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91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
//* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* 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 EffectiveTLDService_h
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#define EffectiveTLDService_h
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#include "nsIEffectiveTLDService.h"
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#include "mozilla/AutoMemMap.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Dafsa.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/MruCache.h"
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#include "mozilla/RWLock.h"
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#include "nsCOMPtr.h"
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#include "nsHashKeys.h"
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#include "nsIMemoryReporter.h"
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#include "nsIObserver.h"
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#include "nsString.h"
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class nsIIDNService;
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class nsEffectiveTLDService final : public nsIEffectiveTLDService,
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public nsIObserver,
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public nsIMemoryReporter {
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIEFFECTIVETLDSERVICE
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NS_DECL_NSIMEMORYREPORTER
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NS_DECL_NSIOBSERVER
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nsEffectiveTLDService();
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nsresult Init();
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static nsEffectiveTLDService* GetInstance();
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);
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private:
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nsresult GetBaseDomainInternal(nsCString& aHostname, int32_t aAdditionalParts,
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bool aOnlyKnownPublicSuffix,
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nsACString& aBaseDomain);
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~nsEffectiveTLDService();
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// The DAFSA provides a compact encoding of the rather large eTLD list.
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mozilla::Maybe<mozilla::Dafsa> mGraph MOZ_GUARDED_BY(mGraphLock);
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// Memory map used for a new updated dafsa
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mozilla::loader::AutoMemMap mDafsaMap MOZ_GUARDED_BY(mGraphLock);
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// Lock for mGraph and mDafsaMap
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mozilla::RWLock mGraphLock;
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// Note that the cache entries here can record entries that were cached
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// successfully or unsuccessfully. mResult must be checked before using an
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// entry. If it's a success error code, the cache entry is valid and can be
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// used.
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struct TLDCacheEntry {
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nsCString mHost;
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nsCString mBaseDomain;
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nsresult mResult;
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};
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// We use a small most recently used cache to compensate for DAFSA lookups
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// being slightly slower than a binary search on a larger table of strings.
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//
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// We first check the cache for a matching result and avoid a DAFSA lookup
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// if a match is found. Otherwise we lookup the domain in the DAFSA and then
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// cache the result. During standard browsing the same domains are repeatedly
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// fed into |GetBaseDomainInternal| so this ends up being an effective
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// mitigation getting about a 99% hit rate with four tabs open.
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struct TldCache
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: public mozilla::MruCache<nsACString, TLDCacheEntry, TldCache> {
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static mozilla::HashNumber Hash(const nsACString& aKey) {
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return mozilla::HashString(aKey);
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}
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static bool Match(const nsACString& aKey, const TLDCacheEntry& aVal) {
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return aKey == aVal.mHost;
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}
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};
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// NOTE: Only used on the main thread, so not guarded by mGraphLock.
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TldCache mMruTable;
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};
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#endif // EffectiveTLDService_h
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