зеркало из https://github.com/mozilla/gecko-dev.git
470 строки
13 KiB
C++
470 строки
13 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 "CacheFileOutputStream.h"
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#include "CacheFile.h"
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#include "CacheEntry.h"
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#include "nsStreamUtils.h"
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#include "nsThreadUtils.h"
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#include "mozilla/DebugOnly.h"
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#include <algorithm>
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namespace mozilla::net {
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NS_IMPL_ADDREF(CacheFileOutputStream)
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NS_IMETHODIMP_(MozExternalRefCountType)
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CacheFileOutputStream::Release() {
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MOZ_ASSERT(0 != mRefCnt, "dup release");
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nsrefcnt count = --mRefCnt;
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NS_LOG_RELEASE(this, count, "CacheFileOutputStream");
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if (0 == count) {
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mRefCnt = 1;
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{
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CacheFileAutoLock lock(mFile);
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mFile->RemoveOutput(this, mStatus);
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}
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delete (this);
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return 0;
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}
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return count;
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}
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NS_INTERFACE_MAP_BEGIN(CacheFileOutputStream)
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NS_INTERFACE_MAP_ENTRY(nsIOutputStream)
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NS_INTERFACE_MAP_ENTRY(nsIAsyncOutputStream)
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NS_INTERFACE_MAP_ENTRY(nsISeekableStream)
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NS_INTERFACE_MAP_ENTRY(nsITellableStream)
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NS_INTERFACE_MAP_ENTRY(mozilla::net::CacheFileChunkListener)
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NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIOutputStream)
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NS_INTERFACE_MAP_END
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CacheFileOutputStream::CacheFileOutputStream(
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CacheFile* aFile, CacheOutputCloseListener* aCloseListener,
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bool aAlternativeData)
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: mFile(aFile),
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mCloseListener(aCloseListener),
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mPos(0),
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mClosed(false),
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mAlternativeData(aAlternativeData),
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mStatus(NS_OK),
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mCallbackFlags(0) {
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LOG(("CacheFileOutputStream::CacheFileOutputStream() [this=%p]", this));
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if (mAlternativeData) {
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mPos = mFile->mAltDataOffset;
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}
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}
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CacheFileOutputStream::~CacheFileOutputStream() {
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LOG(("CacheFileOutputStream::~CacheFileOutputStream() [this=%p]", this));
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}
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// nsIOutputStream
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NS_IMETHODIMP
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CacheFileOutputStream::Close() {
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LOG(("CacheFileOutputStream::Close() [this=%p]", this));
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return CloseWithStatus(NS_OK);
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}
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NS_IMETHODIMP
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CacheFileOutputStream::Flush() {
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// TODO do we need to implement flush ???
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LOG(("CacheFileOutputStream::Flush() [this=%p]", this));
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return NS_OK;
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}
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NS_IMETHODIMP
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CacheFileOutputStream::Write(const char* aBuf, uint32_t aCount,
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uint32_t* _retval) {
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CacheFileAutoLock lock(mFile);
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mFile->AssertOwnsLock(); // For thread-safety analysis
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LOG(("CacheFileOutputStream::Write() [this=%p, count=%d]", this, aCount));
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if (mClosed) {
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LOG(
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("CacheFileOutputStream::Write() - Stream is closed. [this=%p, "
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"status=0x%08" PRIx32 "]",
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this, static_cast<uint32_t>(mStatus)));
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return NS_FAILED(mStatus) ? mStatus : NS_BASE_STREAM_CLOSED;
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}
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if (!mFile->mSkipSizeCheck &&
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CacheObserver::EntryIsTooBig(mPos + aCount, !mFile->mMemoryOnly)) {
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LOG(("CacheFileOutputStream::Write() - Entry is too big. [this=%p]", this));
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CloseWithStatusLocked(NS_ERROR_FILE_TOO_BIG);
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return NS_ERROR_FILE_TOO_BIG;
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}
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// We use 64-bit offset when accessing the file, unfortunately we use 32-bit
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// metadata offset, so we cannot handle data bigger than 4GB.
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if (mPos + aCount > PR_UINT32_MAX) {
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LOG(("CacheFileOutputStream::Write() - Entry's size exceeds 4GB. [this=%p]",
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this));
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CloseWithStatusLocked(NS_ERROR_FILE_TOO_BIG);
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return NS_ERROR_FILE_TOO_BIG;
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}
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*_retval = aCount;
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while (aCount) {
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EnsureCorrectChunk(false);
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if (NS_FAILED(mStatus)) {
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return mStatus;
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}
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FillHole();
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if (NS_FAILED(mStatus)) {
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return mStatus;
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}
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uint32_t chunkOffset = mPos - (mPos / kChunkSize) * kChunkSize;
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uint32_t canWrite = kChunkSize - chunkOffset;
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uint32_t thisWrite = std::min(static_cast<uint32_t>(canWrite), aCount);
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CacheFileChunkWriteHandle hnd =
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mChunk->GetWriteHandle(chunkOffset + thisWrite);
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if (!hnd.Buf()) {
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CloseWithStatusLocked(NS_ERROR_OUT_OF_MEMORY);
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return NS_ERROR_OUT_OF_MEMORY;
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}
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memcpy(hnd.Buf() + chunkOffset, aBuf, thisWrite);
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hnd.UpdateDataSize(chunkOffset, thisWrite);
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mPos += thisWrite;
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aBuf += thisWrite;
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aCount -= thisWrite;
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}
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EnsureCorrectChunk(true);
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LOG(("CacheFileOutputStream::Write() - Wrote %d bytes [this=%p]", *_retval,
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this));
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return NS_OK;
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}
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NS_IMETHODIMP
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CacheFileOutputStream::WriteFrom(nsIInputStream* aFromStream, uint32_t aCount,
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uint32_t* _retval) {
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LOG(
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("CacheFileOutputStream::WriteFrom() - NOT_IMPLEMENTED [this=%p, from=%p"
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", count=%d]",
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this, aFromStream, aCount));
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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CacheFileOutputStream::WriteSegments(nsReadSegmentFun aReader, void* aClosure,
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uint32_t aCount, uint32_t* _retval) {
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LOG(
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("CacheFileOutputStream::WriteSegments() - NOT_IMPLEMENTED [this=%p, "
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"count=%d]",
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this, aCount));
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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CacheFileOutputStream::IsNonBlocking(bool* _retval) {
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*_retval = false;
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return NS_OK;
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}
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// nsIAsyncOutputStream
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NS_IMETHODIMP
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CacheFileOutputStream::CloseWithStatus(nsresult aStatus) {
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CacheFileAutoLock lock(mFile);
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LOG(("CacheFileOutputStream::CloseWithStatus() [this=%p, aStatus=0x%08" PRIx32
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"]",
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this, static_cast<uint32_t>(aStatus)));
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return CloseWithStatusLocked(aStatus);
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}
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nsresult CacheFileOutputStream::CloseWithStatusLocked(nsresult aStatus) {
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LOG(
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("CacheFileOutputStream::CloseWithStatusLocked() [this=%p, "
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"aStatus=0x%08" PRIx32 "]",
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this, static_cast<uint32_t>(aStatus)));
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if (mClosed) {
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MOZ_ASSERT(!mCallback);
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return NS_OK;
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}
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mClosed = true;
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mStatus = NS_FAILED(aStatus) ? aStatus : NS_BASE_STREAM_CLOSED;
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if (mChunk) {
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ReleaseChunk();
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}
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if (mCallback) {
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NotifyListener();
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}
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mFile->RemoveOutput(this, mStatus);
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return NS_OK;
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}
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NS_IMETHODIMP
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CacheFileOutputStream::AsyncWait(nsIOutputStreamCallback* aCallback,
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uint32_t aFlags, uint32_t aRequestedCount,
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nsIEventTarget* aEventTarget) {
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CacheFileAutoLock lock(mFile);
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LOG(
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("CacheFileOutputStream::AsyncWait() [this=%p, callback=%p, flags=%d, "
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"requestedCount=%d, eventTarget=%p]",
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this, aCallback, aFlags, aRequestedCount, aEventTarget));
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mCallback = aCallback;
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mCallbackFlags = aFlags;
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mCallbackTarget = aEventTarget;
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if (!mCallback) return NS_OK;
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// The stream is blocking so it is writable at any time
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if (mClosed || !(aFlags & WAIT_CLOSURE_ONLY)) NotifyListener();
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return NS_OK;
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}
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// nsISeekableStream
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NS_IMETHODIMP
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CacheFileOutputStream::Seek(int32_t whence, int64_t offset) {
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CacheFileAutoLock lock(mFile);
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mFile->AssertOwnsLock(); // For thread-safety analysis
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LOG(("CacheFileOutputStream::Seek() [this=%p, whence=%d, offset=%" PRId64 "]",
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this, whence, offset));
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if (mClosed) {
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LOG(("CacheFileOutputStream::Seek() - Stream is closed. [this=%p]", this));
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return NS_BASE_STREAM_CLOSED;
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}
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int64_t newPos = offset;
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switch (whence) {
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case NS_SEEK_SET:
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if (mAlternativeData) {
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newPos += mFile->mAltDataOffset;
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}
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break;
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case NS_SEEK_CUR:
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newPos += mPos;
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break;
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case NS_SEEK_END:
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if (mAlternativeData) {
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newPos += mFile->mDataSize;
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} else {
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newPos += mFile->mAltDataOffset;
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}
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break;
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default:
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NS_ERROR("invalid whence");
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return NS_ERROR_INVALID_ARG;
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}
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mPos = newPos;
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EnsureCorrectChunk(true);
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LOG(("CacheFileOutputStream::Seek() [this=%p, pos=%" PRId64 "]", this, mPos));
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return NS_OK;
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}
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NS_IMETHODIMP
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CacheFileOutputStream::SetEOF() {
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MOZ_ASSERT(false, "CacheFileOutputStream::SetEOF() not implemented");
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// Right now we don't use SetEOF(). If we ever need this method, we need
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// to think about what to do with input streams that already points beyond
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// new EOF.
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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// nsITellableStream
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NS_IMETHODIMP
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CacheFileOutputStream::Tell(int64_t* _retval) {
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CacheFileAutoLock lock(mFile);
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mFile->AssertOwnsLock(); // For thread-safety analysis
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if (mClosed) {
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LOG(("CacheFileOutputStream::Tell() - Stream is closed. [this=%p]", this));
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return NS_BASE_STREAM_CLOSED;
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}
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*_retval = mPos;
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if (mAlternativeData) {
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*_retval -= mFile->mAltDataOffset;
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}
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LOG(("CacheFileOutputStream::Tell() [this=%p, retval=%" PRId64 "]", this,
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*_retval));
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return NS_OK;
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}
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// CacheFileChunkListener
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nsresult CacheFileOutputStream::OnChunkRead(nsresult aResult,
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CacheFileChunk* aChunk) {
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MOZ_CRASH("CacheFileOutputStream::OnChunkRead should not be called!");
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return NS_ERROR_UNEXPECTED;
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}
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nsresult CacheFileOutputStream::OnChunkWritten(nsresult aResult,
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CacheFileChunk* aChunk) {
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MOZ_CRASH("CacheFileOutputStream::OnChunkWritten should not be called!");
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return NS_ERROR_UNEXPECTED;
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}
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nsresult CacheFileOutputStream::OnChunkAvailable(nsresult aResult,
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uint32_t aChunkIdx,
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CacheFileChunk* aChunk) {
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MOZ_CRASH("CacheFileOutputStream::OnChunkAvailable should not be called!");
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return NS_ERROR_UNEXPECTED;
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}
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nsresult CacheFileOutputStream::OnChunkUpdated(CacheFileChunk* aChunk) {
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MOZ_CRASH("CacheFileOutputStream::OnChunkUpdated should not be called!");
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return NS_ERROR_UNEXPECTED;
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}
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void CacheFileOutputStream::NotifyCloseListener() {
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RefPtr<CacheOutputCloseListener> listener;
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listener.swap(mCloseListener);
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if (!listener) return;
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listener->OnOutputClosed();
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}
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void CacheFileOutputStream::ReleaseChunk() {
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mFile->AssertOwnsLock();
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LOG(("CacheFileOutputStream::ReleaseChunk() [this=%p, idx=%d]", this,
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mChunk->Index()));
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// If the chunk didn't write any data we need to remove hash for this chunk
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// that was added when the chunk was created in CacheFile::GetChunkLocked.
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if (mChunk->DataSize() == 0) {
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// It must be due to a failure, we don't create a new chunk when we don't
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// have data to write.
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MOZ_ASSERT(NS_FAILED(mChunk->GetStatus()));
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mFile->mMetadata->RemoveHash(mChunk->Index());
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}
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mFile->ReleaseOutsideLock(std::move(mChunk));
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}
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void CacheFileOutputStream::EnsureCorrectChunk(bool aReleaseOnly) {
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mFile->AssertOwnsLock();
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LOG(("CacheFileOutputStream::EnsureCorrectChunk() [this=%p, releaseOnly=%d]",
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this, aReleaseOnly));
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uint32_t chunkIdx = mPos / kChunkSize;
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if (mChunk) {
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if (mChunk->Index() == chunkIdx) {
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// we have a correct chunk
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LOG(
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("CacheFileOutputStream::EnsureCorrectChunk() - Have correct chunk "
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"[this=%p, idx=%d]",
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this, chunkIdx));
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return;
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}
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ReleaseChunk();
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}
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if (aReleaseOnly) return;
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nsresult rv;
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rv = mFile->GetChunkLocked(chunkIdx, CacheFile::WRITER, nullptr,
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getter_AddRefs(mChunk));
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if (NS_FAILED(rv)) {
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LOG(
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("CacheFileOutputStream::EnsureCorrectChunk() - GetChunkLocked failed. "
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"[this=%p, idx=%d, rv=0x%08" PRIx32 "]",
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this, chunkIdx, static_cast<uint32_t>(rv)));
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CloseWithStatusLocked(rv);
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}
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}
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void CacheFileOutputStream::FillHole() {
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mFile->AssertOwnsLock();
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MOZ_ASSERT(mChunk);
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MOZ_ASSERT(mPos / kChunkSize == mChunk->Index());
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uint32_t pos = mPos - (mPos / kChunkSize) * kChunkSize;
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if (mChunk->DataSize() >= pos) return;
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LOG(
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("CacheFileOutputStream::FillHole() - Zeroing hole in chunk %d, range "
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"%d-%d [this=%p]",
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mChunk->Index(), mChunk->DataSize(), pos - 1, this));
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CacheFileChunkWriteHandle hnd = mChunk->GetWriteHandle(pos);
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if (!hnd.Buf()) {
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CloseWithStatusLocked(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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uint32_t offset = hnd.DataSize();
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memset(hnd.Buf() + offset, 0, pos - offset);
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hnd.UpdateDataSize(offset, pos - offset);
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}
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void CacheFileOutputStream::NotifyListener() {
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mFile->AssertOwnsLock();
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LOG(("CacheFileOutputStream::NotifyListener() [this=%p]", this));
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MOZ_ASSERT(mCallback);
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if (!mCallbackTarget) {
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mCallbackTarget = CacheFileIOManager::IOTarget();
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if (!mCallbackTarget) {
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LOG(
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("CacheFileOutputStream::NotifyListener() - Cannot get Cache I/O "
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"thread! Using main thread for callback."));
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mCallbackTarget = GetMainThreadEventTarget();
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}
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}
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nsCOMPtr<nsIOutputStreamCallback> asyncCallback =
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NS_NewOutputStreamReadyEvent(mCallback, mCallbackTarget);
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mCallback = nullptr;
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mCallbackTarget = nullptr;
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asyncCallback->OnOutputStreamReady(this);
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}
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// Memory reporting
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size_t CacheFileOutputStream::SizeOfIncludingThis(
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mozilla::MallocSizeOf mallocSizeOf) const {
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// Everything the stream keeps a reference to is already reported somewhere
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// else.
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// mFile reports itself.
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// mChunk reported as part of CacheFile.
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// mCloseListener is CacheEntry, already reported.
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// mCallback is usually CacheFile or a class that is reported elsewhere.
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return mallocSizeOf(this);
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}
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} // namespace mozilla::net
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