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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 CacheStorageService__h__
+#define CacheStorageService__h__
+
+#include "mozilla/LinkedList.h"
+#include "nsICacheStorageService.h"
+#include "nsIMemoryReporter.h"
+#include "nsINamed.h"
+#include "nsITimer.h"
+#include "nsICacheTesting.h"
+
+#include "nsClassHashtable.h"
+#include "nsTHashMap.h"
+#include "nsString.h"
+#include "nsThreadUtils.h"
+#include "nsProxyRelease.h"
+#include "mozilla/Monitor.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/AtomicBitfields.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/TimeStamp.h"
+#include "nsTArray.h"
+
+class nsIURI;
+class nsICacheEntryDoomCallback;
+class nsICacheStorageVisitor;
+class nsIRunnable;
+class nsIThread;
+class nsIEventTarget;
+
+namespace mozilla {
+
+class OriginAttributes;
+
+namespace net {
+
+class CacheStorageService;
+class CacheStorage;
+class CacheEntry;
+class CacheEntryHandle;
+
+class CacheMemoryConsumer {
+ private:
+ friend class CacheStorageService;
+ // clang-format off
+ MOZ_ATOMIC_BITFIELDS(mAtomicBitfields, 32, (
+ (uint32_t, ReportedMemoryConsumption, 30),
+ (uint32_t, Flags, 2)
+ ))
+ // clang-format on
+
+ private:
+ CacheMemoryConsumer() = delete;
+
+ protected:
+ enum {
+ // No special treatment, reports always to the disk-entries pool.
+ NORMAL = 0,
+ // This consumer is belonging to a memory-only cache entry, used to decide
+ // which of the two disk and memory pools count this consumption at.
+ MEMORY_ONLY = 1 << 0,
+ // Prevent reports of this consumer at all, used for disk data chunks since
+ // we throw them away as soon as the entry is not used by any consumer and
+ // don't want to make them wipe the whole pool out during their short life.
+ DONT_REPORT = 1 << 1
+ };
+
+ explicit CacheMemoryConsumer(uint32_t aFlags);
+ ~CacheMemoryConsumer() { DoMemoryReport(0); }
+ void DoMemoryReport(uint32_t aCurrentSize);
+};
+
+class CacheStorageService final : public nsICacheStorageService,
+ public nsIMemoryReporter,
+ public nsITimerCallback,
+ public nsICacheTesting,
+ public nsINamed {
+ public:
+ NS_DECL_THREADSAFE_ISUPPORTS
+ NS_DECL_NSICACHESTORAGESERVICE
+ NS_DECL_NSIMEMORYREPORTER
+ NS_DECL_NSITIMERCALLBACK
+ NS_DECL_NSICACHETESTING
+ NS_DECL_NSINAMED
+
+ CacheStorageService();
+
+ void Shutdown();
+ void DropPrivateBrowsingEntries();
+
+ static CacheStorageService* Self() { return sSelf; }
+ static nsISupports* SelfISupports() {
+ return static_cast<nsICacheStorageService*>(Self());
+ }
+ nsresult Dispatch(nsIRunnable* aEvent);
+ static bool IsRunning() { return sSelf && !sSelf->mShutdown; }
+ static bool IsOnManagementThread();
+ already_AddRefed<nsIEventTarget> Thread() const;
+ mozilla::Mutex& Lock() { return mLock; }
+
+ // Tracks entries that may be forced valid in a pruned hashtable.
+ struct ForcedValidData {
+ // The timestamp is computed when the entry gets inserted into the map.
+ // It should never be null for an entry in the map.
+ TimeStamp validUntil;
+ // viewed gets set to true by a call to MarkForcedValidEntryUse()
+ bool viewed = false;
+ };
+ nsTHashMap<nsCStringHashKey, ForcedValidData> mForcedValidEntries;
+ void ForcedValidEntriesPrune(TimeStamp& now);
+
+ // Helper thread-safe interface to pass entry info, only difference from
+ // nsICacheStorageVisitor is that instead of nsIURI only the uri spec is
+ // passed.
+ class EntryInfoCallback {
+ public:
+ virtual void OnEntryInfo(const nsACString& aURISpec,
+ const nsACString& aIdEnhance, int64_t aDataSize,
+ int64_t aAltDataSize, uint32_t aFetchCount,
+ uint32_t aLastModifiedTime,
+ uint32_t aExpirationTime, bool aPinned,
+ nsILoadContextInfo* aInfo) = 0;
+ };
+
+ // Invokes OnEntryInfo for the given aEntry, synchronously.
+ static void GetCacheEntryInfo(CacheEntry* aEntry,
+ EntryInfoCallback* aCallback);
+
+ nsresult GetCacheIndexEntryAttrs(CacheStorage const* aStorage,
+ const nsACString& aURI,
+ const nsACString& aIdExtension,
+ bool* aHasAltData, uint32_t* aFileSizeKb);
+
+ static uint32_t CacheQueueSize(bool highPriority);
+
+ // Memory reporting
+ size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
+ size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
+ MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOf)
+
+ private:
+ virtual ~CacheStorageService();
+ void ShutdownBackground();
+
+ private:
+ // The following methods may only be called on the management
+ // thread.
+ friend class CacheEntry;
+
+ /**
+ * Registers the entry into the associated MemoryPool.
+ * Holds a strong reference until it is unregistered.
+ */
+ void RegisterEntry(CacheEntry* aEntry);
+
+ /**
+ * Deregisters the entry from the associated MemoryPool.
+ */
+ void UnregisterEntry(CacheEntry* aEntry);
+
+ /**
+ * Removes the entry from the related entry hash table, if still present.
+ */
+ bool RemoveEntry(CacheEntry* aEntry, bool aOnlyUnreferenced = false);
+
+ /**
+ * Tells the storage service whether this entry is only to be stored in
+ * memory.
+ */
+ void RecordMemoryOnlyEntry(CacheEntry* aEntry, bool aOnlyInMemory,
+ bool aOverwrite);
+
+ /**
+ * Sets a cache entry valid (overrides the default loading behavior by loading
+ * directly from cache) for the given number of seconds
+ * See nsICacheEntry.idl for more details
+ */
+ void ForceEntryValidFor(nsACString const& aContextKey,
+ nsACString const& aEntryKey,
+ uint32_t aSecondsToTheFuture);
+
+ /**
+ * Remove the validity info
+ */
+ void RemoveEntryForceValid(nsACString const& aContextKey,
+ nsACString const& aEntryKey);
+
+ /**
+ * Retrieves the status of the cache entry to see if it has been forced valid
+ * (so it will loaded directly from cache without further validation)
+ */
+ bool IsForcedValidEntry(nsACString const& aContextKey,
+ nsACString const& aEntryKey);
+
+ // Marks the entry as used, so we may properly report when it gets evicted
+ // if the prefetched resource was used or not.
+ void MarkForcedValidEntryUse(nsACString const& aContextKey,
+ nsACString const& aEntryKey);
+
+ private:
+ friend class CacheIndex;
+
+ /**
+ * CacheIndex uses this to prevent a cache entry from being prememptively
+ * thrown away when forced valid
+ * See nsICacheEntry.idl for more details
+ */
+ bool IsForcedValidEntry(nsACString const& aContextEntryKey);
+
+ private:
+ // These are helpers for telemetry monitoring of the memory pools.
+ void TelemetryPrune(TimeStamp& now);
+ void TelemetryRecordEntryCreation(CacheEntry const* entry);
+ void TelemetryRecordEntryRemoval(CacheEntry* entry);
+
+ private:
+ // Following methods are thread safe to call.
+ friend class CacheStorage;
+
+ /**
+ * Get, or create when not existing and demanded, an entry for the storage
+ * and uri+id extension.
+ */
+ nsresult AddStorageEntry(CacheStorage const* aStorage, const nsACString& aURI,
+ const nsACString& aIdExtension, uint32_t aFlags,
+ CacheEntryHandle** aResult);
+
+ /**
+ * Check existance of an entry. This may throw NS_ERROR_NOT_AVAILABLE
+ * when the information cannot be obtained synchronously w/o blocking.
+ */
+ nsresult CheckStorageEntry(CacheStorage const* aStorage,
+ const nsACString& aURI,
+ const nsACString& aIdExtension, bool* aResult);
+
+ /**
+ * Removes the entry from the related entry hash table, if still present
+ * and returns it.
+ */
+ nsresult DoomStorageEntry(CacheStorage const* aStorage,
+ const nsACString& aURI,
+ const nsACString& aIdExtension,
+ nsICacheEntryDoomCallback* aCallback);
+
+ /**
+ * Removes and returns entry table for the storage.
+ */
+ nsresult DoomStorageEntries(CacheStorage const* aStorage,
+ nsICacheEntryDoomCallback* aCallback);
+
+ /**
+ * Walk all entiries beloging to the storage.
+ */
+ nsresult WalkStorageEntries(CacheStorage const* aStorage, bool aVisitEntries,
+ nsICacheStorageVisitor* aVisitor);
+
+ private:
+ friend class CacheFileIOManager;
+
+ /**
+ * CacheFileIOManager uses this method to notify CacheStorageService that
+ * an active entry was removed. This method is called even if the entry
+ * removal was originated by CacheStorageService.
+ */
+ void CacheFileDoomed(nsILoadContextInfo* aLoadContextInfo,
+ const nsACString& aIdExtension,
+ const nsACString& aURISpec);
+
+ /**
+ * Tries to find an existing entry in the hashtables and synchronously call
+ * OnCacheEntryInfo of the aVisitor callback when found.
+ * @retuns
+ * true, when the entry has been found that also implies the callbacks has
+ * beem invoked
+ * false, when an entry has not been found
+ */
+ bool GetCacheEntryInfo(nsILoadContextInfo* aLoadContextInfo,
+ const nsACString& aIdExtension,
+ const nsACString& aURISpec,
+ EntryInfoCallback* aCallback);
+
+ private:
+ friend class CacheMemoryConsumer;
+
+ /**
+ * When memory consumption of this entry radically changes, this method
+ * is called to reflect the size of allocated memory. This call may purge
+ * unspecified number of entries from memory (but not from disk).
+ */
+ void OnMemoryConsumptionChange(CacheMemoryConsumer* aConsumer,
+ uint32_t aCurrentMemoryConsumption);
+
+ /**
+ * If not already pending, it schedules mPurgeTimer that fires after 1 second
+ * and dispatches PurgeOverMemoryLimit().
+ */
+ void SchedulePurgeOverMemoryLimit();
+
+ /**
+ * Called on the management thread, removes all expired and then least used
+ * entries from the memory, first from the disk pool and then from the memory
+ * pool.
+ */
+ void PurgeExpiredOrOverMemoryLimit();
+
+ private:
+ nsresult DoomStorageEntries(const nsACString& aContextKey,
+ nsILoadContextInfo* aContext, bool aDiskStorage,
+ bool aPin, nsICacheEntryDoomCallback* aCallback);
+ nsresult AddStorageEntry(const nsACString& aContextKey,
+ const nsACString& aURI,
+ const nsACString& aIdExtension, bool aWriteToDisk,
+ bool aSkipSizeCheck, bool aPin, uint32_t aFlags,
+ CacheEntryHandle** aResult);
+
+ nsresult ClearOriginInternal(
+ const nsAString& aOrigin,
+ const mozilla::OriginAttributes& aOriginAttributes, bool aAnonymous);
+
+ static CacheStorageService* sSelf;
+
+ mozilla::Mutex mLock MOZ_UNANNOTATED{"CacheStorageService.mLock"};
+ mozilla::Mutex mForcedValidEntriesLock{
+ "CacheStorageService.mForcedValidEntriesLock"};
+
+ Atomic<bool, Relaxed> mShutdown{false};
+
+ // Accessible only on the service thread
+ class MemoryPool {
+ public:
+ enum EType {
+ DISK,
+ MEMORY,
+ } mType;
+
+ explicit MemoryPool(EType aType);
+ ~MemoryPool();
+
+ // We want to have constant O(1) for removal from this list.
+ LinkedList<RefPtr<CacheEntry>> mManagedEntries;
+ Atomic<uint32_t, Relaxed> mMemorySize{0};
+
+ bool OnMemoryConsumptionChange(uint32_t aSavedMemorySize,
+ uint32_t aCurrentMemoryConsumption);
+ /**
+ * Purges entries from memory based on the frecency ordered array.
+ */
+ void PurgeExpiredOrOverMemoryLimit();
+ size_t PurgeExpired();
+ Result<size_t, nsresult> PurgeByFrecency();
+ size_t PurgeAll(uint32_t aWhat);
+
+ private:
+ uint32_t Limit() const;
+ MemoryPool() = delete;
+ };
+
+ MemoryPool mDiskPool{MemoryPool::DISK};
+ MemoryPool mMemoryPool{MemoryPool::MEMORY};
+ TimeStamp mLastPurgeTime;
+ MemoryPool& Pool(bool aUsingDisk) {
+ return aUsingDisk ? mDiskPool : mMemoryPool;
+ }
+ MemoryPool const& Pool(bool aUsingDisk) const {
+ return aUsingDisk ? mDiskPool : mMemoryPool;
+ }
+
+ nsCOMPtr<nsITimer> mPurgeTimer;
+#ifdef MOZ_TSAN
+ // In OnMemoryConsumptionChange() we check whether the timer exists, but we
+ // cannot grab the lock there (see comment 6 in bug 1614637) and TSan reports
+ // a data race. This data race is harmless, so we use this atomic flag only in
+ // TSan build to suppress it.
+ Atomic<bool, Relaxed> mPurgeTimerActive{false};
+#endif
+
+ class PurgeFromMemoryRunnable : public Runnable {
+ public:
+ PurgeFromMemoryRunnable(CacheStorageService* aService, uint32_t aWhat)
+ : Runnable("net::CacheStorageService::PurgeFromMemoryRunnable"),
+ mService(aService),
+ mWhat(aWhat) {}
+
+ private:
+ virtual ~PurgeFromMemoryRunnable() = default;
+
+ NS_IMETHOD Run() override;
+
+ RefPtr<CacheStorageService> mService;
+ uint32_t mWhat;
+ };
+
+ // Used just for telemetry purposes, accessed only on the management thread.
+ // Note: not included in the memory reporter, this is not expected to be huge
+ // and also would be complicated to report since reporting happens on the main
+ // thread but this table is manipulated on the management thread.
+ nsTHashMap<nsCStringHashKey, mozilla::TimeStamp> mPurgeTimeStamps;
+
+ // nsICacheTesting
+ class IOThreadSuspender : public Runnable {
+ public:
+ IOThreadSuspender()
+ : Runnable("net::CacheStorageService::IOThreadSuspender"),
+ mMon("IOThreadSuspender") {}
+ void Notify();
+
+ private:
+ virtual ~IOThreadSuspender() = default;
+ NS_IMETHOD Run() override;
+
+ Monitor mMon MOZ_UNANNOTATED;
+ bool mSignaled{false};
+ };
+
+ RefPtr<IOThreadSuspender> mActiveIOSuspender;
+};
+
+template <class T>
+void ProxyRelease(const char* aName, nsCOMPtr<T>& object,
+ nsIEventTarget* target) {
+ NS_ProxyRelease(aName, target, object.forget());
+}
+
+template <class T>
+void ProxyReleaseMainThread(const char* aName, nsCOMPtr<T>& object) {
+ ProxyRelease(aName, object, GetMainThreadSerialEventTarget());
+}
+
+} // namespace net
+} // namespace mozilla
+
+#define NS_CACHE_STORAGE_SERVICE_CID \
+ { \
+ 0xea70b098, 0x5014, 0x4e21, { \
+ 0xae, 0xe1, 0x75, 0xe6, 0xb2, 0xc4, 0xb8, 0xe0 \
+ } \
+ }
+
+#define NS_CACHE_STORAGE_SERVICE_CONTRACTID \
+ "@mozilla.org/netwerk/cache-storage-service;1"
+
+#define NS_CACHE_STORAGE_SERVICE_CONTRACTID2 \
+ "@mozilla.org/network/cache-storage-service;1"
+
+#endif