.
LOG(("CacheIndex::OnDataRead() - ignoring notification since the "
"operation was previously canceled [state=%d]", mState));
ReleaseBuffer();
}
return NS_OK;
}
nsresult
CacheIndex::OnFileDoomed(CacheFileHandle *aHandle, nsresult aResult)
{
MOZ_CRASH("CacheIndex::OnFileDoomed should not be called!");
return NS_ERROR_UNEXPECTED;
}
nsresult
CacheIndex::OnEOFSet(CacheFileHandle *aHandle, nsresult aResult)
{
MOZ_CRASH("CacheIndex::OnEOFSet should not be called!");
return NS_ERROR_UNEXPECTED;
}
nsresult
CacheIndex::OnFileRenamed(CacheFileHandle *aHandle, nsresult aResult)
{
LOG(("CacheIndex::OnFileRenamed() [handle=%p, result=0x%08" PRIx32 "]", aHandle,
static_cast<uint32_t>(aResult)));
MOZ_ASSERT(CacheFileIOManager::IsOnIOThread());
StaticMutexAutoLock lock(sLock);
MOZ_RELEASE_ASSERT(IsIndexUsable());
if (mState == READY && mShuttingDown) {
return NS_OK;
}
switch (mState) {
case WRITING:
// This is a result of renaming the new index written to tmpfile to index
// file. This is the last step when writing the index and the whole
// writing process is successful iff renaming was successful.
if (mIndexHandle != aHandle) {
LOG(("CacheIndex::OnFileRenamed() - ignoring notification since it "
"belongs to previously canceled operation [state=%d]", mState));
break;
}
FinishWrite(NS_SUCCEEDED(aResult));
break;
case READING:
// This is a result of renaming journal file to tmpfile. It is renamed
// before we start reading index and journal file and it should normally
// succeed. If it fails give up reading of index.
if (mJournalHandle != aHandle) {
LOG(("CacheIndex::OnFileRenamed() - ignoring notification since it "
"belongs to previously canceled operation [state=%d]", mState));
break;
}
if (NS_FAILED(aResult)) {
FinishRead(false);
} else {
StartReadingIndex();
}
break;
default:
// Reading/writing was canceled.
LOG(("CacheIndex::OnFileRenamed() - ignoring notification since the "
"operation was previously canceled [state=%d]", mState));
}
return NS_OK;
}
// Memory reporting
size_t
CacheIndex::SizeOfExcludingThisInternal(mozilla::MallocSizeOf mallocSizeOf) const
{
sLock.AssertCurrentThreadOwns();
size_t n = 0;
nsCOMPtr<nsISizeOf> sizeOf;
// mIndexHandle and mJournalHandle are reported via SizeOfHandlesRunnable
// in CacheFileIOManager::SizeOfExcludingThisInternal as part of special
// handles array.
sizeOf = do_QueryInterface(mCacheDirectory);
if (sizeOf) {
n += sizeOf->SizeOfIncludingThis(mallocSizeOf);
}
sizeOf = do_QueryInterface(mUpdateTimer);
if (sizeOf) {
n += sizeOf->SizeOfIncludingThis(mallocSizeOf);
}
n += mallocSizeOf(mRWBuf);
n += mallocSizeOf(mRWHash);
n += mIndex.SizeOfExcludingThis(mallocSizeOf);
n += mPendingUpdates.SizeOfExcludingThis(mallocSizeOf);
n += mTmpJournal.SizeOfExcludingThis(mallocSizeOf);
// mFrecencyArray items are reported by mIndex/mPendingUpdates
n += mFrecencyArray.mRecs.ShallowSizeOfExcludingThis(mallocSizeOf);
n += mDiskConsumptionObservers.ShallowSizeOfExcludingThis(mallocSizeOf);
return n;
}
// static
size_t
CacheIndex::SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf)
{
sLock.AssertCurrentThreadOwns();
if (!gInstance)
return 0;
return gInstance->SizeOfExcludingThisInternal(mallocSizeOf);
}
// static
size_t
CacheIndex::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf)
{
StaticMutexAutoLock lock(sLock);
return mallocSizeOf(gInstance) + SizeOfExcludingThis(mallocSizeOf);
}
namespace {
class HashComparator
{
public:
bool Equals(CacheIndexRecord* a, CacheIndexRecord* b) const {
return memcmp(&a->mHash, &b->mHash, sizeof(SHA1Sum::Hash)) == 0;
}
bool LessThan(CacheIndexRecord* a, CacheIndexRecord* b) const {
return memcmp(&a->mHash, &b->mHash, sizeof(SHA1Sum::Hash)) < 0;
}
};
void
ReportHashSizeMatch(const SHA1Sum::Hash *aHash1, const SHA1Sum::Hash *aHash2)
{
const uint32_t *h1 = reinterpret_cast<const uint32_t *>(aHash1);
const uint32_t *h2 = reinterpret_cast<const uint32_t *>(aHash2);
for (uint32_t i = 0; i < 5; ++i) {
if (h1[i] != h2[i]) {
uint32_t bitsDiff = h1[i] ^ h2[i];
bitsDiff = NetworkEndian::readUint32(&bitsDiff);
// count leading zeros in bitsDiff
static const uint8_t debruijn32[32] =
{ 0, 31, 9, 30, 3, 8, 13, 29, 2, 5, 7, 21, 12, 24, 28, 19,
1, 10, 4, 14, 6, 22, 25, 20, 11, 15, 23, 26, 16, 27, 17, 18};
bitsDiff |= bitsDiff>>1;
bitsDiff |= bitsDiff>>2;
bitsDiff |= bitsDiff>>4;
bitsDiff |= bitsDiff>>8;
bitsDiff |= bitsDiff>>16;
bitsDiff++;
uint8_t hashSizeMatch = debruijn32[bitsDiff*0x076be629>>27] + (i<<5);
Telemetry::Accumulate(Telemetry::NETWORK_CACHE_HASH_STATS, hashSizeMatch);
return;
}
}
MOZ_ASSERT(false, "Found a collision in the index!");
}
} // namespace
void
CacheIndex::ReportHashStats()
{
// We're gathering the hash stats only once, exclude too small caches.
if (CacheObserver::HashStatsReported() || mFrecencyArray.Length() < 15000) {
return;
}
nsTArray<CacheIndexRecord *> records;
for (auto iter = mFrecencyArray.Iter(); !iter.Done(); iter.Next()) {
records.AppendElement(iter.Get());
}
records.Sort(HashComparator());
for (uint32_t i = 1; i < records.Length(); i++) {
ReportHashSizeMatch(&records[i-1]->mHash, &records[i]->mHash);
}
CacheObserver::SetHashStatsReported();
}
// static
void
CacheIndex::OnAsyncEviction(bool aEvicting)
{
RefPtr<CacheIndex> index = gInstance;
if (!index) {
return;
}
StaticMutexAutoLock lock(sLock);
index->mAsyncGetDiskConsumptionBlocked = aEvicting;
if (!aEvicting) {
index->NotifyAsyncGetDiskConsumptionCallbacks();
}
}
} // namespace net
} // namespace mozilla
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