The Tor Browser: netwerk/cache2/CacheFileIOManager.h@6474c204b198 (annotated)

netwerk/cache2/CacheFileIOManager.h@6474c204b198 (annotated)

netwerk/cache2/CacheFileIOManager.h

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* 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 CacheFileIOManager__h__
 #define CacheFileIOManager__h__
 #include "CacheIOThread.h"
 #include "nsIEventTarget.h"
 #include "nsITimer.h"
 #include "nsCOMPtr.h"
 #include "mozilla/SHA1.h"
 #include "mozilla/TimeStamp.h"
 #include "nsTArray.h"
 #include "nsString.h"
 #include "nsTHashtable.h"
 #include "prio.h"
 //#define DEBUG_HANDLES 1
 class nsIFile;
 class nsITimer;
 class nsIDirectoryEnumerator;
 class nsILoadContextInfo;
 namespace mozilla {
 namespace net {
 class CacheFile;
 #ifdef DEBUG_HANDLES
 class CacheFileHandlesEntry;
 #endif
 const char kEntriesDir[] = "entries";
 const char kDoomedDir[]  = "doomed";
 const char kTrashDir[]   = "trash";
 class CacheFileHandle : public nsISupports
 {
 public:
   NS_DECL_THREADSAFE_ISUPPORTS
   bool DispatchRelease();
   CacheFileHandle(const SHA1Sum::Hash *aHash, bool aPriority);
   CacheFileHandle(const nsACString &aKey, bool aPriority);
   CacheFileHandle(const CacheFileHandle &aOther);
   void Log();
   bool IsDoomed() const { return mIsDoomed; }
   const SHA1Sum::Hash *Hash() const { return mHash; }
   int64_t FileSize() const { return mFileSize; }
   uint32_t FileSizeInK() const;
   bool IsPriority() const { return mPriority; }
   bool FileExists() const { return mFileExists; }
   bool IsClosed() const { return mClosed; }
   bool IsSpecialFile() const { return !mHash; }
   nsCString & Key() { return mKey; }
   // Memory reporting
   size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
   size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
 private:
   friend class CacheFileIOManager;
   friend class CacheFileHandles;
   friend class ReleaseNSPRHandleEvent;
   virtual ~CacheFileHandle();
   const SHA1Sum::Hash *mHash;
   bool                 mIsDoomed;
   bool                 mPriority;
   bool                 mClosed;
   bool                 mInvalid;
   bool                 mFileExists; // This means that the file should exists,
                                     // but it can be still deleted by OS/user
                                     // and then a subsequent OpenNSPRFileDesc()
                                     // will fail.
   nsCOMPtr<nsIFile>    mFile;
   int64_t              mFileSize;
   PRFileDesc          *mFD;  // if null then the file doesn't exists on the disk
   nsCString            mKey;
 };
 class CacheFileHandles {
 public:
   CacheFileHandles();
   ~CacheFileHandles();
   nsresult GetHandle(const SHA1Sum::Hash *aHash, bool aReturnDoomed, CacheFileHandle **_retval);
   nsresult NewHandle(const SHA1Sum::Hash *aHash, bool aPriority, CacheFileHandle **_retval);
   void     RemoveHandle(CacheFileHandle *aHandlle);
   void     GetAllHandles(nsTArray<nsRefPtr<CacheFileHandle> > *_retval);
   void     GetActiveHandles(nsTArray<nsRefPtr<CacheFileHandle> > *_retval);
   void     ClearAll();
   uint32_t HandleCount();
 #ifdef DEBUG_HANDLES
   void     Log(CacheFileHandlesEntry *entry);
 #endif
   // Memory reporting
   size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
   size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
   class HandleHashKey : public PLDHashEntryHdr
   {
   public:
     typedef const SHA1Sum::Hash& KeyType;
     typedef const SHA1Sum::Hash* KeyTypePointer;
     HandleHashKey(KeyTypePointer aKey)
     {
       MOZ_COUNT_CTOR(HandleHashKey);
       mHash = (SHA1Sum::Hash*)new uint8_t[SHA1Sum::HashSize];
       memcpy(mHash, aKey, sizeof(SHA1Sum::Hash));
     }
     HandleHashKey(const HandleHashKey& aOther)
     {
       NS_NOTREACHED("HandleHashKey copy constructor is forbidden!");
     }
     ~HandleHashKey()
     {
       MOZ_COUNT_DTOR(HandleHashKey);
     }
     bool KeyEquals(KeyTypePointer aKey) const
     {
       return memcmp(mHash, aKey, sizeof(SHA1Sum::Hash)) == 0;
     }
     static KeyTypePointer KeyToPointer(KeyType aKey)
     {
       return &aKey;
     }
     static PLDHashNumber HashKey(KeyTypePointer aKey)
     {
       return (reinterpret_cast<const uint32_t *>(aKey))[0];
     }
     void AddHandle(CacheFileHandle* aHandle);
     void RemoveHandle(CacheFileHandle* aHandle);
     already_AddRefed<CacheFileHandle> GetNewestHandle();
     void GetHandles(nsTArray<nsRefPtr<CacheFileHandle> > &aResult);
     SHA1Sum::Hash *Hash() const { return mHash; }
     bool IsEmpty() const { return mHandles.Length() == 0; }
     enum { ALLOW_MEMMOVE = true };
 #ifdef DEBUG
     void AssertHandlesState();
 #endif
     // Memory reporting
     size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
     size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
   private:
     nsAutoArrayPtr<SHA1Sum::Hash> mHash;
     // Use weak pointers since the hash table access is on a single thread
     // only and CacheFileHandle removes itself from this table in its dtor
     // that may only be called on the same thread as we work with the hashtable
     // since we dispatch its Release() to this thread.
     nsTArray<CacheFileHandle*> mHandles;
   };
 private:
   nsTHashtable<HandleHashKey> mTable;
 };
 ////////////////////////////////////////////////////////////////////////////////
 class OpenFileEvent;
 class CloseFileEvent;
 class ReadEvent;
 class WriteEvent;
 class MetadataWriteScheduleEvent;
 class CacheFileContextEvictor;
 #define CACHEFILEIOLISTENER_IID \
 { /* dcaf2ddc-17cf-4242-bca1-8c86936375a5 */       \
 xdcaf2ddc,                                      \
 x17cf,                                          \
 x4242,                                          \
   {0xbc, 0xa1, 0x8c, 0x86, 0x93, 0x63, 0x75, 0xa5} \
 }
 class CacheFileIOListener : public nsISupports
 {
 public:
   NS_DECLARE_STATIC_IID_ACCESSOR(CACHEFILEIOLISTENER_IID)
   NS_IMETHOD OnFileOpened(CacheFileHandle *aHandle, nsresult aResult) = 0;
   NS_IMETHOD OnDataWritten(CacheFileHandle *aHandle, const char *aBuf,
                            nsresult aResult) = 0;
   NS_IMETHOD OnDataRead(CacheFileHandle *aHandle, char *aBuf,
                         nsresult aResult) = 0;
   NS_IMETHOD OnFileDoomed(CacheFileHandle *aHandle, nsresult aResult) = 0;
   NS_IMETHOD OnEOFSet(CacheFileHandle *aHandle, nsresult aResult) = 0;
   NS_IMETHOD OnFileRenamed(CacheFileHandle *aHandle, nsresult aResult) = 0;
 };
 NS_DEFINE_STATIC_IID_ACCESSOR(CacheFileIOListener, CACHEFILEIOLISTENER_IID)
 class CacheFileIOManager : public nsITimerCallback
 {
 public:
   NS_DECL_THREADSAFE_ISUPPORTS
   NS_DECL_NSITIMERCALLBACK
   enum {
     OPEN         = 0U,
     CREATE       = 1U,
     CREATE_NEW   = 2U,
     PRIORITY     = 4U,
     SPECIAL_FILE = 8U
   };
   CacheFileIOManager();
   static nsresult Init();
   static nsresult Shutdown();
   static nsresult OnProfile();
   static already_AddRefed<nsIEventTarget> IOTarget();
   static already_AddRefed<CacheIOThread> IOThread();
   static bool IsOnIOThread();
   static bool IsOnIOThreadOrCeased();
   static bool IsShutdown();
   // Make aFile's WriteMetadataIfNeeded be called automatically after
   // a short interval.
   static nsresult ScheduleMetadataWrite(CacheFile * aFile);
   // Remove aFile from the scheduling registry array.
   // WriteMetadataIfNeeded will not be automatically called.
   static nsresult UnscheduleMetadataWrite(CacheFile * aFile);
   // Shuts the scheduling off and flushes all pending metadata writes.
   static nsresult ShutdownMetadataWriteScheduling();
   static nsresult OpenFile(const nsACString &aKey,
                            uint32_t aFlags, bool aResultOnAnyThread,
                            CacheFileIOListener *aCallback);
   static nsresult Read(CacheFileHandle *aHandle, int64_t aOffset,
                        char *aBuf, int32_t aCount, bool aResultOnAnyThread,
                        CacheFileIOListener *aCallback);
   static nsresult Write(CacheFileHandle *aHandle, int64_t aOffset,
                         const char *aBuf, int32_t aCount, bool aValidate,
                         CacheFileIOListener *aCallback);
   static nsresult DoomFile(CacheFileHandle *aHandle,
                            CacheFileIOListener *aCallback);
   static nsresult DoomFileByKey(const nsACString &aKey,
                                 CacheFileIOListener *aCallback);
   static nsresult ReleaseNSPRHandle(CacheFileHandle *aHandle);
   static nsresult TruncateSeekSetEOF(CacheFileHandle *aHandle,
                                      int64_t aTruncatePos, int64_t aEOFPos,
                                      CacheFileIOListener *aCallback);
   static nsresult RenameFile(CacheFileHandle *aHandle,
                              const nsACString &aNewName,
                              CacheFileIOListener *aCallback);
   static nsresult EvictIfOverLimit();
   static nsresult EvictAll();
   static nsresult EvictByContext(nsILoadContextInfo *aLoadContextInfo);
   static nsresult InitIndexEntry(CacheFileHandle *aHandle,
                                  uint32_t         aAppId,
                                  bool             aAnonymous,
                                  bool             aInBrowser);
   static nsresult UpdateIndexEntry(CacheFileHandle *aHandle,
                                    const uint32_t  *aFrecency,
                                    const uint32_t  *aExpirationTime);
   static nsresult UpdateIndexEntry();
   enum EEnumerateMode {
     ENTRIES,
     DOOMED
   };
   static void GetCacheDirectory(nsIFile** result);
   // Memory reporting
   static size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf);
   static size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf);
 private:
   friend class CacheFileHandle;
   friend class CacheFileChunk;
   friend class CacheFile;
   friend class ShutdownEvent;
   friend class OpenFileEvent;
   friend class CloseHandleEvent;
   friend class ReadEvent;
   friend class WriteEvent;
   friend class DoomFileEvent;
   friend class DoomFileByKeyEvent;
   friend class ReleaseNSPRHandleEvent;
   friend class TruncateSeekSetEOFEvent;
   friend class RenameFileEvent;
   friend class CacheIndex;
   friend class MetadataWriteScheduleEvent;
   friend class CacheFileContextEvictor;
   virtual ~CacheFileIOManager();
   nsresult InitInternal();
   nsresult ShutdownInternal();
   nsresult OpenFileInternal(const SHA1Sum::Hash *aHash,
                             const nsACString &aKey,
                             uint32_t aFlags,
                             CacheFileHandle **_retval);
   nsresult OpenSpecialFileInternal(const nsACString &aKey,
                                    uint32_t aFlags,
                                    CacheFileHandle **_retval);
   nsresult CloseHandleInternal(CacheFileHandle *aHandle);
   nsresult ReadInternal(CacheFileHandle *aHandle, int64_t aOffset,
                         char *aBuf, int32_t aCount);
   nsresult WriteInternal(CacheFileHandle *aHandle, int64_t aOffset,
                          const char *aBuf, int32_t aCount, bool aValidate);
   nsresult DoomFileInternal(CacheFileHandle *aHandle);
   nsresult DoomFileByKeyInternal(const SHA1Sum::Hash *aHash);
   nsresult ReleaseNSPRHandleInternal(CacheFileHandle *aHandle);
   nsresult TruncateSeekSetEOFInternal(CacheFileHandle *aHandle,
                                       int64_t aTruncatePos, int64_t aEOFPos);
   nsresult RenameFileInternal(CacheFileHandle *aHandle,
                               const nsACString &aNewName);
   nsresult EvictIfOverLimitInternal();
   nsresult OverLimitEvictionInternal();
   nsresult EvictAllInternal();
   nsresult EvictByContextInternal(nsILoadContextInfo *aLoadContextInfo);
   nsresult TrashDirectory(nsIFile *aFile);
   static void OnTrashTimer(nsITimer *aTimer, void *aClosure);
   nsresult StartRemovingTrash();
   nsresult RemoveTrashInternal();
   nsresult FindTrashDirToRemove();
   nsresult CreateFile(CacheFileHandle *aHandle);
   static void HashToStr(const SHA1Sum::Hash *aHash, nsACString &_retval);
   static nsresult StrToHash(const nsACString &aHash, SHA1Sum::Hash *_retval);
   nsresult GetFile(const SHA1Sum::Hash *aHash, nsIFile **_retval);
   nsresult GetSpecialFile(const nsACString &aKey, nsIFile **_retval);
   nsresult GetDoomedFile(nsIFile **_retval);
   nsresult IsEmptyDirectory(nsIFile *aFile, bool *_retval);
   nsresult CheckAndCreateDir(nsIFile *aFile, const char *aDir,
                              bool aEnsureEmptyDir);
   nsresult CreateCacheTree();
   nsresult OpenNSPRHandle(CacheFileHandle *aHandle, bool aCreate = false);
   void     NSPRHandleUsed(CacheFileHandle *aHandle);
   // Removing all cache files during shutdown
   nsresult SyncRemoveDir(nsIFile *aFile, const char *aDir);
   void     SyncRemoveAllCacheFiles();
   nsresult ScheduleMetadataWriteInternal(CacheFile * aFile);
   nsresult UnscheduleMetadataWriteInternal(CacheFile * aFile);
   nsresult ShutdownMetadataWriteSchedulingInternal();
   static nsresult CacheIndexStateChanged();
   nsresult CacheIndexStateChangedInternal();
   // Smart size calculation. UpdateSmartCacheSize() must be called on IO thread.
   // It is called in EvictIfOverLimitInternal() just before we decide whether to
   // start overlimit eviction or not and also in OverLimitEvictionInternal()
   // before we start an eviction loop.
   nsresult UpdateSmartCacheSize();
   // Memory reporting (private part)
   size_t SizeOfExcludingThisInternal(mozilla::MallocSizeOf mallocSizeOf) const;
   static CacheFileIOManager           *gInstance;
   TimeStamp                            mStartTime;
   bool                                 mShuttingDown;
   nsRefPtr<CacheIOThread>              mIOThread;
   nsCOMPtr<nsIFile>                    mCacheDirectory;
   bool                                 mTreeCreated;
   CacheFileHandles                     mHandles;
   nsTArray<CacheFileHandle *>          mHandlesByLastUsed;
   nsTArray<CacheFileHandle *>          mSpecialHandles;
   nsTArray<nsRefPtr<CacheFile> >       mScheduledMetadataWrites;
   nsCOMPtr<nsITimer>                   mMetadataWritesTimer;
   bool                                 mOverLimitEvicting;
   bool                                 mRemovingTrashDirs;
   nsCOMPtr<nsITimer>                   mTrashTimer;
   nsCOMPtr<nsIFile>                    mTrashDir;
   nsCOMPtr<nsIDirectoryEnumerator>     mTrashDirEnumerator;
   nsTArray<nsCString>                  mFailedTrashDirs;
   nsRefPtr<CacheFileContextEvictor>    mContextEvictor;
   TimeStamp                            mLastSmartSizeTime;
 };
 } // net
 } // mozilla
 #endif

The Tor Browser / annotate

netwerk/cache2/CacheFileIOManager.h@6474c204b198 (annotated)

netwerk/cache2/CacheFileIOManager.h