RedCore/cocos2d/extensions/assets-manager/AssetsManagerEx.h

/****************************************************************************
 Copyright (c) 2013 cocos2d-x.org
 
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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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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/

#ifndef __AssetsManagerEx__
#define __AssetsManagerEx__

#include <string>
#include <unordered_map>
#include <vector>

#include "base/CCEventDispatcher.h"
#include "platform/CCFileUtils.h"
#include "network/CCDownloader.h"

#include "CCEventAssetsManagerEx.h"

#include "Manifest.h"
#include "extensions/ExtensionMacros.h"
#include "extensions/ExtensionExport.h"
#include "json/document-wrapper.h"


NS_CC_EXT_BEGIN

/**
 * @brief   This class is used to auto update resources, such as pictures or scripts.
 */
class CC_EX_DLL AssetsManagerEx : public Ref
{
public:
    
    //! Update states
    enum class State
    {
        UNCHECKED,
        PREDOWNLOAD_VERSION,
        DOWNLOADING_VERSION,
        VERSION_LOADED,
        PREDOWNLOAD_MANIFEST,
        DOWNLOADING_MANIFEST,
        MANIFEST_LOADED,
        NEED_UPDATE,
        UPDATING,
        UNZIPPING,
        UP_TO_DATE,
        FAIL_TO_UPDATE
    };
    
    const static std::string VERSION_ID;
    const static std::string MANIFEST_ID;
    
    /** @brief Create function for creating a new AssetsManagerEx
     @param manifestUrl   The url for the local manifest file
     @param storagePath   The storage path for downloaded assets
     @warning   The cached manifest in your storage path have higher priority and will be searched first,
                only if it doesn't exist, AssetsManagerEx will use the given manifestUrl.
     */
    static AssetsManagerEx* create(const std::string &manifestUrl, const std::string &storagePath);
    
    /** @brief  Check out if there is a new version of manifest.
     *          You may use this method before updating, then let user determine whether
     *          he wants to update resources.
     */
    void checkUpdate();
    
    /** @brief Update with the current local manifest.
     */
    void update();
    
    /** @brief Reupdate all failed assets under the current AssetsManagerEx context
     */
    void downloadFailedAssets();
    
    /** @brief Gets the current update state.
     */
    State getState() const;
    
    /** @brief Gets storage path.
     */
    const std::string& getStoragePath() const;
    
    /** @brief Function for retrieving the local manifest object
     */
    const Manifest* getLocalManifest() const;
    
    /** @brief Function for retrieving the remote manifest object
     */
    const Manifest* getRemoteManifest() const;
    
    /** @brief Function for retrieving the max concurrent task count
     */
    const int getMaxConcurrentTask() const {return _maxConcurrentTask;};
    
    /** @brief Function for setting the max concurrent task count
     */
    void setMaxConcurrentTask(const int max) {_maxConcurrentTask = max;};
    
    /** @brief Set the handle function for comparing manifests versions
     * @param handle    The compare function
     */
    void setVersionCompareHandle(const std::function<int(const std::string& versionA, const std::string& versionB)>& handle) {_versionCompareHandle = handle;};
    
    /** @brief Set the verification function for checking whether downloaded asset is correct, e.g. using md5 verification
     * @param callback  The verify callback function
     */
    void setVerifyCallback(const std::function<bool(const std::string& path, Manifest::Asset asset)>& callback) {_verifyCallback = callback;};
    
CC_CONSTRUCTOR_ACCESS:
    
    AssetsManagerEx(const std::string& manifestUrl, const std::string& storagePath);
    
    virtual ~AssetsManagerEx();
    
protected:
    
    std::string basename(const std::string& path) const;
    
    std::string get(const std::string& key) const;
    
    void initManifests(const std::string& manifestUrl);
    
    void loadLocalManifest(const std::string& manifestUrl);
    
    void prepareLocalManifest();
    
    void setStoragePath(const std::string& storagePath);
    
    void adjustPath(std::string &path);
    
    void dispatchUpdateEvent(EventAssetsManagerEx::EventCode code, const std::string &message = "", const std::string &assetId = "", int curle_code = 0, int curlm_code = 0);
    
    void downloadVersion();
    void parseVersion();
    void downloadManifest();
    void parseManifest();
    void startUpdate();
    void updateSucceed();
    bool decompress(const std::string &filename);
    void decompressDownloadedZip(const std::string &customId, const std::string &storagePath);
    
    /** @brief Update a list of assets under the current AssetsManagerEx context
     */
    void updateAssets(const DownloadUnits& assets);
    
    /** @brief Retrieve all failed assets during the last update
     */
    const DownloadUnits& getFailedAssets() const;
    
    /** @brief Function for destroying the downloaded version file and manifest file
     */
    void destroyDownloadedVersion();
    
    /** @brief Download items in queue with max concurrency setting
     */
    void queueDowload();
    
    void fileError(const std::string& identifier, const std::string& errorStr, int errorCode = 0, int errorCodeInternal = 0);
    
    void fileSuccess(const std::string &customId, const std::string &storagePath);
    
    /** @brief  Call back function for error handling,
     the error will then be reported to user's listener registed in addUpdateEventListener
     @param error   The error object contains ErrorCode, message, asset url, asset key
     @warning AssetsManagerEx internal use only
     * @js NA
     * @lua NA
     */
    virtual void onError(const network::DownloadTask& task,
                         int errorCode,
                         int errorCodeInternal,
                         const std::string& errorStr);
    
    /** @brief  Call back function for recording downloading percent of the current asset,
     the progression will then be reported to user's listener registed in addUpdateProgressEventListener
     @param total       Total size to download for this asset
     @param downloaded  Total size already downloaded for this asset
     @param url         The url of this asset
     @param customId    The key of this asset
     @warning AssetsManagerEx internal use only
     * @js NA
     * @lua NA
     */
    virtual void onProgress(double total, double downloaded, const std::string &url, const std::string &customId);
    
    /** @brief  Call back function for success of the current asset
     the success event will then be send to user's listener registed in addUpdateEventListener
     @param srcUrl      The url of this asset
     @param customId    The key of this asset
     @warning AssetsManagerEx internal use only
     * @js NA
     * @lua NA
     */
    virtual void onSuccess(const std::string &srcUrl, const std::string &storagePath, const std::string &customId);
    
private:
    void batchDownload();

    // Called when one DownloadUnits finished
    void onDownloadUnitsFinished();
    
    //! The event of the current AssetsManagerEx in event dispatcher
    std::string _eventName;
    
    //! Reference to the global event dispatcher
    EventDispatcher *_eventDispatcher;
    //! Reference to the global file utils
    FileUtils *_fileUtils;
    
    //! State of update
    State _updateState;
    
    //! Downloader
    std::shared_ptr<network::Downloader> _downloader;
    
    //! The reference to the local assets
    const std::unordered_map<std::string, Manifest::Asset> *_assets;
    
    //! The path to store successfully downloaded version.
    std::string _storagePath;
    
    //! The path to store downloading version.
    std::string _tempStoragePath;
    
    //! The local path of cached temporary version file
    std::string _tempVersionPath;
    
    //! The local path of cached manifest file
    std::string _cacheManifestPath;
    
    //! The local path of cached temporary manifest file
    std::string _tempManifestPath;
    
    //! The path of local manifest file
    std::string _manifestUrl;
    
    //! Local manifest
    Manifest *_localManifest;
    
    //! Local temporary manifest for download resuming
    Manifest *_tempManifest;
    
    //! Remote manifest
    Manifest *_remoteManifest;
    
    //! Whether user have requested to update
    enum class UpdateEntry : char
    {
        NONE,
        CHECK_UPDATE,
        DO_UPDATE
    };

    UpdateEntry _updateEntry;
    
    //! All assets unit to download
    DownloadUnits _downloadUnits;
    
    //! All failed units
    DownloadUnits _failedUnits;
    
    //! Download queue
    std::vector<std::string> _queue;
    
    //! Max concurrent task count for downloading
    int _maxConcurrentTask;
    
    //! Current concurrent task count
    int _currConcurrentTask;
    
    //! Download percent
    float _percent;
    
    //! Download percent by file
    float _percentByFile;
    
    //! Indicate whether the total size should be enabled
    int _totalEnabled;
    
    //! Indicate the number of file whose total size have been collected
    int _sizeCollected;
    
    //! Total file size need to be downloaded (sum of all file)
    double _totalSize;
    
    //! Downloaded size for each file
    std::unordered_map<std::string, double> _downloadedSize;
    
    //! Total number of assets to download
    int _totalToDownload;
    //! Total number of assets still waiting to be downloaded
    int _totalWaitToDownload;
    //! Next target percent for saving the manifest file
    float _nextSavePoint;
    
    //! Handle function to compare versions between different manifests
    std::function<int(const std::string& versionA, const std::string& versionB)> _versionCompareHandle;
    
    //! Callback function to verify the downloaded assets
    std::function<bool(const std::string& path, Manifest::Asset asset)> _verifyCallback;
    
    //! Marker for whether the assets manager is inited
    bool _inited;
};

NS_CC_EXT_END

#endif /* defined(__AssetsManagerEx__) */