javascript - Nodejs，连接巴士男孩。上传几个文件

Question

通过 Busboy 上传少量文件时，我遇到了事件问题。我的代码:

app.post('/multiupload', function(req, res) {
    var fstream;
    var files = [];
    var busboy = new Busboy({headers: req.headers});
    busboy.on('file', function (fieldname, file, filename) {
        fstream = fs.createWriteStream(__dirname + '/../static/uploaded/' + filename);
        file.pipe(fstream);
        fstream.on('close', function(){
            console.log('file ' + filename + ' uploaded');
            files.push(filename);
        });
    });

    busboy.on('end', function(){console.log('END')});

    busboy.on('finish', function(){
        console.log('finish, files uploaded ', files);
        res.redirect('back');
    });
    req.pipe(busboy);
});

我的表单(Jade 模板)

form(method="POST", action="/multiupload" name="multiupload_form", enctype="multipart/form-data")
input(type='file' name='multifile', multiple)
input(type="submit" value="Upload!")

事件“结束”被忽略，在文件上传过程中完成触发。我哪里错了？

服务器控制台报告:

file 111.gz uploaded
file 222.mp4 uploaded
file 333.jpg uploaded
finish, files uploaded  [ '111.gz', '222.mp4', '333.jpg' ]
file 444 uploaded
file 555.jpg uploaded

Answer 1

busboy 不会发出 end 事件。一旦处理了整个请求并且完全读取了所有file流，就会发出finish事件。所以问题是底层文件描述符的关闭发生在下一个tick(左右)，这是在发出finish之后发生的。

如果您需要知道所有文件描述符何时关闭，那么您需要想出一种方法来跟踪已发出多少 close 事件。