зеркало из https://github.com/mozilla/gecko-dev.git
1095 строки
29 KiB
C++
1095 строки
29 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 "CacheFileMetadata.h"
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#include "CacheFileIOManager.h"
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#include "nsICacheEntry.h"
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#include "CacheHashUtils.h"
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#include "CacheFileChunk.h"
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#include "CacheFileUtils.h"
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#include "nsILoadContextInfo.h"
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#include "nsICacheEntry.h" // for nsICacheEntryMetaDataVisitor
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#include "../cache/nsCacheUtils.h"
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#include "nsIFile.h"
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#include "mozilla/Telemetry.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/IntegerPrintfMacros.h"
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#include "prnetdb.h"
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namespace mozilla {
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namespace net {
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#define kMinMetadataRead 1024 // TODO find optimal value from telemetry
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#define kAlignSize 4096
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// Most of the cache entries fit into one chunk due to current chunk size. Make
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// sure to tweak this value if kChunkSize is going to change.
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#define kInitialHashArraySize 1
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// Initial elements buffer size.
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#define kInitialBufSize 64
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// Max size of elements in bytes.
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#define kMaxElementsSize 64*1024
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#define NOW_SECONDS() (uint32_t(PR_Now() / PR_USEC_PER_SEC))
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NS_IMPL_ISUPPORTS(CacheFileMetadata, CacheFileIOListener)
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CacheFileMetadata::CacheFileMetadata(CacheFileHandle *aHandle, const nsACString &aKey)
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: CacheMemoryConsumer(NORMAL)
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, mHandle(aHandle)
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, mHashArray(nullptr)
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, mHashArraySize(0)
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, mHashCount(0)
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, mOffset(-1)
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, mBuf(nullptr)
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, mBufSize(0)
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, mWriteBuf(nullptr)
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, mElementsSize(0)
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, mIsDirty(false)
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, mAnonymous(false)
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, mAllocExactSize(false)
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, mFirstRead(true)
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{
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LOG(("CacheFileMetadata::CacheFileMetadata() [this=%p, handle=%p, key=%s]",
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this, aHandle, PromiseFlatCString(aKey).get()));
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memset(&mMetaHdr, 0, sizeof(CacheFileMetadataHeader));
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mMetaHdr.mVersion = kCacheEntryVersion;
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mMetaHdr.mExpirationTime = nsICacheEntry::NO_EXPIRATION_TIME;
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mKey = aKey;
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DebugOnly<nsresult> rv;
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rv = ParseKey(aKey);
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MOZ_ASSERT(NS_SUCCEEDED(rv));
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}
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CacheFileMetadata::CacheFileMetadata(bool aMemoryOnly, bool aPinned, const nsACString &aKey)
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: CacheMemoryConsumer(aMemoryOnly ? MEMORY_ONLY : NORMAL)
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, mHandle(nullptr)
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, mHashArray(nullptr)
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, mHashArraySize(0)
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, mHashCount(0)
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, mOffset(0)
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, mBuf(nullptr)
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, mBufSize(0)
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, mWriteBuf(nullptr)
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, mElementsSize(0)
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, mIsDirty(true)
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, mAnonymous(false)
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, mAllocExactSize(false)
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, mFirstRead(true)
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{
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LOG(("CacheFileMetadata::CacheFileMetadata() [this=%p, key=%s]",
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this, PromiseFlatCString(aKey).get()));
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memset(&mMetaHdr, 0, sizeof(CacheFileMetadataHeader));
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mMetaHdr.mVersion = kCacheEntryVersion;
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if (aPinned) {
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AddFlags(kCacheEntryIsPinned);
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}
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mMetaHdr.mExpirationTime = nsICacheEntry::NO_EXPIRATION_TIME;
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mKey = aKey;
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mMetaHdr.mKeySize = mKey.Length();
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DebugOnly<nsresult> rv;
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rv = ParseKey(aKey);
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MOZ_ASSERT(NS_SUCCEEDED(rv));
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}
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CacheFileMetadata::CacheFileMetadata()
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: CacheMemoryConsumer(DONT_REPORT /* This is a helper class */)
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, mHandle(nullptr)
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, mHashArray(nullptr)
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, mHashArraySize(0)
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, mHashCount(0)
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, mOffset(0)
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, mBuf(nullptr)
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, mBufSize(0)
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, mWriteBuf(nullptr)
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, mElementsSize(0)
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, mIsDirty(false)
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, mAnonymous(false)
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, mAllocExactSize(false)
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, mFirstRead(true)
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{
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LOG(("CacheFileMetadata::CacheFileMetadata() [this=%p]", this));
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memset(&mMetaHdr, 0, sizeof(CacheFileMetadataHeader));
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}
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CacheFileMetadata::~CacheFileMetadata()
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{
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LOG(("CacheFileMetadata::~CacheFileMetadata() [this=%p]", this));
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MOZ_ASSERT(!mListener);
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if (mHashArray) {
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CacheFileUtils::FreeBuffer(mHashArray);
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mHashArray = nullptr;
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mHashArraySize = 0;
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}
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if (mBuf) {
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CacheFileUtils::FreeBuffer(mBuf);
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mBuf = nullptr;
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mBufSize = 0;
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}
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}
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void
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CacheFileMetadata::SetHandle(CacheFileHandle *aHandle)
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{
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LOG(("CacheFileMetadata::SetHandle() [this=%p, handle=%p]", this, aHandle));
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MOZ_ASSERT(!mHandle);
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mHandle = aHandle;
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}
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nsresult
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CacheFileMetadata::GetKey(nsACString &_retval)
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{
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_retval = mKey;
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return NS_OK;
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}
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nsresult
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CacheFileMetadata::ReadMetadata(CacheFileMetadataListener *aListener)
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{
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LOG(("CacheFileMetadata::ReadMetadata() [this=%p, listener=%p]", this, aListener));
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MOZ_ASSERT(!mListener);
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MOZ_ASSERT(!mHashArray);
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MOZ_ASSERT(!mBuf);
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MOZ_ASSERT(!mWriteBuf);
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nsresult rv;
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int64_t size = mHandle->FileSize();
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MOZ_ASSERT(size != -1);
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if (size == 0) {
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// this is a new entry
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LOG(("CacheFileMetadata::ReadMetadata() - Filesize == 0, creating empty "
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"metadata. [this=%p]", this));
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InitEmptyMetadata();
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aListener->OnMetadataRead(NS_OK);
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return NS_OK;
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}
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if (size < int64_t(sizeof(CacheFileMetadataHeader) + 2*sizeof(uint32_t))) {
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// there must be at least checksum, header and offset
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LOG(("CacheFileMetadata::ReadMetadata() - File is corrupted, creating "
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"empty metadata. [this=%p, filesize=%" PRId64 "]", this, size));
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InitEmptyMetadata();
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aListener->OnMetadataRead(NS_OK);
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return NS_OK;
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}
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// Set offset so that we read at least kMinMetadataRead if the file is big
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// enough.
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int64_t offset;
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if (size < kMinMetadataRead) {
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offset = 0;
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} else {
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offset = size - kMinMetadataRead;
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}
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// round offset to kAlignSize blocks
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offset = (offset / kAlignSize) * kAlignSize;
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mBufSize = size - offset;
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mBuf = static_cast<char *>(moz_xmalloc(mBufSize));
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DoMemoryReport(MemoryUsage());
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LOG(("CacheFileMetadata::ReadMetadata() - Reading metadata from disk, trying "
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"offset=%" PRId64 ", filesize=%" PRId64 " [this=%p]", offset, size, this));
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mReadStart = mozilla::TimeStamp::Now();
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mListener = aListener;
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rv = CacheFileIOManager::Read(mHandle, offset, mBuf, mBufSize, this);
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if (NS_FAILED(rv)) {
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LOG(("CacheFileMetadata::ReadMetadata() - CacheFileIOManager::Read() failed"
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" synchronously, creating empty metadata. [this=%p, rv=0x%08" PRIx32 "]",
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this, static_cast<uint32_t>(rv)));
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mListener = nullptr;
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InitEmptyMetadata();
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aListener->OnMetadataRead(NS_OK);
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return NS_OK;
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}
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return NS_OK;
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}
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uint32_t
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CacheFileMetadata::CalcMetadataSize(uint32_t aElementsSize, uint32_t aHashCount)
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{
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return sizeof(uint32_t) + // hash of the metadata
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aHashCount * sizeof(CacheHash::Hash16_t) + // array of chunk hashes
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sizeof(CacheFileMetadataHeader) + // metadata header
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mKey.Length() + 1 + // key with trailing null
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aElementsSize + // elements
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sizeof(uint32_t); // offset
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}
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nsresult
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CacheFileMetadata::WriteMetadata(uint32_t aOffset,
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CacheFileMetadataListener *aListener)
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{
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LOG(("CacheFileMetadata::WriteMetadata() [this=%p, offset=%d, listener=%p]",
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this, aOffset, aListener));
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MOZ_ASSERT(!mListener);
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MOZ_ASSERT(!mWriteBuf);
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nsresult rv;
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mIsDirty = false;
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mWriteBuf = static_cast<char *>(malloc(CalcMetadataSize(mElementsSize,
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mHashCount)));
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if (!mWriteBuf) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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char *p = mWriteBuf + sizeof(uint32_t);
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memcpy(p, mHashArray, mHashCount * sizeof(CacheHash::Hash16_t));
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p += mHashCount * sizeof(CacheHash::Hash16_t);
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mMetaHdr.WriteToBuf(p);
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p += sizeof(CacheFileMetadataHeader);
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memcpy(p, mKey.get(), mKey.Length());
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p += mKey.Length();
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*p = 0;
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p++;
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memcpy(p, mBuf, mElementsSize);
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p += mElementsSize;
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CacheHash::Hash32_t hash;
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hash = CacheHash::Hash(mWriteBuf + sizeof(uint32_t),
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p - mWriteBuf - sizeof(uint32_t));
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NetworkEndian::writeUint32(mWriteBuf, hash);
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NetworkEndian::writeUint32(p, aOffset);
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p += sizeof(uint32_t);
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char * writeBuffer = mWriteBuf;
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if (aListener) {
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mListener = aListener;
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} else {
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// We are not going to pass |this| as a callback so the buffer will be
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// released by CacheFileIOManager. Just null out mWriteBuf here.
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mWriteBuf = nullptr;
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}
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rv = CacheFileIOManager::Write(mHandle, aOffset, writeBuffer, p - writeBuffer,
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true, true, aListener ? this : nullptr);
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if (NS_FAILED(rv)) {
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LOG(("CacheFileMetadata::WriteMetadata() - CacheFileIOManager::Write() "
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"failed synchronously. [this=%p, rv=0x%08" PRIx32 "]",
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this, static_cast<uint32_t>(rv)));
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mListener = nullptr;
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if (mWriteBuf) {
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CacheFileUtils::FreeBuffer(mWriteBuf);
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mWriteBuf = nullptr;
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}
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NS_ENSURE_SUCCESS(rv, rv);
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}
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DoMemoryReport(MemoryUsage());
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return NS_OK;
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}
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nsresult
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CacheFileMetadata::SyncReadMetadata(nsIFile *aFile)
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{
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LOG(("CacheFileMetadata::SyncReadMetadata() [this=%p]", this));
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MOZ_ASSERT(!mListener);
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MOZ_ASSERT(!mHandle);
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MOZ_ASSERT(!mHashArray);
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MOZ_ASSERT(!mBuf);
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MOZ_ASSERT(!mWriteBuf);
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MOZ_ASSERT(mKey.IsEmpty());
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nsresult rv;
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int64_t fileSize;
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rv = aFile->GetFileSize(&fileSize);
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if (NS_FAILED(rv)) {
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// Don't bloat the console
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return rv;
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}
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PRFileDesc *fd;
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rv = aFile->OpenNSPRFileDesc(PR_RDONLY, 0600, &fd);
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NS_ENSURE_SUCCESS(rv, rv);
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int64_t offset = PR_Seek64(fd, fileSize - sizeof(uint32_t), PR_SEEK_SET);
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if (offset == -1) {
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PR_Close(fd);
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return NS_ERROR_FAILURE;
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}
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uint32_t metaOffset;
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int32_t bytesRead = PR_Read(fd, &metaOffset, sizeof(uint32_t));
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if (bytesRead != sizeof(uint32_t)) {
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PR_Close(fd);
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return NS_ERROR_FAILURE;
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}
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metaOffset = NetworkEndian::readUint32(&metaOffset);
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if (metaOffset > fileSize) {
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PR_Close(fd);
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return NS_ERROR_FAILURE;
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}
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mBuf = static_cast<char *>(malloc(fileSize - metaOffset));
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if (!mBuf) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mBufSize = fileSize - metaOffset;
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DoMemoryReport(MemoryUsage());
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offset = PR_Seek64(fd, metaOffset, PR_SEEK_SET);
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if (offset == -1) {
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PR_Close(fd);
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return NS_ERROR_FAILURE;
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}
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bytesRead = PR_Read(fd, mBuf, mBufSize);
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PR_Close(fd);
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if (bytesRead != static_cast<int32_t>(mBufSize)) {
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return NS_ERROR_FAILURE;
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}
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rv = ParseMetadata(metaOffset, 0, false);
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NS_ENSURE_SUCCESS(rv, rv);
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return NS_OK;
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}
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const char *
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CacheFileMetadata::GetElement(const char *aKey)
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{
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const char *data = mBuf;
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const char *limit = mBuf + mElementsSize;
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while (data < limit) {
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// Point to the value part
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const char *value = data + strlen(data) + 1;
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MOZ_ASSERT(value < limit, "Metadata elements corrupted");
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if (strcmp(data, aKey) == 0) {
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LOG(("CacheFileMetadata::GetElement() - Key found [this=%p, key=%s]",
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this, aKey));
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return value;
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}
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// Skip value part
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data = value + strlen(value) + 1;
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}
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MOZ_ASSERT(data == limit, "Metadata elements corrupted");
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LOG(("CacheFileMetadata::GetElement() - Key not found [this=%p, key=%s]",
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this, aKey));
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return nullptr;
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}
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nsresult
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CacheFileMetadata::SetElement(const char *aKey, const char *aValue)
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{
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LOG(("CacheFileMetadata::SetElement() [this=%p, key=%s, value=%p]",
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this, aKey, aValue));
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MarkDirty();
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nsresult rv;
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const uint32_t keySize = strlen(aKey) + 1;
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char *pos = const_cast<char *>(GetElement(aKey));
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if (!aValue) {
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// No value means remove the key/value pair completely, if existing
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if (pos) {
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uint32_t oldValueSize = strlen(pos) + 1;
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uint32_t offset = pos - mBuf;
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uint32_t remainder = mElementsSize - (offset + oldValueSize);
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memmove(pos - keySize, pos + oldValueSize, remainder);
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mElementsSize -= keySize + oldValueSize;
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}
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return NS_OK;
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}
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const uint32_t valueSize = strlen(aValue) + 1;
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uint32_t newSize = mElementsSize + valueSize;
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if (pos) {
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const uint32_t oldValueSize = strlen(pos) + 1;
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const uint32_t offset = pos - mBuf;
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const uint32_t remainder = mElementsSize - (offset + oldValueSize);
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// Update the value in place
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newSize -= oldValueSize;
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rv = EnsureBuffer(newSize);
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if (NS_FAILED(rv)) {
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return rv;
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}
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// Move the remainder to the right place
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pos = mBuf + offset;
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memmove(pos + valueSize, pos + oldValueSize, remainder);
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} else {
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// allocate new meta data element
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newSize += keySize;
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rv = EnsureBuffer(newSize);
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if (NS_FAILED(rv)) {
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return rv;
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}
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// Add after last element
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pos = mBuf + mElementsSize;
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memcpy(pos, aKey, keySize);
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pos += keySize;
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}
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// Update value
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memcpy(pos, aValue, valueSize);
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mElementsSize = newSize;
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return NS_OK;
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}
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nsresult
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CacheFileMetadata::Visit(nsICacheEntryMetaDataVisitor *aVisitor)
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{
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const char *data = mBuf;
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const char *limit = mBuf + mElementsSize;
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while (data < limit) {
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// Point to the value part
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const char *value = data + strlen(data) + 1;
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MOZ_ASSERT(value < limit, "Metadata elements corrupted");
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aVisitor->OnMetaDataElement(data, value);
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// Skip value part
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data = value + strlen(value) + 1;
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}
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MOZ_ASSERT(data == limit, "Metadata elements corrupted");
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return NS_OK;
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}
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CacheHash::Hash16_t
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CacheFileMetadata::GetHash(uint32_t aIndex)
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{
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MOZ_ASSERT(aIndex < mHashCount);
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return NetworkEndian::readUint16(&mHashArray[aIndex]);
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}
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nsresult
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CacheFileMetadata::SetHash(uint32_t aIndex, CacheHash::Hash16_t aHash)
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{
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LOG(("CacheFileMetadata::SetHash() [this=%p, idx=%d, hash=%x]",
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this, aIndex, aHash));
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MarkDirty();
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MOZ_ASSERT(aIndex <= mHashCount);
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if (aIndex > mHashCount) {
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return NS_ERROR_INVALID_ARG;
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} else if (aIndex == mHashCount) {
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if ((aIndex + 1) * sizeof(CacheHash::Hash16_t) > mHashArraySize) {
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// reallocate hash array buffer
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if (mHashArraySize == 0) {
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mHashArraySize = kInitialHashArraySize * sizeof(CacheHash::Hash16_t);
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} else {
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mHashArraySize *= 2;
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}
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mHashArray = static_cast<CacheHash::Hash16_t *>(
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moz_xrealloc(mHashArray, mHashArraySize));
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}
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mHashCount++;
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}
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NetworkEndian::writeUint16(&mHashArray[aIndex], aHash);
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DoMemoryReport(MemoryUsage());
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return NS_OK;
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}
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nsresult
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CacheFileMetadata::AddFlags(uint32_t aFlags)
|
|
{
|
|
MarkDirty(false);
|
|
mMetaHdr.mFlags |= aFlags;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::RemoveFlags(uint32_t aFlags)
|
|
{
|
|
MarkDirty(false);
|
|
mMetaHdr.mFlags &= ~aFlags;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::GetFlags(uint32_t *_retval)
|
|
{
|
|
*_retval = mMetaHdr.mFlags;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::SetExpirationTime(uint32_t aExpirationTime)
|
|
{
|
|
LOG(("CacheFileMetadata::SetExpirationTime() [this=%p, expirationTime=%d]",
|
|
this, aExpirationTime));
|
|
|
|
MarkDirty(false);
|
|
mMetaHdr.mExpirationTime = aExpirationTime;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::GetExpirationTime(uint32_t *_retval)
|
|
{
|
|
*_retval = mMetaHdr.mExpirationTime;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::SetFrecency(uint32_t aFrecency)
|
|
{
|
|
LOG(("CacheFileMetadata::SetFrecency() [this=%p, frecency=%f]",
|
|
this, (double)aFrecency));
|
|
|
|
MarkDirty(false);
|
|
mMetaHdr.mFrecency = aFrecency;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::GetFrecency(uint32_t *_retval)
|
|
{
|
|
*_retval = mMetaHdr.mFrecency;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::GetLastModified(uint32_t *_retval)
|
|
{
|
|
*_retval = mMetaHdr.mLastModified;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::GetLastFetched(uint32_t *_retval)
|
|
{
|
|
*_retval = mMetaHdr.mLastFetched;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::GetFetchCount(uint32_t *_retval)
|
|
{
|
|
*_retval = mMetaHdr.mFetchCount;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::OnFetched()
|
|
{
|
|
MarkDirty(false);
|
|
|
|
mMetaHdr.mLastFetched = NOW_SECONDS();
|
|
++mMetaHdr.mFetchCount;
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
CacheFileMetadata::MarkDirty(bool aUpdateLastModified)
|
|
{
|
|
mIsDirty = true;
|
|
if (aUpdateLastModified) {
|
|
mMetaHdr.mLastModified = NOW_SECONDS();
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::OnFileOpened(CacheFileHandle *aHandle, nsresult aResult)
|
|
{
|
|
MOZ_CRASH("CacheFileMetadata::OnFileOpened should not be called!");
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::OnDataWritten(CacheFileHandle *aHandle, const char *aBuf,
|
|
nsresult aResult)
|
|
{
|
|
LOG(("CacheFileMetadata::OnDataWritten() [this=%p, handle=%p, result=0x%08" PRIx32 "]",
|
|
this, aHandle, static_cast<uint32_t>(aResult)));
|
|
|
|
MOZ_ASSERT(mListener);
|
|
MOZ_ASSERT(mWriteBuf);
|
|
|
|
CacheFileUtils::FreeBuffer(mWriteBuf);
|
|
mWriteBuf = nullptr;
|
|
|
|
nsCOMPtr<CacheFileMetadataListener> listener;
|
|
|
|
mListener.swap(listener);
|
|
listener->OnMetadataWritten(aResult);
|
|
|
|
DoMemoryReport(MemoryUsage());
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::OnDataRead(CacheFileHandle *aHandle, char *aBuf,
|
|
nsresult aResult)
|
|
{
|
|
LOG(("CacheFileMetadata::OnDataRead() [this=%p, handle=%p, result=0x%08" PRIx32 "]",
|
|
this, aHandle, static_cast<uint32_t>(aResult)));
|
|
|
|
MOZ_ASSERT(mListener);
|
|
|
|
nsresult rv;
|
|
nsCOMPtr<CacheFileMetadataListener> listener;
|
|
|
|
if (NS_FAILED(aResult)) {
|
|
LOG(("CacheFileMetadata::OnDataRead() - CacheFileIOManager::Read() failed"
|
|
", creating empty metadata. [this=%p, rv=0x%08" PRIx32 "]",
|
|
this, static_cast<uint32_t>(aResult)));
|
|
|
|
InitEmptyMetadata();
|
|
|
|
mListener.swap(listener);
|
|
listener->OnMetadataRead(NS_OK);
|
|
return NS_OK;
|
|
}
|
|
|
|
if (mFirstRead) {
|
|
Telemetry::AccumulateTimeDelta(
|
|
Telemetry::NETWORK_CACHE_METADATA_FIRST_READ_TIME_MS, mReadStart);
|
|
Telemetry::Accumulate(
|
|
Telemetry::NETWORK_CACHE_METADATA_FIRST_READ_SIZE, mBufSize);
|
|
} else {
|
|
Telemetry::AccumulateTimeDelta(
|
|
Telemetry::NETWORK_CACHE_METADATA_SECOND_READ_TIME_MS, mReadStart);
|
|
}
|
|
|
|
// check whether we have read all necessary data
|
|
uint32_t realOffset = NetworkEndian::readUint32(mBuf + mBufSize -
|
|
sizeof(uint32_t));
|
|
|
|
int64_t size = mHandle->FileSize();
|
|
MOZ_ASSERT(size != -1);
|
|
|
|
if (realOffset >= size) {
|
|
LOG(("CacheFileMetadata::OnDataRead() - Invalid realOffset, creating "
|
|
"empty metadata. [this=%p, realOffset=%u, size=%" PRId64 "]", this,
|
|
realOffset, size));
|
|
|
|
InitEmptyMetadata();
|
|
|
|
mListener.swap(listener);
|
|
listener->OnMetadataRead(NS_OK);
|
|
return NS_OK;
|
|
}
|
|
|
|
uint32_t maxHashCount = size / kChunkSize;
|
|
uint32_t maxMetadataSize = CalcMetadataSize(kMaxElementsSize, maxHashCount);
|
|
if (size - realOffset > maxMetadataSize) {
|
|
LOG(("CacheFileMetadata::OnDataRead() - Invalid realOffset, metadata would "
|
|
"be too big, creating empty metadata. [this=%p, realOffset=%u, "
|
|
"maxMetadataSize=%u, size=%" PRId64 "]", this, realOffset, maxMetadataSize,
|
|
size));
|
|
|
|
InitEmptyMetadata();
|
|
|
|
mListener.swap(listener);
|
|
listener->OnMetadataRead(NS_OK);
|
|
return NS_OK;
|
|
}
|
|
|
|
uint32_t usedOffset = size - mBufSize;
|
|
|
|
if (realOffset < usedOffset) {
|
|
uint32_t missing = usedOffset - realOffset;
|
|
// we need to read more data
|
|
char *newBuf = static_cast<char *>(realloc(mBuf, mBufSize + missing));
|
|
if (!newBuf) {
|
|
LOG(("CacheFileMetadata::OnDataRead() - Error allocating %d more bytes "
|
|
"for the missing part of the metadata, creating empty metadata. "
|
|
"[this=%p]", missing, this));
|
|
|
|
InitEmptyMetadata();
|
|
|
|
mListener.swap(listener);
|
|
listener->OnMetadataRead(NS_OK);
|
|
return NS_OK;
|
|
}
|
|
|
|
mBuf = newBuf;
|
|
memmove(mBuf + missing, mBuf, mBufSize);
|
|
mBufSize += missing;
|
|
|
|
DoMemoryReport(MemoryUsage());
|
|
|
|
LOG(("CacheFileMetadata::OnDataRead() - We need to read %d more bytes to "
|
|
"have full metadata. [this=%p]", missing, this));
|
|
|
|
mFirstRead = false;
|
|
mReadStart = mozilla::TimeStamp::Now();
|
|
rv = CacheFileIOManager::Read(mHandle, realOffset, mBuf, missing, this);
|
|
if (NS_FAILED(rv)) {
|
|
LOG(("CacheFileMetadata::OnDataRead() - CacheFileIOManager::Read() "
|
|
"failed synchronously, creating empty metadata. [this=%p, "
|
|
"rv=0x%08" PRIx32 "]", this, static_cast<uint32_t>(rv)));
|
|
|
|
InitEmptyMetadata();
|
|
|
|
mListener.swap(listener);
|
|
listener->OnMetadataRead(NS_OK);
|
|
return NS_OK;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
Telemetry::Accumulate(Telemetry::NETWORK_CACHE_METADATA_SIZE,
|
|
size - realOffset);
|
|
|
|
// We have all data according to offset information at the end of the entry.
|
|
// Try to parse it.
|
|
rv = ParseMetadata(realOffset, realOffset - usedOffset, true);
|
|
if (NS_FAILED(rv)) {
|
|
LOG(("CacheFileMetadata::OnDataRead() - Error parsing metadata, creating "
|
|
"empty metadata. [this=%p]", this));
|
|
InitEmptyMetadata();
|
|
} else {
|
|
// Shrink elements buffer.
|
|
mBuf = static_cast<char *>(moz_xrealloc(mBuf, mElementsSize));
|
|
mBufSize = mElementsSize;
|
|
|
|
// There is usually no or just one call to SetMetadataElement() when the
|
|
// metadata is parsed from disk. Avoid allocating power of two sized buffer
|
|
// which we do in case of newly created metadata.
|
|
mAllocExactSize = true;
|
|
}
|
|
|
|
mListener.swap(listener);
|
|
listener->OnMetadataRead(NS_OK);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::OnFileDoomed(CacheFileHandle *aHandle, nsresult aResult)
|
|
{
|
|
MOZ_CRASH("CacheFileMetadata::OnFileDoomed should not be called!");
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::OnEOFSet(CacheFileHandle *aHandle, nsresult aResult)
|
|
{
|
|
MOZ_CRASH("CacheFileMetadata::OnEOFSet should not be called!");
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::OnFileRenamed(CacheFileHandle *aHandle, nsresult aResult)
|
|
{
|
|
MOZ_CRASH("CacheFileMetadata::OnFileRenamed should not be called!");
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
|
|
void
|
|
CacheFileMetadata::InitEmptyMetadata()
|
|
{
|
|
if (mBuf) {
|
|
CacheFileUtils::FreeBuffer(mBuf);
|
|
mBuf = nullptr;
|
|
mBufSize = 0;
|
|
}
|
|
mAllocExactSize = false;
|
|
mOffset = 0;
|
|
mMetaHdr.mVersion = kCacheEntryVersion;
|
|
mMetaHdr.mFetchCount = 0;
|
|
mMetaHdr.mExpirationTime = nsICacheEntry::NO_EXPIRATION_TIME;
|
|
mMetaHdr.mKeySize = mKey.Length();
|
|
|
|
// Deliberately not touching the "kCacheEntryIsPinned" flag.
|
|
|
|
DoMemoryReport(MemoryUsage());
|
|
|
|
// We're creating a new entry. If there is any old data truncate it.
|
|
if (mHandle) {
|
|
mHandle->SetPinned(Pinned());
|
|
// We can pronounce the handle as invalid now, because it simply
|
|
// doesn't have the correct metadata. This will cause IO operations
|
|
// be bypassed during shutdown (mainly dooming it, when a channel
|
|
// is canceled by closing the window.)
|
|
mHandle->SetInvalid();
|
|
if (mHandle->FileExists() && mHandle->FileSize()) {
|
|
CacheFileIOManager::TruncateSeekSetEOF(mHandle, 0, 0, nullptr);
|
|
}
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::ParseMetadata(uint32_t aMetaOffset, uint32_t aBufOffset,
|
|
bool aHaveKey)
|
|
{
|
|
LOG(("CacheFileMetadata::ParseMetadata() [this=%p, metaOffset=%d, "
|
|
"bufOffset=%d, haveKey=%u]", this, aMetaOffset, aBufOffset, aHaveKey));
|
|
|
|
nsresult rv;
|
|
|
|
uint32_t metaposOffset = mBufSize - sizeof(uint32_t);
|
|
uint32_t hashesOffset = aBufOffset + sizeof(uint32_t);
|
|
uint32_t hashCount = aMetaOffset / kChunkSize;
|
|
if (aMetaOffset % kChunkSize)
|
|
hashCount++;
|
|
uint32_t hashesLen = hashCount * sizeof(CacheHash::Hash16_t);
|
|
uint32_t hdrOffset = hashesOffset + hashesLen;
|
|
uint32_t keyOffset = hdrOffset + sizeof(CacheFileMetadataHeader);
|
|
|
|
LOG(("CacheFileMetadata::ParseMetadata() [this=%p]\n metaposOffset=%d\n "
|
|
"hashesOffset=%d\n hashCount=%d\n hashesLen=%d\n hdfOffset=%d\n "
|
|
"keyOffset=%d\n", this, metaposOffset, hashesOffset, hashCount,
|
|
hashesLen,hdrOffset, keyOffset));
|
|
|
|
if (keyOffset > metaposOffset) {
|
|
LOG(("CacheFileMetadata::ParseMetadata() - Wrong keyOffset! [this=%p]",
|
|
this));
|
|
return NS_ERROR_FILE_CORRUPTED;
|
|
}
|
|
|
|
mMetaHdr.ReadFromBuf(mBuf + hdrOffset);
|
|
|
|
if (mMetaHdr.mVersion == 1) {
|
|
// Backward compatibility before we've added flags to the header
|
|
keyOffset -= sizeof(uint32_t);
|
|
} else if (mMetaHdr.mVersion == 2) {
|
|
// Version 2 just lacks the ability to store alternative data. Nothing to do
|
|
// here.
|
|
} else if (mMetaHdr.mVersion != kCacheEntryVersion) {
|
|
LOG(("CacheFileMetadata::ParseMetadata() - Not a version we understand to. "
|
|
"[version=0x%x, this=%p]", mMetaHdr.mVersion, this));
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
|
|
// Update the version stored in the header to make writes
|
|
// store the header in the current version form.
|
|
mMetaHdr.mVersion = kCacheEntryVersion;
|
|
|
|
uint32_t elementsOffset = mMetaHdr.mKeySize + keyOffset + 1;
|
|
|
|
if (elementsOffset > metaposOffset) {
|
|
LOG(("CacheFileMetadata::ParseMetadata() - Wrong elementsOffset %d "
|
|
"[this=%p]", elementsOffset, this));
|
|
return NS_ERROR_FILE_CORRUPTED;
|
|
}
|
|
|
|
// check that key ends with \0
|
|
if (mBuf[elementsOffset - 1] != 0) {
|
|
LOG(("CacheFileMetadata::ParseMetadata() - Elements not null terminated. "
|
|
"[this=%p]", this));
|
|
return NS_ERROR_FILE_CORRUPTED;
|
|
}
|
|
|
|
|
|
if (!aHaveKey) {
|
|
// get the key form metadata
|
|
mKey.Assign(mBuf + keyOffset, mMetaHdr.mKeySize);
|
|
|
|
rv = ParseKey(mKey);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
}
|
|
else {
|
|
if (mMetaHdr.mKeySize != mKey.Length()) {
|
|
LOG(("CacheFileMetadata::ParseMetadata() - Key collision (1), key=%s "
|
|
"[this=%p]", nsCString(mBuf + keyOffset, mMetaHdr.mKeySize).get(),
|
|
this));
|
|
return NS_ERROR_FILE_CORRUPTED;
|
|
}
|
|
|
|
if (memcmp(mKey.get(), mBuf + keyOffset, mKey.Length()) != 0) {
|
|
LOG(("CacheFileMetadata::ParseMetadata() - Key collision (2), key=%s "
|
|
"[this=%p]", nsCString(mBuf + keyOffset, mMetaHdr.mKeySize).get(),
|
|
this));
|
|
return NS_ERROR_FILE_CORRUPTED;
|
|
}
|
|
}
|
|
|
|
// check metadata hash (data from hashesOffset to metaposOffset)
|
|
CacheHash::Hash32_t hashComputed, hashExpected;
|
|
hashComputed = CacheHash::Hash(mBuf + hashesOffset,
|
|
metaposOffset - hashesOffset);
|
|
hashExpected = NetworkEndian::readUint32(mBuf + aBufOffset);
|
|
|
|
if (hashComputed != hashExpected) {
|
|
LOG(("CacheFileMetadata::ParseMetadata() - Metadata hash mismatch! Hash of "
|
|
"the metadata is %x, hash in file is %x [this=%p]", hashComputed,
|
|
hashExpected, this));
|
|
return NS_ERROR_FILE_CORRUPTED;
|
|
}
|
|
|
|
// check elements
|
|
rv = CheckElements(mBuf + elementsOffset, metaposOffset - elementsOffset);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
if (mHandle) {
|
|
if (!mHandle->SetPinned(Pinned())) {
|
|
LOG(("CacheFileMetadata::ParseMetadata() - handle was doomed for this "
|
|
"pinning state, truncate the file [this=%p, pinned=%d]", this, Pinned()));
|
|
return NS_ERROR_FILE_CORRUPTED;
|
|
}
|
|
}
|
|
|
|
mHashArraySize = hashesLen;
|
|
mHashCount = hashCount;
|
|
if (mHashArraySize) {
|
|
mHashArray = static_cast<CacheHash::Hash16_t *>(
|
|
moz_xmalloc(mHashArraySize));
|
|
memcpy(mHashArray, mBuf + hashesOffset, mHashArraySize);
|
|
}
|
|
|
|
MarkDirty();
|
|
|
|
mElementsSize = metaposOffset - elementsOffset;
|
|
memmove(mBuf, mBuf + elementsOffset, mElementsSize);
|
|
mOffset = aMetaOffset;
|
|
|
|
DoMemoryReport(MemoryUsage());
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::CheckElements(const char *aBuf, uint32_t aSize)
|
|
{
|
|
if (aSize) {
|
|
// Check if the metadata ends with a zero byte.
|
|
if (aBuf[aSize - 1] != 0) {
|
|
NS_ERROR("Metadata elements are not null terminated");
|
|
LOG(("CacheFileMetadata::CheckElements() - Elements are not null "
|
|
"terminated. [this=%p]", this));
|
|
return NS_ERROR_FILE_CORRUPTED;
|
|
}
|
|
// Check that there are an even number of zero bytes
|
|
// to match the pattern { key \0 value \0 }
|
|
bool odd = false;
|
|
for (uint32_t i = 0; i < aSize; i++) {
|
|
if (aBuf[i] == 0)
|
|
odd = !odd;
|
|
}
|
|
if (odd) {
|
|
NS_ERROR("Metadata elements are malformed");
|
|
LOG(("CacheFileMetadata::CheckElements() - Elements are malformed. "
|
|
"[this=%p]", this));
|
|
return NS_ERROR_FILE_CORRUPTED;
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::EnsureBuffer(uint32_t aSize)
|
|
{
|
|
if (aSize > kMaxElementsSize) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
if (mBufSize < aSize) {
|
|
if (mAllocExactSize) {
|
|
// If this is not the only allocation, use power of two for following
|
|
// allocations.
|
|
mAllocExactSize = false;
|
|
} else {
|
|
// find smallest power of 2 greater than or equal to aSize
|
|
--aSize;
|
|
aSize |= aSize >> 1;
|
|
aSize |= aSize >> 2;
|
|
aSize |= aSize >> 4;
|
|
aSize |= aSize >> 8;
|
|
aSize |= aSize >> 16;
|
|
++aSize;
|
|
}
|
|
|
|
if (aSize < kInitialBufSize) {
|
|
aSize = kInitialBufSize;
|
|
}
|
|
|
|
char *newBuf = static_cast<char *>(realloc(mBuf, aSize));
|
|
if (!newBuf) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
mBufSize = aSize;
|
|
mBuf = newBuf;
|
|
|
|
DoMemoryReport(MemoryUsage());
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
CacheFileMetadata::ParseKey(const nsACString &aKey)
|
|
{
|
|
nsCOMPtr<nsILoadContextInfo> info = CacheFileUtils::ParseKey(aKey);
|
|
NS_ENSURE_TRUE(info, NS_ERROR_FAILURE);
|
|
|
|
mAnonymous = info->IsAnonymous();
|
|
mOriginAttributes = *info->OriginAttributesPtr();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// Memory reporting
|
|
|
|
size_t
|
|
CacheFileMetadata::SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const
|
|
{
|
|
size_t n = 0;
|
|
// mHandle reported via CacheFileIOManager.
|
|
n += mKey.SizeOfExcludingThisIfUnshared(mallocSizeOf);
|
|
n += mallocSizeOf(mHashArray);
|
|
n += mallocSizeOf(mBuf);
|
|
n += mallocSizeOf(mWriteBuf);
|
|
// mListener is usually the owning CacheFile.
|
|
|
|
return n;
|
|
}
|
|
|
|
size_t
|
|
CacheFileMetadata::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
|
|
{
|
|
return mallocSizeOf(this) + SizeOfExcludingThis(mallocSizeOf);
|
|
}
|
|
|
|
} // namespace net
|
|
} // namespace mozilla
|