| /* |
| * Copyright (C) 2019 Igalia S.L. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "PrefetchCache.h" |
| |
| #include <WebCore/HTTPHeaderNames.h> |
| |
| namespace WebKit { |
| |
| PrefetchCache::Entry::Entry(WebCore::ResourceResponse&& response, RefPtr<WebCore::SharedBuffer>&& buffer) |
| : response(WTFMove(response)), buffer(WTFMove(buffer)) |
| { |
| } |
| |
| PrefetchCache::Entry::Entry(WebCore::ResourceResponse&& redirectResponse, WebCore::ResourceRequest&& redirectRequest) |
| : response(WTFMove(redirectResponse)), redirectRequest(WTFMove(redirectRequest)) |
| { |
| } |
| |
| PrefetchCache::PrefetchCache() |
| : m_expirationTimer(*this, &PrefetchCache::clearExpiredEntries) |
| { |
| } |
| |
| PrefetchCache::~PrefetchCache() |
| { |
| } |
| |
| void PrefetchCache::clear() |
| { |
| m_expirationTimer.stop(); |
| m_sessionExpirationList.clear(); |
| if (m_sessionPrefetches) |
| m_sessionPrefetches->clear(); |
| } |
| |
| std::unique_ptr<PrefetchCache::Entry> PrefetchCache::take(const URL& url) |
| { |
| auto* resources = m_sessionPrefetches.get(); |
| if (!resources) |
| return nullptr; |
| m_sessionExpirationList.removeAllMatching([&url] (const auto& tuple) { |
| return std::get<0>(tuple) == url; |
| }); |
| return resources->take(url); |
| } |
| |
| static const Seconds expirationTimeout { 5_s }; |
| |
| void PrefetchCache::store(const URL& requestUrl, WebCore::ResourceResponse&& response, RefPtr<WebCore::SharedBuffer>&& buffer) |
| { |
| if (!m_sessionPrefetches) |
| m_sessionPrefetches = makeUnique<PrefetchEntriesMap>(); |
| auto addResult = m_sessionPrefetches->add(requestUrl, makeUnique<PrefetchCache::Entry>(WTFMove(response), WTFMove(buffer))); |
| // Limit prefetches for same url to 1. |
| if (!addResult.isNewEntry) |
| return; |
| m_sessionExpirationList.append(std::make_tuple(requestUrl, WallTime::now())); |
| if (!m_expirationTimer.isActive()) |
| m_expirationTimer.startOneShot(expirationTimeout); |
| } |
| |
| void PrefetchCache::storeRedirect(const URL& requestUrl, WebCore::ResourceResponse&& redirectResponse, WebCore::ResourceRequest&& redirectRequest) |
| { |
| if (!m_sessionPrefetches) |
| m_sessionPrefetches = makeUnique<PrefetchEntriesMap>(); |
| redirectRequest.clearPurpose(); |
| m_sessionPrefetches->set(requestUrl, makeUnique<PrefetchCache::Entry>(WTFMove(redirectResponse), WTFMove(redirectRequest))); |
| m_sessionExpirationList.append(std::make_tuple(requestUrl, WallTime::now())); |
| if (!m_expirationTimer.isActive()) |
| m_expirationTimer.startOneShot(expirationTimeout); |
| } |
| |
| void PrefetchCache::clearExpiredEntries() |
| { |
| auto timeout = WallTime::now(); |
| while (!m_sessionExpirationList.isEmpty()) { |
| auto [requestUrl, timestamp] = m_sessionExpirationList.first(); |
| auto* resources = m_sessionPrefetches.get(); |
| ASSERT(resources); |
| ASSERT(resources->contains(requestUrl)); |
| auto elapsed = timeout - timestamp; |
| if (elapsed > expirationTimeout) { |
| resources->remove(requestUrl); |
| m_sessionExpirationList.removeFirst(); |
| } else { |
| m_expirationTimer.startOneShot(expirationTimeout - elapsed); |
| break; |
| } |
| } |
| } |
| |
| } |