节点/Busboy:获取文件大小 [英] Node/Busboy: get file size

问题描述

我使用busboy模块使用下面的coffeeScript代码解析多部分请求.有时问题出在数据"处理程序上，该处理程序针对包含一个文件的请求多次调用.这意味着我需要对每个大小求和以得出整个大小.此外，文件"处理程序中的文件对象似乎不包含大小信息.

I used busboy module to parse multipart request with below coffeeScript code. The problem is, sometimes, on 'data' handler called several times for the request including one file. That means I need to sum to each size to figure the whole size. Besides the file object in the on 'file' handler seems not including size information.

如何在不计算每个部分的情况下获得整体尺寸?

How to get the whole size without calculating each part?

预先感谢-

busboy.on 'file', (fieldname, file, filename, encoding, mimetype) ->
  filename = "#{Meteor.uuid()}.jpg"
  dir = "#{HomeDir()}/data/profile"
  saveTo = path.join dir, filename
  file.pipe fs.createWriteStream saveTo
   files.push
     filename: filename
     path: saveTo
     fileSize: data.length
  file.on 'data', (data) ->
    # this data handler called several times 
    files.push
      filename: filename
      path: saveTo
      fileSize: data.length    
  file.on 'end', ->
    console.log 'file finished'

推荐答案

由于您已经将流传输到文件中，因此需要使用类似

Since you're already piping the stream to a file, you need to use something like stream-meter:

var meter = require('stream-meter');
...
busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
  ...
  var m = meter();
  file.pipe(m).pipe(fs.createWriteStream(saveTo)).on('finish', function() {
    files.push({
      filename : filename,
      path     : saveTo,
      fileSize : m.bytes,
    });
  });
});

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