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Diffstat (limited to 'netwerk/cache2/CacheFileMetadata.h')
| -rw-r--r-- | netwerk/cache2/CacheFileMetadata.h | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/netwerk/cache2/CacheFileMetadata.h b/netwerk/cache2/CacheFileMetadata.h new file mode 100644 index 0000000000..329a9629e7 --- /dev/null +++ b/netwerk/cache2/CacheFileMetadata.h @@ -0,0 +1,245 @@ +/* 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 |