connectionmanager.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef BACKENDS_NETWORKING_CURL_CONNECTIONMANAGER_H
#define BACKENDS_NETWORKING_CURL_CONNECTIONMANAGER_H

#include "backends/networking/curl/request.h"
#include "common/str.h"
#include "common/singleton.h"
#include "common/hashmap.h"
#include "common/mutex.h"

typedef void CURL;
typedef void CURLM;
struct curl_slist;

namespace Networking {

class NetworkReadStream;

class ConnectionManager : public Common::Singleton<ConnectionManager> {
    static const uint32 FRAMES_PER_SECOND = 100;
    static const uint32 TIMER_INTERVAL = 1000000 / FRAMES_PER_SECOND;
    static const uint32 CLOUD_PERIOD = 1; //every frame
    static const uint32 CURL_PERIOD = 1; //every frame
    static const uint32 DEBUG_PRINT_PERIOD = FRAMES_PER_SECOND; // once per second

    friend void connectionsThread(void *); //calls handle()

    typedef Common::BaseCallback<Request *> *RequestCallback;

    struct RequestWithCallback {
        Request *request;
        RequestCallback onDeleteCallback;

        RequestWithCallback(Request *rq = nullptr, RequestCallback cb = nullptr): request(rq), onDeleteCallback(cb) {}
    };

    CURLM *_multi;
    bool _timerStarted;
    Common::Array<RequestWithCallback> _requests, _addedRequests;
    Common::Mutex _handleMutex, _addedRequestsMutex;
    uint32 _frame;

    void startTimer(int interval = TIMER_INTERVAL);
    void stopTimer();
    void handle();
    void interateRequests();
    void processTransfers();
    bool hasAddedRequests();

public:
    ConnectionManager();
    ~ConnectionManager() override;

    void registerEasyHandle(CURL *easy) const;

    Request *addRequest(Request *request, RequestCallback callback = nullptr);

    Common::String urlEncode(const Common::String &s) const;

    static uint32 getCloudRequestsPeriodInMicroseconds();

    static Common::String getCaCertPath();
};

#define ConnMan     Networking::ConnectionManager::instance()

} // End of namespace Networking

#endif