axmol/cocos/network/CCDownloader.h

/****************************************************************************
 Copyright (c) 2015-2016 cocos2d-x.org
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2021 Bytedance Inc.

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 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
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 all copies or substantial portions of the Software.

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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 DownloaderCURL;

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(std::string_view srcUrl, std::string_view identifier);
    DownloadTask(std::string_view srcUrl,
                 std::string_view storagePath,
                 std::string_view checksum,  // currently is MD5
                 std::string_view identifier,
                 bool background);

    virtual ~DownloadTask();

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

    std::string checksum;  // The MD5 checksum for check only when download finished.
    bool background;       // Does the task is background (all callback will invoke on downloader thread)

private:
    friend class Downloader;
    friend class DownloaderCURL;
    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, std::string_view 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, std::string_view errorStr)>&
            callback)
    {
        onTaskError = callback;
    };

    std::shared_ptr<DownloadTask> createDownloadDataTask(std::string_view srcUrl, std::string_view identifier = "");

    std::shared_ptr<DownloadTask> createDownloadFileTask(std::string_view srcUrl,
                                                         std::string_view storagePath,
                                                         std::string_view identifier = "",
                                                         std::string_view checksum   = "",
                                                         bool background               = false);

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

}  // namespace network
}  // namespace cocos2d