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* Copyright (C) 2019 Igalia S.L.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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#include "AsyncRevalidation.h"
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#if ENABLE(NETWORK_CACHE_STALE_WHILE_REVALIDATE)
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#include <WebCore/CacheValidation.h>
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#include <WebCore/ResourceRequest.h>
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namespace NetworkCache {
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static inline WebCore::ResourceRequest constructRevalidationRequest(const Key& key, const WebCore::ResourceRequest& request, const Entry& entry)
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WebCore::ResourceRequest revalidationRequest = request;
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if (!key.partition().isEmpty())
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revalidationRequest.setCachePartition(key.partition());
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ASSERT_WITH_MESSAGE(key.range().isEmpty(), "range is not supported");
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revalidationRequest.makeUnconditional();
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auto eTag = entry.response().httpHeaderField(WebCore::HTTPHeaderName::ETag);
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revalidationRequest.setHTTPHeaderField(WebCore::HTTPHeaderName::IfNoneMatch, eTag);
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auto lastModified = entry.response().httpHeaderField(WebCore::HTTPHeaderName::LastModified);
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if (!lastModified.isEmpty())
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revalidationRequest.setHTTPHeaderField(WebCore::HTTPHeaderName::IfModifiedSince, lastModified);
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revalidationRequest.setPriority(WebCore::ResourceLoadPriority::Low);
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return revalidationRequest;
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void AsyncRevalidation::staleWhileRevalidateEnding()
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if (m_completionHandler)
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m_completionHandler(Result::Timeout);
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AsyncRevalidation::AsyncRevalidation(Cache& cache, const GlobalFrameID& frameID, const WebCore::ResourceRequest& request, std::unique_ptr<NetworkCache::Entry>&& entry, CompletionHandler<void(Result)>&& handler)
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: m_timer(*this, &AsyncRevalidation::staleWhileRevalidateEnding)
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, m_completionHandler(WTFMove(handler))
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auto key = entry->key();
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auto revalidationRequest = constructRevalidationRequest(key, request, *entry.get());
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auto age = WebCore::computeCurrentAge(entry->response(), entry->timeStamp());
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auto lifetime = WebCore::computeFreshnessLifetimeForHTTPFamily(entry->response(), entry->timeStamp());
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auto responseMaxStaleness = entry->response().cacheControlStaleWhileRevalidate();
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ASSERT(responseMaxStaleness);
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m_timer.startOneShot(*responseMaxStaleness + (lifetime - age));
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m_load = makeUnique<SpeculativeLoad>(cache, frameID, WTFMove(revalidationRequest), WTFMove(entry), [this, key, revalidationRequest](auto&& revalidatedEntry) {
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ASSERT(!revalidatedEntry || !revalidatedEntry->needsValidation());
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ASSERT(!revalidatedEntry || revalidatedEntry->key() == key);
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if (m_completionHandler)
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m_completionHandler(revalidatedEntry ? Result::Success : Result::Failure);
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} // namespace NetworkCache
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#endif // ENABLE(NETWORK_CACHE_STALE_WHILE_REVALIDATE)