LibcurlHTTP2Connection.h

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/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

#ifndef ALEXA_CLIENT_SDK_AVSCOMMON_UTILS_INCLUDE_AVSCOMMON_UTILS_LIBCURLUTILS_LIBCURLHTTP2CONNECTION_H_
#define ALEXA_CLIENT_SDK_AVSCOMMON_UTILS_INCLUDE_AVSCOMMON_UTILS_LIBCURLUTILS_LIBCURLHTTP2CONNECTION_H_

#include <condition_variable>
#include <deque>
#include <map>
#include <memory>
#include <thread>

#include "AVSCommon/Utils/HTTP2/HTTP2ConnectionInterface.h"
#include "CurlMultiHandleWrapper.h"
#include "LibcurlSetCurlOptionsCallbackInterface.h"

namespace alexaClientSDK {
namespace avsCommon {
namespace utils {
namespace libcurlUtils {

class LibcurlHTTP2Request;

class LibcurlHTTP2Connection : public avsCommon::utils::http2::HTTP2ConnectionInterface {
public:
    static std::shared_ptr<LibcurlHTTP2Connection> create(
        const std::shared_ptr<LibcurlSetCurlOptionsCallbackInterface>& setCurlOptionsCallback = nullptr);

    ~LibcurlHTTP2Connection();

    std::shared_ptr<avsCommon::utils::http2::HTTP2RequestInterface> createAndSendRequest(
        const http2::HTTP2RequestConfig& config) override;
    void disconnect() override;
    void addObserver(std::shared_ptr<avsCommon::utils::http2::HTTP2ConnectionObserverInterface> observer) override;
    void removeObserver(std::shared_ptr<avsCommon::utils::http2::HTTP2ConnectionObserverInterface> observer) override;

protected:
    LibcurlHTTP2Connection(
        const std::shared_ptr<LibcurlSetCurlOptionsCallbackInterface>& setCurlOptionsCallback = nullptr);

    using ActiveStreamMap = std::map<CURL*, std::shared_ptr<LibcurlHTTP2Request>>;
    bool addStream(std::shared_ptr<LibcurlHTTP2Request> stream);

    bool createMultiHandle();

    bool releaseStream(ActiveStreamMap::iterator& iterator);

    void networkLoop();

    bool isStopping();

    void setIsStopping();

    void cleanupFinishedStreams();

    void cleanupCancelledAndStalledStreams();

    bool areStreamsPaused();

    void unPauseActiveStreams();

    bool cancelActiveStream(ActiveStreamMap::iterator& iterator);

    void cancelActiveStreams();

    void cancelPendingStreams();

    void cancelAllStreams();

    std::shared_ptr<LibcurlHTTP2Request> dequeueRequest();

    void processNextRequest();

    void notifyObserversOfGoawayReceived();

    std::thread m_networkThread;

    std::shared_ptr<avsCommon::utils::libcurlUtils::CurlMultiHandleWrapper> m_multi;

    std::mutex m_mutex;

    std::condition_variable m_cv;

    ActiveStreamMap m_activeStreams;

    std::deque<std::shared_ptr<LibcurlHTTP2Request>> m_requestQueue;

    std::mutex m_observersMutex;

    std::unordered_set<std::shared_ptr<avsCommon::utils::http2::HTTP2ConnectionObserverInterface>> m_observers;

    bool m_isStopping;

    std::shared_ptr<LibcurlSetCurlOptionsCallbackInterface> m_setCurlOptionsCallback;
};

}  // namespace libcurlUtils
}  // namespace utils
}  // namespace avsCommon
}  // namespace alexaClientSDK

#endif  // ALEXA_CLIENT_SDK_AVSCOMMON_UTILS_INCLUDE_AVSCOMMON_UTILS_LIBCURLUTILS_LIBCURLHTTP2CONNECTION_H_