node 实现文件夹自动同步

主要功能，

　　监视一个文件夹，当有文件新增，修改，删除时自动同步到指定的文件夹

需要安装的模块

　　npm install chokidar
　　npm install iconv-lite

说明node没有专门的copy文件的方法，这用适合小文件copy的方法，因为是直接copy，读取和写入都是直接二进制。（{encoding:'binary'}）

 

// process.exit();

var fs,path,chokidar,dir1,tra1,tra2,pDir,exec,iconv,allRun=0;
fs = require('fs');  
path= require("path");
chokidar = require('chokidar');
iconv = require('iconv-lite');
// exec = require('child_process').exec;

// youyoue 本地间的文件同步
dir1='G:/webS/www/youyue/web'.replace(/\//g,path.sep);
tra2='G:/webS/www/youyuet/web'.replace(/\//g,path.sep);


watcherBl(dir1,dir1,tra2);
//    npm install iconv-lite
function watcherBl(dir1,tra1,tra2,noSyn){
    var watcher;
    mkdirsSync(tra2, '0777');
    allRun++;
    watcher = chokidar.watch(dir1, {ignored: /[\/\\]\./, persistent: true, });
    watcher.on('ready',function(){
        allRun--;
        if(allRun===0)console.log( "run.." );
        watcher
        .on('add', function(pathD) {

            var path_n=pathD.replace(tra1,tra2);
            mkdirsSync(path.dirname(path_n), '0777');
            copy(pathD,path_n);
            fs.stat(pathD, function(err1, stats) {
                if (err1){  
                    console.log('stat error');
                    return false; 
                }
                fs.utimes(path_n,stats.mtime,stats.mtime,function(err){
                    if(err)console.log('time error'+err);
                });
            });
             
            // console.log( 'add'+'_'+ path);
        })
        .on('addDir', function(path) { 
            var path_n=path.replace(tra1,tra2);
            mkdirsSync(path_n, '0777');
            
            // console.log( 'addDir'+'_'+ path);
        })
        .on('change', function(path) {
            var path_n=path.replace(tra1,tra2);

            setTimeout(function () {
                copy(path,path_n);
                fs.stat(path, function(err1, stats) {
                    if (err1){  
                        console.log('stat error');
                        return false; 
                    }
                    fs.utimes(path_n,stats.mtime,stats.mtime,function(err){
                        if(err)console.log('time error'+err);
                    });
                });
            }, 500);
                 
            // console.log( 'change'+'_'+ path );  
        })
        .on('unlink', function(path) { 
            var path_n,JsonObj;
            if(noSyn){
                path_n=path.replace(tra1,'');
                if(fs.existsSync(pDir+'/file_list.json')){
                    JsonObj=JSON.parse(fs.readFileSync(pDir+'/file_list.json'));
                }else{
                    JsonObj={list:[]};
                }
                JsonObj.list.push(path_n);
                fs.writeFileSync(pDir+'/file_list.json',JSON.stringify(JsonObj));

            }else{
                path_n=path.replace(tra1,tra2);
                fs.unlink(path_n,function(err){if(err)console.log('time error'+err); });
            }
            
            // console.log( 'unlink'+'_'+ path );
        })
        .on('unlinkDir', function(path) { 
            var path_n,JsonObj;
            if(noSyn){
                path_n=path.replace(tra1,'');
                if(fs.existsSync(pDir+'/dir_list.json')){
                    JsonObj=JSON.parse(fs.readFileSync(pDir+'/dir_list.json'));
                }else{
                    JsonObj={list:[]};
                }
                JsonObj.list.push(path_n);
                fs.writeFileSync(pDir+'/dir_list.json',JSON.stringify(JsonObj));

            }else{
                path_n=path.replace(tra1,tra2);
                deleteFolder(path_n);
            }
            
            // console.log( 'unlinkDir'+'_'+ path );
        })
        .on('error', function(error) { console.log('Error happened', error); });

    });
}


/**
 * 创建文件夹 _同步操作
 * @param  {[string]} dirpath  [路径]
 * @param  {[string]}   mode   [权限:'0777']
 * @param  {Function} callback [description]
 * @return {[type]}            [description]
 */
function mkdirsSync(dirpath, mode, callback) {
    callback = callback || function(){};
    if( fs.existsSync(dirpath) ){       
        callback(dirpath);
    }else{  
        mkdirsSync(path.dirname(dirpath), mode, function(){
            fs.mkdirSync(dirpath, mode);
            callback(dirpath);
        });
    }
}
/**
 * 复制小文件 _同步操作
 * @param  {[path]} src [原文件路径]
 * @param  {[path]} dst [要复制到的文件路径]
 * @return {[type]}     [description]
 */
function copy(src, dst ) {

    var con;
    try {
        con=fs.readFileSync(src,{encoding:'binary'}); 
        fs.writeFileSync(dst, con,{encoding:'binary'});
    } catch (ex) {
        console.log( src +'_' + dst+'_'+ex );
    }

    // con=iconv.decode( fs.readFileSync(src), 'utf8'); 
    // fs.writeFileSync(dst, iconv.encode(con, 'gbk'),{encoding:''}); 
         
    // var str='copy "'+src+'" "'+dst+'"';
    // exec(str,function(error,stdout,stderr){if(error!==null){console.log('exec error: ' + error); } });
    
    // try {
    //     fs.writeFileSync(dst, fs.readFileSync(src));
    // } catch (ex) {
    //     console.log( src +'_' + dst );
    // }
}

/**
 * 删除文件夹 _同步操作
 * @param  {[type]} path [description]
 * @return {[type]}      [description]
 */
function deleteFolder(path) {
    var files = [];
    if( fs.existsSync(path) ) {
        files = fs.readdirSync(path);
        files.forEach(function(file,index){
            var curPath = path + "/" + file;
            if(fs.statSync(curPath).isDirectory()) { // recurse
                deleteFolder(curPath);
            } else { // delete file
                fs.unlinkSync(curPath);
            }
        });
        fs.rmdirSync(path);
    }
}