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