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gecko-dev/netwerk/cache2/CacheFileIOManager.cpp

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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 "CacheLog.h"
#include "CacheFileIOManager.h"
#include "../cache/nsCacheUtils.h"
#include "CacheHashUtils.h"
#include "CacheStorageService.h"
#include "nsThreadUtils.h"
#include "nsIFile.h"
#include "mozilla/Telemetry.h"
#include "mozilla/DebugOnly.h"
#include "nsDirectoryServiceUtils.h"
#include "nsAppDirectoryServiceDefs.h"
#include "private/pprio.h"
#include "mozilla/VisualEventTracer.h"
// include files for ftruncate (or equivalent)
#if defined(XP_UNIX)
#include <unistd.h>
#elif defined(XP_WIN)
#include <windows.h>
#undef CreateFile
#undef CREATE_NEW
#elif defined(XP_OS2)
#define INCL_DOSERRORS
#include <os2.h>
#else
// XXX add necessary include file for ftruncate (or equivalent)
#endif
namespace mozilla {
namespace net {
#define kOpenHandlesLimit 64
NS_IMPL_ADDREF(CacheFileHandle)
NS_IMETHODIMP_(nsrefcnt)
CacheFileHandle::Release()
{
LOG(("CacheFileHandle::Release() [this=%p, refcnt=%d]", this, mRefCnt.get()));
NS_PRECONDITION(0 != mRefCnt, "dup release");
nsrefcnt count = --mRefCnt;
NS_LOG_RELEASE(this, count, "CacheFileHandle");
if (0 == count) {
mRefCnt = 1;
delete (this);
return 0;
}
if (!mRemovingHandle && count == 1 && !mClosed) {
CacheFileIOManager::gInstance->CloseHandle(this);
}
return count;
}
NS_INTERFACE_MAP_BEGIN(CacheFileHandle)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END_THREADSAFE
CacheFileHandle::CacheFileHandle(const SHA1Sum::Hash *aHash,
bool aPriority)
: mHash(aHash)
, mIsDoomed(false)
, mRemovingHandle(false)
, mPriority(aPriority)
, mClosed(false)
, mInvalid(false)
, mFileExists(false)
, mFileSize(-1)
, mFD(nullptr)
{
LOG(("CacheFileHandle::CacheFileHandle() [this=%p]", this));
MOZ_COUNT_CTOR(CacheFileHandle);
PR_INIT_CLIST(this);
}
CacheFileHandle::~CacheFileHandle()
{
LOG(("CacheFileHandle::~CacheFileHandle() [this=%p]", this));
MOZ_COUNT_DTOR(CacheFileHandle);
}
/******************************************************************************
* CacheFileHandles
*****************************************************************************/
class CacheFileHandlesEntry : public PLDHashEntryHdr
{
public:
PRCList *mHandles;
SHA1Sum::Hash mHash;
};
PLDHashTableOps CacheFileHandles::mOps =
{
PL_DHashAllocTable,
PL_DHashFreeTable,
HashKey,
MatchEntry,
MoveEntry,
ClearEntry,
PL_DHashFinalizeStub
};
CacheFileHandles::CacheFileHandles()
: mInitialized(false)
{
LOG(("CacheFileHandles::CacheFileHandles() [this=%p]", this));
MOZ_COUNT_CTOR(CacheFileHandles);
}
CacheFileHandles::~CacheFileHandles()
{
LOG(("CacheFileHandles::~CacheFileHandles() [this=%p]", this));
MOZ_COUNT_DTOR(CacheFileHandles);
if (mInitialized)
Shutdown();
}
nsresult
CacheFileHandles::Init()
{
LOG(("CacheFileHandles::Init() %p", this));
MOZ_ASSERT(!mInitialized);
mInitialized = PL_DHashTableInit(&mTable, &mOps, nullptr,
sizeof(CacheFileHandlesEntry), 512);
return mInitialized ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
void
CacheFileHandles::Shutdown()
{
LOG(("CacheFileHandles::Shutdown() %p", this));
if (mInitialized) {
PL_DHashTableFinish(&mTable);
mInitialized = false;
}
}
PLDHashNumber
CacheFileHandles::HashKey(PLDHashTable *table, const void *key)
{
const SHA1Sum::Hash *hash = static_cast<const SHA1Sum::Hash *>(key);
return static_cast<PLDHashNumber>(((*hash)[0] << 24) | ((*hash)[1] << 16) |
((*hash)[2] << 8) | (*hash)[3]);
}
bool
CacheFileHandles::MatchEntry(PLDHashTable *table,
const PLDHashEntryHdr *header,
const void *key)
{
const CacheFileHandlesEntry *entry;
entry = static_cast<const CacheFileHandlesEntry *>(header);
return (memcmp(&entry->mHash, key, sizeof(SHA1Sum::Hash)) == 0);
}
void
CacheFileHandles::MoveEntry(PLDHashTable *table,
const PLDHashEntryHdr *from,
PLDHashEntryHdr *to)
{
const CacheFileHandlesEntry *src;
CacheFileHandlesEntry *dst;
src = static_cast<const CacheFileHandlesEntry *>(from);
dst = static_cast<CacheFileHandlesEntry *>(to);
dst->mHandles = src->mHandles;
memcpy(&dst->mHash, &src->mHash, sizeof(SHA1Sum::Hash));
LOG(("CacheFileHandles::MoveEntry() hash=%08x%08x%08x%08x%08x "
"moving from %p to %p", LOGSHA1(src->mHash), from, to));
// update pointer to mHash in all handles
CacheFileHandle *handle = (CacheFileHandle *)PR_LIST_HEAD(dst->mHandles);
while (handle != dst->mHandles) {
handle->mHash = &dst->mHash;
handle = (CacheFileHandle *)PR_NEXT_LINK(handle);
}
}
void
CacheFileHandles::ClearEntry(PLDHashTable *table,
PLDHashEntryHdr *header)
{
CacheFileHandlesEntry *entry = static_cast<CacheFileHandlesEntry *>(header);
delete entry->mHandles;
entry->mHandles = nullptr;
}
nsresult
CacheFileHandles::GetHandle(const SHA1Sum::Hash *aHash,
CacheFileHandle **_retval)
{
MOZ_ASSERT(mInitialized);
// find hash entry for key
CacheFileHandlesEntry *entry;
entry = static_cast<CacheFileHandlesEntry *>(
PL_DHashTableOperate(&mTable,
(void *)aHash,
PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_FREE(entry)) {
LOG(("CacheFileHandles::GetHandle() hash=%08x%08x%08x%08x%08x "
"no handle found", LOGSHA1(aHash)));
return NS_ERROR_NOT_AVAILABLE;
}
// Check if the entry is doomed
CacheFileHandle *handle = static_cast<CacheFileHandle *>(
PR_LIST_HEAD(entry->mHandles));
if (handle->IsDoomed()) {
LOG(("CacheFileHandles::GetHandle() hash=%08x%08x%08x%08x%08x "
"found doomed handle %p, entry %p", LOGSHA1(aHash), handle, entry));
return NS_ERROR_NOT_AVAILABLE;
}
LOG(("CacheFileHandles::GetHandle() hash=%08x%08x%08x%08x%08x "
"found handle %p, entry %p", LOGSHA1(aHash), handle, entry));
NS_ADDREF(*_retval = handle);
return NS_OK;
}
nsresult
CacheFileHandles::NewHandle(const SHA1Sum::Hash *aHash,
bool aPriority,
CacheFileHandle **_retval)
{
MOZ_ASSERT(mInitialized);
// find hash entry for key
CacheFileHandlesEntry *entry;
entry = static_cast<CacheFileHandlesEntry *>(
PL_DHashTableOperate(&mTable,
(void *)aHash,
PL_DHASH_ADD));
if (!entry) return NS_ERROR_OUT_OF_MEMORY;
if (!entry->mHandles) {
// new entry
entry->mHandles = new PRCList;
memcpy(&entry->mHash, aHash, sizeof(SHA1Sum::Hash));
PR_INIT_CLIST(entry->mHandles);
LOG(("CacheFileHandles::NewHandle() hash=%08x%08x%08x%08x%08x "
"created new entry %p, list %p", LOGSHA1(aHash), entry,
entry->mHandles));
}
#ifdef DEBUG
else {
MOZ_ASSERT(!PR_CLIST_IS_EMPTY(entry->mHandles));
CacheFileHandle *handle = (CacheFileHandle *)PR_LIST_HEAD(entry->mHandles);
MOZ_ASSERT(handle->IsDoomed());
}
#endif
nsRefPtr<CacheFileHandle> handle = new CacheFileHandle(&entry->mHash, aPriority);
PR_APPEND_LINK(handle, entry->mHandles);
LOG(("CacheFileHandles::NewHandle() hash=%08x%08x%08x%08x%08x "
"created new handle %p, entry=%p", LOGSHA1(aHash), handle.get(), entry));
NS_ADDREF(*_retval = handle);
handle.forget();
return NS_OK;
}
void
CacheFileHandles::RemoveHandle(CacheFileHandle *aHandle)
{
MOZ_ASSERT(mInitialized);
void *key = (void *)aHandle->Hash();
CacheFileHandlesEntry *entry;
entry = static_cast<CacheFileHandlesEntry *>(
PL_DHashTableOperate(&mTable, key, PL_DHASH_LOOKUP));
MOZ_ASSERT(PL_DHASH_ENTRY_IS_BUSY(entry));
#ifdef DEBUG
{
CacheFileHandle *handle = (CacheFileHandle *)PR_LIST_HEAD(entry->mHandles);
bool handleFound = false;
while (handle != entry->mHandles) {
if (handle == aHandle) {
handleFound = true;
break;
}
handle = (CacheFileHandle *)PR_NEXT_LINK(handle);
}
MOZ_ASSERT(handleFound);
}
#endif
LOG(("CacheFileHandles::RemoveHandle() hash=%08x%08x%08x%08x%08x "
"removing handle %p", LOGSHA1(&entry->mHash), aHandle));
PR_REMOVE_AND_INIT_LINK(aHandle);
NS_RELEASE(aHandle);
if (PR_CLIST_IS_EMPTY(entry->mHandles)) {
LOG(("CacheFileHandles::RemoveHandle() hash=%08x%08x%08x%08x%08x "
"list %p is empty, removing entry %p", LOGSHA1(&entry->mHash),
entry->mHandles, entry));
PL_DHashTableOperate(&mTable, key, PL_DHASH_REMOVE);
}
}
PLDHashOperator
GetHandles(PLDHashTable *table,
PLDHashEntryHdr *hdr,
uint32_t number,
void * arg)
{
const CacheFileHandlesEntry *entry;
nsTArray<nsRefPtr<CacheFileHandle> > *handles;
entry = static_cast<const CacheFileHandlesEntry *>(hdr);
handles = reinterpret_cast<nsTArray<nsRefPtr<CacheFileHandle> > *>(arg);
CacheFileHandle *handle = (CacheFileHandle *)PR_LIST_HEAD(entry->mHandles);
while (handle != entry->mHandles) {
handles->AppendElement(handle);
handle = (CacheFileHandle *)PR_NEXT_LINK(handle);
}
return PL_DHASH_NEXT;
}
void
CacheFileHandles::GetAllHandles(nsTArray<nsRefPtr<CacheFileHandle> > *_retval)
{
MOZ_ASSERT(mInitialized);
PL_DHashTableEnumerate(&mTable, GetHandles, _retval);
}
uint32_t
CacheFileHandles::HandleCount()
{
MOZ_ASSERT(mInitialized);
return mTable.entryCount;
}
// Events
class ShutdownEvent : public nsRunnable {
public:
ShutdownEvent(mozilla::Mutex *aLock, mozilla::CondVar *aCondVar)
: mLock(aLock)
, mCondVar(aCondVar)
{
MOZ_COUNT_CTOR(ShutdownEvent);
}
~ShutdownEvent()
{
MOZ_COUNT_DTOR(ShutdownEvent);
}
NS_IMETHOD Run()
{
MutexAutoLock lock(*mLock);
CacheFileIOManager::gInstance->ShutdownInternal();
mCondVar->Notify();
return NS_OK;
}
protected:
mozilla::Mutex *mLock;
mozilla::CondVar *mCondVar;
};
class OpenFileEvent : public nsRunnable {
public:
OpenFileEvent(const nsACString &aKey,
uint32_t aFlags,
CacheFileIOListener *aCallback)
: mFlags(aFlags)
, mCallback(aCallback)
, mRV(NS_ERROR_FAILURE)
, mKey(aKey)
{
MOZ_COUNT_CTOR(OpenFileEvent);
mTarget = static_cast<nsIEventTarget*>(NS_GetCurrentThread());
mIOMan = CacheFileIOManager::gInstance;
MOZ_ASSERT(mTarget);
MOZ_EVENT_TRACER_NAME_OBJECT(static_cast<nsIRunnable*>(this), aKey.BeginReading());
MOZ_EVENT_TRACER_WAIT(static_cast<nsIRunnable*>(this), "net::cache::open-background");
}
~OpenFileEvent()
{
MOZ_COUNT_DTOR(OpenFileEvent);
}
NS_IMETHOD Run()
{
if (mTarget) {
mRV = NS_OK;
if (mFlags & CacheFileIOManager::NOHASH) {
nsACString::const_char_iterator begin, end;
begin = mKey.BeginReading();
end = mKey.EndReading();
uint32_t i = 0;
while (begin != end && i < (SHA1Sum::HashSize << 1)) {
if (!(i & 1))
mHash[i >> 1] = 0;
uint8_t shift = (i & 1) ? 0 : 4;
if (*begin >= '0' && *begin <= '9')
mHash[i >> 1] |= (*begin - '0') << shift;
else if (*begin >= 'A' && *begin <= 'F')
mHash[i >> 1] |= (*begin - 'A' + 10) << shift;
else
break;
++i;
++begin;
}
if (i != (SHA1Sum::HashSize << 1) || begin != end)
mRV = NS_ERROR_INVALID_ARG;
}
else {
SHA1Sum sum;
sum.update(mKey.BeginReading(), mKey.Length());
sum.finish(mHash);
}
MOZ_EVENT_TRACER_EXEC(static_cast<nsIRunnable*>(this), "net::cache::open-background");
if (NS_SUCCEEDED(mRV)) {
if (!mIOMan)
mRV = NS_ERROR_NOT_INITIALIZED;
else {
mRV = mIOMan->OpenFileInternal(&mHash, mFlags, getter_AddRefs(mHandle));
mIOMan = nullptr;
if (mHandle) {
MOZ_EVENT_TRACER_NAME_OBJECT(mHandle.get(), mKey.get());
mHandle->Key() = mKey;
}
}
}
MOZ_EVENT_TRACER_DONE(static_cast<nsIRunnable*>(this), "net::cache::open-background");
MOZ_EVENT_TRACER_WAIT(static_cast<nsIRunnable*>(this), "net::cache::open-result");
nsCOMPtr<nsIEventTarget> target;
mTarget.swap(target);
target->Dispatch(this, nsIEventTarget::DISPATCH_NORMAL);
}
else {
MOZ_EVENT_TRACER_EXEC(static_cast<nsIRunnable*>(this), "net::cache::open-result");
mCallback->OnFileOpened(mHandle, mRV);
MOZ_EVENT_TRACER_DONE(static_cast<nsIRunnable*>(this), "net::cache::open-result");
}
return NS_OK;
}
protected:
SHA1Sum::Hash mHash;
uint32_t mFlags;
nsCOMPtr<CacheFileIOListener> mCallback;
nsCOMPtr<nsIEventTarget> mTarget;
nsRefPtr<CacheFileIOManager> mIOMan;
nsRefPtr<CacheFileHandle> mHandle;
nsresult mRV;
nsCString mKey;
};
class CloseHandleEvent : public nsRunnable {
public:
CloseHandleEvent(CacheFileHandle *aHandle)
: mHandle(aHandle)
{
MOZ_COUNT_CTOR(CloseHandleEvent);
}
~CloseHandleEvent()
{
MOZ_COUNT_DTOR(CloseHandleEvent);
}
NS_IMETHOD Run()
{
if (!mHandle->IsClosed())
CacheFileIOManager::gInstance->CloseHandleInternal(mHandle);
return NS_OK;
}
protected:
nsRefPtr<CacheFileHandle> mHandle;
};
class ReadEvent : public nsRunnable {
public:
ReadEvent(CacheFileHandle *aHandle, int64_t aOffset, char *aBuf,
int32_t aCount, CacheFileIOListener *aCallback)
: mHandle(aHandle)
, mOffset(aOffset)
, mBuf(aBuf)
, mCount(aCount)
, mCallback(aCallback)
, mRV(NS_ERROR_FAILURE)
{
MOZ_COUNT_CTOR(ReadEvent);
mTarget = static_cast<nsIEventTarget*>(NS_GetCurrentThread());
MOZ_EVENT_TRACER_NAME_OBJECT(static_cast<nsIRunnable*>(this), aHandle->Key().get());
MOZ_EVENT_TRACER_WAIT(static_cast<nsIRunnable*>(this), "net::cache::read-background");
}
~ReadEvent()
{
MOZ_COUNT_DTOR(ReadEvent);
}
NS_IMETHOD Run()
{
if (mTarget) {
MOZ_EVENT_TRACER_EXEC(static_cast<nsIRunnable*>(this), "net::cache::read-background");
if (mHandle->IsClosed())
mRV = NS_ERROR_NOT_INITIALIZED;
else
mRV = CacheFileIOManager::gInstance->ReadInternal(
mHandle, mOffset, mBuf, mCount);
MOZ_EVENT_TRACER_DONE(static_cast<nsIRunnable*>(this), "net::cache::read-background");
MOZ_EVENT_TRACER_WAIT(static_cast<nsIRunnable*>(this), "net::cache::read-result");
nsCOMPtr<nsIEventTarget> target;
mTarget.swap(target);
target->Dispatch(this, nsIEventTarget::DISPATCH_NORMAL);
}
else {
MOZ_EVENT_TRACER_EXEC(static_cast<nsIRunnable*>(this), "net::cache::read-result");
if (mCallback)
mCallback->OnDataRead(mHandle, mBuf, mRV);
MOZ_EVENT_TRACER_DONE(static_cast<nsIRunnable*>(this), "net::cache::read-result");
}
return NS_OK;
}
protected:
nsRefPtr<CacheFileHandle> mHandle;
int64_t mOffset;
char *mBuf;
int32_t mCount;
nsCOMPtr<CacheFileIOListener> mCallback;
nsCOMPtr<nsIEventTarget> mTarget;
nsresult mRV;
};
class WriteEvent : public nsRunnable {
public:
WriteEvent(CacheFileHandle *aHandle, int64_t aOffset, const char *aBuf,
int32_t aCount, bool aValidate, CacheFileIOListener *aCallback)
: mHandle(aHandle)
, mOffset(aOffset)
, mBuf(aBuf)
, mCount(aCount)
, mValidate(aValidate)
, mCallback(aCallback)
, mRV(NS_ERROR_FAILURE)
{
MOZ_COUNT_CTOR(WriteEvent);
mTarget = static_cast<nsIEventTarget*>(NS_GetCurrentThread());
MOZ_EVENT_TRACER_NAME_OBJECT(static_cast<nsIRunnable*>(this), aHandle->Key().get());
MOZ_EVENT_TRACER_WAIT(static_cast<nsIRunnable*>(this), "net::cache::write-background");
}
~WriteEvent()
{
MOZ_COUNT_DTOR(WriteEvent);
}
NS_IMETHOD Run()
{
if (mTarget) {
MOZ_EVENT_TRACER_EXEC(static_cast<nsIRunnable*>(this), "net::cache::write-background");
if (mHandle->IsClosed())
mRV = NS_ERROR_NOT_INITIALIZED;
else
mRV = CacheFileIOManager::gInstance->WriteInternal(
mHandle, mOffset, mBuf, mCount, mValidate);
MOZ_EVENT_TRACER_DONE(static_cast<nsIRunnable*>(this), "net::cache::write-background");
MOZ_EVENT_TRACER_WAIT(static_cast<nsIRunnable*>(this), "net::cache::write-result");
nsCOMPtr<nsIEventTarget> target;
mTarget.swap(target);
target->Dispatch(this, nsIEventTarget::DISPATCH_NORMAL);
}
else {
MOZ_EVENT_TRACER_EXEC(static_cast<nsIRunnable*>(this), "net::cache::write-result");
if (mCallback)
mCallback->OnDataWritten(mHandle, mBuf, mRV);
MOZ_EVENT_TRACER_DONE(static_cast<nsIRunnable*>(this), "net::cache::write-result");
}
return NS_OK;
}
protected:
nsRefPtr<CacheFileHandle> mHandle;
int64_t mOffset;
const char *mBuf;
int32_t mCount;
bool mValidate;
nsCOMPtr<CacheFileIOListener> mCallback;
nsCOMPtr<nsIEventTarget> mTarget;
nsresult mRV;
};
class DoomFileEvent : public nsRunnable {
public:
DoomFileEvent(CacheFileHandle *aHandle,
CacheFileIOListener *aCallback)
: mCallback(aCallback)
, mHandle(aHandle)
, mRV(NS_ERROR_FAILURE)
{
MOZ_COUNT_CTOR(DoomFileEvent);
mTarget = static_cast<nsIEventTarget*>(NS_GetCurrentThread());
MOZ_EVENT_TRACER_NAME_OBJECT(static_cast<nsIRunnable*>(this), aHandle->Key().get());
MOZ_EVENT_TRACER_WAIT(static_cast<nsIRunnable*>(this), "net::cache::doom-background");
}
~DoomFileEvent()
{
MOZ_COUNT_DTOR(DoomFileEvent);
}
NS_IMETHOD Run()
{
if (mTarget) {
MOZ_EVENT_TRACER_EXEC(static_cast<nsIRunnable*>(this), "net::cache::doom-background");
if (mHandle->IsClosed())
mRV = NS_ERROR_NOT_INITIALIZED;
else
mRV = CacheFileIOManager::gInstance->DoomFileInternal(mHandle);
MOZ_EVENT_TRACER_DONE(static_cast<nsIRunnable*>(this), "net::cache::doom-background");
MOZ_EVENT_TRACER_WAIT(static_cast<nsIRunnable*>(this), "net::cache::doom-result");
nsCOMPtr<nsIEventTarget> target;
mTarget.swap(target);
target->Dispatch(this, nsIEventTarget::DISPATCH_NORMAL);
}
else {
MOZ_EVENT_TRACER_EXEC(static_cast<nsIRunnable*>(this), "net::cache::doom-result");
if (mCallback)
mCallback->OnFileDoomed(mHandle, mRV);
MOZ_EVENT_TRACER_DONE(static_cast<nsIRunnable*>(this), "net::cache::doom-result");
}
return NS_OK;
}
protected:
nsCOMPtr<CacheFileIOListener> mCallback;
nsCOMPtr<nsIEventTarget> mTarget;
nsRefPtr<CacheFileHandle> mHandle;
nsresult mRV;
};
class DoomFileByKeyEvent : public nsRunnable {
public:
DoomFileByKeyEvent(const nsACString &aKey,
CacheFileIOListener *aCallback)
: mCallback(aCallback)
, mRV(NS_ERROR_FAILURE)
{
MOZ_COUNT_CTOR(DoomFileByKeyEvent);
SHA1Sum sum;
sum.update(aKey.BeginReading(), aKey.Length());
sum.finish(mHash);
mTarget = static_cast<nsIEventTarget*>(NS_GetCurrentThread());
mIOMan = CacheFileIOManager::gInstance;
MOZ_ASSERT(mTarget);
}
~DoomFileByKeyEvent()
{
MOZ_COUNT_DTOR(DoomFileByKeyEvent);
}
NS_IMETHOD Run()
{
if (mTarget) {
if (!mIOMan)
mRV = NS_ERROR_NOT_INITIALIZED;
else {
mRV = mIOMan->DoomFileByKeyInternal(&mHash);
mIOMan = nullptr;
}
nsCOMPtr<nsIEventTarget> target;
mTarget.swap(target);
target->Dispatch(this, nsIEventTarget::DISPATCH_NORMAL);
}
else {
if (mCallback)
mCallback->OnFileDoomed(nullptr, mRV);
}
return NS_OK;
}
protected:
SHA1Sum::Hash mHash;
nsCOMPtr<CacheFileIOListener> mCallback;
nsCOMPtr<nsIEventTarget> mTarget;
nsRefPtr<CacheFileIOManager> mIOMan;
nsresult mRV;
};
class ReleaseNSPRHandleEvent : public nsRunnable {
public:
ReleaseNSPRHandleEvent(CacheFileHandle *aHandle)
: mHandle(aHandle)
{
MOZ_COUNT_CTOR(ReleaseNSPRHandleEvent);
}
~ReleaseNSPRHandleEvent()
{
MOZ_COUNT_DTOR(ReleaseNSPRHandleEvent);
}
NS_IMETHOD Run()
{
if (mHandle->mFD && !mHandle->IsClosed())
CacheFileIOManager::gInstance->ReleaseNSPRHandleInternal(mHandle);
return NS_OK;
}
protected:
nsRefPtr<CacheFileHandle> mHandle;
};
class TruncateSeekSetEOFEvent : public nsRunnable {
public:
TruncateSeekSetEOFEvent(CacheFileHandle *aHandle, int64_t aTruncatePos,
int64_t aEOFPos, CacheFileIOListener *aCallback)
: mHandle(aHandle)
, mTruncatePos(aTruncatePos)
, mEOFPos(aEOFPos)
, mCallback(aCallback)
, mRV(NS_ERROR_FAILURE)
{
MOZ_COUNT_CTOR(TruncateSeekSetEOFEvent);
mTarget = static_cast<nsIEventTarget*>(NS_GetCurrentThread());
}
~TruncateSeekSetEOFEvent()
{
MOZ_COUNT_DTOR(TruncateSeekSetEOFEvent);
}
NS_IMETHOD Run()
{
if (mTarget) {
if (mHandle->IsClosed())
mRV = NS_ERROR_NOT_INITIALIZED;
else
mRV = CacheFileIOManager::gInstance->TruncateSeekSetEOFInternal(
mHandle, mTruncatePos, mEOFPos);
nsCOMPtr<nsIEventTarget> target;
mTarget.swap(target);
target->Dispatch(this, nsIEventTarget::DISPATCH_NORMAL);
}
else {
if (mCallback)
mCallback->OnEOFSet(mHandle, mRV);
}
return NS_OK;
}
protected:
nsRefPtr<CacheFileHandle> mHandle;
int64_t mTruncatePos;
int64_t mEOFPos;
nsCOMPtr<CacheFileIOListener> mCallback;
nsCOMPtr<nsIEventTarget> mTarget;
nsresult mRV;
};
CacheFileIOManager * CacheFileIOManager::gInstance = nullptr;
NS_IMPL_ISUPPORTS0(CacheFileIOManager)
CacheFileIOManager::CacheFileIOManager()
: mShuttingDown(false)
, mTreeCreated(false)
{
LOG(("CacheFileIOManager::CacheFileIOManager [this=%p]", this));
MOZ_COUNT_CTOR(CacheFileIOManager);
MOZ_ASSERT(!gInstance, "multiple CacheFileIOManager instances!");
}
CacheFileIOManager::~CacheFileIOManager()
{
LOG(("CacheFileIOManager::~CacheFileIOManager [this=%p]", this));
MOZ_COUNT_DTOR(CacheFileIOManager);
}
nsresult
CacheFileIOManager::Init()
{
LOG(("CacheFileIOManager::Init()"));
MOZ_ASSERT(NS_IsMainThread());
if (gInstance)
return NS_ERROR_ALREADY_INITIALIZED;
nsRefPtr<CacheFileIOManager> ioMan = new CacheFileIOManager();
nsresult rv = ioMan->InitInternal();
NS_ENSURE_SUCCESS(rv, rv);
ioMan.swap(gInstance);
return NS_OK;
}
nsresult
CacheFileIOManager::InitInternal()
{
nsresult rv;
mIOThread = new CacheIOThread();
rv = mIOThread->Init();
MOZ_ASSERT(NS_SUCCEEDED(rv), "Can't create background thread");
NS_ENSURE_SUCCESS(rv, rv);
rv = mHandles.Init();
if (NS_FAILED(rv)) {
mIOThread->Shutdown();
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
nsresult
CacheFileIOManager::Shutdown()
{
LOG(("CacheFileIOManager::Shutdown() [gInstance=%p]", gInstance));
MOZ_ASSERT(NS_IsMainThread());
if (!gInstance)
return NS_ERROR_NOT_INITIALIZED;
Telemetry::AutoTimer<Telemetry::NETWORK_DISK_CACHE_SHUTDOWN_V2> shutdownTimer;
{
mozilla::Mutex lock("CacheFileIOManager::Shutdown() lock");
mozilla::CondVar condVar(lock, "CacheFileIOManager::Shutdown() condVar");
MutexAutoLock autoLock(lock);
nsRefPtr<ShutdownEvent> ev = new ShutdownEvent(&lock, &condVar);
DebugOnly<nsresult> rv;
rv = gInstance->mIOThread->Dispatch(ev, CacheIOThread::CLOSE);
MOZ_ASSERT(NS_SUCCEEDED(rv));
condVar.Wait();
}
MOZ_ASSERT(gInstance->mHandles.HandleCount() == 0);
MOZ_ASSERT(gInstance->mHandlesByLastUsed.Length() == 0);
nsRefPtr<CacheFileIOManager> ioMan;
ioMan.swap(gInstance);
if (ioMan->mIOThread)
ioMan->mIOThread->Shutdown();
return NS_OK;
}
nsresult
CacheFileIOManager::ShutdownInternal()
{
mShuttingDown = true;
// close all handles and delete all associated files
nsTArray<nsRefPtr<CacheFileHandle> > handles;
mHandles.GetAllHandles(&handles);
for (uint32_t i=0 ; i<handles.Length() ; i++) {
CacheFileHandle *h = handles[i];
h->mRemovingHandle = true;
h->mClosed = true;
// Close file handle
if (h->mFD) {
ReleaseNSPRHandleInternal(h);
}
// Remove file if entry is doomed or invalid
if (h->mFileExists && (h->mIsDoomed || h->mInvalid)) {
h->mFile->Remove(false);
}
// Remove the handle from hashtable
mHandles.RemoveHandle(h);
}
return NS_OK;
}
nsresult
CacheFileIOManager::OnProfile()
{
LOG(("CacheFileIOManager::OnProfile() [gInstance=%p]", gInstance));
MOZ_ASSERT(gInstance);
nsresult rv;
nsCOMPtr<nsIFile> directory;
#if defined(MOZ_WIDGET_ANDROID)
char* cachePath = getenv("CACHE_DIRECTORY");
if (cachePath && *cachePath) {
rv = NS_NewNativeLocalFile(nsDependentCString(cachePath),
true, getter_AddRefs(directory));
}
#endif
if (!directory) {
rv = NS_GetSpecialDirectory(NS_APP_CACHE_PARENT_DIR,
getter_AddRefs(directory));
}
if (!directory) {
rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_LOCAL_50_DIR,
getter_AddRefs(directory));
}
if (directory) {
rv = directory->Clone(getter_AddRefs(gInstance->mCacheDirectory));
NS_ENSURE_SUCCESS(rv, rv);
rv = gInstance->mCacheDirectory->Append(NS_LITERAL_STRING("cache2"));
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
// static
already_AddRefed<nsIEventTarget>
CacheFileIOManager::IOTarget()
{
nsCOMPtr<nsIEventTarget> target;
if (gInstance && gInstance->mIOThread)
target = gInstance->mIOThread->Target();
return target.forget();
}
already_AddRefed<CacheIOThread>
CacheFileIOManager::IOThread()
{
nsRefPtr<CacheIOThread> thread;
if (gInstance)
thread = gInstance->mIOThread;
return thread.forget();
}
nsresult
CacheFileIOManager::OpenFile(const nsACString &aKey,
uint32_t aFlags,
CacheFileIOListener *aCallback)
{
LOG(("CacheFileIOManager::OpenFile() [key=%s, flags=%d, listener=%p]",
PromiseFlatCString(aKey).get(), aFlags, aCallback));
nsresult rv;
CacheFileIOManager *ioMan = gInstance;
if (!ioMan)
return NS_ERROR_NOT_INITIALIZED;
bool priority = aFlags & CacheFileIOManager::PRIORITY;
nsRefPtr<OpenFileEvent> ev = new OpenFileEvent(aKey, aFlags, aCallback);
rv = ioMan->mIOThread->Dispatch(ev, priority
? CacheIOThread::OPEN_PRIORITY
: CacheIOThread::OPEN);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
CacheFileIOManager::OpenFileInternal(const SHA1Sum::Hash *aHash,
uint32_t aFlags,
CacheFileHandle **_retval)
{
nsresult rv;
if (mShuttingDown)
return NS_ERROR_NOT_INITIALIZED;
if (!mTreeCreated) {
rv = CreateCacheTree();
if (NS_FAILED(rv)) return rv;
}
nsCOMPtr<nsIFile> file;
rv = GetFile(aHash, getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
nsRefPtr<CacheFileHandle> handle;
mHandles.GetHandle(aHash, getter_AddRefs(handle));
if (aFlags == CREATE_NEW) {
if (handle) {
rv = DoomFileInternal(handle);
NS_ENSURE_SUCCESS(rv, rv);
handle = nullptr;
}
rv = mHandles.NewHandle(aHash, aFlags & PRIORITY, getter_AddRefs(handle));
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)) {
NS_WARNING("Cannot remove old entry from the disk");
// TODO log
}
}
handle->mFile.swap(file);
handle->mFileSize = 0;
}
if (handle) {
handle.swap(*_retval);
return NS_OK;
}
bool exists;
rv = file->Exists(&exists);
NS_ENSURE_SUCCESS(rv, rv);
if (!exists && aFlags == OPEN)
return NS_ERROR_NOT_AVAILABLE;
rv = mHandles.NewHandle(aHash, aFlags & PRIORITY, getter_AddRefs(handle));
NS_ENSURE_SUCCESS(rv, rv);
if (exists) {
rv = file->GetFileSize(&handle->mFileSize);
NS_ENSURE_SUCCESS(rv, rv);
handle->mFileExists = true;
}
else {
handle->mFileSize = 0;
}
handle->mFile.swap(file);
handle.swap(*_retval);
return NS_OK;
}
nsresult
CacheFileIOManager::CloseHandle(CacheFileHandle *aHandle)
{
LOG(("CacheFileIOManager::CloseHandle() [handle=%p]", aHandle));
nsresult rv;
CacheFileIOManager *ioMan = gInstance;
if (aHandle->IsClosed() || !ioMan)
return NS_ERROR_NOT_INITIALIZED;
nsRefPtr<CloseHandleEvent> ev = new CloseHandleEvent(aHandle);
rv = ioMan->mIOThread->Dispatch(ev, CacheIOThread::CLOSE);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
CacheFileIOManager::CloseHandleInternal(CacheFileHandle *aHandle)
{
// This method should be called only from CloseHandleEvent. If this handle is
// still unused then mRefCnt should be 2 (reference in hashtable and in
// CacheHandleEvent)
if (aHandle->mRefCnt != 2) {
// someone got this handle between calls to CloseHandle() and
// CloseHandleInternal()
return NS_OK;
}
// We're going to remove this handle, don't call CloseHandle() again
aHandle->mRemovingHandle = true;
// Close file handle
if (aHandle->mFD) {
ReleaseNSPRHandleInternal(aHandle);
}
// If the entry was doomed delete the file
if (aHandle->IsDoomed()) {
aHandle->mFile->Remove(false);
}
// Remove the handle from hashtable
mHandles.RemoveHandle(aHandle);
return NS_OK;
}
nsresult
CacheFileIOManager::Read(CacheFileHandle *aHandle, int64_t aOffset,
char *aBuf, int32_t aCount,
CacheFileIOListener *aCallback)
{
LOG(("CacheFileIOManager::Read() [handle=%p, offset=%lld, count=%d, "
"listener=%p]", aHandle, aOffset, aCount, aCallback));
nsresult rv;
CacheFileIOManager *ioMan = gInstance;
if (aHandle->IsClosed() || !ioMan)
return NS_ERROR_NOT_INITIALIZED;
nsRefPtr<ReadEvent> ev = new ReadEvent(aHandle, aOffset, aBuf, aCount,
aCallback);
rv = ioMan->mIOThread->Dispatch(ev, aHandle->IsPriority()
? CacheIOThread::READ_PRIORITY
: CacheIOThread::READ);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
CacheFileIOManager::ReadInternal(CacheFileHandle *aHandle, int64_t aOffset,
char *aBuf, int32_t aCount)
{
nsresult rv;
if (!aHandle->mFileExists) {
NS_WARNING("Trying to read from non-existent file");
return NS_ERROR_NOT_AVAILABLE;
}
if (!aHandle->mFD) {
rv = OpenNSPRHandle(aHandle);
NS_ENSURE_SUCCESS(rv, rv);
}
else {
NSPRHandleUsed(aHandle);
}
// Check again, OpenNSPRHandle could figure out the file was gone.
if (!aHandle->mFileExists) {
NS_WARNING("Trying to read from non-existent file");
return NS_ERROR_NOT_AVAILABLE;
}
int64_t offset = PR_Seek64(aHandle->mFD, aOffset, PR_SEEK_SET);
if (offset == -1)
return NS_ERROR_FAILURE;
int32_t bytesRead = PR_Read(aHandle->mFD, aBuf, aCount);
if (bytesRead != aCount)
return NS_ERROR_FAILURE;
return NS_OK;
}
nsresult
CacheFileIOManager::Write(CacheFileHandle *aHandle, int64_t aOffset,
const char *aBuf, int32_t aCount, bool aValidate,
CacheFileIOListener *aCallback)
{
LOG(("CacheFileIOManager::Write() [handle=%p, offset=%lld, count=%d, "
"validate=%d, listener=%p]", aHandle, aOffset, aCount, aValidate,
aCallback));
nsresult rv;
CacheFileIOManager *ioMan = gInstance;
if (aHandle->IsClosed() || !ioMan)
return NS_ERROR_NOT_INITIALIZED;
nsRefPtr<WriteEvent> ev = new WriteEvent(aHandle, aOffset, aBuf, aCount,
aValidate, aCallback);
rv = ioMan->mIOThread->Dispatch(ev, CacheIOThread::WRITE);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
CacheFileIOManager::WriteInternal(CacheFileHandle *aHandle, int64_t aOffset,
const char *aBuf, int32_t aCount,
bool aValidate)
{
nsresult rv;
if (!aHandle->mFileExists) {
rv = CreateFile(aHandle);
NS_ENSURE_SUCCESS(rv, rv);
}
if (!aHandle->mFD) {
rv = OpenNSPRHandle(aHandle);
NS_ENSURE_SUCCESS(rv, rv);
}
else {
NSPRHandleUsed(aHandle);
}
// Check again, OpenNSPRHandle could figure out the file was gone.
if (!aHandle->mFileExists) {
return NS_ERROR_NOT_AVAILABLE;
}
// Write invalidates the entry by default
aHandle->mInvalid = true;
int64_t offset = PR_Seek64(aHandle->mFD, aOffset, PR_SEEK_SET);
if (offset == -1)
return NS_ERROR_FAILURE;
int32_t bytesWritten = PR_Write(aHandle->mFD, aBuf, aCount);
if (bytesWritten != -1 && aHandle->mFileSize < aOffset+bytesWritten)
aHandle->mFileSize = aOffset+bytesWritten;
if (bytesWritten != aCount)
return NS_ERROR_FAILURE;
// Write was successful and this write validates the entry (i.e. metadata)
if (aValidate)
aHandle->mInvalid = false;
return NS_OK;
}
nsresult
CacheFileIOManager::DoomFile(CacheFileHandle *aHandle,
CacheFileIOListener *aCallback)
{
LOG(("CacheFileIOManager::DoomFile() [handle=%p, listener=%p]",
aHandle, aCallback));
nsresult rv;
CacheFileIOManager *ioMan = gInstance;
if (aHandle->IsClosed() || !ioMan)
return NS_ERROR_NOT_INITIALIZED;
nsRefPtr<DoomFileEvent> ev = new DoomFileEvent(aHandle, aCallback);
rv = ioMan->mIOThread->Dispatch(ev, aHandle->IsPriority()
? CacheIOThread::DOOM_PRIORITY
: CacheIOThread::DOOM);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
CacheFileIOManager::DoomFileInternal(CacheFileHandle *aHandle)
{
nsresult rv;
if (aHandle->IsDoomed())
return NS_OK;
if (aHandle->mFileExists) {
// we need to move the current file to the doomed directory
if (aHandle->mFD)
ReleaseNSPRHandleInternal(aHandle);
// find unused filename
nsCOMPtr<nsIFile> file;
rv = GetDoomedFile(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIFile> parentDir;
rv = file->GetParent(getter_AddRefs(parentDir));
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString leafName;
rv = file->GetNativeLeafName(leafName);
NS_ENSURE_SUCCESS(rv, rv);
rv = aHandle->mFile->MoveToNative(parentDir, leafName);
if (NS_ERROR_FILE_NOT_FOUND == rv || NS_ERROR_FILE_TARGET_DOES_NOT_EXIST == rv) {
LOG((" file already removed under our hands"));
aHandle->mFileExists = false;
rv = NS_OK;
}
else {
NS_ENSURE_SUCCESS(rv, rv);
aHandle->mFile.swap(file);
}
}
aHandle->mIsDoomed = true;
return NS_OK;
}
nsresult
CacheFileIOManager::DoomFileByKey(const nsACString &aKey,
CacheFileIOListener *aCallback)
{
LOG(("CacheFileIOManager::DoomFileByKey() [key=%s, listener=%p]",
PromiseFlatCString(aKey).get(), aCallback));
nsresult rv;
CacheFileIOManager *ioMan = gInstance;
if (!ioMan)
return NS_ERROR_NOT_INITIALIZED;
nsRefPtr<DoomFileByKeyEvent> ev = new DoomFileByKeyEvent(aKey, aCallback);
rv = ioMan->mIOThread->Dispatch(ev, nsIEventTarget::DISPATCH_NORMAL);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
CacheFileIOManager::DoomFileByKeyInternal(const SHA1Sum::Hash *aHash)
{
nsresult rv;
if (mShuttingDown)
return NS_ERROR_NOT_INITIALIZED;
if (!mCacheDirectory)
return NS_ERROR_FILE_INVALID_PATH;
// Find active handle
nsRefPtr<CacheFileHandle> handle;
mHandles.GetHandle(aHash, getter_AddRefs(handle));
if (handle) {
if (handle->IsDoomed())
return NS_OK;
return DoomFileInternal(handle);
}
// There is no handle for this file, delete the file if exists
nsCOMPtr<nsIFile> file;
rv = GetFile(aHash, getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
bool exists;
rv = file->Exists(&exists);
NS_ENSURE_SUCCESS(rv, rv);
if (!exists)
return NS_ERROR_NOT_AVAILABLE;
rv = file->Remove(false);
if (NS_FAILED(rv)) {
NS_WARNING("Cannot remove old entry from the disk");
// TODO log
}
return NS_OK;
}
nsresult
CacheFileIOManager::ReleaseNSPRHandle(CacheFileHandle *aHandle)
{
LOG(("CacheFileIOManager::ReleaseNSPRHandle() [handle=%p]", aHandle));
nsresult rv;
CacheFileIOManager *ioMan = gInstance;
if (aHandle->IsClosed() || !ioMan)
return NS_ERROR_NOT_INITIALIZED;
nsRefPtr<ReleaseNSPRHandleEvent> ev = new ReleaseNSPRHandleEvent(aHandle);
rv = ioMan->mIOThread->Dispatch(ev, CacheIOThread::CLOSE);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
CacheFileIOManager::ReleaseNSPRHandleInternal(CacheFileHandle *aHandle)
{
MOZ_ASSERT(aHandle->mFD);
DebugOnly<bool> found;
found = mHandlesByLastUsed.RemoveElement(aHandle);
MOZ_ASSERT(found);
PR_Close(aHandle->mFD);
aHandle->mFD = nullptr;
return NS_OK;
}
nsresult
CacheFileIOManager::TruncateSeekSetEOF(CacheFileHandle *aHandle,
int64_t aTruncatePos, int64_t aEOFPos,
CacheFileIOListener *aCallback)
{
LOG(("CacheFileIOManager::TruncateSeekSetEOF() [handle=%p, truncatePos=%lld, "
"EOFPos=%lld, listener=%p]", aHandle, aTruncatePos, aEOFPos, aCallback));
nsresult rv;
CacheFileIOManager *ioMan = gInstance;
if (aHandle->IsClosed() || !ioMan)
return NS_ERROR_NOT_INITIALIZED;
nsRefPtr<TruncateSeekSetEOFEvent> ev = new TruncateSeekSetEOFEvent(
aHandle, aTruncatePos, aEOFPos,
aCallback);
rv = ioMan->mIOThread->Dispatch(ev, CacheIOThread::WRITE);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
CacheFileIOManager::EnumerateEntryFiles(EEnumerateMode aMode,
CacheEntriesEnumerator** aEnumerator)
{
LOG(("CacheFileIOManager::EnumerateEntryFiles(%d)", aMode));
nsresult rv;
CacheFileIOManager *ioMan = gInstance;
if (!ioMan)
return NS_ERROR_NOT_INITIALIZED;
if (!ioMan->mCacheDirectory)
return NS_ERROR_FILE_NOT_FOUND;
nsCOMPtr<nsIFile> file;
rv = ioMan->mCacheDirectory->Clone(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
switch (aMode) {
case ENTRIES:
rv = file->AppendNative(NS_LITERAL_CSTRING("entries"));
NS_ENSURE_SUCCESS(rv, rv);
break;
case DOOMED:
rv = file->AppendNative(NS_LITERAL_CSTRING("doomed"));
NS_ENSURE_SUCCESS(rv, rv);
break;
default:
return NS_ERROR_INVALID_ARG;
}
nsAutoPtr<CacheEntriesEnumerator> enumerator(
new CacheEntriesEnumerator(file));
rv = enumerator->Init();
NS_ENSURE_SUCCESS(rv, rv);
*aEnumerator = enumerator.forget();
return NS_OK;
}
static nsresult
TruncFile(PRFileDesc *aFD, uint32_t aEOF)
{
#if defined(XP_UNIX)
if (ftruncate(PR_FileDesc2NativeHandle(aFD), aEOF) != 0) {
NS_ERROR("ftruncate failed");
return NS_ERROR_FAILURE;
}
#elif defined(XP_WIN)
int32_t cnt = PR_Seek(aFD, aEOF, PR_SEEK_SET);
if (cnt == -1)
return NS_ERROR_FAILURE;
if (!SetEndOfFile((HANDLE) PR_FileDesc2NativeHandle(aFD))) {
NS_ERROR("SetEndOfFile failed");
return NS_ERROR_FAILURE;
}
#elif defined(XP_OS2)
if (DosSetFileSize((HFILE) PR_FileDesc2NativeHandle(aFD), aEOF) != NO_ERROR) {
NS_ERROR("DosSetFileSize failed");
return NS_ERROR_FAILURE;
}
#else
MOZ_ASSERT(false, "Not implemented!");
#endif
return NS_OK;
}
nsresult
CacheFileIOManager::TruncateSeekSetEOFInternal(CacheFileHandle *aHandle,
int64_t aTruncatePos,
int64_t aEOFPos)
{
nsresult rv;
if (!aHandle->mFileExists) {
rv = CreateFile(aHandle);
NS_ENSURE_SUCCESS(rv, rv);
}
if (!aHandle->mFD) {
rv = OpenNSPRHandle(aHandle);
NS_ENSURE_SUCCESS(rv, rv);
}
else {
NSPRHandleUsed(aHandle);
}
// Check again, OpenNSPRHandle could figure out the file was gone.
if (!aHandle->mFileExists) {
return NS_ERROR_NOT_AVAILABLE;
}
// This operation always invalidates the entry
aHandle->mInvalid = true;
rv = TruncFile(aHandle->mFD, static_cast<uint32_t>(aTruncatePos));
NS_ENSURE_SUCCESS(rv, rv);
rv = TruncFile(aHandle->mFD, static_cast<uint32_t>(aEOFPos));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
CacheFileIOManager::CreateFile(CacheFileHandle *aHandle)
{
MOZ_ASSERT(!aHandle->mFD);
nsresult rv;
nsCOMPtr<nsIFile> file;
if (aHandle->IsDoomed()) {
rv = GetDoomedFile(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
} else {
rv = GetFile(aHandle->Hash(), getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
bool exists;
if (NS_SUCCEEDED(file->Exists(&exists)) && exists) {
NS_WARNING("Found a file that should not exist!");
}
}
rv = OpenNSPRHandle(aHandle, true);
NS_ENSURE_SUCCESS(rv, rv);
aHandle->mFileSize = 0;
return NS_OK;
}
void
CacheFileIOManager::GetHashStr(const SHA1Sum::Hash *aHash, nsACString &_retval)
{
_retval.Assign("");
const char hexChars[] = {'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
for (uint32_t i=0 ; i<sizeof(SHA1Sum::Hash) ; i++) {
_retval.Append(hexChars[(*aHash)[i] >> 4]);
_retval.Append(hexChars[(*aHash)[i] & 0xF]);
}
}
nsresult
CacheFileIOManager::GetFile(const SHA1Sum::Hash *aHash, nsIFile **_retval)
{
nsresult rv;
nsCOMPtr<nsIFile> file;
rv = mCacheDirectory->Clone(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
rv = file->AppendNative(NS_LITERAL_CSTRING("entries"));
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString leafName;
GetHashStr(aHash, leafName);
rv = file->AppendNative(leafName);
NS_ENSURE_SUCCESS(rv, rv);
file.swap(*_retval);
return NS_OK;
}
nsresult
CacheFileIOManager::GetDoomedFile(nsIFile **_retval)
{
nsresult rv;
nsCOMPtr<nsIFile> file;
rv = mCacheDirectory->Clone(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
rv = file->AppendNative(NS_LITERAL_CSTRING("doomed"));
NS_ENSURE_SUCCESS(rv, rv);
rv = file->AppendNative(NS_LITERAL_CSTRING("dummyleaf"));
NS_ENSURE_SUCCESS(rv, rv);
srand(static_cast<unsigned>(PR_Now()));
nsAutoCString leafName;
uint32_t iter=0;
while (true) {
iter++;
leafName.AppendInt(rand());
rv = file->SetNativeLeafName(leafName);
NS_ENSURE_SUCCESS(rv, rv);
bool exists;
if (NS_SUCCEEDED(file->Exists(&exists)) && !exists)
break;
leafName.Truncate();
}
// Telemetry::Accumulate(Telemetry::DISK_CACHE_GETDOOMEDFILE_ITERATIONS, iter);
file.swap(*_retval);
return NS_OK;
}
nsresult
CacheFileIOManager::CheckAndCreateDir(nsIFile *aFile, const char *aDir)
{
nsresult rv;
bool exists;
nsCOMPtr<nsIFile> file;
if (!aDir) {
file = aFile;
} else {
nsAutoCString dir(aDir);
rv = aFile->Clone(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
rv = file->AppendNative(dir);
NS_ENSURE_SUCCESS(rv, rv);
}
rv = file->Exists(&exists);
if (NS_SUCCEEDED(rv) && !exists)
rv = file->Create(nsIFile::DIRECTORY_TYPE, 0700);
if (NS_FAILED(rv)) {
NS_WARNING("Cannot create directory");
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult
CacheFileIOManager::CreateCacheTree()
{
MOZ_ASSERT(!mTreeCreated);
if (!mCacheDirectory)
return NS_ERROR_FILE_INVALID_PATH;
nsresult rv;
// ensure parent directory exists
nsCOMPtr<nsIFile> parentDir;
rv = mCacheDirectory->GetParent(getter_AddRefs(parentDir));
NS_ENSURE_SUCCESS(rv, rv);
rv = CheckAndCreateDir(parentDir, nullptr);
NS_ENSURE_SUCCESS(rv, rv);
// ensure cache directory exists
rv = CheckAndCreateDir(mCacheDirectory, nullptr);
NS_ENSURE_SUCCESS(rv, rv);
// ensure entries directory exists
rv = CheckAndCreateDir(mCacheDirectory, "entries");
NS_ENSURE_SUCCESS(rv, rv);
// ensure doomed directory exists
rv = CheckAndCreateDir(mCacheDirectory, "doomed");
NS_ENSURE_SUCCESS(rv, rv);
mTreeCreated = true;
return NS_OK;
}
nsresult
CacheFileIOManager::OpenNSPRHandle(CacheFileHandle *aHandle, bool aCreate)
{
MOZ_ASSERT(!aHandle->mFD);
MOZ_ASSERT(mHandlesByLastUsed.IndexOf(aHandle) == mHandlesByLastUsed.NoIndex);
MOZ_ASSERT(mHandlesByLastUsed.Length() <= kOpenHandlesLimit);
nsresult rv;
if (mHandlesByLastUsed.Length() == kOpenHandlesLimit) {
// close handle that hasn't been used for the longest time
rv = ReleaseNSPRHandleInternal(mHandlesByLastUsed[0]);
NS_ENSURE_SUCCESS(rv, rv);
}
if (aCreate) {
rv = aHandle->mFile->OpenNSPRFileDesc(
PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE, 0600, &aHandle->mFD);
NS_ENSURE_SUCCESS(rv, rv);
aHandle->mFileExists = true;
}
else {
rv = aHandle->mFile->OpenNSPRFileDesc(PR_RDWR, 0600, &aHandle->mFD);
if (NS_ERROR_FILE_NOT_FOUND == rv) {
LOG((" file doesn't exists"));
aHandle->mFileExists = false;
aHandle->mIsDoomed = true;
return NS_OK;
}
NS_ENSURE_SUCCESS(rv, rv);
}
mHandlesByLastUsed.AppendElement(aHandle);
return NS_OK;
}
void
CacheFileIOManager::NSPRHandleUsed(CacheFileHandle *aHandle)
{
MOZ_ASSERT(aHandle->mFD);
DebugOnly<bool> found;
found = mHandlesByLastUsed.RemoveElement(aHandle);
MOZ_ASSERT(found);
mHandlesByLastUsed.AppendElement(aHandle);
}
} // net
} // mozilla
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