在保存文件（node.js，express）结束之前，busboy-connect连接完成， [英] busboy-connect fires on finish before the end of save file (node.js , express)

问题描述

我使用busboy connect从我的客户端获取上传数据。我尝试保存数据，然后on.finish返回到服务器的状态。问题是on.finish在文件保存结束之前触发。
我做错了什么，或者是模块的工作方式？

服务器端代码：

  console.log（upload started dirname，__dirname）; 
 var fstream; 
 var result = []; 
 var number_of_files = 1; 
 req.pipe（req.busboy）; 
 req.busboy.on（'field'，function（fieldname，val）{
 field_obj = {} 
 field_obj [fieldname] = val; 
 result.push（field_obj） ; 
 console.log（field_obj）
}）; 
 req.busboy.on（'file'，function（fieldname，file，filename）{
 console.log（Uploading：+ filename）; 
 //图像的路径上传
 if（result.length> 0）{
 var file_type = filename.substr（filename.length  -  4）; 
 filename = result [0] .name +'_'+ file_type; 
 number_of_files ++; 
} 
 fstream = fs.createWriteStream（__ dirname +/+ filename）; 
 file.pipe（fstream）; 
 fstream .on（'close'，function（）{
 console.log（Upload Finished of+ filename）; 
 result.push（filename）; 
 console.log（result ，结果）
}）; 
}）; 
 req.busboy.on（'finish'，function（）{
 console.log（form parsing finished）
 console.log（result finish，result）
 res.sendStatus（200）
}）; 
  

我期望结果完成是我看到的最后一个msg，但是我得到以下在我的控制台上：

 上传：testSwf1.swf 
上传：testSwf3.swf 
表单解析完成
结果完成[{name：'123'}，{clickUrl：'234234'}] 
上传已完成123_1.swf 
结果[{name：'123'}，{clickUrl：' 234234'}，'123_1.swf'] 
上传已完成123_2.swf 
结果[{name：'123'}，
 {clickUrl：'234234'}，
 '123_1.swf'，
'123_2.swf'] 
  

编辑
i也试过on.end，但是没有发现任何东西。

  req.busboy .on（'end'，function（）{
 console.log（DONE PARSING FORM）
 console.log（NEW result finish，result）
}）; 
  

解决方案

由于mscdex建议我使用变量来查找写作完成：

  var fstream; 
 var result = []; 
 var number_of_files = 1; 
 var counter = 0; 
 req.pipe（req.busboy）; 
 req.busboy.on（'field'，function（fieldname，val）{
 field_obj = {} 
 field_obj [fieldname] = val; 
 result.push（field_obj） ; 
 console.log（field_obj）
}）; 
 req.busboy.on（'file'，function（fieldname，file，filename）{
 counter ++; 
 console.log（Uploading：+ filename）; 
 / /图像将被上传的路径
 if（result.length> 0）{
 var file_type = filename.substr（filename.length  -  4）; 
 filename = result [0]。 （$ _ $ d $$）; 
 file_type; 
 file_type; 
 file.pipe（fstream） ; 
 fstream.on（'close'，function（）{
 counter_; 
 console.log（Upload Finished+ filename）; 
 result.push（文件名）; 
 console.log（result，result）
 if（counter == 0）{
 console.log（writing finished）; 
 res.sendStatus （200）; 
} 
}）; 
}）; 
  

I use busboy connect to get the upload data from my client. I try to save the data and then on.finish to return status ok to the server. The problem is that the on.finish fires before the end of the file saving. Have I done something wrong or that's the way the module works?

server-side code :

        console.log("upload started dirname ", __dirname);
        var fstream;
        var result = [];
        var number_of_files = 1;
        req.pipe(req.busboy);
        req.busboy.on('field', function(fieldname, val) {
            field_obj = {}
            field_obj[fieldname] = val;
            result.push(field_obj);
            console.log(field_obj)
        });
        req.busboy.on('file', function(fieldname, file, filename) {
            console.log("Uploading: " + filename);
            //Path where image will be uploaded
            if (result.length > 0) {
                var file_type = filename.substr(filename.length - 4);
                filename = result[0].name + '_' + number_of_files + file_type;
                number_of_files++;
            }
            fstream = fs.createWriteStream(__dirname + "/" + filename);
            file.pipe(fstream);
            fstream.on('close', function() {
                console.log("Upload Finished of " + filename);
                result.push(filename);
                console.log("result ",result)
            });
        });
        req.busboy.on('finish', function() {
            console.log("form parsing finished")
            console.log("result finish",result)
            res.sendStatus(200)
        });

I would expect the "result finish" to be the last msg i see , but i get the following on my console:

Uploading: testSwf1.swf
Uploading: testSwf3.swf
form parsing finished
result finish [ { name: '123' }, { clickUrl: '234234' } ]
Upload Finished of 123_1.swf
result  [ { name: '123' }, { clickUrl: '234234' }, '123_1.swf' ]
Upload Finished of 123_2.swf
result  [ { name: '123' },
  { clickUrl: '234234' },
  '123_1.swf',
  '123_2.swf' ]

EDIT i also tried the on.end but that one didn't fired at all.

req.busboy.on('end', function() {
    console.log("DONE PARSING FORM")
    console.log("NEW result finish", result)
});

解决方案

As mscdex suggested I used a variable to find when the writing is finised:

var fstream;
var result = [];
var number_of_files = 1;
var counter = 0; 
req.pipe(req.busboy);
req.busboy.on('field', function(fieldname, val) {
    field_obj = {}
    field_obj[fieldname] = val;
    result.push(field_obj);
    console.log(field_obj)
});
req.busboy.on('file', function(fieldname, file, filename) {
    counter++;
    console.log("Uploading: " + filename);
    //Path where image will be uploaded
    if (result.length > 0) {
        var file_type = filename.substr(filename.length - 4);
        filename = result[0].name + '_' + number_of_files + file_type;
        number_of_files++;
    }
    fstream = fs.createWriteStream(__dirname + "/" + filename);
    file.pipe(fstream);
    fstream.on('close', function() {
        counter--;
        console.log("Upload Finished of " + filename);
        result.push(filename);
        console.log("result ",result)
        if(counter == 0){
            console.log("writing finished");
            res.sendStatus(200);
        }
    });
});

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