节点 (express.js) next() 在流结束之前被调用

Question

我有如下中间件功能

var bodyParser = require('body-parser'),
  fs = require('fs');
module.exports = function(req, res, next) {
  // Add paths to this array to allow binary uploads
  var pathsAllowingBinaryBody = [
    '/api2/information/upload',
    '/api2/kpi/upload',
  ];

  if (pathsAllowingBinaryBody.indexOf(req._parsedUrl.pathname) !== -1) {
    var date = new Date();
    req.filePath = "uploads/" + date.getTime() + "_" + date.getMilliseconds() + "_" + Math.floor(Math.random() * 1000000000) + "_" + parseInt(req.headers['content-length']);

    var writeStream = fs.createWriteStream(req.filePath);
    req.on('data', function(chunk) {
      writeStream.write(chunk);
    });
    req.on('end', function() {
      writeStream.end();
      next();
    });
  } else {
    bodyParser.json()(req, res, next);
  }
};

文件正在正确传输，但遗憾的是

中的 next()

req.on('end', function() {
  writeStream.end();
  next();
});

在将所有数据写入新文件之前调用。

我的问题是我做错了什么？我该如何解决？

Answer 1

使用可写文件流的 close 事件来了解文件描述符何时关闭。

替换为：

var writeStream = fs.createWriteStream(req.filePath);
req.on('data', function(chunk) {
    writeStream.write(chunk);
});
req.on('end', function() {
    writeStream.end();
    next();
});

有了这个：

req.pipe(fs.createWriteStream(req.filePath)).on('close', next);

节点 (express.js) next() 在流结束之前被调用

Node (express.js) next() is called before end of stream

javascript

fs

node.js

express