2 Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
3 Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
4 Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
5 Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
17 You should have received a copy of the GNU Library General Public License
18 along with this library; see the file COPYING.LIB. If not, write to
19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA.
22 This class provides all functionality needed for loading images, style sheets and html
23 pages from the web. It has a memory cache for these objects.
26 #ifndef ResourceFetcher_h
27 #define ResourceFetcher_h
29 #include "core/fetch/CachePolicy.h"
30 #include "core/fetch/FetchInitiatorInfo.h"
31 #include "core/fetch/FetchRequest.h"
32 #include "core/fetch/Resource.h"
33 #include "core/fetch/ResourceLoaderHost.h"
34 #include "core/fetch/ResourceLoaderOptions.h"
35 #include "core/fetch/ResourcePtr.h"
36 #include "platform/Timer.h"
37 #include "wtf/Deque.h"
38 #include "wtf/HashMap.h"
39 #include "wtf/HashSet.h"
40 #include "wtf/ListHashSet.h"
41 #include "wtf/text/StringHash.h"
45 class CSSStyleSheetResource;
46 class DocumentResource;
53 class XSLStyleSheetResource;
59 class ResourceTimingInfo;
60 class ResourceLoaderSet;
62 // The ResourceFetcher provides a per-context interface to the MemoryCache
63 // and enforces a bunch of security checks and rules for resource revalidation.
64 // Its lifetime is roughly per-DocumentLoader, in that it is generally created
65 // in the DocumentLoader constructor and loses its ability to generate network
66 // requests when the DocumentLoader is destroyed. Documents also hold a
67 // RefPtr<ResourceFetcher> for their lifetime (and will create one if they
68 // are initialized without a LocalFrame), so a Document can keep a ResourceFetcher
69 // alive past detach if scripts still reference the Document.
70 class ResourceFetcher final : public RefCountedWillBeGarbageCollectedFinalized<ResourceFetcher>, public ResourceLoaderHost {
71 WTF_MAKE_NONCOPYABLE(ResourceFetcher); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
72 WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ResourceFetcher);
73 friend class ImageLoader;
74 friend class ResourceCacheValidationSuppressor;
77 static PassRefPtrWillBeRawPtr<ResourceFetcher> create(DocumentLoader* documentLoader) { return adoptRefWillBeNoop(new ResourceFetcher(documentLoader)); }
78 virtual ~ResourceFetcher();
79 virtual void trace(Visitor*);
82 using RefCounted<ResourceFetcher>::ref;
83 using RefCounted<ResourceFetcher>::deref;
86 ResourcePtr<Resource> fetchSynchronously(FetchRequest&);
87 ResourcePtr<ImageResource> fetchImage(FetchRequest&);
88 ResourcePtr<CSSStyleSheetResource> fetchCSSStyleSheet(FetchRequest&);
89 ResourcePtr<ScriptResource> fetchScript(FetchRequest&);
90 ResourcePtr<FontResource> fetchFont(FetchRequest&);
91 ResourcePtr<RawResource> fetchRawResource(FetchRequest&);
92 ResourcePtr<RawResource> fetchMainResource(FetchRequest&, const SubstituteData&);
93 ResourcePtr<DocumentResource> fetchSVGDocument(FetchRequest&);
94 ResourcePtr<XSLStyleSheetResource> fetchXSLStyleSheet(FetchRequest&);
95 ResourcePtr<Resource> fetchLinkResource(Resource::Type, FetchRequest&);
96 ResourcePtr<RawResource> fetchImport(FetchRequest&);
97 ResourcePtr<RawResource> fetchMedia(FetchRequest&);
98 ResourcePtr<RawResource> fetchTextTrack(FetchRequest&);
100 // Logs an access denied message to the console for the specified URL.
101 void printAccessDeniedMessage(const KURL&) const;
103 Resource* cachedResource(const KURL&) const;
105 typedef HashMap<String, ResourcePtr<Resource>> DocumentResourceMap;
106 const DocumentResourceMap& allResources() const { return m_documentResources; }
108 bool autoLoadImages() const { return m_autoLoadImages; }
109 void setAutoLoadImages(bool);
111 void setImagesEnabled(bool);
113 bool shouldDeferImageLoad(const KURL&) const;
115 LocalFrame* frame() const; // Can be null
116 FetchContext& context() const;
117 Document* document() const { return m_document; } // Can be null
118 void setDocument(RawPtr<Document> document) { m_document = document; }
120 DocumentLoader* documentLoader() const { return m_documentLoader; }
121 void clearDocumentLoader() { m_documentLoader = nullptr; }
123 void garbageCollectDocumentResources();
125 int requestCount() const { return m_requestCount; }
127 bool isPreloaded(const String& urlString) const;
128 void clearPreloads();
129 void preload(Resource::Type, FetchRequest&, const String& charset);
130 void printPreloadStats();
132 void setDefersLoading(bool);
134 bool isFetching() const;
136 // ResourceLoaderHost
137 virtual void incrementRequestCount(const Resource*) override;
138 virtual void decrementRequestCount(const Resource*) override;
139 virtual void didLoadResource() override;
140 virtual void redirectReceived(Resource*, const ResourceResponse&) override;
141 virtual void didFinishLoading(Resource*, double finishTime, int64_t encodedDataLength) override;
142 virtual void didChangeLoadingPriority(const Resource*, ResourceLoadPriority, int intraPriorityValue) override;
143 virtual void didFailLoading(const Resource*, const ResourceError&) override;
144 virtual void willSendRequest(unsigned long identifier, ResourceRequest&, const ResourceResponse& redirectResponse, const FetchInitiatorInfo&) override;
145 virtual void didReceiveResponse(const Resource*, const ResourceResponse&) override;
146 virtual void didReceiveData(const Resource*, const char* data, int dataLength, int encodedDataLength) override;
147 virtual void didDownloadData(const Resource*, int dataLength, int encodedDataLength) override;
148 virtual void subresourceLoaderFinishedLoadingOnePart(ResourceLoader*) override;
149 virtual void didInitializeResourceLoader(ResourceLoader*) override;
150 virtual void willTerminateResourceLoader(ResourceLoader*) override;
151 virtual void willStartLoadingResource(Resource*, ResourceRequest&) override;
152 virtual bool defersLoading() const override;
153 virtual bool isLoadedBy(ResourceLoaderHost*) const override;
154 virtual bool canAccessRedirect(Resource*, ResourceRequest&, const ResourceResponse&, ResourceLoaderOptions&) override;
155 virtual bool canAccessResource(Resource*, SecurityOrigin*, const KURL&) const override;
156 virtual bool isControlledByServiceWorker() const override;
159 virtual void refResourceLoaderHost() override;
160 virtual void derefResourceLoaderHost() override;
163 int64_t serviceWorkerID() const;
165 enum ResourceLoadStartType {
166 ResourceLoadingFromNetwork,
167 ResourceLoadingFromCache
169 void maybeNotifyInsecureContent(const Resource*) const;
170 void requestLoadStarted(Resource*, const FetchRequest&, ResourceLoadStartType);
171 static const ResourceLoaderOptions& defaultResourceOptions();
173 String getCacheIdentifier() const;
176 explicit ResourceFetcher(DocumentLoader*);
178 bool shouldLoadNewResource(Resource::Type) const;
180 ResourcePtr<Resource> requestResource(Resource::Type, FetchRequest&);
181 ResourcePtr<Resource> createResourceForRevalidation(const FetchRequest&, Resource*);
182 ResourcePtr<Resource> createResourceForLoading(Resource::Type, FetchRequest&, const String& charset);
183 void preCacheDataURIImage(const FetchRequest&);
184 void preCacheSubstituteDataForMainResource(const FetchRequest&, const SubstituteData&);
185 void storeResourceTimingInitiatorInformation(Resource*);
186 void requestPreload(Resource::Type, FetchRequest&, const String& charset);
188 enum RevalidationPolicy { Use, Revalidate, Reload, Load };
189 RevalidationPolicy determineRevalidationPolicy(Resource::Type, const FetchRequest&, Resource* existingResource) const;
191 void determineRequestContext(ResourceRequest&, Resource::Type);
192 ResourceRequestCachePolicy resourceRequestCachePolicy(const ResourceRequest&, Resource::Type);
193 void addAdditionalRequestHeaders(ResourceRequest&, Resource::Type);
195 bool canRequest(Resource::Type, const ResourceRequest&, const KURL&, const ResourceLoaderOptions&, bool forPreload, FetchRequest::OriginRestriction) const;
197 static bool resourceNeedsLoad(Resource*, const FetchRequest&, RevalidationPolicy);
199 void notifyLoadedFromMemoryCache(Resource*);
201 void garbageCollectDocumentResourcesTimerFired(Timer<ResourceFetcher>*);
202 void scheduleDocumentResourcesGC();
204 void resourceTimingReportTimerFired(Timer<ResourceFetcher>*);
206 bool clientDefersImage(const KURL&) const;
207 void reloadImagesIfNotDeferred();
209 HashSet<String> m_validatedURLs;
210 mutable DocumentResourceMap m_documentResources;
211 // FIXME: Oilpan: Ideally this should just be a traced Member but that will
212 // currently leak because RenderStyle and its data are not on the heap.
213 // See crbug.com/383860 for details.
214 RawPtrWillBeWeakMember<Document> m_document;
215 DocumentLoader* m_documentLoader;
219 OwnPtr<ListHashSet<Resource*>> m_preloads;
221 Timer<ResourceFetcher> m_garbageCollectDocumentResourcesTimer;
222 Timer<ResourceFetcher> m_resourceTimingReportTimer;
224 typedef HashMap<Resource*, RefPtr<ResourceTimingInfo>> ResourceTimingInfoMap;
225 ResourceTimingInfoMap m_resourceTimingInfoMap;
227 HashMap<RefPtr<ResourceTimingInfo>, bool> m_scheduledResourceTimingReports;
229 OwnPtrWillBeMember<ResourceLoaderSet> m_loaders;
230 OwnPtrWillBeMember<ResourceLoaderSet> m_multipartLoaders;
232 // Used in hit rate histograms.
233 class DeadResourceStatsRecorder {
235 DeadResourceStatsRecorder();
236 ~DeadResourceStatsRecorder();
238 void update(RevalidationPolicy);
242 int m_revalidateCount;
245 DeadResourceStatsRecorder m_deadStatsRecorder;
248 bool m_autoLoadImages : 1;
249 bool m_imagesEnabled : 1;
250 bool m_allowStaleResources : 1;
253 class ResourceCacheValidationSuppressor {
254 WTF_MAKE_NONCOPYABLE(ResourceCacheValidationSuppressor);
255 WTF_MAKE_FAST_ALLOCATED;
257 ResourceCacheValidationSuppressor(ResourceFetcher* loader)
259 , m_previousState(false)
262 m_previousState = m_loader->m_allowStaleResources;
263 m_loader->m_allowStaleResources = true;
266 ~ResourceCacheValidationSuppressor()
269 m_loader->m_allowStaleResources = m_previousState;
272 ResourceFetcher* m_loader;
273 bool m_previousState;