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gecko-dev/netwerk/cache2/CacheFileIOManager.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 CacheFileIOManager__h__
#define CacheFileIOManager__h__
#include "CacheIOThread.h"
#include "CacheStorageService.h"
#include "CacheHashUtils.h"
#include "nsIEventTarget.h"
#include "nsINamed.h"
#include "nsITimer.h"
#include "nsCOMPtr.h"
#include "mozilla/Atomics.h"
#include "mozilla/SHA1.h"
#include "mozilla/StaticPtr.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;
class CacheFileIOListener;
#ifdef DEBUG_HANDLES
class CacheFileHandlesEntry;
#endif
#define ENTRIES_DIR "entries"
#define DOOMED_DIR "doomed"
#define TRASH_DIR "trash"
class CacheFileHandle final : public nsISupports
{
public:
enum class PinningStatus : uint32_t {
UNKNOWN,
NON_PINNED,
PINNED
};
NS_DECL_THREADSAFE_ISUPPORTS
bool DispatchRelease();
CacheFileHandle(const SHA1Sum::Hash *aHash, bool aPriority, PinningStatus aPinning);
CacheFileHandle(const nsACString &aKey, bool aPriority, PinningStatus aPinning);
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 mSpecialFile; }
nsCString & Key() { return mKey; }
// Returns false when this handle has been doomed based on the pinning state update.
bool SetPinned(bool aPinned);
void SetInvalid() { mInvalid = true; }
// 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;
mozilla::Atomic<bool, ReleaseAcquire> mIsDoomed;
mozilla::Atomic<bool, ReleaseAcquire> mClosed;
// mPriority and mSpecialFile are plain "bool", not "bool:1", so as to
// avoid bitfield races with the byte containing mInvalid et al. See
// bug 1278502.
bool const mPriority;
bool const mSpecialFile;
mozilla::Atomic<bool, Relaxed> mInvalid;
// These bit flags are all accessed only on the IO thread
bool mFileExists : 1; // This means that the file should exists,
// but it can be still deleted by OS/user
// and then a subsequent OpenNSPRFileDesc()
// will fail.
// Both initially false. Can be raised to true only when this handle is to be doomed
// during the period when the pinning status is unknown. After the pinning status
// determination we check these flags and possibly doom.
// These flags are only accessed on the IO thread.
bool mDoomWhenFoundPinned : 1;
bool mDoomWhenFoundNonPinned : 1;
// Set when after shutdown AND:
// - when writing: writing data (not metadata) OR the physical file handle is not currently open
// - when truncating: the physical file handle is not currently open
// When set it prevents any further writes or truncates on such handles to happen immediately
// after shutdown and gives a chance to write metadata of already open files quickly as possible
// (only that renders them actually usable by the cache.)
bool mKilled : 1;
// For existing files this is always pre-set to UNKNOWN. The status is udpated accordingly
// after the matadata has been parsed.
// For new files the flag is set according to which storage kind is opening
// the cache entry and remains so for the handle's lifetime.
// The status can only change from UNKNOWN (if set so initially) to one of PINNED or NON_PINNED
// and it stays unchanged afterwards.
// This status is only accessed on the IO thread.
PinningStatus mPinning;
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, CacheFileHandle **_retval);
nsresult NewHandle(const SHA1Sum::Hash *aHash, bool aPriority,
CacheFileHandle::PinningStatus aPinning, CacheFileHandle **_retval);
void RemoveHandle(CacheFileHandle *aHandlle);
void GetAllHandles(nsTArray<RefPtr<CacheFileHandle> > *_retval);
void GetActiveHandles(nsTArray<RefPtr<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;
explicit HandleHashKey(KeyTypePointer aKey)
{
MOZ_COUNT_CTOR(HandleHashKey);
mHash = MakeUnique<uint8_t[]>(SHA1Sum::kHashSize);
memcpy(mHash.get(), 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.get(), 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<RefPtr<CacheFileHandle> > &aResult);
SHA1Sum::Hash *Hash() const
{
return reinterpret_cast<SHA1Sum::Hash*>(mHash.get());
}
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:
// We can't make this UniquePtr<SHA1Sum::Hash>, because you can't have
// UniquePtrs with known bounds. So we settle for this representation
// and using appropriate casts when we need to access it as a
// SHA1Sum::Hash.
UniquePtr<uint8_t[]> 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 ReadEvent;
class WriteEvent;
class MetadataWriteScheduleEvent;
class CacheFileContextEvictor;
#define CACHEFILEIOLISTENER_IID \
{ /* dcaf2ddc-17cf-4242-bca1-8c86936375a5 */ \
0xdcaf2ddc, \
0x17cf, \
0x4242, \
{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;
virtual bool IsKilled() { return false; }
};
NS_DEFINE_STATIC_IID_ACCESSOR(CacheFileIOListener, CACHEFILEIOLISTENER_IID)
class CacheFileIOManager final
: public nsITimerCallback
, public nsINamed
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSITIMERCALLBACK
NS_DECL_NSINAMED
enum {
OPEN = 0U,
CREATE = 1U,
CREATE_NEW = 2U,
PRIORITY = 4U,
SPECIAL_FILE = 8U,
PINNED = 16U
};
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, CacheFileIOListener *aCallback);
static nsresult Read(CacheFileHandle *aHandle, int64_t aOffset,
char *aBuf, int32_t aCount,
CacheFileIOListener *aCallback);
static nsresult Write(CacheFileHandle *aHandle, int64_t aOffset,
const char *aBuf, int32_t aCount, bool aValidate,
bool aTruncate, CacheFileIOListener *aCallback);
// PinningDoomRestriction:
// NO_RESTRICTION
// no restriction is checked, the file is simply always doomed
// DOOM_WHEN_(NON)_PINNED, we branch based on the pinning status of the handle:
// UNKNOWN: the handle is marked to be doomed when later found (non)pinned
// PINNED/NON_PINNED: doom only when the restriction matches the pin status
// and the handle has not yet been required to doom during the UNKNOWN
// period
enum PinningDoomRestriction {
NO_RESTRICTION,
DOOM_WHEN_NON_PINNED,
DOOM_WHEN_PINNED
};
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,
bool aPinning);
static nsresult InitIndexEntry(CacheFileHandle *aHandle,
OriginAttrsHash aOriginAttrsHash,
bool aAnonymous,
bool aPinning);
static nsresult UpdateIndexEntry(CacheFileHandle *aHandle,
const uint32_t *aFrecency,
const uint32_t *aExpirationTime,
const bool *aHasAltData,
const uint16_t *aOnStartTime,
const uint16_t *aOnStopTime);
static nsresult UpdateIndexEntry();
enum EEnumerateMode {
ENTRIES,
DOOMED
};
static void GetCacheDirectory(nsIFile** result);
#if defined(MOZ_WIDGET_ANDROID)
static void GetProfilelessCacheDirectory(nsIFile** result);
#endif
// Calls synchronously OnEntryInfo for an entry with the given hash.
// Tries to find an existing entry in the service hashtables first, if not
// found, loads synchronously from disk file.
// Callable on the IO thread only.
static nsresult GetEntryInfo(const SHA1Sum::Hash *aHash,
CacheStorageService::EntryInfoCallback *aCallback);
// 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,
bool aTruncate);
nsresult DoomFileInternal(CacheFileHandle *aHandle,
PinningDoomRestriction aPinningStatusRestriction = NO_RESTRICTION);
nsresult DoomFileByKeyInternal(const SHA1Sum::Hash *aHash);
nsresult MaybeReleaseNSPRHandleInternal(CacheFileHandle *aHandle,
bool aIgnoreShutdownLag = false);
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,
bool aPinning);
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(int64_t aFreeSpace);
// Memory reporting (private part)
size_t SizeOfExcludingThisInternal(mozilla::MallocSizeOf mallocSizeOf) const;
static StaticRefPtr<CacheFileIOManager> gInstance;
TimeStamp mStartTime;
// Set true on the IO thread, CLOSE level as part of the internal shutdown
// procedure.
bool mShuttingDown;
RefPtr<CacheIOThread> mIOThread;
nsCOMPtr<nsIFile> mCacheDirectory;
#if defined(MOZ_WIDGET_ANDROID)
// On Android we add the active profile directory name between the path
// and the 'cache2' leaf name. However, to delete any leftover data from
// times before we were doing it, we still need to access the directory
// w/o the profile name in the path. Here it is stored.
nsCOMPtr<nsIFile> mCacheProfilelessDirectory;
#endif
bool mTreeCreated;
bool mTreeCreationFailed;
CacheFileHandles mHandles;
nsTArray<CacheFileHandle *> mHandlesByLastUsed;
nsTArray<CacheFileHandle *> mSpecialHandles;
nsTArray<RefPtr<CacheFile> > mScheduledMetadataWrites;
nsCOMPtr<nsITimer> mMetadataWritesTimer;
bool mOverLimitEvicting;
// When overlimit eviction is too slow and cache size reaches 105% of the
// limit, this flag is set and no other content is cached to prevent
// uncontrolled cache growing.
bool mCacheSizeOnHardLimit;
bool mRemovingTrashDirs;
nsCOMPtr<nsITimer> mTrashTimer;
nsCOMPtr<nsIFile> mTrashDir;
nsCOMPtr<nsIDirectoryEnumerator> mTrashDirEnumerator;
nsTArray<nsCString> mFailedTrashDirs;
RefPtr<CacheFileContextEvictor> mContextEvictor;
TimeStamp mLastSmartSizeTime;
};
} // namespace net
} // namespace mozilla
#endif
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