зеркало из https://github.com/mozilla/gecko-dev.git
633 строки
14 KiB
C++
633 строки
14 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "CacheLog.h"
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#include "CacheFileChunk.h"
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#include "CacheFile.h"
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#include "nsThreadUtils.h"
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namespace mozilla {
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namespace net {
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#define kMinBufSize 512
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class NotifyUpdateListenerEvent : public nsRunnable {
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public:
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NotifyUpdateListenerEvent(CacheFileChunkListener *aCallback,
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CacheFileChunk *aChunk)
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: mCallback(aCallback)
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, mChunk(aChunk)
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{
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LOG(("NotifyUpdateListenerEvent::NotifyUpdateListenerEvent() [this=%p]",
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this));
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MOZ_COUNT_CTOR(NotifyUpdateListenerEvent);
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}
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~NotifyUpdateListenerEvent()
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{
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LOG(("NotifyUpdateListenerEvent::~NotifyUpdateListenerEvent() [this=%p]",
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this));
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MOZ_COUNT_DTOR(NotifyUpdateListenerEvent);
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}
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NS_IMETHOD Run()
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{
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LOG(("NotifyUpdateListenerEvent::Run() [this=%p]", this));
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mCallback->OnChunkUpdated(mChunk);
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return NS_OK;
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}
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protected:
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nsCOMPtr<CacheFileChunkListener> mCallback;
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nsRefPtr<CacheFileChunk> mChunk;
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};
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NS_IMPL_ADDREF(CacheFileChunk)
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NS_IMETHODIMP_(MozExternalRefCountType)
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CacheFileChunk::Release()
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{
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NS_PRECONDITION(0 != mRefCnt, "dup release");
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nsrefcnt count = --mRefCnt;
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NS_LOG_RELEASE(this, count, "CacheFileChunk");
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if (0 == count) {
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mRefCnt = 1;
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delete (this);
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return 0;
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}
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if (!mRemovingChunk && count == 1) {
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mFile->RemoveChunk(this);
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}
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return count;
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}
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NS_INTERFACE_MAP_BEGIN(CacheFileChunk)
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NS_INTERFACE_MAP_ENTRY(mozilla::net::CacheFileIOListener)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END_THREADSAFE
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CacheFileChunk::CacheFileChunk(CacheFile *aFile, uint32_t aIndex)
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: CacheMemoryConsumer(aFile->mOpenAsMemoryOnly ? MEMORY_ONLY : DONT_REPORT)
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, mIndex(aIndex)
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, mState(INITIAL)
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, mStatus(NS_OK)
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, mIsDirty(false)
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, mRemovingChunk(false)
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, mDataSize(0)
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, mBuf(nullptr)
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, mBufSize(0)
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, mRWBuf(nullptr)
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, mRWBufSize(0)
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, mReadHash(0)
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, mFile(aFile)
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{
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LOG(("CacheFileChunk::CacheFileChunk() [this=%p]", this));
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MOZ_COUNT_CTOR(CacheFileChunk);
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}
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CacheFileChunk::~CacheFileChunk()
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{
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LOG(("CacheFileChunk::~CacheFileChunk() [this=%p]", this));
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MOZ_COUNT_DTOR(CacheFileChunk);
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if (mBuf) {
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free(mBuf);
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mBuf = nullptr;
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mBufSize = 0;
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}
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if (mRWBuf) {
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free(mRWBuf);
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mRWBuf = nullptr;
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mRWBufSize = 0;
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}
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}
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void
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CacheFileChunk::InitNew(CacheFileChunkListener *aCallback)
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{
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mFile->AssertOwnsLock();
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LOG(("CacheFileChunk::InitNew() [this=%p, listener=%p]", this, aCallback));
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MOZ_ASSERT(mState == INITIAL);
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MOZ_ASSERT(!mBuf);
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MOZ_ASSERT(!mRWBuf);
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mBuf = static_cast<char *>(moz_xmalloc(kMinBufSize));
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mBufSize = kMinBufSize;
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mDataSize = 0;
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mState = READY;
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mIsDirty = true;
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DoMemoryReport(MemorySize());
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}
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nsresult
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CacheFileChunk::Read(CacheFileHandle *aHandle, uint32_t aLen,
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CacheHash::Hash16_t aHash,
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CacheFileChunkListener *aCallback)
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{
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mFile->AssertOwnsLock();
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LOG(("CacheFileChunk::Read() [this=%p, handle=%p, len=%d, listener=%p]",
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this, aHandle, aLen, aCallback));
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MOZ_ASSERT(mState == INITIAL);
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MOZ_ASSERT(!mBuf);
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MOZ_ASSERT(!mRWBuf);
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MOZ_ASSERT(aLen);
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nsresult rv;
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mRWBuf = static_cast<char *>(moz_xmalloc(aLen));
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mRWBufSize = aLen;
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DoMemoryReport(MemorySize());
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rv = CacheFileIOManager::Read(aHandle, mIndex * kChunkSize, mRWBuf, aLen,
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true, this);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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rv = mIndex ? NS_ERROR_FILE_CORRUPTED : NS_ERROR_FILE_NOT_FOUND;
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SetError(rv);
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} else {
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mState = READING;
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mListener = aCallback;
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mDataSize = aLen;
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mReadHash = aHash;
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}
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return rv;
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}
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nsresult
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CacheFileChunk::Write(CacheFileHandle *aHandle,
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CacheFileChunkListener *aCallback)
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{
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mFile->AssertOwnsLock();
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LOG(("CacheFileChunk::Write() [this=%p, handle=%p, listener=%p]",
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this, aHandle, aCallback));
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MOZ_ASSERT(mState == READY);
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MOZ_ASSERT(!mRWBuf);
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MOZ_ASSERT(mBuf);
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MOZ_ASSERT(mDataSize); // Don't write chunk when it is empty
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nsresult rv;
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mRWBuf = mBuf;
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mRWBufSize = mBufSize;
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mBuf = nullptr;
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mBufSize = 0;
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rv = CacheFileIOManager::Write(aHandle, mIndex * kChunkSize, mRWBuf,
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mDataSize, false, this);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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SetError(rv);
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} else {
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mState = WRITING;
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mListener = aCallback;
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mIsDirty = false;
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}
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return rv;
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}
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void
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CacheFileChunk::WaitForUpdate(CacheFileChunkListener *aCallback)
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{
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mFile->AssertOwnsLock();
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LOG(("CacheFileChunk::WaitForUpdate() [this=%p, listener=%p]",
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this, aCallback));
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MOZ_ASSERT(mFile->mOutput);
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MOZ_ASSERT(IsReady());
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#ifdef DEBUG
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for (uint32_t i = 0 ; i < mUpdateListeners.Length() ; i++) {
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MOZ_ASSERT(mUpdateListeners[i]->mCallback != aCallback);
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}
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#endif
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ChunkListenerItem *item = new ChunkListenerItem();
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item->mTarget = NS_GetCurrentThread();
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item->mCallback = aCallback;
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mUpdateListeners.AppendElement(item);
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}
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nsresult
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CacheFileChunk::CancelWait(CacheFileChunkListener *aCallback)
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{
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mFile->AssertOwnsLock();
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LOG(("CacheFileChunk::CancelWait() [this=%p, listener=%p]", this, aCallback));
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MOZ_ASSERT(IsReady());
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uint32_t i;
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for (i = 0 ; i < mUpdateListeners.Length() ; i++) {
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ChunkListenerItem *item = mUpdateListeners[i];
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if (item->mCallback == aCallback) {
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mUpdateListeners.RemoveElementAt(i);
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delete item;
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break;
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}
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}
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#ifdef DEBUG
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for ( ; i < mUpdateListeners.Length() ; i++) {
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MOZ_ASSERT(mUpdateListeners[i]->mCallback != aCallback);
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}
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#endif
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return NS_OK;
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}
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nsresult
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CacheFileChunk::NotifyUpdateListeners()
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{
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mFile->AssertOwnsLock();
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LOG(("CacheFileChunk::NotifyUpdateListeners() [this=%p]", this));
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MOZ_ASSERT(IsReady());
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nsresult rv, rv2;
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rv = NS_OK;
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for (uint32_t i = 0 ; i < mUpdateListeners.Length() ; i++) {
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ChunkListenerItem *item = mUpdateListeners[i];
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LOG(("CacheFileChunk::NotifyUpdateListeners() - Notifying listener %p "
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"[this=%p]", item->mCallback.get(), this));
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nsRefPtr<NotifyUpdateListenerEvent> ev;
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ev = new NotifyUpdateListenerEvent(item->mCallback, this);
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rv2 = item->mTarget->Dispatch(ev, NS_DISPATCH_NORMAL);
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if (NS_FAILED(rv2) && NS_SUCCEEDED(rv))
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rv = rv2;
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delete item;
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}
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mUpdateListeners.Clear();
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return rv;
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}
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uint32_t
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CacheFileChunk::Index()
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{
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return mIndex;
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}
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CacheHash::Hash16_t
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CacheFileChunk::Hash()
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{
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mFile->AssertOwnsLock();
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MOZ_ASSERT(mBuf);
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MOZ_ASSERT(!mListener);
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MOZ_ASSERT(IsReady());
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return CacheHash::Hash16(BufForReading(), mDataSize);
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}
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uint32_t
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CacheFileChunk::DataSize()
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{
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mFile->AssertOwnsLock();
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return mDataSize;
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}
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void
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CacheFileChunk::UpdateDataSize(uint32_t aOffset, uint32_t aLen, bool aEOF)
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{
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mFile->AssertOwnsLock();
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MOZ_ASSERT(!aEOF, "Implement me! What to do with opened streams?");
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MOZ_ASSERT(aOffset <= mDataSize);
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MOZ_ASSERT(aLen != 0);
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// UpdateDataSize() is called only when we've written some data to the chunk
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// and we never write data anymore once some error occurs.
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MOZ_ASSERT(mState != ERROR);
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LOG(("CacheFileChunk::UpdateDataSize() [this=%p, offset=%d, len=%d, EOF=%d]",
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this, aOffset, aLen, aEOF));
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mIsDirty = true;
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int64_t fileSize = kChunkSize * mIndex + aOffset + aLen;
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bool notify = false;
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if (fileSize > mFile->mDataSize)
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mFile->mDataSize = fileSize;
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if (aOffset + aLen > mDataSize) {
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mDataSize = aOffset + aLen;
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notify = true;
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}
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if (mState == READY || mState == WRITING) {
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MOZ_ASSERT(mValidityMap.Length() == 0);
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if (notify) {
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NotifyUpdateListeners();
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}
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return;
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}
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// We're still waiting for data from the disk. This chunk cannot be used by
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// input stream, so there must be no update listener. We also need to keep
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// track of where the data is written so that we can correctly merge the new
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// data with the old one.
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MOZ_ASSERT(mUpdateListeners.Length() == 0);
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MOZ_ASSERT(mState == READING);
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mValidityMap.AddPair(aOffset, aLen);
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mValidityMap.Log();
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}
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nsresult
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CacheFileChunk::OnFileOpened(CacheFileHandle *aHandle, nsresult aResult)
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{
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MOZ_CRASH("CacheFileChunk::OnFileOpened should not be called!");
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return NS_ERROR_UNEXPECTED;
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}
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nsresult
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CacheFileChunk::OnDataWritten(CacheFileHandle *aHandle, const char *aBuf,
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nsresult aResult)
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{
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LOG(("CacheFileChunk::OnDataWritten() [this=%p, handle=%p, result=0x%08x]",
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this, aHandle, aResult));
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nsCOMPtr<CacheFileChunkListener> listener;
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{
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CacheFileAutoLock lock(mFile);
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MOZ_ASSERT(mState == WRITING);
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MOZ_ASSERT(mListener);
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if (NS_WARN_IF(NS_FAILED(aResult))) {
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SetError(aResult);
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} else {
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mState = READY;
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}
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if (!mBuf) {
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mBuf = mRWBuf;
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mBufSize = mRWBufSize;
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} else {
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free(mRWBuf);
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}
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mRWBuf = nullptr;
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mRWBufSize = 0;
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DoMemoryReport(MemorySize());
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mListener.swap(listener);
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}
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listener->OnChunkWritten(aResult, this);
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return NS_OK;
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}
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nsresult
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CacheFileChunk::OnDataRead(CacheFileHandle *aHandle, char *aBuf,
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nsresult aResult)
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{
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LOG(("CacheFileChunk::OnDataRead() [this=%p, handle=%p, result=0x%08x]",
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this, aHandle, aResult));
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nsCOMPtr<CacheFileChunkListener> listener;
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{
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CacheFileAutoLock lock(mFile);
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MOZ_ASSERT(mState == READING);
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MOZ_ASSERT(mListener);
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if (NS_SUCCEEDED(aResult)) {
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CacheHash::Hash16_t hash = CacheHash::Hash16(mRWBuf, mRWBufSize);
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if (hash != mReadHash) {
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LOG(("CacheFileChunk::OnDataRead() - Hash mismatch! Hash of the data is"
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" %hx, hash in metadata is %hx. [this=%p, idx=%d]",
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hash, mReadHash, this, mIndex));
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aResult = NS_ERROR_FILE_CORRUPTED;
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}
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else {
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if (!mBuf) {
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// Just swap the buffers if we don't have mBuf yet
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MOZ_ASSERT(mDataSize == mRWBufSize);
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mBuf = mRWBuf;
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mBufSize = mRWBufSize;
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mRWBuf = nullptr;
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mRWBufSize = 0;
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} else {
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LOG(("CacheFileChunk::OnDataRead() - Merging buffers. [this=%p]",
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this));
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// Merge data with write buffer
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if (mRWBufSize < mBufSize) {
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mRWBuf = static_cast<char *>(moz_xrealloc(mRWBuf, mBufSize));
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mRWBufSize = mBufSize;
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}
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mValidityMap.Log();
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for (uint32_t i = 0 ; i < mValidityMap.Length() ; i++) {
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memcpy(mRWBuf + mValidityMap[i].Offset(),
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mBuf + mValidityMap[i].Offset(), mValidityMap[i].Len());
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}
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mValidityMap.Clear();
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free(mBuf);
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mBuf = mRWBuf;
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mBufSize = mRWBufSize;
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mRWBuf = nullptr;
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mRWBufSize = 0;
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DoMemoryReport(MemorySize());
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}
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}
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}
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if (NS_FAILED(aResult)) {
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aResult = mIndex ? NS_ERROR_FILE_CORRUPTED : NS_ERROR_FILE_NOT_FOUND;
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SetError(aResult);
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mDataSize = 0;
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} else {
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mState = READY;
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}
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mListener.swap(listener);
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}
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listener->OnChunkRead(aResult, this);
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return NS_OK;
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}
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nsresult
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CacheFileChunk::OnFileDoomed(CacheFileHandle *aHandle, nsresult aResult)
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{
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MOZ_CRASH("CacheFileChunk::OnFileDoomed should not be called!");
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return NS_ERROR_UNEXPECTED;
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}
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nsresult
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CacheFileChunk::OnEOFSet(CacheFileHandle *aHandle, nsresult aResult)
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{
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MOZ_CRASH("CacheFileChunk::OnEOFSet should not be called!");
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return NS_ERROR_UNEXPECTED;
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}
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nsresult
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CacheFileChunk::OnFileRenamed(CacheFileHandle *aHandle, nsresult aResult)
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{
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MOZ_CRASH("CacheFileChunk::OnFileRenamed should not be called!");
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return NS_ERROR_UNEXPECTED;
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}
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bool
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CacheFileChunk::IsReady() const
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{
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mFile->AssertOwnsLock();
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return (NS_SUCCEEDED(mStatus) && (mState == READY || mState == WRITING));
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}
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bool
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CacheFileChunk::IsDirty() const
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{
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mFile->AssertOwnsLock();
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return mIsDirty;
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}
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nsresult
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CacheFileChunk::GetStatus()
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{
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mFile->AssertOwnsLock();
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return mStatus;
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}
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void
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CacheFileChunk::SetError(nsresult aStatus)
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{
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if (NS_SUCCEEDED(mStatus)) {
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MOZ_ASSERT(mState != ERROR);
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mStatus = aStatus;
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mState = ERROR;
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} else {
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MOZ_ASSERT(mState == ERROR);
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}
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}
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char *
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CacheFileChunk::BufForWriting() const
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{
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mFile->AssertOwnsLock();
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MOZ_ASSERT(mBuf); // Writer should always first call EnsureBufSize()
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MOZ_ASSERT((mState == READY && !mRWBuf) ||
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(mState == WRITING && mRWBuf) ||
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(mState == READING && mRWBuf));
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return mBuf;
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}
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const char *
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CacheFileChunk::BufForReading() const
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{
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mFile->AssertOwnsLock();
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MOZ_ASSERT((mState == READY && mBuf && !mRWBuf) ||
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(mState == WRITING && mRWBuf));
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return mBuf ? mBuf : mRWBuf;
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}
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void
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CacheFileChunk::EnsureBufSize(uint32_t aBufSize)
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{
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mFile->AssertOwnsLock();
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// EnsureBufSize() is called only when we want to write some data to the chunk
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// and we never write data anymore once some error occurs.
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MOZ_ASSERT(mState != ERROR);
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|
|
if (mBufSize >= aBufSize)
|
|
return;
|
|
|
|
bool copy = false;
|
|
if (!mBuf && mState == WRITING) {
|
|
// We need to duplicate the data that is being written on the background
|
|
// thread, so make sure that all the data fits into the new buffer.
|
|
copy = true;
|
|
|
|
if (mRWBufSize > aBufSize)
|
|
aBufSize = mRWBufSize;
|
|
}
|
|
|
|
// find smallest power of 2 greater than or equal to aBufSize
|
|
aBufSize--;
|
|
aBufSize |= aBufSize >> 1;
|
|
aBufSize |= aBufSize >> 2;
|
|
aBufSize |= aBufSize >> 4;
|
|
aBufSize |= aBufSize >> 8;
|
|
aBufSize |= aBufSize >> 16;
|
|
aBufSize++;
|
|
|
|
const uint32_t minBufSize = kMinBufSize;
|
|
const uint32_t maxBufSize = kChunkSize;
|
|
aBufSize = clamped(aBufSize, minBufSize, maxBufSize);
|
|
|
|
mBuf = static_cast<char *>(moz_xrealloc(mBuf, aBufSize));
|
|
mBufSize = aBufSize;
|
|
|
|
if (copy)
|
|
memcpy(mBuf, mRWBuf, mRWBufSize);
|
|
|
|
DoMemoryReport(MemorySize());
|
|
}
|
|
|
|
// Memory reporting
|
|
|
|
size_t
|
|
CacheFileChunk::SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const
|
|
{
|
|
size_t n = 0;
|
|
n += mallocSizeOf(mBuf);
|
|
n += mallocSizeOf(mRWBuf);
|
|
n += mValidityMap.SizeOfExcludingThis(mallocSizeOf);
|
|
|
|
return n;
|
|
}
|
|
|
|
size_t
|
|
CacheFileChunk::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
|
|
{
|
|
return mallocSizeOf(this) + SizeOfExcludingThis(mallocSizeOf);
|
|
}
|
|
|
|
} // net
|
|
} // mozilla
|