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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 "mozilla/NotNull.h"
#include "nsString.h"
class nsICacheEntryMetaDataVisitor;
namespace mozilla {
namespace net {
namespace CacheFileUtils {
class CacheFileLock;
};
// 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 final : public CacheFileIOListener,
public CacheMemoryConsumer {
public:
NS_DECL_THREADSAFE_ISUPPORTS
CacheFileMetadata(CacheFileHandle* aHandle, const nsACString& aKey,
NotNull<CacheFileUtils::CacheFileLock*> aLock);
CacheFileMetadata(bool aMemoryOnly, bool aPinned, const nsACString& aKey,
NotNull<CacheFileUtils::CacheFileLock*> aLock);
CacheFileMetadata();
void SetHandle(CacheFileHandle* aHandle);
const nsACString& GetKey() const { return mKey; }
void 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::OriginAttributes 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);
void Visit(nsICacheEntryMetaDataVisitor* aVisitor);
CacheHash::Hash16_t GetHash(uint32_t aIndex);
nsresult SetHash(uint32_t aIndex, CacheHash::Hash16_t aHash);
nsresult RemoveHash(uint32_t aIndex);
void AddFlags(uint32_t aFlags);
void RemoveFlags(uint32_t aFlags);
uint32_t GetFlags() const { return mMetaHdr.mFlags; }
void SetExpirationTime(uint32_t aExpirationTime);
uint32_t GetExpirationTime() const { return mMetaHdr.mExpirationTime; }
void SetFrecency(uint32_t aFrecency);
uint32_t GetFrecency() const { return mMetaHdr.mFrecency; }
uint32_t GetLastModified() const { return mMetaHdr.mLastModified; }
uint32_t GetLastFetched() const { return mMetaHdr.mLastFetched; }
uint32_t GetFetchCount() const { return mMetaHdr.mFetchCount; }
// Called by upper layers to indicate the entry this metadata belongs
// with has been fetched, i.e. delivered to the consumer.
void 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{nullptr};
uint32_t mHashArraySize{0};
uint32_t mHashCount{0};
int64_t mOffset{0};
// used for parsing, then points to elements
char* mBuf{nullptr};
uint32_t mBufSize{0};
char* mWriteBuf{nullptr};
CacheFileMetadataHeader mMetaHdr{0};
uint32_t mElementsSize{0};
bool mIsDirty : 1;
bool mAnonymous : 1;
bool mAllocExactSize : 1;
bool mFirstRead : 1;
mozilla::OriginAttributes mOriginAttributes;
mozilla::TimeStamp mReadStart;
nsCOMPtr<CacheFileMetadataListener> mListener;
RefPtr<CacheFileUtils::CacheFileLock> mLock;
};
} // namespace net
} // namespace mozilla
#endif
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