Node.js方法不返回任何响应，待处理请求

Simple upload method using node.js+express.js:

使用node.js + express.js的简单上传方法:

upload: function(req, res, next){
    //go over each uploaded file
    async.each(req.files.upload, function(file, cb) {
        async.auto({
            //create new path and new unique filename
            metadata: function(cb){
                //some code...
               cb(null, {uuid:uuid, newFileName:newFileName, newPath:newPath});
            },
            //read file
            readFile: function(cb, r){
               fs.readFile(file.path, cb);
            },
            //write file to new destination
            writeFile: ['readFile', 'metadata', function(cb,r){
                fs.writeFile(r.metadata.newPath, r.readFile, function(){
                    console.log('finished');
                });   
            }]
        }, function(err, res){
            cb(err, res);
        });
    }, function(err){
        res.json({success:true});
    });

   return;
}

The method iterates each uploaded file, creates a new filename and writes it to a given location set in metadata.

该方法迭代每个上载的文件,创建新文件名并将其写入元数据中设置的给定位置。

console.log('finished');

is fired when writing is finished, however the client never receives a response. After 2 minutes the request is cancled, however the file was uploaded.

写入完成后会被触发,但客户端永远不会收到响应。 2分钟后,请求被预定,但文件已上传。

Any ideas why this method does not return any response?

1 个解决方案

#1

You're using readFile, which is async, too, and works like this:

您正在使用readFile,它也是异步的,并且工作方式如下:

fs.readFile('/path/to/file',function(e,data)
{
    if (e)
    {
        throw e;
    }
    console.log(data);//file contents as Buffer
});

I you could pass a reference to a function here, to take care of this, but IMO, it'd be way easier to simply use readFileSync, which returns the Buffer directly, and can be passed to writeFile without issues:

我可以在这里传递一个函数的引用来处理这个,但IMO,简单地使用readFileSync会更容易,它直接返回Buffer,并且可以毫无问题地传递给writeFile:

fs.writeFile(r.metadata.newPath, r.readFileSync, function(err)
{
    if (err)
    {
        throw err;
    }
    console.log('Finished');
});

Check the docs for readFile and writeFile respectively

分别检查文档的readFile和writeFile

#1