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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
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netwerk/cache2/CacheFileMetadata.h Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef CacheFileMetadata__h__
#define CacheFileMetadata__h__
#include "CacheFileIOManager.h"
#include "CacheStorageService.h"
#include "CacheHashUtils.h"
#include "CacheObserver.h"
#include "mozilla/EndianUtils.h"
#include "mozilla/BasePrincipal.h"
#include "nsAutoPtr.h"
#include "nsString.h"
class nsICacheEntryMetaDataVisitor;
namespace mozilla {
namespace net {
// Flags stored in CacheFileMetadataHeader.mFlags
// Whether an entry is a pinned entry (created with
// nsICacheStorageService.pinningCacheStorage.)
static const uint32_t kCacheEntryIsPinned = 1 << 0;
// By multiplying with the current half-life we convert the frecency
// to time independent of half-life value. The range fits 32bits.
// When decay time changes on next run of the browser, we convert
// the frecency value to a correct internal representation again.
// It might not be 100% accurate, but for the purpose it suffice.
#define FRECENCY2INT(aFrecency) \
((uint32_t)((aFrecency) * CacheObserver::HalfLifeSeconds()))
#define INT2FRECENCY(aInt) \
((double)(aInt) / (double)CacheObserver::HalfLifeSeconds())
#define kCacheEntryVersion 3
#pragma pack(push)
#pragma pack(1)
class CacheFileMetadataHeader {
public:
uint32_t mVersion;
uint32_t mFetchCount;
uint32_t mLastFetched;
uint32_t mLastModified;
uint32_t mFrecency;
uint32_t mExpirationTime;
uint32_t mKeySize;
uint32_t mFlags;
void WriteToBuf(void *aBuf)
{
EnsureCorrectClassSize();
uint8_t* ptr = static_cast<uint8_t*>(aBuf);
MOZ_ASSERT(mVersion == kCacheEntryVersion);
NetworkEndian::writeUint32(ptr, mVersion); ptr += sizeof(uint32_t);
NetworkEndian::writeUint32(ptr, mFetchCount); ptr += sizeof(uint32_t);
NetworkEndian::writeUint32(ptr, mLastFetched); ptr += sizeof(uint32_t);
NetworkEndian::writeUint32(ptr, mLastModified); ptr += sizeof(uint32_t);
NetworkEndian::writeUint32(ptr, mFrecency); ptr += sizeof(uint32_t);
NetworkEndian::writeUint32(ptr, mExpirationTime); ptr += sizeof(uint32_t);
NetworkEndian::writeUint32(ptr, mKeySize); ptr += sizeof(uint32_t);
NetworkEndian::writeUint32(ptr, mFlags);
}
void ReadFromBuf(const void *aBuf)
{
EnsureCorrectClassSize();
const uint8_t* ptr = static_cast<const uint8_t*>(aBuf);
mVersion = BigEndian::readUint32(ptr); ptr += sizeof(uint32_t);
mFetchCount = BigEndian::readUint32(ptr); ptr += sizeof(uint32_t);
mLastFetched = BigEndian::readUint32(ptr); ptr += sizeof(uint32_t);
mLastModified = BigEndian::readUint32(ptr); ptr += sizeof(uint32_t);
mFrecency = BigEndian::readUint32(ptr); ptr += sizeof(uint32_t);
mExpirationTime = BigEndian::readUint32(ptr); ptr += sizeof(uint32_t);
mKeySize = BigEndian::readUint32(ptr); ptr += sizeof(uint32_t);
if (mVersion >= 2) {
mFlags = BigEndian::readUint32(ptr);
} else {
mFlags = 0;
}
}
inline void EnsureCorrectClassSize()
{
static_assert((sizeof(mVersion) + sizeof(mFetchCount) +
sizeof(mLastFetched) + sizeof(mLastModified) + sizeof(mFrecency) +
sizeof(mExpirationTime) + sizeof(mKeySize)) + sizeof(mFlags) ==
sizeof(CacheFileMetadataHeader),
"Unexpected sizeof(CacheFileMetadataHeader)!");
}
};
#pragma pack(pop)
#define CACHEFILEMETADATALISTENER_IID \
{ /* a9e36125-3f01-4020-9540-9dafa8d31ba7 */ \
0xa9e36125, \
0x3f01, \
0x4020, \
{0x95, 0x40, 0x9d, 0xaf, 0xa8, 0xd3, 0x1b, 0xa7} \
}
class CacheFileMetadataListener : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(CACHEFILEMETADATALISTENER_IID)
NS_IMETHOD OnMetadataRead(nsresult aResult) = 0;
NS_IMETHOD OnMetadataWritten(nsresult aResult) = 0;
virtual bool IsKilled() = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(CacheFileMetadataListener,
CACHEFILEMETADATALISTENER_IID)
class CacheFileMetadata : public CacheFileIOListener
, public CacheMemoryConsumer
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
CacheFileMetadata(CacheFileHandle *aHandle,
const nsACString &aKey);
CacheFileMetadata(bool aMemoryOnly,
bool aPinned,
const nsACString &aKey);
CacheFileMetadata();
void SetHandle(CacheFileHandle *aHandle);
nsresult GetKey(nsACString &_retval);
nsresult ReadMetadata(CacheFileMetadataListener *aListener);
uint32_t CalcMetadataSize(uint32_t aElementsSize, uint32_t aHashCount);
nsresult WriteMetadata(uint32_t aOffset,
CacheFileMetadataListener *aListener);
nsresult SyncReadMetadata(nsIFile *aFile);
bool IsAnonymous() const { return mAnonymous; }
mozilla::NeckoOriginAttributes const & OriginAttributes() const { return mOriginAttributes; }
bool Pinned() const { return !!(mMetaHdr.mFlags & kCacheEntryIsPinned); }
const char * GetElement(const char *aKey);
nsresult SetElement(const char *aKey, const char *aValue);
nsresult Visit(nsICacheEntryMetaDataVisitor *aVisitor);
CacheHash::Hash16_t GetHash(uint32_t aIndex);
nsresult SetHash(uint32_t aIndex, CacheHash::Hash16_t aHash);
nsresult AddFlags(uint32_t aFlags);
nsresult RemoveFlags(uint32_t aFlags);
nsresult GetFlags(uint32_t *_retval);
nsresult SetExpirationTime(uint32_t aExpirationTime);
nsresult GetExpirationTime(uint32_t *_retval);
nsresult SetFrecency(uint32_t aFrecency);
nsresult GetFrecency(uint32_t *_retval);
nsresult GetLastModified(uint32_t *_retval);
nsresult GetLastFetched(uint32_t *_retval);
nsresult GetFetchCount(uint32_t *_retval);
// Called by upper layers to indicate the entry this metadata belongs
// with has been fetched, i.e. delivered to the consumer.
nsresult OnFetched();
int64_t Offset() { return mOffset; }
uint32_t ElementsSize() { return mElementsSize; }
void MarkDirty(bool aUpdateLastModified = true);
bool IsDirty() { return mIsDirty; }
uint32_t MemoryUsage() { return sizeof(CacheFileMetadata) + mHashArraySize + mBufSize; }
NS_IMETHOD OnFileOpened(CacheFileHandle *aHandle, nsresult aResult) override;
NS_IMETHOD OnDataWritten(CacheFileHandle *aHandle, const char *aBuf,
nsresult aResult) override;
NS_IMETHOD OnDataRead(CacheFileHandle *aHandle, char *aBuf, nsresult aResult) override;
NS_IMETHOD OnFileDoomed(CacheFileHandle *aHandle, nsresult aResult) override;
NS_IMETHOD OnEOFSet(CacheFileHandle *aHandle, nsresult aResult) override;
NS_IMETHOD OnFileRenamed(CacheFileHandle *aHandle, nsresult aResult) override;
virtual bool IsKilled() override { return mListener && mListener->IsKilled(); }
void InitEmptyMetadata();
// Memory reporting
size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
private:
virtual ~CacheFileMetadata();
nsresult ParseMetadata(uint32_t aMetaOffset, uint32_t aBufOffset, bool aHaveKey);
nsresult CheckElements(const char *aBuf, uint32_t aSize);
nsresult EnsureBuffer(uint32_t aSize);
nsresult ParseKey(const nsACString &aKey);
RefPtr<CacheFileHandle> mHandle;
nsCString mKey;
CacheHash::Hash16_t *mHashArray;
uint32_t mHashArraySize;
uint32_t mHashCount;
int64_t mOffset;
char *mBuf; // used for parsing, then points
// to elements
uint32_t mBufSize;
char *mWriteBuf;
CacheFileMetadataHeader mMetaHdr;
uint32_t mElementsSize;
bool mIsDirty : 1;
bool mAnonymous : 1;
bool mAllocExactSize : 1;
bool mFirstRead : 1;
mozilla::NeckoOriginAttributes mOriginAttributes;
mozilla::TimeStamp mReadStart;
nsCOMPtr<CacheFileMetadataListener> mListener;
};
} // namespace net
} // namespace mozilla
#endif