axmol/cocos/network/CCDownloader.h

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 Copyright (c) 2015-2016 cocos2d-x.org
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#pragma once

#include <functional>
#include <string>
#include <memory>
#include <vector>

#include "platform/CCPlatformMacros.h"

namespace cocos2d { namespace network {

    class IDownloadTask;
    class IDownloaderImpl;
    class Downloader;

    class CC_DLL DownloadTask final
    {
    public:
        const static int ERROR_NO_ERROR = 0;
        const static int ERROR_INVALID_PARAMS = -1;
        const static int ERROR_OPEN_FILE_FAILED = -2;
        const static int ERROR_IMPL_INTERNAL = -3;
        const static int ERROR_TASK_DUPLICATED = -4;
        const static int ERROR_CREATE_DIR_FAILED = -5;
        const static int ERROR_REMOVE_FILE_FAILED = -6;
        const static int ERROR_RENAME_FILE_FAILED = -7;
        const static int ERROR_CHECK_SUM_FAILED = -8;
		const static int ERROR_ORIGIN_FILE_MISSING = -9;

        std::string identifier;
        std::string requestURL;
        std::string storagePath;

        struct {
            // progress
            int64_t  totalBytesExpected = 0;
            int64_t  bytesReceived = 0;
            int64_t  totalBytesReceived = 0;
            // speed
            double   speedInBytes = 0;
        } mutable progressInfo;

        DownloadTask();
        DownloadTask(const std::string& srcUrl, const std::string& identifier);
        DownloadTask(const std::string& srcUrl,
            const std::string& storagePath,
            const std::string& md5checksum,
            const std::string& identifier);

        virtual ~DownloadTask();
        
        // Cancel the download, it's useful for ios platform switch wifi to 4g
        void cancel();

		std::string md5checksum; // For check only when download finished.
		
    private:
        friend class Downloader;
        std::unique_ptr<IDownloadTask> _coTask;
    };

    class CC_DLL DownloaderHints
    {
    public:
        uint32_t countOfMaxProcessingTasks;
        uint32_t timeoutInSeconds;
        std::string tempFileNameSuffix;
    };

    class CC_DLL Downloader final
    {
    public:
        Downloader();
        Downloader(const DownloaderHints& hints);
        ~Downloader();

        std::function<void(const DownloadTask& task,
                           std::vector<unsigned char>& data)> onDataTaskSuccess;

        std::function<void(const DownloadTask& task)> onFileTaskSuccess;

        std::function<void(const DownloadTask& task)> onTaskProgress;

        std::function<void(const DownloadTask& task,
                           int errorCode,
                           int errorCodeInternal,
                           const std::string& errorStr)> onTaskError;
        
        void setOnFileTaskSuccess(const std::function<void(const DownloadTask& task)>& callback) {onFileTaskSuccess = callback;};
        
        void setOnTaskProgress(const std::function<void(const DownloadTask& task)>& callback) {onTaskProgress = callback;};
        
        void setOnTaskError(const std::function<void(const DownloadTask& task,
                                               int errorCode,
                                               int errorCodeInternal,
                                               const std::string& errorStr)>& callback) {onTaskError = callback;};

        std::shared_ptr<DownloadTask> createDownloadDataTask(const std::string& srcUrl, const std::string& identifier = "");

        std::shared_ptr<DownloadTask> createDownloadFileTask(const std::string& srcUrl, const std::string& storagePath, const std::string& md5checksum = "", const std::string& identifier = "");

    private:
        std::unique_ptr<IDownloaderImpl> _impl;
    };

}}  // namespace cocos2d::network