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-rw-r--r--netwerk/cache2/CacheFile.h288
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diff --git a/netwerk/cache2/CacheFile.h b/netwerk/cache2/CacheFile.h
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+++ b/netwerk/cache2/CacheFile.h
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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 CacheFile__h__
+#define CacheFile__h__
+
+#include "CacheFileChunk.h"
+#include "CacheFileIOManager.h"
+#include "CacheFileMetadata.h"
+#include "nsRefPtrHashtable.h"
+#include "nsClassHashtable.h"
+#include "mozilla/Mutex.h"
+
+class nsIAsyncOutputStream;
+class nsICacheEntry;
+class nsICacheEntryMetaDataVisitor;
+class nsIInputStream;
+class nsIOutputStream;
+
+namespace mozilla {
+namespace net {
+
+class CacheFileInputStream;
+class CacheFileOutputStream;
+class CacheOutputCloseListener;
+class MetadataWriteTimer;
+
+namespace CacheFileUtils {
+class CacheFileLock;
+};
+
+#define CACHEFILELISTENER_IID \
+ { /* 95e7f284-84ba-48f9-b1fc-3a7336b4c33c */ \
+ 0x95e7f284, 0x84ba, 0x48f9, { \
+ 0xb1, 0xfc, 0x3a, 0x73, 0x36, 0xb4, 0xc3, 0x3c \
+ } \
+ }
+
+class CacheFileListener : public nsISupports {
+ public:
+ NS_DECLARE_STATIC_IID_ACCESSOR(CACHEFILELISTENER_IID)
+
+ NS_IMETHOD OnFileReady(nsresult aResult, bool aIsNew) = 0;
+ NS_IMETHOD OnFileDoomed(nsresult aResult) = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(CacheFileListener, CACHEFILELISTENER_IID)
+
+class MOZ_CAPABILITY("mutex") CacheFile final
+ : public CacheFileChunkListener,
+ public CacheFileIOListener,
+ public CacheFileMetadataListener {
+ public:
+ NS_DECL_THREADSAFE_ISUPPORTS
+
+ CacheFile();
+
+ nsresult Init(const nsACString& aKey, bool aCreateNew, bool aMemoryOnly,
+ bool aSkipSizeCheck, bool aPriority, bool aPinned,
+ CacheFileListener* aCallback);
+
+ NS_IMETHOD OnChunkRead(nsresult aResult, CacheFileChunk* aChunk) override;
+ NS_IMETHOD OnChunkWritten(nsresult aResult, CacheFileChunk* aChunk) override;
+ NS_IMETHOD OnChunkAvailable(nsresult aResult, uint32_t aChunkIdx,
+ CacheFileChunk* aChunk) override;
+ NS_IMETHOD OnChunkUpdated(CacheFileChunk* aChunk) override;
+
+ 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;
+
+ NS_IMETHOD OnMetadataRead(nsresult aResult) override;
+ NS_IMETHOD OnMetadataWritten(nsresult aResult) override;
+
+ NS_IMETHOD OpenInputStream(nsICacheEntry* aCacheEntryHandle,
+ nsIInputStream** _retval);
+ NS_IMETHOD OpenAlternativeInputStream(nsICacheEntry* aCacheEntryHandle,
+ const char* aAltDataType,
+ nsIInputStream** _retval);
+ NS_IMETHOD OpenOutputStream(CacheOutputCloseListener* aCloseListener,
+ nsIOutputStream** _retval);
+ NS_IMETHOD OpenAlternativeOutputStream(
+ CacheOutputCloseListener* aCloseListener, const char* aAltDataType,
+ nsIAsyncOutputStream** _retval);
+ NS_IMETHOD SetMemoryOnly();
+ NS_IMETHOD Doom(CacheFileListener* aCallback);
+
+ void Kill() { mKill = true; }
+ nsresult ThrowMemoryCachedData();
+
+ nsresult GetAltDataSize(int64_t* aSize);
+ nsresult GetAltDataType(nsACString& aType);
+
+ // metadata forwarders
+ nsresult GetElement(const char* aKey, char** _retval);
+ nsresult SetElement(const char* aKey, const char* aValue);
+ nsresult VisitMetaData(nsICacheEntryMetaDataVisitor* aVisitor);
+ nsresult ElementsSize(uint32_t* _retval);
+ nsresult SetExpirationTime(uint32_t aExpirationTime);
+ nsresult GetExpirationTime(uint32_t* _retval);
+ nsresult SetFrecency(uint32_t aFrecency);
+ nsresult GetFrecency(uint32_t* _retval);
+ nsresult SetNetworkTimes(uint64_t aOnStartTime, uint64_t aOnStopTime);
+ nsresult SetContentType(uint8_t aContentType);
+ nsresult GetOnStartTime(uint64_t* _retval);
+ nsresult GetOnStopTime(uint64_t* _retval);
+ nsresult GetLastModified(uint32_t* _retval);
+ nsresult GetLastFetched(uint32_t* _retval);
+ nsresult GetFetchCount(uint32_t* _retval);
+ nsresult GetDiskStorageSizeInKB(uint32_t* aDiskStorageSize);
+ // Called by upper layers to indicated the entry has been fetched,
+ // i.e. delivered to the consumer.
+ nsresult OnFetched();
+
+ bool DataSize(int64_t* aSize);
+ void Key(nsACString& aKey);
+ bool IsDoomed();
+ bool IsPinned();
+ // Returns true when there is a potentially unfinished write operation.
+ bool IsWriteInProgress();
+ bool EntryWouldExceedLimit(int64_t aOffset, int64_t aSize, bool aIsAltData);
+
+ // Memory reporting
+ size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
+ size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
+
+ private:
+ friend class CacheFileIOManager;
+ friend class CacheFileChunk;
+ friend class CacheFileInputStream;
+ friend class CacheFileOutputStream;
+ friend class CacheFileAutoLock;
+ friend class MetadataWriteTimer;
+
+ virtual ~CacheFile();
+
+ void Lock() MOZ_CAPABILITY_ACQUIRE() { mLock->Lock().Lock(); }
+ void Unlock() MOZ_CAPABILITY_RELEASE() {
+ // move the elements out of mObjsToRelease
+ // so that they can be released after we unlock
+ nsTArray<RefPtr<nsISupports>> objs = std::move(mObjsToRelease);
+
+ mLock->Lock().Unlock();
+ }
+ void AssertOwnsLock() const MOZ_ASSERT_CAPABILITY(this) {
+ mLock->Lock().AssertCurrentThreadOwns();
+ }
+ void ReleaseOutsideLock(RefPtr<nsISupports> aObject);
+
+ enum ECallerType { READER = 0, WRITER = 1, PRELOADER = 2 };
+
+ nsresult DoomLocked(CacheFileListener* aCallback);
+
+ nsresult GetChunkLocked(uint32_t aIndex, ECallerType aCaller,
+ CacheFileChunkListener* aCallback,
+ CacheFileChunk** _retval);
+
+ void PreloadChunks(uint32_t aIndex);
+ bool ShouldCacheChunk(uint32_t aIndex);
+ bool MustKeepCachedChunk(uint32_t aIndex);
+
+ nsresult DeactivateChunk(CacheFileChunk* aChunk);
+ void RemoveChunkInternal(CacheFileChunk* aChunk, bool aCacheChunk);
+
+ bool OutputStreamExists(bool aAlternativeData);
+ // Returns number of bytes that are available and can be read by input stream
+ // without waiting for the data. The amount is counted from the start of
+ // aIndex chunk and it is guaranteed that this data won't be released by
+ // CleanUpCachedChunks().
+ int64_t BytesFromChunk(uint32_t aIndex, bool aAlternativeData);
+ nsresult Truncate(int64_t aOffset);
+
+ void RemoveInput(CacheFileInputStream* aInput, nsresult aStatus);
+ void RemoveOutput(CacheFileOutputStream* aOutput, nsresult aStatus);
+ nsresult NotifyChunkListener(CacheFileChunkListener* aCallback,
+ nsIEventTarget* aTarget, nsresult aResult,
+ uint32_t aChunkIdx, CacheFileChunk* aChunk);
+ void QueueChunkListener(uint32_t aIndex, CacheFileChunkListener* aCallback);
+ nsresult NotifyChunkListeners(uint32_t aIndex, nsresult aResult,
+ CacheFileChunk* aChunk);
+ bool HaveChunkListeners(uint32_t aIndex);
+ void NotifyListenersAboutOutputRemoval();
+
+ bool IsDirty() MOZ_REQUIRES(this);
+ void WriteMetadataIfNeeded();
+ void WriteMetadataIfNeededLocked(bool aFireAndForget = false)
+ MOZ_REQUIRES(this);
+ void PostWriteTimer() MOZ_REQUIRES(this);
+
+ void CleanUpCachedChunks() MOZ_REQUIRES(this);
+
+ nsresult PadChunkWithZeroes(uint32_t aChunkIdx);
+
+ void SetError(nsresult aStatus);
+ nsresult SetAltMetadata(const char* aAltMetadata);
+
+ nsresult InitIndexEntry();
+
+ bool mOpeningFile MOZ_GUARDED_BY(this){false};
+ bool mReady MOZ_GUARDED_BY(this){false};
+ bool mMemoryOnly MOZ_GUARDED_BY(this){false};
+ bool mSkipSizeCheck MOZ_GUARDED_BY(this){false};
+ bool mOpenAsMemoryOnly MOZ_GUARDED_BY(this){false};
+ bool mPinned MOZ_GUARDED_BY(this){false};
+ bool mPriority MOZ_GUARDED_BY(this){false};
+ bool mDataAccessed MOZ_GUARDED_BY(this){false};
+ bool mDataIsDirty MOZ_GUARDED_BY(this){false};
+ bool mWritingMetadata MOZ_GUARDED_BY(this){false};
+ bool mPreloadWithoutInputStreams MOZ_GUARDED_BY(this){true};
+ uint32_t mPreloadChunkCount MOZ_GUARDED_BY(this){0};
+ nsresult mStatus MOZ_GUARDED_BY(this){NS_OK};
+ // Size of the whole data including eventual alternative data represenation.
+ int64_t mDataSize MOZ_GUARDED_BY(this){-1};
+
+ // If there is alternative data present, it contains size of the original
+ // data, i.e. offset where alternative data starts. Otherwise it is -1.
+ int64_t mAltDataOffset MOZ_GUARDED_BY(this){-1};
+
+ nsCString mKey MOZ_GUARDED_BY(this);
+ nsCString mAltDataType
+ MOZ_GUARDED_BY(this); // The type of the saved alt-data. May be empty.
+
+ RefPtr<CacheFileHandle> mHandle MOZ_GUARDED_BY(this);
+ RefPtr<CacheFileMetadata> mMetadata MOZ_GUARDED_BY(this);
+ nsCOMPtr<CacheFileListener> mListener MOZ_GUARDED_BY(this);
+ nsCOMPtr<CacheFileIOListener> mDoomAfterOpenListener MOZ_GUARDED_BY(this);
+ Atomic<bool, Relaxed> mKill{false};
+
+ nsRefPtrHashtable<nsUint32HashKey, CacheFileChunk> mChunks
+ MOZ_GUARDED_BY(this);
+ nsClassHashtable<nsUint32HashKey, ChunkListeners> mChunkListeners
+ MOZ_GUARDED_BY(this);
+ nsRefPtrHashtable<nsUint32HashKey, CacheFileChunk> mCachedChunks
+ MOZ_GUARDED_BY(this);
+ // We can truncate data only if there is no input/output stream beyond the
+ // truncate position, so only unused chunks can be thrown away. But it can
+ // happen that we need to throw away a chunk that is still in mChunks (i.e.
+ // an active chunk) because deactivation happens with a small delay. We cannot
+ // delete such chunk immediately but we need to ensure that such chunk won't
+ // be returned by GetChunkLocked, so we move this chunk into mDiscardedChunks
+ // and mark it as discarded.
+ nsTArray<RefPtr<CacheFileChunk>> mDiscardedChunks MOZ_GUARDED_BY(this);
+
+ nsTArray<CacheFileInputStream*> mInputs MOZ_GUARDED_BY(this);
+ CacheFileOutputStream* mOutput MOZ_GUARDED_BY(this){nullptr};
+
+ nsTArray<RefPtr<nsISupports>> mObjsToRelease MOZ_GUARDED_BY(this);
+ RefPtr<CacheFileUtils::CacheFileLock> mLock;
+};
+
+class MOZ_RAII MOZ_SCOPED_CAPABILITY CacheFileAutoLock {
+ public:
+ explicit CacheFileAutoLock(CacheFile* aFile) MOZ_CAPABILITY_ACQUIRE(aFile)
+ : mFile(aFile), mLocked(true) {
+ mFile->Lock();
+ }
+ ~CacheFileAutoLock() MOZ_CAPABILITY_RELEASE() {
+ if (mLocked) {
+ mFile->Unlock();
+ }
+ }
+ void Lock() MOZ_CAPABILITY_ACQUIRE() {
+ MOZ_ASSERT(!mLocked);
+ mFile->Lock();
+ mLocked = true;
+ }
+ void Unlock() MOZ_CAPABILITY_RELEASE() {
+ MOZ_ASSERT(mLocked);
+ mFile->Unlock();
+ mLocked = false;
+ }
+
+ private:
+ RefPtr<CacheFile> mFile;
+ bool mLocked;
+};
+
+} // namespace net
+} // namespace mozilla
+
+#endif