axmol/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,
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 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.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 assetes
     @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 retrieve the local manifest object
     */
    const Manifest* getLocalManifest() const;
    
    /** @brief Function for retrieve the remote manifest object
     */
    const Manifest* getRemoteManifest() const;
    
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();
    
    /** @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  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();
    
    //! 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 downloaded resources.
    std::string _storagePath;
    
    //! The local path of cached version file
    std::string _cacheVersionPath;
    
    //! 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
    bool _waitToUpdate;
    
    //! All assets unit to download
    DownloadUnits _downloadUnits;
    
    //! All failed units
    DownloadUnits _failedUnits;
    
    //! All files to be decompressed
    std::vector<std::string> _compressedFiles;
    
    //! 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;
    
    //! Marker for whether the assets manager is inited
    bool _inited;
};

NS_CC_EXT_END

#endif /* defined(__AssetsManagerEx__) */