/*

* Copyright (C) 2021 Apple Inc. All rights reserved.

*

* 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.

*/

#pragma once

#include <WebCore/LoadSchedulingMode.h>

#include <WebCore/NetworkLoadMetrics.h>

#include <WebCore/PageIdentifier.h>

#include <tuple>

#include <wtf/HashMap.h>

#include <wtf/HashSet.h>

#include <wtf/RefCountedAndCanMakeWeakPtr.h>

#include <wtf/TZoneMalloc.h>

#include <wtf/WeakListHashSet.h>

#include <wtf/WeakPtr.h>

namespace WebCore {

class ResourceError;

}

namespace WebKit {

class NetworkLoad;

class NetworkLoadScheduler : public RefCountedAndCanMakeWeakPtr<NetworkLoadScheduler> {

WTF_MAKE_TZONE_ALLOCATED(NetworkLoadScheduler);

public:

static Ref<NetworkLoadScheduler> create()

{

return adoptRef(*new NetworkLoadScheduler);

}

~NetworkLoadScheduler();

void schedule(NetworkLoad&);

void unschedule(NetworkLoad&, const WebCore::NetworkLoadMetrics* = nullptr);

void startedPreconnectForMainResource(const URL&, const String& userAgent);

void finishedPreconnectForMainResource(const URL&, const String& userAgent, const WebCore::ResourceError&);

void setResourceLoadSchedulingMode(WebCore::PageIdentifier, WebCore::LoadSchedulingMode);

void prioritizeLoads(const Vector<Ref<NetworkLoad>>&);

void clearPageData(WebCore::PageIdentifier);

private:

NetworkLoadScheduler();

void scheduleLoad(NetworkLoad&);

void unscheduleLoad(NetworkLoad&);

void scheduleMainResourceLoad(NetworkLoad&);

void unscheduleMainResourceLoad(NetworkLoad&, const WebCore::NetworkLoadMetrics*);

bool isOriginHTTP1X(const String&);

void updateOriginProtocolInfo(const String&, const String&);

class HostContext;

HostContext* contextForLoad(const NetworkLoad&);

using PageContext = HashMap<String, std::unique_ptr<HostContext>>;

HashMap<WebCore::PageIdentifier, std::unique_ptr<PageContext>> m_pageContexts;

struct PendingMainResourcePreconnectInfo {

unsigned pendingPreconnects {1};

WeakListHashSet<NetworkLoad> pendingLoads;

};

// Maps (protocolHostAndPort, userAgent) => PendingMainResourcePreconnectInfo.

using PendingPreconnectMap = HashMap<std::tuple<String, String>, PendingMainResourcePreconnectInfo>;

PendingPreconnectMap m_pendingMainResourcePreconnects;

void maybePrunePreconnectInfo(PendingPreconnectMap::iterator&);

HashSet<String> m_http1XOrigins;

};

}