DelayNoMore/frontend/build-templates/wechatgame/libs/wx-fs-utils.js

/****************************************************************************
 Copyright (c) 2017-2019 Xiamen Yaji Software Co., Ltd.

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 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated engine source code (the "Software"), a limited,
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 to use Cocos Creator solely to develop games on your target platforms. You shall
  not use Cocos Creator software for developing other software or tools that's
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  sublicense, and/or sell copies of Cocos Creator.

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 Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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var fs = wx.getFileSystemManager ? wx.getFileSystemManager() : null;

function checkFsValid () {
    if (!fs) {
        console.warn('can not get the file system!');
        return new Error('file system does not exist!');
    }
    return null;
}

function deleteFile (filePath, callback) {
    var result = checkFsValid();
    if (result) return result;
    fs.unlink({
        filePath: filePath,
        success: function () {
            cc.log('Removed local file ' + filePath + ' successfully!');
            callback && callback(null);
        },
        fail: function (res) {
            console.warn(res.errMsg);
            callback && callback(new Error(res.errMsg));
        }
    });
}

function downloadFile (remoteUrl, filePath, callback) {
    var currentDownloadTask = wx.downloadFile({
        url: remoteUrl,
        filePath: filePath,
        success: function (res) {
            if (res.statusCode === 200) {
                callback && callback(null, res.tempFilePath || res.filePath);
            }
            else {
                if (res.filePath) {
                    deleteFile(res.filePath);
                }
                console.warn("Download file failed: " + remoteUrl);
                callback && callback(new Error(res.errMsg), null);
            }
        },
        fail: function (res) {
            if (true == wxDownloader.totalBytesExpectedToWriteAlreadyCounted.has(remoteUrl)) {
              wxDownloader.totalBytesExpectedToWriteForAllTasks -= res.totalBytesExpectedToWrite; 
              const bytesWrittenOfThisRemoteUrl = parseInt(wxDownloader.totalBytesExpectedToWriteAlreadyCounted.get(remoteUrl));
              if (isNaN(bytesWrittenOfThisRemoteUrl)) {
                return;
              }
              wxDownloader.totalBytesWrittenForAllTasks -= bytesWrittenOfThisRemoteUrl;  
              wxDownloader.totalBytesExpectedToWriteAlreadyCounted.delete(remoteUrl);
            }
            console.warn(res.errMsg);
            callback && callback(new Error(res.errMsg), null);
        }
    });

    currentDownloadTask.onProgressUpdate((res) => {
      if (false == wxDownloader.totalBytesExpectedToWriteAlreadyCounted.has(remoteUrl)) {
        wxDownloader.totalBytesExpectedToWriteForAllTasks += res.totalBytesExpectedToWrite; 
        wxDownloader.totalBytesExpectedToWriteAlreadyCounted.set(remoteUrl, 0);
      }
      const bytesWrittenOfThisRemoteUrl = wxDownloader.totalBytesExpectedToWriteAlreadyCounted.get(remoteUrl);  
      if (isNaN(bytesWrittenOfThisRemoteUrl)) {
        return;
      }
      wxDownloader.totalBytesWrittenForAllTasks += (res.totalBytesWritten - bytesWrittenOfThisRemoteUrl); 
      wxDownloader.totalBytesExpectedToWriteAlreadyCounted.set(remoteUrl, res.totalBytesWritten);
    });
}

function saveFile (srcPath, destPath, callback) {
    wx.saveFile({
        tempFilePath: srcPath,
        filePath: destPath,
        success: function (res) {
            cc.log('save file finished:' + destPath);
            callback && callback(null, res.savedFilePath);
        },
        fail: function (res) {
            cc.log('save file failed:' + res.errMsg);
            callback && callback(new Error(res.errMsg), null);
        }
    });
}

function copyFile (srcPath, destPath, callback) {
    var result = checkFsValid();
    if (result) return result;
    fs.copyFile({
        srcPath: srcPath,
        destPath: destPath,
        success: function () {
            cc.log('copy file finished:' + destPath);
            callback && callback(null);
        },
        fail: function (res) {
            cc.log('copy file failed:' + res.errMsg);
            callback && callback(new Error(res.errMsg));
        }
    });
}

function writeFile (path, data, encoding, callback) {
    var result = checkFsValid();
    if (result) return result;
    fs.writeFile({
        filePath: path,
        encoding: encoding,
        data: data,
        success: callback ? function () {
            callback(null);
        } : undefined,
        fail: function (res) {
            console.warn(res.errMsg);
            callback && callback(new Error(res.errMsg));
        }
    });
}

function writeFileSync (path, data, encoding) {
    var result = checkFsValid();
    if (result) return result;
    try {
        fs.writeFileSync(path, data, encoding);
        return null;
    }
    catch (e) {
        console.warn(e.message);
        return new Error(e.message);
    }
}

function readFile (filePath, encoding, callback) {
    var result = checkFsValid();
    if (result) return result;
    fs.readFile({
        filePath: filePath,
        encoding: encoding,
        success: callback ? function (res) {
            callback(null, res.data);
        } : undefined,
        fail: function (res) {
            console.warn(res.errMsg);
            callback && callback (new Error(res.errMsg), null);
        }
    });
}

function readDir (filePath, callback) {
    var result = checkFsValid();
    if (result) {
        return result;
    }
    fs.readdir({
        dirPath: filePath,
        success: callback ? function (res) {
            callback(null, res.files);
        } : undefined,
        fail: callback ? function (res) {
            callback(new Error(res.errMsg), null);
        } : undefined
    });
}

function readText (filePath, callback) {
    return readFile(filePath, 'utf8', callback);
}

function readArrayBuffer (filePath, callback) {
    return readFile(filePath, '', callback);
}

function readJsonSync (path) {
    var result = checkFsValid();
    if (result) return result;
    try {
        var str = fs.readFileSync(path, 'utf8');
        return JSON.parse(str);
    }
    catch (e) {
        console.warn(e.message);
        return new Error(e.message);
    }
}

function makeDirSync (path, recursive) {
    var result = checkFsValid();
    if (result) return result;
    try {
        fs.mkdirSync(path, recursive);
        return null;
    }
    catch (e) {
        console.warn(e.message);
        return new Error(e.message);
    }
}

function exists (filePath, callback) {
    var result = checkFsValid();
    if (result) return result;
    fs.access({
        path: filePath,
        success: callback ? function () {
            callback(true);
        } : undefined,
        fail: callback ? function () {
            callback(false);
        } : undefined,
    });
}

window.wxFsUtils = module.exports = {fs, checkFsValid, readDir, exists, copyFile, downloadFile, readText, readArrayBuffer, saveFile, writeFile, deleteFile, writeFileSync, readJsonSync, makeDirSync};