如何正确刷新Node.js文件writeStream？

Question

我的问题是我无法确定何时成功写入文件并且文件已关闭.考虑以下情况:

var fs = require('fs');
var outs = fs.createWriteStream('/tmp/file.txt');
var ins = <some input stream>

...
ins.on('data', function(chunk) { out.write(chunk); });
...
ins.on('end', function() {
   outs.end();
   outs.destroySoon();
   fs.stat('/tmp/file.txt', function(err, info) {

      // PROBLEM: Here info.size will not match the actual number of bytes.
      // However if I wait for a few seconds and then call fs.stat the file has been flushed.
   });
});

那么,在访问文件之前,如何强制或以其他方式确保文件已正确刷新？我需要确保文件存在并完成,因为我的代码必须生成一个外部进程来读取和处理文件.

Answer 1

在writeable stream's close事件中进行文件的后处理:

outs.on('close', function() {
  <<spawn your process>>
});

而且,不需要destroySoon之后end,它们是同一个.