| /* |
| Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de) |
| Copyright (C) 2001 Dirk Mueller (mueller@kde.org) |
| Copyright (C) 2002 Waldo Bastian (bastian@kde.org) |
| Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved. |
| Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/ |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public License |
| along with this library; see the file COPYING.LIB. If not, write to |
| the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. |
| |
| This class provides all functionality needed for loading images, style sheets and html |
| pages from the web. It has a memory cache for these objects. |
| */ |
| |
| #include "config.h" |
| #include "CachedResourceLoader.h" |
| |
| #include "CachedCSSStyleSheet.h" |
| #include "CachedFont.h" |
| #include "CachedImage.h" |
| #include "CachedResourceRequest.h" |
| #include "CachedScript.h" |
| #include "CachedXSLStyleSheet.h" |
| #include "Console.h" |
| #include "ContentSecurityPolicy.h" |
| #include "DOMWindow.h" |
| #include "Document.h" |
| #include "Frame.h" |
| #include "FrameLoader.h" |
| #include "FrameLoaderClient.h" |
| #include "HTMLElement.h" |
| #include "Logging.h" |
| #include "MemoryCache.h" |
| #include "PingLoader.h" |
| #include "ResourceLoadScheduler.h" |
| #include "SecurityOrigin.h" |
| #include "Settings.h" |
| #include <wtf/UnusedParam.h> |
| #include <wtf/text/CString.h> |
| #include <wtf/text/StringConcatenate.h> |
| |
| #define PRELOAD_DEBUG 0 |
| |
| namespace WebCore { |
| |
| static CachedResource* createResource(CachedResource::Type type, const KURL& url, const String& charset) |
| { |
| switch (type) { |
| case CachedResource::ImageResource: |
| return new CachedImage(url.string()); |
| case CachedResource::CSSStyleSheet: |
| return new CachedCSSStyleSheet(url.string(), charset); |
| case CachedResource::Script: |
| return new CachedScript(url.string(), charset); |
| case CachedResource::FontResource: |
| return new CachedFont(url.string()); |
| #if ENABLE(XSLT) |
| case CachedResource::XSLStyleSheet: |
| return new CachedXSLStyleSheet(url.string()); |
| #endif |
| #if ENABLE(LINK_PREFETCH) |
| case CachedResource::LinkResource: |
| return new CachedResource(url.string(), CachedResource::LinkResource); |
| #endif |
| } |
| ASSERT_NOT_REACHED(); |
| return 0; |
| } |
| |
| CachedResourceLoader::CachedResourceLoader(Document* document) |
| : m_document(document) |
| , m_requestCount(0) |
| , m_loadDoneActionTimer(this, &CachedResourceLoader::loadDoneActionTimerFired) |
| , m_autoLoadImages(true) |
| , m_loadFinishing(false) |
| , m_allowStaleResources(false) |
| #ifdef ANDROID_BLOCK_NETWORK_IMAGE |
| , m_blockNetworkImage(false) |
| #endif |
| { |
| } |
| |
| CachedResourceLoader::~CachedResourceLoader() |
| { |
| m_document = 0; |
| |
| cancelRequests(); |
| clearPreloads(); |
| DocumentResourceMap::iterator end = m_documentResources.end(); |
| for (DocumentResourceMap::iterator it = m_documentResources.begin(); it != end; ++it) |
| it->second->setOwningCachedResourceLoader(0); |
| |
| // Make sure no requests still point to this CachedResourceLoader |
| ASSERT(m_requestCount == 0); |
| } |
| |
| CachedResource* CachedResourceLoader::cachedResource(const String& resourceURL) const |
| { |
| KURL url = m_document->completeURL(resourceURL); |
| return cachedResource(url); |
| } |
| |
| CachedResource* CachedResourceLoader::cachedResource(const KURL& resourceURL) const |
| { |
| KURL url = MemoryCache::removeFragmentIdentifierIfNeeded(resourceURL); |
| return m_documentResources.get(url).get(); |
| } |
| |
| Frame* CachedResourceLoader::frame() const |
| { |
| return m_document ? m_document->frame() : 0; |
| } |
| |
| CachedImage* CachedResourceLoader::requestImage(const String& url) |
| { |
| if (Frame* f = frame()) { |
| Settings* settings = f->settings(); |
| if (!f->loader()->client()->allowImages(!settings || settings->areImagesEnabled())) |
| return 0; |
| |
| if (f->loader()->pageDismissalEventBeingDispatched()) { |
| KURL completeURL = m_document->completeURL(url); |
| if (completeURL.isValid() && canRequest(CachedResource::ImageResource, completeURL)) |
| PingLoader::loadImage(f, completeURL); |
| return 0; |
| } |
| } |
| CachedImage* resource = static_cast<CachedImage*>(requestResource(CachedResource::ImageResource, url, String())); |
| if (resource) { |
| #ifdef ANDROID_BLOCK_NETWORK_IMAGE |
| resource->setAutoLoadWasPreventedBySettings(!autoLoadImages() || shouldBlockNetworkImage(url)); |
| #else |
| resource->setAutoLoadWasPreventedBySettings(!autoLoadImages()); |
| #endif |
| if (autoLoadImages() && resource->stillNeedsLoad()) { |
| #ifdef ANDROID_BLOCK_NETWORK_IMAGE |
| if (shouldBlockNetworkImage(url)) { |
| return resource; |
| } |
| #endif |
| resource->setLoading(true); |
| load(resource, true); |
| } |
| } |
| return resource; |
| } |
| |
| CachedFont* CachedResourceLoader::requestFont(const String& url) |
| { |
| return static_cast<CachedFont*>(requestResource(CachedResource::FontResource, url, String())); |
| } |
| |
| CachedCSSStyleSheet* CachedResourceLoader::requestCSSStyleSheet(const String& url, const String& charset, ResourceLoadPriority priority) |
| { |
| return static_cast<CachedCSSStyleSheet*>(requestResource(CachedResource::CSSStyleSheet, url, charset, priority)); |
| } |
| |
| CachedCSSStyleSheet* CachedResourceLoader::requestUserCSSStyleSheet(const String& requestURL, const String& charset) |
| { |
| KURL url = MemoryCache::removeFragmentIdentifierIfNeeded(KURL(KURL(), requestURL)); |
| |
| if (CachedResource* existing = memoryCache()->resourceForURL(url)) { |
| if (existing->type() == CachedResource::CSSStyleSheet) |
| return static_cast<CachedCSSStyleSheet*>(existing); |
| memoryCache()->remove(existing); |
| } |
| CachedCSSStyleSheet* userSheet = new CachedCSSStyleSheet(url, charset); |
| |
| bool inCache = memoryCache()->add(userSheet); |
| if (!inCache) |
| userSheet->setInCache(true); |
| |
| userSheet->load(this, /*incremental*/ false, SkipSecurityCheck, /*sendResourceLoadCallbacks*/ false); |
| |
| if (!inCache) |
| userSheet->setInCache(false); |
| |
| return userSheet; |
| } |
| |
| CachedScript* CachedResourceLoader::requestScript(const String& url, const String& charset) |
| { |
| return static_cast<CachedScript*>(requestResource(CachedResource::Script, url, charset)); |
| } |
| |
| #if ENABLE(XSLT) |
| CachedXSLStyleSheet* CachedResourceLoader::requestXSLStyleSheet(const String& url) |
| { |
| return static_cast<CachedXSLStyleSheet*>(requestResource(CachedResource::XSLStyleSheet, url, String())); |
| } |
| #endif |
| |
| #if ENABLE(LINK_PREFETCH) |
| CachedResource* CachedResourceLoader::requestLinkResource(const String& url, ResourceLoadPriority priority) |
| { |
| ASSERT(frame()); |
| return requestResource(CachedResource::LinkResource, url, String(), priority); |
| } |
| #endif |
| |
| bool CachedResourceLoader::canRequest(CachedResource::Type type, const KURL& url) |
| { |
| // Some types of resources can be loaded only from the same origin. Other |
| // types of resources, like Images, Scripts, and CSS, can be loaded from |
| // any URL. |
| switch (type) { |
| case CachedResource::ImageResource: |
| case CachedResource::CSSStyleSheet: |
| case CachedResource::Script: |
| case CachedResource::FontResource: |
| #if ENABLE(LINK_PREFETCH) |
| case CachedResource::LinkResource: |
| #endif |
| // These types of resources can be loaded from any origin. |
| // FIXME: Are we sure about CachedResource::FontResource? |
| break; |
| #if ENABLE(XSLT) |
| case CachedResource::XSLStyleSheet: |
| if (!m_document->securityOrigin()->canRequest(url)) { |
| printAccessDeniedMessage(url); |
| return false; |
| } |
| break; |
| #endif |
| } |
| |
| // Given that the load is allowed by the same-origin policy, we should |
| // check whether the load passes the mixed-content policy. |
| // |
| // Note: Currently, we always allow mixed content, but we generate a |
| // callback to the FrameLoaderClient in case the embedder wants to |
| // update any security indicators. |
| // |
| switch (type) { |
| case CachedResource::Script: |
| #if ENABLE(XSLT) |
| case CachedResource::XSLStyleSheet: |
| #endif |
| // These resource can inject script into the current document. |
| if (Frame* f = frame()) |
| f->loader()->checkIfRunInsecureContent(m_document->securityOrigin(), url); |
| break; |
| case CachedResource::ImageResource: |
| case CachedResource::CSSStyleSheet: |
| case CachedResource::FontResource: { |
| // These resources can corrupt only the frame's pixels. |
| if (Frame* f = frame()) { |
| Frame* top = f->tree()->top(); |
| top->loader()->checkIfDisplayInsecureContent(top->document()->securityOrigin(), url); |
| } |
| break; |
| } |
| #if ENABLE(LINK_PREFETCH) |
| case CachedResource::LinkResource: |
| // Prefetch cannot affect the current document. |
| break; |
| #endif |
| } |
| // FIXME: Consider letting the embedder block mixed content loads. |
| |
| switch (type) { |
| case CachedResource::Script: |
| if (!m_document->contentSecurityPolicy()->allowScriptFromSource(url)) |
| return false; |
| break; |
| #if ENABLE(XSLT) |
| case CachedResource::XSLStyleSheet: |
| #endif |
| case CachedResource::CSSStyleSheet: |
| if (!m_document->contentSecurityPolicy()->allowStyleFromSource(url)) |
| return false; |
| break; |
| case CachedResource::ImageResource: |
| if (!m_document->contentSecurityPolicy()->allowImageFromSource(url)) |
| return false; |
| break; |
| case CachedResource::FontResource: { |
| if (!m_document->contentSecurityPolicy()->allowFontFromSource(url)) |
| return false; |
| break; |
| } |
| #if ENABLE(LINK_PREFETCH) |
| case CachedResource::LinkResource: |
| if (!m_document->settings()->linkPrefetchEnabled()) |
| return false; |
| break; |
| #endif |
| } |
| |
| return true; |
| } |
| |
| CachedResource* CachedResourceLoader::requestResource(CachedResource::Type type, const String& resourceURL, const String& charset, ResourceLoadPriority priority, bool forPreload) |
| { |
| KURL url = m_document->completeURL(resourceURL); |
| |
| LOG(ResourceLoading, "CachedResourceLoader::requestResource '%s', charset '%s', priority=%d, forPreload=%u", url.string().latin1().data(), charset.latin1().data(), priority, forPreload); |
| |
| // If only the fragment identifiers differ, it is the same resource. |
| url = MemoryCache::removeFragmentIdentifierIfNeeded(url); |
| |
| if (!url.isValid()) |
| return 0; |
| |
| if (!canRequest(type, url)) |
| return 0; |
| |
| // FIXME: Figure out what is the correct way to merge this security check with the one above. |
| if (!document()->securityOrigin()->canDisplay(url)) { |
| if (!forPreload) |
| FrameLoader::reportLocalLoadFailed(document()->frame(), url.string()); |
| LOG(ResourceLoading, "CachedResourceLoader::requestResource URL was not allowed by SecurityOrigin::canDisplay"); |
| return 0; |
| } |
| |
| if (memoryCache()->disabled()) { |
| DocumentResourceMap::iterator it = m_documentResources.find(url.string()); |
| if (it != m_documentResources.end()) { |
| it->second->setOwningCachedResourceLoader(0); |
| m_documentResources.remove(it); |
| } |
| } |
| |
| // See if we can use an existing resource from the cache. |
| CachedResource* resource = memoryCache()->resourceForURL(url); |
| |
| switch (determineRevalidationPolicy(type, forPreload, resource)) { |
| case Load: |
| resource = loadResource(type, url, charset, priority); |
| break; |
| case Reload: |
| memoryCache()->remove(resource); |
| resource = loadResource(type, url, charset, priority); |
| break; |
| case Revalidate: |
| resource = revalidateResource(resource, priority); |
| break; |
| case Use: |
| memoryCache()->resourceAccessed(resource); |
| notifyLoadedFromMemoryCache(resource); |
| break; |
| } |
| |
| if (!resource) |
| return 0; |
| |
| ASSERT(resource->url() == url.string()); |
| m_documentResources.set(resource->url(), resource); |
| |
| return resource; |
| } |
| |
| CachedResource* CachedResourceLoader::revalidateResource(CachedResource* resource, ResourceLoadPriority priority) |
| { |
| ASSERT(resource); |
| ASSERT(resource->inCache()); |
| ASSERT(!memoryCache()->disabled()); |
| ASSERT(resource->canUseCacheValidator()); |
| ASSERT(!resource->resourceToRevalidate()); |
| |
| // Copy the URL out of the resource to be revalidated in case it gets deleted by the remove() call below. |
| String url = resource->url(); |
| CachedResource* newResource = createResource(resource->type(), KURL(ParsedURLString, url), resource->encoding()); |
| |
| LOG(ResourceLoading, "Resource %p created to revalidate %p", newResource, resource); |
| newResource->setResourceToRevalidate(resource); |
| |
| memoryCache()->remove(resource); |
| memoryCache()->add(newResource); |
| |
| newResource->setLoadPriority(priority); |
| newResource->load(this); |
| |
| m_validatedURLs.add(url); |
| return newResource; |
| } |
| |
| CachedResource* CachedResourceLoader::loadResource(CachedResource::Type type, const KURL& url, const String& charset, ResourceLoadPriority priority) |
| { |
| ASSERT(!memoryCache()->resourceForURL(url)); |
| |
| LOG(ResourceLoading, "Loading CachedResource for '%s'.", url.string().latin1().data()); |
| |
| CachedResource* resource = createResource(type, url, charset); |
| |
| bool inCache = memoryCache()->add(resource); |
| |
| // Pretend the resource is in the cache, to prevent it from being deleted during the load() call. |
| // FIXME: CachedResource should just use normal refcounting instead. |
| if (!inCache) |
| resource->setInCache(true); |
| |
| resource->setLoadPriority(priority); |
| resource->load(this); |
| |
| if (!inCache) { |
| resource->setOwningCachedResourceLoader(this); |
| resource->setInCache(false); |
| } |
| |
| // We don't support immediate loads, but we do support immediate failure. |
| if (resource->errorOccurred()) { |
| if (inCache) |
| memoryCache()->remove(resource); |
| else |
| delete resource; |
| return 0; |
| } |
| |
| m_validatedURLs.add(url.string()); |
| return resource; |
| } |
| |
| CachedResourceLoader::RevalidationPolicy CachedResourceLoader::determineRevalidationPolicy(CachedResource::Type type, bool forPreload, CachedResource* existingResource) const |
| { |
| if (!existingResource) |
| return Load; |
| |
| // We already have a preload going for this URL. |
| if (forPreload && existingResource->isPreloaded()) |
| return Use; |
| |
| // If the same URL has been loaded as a different type, we need to reload. |
| if (existingResource->type() != type) { |
| LOG(ResourceLoading, "CachedResourceLoader::determineRevalidationPolicy reloading due to type mismatch."); |
| return Reload; |
| } |
| |
| // Don't reload resources while pasting. |
| if (m_allowStaleResources) |
| return Use; |
| |
| // Alwaus use preloads. |
| if (existingResource->isPreloaded()) |
| return Use; |
| |
| // CachePolicyHistoryBuffer uses the cache no matter what. |
| if (cachePolicy() == CachePolicyHistoryBuffer) |
| return Use; |
| |
| // Don't reuse resources with Cache-control: no-store. |
| if (existingResource->response().cacheControlContainsNoStore()) { |
| LOG(ResourceLoading, "CachedResourceLoader::determineRevalidationPolicy reloading due to Cache-control: no-store."); |
| return Reload; |
| } |
| |
| // Avoid loading the same resource multiple times for a single document, even if the cache policies would tell us to. |
| if (m_validatedURLs.contains(existingResource->url())) |
| return Use; |
| |
| // CachePolicyReload always reloads |
| if (cachePolicy() == CachePolicyReload) { |
| LOG(ResourceLoading, "CachedResourceLoader::determineRevalidationPolicy reloading due to CachePolicyReload."); |
| return Reload; |
| } |
| |
| // We'll try to reload the resource if it failed last time. |
| if (existingResource->errorOccurred()) { |
| LOG(ResourceLoading, "CachedResourceLoader::determineRevalidationPolicye reloading due to resource being in the error state"); |
| return Reload; |
| } |
| |
| // For resources that are not yet loaded we ignore the cache policy. |
| if (existingResource->isLoading()) |
| return Use; |
| |
| // Check if the cache headers requires us to revalidate (cache expiration for example). |
| if (existingResource->mustRevalidateDueToCacheHeaders(cachePolicy())) { |
| // See if the resource has usable ETag or Last-modified headers. |
| if (existingResource->canUseCacheValidator()) |
| return Revalidate; |
| |
| // No, must reload. |
| LOG(ResourceLoading, "CachedResourceLoader::determineRevalidationPolicy reloading due to missing cache validators."); |
| return Reload; |
| } |
| |
| return Use; |
| } |
| |
| void CachedResourceLoader::printAccessDeniedMessage(const KURL& url) const |
| { |
| if (url.isNull()) |
| return; |
| |
| if (!frame()) |
| return; |
| |
| Settings* settings = frame()->settings(); |
| if (!settings || settings->privateBrowsingEnabled()) |
| return; |
| |
| String message = m_document->url().isNull() ? |
| makeString("Unsafe attempt to load URL ", url.string(), '.') : |
| makeString("Unsafe attempt to load URL ", url.string(), " from frame with URL ", m_document->url().string(), ". Domains, protocols and ports must match.\n"); |
| |
| // FIXME: provide a real line number and source URL. |
| frame()->domWindow()->console()->addMessage(OtherMessageSource, LogMessageType, ErrorMessageLevel, message, 1, String()); |
| } |
| |
| void CachedResourceLoader::setAutoLoadImages(bool enable) |
| { |
| if (enable == m_autoLoadImages) |
| return; |
| |
| m_autoLoadImages = enable; |
| |
| if (!m_autoLoadImages) |
| return; |
| |
| DocumentResourceMap::iterator end = m_documentResources.end(); |
| for (DocumentResourceMap::iterator it = m_documentResources.begin(); it != end; ++it) { |
| CachedResource* resource = it->second.get(); |
| if (resource->type() == CachedResource::ImageResource) { |
| CachedImage* image = const_cast<CachedImage*>(static_cast<const CachedImage*>(resource)); |
| #ifdef ANDROID_BLOCK_NETWORK_IMAGE |
| if (shouldBlockNetworkImage(image->url())) |
| continue; |
| #endif |
| image->setAutoLoadWasPreventedBySettings(false); |
| |
| if (image->stillNeedsLoad()) { |
| image->setLoading(true); |
| load(image, true); |
| } |
| } |
| } |
| } |
| |
| #ifdef ANDROID_BLOCK_NETWORK_IMAGE |
| bool CachedResourceLoader::shouldBlockNetworkImage(const String& url) const |
| { |
| if (!m_blockNetworkImage) |
| return false; |
| |
| KURL kurl = m_document->completeURL(url); |
| if (kurl.protocolIs("http") || kurl.protocolIs("https")) |
| return true; |
| return false; |
| } |
| |
| void CachedResourceLoader::setBlockNetworkImage(bool block) |
| { |
| if (block == m_blockNetworkImage) |
| return; |
| |
| m_blockNetworkImage = block; |
| |
| if (!m_autoLoadImages || m_blockNetworkImage) |
| return; |
| |
| DocumentResourceMap::iterator end = m_documentResources.end(); |
| for (DocumentResourceMap::iterator it = m_documentResources.begin(); it != end; ++it) { |
| CachedResource* resource = it->second.get(); |
| if (resource->type() == CachedResource::ImageResource) { |
| CachedImage* image = const_cast<CachedImage*>(static_cast<const CachedImage*>(resource)); |
| image->setAutoLoadWasPreventedBySettings(false); |
| if (image->stillNeedsLoad()) { |
| image->setLoading(true); |
| load(image, true); |
| } |
| } |
| } |
| } |
| #endif |
| |
| CachePolicy CachedResourceLoader::cachePolicy() const |
| { |
| return frame() ? frame()->loader()->subresourceCachePolicy() : CachePolicyVerify; |
| } |
| |
| void CachedResourceLoader::removeCachedResource(CachedResource* resource) const |
| { |
| #ifndef NDEBUG |
| DocumentResourceMap::iterator it = m_documentResources.find(resource->url()); |
| if (it != m_documentResources.end()) |
| ASSERT(it->second.get() == resource); |
| #endif |
| m_documentResources.remove(resource->url()); |
| } |
| |
| void CachedResourceLoader::load(CachedResource* resource, bool incremental, SecurityCheckPolicy securityCheck, bool sendResourceLoadCallbacks) |
| { |
| incrementRequestCount(resource); |
| |
| RefPtr<CachedResourceRequest> request = CachedResourceRequest::load(this, resource, incremental, securityCheck, sendResourceLoadCallbacks); |
| if (request) |
| m_requests.add(request); |
| } |
| |
| void CachedResourceLoader::loadDone(CachedResourceRequest* request) |
| { |
| m_loadFinishing = false; |
| RefPtr<CachedResourceRequest> protect(request); |
| if (request) |
| m_requests.remove(request); |
| if (frame()) |
| frame()->loader()->loadDone(); |
| |
| if (!request) { |
| // If the request passed to this function is null, loadDone finished synchronously from when |
| // the load was started, so we want to kick off our next set of loads (via checkForPendingPreloads |
| // and servePendingRequests) asynchronously. |
| m_loadDoneActionTimer.startOneShot(0); |
| return; |
| } |
| |
| performPostLoadActions(); |
| } |
| |
| void CachedResourceLoader::loadDoneActionTimerFired(Timer<CachedResourceLoader>*) |
| { |
| performPostLoadActions(); |
| } |
| |
| void CachedResourceLoader::performPostLoadActions() |
| { |
| checkForPendingPreloads(); |
| resourceLoadScheduler()->servePendingRequests(); |
| } |
| |
| void CachedResourceLoader::cancelRequests() |
| { |
| clearPendingPreloads(); |
| Vector<CachedResourceRequest*, 256> requestsToCancel; |
| RequestSet::iterator end = m_requests.end(); |
| for (RequestSet::iterator i = m_requests.begin(); i != end; ++i) |
| requestsToCancel.append((*i).get()); |
| |
| for (unsigned i = 0; i < requestsToCancel.size(); ++i) |
| requestsToCancel[i]->didFail(true); |
| } |
| |
| void CachedResourceLoader::notifyLoadedFromMemoryCache(CachedResource* resource) |
| { |
| if (!resource || !frame() || resource->status() != CachedResource::Cached) |
| return; |
| |
| // FIXME: If the WebKit client changes or cancels the request, WebCore does not respect this and continues the load. |
| frame()->loader()->loadedResourceFromMemoryCache(resource); |
| } |
| |
| void CachedResourceLoader::incrementRequestCount(const CachedResource* res) |
| { |
| if (res->isLinkResource()) |
| return; |
| |
| ++m_requestCount; |
| } |
| |
| void CachedResourceLoader::decrementRequestCount(const CachedResource* res) |
| { |
| if (res->isLinkResource()) |
| return; |
| |
| --m_requestCount; |
| ASSERT(m_requestCount > -1); |
| } |
| |
| int CachedResourceLoader::requestCount() |
| { |
| if (m_loadFinishing) |
| return m_requestCount + 1; |
| return m_requestCount; |
| } |
| |
| void CachedResourceLoader::preload(CachedResource::Type type, const String& url, const String& charset, bool referencedFromBody) |
| { |
| // FIXME: Rip this out when we are sure it is no longer necessary (even for mobile). |
| UNUSED_PARAM(referencedFromBody); |
| |
| bool hasRendering = m_document->body() && m_document->body()->renderer(); |
| bool canBlockParser = type == CachedResource::Script || type == CachedResource::CSSStyleSheet; |
| if (!hasRendering && !canBlockParser) { |
| // Don't preload subresources that can't block the parser before we have something to draw. |
| // This helps prevent preloads from delaying first display when bandwidth is limited. |
| PendingPreload pendingPreload = { type, url, charset }; |
| m_pendingPreloads.append(pendingPreload); |
| return; |
| } |
| requestPreload(type, url, charset); |
| } |
| |
| void CachedResourceLoader::checkForPendingPreloads() |
| { |
| if (m_pendingPreloads.isEmpty() || !m_document->body() || !m_document->body()->renderer()) |
| return; |
| while (!m_pendingPreloads.isEmpty()) { |
| PendingPreload preload = m_pendingPreloads.takeFirst(); |
| // Don't request preload if the resource already loaded normally (this will result in double load if the page is being reloaded with cached results ignored). |
| if (!cachedResource(m_document->completeURL(preload.m_url))) |
| requestPreload(preload.m_type, preload.m_url, preload.m_charset); |
| } |
| m_pendingPreloads.clear(); |
| } |
| |
| void CachedResourceLoader::requestPreload(CachedResource::Type type, const String& url, const String& charset) |
| { |
| String encoding; |
| if (type == CachedResource::Script || type == CachedResource::CSSStyleSheet) |
| encoding = charset.isEmpty() ? m_document->charset() : charset; |
| |
| CachedResource* resource = requestResource(type, url, encoding, ResourceLoadPriorityUnresolved, true); |
| if (!resource || (m_preloads && m_preloads->contains(resource))) |
| return; |
| resource->increasePreloadCount(); |
| |
| if (!m_preloads) |
| m_preloads = adoptPtr(new ListHashSet<CachedResource*>); |
| m_preloads->add(resource); |
| |
| #if PRELOAD_DEBUG |
| printf("PRELOADING %s\n", resource->url().latin1().data()); |
| #endif |
| } |
| |
| void CachedResourceLoader::clearPreloads() |
| { |
| #if PRELOAD_DEBUG |
| printPreloadStats(); |
| #endif |
| if (!m_preloads) |
| return; |
| |
| ListHashSet<CachedResource*>::iterator end = m_preloads->end(); |
| for (ListHashSet<CachedResource*>::iterator it = m_preloads->begin(); it != end; ++it) { |
| CachedResource* res = *it; |
| res->decreasePreloadCount(); |
| if (res->canDelete() && !res->inCache()) |
| delete res; |
| else if (res->preloadResult() == CachedResource::PreloadNotReferenced) |
| memoryCache()->remove(res); |
| } |
| m_preloads.clear(); |
| } |
| |
| void CachedResourceLoader::clearPendingPreloads() |
| { |
| m_pendingPreloads.clear(); |
| } |
| |
| #if PRELOAD_DEBUG |
| void CachedResourceLoader::printPreloadStats() |
| { |
| unsigned scripts = 0; |
| unsigned scriptMisses = 0; |
| unsigned stylesheets = 0; |
| unsigned stylesheetMisses = 0; |
| unsigned images = 0; |
| unsigned imageMisses = 0; |
| ListHashSet<CachedResource*>::iterator end = m_preloads.end(); |
| for (ListHashSet<CachedResource*>::iterator it = m_preloads.begin(); it != end; ++it) { |
| CachedResource* res = *it; |
| if (res->preloadResult() == CachedResource::PreloadNotReferenced) |
| printf("!! UNREFERENCED PRELOAD %s\n", res->url().latin1().data()); |
| else if (res->preloadResult() == CachedResource::PreloadReferencedWhileComplete) |
| printf("HIT COMPLETE PRELOAD %s\n", res->url().latin1().data()); |
| else if (res->preloadResult() == CachedResource::PreloadReferencedWhileLoading) |
| printf("HIT LOADING PRELOAD %s\n", res->url().latin1().data()); |
| |
| if (res->type() == CachedResource::Script) { |
| scripts++; |
| if (res->preloadResult() < CachedResource::PreloadReferencedWhileLoading) |
| scriptMisses++; |
| } else if (res->type() == CachedResource::CSSStyleSheet) { |
| stylesheets++; |
| if (res->preloadResult() < CachedResource::PreloadReferencedWhileLoading) |
| stylesheetMisses++; |
| } else { |
| images++; |
| if (res->preloadResult() < CachedResource::PreloadReferencedWhileLoading) |
| imageMisses++; |
| } |
| |
| if (res->errorOccurred()) |
| memoryCache()->remove(res); |
| |
| res->decreasePreloadCount(); |
| } |
| m_preloads.clear(); |
| |
| if (scripts) |
| printf("SCRIPTS: %d (%d hits, hit rate %d%%)\n", scripts, scripts - scriptMisses, (scripts - scriptMisses) * 100 / scripts); |
| if (stylesheets) |
| printf("STYLESHEETS: %d (%d hits, hit rate %d%%)\n", stylesheets, stylesheets - stylesheetMisses, (stylesheets - stylesheetMisses) * 100 / stylesheets); |
| if (images) |
| printf("IMAGES: %d (%d hits, hit rate %d%%)\n", images, images - imageMisses, (images - imageMisses) * 100 / images); |
| } |
| #endif |
| |
| } |
