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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/back_forward_cache_commit_deferring_condition.h"
#include "base/memory/ptr_util.h"
#include "content/browser/renderer_host/back_forward_cache_impl.h"
#include "content/browser/renderer_host/frame_tree_node.h"
#include "content/browser/renderer_host/navigation_request.h"
#include "content/browser/renderer_host/navigator.h"
namespace content {
// static
std::unique_ptr<CommitDeferringCondition>
BackForwardCacheCommitDeferringCondition::MaybeCreate(
NavigationRequest& navigation_request) {
if (!navigation_request.IsServedFromBackForwardCache())
return nullptr;
// Currently only navigations in the primary main frame can restore pages
// from BFCache.
DCHECK(navigation_request.IsInPrimaryMainFrame());
return base::WrapUnique(
new BackForwardCacheCommitDeferringCondition(navigation_request));
}
BackForwardCacheCommitDeferringCondition::
BackForwardCacheCommitDeferringCondition(
NavigationRequest& navigation_request)
: CommitDeferringCondition(navigation_request) {}
BackForwardCacheCommitDeferringCondition::
~BackForwardCacheCommitDeferringCondition() = default;
CommitDeferringCondition::Result
BackForwardCacheCommitDeferringCondition::WillCommitNavigation(
base::OnceClosure resume) {
DCHECK(GetNavigationHandle().IsServedFromBackForwardCache());
BackForwardCacheImpl& bfcache =
NavigationRequest::From(&GetNavigationHandle())
->frame_tree_node()
->navigator()
.controller()
.GetBackForwardCache();
// If an entry doesn't exist (it was evicted?) there's no need to defer the
// commit as we'll end up performing a new navigation.
auto bfcache_entry = bfcache.GetOrEvictEntry(
NavigationRequest::From(&GetNavigationHandle())->nav_entry_id());
if (!bfcache_entry.has_value()) {
CHECK_EQ(bfcache_entry.error(),
BackForwardCacheImpl::kEntryIneligibleAndEvicted);
// If the BFCache entry has just been evicted, it will reset the
// associated `NavigationRequest` and restart a new one. The commit
// process should not be continued.
// DO NOT ADD CODE after this. The previous call to `GetOrEvictEntry()` has
// destroyed the NavigationRequest.
return Result::kCancelled;
}
bfcache.WillCommitNavigationToCachedEntry(*(bfcache_entry.value()),
std::move(resume));
return Result::kDefer;
}
const char* BackForwardCacheCommitDeferringCondition::TraceEventName() const {
return "BackForwardCacheCommitDeferringCondition";
}
} // namespace content
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