在Node中检测writeStream的结尾 [英] Detecting the end of a writeStream in Node

问题描述

这就是我所拥有的，并且我不断收到错误消息，因为当我按顺序执行该文件时，该文件尚不存在.

This is what I've got, and I keep getting an error because the file doesn't exist yet when I just do it sequentially.

如何在writeStream关闭时触发动作?

How can I trigger an action upon the writeStream getting closed?

var fs = require('fs'), http = require('http');
http.createServer(function(req){
    req.pipe(fs.createWriteStream('file'));


    /* i need to read the file back, like this or something: 
        var fcontents = fs.readFileSync(file);
        doSomethinWith(fcontents);
    ... the problem is that the file hasn't been created yet.
    */

}).listen(1337, '127.0.0.1');

推荐答案

可写流具有 finish 刷新数据时发出的事件.

Writable streams have a finish event that is emitted when the data is flushed.

尝试以下操作；

var fs = require('fs'), http = require('http');

http.createServer(function(req, res){
    var f = fs.createWriteStream('file');

    f.on('finish', function() {
        // do stuff
        res.writeHead(200);
        res.end('done');
    });

    req.pipe(f);
}).listen(1337, '127.0.0.1');

尽管我不会重新读取文件.您可以使用通过来创建流处理器.

Though I wouldnt re-read the file. You can use through to create a stream processor.

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